CN211082858U

CN211082858U - Proportional valve and breathing machine

Info

Publication number: CN211082858U
Application number: CN201922004377.5U
Authority: CN
Inventors: 史源; 李增; 肖瑞柳
Original assignee: Shenzhen Comen Medical Instruments Co Ltd
Current assignee: Shenzhen Comen Medical Instruments Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-07-24
Anticipated expiration: 2029-11-19
Also published as: WO2021098192A1

Abstract

The utility model provides a proportional valve reaches breathing machine including this proportional valve, proportional valve include valve body, case and drive assembly, and the valve body is equipped with the cavity of air inlet, gas outlet and intercommunication air inlet and gas outlet, and in the cavity was located to the case, drive assembly can support and hold the case in the valve body inner wall with the lid air inlet, and can drive the case and keep away from the valve body inner wall with intercommunication air inlet and gas outlet, case and the rigid contact of valve body inner wall. The flow of the proportional valve can be controlled by controlling the movement of the valve core through the driving assembly, and the air inlet is covered and sealed in a hard sealing mode, so that the contact part of the valve core and the inner wall of the valve body cannot generate elastic deformation in a larger gas pressure range, and particularly, when the gas pressure is larger and the gas flow is smaller, the phenomenon of low gas flow control precision due to the elastic deformation of the valve core cannot occur, so that the control precision of the proportional valve is optimized, and the hard sealing mode is also favorable for improving the response speed of the proportional valve.

Description

Proportional valve and breathing machine

Technical Field

The utility model belongs to the technical field of medical instrument, more specifically say, relate to a proportional valve and breathing machine.

Background

In modern clinical medicine, a ventilator has been widely applied to respiratory failure due to various reasons, anesthesia and breathing management during major surgery, respiratory support therapy and emergency resuscitation as an effective means capable of manually replacing the function of spontaneous ventilation, and has a very important position in the modern medical field.

During use of a ventilator, which has its own compressor, turbine or other type of element to provide a source of gas, the ventilator must be mechanically ventilated and therefore requires a valve for gas flow control that allows proportional control of the flow. However, in the existing breathing machine, due to poor design rationality of the proportional valve, the proportional valve cannot accurately control a small flow range under a large pressure, and therefore the overall performance of the breathing machine is affected.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a proportional valve to solve present proportional valve to the not good enough technical problem of control accuracy of less flow scope under great pressure.

In order to achieve the above object, the utility model adopts the following technical scheme: the valve body is provided with an air inlet, an air outlet and a cavity communicated with the air inlet and the air outlet, the valve core is arranged in the cavity, the driving assembly can support the valve core on the inner wall of the valve body to cover the air inlet and drive the valve core to be away from the inner wall of the valve body to be communicated with the air inlet and the air outlet, and the valve core is in rigid contact with the inner wall of the valve body.

Furthermore, the driving assembly comprises an elastic part and a propping part which are positioned in the cavity, two opposite ends of the elastic part respectively prop against one end of the propping part and the valve body, and the other end of the propping part props against the valve core.

Furthermore, the valve core comprises a core body and a gasket, and the gasket is fixedly arranged on the core body; the gasket is provided with a first arc surface, the abutting piece comprises a ball head part, and the elastic piece drives the ball head part to abut against the first arc surface so as to abut against the core body on the inner wall of the valve body.

Furthermore, the driving assembly further comprises a power element which is connected with the abutting piece and can drive the abutting piece to be far away from the valve core, and a clamping piece which is connected with the valve core, and the abutting piece is abutted with the clamping piece.

Furthermore, the clamping piece is provided with a through groove, the abutting piece comprises a ball head portion and a connecting rod, one end of the connecting rod is connected to the power element, the other end of the connecting rod penetrates through the through groove to be connected with the ball head portion, the clamping piece is further provided with a second arc surface surrounding the through groove, and the ball head portion abuts against the second arc surface.

Furthermore, the abutting part also comprises a bracket connected with the connecting rod, and two opposite ends of the elastic part respectively abut against the bracket and the valve body.

Further, the power element is a voice coil motor, the voice coil motor comprises a motor body and a motion rod, one end of the motion rod is movably connected with the motor body, and the other end of the motion rod is fixedly connected with the abutting piece.

Further, the proportional valve also comprises an air flow buffering head which is connected with the valve core and is positioned in the air inlet; the cross-sectional area of the airflow buffering head perpendicular to the air inlet direction is gradually increased along the air inlet direction, and the air inlet direction is the direction from the air inlet to the cavity.

Furthermore, the valve body comprises a valve body provided with the cavity, the air inlet and the air outlet, a valve sleeve connected to the valve body, and a locking piece, wherein the locking piece is used for fixing the relative position of the valve body and the valve sleeve, the valve sleeve is positioned in the air inlet and is in threaded connection with the valve body, and the driving assembly enables the valve core to be abutted against the end face of the valve sleeve so as to cover and seal the air inlet.

The utility model also provides a breathing machine, the breathing machine include the proportional valve.

The utility model provides a proportional valve's beneficial effect lies in: the flow of the proportional valve can be controlled by controlling the movement of the valve core through the driving assembly, and the valve core is in rigid contact with the inner wall of the valve body, namely, the air inlet is covered and sealed in a hard sealing mode, so that the contact part of the valve core and the inner wall of the valve body cannot generate elastic deformation in a larger gas pressure range, and particularly when the gas pressure is larger and the gas flow is smaller, the phenomenon that the gas flow control precision is not high due to the elastic deformation of the valve core can be avoided, the control precision of the proportional valve is optimized, and the hard sealing mode is also favorable for improving the response speed of the proportional valve.

The utility model provides a breathing machine includes above-mentioned proportional valve, therefore possesses above-mentioned proportional valve's whole beneficial effect, and here is no longer repeated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a proportional valve according to an embodiment of the present invention;

FIG. 2 is a schematic top view of the proportional valve shown in FIG. 1;

3 FIG. 3 3 3 is 3 a 3 schematic 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 the 3 proportional 3 valve 3 shown 3 in 3 FIG. 3 2 3; 3

FIG. 4 is an enlarged schematic view of portion B of the proportional valve shown in FIG. 3;

FIG. 5 is a schematic cross-sectional view of a portion of the proportional valve shown in FIG. 3;

Fig. 6 is an exploded view of the valve core and the driving assembly used in the proportional valve shown in fig. 1.

Wherein, in the figures, the respective reference numerals:

10. A proportional valve;

100. A valve body; 110. a valve body; 111. an air inlet; 112. an air outlet; 113. a cavity; 120. a valve sleeve; 121. an end face; 122. a cavity is communicated; 130. a locking member;

200. A valve core; 210. a core body; 211. a mating cavity; 220. a gasket; 221. a first arc surface; 230. a screw;

300. A drive assembly; 310. a power element; 311. a motor body; 312. a motion bar; 320. a holding member; 321. a ball head portion; 322. a connecting rod; 323. a support; 330. an elastic member; 340. a clamping piece; 341. a connecting portion; 342. a clamping plate; 3421. a through groove; 3422. a second arc surface;

400. An air inlet joint;

500. An air outlet joint;

600. An airflow buffer head; 610. a circular table portion; 620. a hemispherical portion;

700. A pressure sampling nozzle.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

An embodiment of the present invention provides a proportional valve 10 and a breathing machine including the proportional valve 10, please refer to fig. 1 to 5 together, and now describe the proportional valve 10 provided by the present invention.

The proportional valve 10 includes a valve body 100, a valve core 200, a driving assembly 300, an inlet connector 400, and an outlet connector 500. Wherein, the valve body 100 is provided with an air inlet 111, an air outlet 112, and a cavity 113 communicated with the air inlet 111 and the air outlet 112; the air inlet connector 400 is connected to the valve body 100, is communicated with the air inlet 111, and is used for being connected with an air inlet pipeline of a breathing machine; the air outlet connector 500 is connected to the valve body 100 and communicates with the air outlet 112 for connecting with an air outlet pipeline of a respirator. The valve core 200 is arranged in the cavity 113, the driving assembly 300 is connected to the valve body 100, and the driving assembly 300 can support the valve core 200 against the inner wall of the valve body 100, so that the valve core 200 covers the air inlet 111, and the air path between the air inlet 111 and the air outlet 112 is cut off; the driving assembly 300 can also drive the valve plug 200 away from the inner wall of the valve body 100, that is, a gap is reserved between the valve plug 200 and the inner wall of the valve body 100, so that the air inlet 111 and the air outlet 112 are communicated with each other; in addition, when the valve element 200 abuts against the inner wall of the valve body 100, the valve element 200 is in rigid contact with the inner wall of the valve body 100.

In this way, the flow rate of the proportional valve 10 can be controlled by controlling the movement of the valve core 200 through the driving assembly 300, and since the valve core 200 is in rigid contact with the inner wall of the valve body 100, that is, the gas inlet 111 is covered in a hard sealing manner, so that the contact part of the valve core 200 and the inner wall of the valve body 100 is not elastically deformed in a large gas pressure range, especially when the gas pressure is large and the gas flow rate is small, for example, the pressure value is 150cmH2O, the phenomenon that the gas flow rate control accuracy is not high due to the elastic deformation of the valve core 200 is avoided, thereby optimizing the control accuracy of the proportional valve 10, and the hard sealing manner is also helpful for improving the response speed of the proportional valve 10.

In addition, the air inlet connector 400 and the air outlet connector 500 may be distributed along the same straight line, or may be distributed along two straight lines perpendicular to each other, which is not limited herein.

In an embodiment, the valve body 100 includes a valve body 110, a valve sleeve 120 and a locking member 130, wherein the valve body 110 is provided with the air inlet 111, the air outlet 112 and a cavity 113, the valve sleeve 120 is disposed at the air inlet 111 and is in sealing fit with the valve body 110, the valve sleeve 120 has a through cavity 122, the through cavity 122 is located in the air inlet 111, and it can be understood that the valve element 200 covers the through cavity 122, which is equivalent to covering the air inlet 111, so as to cut off an air path between the air inlet 111 and the air outlet 112. In this embodiment, the valve core 200 is supported by the driving assembly 300 against the end surface 121 of the valve sleeve 120, so as to cover the through cavity 122, i.e. block the air inlet 111.

In addition, in the present embodiment, the valve sleeve 120 is movably connected to the valve body 110, and the relative position between the valve sleeve 120 and the valve body 110 is fixed by the locking member 130; that is, the user can adjust the relative position of the valve sleeve 120 and the valve body 110 according to actual needs, and the valve sleeve is fixed by the locking member 130 after being adjusted. Since the valve sleeve 120 is in direct contact with the valve core 200, the change in the position of the valve sleeve 120 directly affects the pressure required by the valve core 200 to seal the valve, so that the user can obtain the required valve sealing pressure by adjusting the relative position of the valve sleeve 120 and the valve body 110; particularly, when machining or assembly errors affect the sealing pressure of the proportional valve 10, the relative position of the valve sleeve 120 and the valve body 110 can be adjusted to maintain the sealing pressure of the proportional valve 10 at a standard value, so that the control accuracy of the proportional valve 10 is further improved, and the product performance of the proportional valve 10 and even the respirator is optimized.

In one embodiment, the valve sleeve 120 is threadedly coupled to the valve body 110, and the locking member 130 is a locking nut that is sleeved around the valve sleeve 120 and threadedly coupled to the valve sleeve 120, and that is also in abutting engagement with the valve body 110 to prevent relative movement between the valve sleeve 120 and the valve body 110. In the present invention, the direction from the air inlet 111 to the cavity 113 is defined as the air inlet direction, and the valve sleeve 120 can move along the air inlet direction relative to the valve body 110. Of course, in other embodiments of the present invention, the valve sleeve 120 and the valve body 110 may be movably connected by other means, such as clamping, but not limited thereto.

Of course, in other embodiments of the present invention, the valve sleeve 120 and the locking member 130 can be omitted, and are not limited herein.

In an embodiment, the proportional valve 10 further includes an air flow buffering head 600 connected to the valve core 200 and extending into the through cavity 122, and a cross-sectional area of the air flow buffering head 600 perpendicular to the air intake direction is gradually increased along the air intake direction. The airflow buffering head 600 is mainly used for avoiding direct opposite flushing of a large amount of airflow to the valve core 200 in the direction perpendicular to the plane of the valve core 200, so that on one hand, noise can be reduced, on the other hand, the airflow is relaxed, and the user experience of the breathing machine is improved. Preferably, the airflow buffering head 600 is shaped like a cone, and specifically includes a circular truncated cone portion 610 and a hemispherical portion 620; of course, in other embodiments of the present invention, the specific shape of the airflow buffering head 600 may be determined according to the requirement, so as to include the case with a certain taper, which is not limited herein.

In an embodiment, the driving assembly 300 includes a power element 310, a supporting member 320, an elastic member 330 and a locking member 340, wherein opposite ends of the elastic member 330 respectively support against one end of the supporting member 320 and the valve body 100, and the other end of the supporting member 320 supports against the valve element 200 under the elastic force of the elastic member 330, so as to support the valve element 200 against the end surface 121 of the valve sleeve 120 and cover the air inlet 111. Specifically, the elastic member 330 is in a compressed state between the valve body 100 and the abutting member 320, so that the elastic member 330 tends to recover its deformation under its own elastic potential energy, because the valve body 100 is fixed, the elastic member 330 can drive the valve element 200 to move towards the valve sleeve 120, the elastic force of the elastic member 330 causes the valve element 200 to abut against the end surface of the valve sleeve 120, and the pressing force applied by the valve element 200 to the valve sleeve 120 becomes the valve sealing pressure of the valve element 200 to the valve body 100.

In addition, the power element 310 is connected to the abutting element 320, and is used for driving the abutting element 320 to drive the valve core 200 to move in a direction away from the valve sleeve 120, so as to remove the valve sealing pressure of the valve core 200 on the valve sleeve 120, and the abutting element 320 abuts against the position-locking element 340, and the position-locking element 340 is connected to the valve core 200, so that when the abutting element 320 moves backwards under the action of the power element 310, the position-locking element 340 can drive the valve core 200 to move backwards, so that a gap is formed between the valve core 200 and the end surface 121 of the valve sleeve 120, and the air inlet 111 and the air outlet 112 are communicated, thereby achieving the valve opening.

In this embodiment, the power element 310 is preferably a voice coil motor, the voice coil motor includes a motor body 311 and a moving rod 312 movably connected to the motor body 311, the motor body 311 is connected to the valve body 100 and located outside the cavity 113, and the moving rod 312 extends into the cavity 113 and is connected to the abutting member 320; the motor body 311 can drive the moving rod 312 to move linearly along the axial direction of the moving rod 312, so that the supporting member 320 can be driven by the motor body to retract along the linear direction, and the locking member 340 and the valve element 200 are driven to be away from the end surface 121 of the valve sleeve 120. The voice coil motor has the characteristics of simple structure, small volume, high speed, high acceleration and quick response, and the force output by the voice coil motor through the motion rod 312 is proportional to the current, so that the regulation and control are also very convenient.

Wherein the voice coil motor is mounted to the valve body 100 by screw locking and sealed by a sealing member.

In an embodiment, the valve core 200 includes a core body 210 and a washer 220, the core body 210 is connected to the airflow buffering head 600 by a screw 230 and is provided with a matching cavity 211, the washer 220 is fixedly disposed in the matching cavity 211, and the washer 220 has a first arc surface 221 capable of fitting with a spherical surface. The core body 210 is a rigid member, such as a metal member.

Of course, in other embodiments of the present invention, the matching cavity 211 may also be omitted, and the gasket 220 is directly disposed on the core body 210, and the two are fixed relatively, which is not limited herein.

Of course, in other embodiments of the present invention, the gasket 220 can be omitted, and the abutting member 320 directly abuts against the core body 210, which is not limited herein.

In this embodiment, the supporting member 320 includes a ball portion 321, a connecting rod 322 and a bracket 323; the head 321 is spherical and connected to one end of the connecting rod 322, the connecting rod 322 is in the shape of a cylindrical rod, the diameter of the head 321 is larger than that of the connecting rod 322, the bracket 323 is connected to the other end of the connecting rod 322, and the other end of the connecting rod 322 is fixedly connected to the motion rod 312.

The two opposite ends of the elastic member 330 respectively abut against the valve body 100 and the bracket 323, so that the ball head 321 abuts against the gasket 220, and the core body 210 is abutted to seal the through cavity 122, i.e., seal the air inlet 111, where the spherical surface of the ball head 321 abuts against and cooperates with the first arc surface 221 of the gasket 220. As can be understood, since the spherical surface of the ball head portion 321 and the first arc surface 221 of the washer 220 are in abutting fit with each other in an arc surface contact manner, the ball head portion 321 and the washer 220 can be adjusted in a universal manner, so that the core body 210 and the end surface 121 of the valve sleeve 120 are always in surface-to-surface contact, thereby effectively compensating the air tightness problem of the proportional valve 10 caused by machining, assembly or other manufacturing errors.

In the present embodiment, the ball portion 321, the connecting rod 322, and the bracket 323 are integrally molded.

The locking member 340 includes a connecting portion 341 and a locking plate 342 bent and connected to one end of the connecting portion 341, the connecting portion 341 is connected to the core body 210, and the locking plate 342 is located below the fitting cavity 211 to limit the ball head portion 321 within the fitting cavity 211. Specifically, the positioning plate 342 is provided with a through groove 3421, one end of the connecting rod 322 is connected to the moving rod 312, and the other end passes through the through groove 3421 and is connected to the head 321, i.e., the connecting rod 322 can pass through the through groove 3421; a second arc surface 3422 is further disposed around the through groove 3421, and the spherical surface of the head 321 abuts against the second arc surface 3422.

Specifically, when the motor body 311 drives the moving rod 312 to retract, the abutting member 320 connected thereto also moves in a direction away from the air inlet 111, and the ball portion 321 abutting against the retaining plate 342 drives the entire retaining member 340 to move in a direction away from the air inlet 111, because the retaining member 340 is connected to the core body 210, the valve core 200 can be driven away from the end surface 121 of the valve sleeve 120 to connect the air passage between the air inlet 111 and the air outlet 112. As can be appreciated, since the spherical surface of the ball head portion 321 and the second arc surface 3422 of the blocking plate 342 are in contact with each other in an arc surface manner, the ball head portion 321 can freely adjust the relative position with the blocking member 340 in any direction, thereby effectively compensating the air tightness problem of the proportional valve 10 caused by machining, assembling or other manufacturing errors.

In addition, referring to fig. 4 and fig. 6, the through groove 3421 extends to one side edge of the locking plate 342 along a direction perpendicular to the axis of the connecting rod 322, and the connecting rod 322 can be detached from the locking member 340 along the extending direction of the through groove 3421, so that the installation of the supporting member 320 is facilitated.

In addition, referring to fig. 1, a pressure sampling nozzle 700 is disposed on an outer wall of the air inlet connector 400, and the pressure sampling nozzle 700 is communicated with the air inlet connector and is used for collecting a pressure value in the air inlet connector 400.

It can be understood that the present invention provides a ventilator, which has all the technical features and advantages of the proportional valve 10, including the proportional valve 10, and therefore, the present invention is not described herein again.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. Proportional valve, its characterized in that: the valve body is provided with an air inlet, an air outlet and a cavity communicated with the air inlet and the air outlet, the valve core is arranged in the cavity, the driving component can support the valve core on the inner wall of the valve body to cover the air inlet and drive the valve core to be away from the inner wall of the valve body to be communicated with the air inlet and the air outlet, and the valve core is in rigid contact with the inner wall of the valve body.

2. The proportioning valve of claim 1 wherein: the driving assembly comprises an elastic piece and a propping piece which are positioned in the cavity, two opposite ends of the elastic piece are respectively propped against one end of the propping piece and the valve body, and the other end of the propping piece is propped against the valve core.

3. The proportioning valve of claim 2 wherein: the valve core comprises a core body and a gasket, and the gasket is fixedly arranged on the core body; the gasket is provided with a first arc surface, the abutting piece comprises a ball head part, and the elastic piece drives the ball head part to abut against the first arc surface so as to abut against the core body on the inner wall of the valve body.

4. The proportioning valve of claim 2 wherein: the driving assembly further comprises a power element which is connected with the abutting piece and can drive the abutting piece to be far away from the valve core, and a clamping piece which is connected with the valve core, and the abutting piece is abutted against the clamping piece.

5. The proportioning valve of claim 4 wherein: the clamping piece is provided with a through groove, the abutting piece comprises a ball head portion and a connecting rod, one end of the connecting rod is connected to the power element, the other end of the connecting rod penetrates through the through groove to be connected with the ball head portion, the clamping piece is further provided with a second arc surface surrounding the through groove, and the ball head portion abuts against the second arc surface.

6. The proportioning valve of claim 5 wherein: the support piece also comprises a support connected with the connecting rod, and two opposite ends of the elastic piece respectively support against the support and the valve body.

7. The proportioning valve of claim 4 wherein: the power element is a voice coil motor, the voice coil motor comprises a motor body and a moving rod, one end of the moving rod is movably connected with the motor body, and the other end of the moving rod is fixedly connected with the abutting piece.

8. The proportioning valve of any of claims 1 to 7 wherein: the proportional valve also comprises an airflow buffering head which is connected with the valve core and is positioned in the air inlet; the cross-sectional area of the airflow buffering head perpendicular to the air inlet direction is gradually increased along the air inlet direction, and the air inlet direction is the direction from the air inlet to the cavity.

9. The proportioning valve of any of claims 1 to 7 wherein: the valve body comprises a valve body, a valve sleeve and a locking piece, the valve body is provided with the cavity, the air inlet and the air outlet, the valve sleeve is connected to the valve body, the valve sleeve is positioned in the air inlet and is in threaded connection with the valve body, the locking piece is used for fixing the relative position of the valve body and the valve sleeve, and the driving assembly enables the valve core to be abutted to the end face of the valve sleeve so as to cover and seal the air inlet.

10. Breathing machine, its characterized in that: the ventilator comprising a proportional valve as claimed in any of claims 1 to 9.