CN116044808A

CN116044808A - Miniature fan for breathing machine and impeller thereof

Info

Publication number: CN116044808A
Application number: CN202310075459.7A
Authority: CN
Inventors: 郭瑞; 刘�东; 张振建
Original assignee: Shenzhen Dedaxing Drive Technology Co ltd
Current assignee: Shenzhen Dedaxing Drive Technology Co ltd
Priority date: 2023-01-11
Filing date: 2023-01-11
Publication date: 2023-05-02

Abstract

The application relates to fan technical field discloses a miniature fan and impeller for breathing machine, and it includes: the chassis is provided with an air inlet area positioned in the middle and an air outlet area positioned at the circumferential side edge; the blades are multiple in number and are fixedly arranged on the chassis, and the blades are used for guiding air flow from the air inlet area to the air outlet area; the blades are provided with air inlet ends close to the air inlet areas and air outlet ends positioned in the air outlet areas, and the heights of the blades gradually decrease from the air inlet ends to the air outlet ends; the blade angle beta 1 at the blade air inlet end and the blade angle beta 2 at the air outlet end are both 15-35 degrees, the width between the adjacent blade air inlet ends is d1, the width between the adjacent blade air outlet ends is d2, d1=2-3 mm, d2=6-9 mm; the outer diameter of the air outlet end of the blade is D1, and D1=42-48 mm. The impeller with smaller wind loss is formed through the design of the blades, the size of the impeller can be effectively reduced while the air supply effect is ensured, and the compactness of the whole structure is improved.

Description

Miniature fan for breathing machine and impeller thereof

Technical Field

The application relates to the technical field of fans, in particular to a miniature fan for a breathing machine and an impeller thereof.

Background

In modern clinical medicine, a respirator is used as an effective means capable of replacing autonomous ventilation by manpower, is widely used for respiratory failure caused by various reasons, anesthesia respiratory management during major surgery, respiratory support treatment and emergency resuscitation, and occupies a very important position in the field of modern medicine. The breathing machine is a vital medical device which can prevent and treat respiratory failure, reduce complications, save and prolong the life of patients.

Turbine fans are key components of ventilators, and with the wide application of portable ventilators, the requirements on the size compactness of the fans are more and more strict. The motor drives the impeller to rotate so as to supply air, and in order to ensure the air supply efficiency of air supply at a certain rotating speed, the existing fan needs to select the impeller with larger size for air supply, so that the size compactness of the fan is poor.

Disclosure of Invention

In order to solve the problem of poor structural compactness of the fan caused by larger impeller size in the prior art,

the application provides a miniature fan for breathing machine and impeller adopts following scheme:

in a first aspect, the present application provides an impeller according to the following scheme:

an impeller, comprising: the chassis is provided with an air inlet area positioned in the middle and an air outlet area positioned at the circumferential side edge; the blades are multiple in number and are fixedly arranged on the chassis, and the blades are used for guiding air flow from the air inlet area to the air outlet area; the blades are provided with air inlet ends close to the air inlet areas and air outlet ends positioned in the air outlet areas, and the heights of the blades gradually decrease from the air inlet ends to the air outlet ends; the blade angle beta 1 at the blade air inlet end and the blade angle beta 2 at the air outlet end are both 15-35 degrees, the width between the adjacent blade air inlet ends is d1, the width between the adjacent blade air outlet ends is d2, d1=2-3 mm, d2=6-9 mm; the outer diameter of the air outlet end of the blade is D1, and D1=42-48 mm.

Through adopting above-mentioned scheme, design the wind channel that a plurality of blades formed to effectively reduced the impeller size when guaranteeing efficiency. In the traditional technical scheme, in order to ensure the air supply efficiency when the impeller rotates, under the condition of a certain rotating speed, the whole size of the impeller is generally increased, so that the air supply efficiency of the impeller is ensured. However, since the existing ventilators gradually develop toward the household portability, the overall compactness of the blower needs to be guaranteed to be adapted to the size of the micro-ventilator, and the existing impellers are large, so that the blower is insufficient in compactness and large in size. In the technical scheme, on one hand, the outer diameter of the blade is reduced to about 45mm, so that the compactness of the fan is guaranteed through the smaller impeller size; meanwhile, the blade angles of the air inlet end and the air outlet end of the blade are 15-35 degrees, d1=2-3 mm and d2=6-9 mm, so that the air quantity loss can be effectively reduced in actual working conditions, and the air supply efficiency is ensured. On the other hand, the small impeller size effectively reduces the rotational inertia of the impeller, is more beneficial to frequent start and stop, and has lower noise.

Optionally, the air inlet device further comprises a connecting seat, wherein the connecting seat is positioned in the middle of the air inlet area; the connecting seat, the blades and the chassis are integrally formed into an impeller.

By adopting the scheme, the chassis, the connecting seat and the blades are integrally formed into the impeller, and the forming process is simple. The turbine fan is a key part of the breathing machine, and has high technical content and high production difficulty. The impeller is a core component in the fan, and the impeller is mainly used for driving air to rotate and accelerate so as to realize air flow, and the performance of the impeller directly influences various index parameters and manufacturing cost of the fan. The existing impeller at present generally comprises a bearing disc, blades and a cover plate, wherein the blades are arranged around the central axis of the bearing disc, and the cover plate is in a circular shape and is fixedly covered on all the blades at the same time, so that the blades are positioned between the cover plate and the bearing disc, and air flow is axially introduced into the middle part of the circular cover plate and is guided by the blades to be discharged from the periphery; in the manufacturing process, the integral impeller can be manufactured and molded by a core pulling manufacturing process, and the manufacturing mould and the process are complex. In this embodiment in the community, the connecting seat is at air inlet regional middle part and with the blade each other do not shelter from to the shelter from of apron has been removed, in order to make in the actual preparation, can realize the rapid prototyping to the impeller through mould opening after the last lower mould compound injection moulding, the simple and precision of manufacturing process easily obtains guaranteeing.

Optionally, the air inlet end of the blade is provided with a windward surface facing the air inlet area, and the windward surface gradually extends upwards in an inclined manner from one end close to the air inlet area to one end far away from the air inlet area.

By adopting the scheme, the air inlet end of the blade is set to be an inclined extending windward surface. In actual working conditions, air flow at an air inlet of the fan usually axially enters the air along the rotation axis direction of the chassis. The terminal surface of blade inlet end is in parallel with the air inlet direction in traditional technical scheme usually, however in the actual conditions inlet end when rotating easily forms the vortex and leads to wind loss in the air inlet region, and air supply efficiency receives the influence. In this technical scheme, through setting up the terminal surface of air inlet end into the windward side that the slope was arranged, impeller is at the rotation in-process, and the air current influence that the air inlet end of blade was sent into the air intake is by showing to reduce the windage to the air supply, promoted air supply efficiency.

Optionally, the air outlet area of the chassis is provided with a plurality of air deflectors at intervals, one air deflector is correspondingly arranged between the air outlet ends of every two adjacent blades, and the distances between the air deflectors and the blades on two sides are equal.

By adopting the scheme, the air deflector is arranged in the air outlet area on the chassis. In some technical schemes, after the air flow is axially sent into the air inlet area, the air flow moves to the air outlet area along the air channel between the adjacent blades under the action of centrifugal force along with the rotation of the impeller; in actual working conditions, vortex is easy to generate when airflow moves to an air outlet area, so that noise is loud. According to the air conditioner, the air deflector is arranged between the air outlet ends of the two adjacent blades, so that air flow in the air outlet area can be layered, vortex generated by the air flow in the air supply area is reduced, and wind noise generated by a fan is effectively reduced.

Optionally, the aviation baffle includes connecting portion and wind-guiding portion, connecting portion with wind-guiding portion stack in proper order fixed mounting in on the chassis, the orthographic projection of connecting portion on the chassis is greater than the orthographic projection of wind-guiding portion on the chassis.

Through adopting above-mentioned scheme, the aviation baffle includes connecting portion and air ducting, and air ducting passes through connecting portion to be installed on the chassis. In the actual condition, because the orthographic projection of connecting portion on the chassis is greater than the orthographic projection of wind-guiding portion on the chassis, the thickness of connecting portion is greater than the thickness of wind-guiding portion promptly, compares in the even setting of aviation baffle thickness in some schemes, and the intensity of this application connecting portion is higher, has promoted the bending strength of this aviation baffle.

In a second aspect, a micro fan for a ventilator based on the impeller adopts the following technical scheme:

optionally, the impeller comprises a volute, a driving motor and an impeller according to any one of claims 1 to 5, wherein the volute comprises an upper shell and a lower shell, the upper shell and the lower shell are detachably connected through threads to form an airflow chamber, the airflow chamber is provided with an air inlet opposite to the air inlet area and an air outlet facing to the side edge of the air outlet area, the impeller is installed in the airflow chamber and is in transmission connection with the driving motor, and the driving motor is used for driving the impeller to rotate and sending airflow from the air inlet to the air outlet.

By adopting the scheme, the volute comprises an upper shell and a lower shell, and the upper shell is detachably connected with the lower shell through threads. In some technical schemes, the volute of the fan is of an integrated structure, so that the fan is inconvenient to assemble and disassemble. The spiral case of this application technical scheme is by epitheca and inferior valve mutual lid closes and constitutes, and dismouting convenience is higher.

Optionally, a plurality of vibration reduction convex strips are circumferentially arranged on the periphery of the air inlet of the volute.

By adopting the scheme, a plurality of vibration reduction convex strips are arranged on the periphery of the air inlet of the volute. In the running process of the fan, the motor and the fan blade have inherent rotation fundamental frequency in the rotation process, and the spiral case can resonate at a certain frequency, so that the vibration noise is overhigh. In this application technical scheme, through being provided with a plurality of damping sand grip on the spiral case for the thickness of spiral case is changed the structure that thickness has the change by traditional unified thickness, and the change of this kind of thickness makes the different position resonance frequency of shell body different, can eliminate or reduce the spiral case resonance at a certain point from this, thereby reduces the noise that resonance produced effectively.

Optionally, the driving motor comprises a rotor and a shell, and the rotor is rotatably arranged in the shell and is in tight fit and plug connection with the connecting seat; the housing is internally provided with an installation cavity, the installation cavity is provided with a communication hole communicated with the airflow cavity, a bearing is installed in the installation cavity in a clamping manner, and the rotor is rotationally connected with the bearing and penetrates through the communication hole.

Through adopting above-mentioned scheme, the rotor is connected with the impeller after passing the bearing, and the bearing plays the effect that bears the weight of the support to the rotor, has further guaranteed the stability of rotor installation.

Optionally, the bearing further comprises a first sealing ring and a second sealing ring, wherein the first sealing ring is installed between the shell and the bearing in a pressing mode, and the first sealing ring is arranged around the communication hole; the second seal ring is disposed around the bearing periphery.

Through adopting above-mentioned scheme, be provided with first sealing washer and second sealing washer, through double-deck sealing mechanism's setting, can be effectively with mutual isolation between air current cavity and the driving motor inside, guarantee effectively that the air current in the air current cavity flows out by the air outlet, reduce the air current to other positions outflow and lead to the problem that air supply efficiency reduces, and then can guarantee air supply efficiency effectively.

Optionally, the rotor diameter is D2, d2=9 mm.

By adopting the scheme, the diameter of the rotor is 9mm. In some technical schemes, the rotor has larger rotational inertia due to larger diameter of the rotor, so that the rotor is difficult to be adapted to the opening and closing of a high-frequency fan. In this application technical scheme, the rotor diameter is 9mm, has reduced moment of inertia for the rotor in the traditional miniature fan is showing, can adapt to the high frequency of fan and opens and close, has further promoted the response speed of fan.

In summary, the present application includes at least the following beneficial technical effects:

1. the air duct is formed by the blades, so that the size of the impeller is effectively reduced while the efficiency is ensured. In the traditional technical scheme, in order to ensure the air supply efficiency when the impeller rotates, under the condition of a certain rotating speed, the whole size of the impeller is generally increased, so that the air supply efficiency of the impeller is ensured. However, since the existing ventilators gradually develop toward the household portability, the overall compactness of the blower needs to be guaranteed to be adapted to the size of the micro-ventilator, and the existing impellers are large, so that the blower is insufficient in compactness and large in size. In the technical scheme, on one hand, the outer diameter of the blade is reduced to about 45mm, so that the compactness of the fan is guaranteed through the smaller impeller size; meanwhile, the blade angles of the air inlet end and the air outlet end of the blade are 15-35 degrees, d1=2-3 mm and d2=6-9 mm, so that the air quantity loss can be effectively reduced in actual working conditions, and the air supply efficiency is ensured. On the other hand, the small impeller size effectively reduces the moment of inertia of the impeller, is more beneficial to frequent start and stop, and has lower noise;

2. the chassis, the connecting seat and the blades are integrally formed into the impeller, and the forming process is simple. The turbine fan is a key part of the breathing machine, and has high technical content and high production difficulty. The impeller is a core component in the fan, and the impeller is mainly used for driving air to rotate and accelerate so as to realize air flow, and the performance of the impeller directly influences various index parameters and manufacturing cost of the fan. The existing impeller at present generally comprises a bearing disc, blades and a cover plate, wherein the blades are arranged around the central axis of the bearing disc, and the cover plate is in a circular shape and is fixedly covered on all the blades at the same time, so that the blades are positioned between the cover plate and the bearing disc, and air flow is axially introduced into the middle part of the circular cover plate and is guided by the blades to be discharged from the periphery; in the manufacturing process, the integral impeller can be manufactured and molded by a core pulling manufacturing process, and the manufacturing mould and the process are complex. In this embodiment in the community, the connecting seat is at air inlet regional middle part and with the blade each other do not shelter from to the shelter from of apron has been removed, in order to make in the actual preparation, can realize the rapid prototyping to the impeller through mould opening after the last lower mould compound injection moulding, the simple and precision of manufacturing process easily obtains guaranteeing. The method comprises the steps of carrying out a first treatment on the surface of the

3. An air deflector is arranged in the air outlet area on the chassis. In some technical schemes, after the air flow is axially sent into the air inlet area, the air flow moves to the air outlet area along the air channel between the adjacent blades under the action of centrifugal force along with the rotation of the impeller; in actual working conditions, vortex is easy to generate when airflow moves to an air outlet area, so that noise is loud. According to the air conditioner, the air deflector is arranged between the air outlet ends of the two adjacent blades, so that air flow in the air outlet area can be layered, vortex generated by the air flow in the air supply area is reduced, and wind noise generated by a fan is effectively reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of an impeller according to an embodiment of the present application;

FIG. 2 is a schematic front view of an impeller according to an embodiment of the present application showing the dimensions of the impeller;

FIG. 3 is a schematic view of a prior art impeller;

FIG. 4 is an exploded schematic view of a micro fan according to an embodiment of the present application;

fig. 5 is a cross-sectional view of an embodiment of the present application showing the internal structure of a micro fan.

Reference numerals illustrate:

1. a chassis; 11. an air inlet area; 12. an air outlet area; 13. a connecting seat; 131. a plug hole;

2. a blade; 21. an air inlet end; 22. an air outlet end; 23. a windward side;

3. a carrying tray; 31. a fan blade; 32. a cover plate;

4. an air deflector; 41. a connection part; 42. an air guide part;

5. a volute; 51. an upper case; 52. a lower case; 53. an airflow chamber; 54. an air inlet; 55. an air outlet; 56. vibration-damping convex strips;

6. a driving motor; 61. a rotor; 611. a plug-in shaft; 62. a stator; 63. a housing; 631. a communication hole; 64. a mounting base; 651. a mounting cavity; 652. a bearing; 653. a first seal ring; 654. and a second sealing ring.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a miniature fan for a breathing machine and an impeller thereof.

Referring to fig. 1 and 2, an impeller, comprising: the air conditioner comprises a chassis 1 and a plurality of blades 2, wherein the chassis 1 is provided with an air inlet area 11 positioned in the middle and an air outlet area 12 positioned at the circumferential side edge, the blades 2 are fixedly arranged on the chassis 1, and the blades 2 are used for guiding air flow from the air inlet area 11 to the air outlet area 12 along with rotation of the chassis 1. The blades 2 are provided with air inlet ends 21 close to the air inlet areas 11 and air outlet ends 22 positioned in the air outlet areas 12, and the heights of the blades 2 gradually descend from the air inlet ends 21 to the air outlet ends 22; the blade 2 angle beta 1 at the air inlet end 21 of the blade 2 and the blade 2 angle beta 2 at the air outlet end 22 are both 15-35 degrees, the width between the air inlet ends 21 of adjacent blades 2 is d1, the width between the air outlet ends 22 of adjacent blades 2 is d2, d1=2-3 mm, d2=6-9 mm; the outer diameter of the air outlet end 22 of the blade 2 is D1, d1=42-48 mm.

Referring to fig. 1 and 3, the chassis 1 has a disc-shaped structure, a connecting seat 13 is provided in the middle of the air inlet area 11, and the connecting seat 13, the blades 2 and the chassis 1 are integrally formed. Specifically, the chassis 1 has a front surface and a back surface, the air inlet area 11 is located in the middle of the front surface of the chassis 1, the air outlet area 12 is located at the circumferential side edge of the front surface of the chassis 1, and the connecting seat 13 and the blades 2 are integrally formed on the front surface of the chassis 1. It should be noted that in the prior art, the impeller generally includes a bearing disc 3, blades 31 and a cover plate 32, the blades 31 are disposed around a central axis of the bearing disc 3, the cover plate 32 is in a ring shape and is fixedly covered on all the blades 31, so that the blades 31 are located between the cover plate 32 and the bearing disc 3, and air flows are axially introduced from a middle portion of the ring-shaped cover plate 32 and then are guided by the blades 31 to flow out from the circumferential direction. However, in the manufacturing process of the impeller in the prior art, the whole impeller needs to be manufactured and molded by a manufacturing process of loose core, and a manufacturing mold and a manufacturing process are complex. In this application technical scheme, the impeller comprises chassis 1 and integrated into one piece in chassis 1 positive blade 2 and connecting seat 13, and the impeller is in actual manufacturing flow, and the die sinking can be realized the rapid prototyping to the impeller after the injection molding through last lower mould compound die, and simple in manufacturing process and precision easily obtain guaranteeing.

Referring to fig. 1 and 3, the air outlet area 12 of the chassis 1 is provided with a plurality of air deflectors 4 at intervals, one air deflector 4 is correspondingly arranged between the air outlet ends 22 of every two adjacent blades 2, the distances between the blades 2 on two sides of the air deflectors 4 are equal, and the air deflectors 4 are used for layering the air flow of the impeller air outlet area 12 so as to reduce wind noise generated by turbulent flow. Specifically, in the embodiment of the present application, 17 blades 2 and 17 air deflectors 4 are circumferentially arranged on the front surface of the chassis 1 at intervals. The air deflector 4 comprises a connecting part 41 and an air guiding part 42, wherein the connecting part 41 and the air guiding part 42 are sequentially stacked and fixedly arranged on the chassis 1, the orthographic projection of the connecting part 41 on the chassis 1 is larger than that of the air guiding part 42 on the chassis 1, and the joint of the connecting part 41 and the chassis 1 is provided with a chamfer. It should be noted that the blades 2 and the wind deflector 4 are extended from the front surface of the chassis 1 to the back surface of the chassis 1, so as to further improve the strength.

Referring to fig. 2 and 3, the air inlet end 21 of the blade 2 has a windward side 23 facing the air inlet region 11, the windward side 23 extending gradually obliquely upward from an end near the air inlet region 11 to an end distant from the air inlet region 11. Specifically, the windward side 23 extends to the high-position end and then gradually extends downwards to the air outlet end 22 of the blade 2, so that the height of the blade 2 gradually decreases, and in this embodiment, the thickness of the blade 2 gradually decreases from the air inlet end 21 to the air outlet end 22, the outer diameter D1 of the air outlet end 22 of the blade 2 is specifically designed to be 45mm, D1 is 2.34mm, and D2 is 7.82mm.

Referring to fig. 4 and 5, the embodiment of the present application further discloses a micro fan for a ventilator, including a volute 5, a driving motor 6 and an impeller, where the volute 5 includes an upper shell 51 and a lower shell 52, the upper shell 51 and the lower shell 52 are detachably connected through a plurality of bolts and cover each other to form an airflow chamber 53, and the driving motor 6 is in transmission connection with the impeller and is installed inside the volute 5; the airflow chamber 53 has an air inlet 54 facing the air inlet area 11 and an air outlet 55 facing the side edge of the air outlet area 12, and the driving motor 6 operates to drive the impeller to rotate so as to send airflow from the air inlet 54 to the air outlet 55.

Referring to fig. 4 and 5, an air inlet 54 of the scroll case 5 is penetratingly provided at a middle portion of the upper case 51, and a plurality of vibration-damping ribs 56 are circumferentially provided at an outer circumference of the air inlet 54. The driving motor 6 includes a rotor 61, a stator 62 and a housing 63, the stator 62 is fixedly installed inside the housing 63, and the rotor 61 is penetrated into the stator 62 such that the rotor 61 is rotatably installed to the housing 63. The rotor 61 is tightly connected with the connecting seat 13 in a plugging manner, specifically, a plugging shaft 611 is arranged in the axial direction of the rotor 61, a plugging hole 131 is formed in the connecting seat 13 in a penetrating manner, the plugging shaft 611 penetrates into the airflow cavity 53 from the inside of the shell 63 and is tightly connected with the plugging hole 131, and the driving motor 6 works to enable the rotor 61 to rotate so as to drive the impeller to rotate. It should be noted that, in the embodiment of the present application, the diameter of the rotor 61 is D2, d2=9mm, and compared with the diameter of the prior art, the rotational inertia is further reduced, so that the high-frequency start-stop is facilitated.

Referring to fig. 4 and 5, a communication hole 631 is formed in a side wall of the housing 63 adjacent to the airflow chamber 53, a mounting seat 64 is provided on an inner side of the housing 63, a mounting cavity 651 is provided in the mounting seat 64, and both ends of the communication hole 631 are respectively communicated with the mounting cavity 651 and the airflow chamber 53. The bearing 652 is mounted in the mounting cavity 651 in a clamped manner, the rotor 61 is rotatably connected with the bearing 652, and the rotor 61 penetrates through the communication hole 631. Specifically, the shape of the bearing 652 is adapted to the shape of the mounting cavity 651, the bearing 652 is abutted and limited in the mounting cavity 651 by the rotor 61, and the plug shaft 611 of the rotor 61 is tightly plugged into the connection seat 13 after sequentially passing through the bearing 652 and the communication hole 631.

Referring to fig. 4 and 5, further comprising a first seal ring 653 and a second seal ring 654, the first seal ring 653 being compressively mounted between the housing 63 and the end of the bearing 652, and the first seal ring 653 being disposed around the communication hole 631; the second sealing ring 654 is installed between the side edge of the bearing 652 and the inner side wall of the mounting seat 64 in a pressed mode, and the second sealing ring 654 is arranged around the periphery of the bearing 652; the first seal 653 cooperates with the second seal 654 to prevent airflow in the airflow chamber 53 from entering the housing 63.

The embodiment of the application discloses a miniature fan for breathing machine and impeller implementation principle thereof is: the outer diameter of each blade 2 is reduced to about 45mm, and the air channel formed by the plurality of blades 2 is designed, so that the impeller size is effectively reduced while the efficiency is ensured, and the compactness of the fan is ensured through the smaller impeller size. In addition, the air flow in the impeller air outlet area 12 is layered by the design of the air deflector 4 so as to reduce wind noise generated by turbulent flow; meanwhile, the design of the vibration reduction convex strips 56 further reduces the noise generated by the resonance of the volute 5.

The embodiments of this embodiment are all preferred embodiments of the present application, and are not intended to limit the scope of the present application, in which like parts are denoted by like reference numerals. Therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. An impeller, comprising:

the air conditioner comprises a chassis (1), wherein the chassis (1) is provided with an air inlet area (11) positioned in the middle and an air outlet area (12) positioned at the circumferential side edge;

the number of the blades (2) is a plurality, the blades (2) are fixedly arranged on the chassis (1), and the blades (2) are used for guiding air flow from the air inlet area (11) to the air outlet area (12);

the blades (2) are provided with air inlet ends (21) close to the air inlet areas (11) and air outlet ends (22) positioned in the air outlet areas (12), and the heights of the blades (2) gradually descend from the air inlet ends (21) to the air outlet ends (22); the angle beta 1 of the blade (2) at the air inlet end (21) of the blade (2) and the angle beta 2 of the blade (2) at the air outlet end (22) are 15-35 degrees, the width between the adjacent air inlet ends (21) of the blade (2) is d1, the width between the adjacent air outlet ends (22) of the blade (2) is d2, d1=2-3 mm, d2=6-9 mm; the outer diameter of the air outlet end (22) of the blade (2) is D1, and D1=42-48 mm.

2. An impeller according to claim 1, further comprising a connection seat (13), said connection seat (13) being located in the middle of said air intake area (11); the connecting seat (13), the blades (2) and the chassis (1) are integrally formed into an impeller.

3. An impeller according to claim 1, characterized in that the inlet end (21) of the blade (2) has a windward side (23) facing the inlet area (11), the windward side (23) extending gradually obliquely upwards from an end closer to the inlet area (11) to an end further from the inlet area (11).

4. An impeller according to claim 1, characterized in that the air outlet area (12) of the chassis (1) is provided with a plurality of air deflectors (4) at intervals, one air deflector (4) is correspondingly arranged between the air outlet ends (22) of every two adjacent blades (2), and the distance between the air deflectors (4) and the blades (2) at two sides is equal.

5. An impeller according to claim 4, wherein the air deflector (4) comprises a connecting portion (41) and an air guiding portion (42), the connecting portion (41) and the air guiding portion (42) are sequentially stacked and fixedly mounted on the chassis (1), and the orthographic projection of the connecting portion (41) on the chassis (1) is larger than the orthographic projection of the air guiding portion (42) on the chassis (1).

6. A micro fan for a breathing machine, comprising a volute (5), a driving motor (6) and an impeller according to any one of claims 1 to 5, wherein the volute (5) comprises an upper shell (51) and a lower shell (52), the upper shell (51) and the lower shell (52) are detachably connected in a threaded manner to form an airflow chamber (53), the airflow chamber (53) is provided with an air inlet (54) facing the air inlet area (11) and an air outlet (55) facing the side edge of the air outlet area (12), the impeller is installed in the airflow chamber (53) and is in transmission connection with the driving motor (6), and the driving motor (6) is operated to drive the impeller to rotate and send airflow from the air inlet (54) to the air outlet (55).

7. The micro fan for a ventilator according to claim 6, wherein a plurality of vibration damping ribs (56) are circumferentially arranged around the air inlet (54) of the volute (5).

8. A micro-fan for a ventilator according to claim 6, the drive motor (6) comprising a rotor (61) and a housing (63), the rotor (61) being rotatably mounted in the housing (63) and being in close-fitting engagement with the connection seat (13); the housing (63) is internally provided with an installation cavity (651), the installation cavity (651) is provided with a communication hole (631) communicated with the airflow cavity (53), a bearing (652) is mounted in the installation cavity (651) in a clamping manner, and the rotor (61) is rotationally connected with the bearing (652) and penetrates through the communication hole (631).

9. The micro fan for a ventilator according to claim 8, further comprising a first seal ring (653) and a second seal ring (654), wherein the first seal ring (653) is compressively mounted between the housing (63) and the bearing (652), and the first seal ring (653) is disposed around the communication hole (631); the second seal ring (654) is disposed around the outer circumference of the bearing (652).

10. A micro-fan for a ventilator according to claim 8, characterized in that the rotor (61) has a diameter D2, d2=9 mm.