CN210977909U

CN210977909U - Breathing machine and centrifugal fan thereof

Info

Publication number: CN210977909U
Application number: CN201920957580.1U
Authority: CN
Inventors: 夏聪
Original assignee: Shenzhen City Daya Medical Technology Co ltd
Current assignee: Shenzhen City Daya Medical Technology Co ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-07-10
Anticipated expiration: 2029-06-24

Abstract

The application discloses breathing machine and centrifugal fan thereof, this centrifugal fan is applied to the breathing machine, and centrifugal fan includes: the fan comprises a shell, fan blades and a noise reduction plate, wherein the shell is provided with an air inlet, an air duct and an air outlet which are sequentially communicated, the shell comprises an outer shell and an inner shell, the inner shell is positioned in the outer shell, and at least one part of the air duct is formed between the inner shell and the outer shell; the fan blade is arranged in the air duct in the shell and is adjacent to the air inlet, and the fan blade is used for being connected to a motor shaft of the motor; the noise reduction plate is of an annular structure and is sleeved on the periphery of the inner shell, the surface, close to the fan blades, of the noise reduction plate is a complete wall surface, and the wall surface is used for disturbing gas flowing through the air channel so as to reduce mutual superposition of wave crests and wave crests of specific frequency noise in the air channel and wave troughs. By the mode, the specific frequency noise generated by the breathing machine can be reduced, so that the interference of the specific frequency noise to a user is reduced.

Description

Breathing machine and centrifugal fan thereof

Technical Field

The application relates to the technical field of medical equipment, in particular to a breathing machine and a centrifugal fan thereof.

Background

In modern clinical medicine, a ventilator has been widely used in respiratory failure due to various reasons, anesthesia and breathing management during major surgery, respiratory support therapy and emergency resuscitation as an effective means for manually replacing the function of spontaneous ventilation, and has a very important position in the modern medical field. The breathing machine is a vital medical device which can prevent and treat respiratory failure, reduce complications and save and prolong the life of a patient. The centrifugal fan belongs to a noise source of the breathing machine, the use experience of a user is influenced if the noise is too large, particularly, the breathing machine is frequently used at night, the sleep of the user is possibly influenced if the noise is too large, and therefore, how to reduce the noise of the centrifugal fan becomes a focus problem concerned by various manufacturers.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application mainly solved provides a breathing machine and centrifugal fan thereof, can reduce the specific frequency noise of breathing machine.

In order to solve the above technical problem, one technical solution adopted in the embodiments of the present application is: the centrifugal fan is applied to a breathing machine and comprises: the fan comprises a shell, fan blades and a noise reduction plate, wherein the shell is provided with an air inlet, an air duct and an air outlet which are sequentially communicated, the shell comprises an outer shell and an inner shell, the inner shell is positioned in the outer shell, and at least one part of the air duct is formed between the inner shell and the outer shell; the fan blade is arranged in the air duct in the shell and is adjacent to the air inlet, and the fan blade is used for being connected to a motor shaft of the motor; the noise reduction plate is of an annular structure, is sleeved on the periphery of the inner shell and is arranged in the air duct of the shell, the surface, close to the fan blades, of the noise reduction plate is a complete wall surface, and the wall surface is used for disturbing gas flowing through the air duct so as to reduce mutual superposition of wave crests and wave crests, and wave troughs of specific frequency noise in the air duct.

In order to solve the above technical problem, another technical solution adopted in the embodiment of the present application is: a ventilator is provided, which comprises the centrifugal fan.

The embodiment of the application sets up the board of making an uproar through in the wind channel in the centrifugal fan casing, and make the board of making an uproar fall for annular structure and the cover locates interior casing periphery, the surface that the board of making an uproar falls is close to the fan blade is a complete wall, the wall disturbs the gas that flows through the wind channel, thereby reduce the emergence probability of specific frequency noise's crest and crest, trough and the mutual stack of trough in the wind channel, consequently can reduce the produced specific frequency noise of breathing machine, thereby reduce the interference of specific frequency noise to the user.

Drawings

Fig. 1 is an exploded schematic view of a centrifugal fan according to an embodiment of the present application;

FIG. 2 is a partial schematic structural view of a centrifugal fan according to an embodiment of the present application;

FIG. 3 is a schematic top view of a noise reduction plate of a centrifugal fan according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a noise reduction plate of a centrifugal fan according to an embodiment of the present application;

FIG. 5 is a partial schematic structural view of a centrifugal fan according to an embodiment of the present application;

fig. 6 is a partially exploded schematic view of a centrifugal fan according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. In addition, for convenience of description, only a part of structures related to the present application, not all of the structures, are shown in the drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The inventor of the application discovers that the noise in the 400-Hz and 600-Hz frequency band belongs to the sound of normal operation of the respirator by analyzing the noise spectrum of the centrifugal fan in the respirator in the working process. However, if the noise in other frequency bands is high, it may cause the ventilator to sound with "noise". The higher noise level in the frequency range of 100-. Such "noise" can cause discomfort to a user who is sensitive to sounds in this frequency band, thereby affecting the use experience of the ventilator.

Therefore, the centrifugal fan is improved to improve the noise generated in the working process of the centrifugal fan, namely the noise of certain specific frequency bands is reduced, and the specific structure is as follows.

Referring to fig. 1 and fig. 2, fig. 1 is an exploded schematic view of a centrifugal fan according to an embodiment of the present disclosure. Fig. 2 is a partial structural schematic diagram of a centrifugal fan according to an embodiment of the present application.

In the present embodiment, the centrifugal fan 100 is applied to a ventilator, and the centrifugal fan 100 includes: casing 10, fan blade 20 and noise reduction plate 30.

The housing 10 is provided with an air inlet a, an air duct c and an air outlet b which are sequentially communicated. The housing 10 includes an outer housing 11 and an inner housing 12, the inner housing 12 being located inside the outer housing 11 with an air duct c formed therebetween.

Alternatively, the housing 10 may include a top wall 111, side walls 112, and a bottom wall 113. The bottom wall 113 includes a first bottom wall 1131, a second bottom wall 1132 and a connecting wall 114 connected to the first bottom wall 1131 and the second bottom wall 1132 in a bending manner, the side wall 112 surrounds the connecting wall 114, and the connecting wall 114 and the second bottom wall 1132 enclose inside the housing 10 to form the inner housing 12 protruding from the first bottom wall 1131 to the top wall 111. The inner housing 12 may be cylindrical.

The side wall 112 may further include a first side wall 1121 and a second side wall 1122, and the first side wall 1121 and the second side wall 1122 are detachably connected, so that the housing 10 may be divided into two detachable upper and lower parts. Thereby facilitating installation and adjustment of the components inside the housing 10.

The fan blade 20 is disposed in the air duct c inside the housing 10 near the air inlet a, and the fan blade 20 is used for being connected to a motor shaft 41 of the motor 40.

The noise reduction plate 30 is of an annular structure, the noise reduction plate 30 is sleeved on the periphery of the inner shell 12, the surface of the noise reduction plate 30 close to the fan blades 20 is a complete wall surface P, and the wall surface P is used for disturbing gas flowing through the air duct c so as to reduce mutual superposition of wave crests and wave crests, and wave troughs of noise with specific frequency in the air duct c.

The noise reduction plate 30 is of an annular structure, so that a motor shaft 41 of the motor 40 can penetrate through the middle of the spoiler ring 31 and then be connected with the fan blades 20.

The surface of the noise reduction plate 30 close to the fan blades 20 forms a complete circular wall surface P in the casing 10, and the noise reduction plate 30 is arranged in the air duct c, so that an airflow field in the casing 10 can be changed, and the reflection and interference conditions of noise with specific frequency in the casing 10 can be changed, so that the superposition condition of sound waves in the casing 10 is improved.

The specific frequency noise refers to noise in a specific frequency band, such as 100Hz-200Hz, or 300Hz-400 Hz.

The inventor of the application discovers through long-term research and a large amount of experiments that the noise reduction plate 30 is arranged in the air duct c in the shell 10 of the centrifugal fan 100, the noise reduction plate 30 is of an annular structure and is sleeved on the periphery of the inner shell 12, the surface of the noise reduction plate 30 close to the fan blades 20 is a complete wall surface P, the wall surface P disturbs the gas flowing through the air duct c, the occurrence probability of mutual superposition of wave crests and wave crests of specific frequency noise in the air duct c and wave troughs is reduced, the specific frequency noise generated by a breathing machine can be reduced, and the interference of the specific frequency noise to users is reduced.

Optionally, referring to fig. 2, a wall surface P of the noise reduction plate 30 is perpendicular to a central axis of the fan blade 20. That is, the noise reduction plate 30 and the blades 20 are disposed in parallel.

Optionally, referring to fig. 2, a vertical distance h between the wall surface P of the noise reduction plate 30 and the fan blade 20 is 1mm to 30 mm.

Specifically, the vertical distance h between the wall surface P of the noise reduction plate 30 and the fan blade 20 is 1mm, 5mm, 10mm, 15mm or 30 mm.

Referring to fig. 3, fig. 3 is a schematic top view of a noise reduction plate of a centrifugal fan according to an embodiment of the present disclosure.

Optionally, the area of the surface of the noise reduction plate 30 close to the fan blade 20, that is, the diameter D of the wall surface P, is 0.8 to 1.2 times the diameter of the fan blade 20. The ratio of the diameter of the wall surface P to the diameter of the fan blade 20 further affects the improvement of the noise reduction plate 30 on the noise with specific frequency, and when the diameter of the wall surface P of the noise reduction plate 30 is 0.8-1.2 times of the diameter of the fan blade 20, the effect of better reducing the noise with specific frequency generated by the centrifugal fan 100 can be achieved.

Specifically, the diameter of the wall surface P of the noise reduction plate 30 may be 0.8 times, 1.0 times or 1.2 times the diameter of the fan blade 20.

Specifically, the diameter D of the fan blade 20 refers to the maximum diameter or the average diameter of the cross section of the fan blade 20 perpendicular to the central axis thereof.

Optionally, referring to fig. 3, the diameter D of the wall surface P of the noise reduction plate 30 is 40mm to 60 mm.

Specifically, the diameter D of the wall surface P of the noise reduction plate 30 is 40mm, 50mm, or 60 mm.

Through long-term research and a large number of experiments, the inventor of the application finds that after the noise reduction plate 30 is arranged in the air duct c in the shell 10 of the centrifugal fan 100, the noise frequency spectrum of the centrifugal fan 100 in the working process is measured again, whether the sound pressure level of a noise frequency band changes or not is compared, then the vertical distance h between the wall surface P of the noise reduction plate 30 and the fan blade 20, the proportion of the diameter D of the wall surface P to the diameter of the fan blade 20 and the size of the diameter D of the wall surface P are adjusted again, and the experiment is repeatedly carried out until the sound pressure level of the frequency band is reduced to a preset range, so that the purpose of improving the noise can be achieved.

In this way, and within the parameter range, the noise reduction plate 30 is installed and debugged, so that the sound pressure levels of the noises with different frequency bands can be reduced as required, and different noise reduction effects can be achieved, so as to meet different user requirements.

Optionally, the average thickness of the noise reduction plate 30 is 0.5mm to 4mm, and in this thickness range, the processing of the noise reduction plate 30 is facilitated.

Specifically, the noise reduction plate 30 has an average thickness of 0.5mm, 1mm, 2mm, 3mm, or 4 mm.

Referring to fig. 4 and 5 in combination, fig. 4 is a schematic structural diagram of a noise reduction plate of a centrifugal fan according to an embodiment of the present disclosure. Fig. 5 is a partial structural schematic diagram of a centrifugal fan according to an embodiment of the present application.

Optionally, the end portion of the inner casing 12 adjacent to the air inlet a is spaced apart from the outer casing 11, the noise reduction plate 30 includes an inner ring 31 and an outer ring 32, the outer ring 32 extends outward from one end of the inner ring 31, and the inner ring 31 is sleeved on the outer periphery of the end portion of the inner casing 12.

The inner ring 31 is sleeved on the outer periphery of the end of the inner housing 12, which means that the inner ring 31 is sleeved on the outer periphery of the end of the inner housing 12 close to the air inlet a.

The inner ring 31 is used for fixing the noise reduction plate 30, and the surface of the outer ring 32, which is close to the fan blade 20, is the wall surface P of the noise reduction plate 30, which is close to the fan blade 20.

Optionally, a surface of the outer ring 32 close to the fan blade 20 is parallel to the second bottom wall 1132, and a vertical distance between the surface of the outer ring 32 close to the fan blade 20 and the second bottom wall 1132 is 0-20 mm.

Specifically, the vertical distance between the surface of the outer ring 32 close to the fan blade 20 and the second bottom wall 1132 is 0mm, 5mm, 10mm, or 20 mm.

The surface of the outer ring 32 close to the fan blade 20 forms a complete circular wall surface P in the casing 10, which can change the airflow field inside the casing 10 and change the reflection and interference conditions of noise with specific frequency inside the casing 10, so that the superposition condition of the sound waves inside the casing 10 is improved.

Specifically, the reflection and interference conditions of the noises in different frequency bands can be changed by changing the size of the surface of the outer ring 32 close to the fan blade 20 and the distance between the surface of the outer ring 32 close to the fan blade 20 and the fan blade 20, so that different user requirements are met.

Specifically, inner housing 12 and outer housing 11 are coaxially disposed, and second bottom wall 1132 has a diameter smaller than that of first bottom wall 1131. The height of the connecting wall 114 relative to the first bottom wall 113 is smaller than the height of the side wall 112 relative to the first bottom wall 1131. The fan blade 20 is located on a side of the second bottom wall 1132, which is far away from the first bottom wall 1131, and the fan blade 20 and the second bottom wall 1132 are coaxially arranged.

Form through making the board 30 of making an uproar falls including inner ring 31 and outer loop 32 from inner ring 31 one end outwards extension to make inner ring 31 cover locate the tip periphery of interior casing 12, increased the whole area of contact with interior casing 12 of the board 30 of making an uproar falls, can make the cover that the board 30 of making an uproar falls that can stabilize more establish on interior casing 12. The noise reduction plate 30 is also easily mounted, adjusted and removed.

Referring to fig. 6, fig. 6 is a schematic partial exploded structural view of a centrifugal fan according to an embodiment of the present application.

Optionally, the noise reduction plate 30 is formed by detachably combining two

half rings

30a and 30b, the inner ring 31 is provided with a protrusion 33 at the joint of the two

half rings

30a and 30b, each protrusion 33 is provided with a through hole e along the circumferential direction of the inner ring 31, and the two

half rings

30a and 30b are locked by a locking device (not shown) matched with the through hole e of the protrusion 33 to form the noise reduction plate 30.

After the two

half rings

30a, 30b form the noise reduction plate 30, the two

half rings

30a, 30b can be fastened by screws (not shown) through the through holes e of the protrusions 33 of the

respective half rings

30a, 30b, and form a tightening force to be sleeved on the inner housing 12.

Specifically, the projection 33 may be provided on the outer circumferential wall of the inner ring 31.

Since the noise reduction plate 30 is formed by detachably combining the two

half rings

30a and 30b, the noise reduction plate 30 can be more conveniently mounted, adjusted and detached.

In other embodiments, the noise reduction plate 30 may be integrally formed. The noise reduction plate 30 may be secured to the inner housing 12 by other means, such as adhesive or ultrasonic welding.

Alternatively, the inner diameter of the inner ring 31 is 0.5mm to 2mm smaller than the outer diameter of the inner housing 12, so that a greater tightening force can be achieved after the two

ring halves

30a, 30b are locked to the inner housing 12. The inner diameter of the inner ring 31 may be, for example, 0.5mm, 0.8mm, 1.5mm, 2mm smaller than the outer diameter of the inner housing 12

The ventilator of the embodiment of the present application may include the centrifugal fan 100, the rectification component, and the humidification component described in any of the above embodiments. The centrifugal fan 100 is used for generating air flow, the rectifying component is used for rectifying the air flow generated by the centrifugal fan 100, and the humidifying component is used for humidifying the air flow. The air current can be used for the user to absorb through the external component after being humidified.

The embodiment of the application sets up the board 30 of making an uproar through falling in the wind channel c in centrifugal fan 100's casing 10, and make the board 30 of making an uproar fall for the loop configuration and the cover locates interior casing 12 periphery, the surface that the board 30 of making an uproar falls and is close to fan blade 20 is a complete wall P, wall P disturbs the gas that flows through wind channel c, thereby reduce the crest and the crest of specific frequency noise in the wind channel c, the emergence probability of mutual stack of trough and trough, consequently, can reduce the produced specific frequency noise of breathing machine, thereby reduce the interference of specific frequency noise to the user.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. The utility model provides a centrifugal fan, is applied to the breathing machine which characterized in that, centrifugal fan includes:

the air conditioner comprises a shell, a fan blade, a fan;

the fan blade is arranged in the air channel in the shell and is adjacent to the air inlet, and the fan blade is used for being connected to a motor shaft of a motor;

the noise reduction plate is of an annular structure and is sleeved on the periphery of the inner shell, the noise reduction plate is close to the surface of the fan blade and is a complete wall surface, and the wall surface is used for disturbing air flowing through the air duct so as to reduce mutual superposition of a wave crest, a wave trough and a wave trough of specific frequency noise in the air duct.

2. The centrifugal fan of claim 1, wherein the wall surface is perpendicular to a central axis of the fan blade.

3. The centrifugal fan of claim 1, wherein the diameter of the wall surface is 0.8-1.2 times the diameter of the fan blade.

4. The centrifugal fan of claim 1, wherein the wall has a diameter of 40mm to 60 mm.

5. The centrifugal fan as claimed in claim 1, wherein the vertical distance between the wall surface and the fan blade is 1mm-30 mm.

6. The centrifugal fan of claim 1, wherein the noise reduction plate has an average thickness of 0.5mm to 4 mm.

7. The centrifugal fan according to claim 1, wherein an end portion of the inner casing adjacent to the air inlet is spaced apart from the outer casing, the noise reduction plate includes an inner ring and an outer ring, the outer ring extends outward from one end of the inner ring, and the inner ring is sleeved on an outer periphery of the end portion of the inner casing.

8. The centrifugal fan according to claim 7, wherein the noise reduction plate is formed by detachably combining two half rings, the inner ring is provided with a protrusion at the joint of the two half rings, each protrusion is provided with a through hole along the circumference of the inner ring, and the two half rings are locked by a locking device matched with the through holes to form the noise reduction plate.

9. The centrifugal fan of claim 8, wherein the inner diameter of the inner ring is 0.5mm-2mm smaller than the outer diameter of the inner housing.

10. A respirator, characterized in that it comprises a centrifugal fan according to any one of claims 1-9.