Impeller, fan and ventilation therapy equipment for ventilation therapy equipment

Abstract

The present invention relates to the field of ventilation therapy equipment, and discloses an impeller, a fan, and a ventilation therapy equipment for ventilation therapy equipment. The impeller includes a wheel disc and a plurality of blades, the plurality of blades being arranged on one side surface of the wheel disc and spaced apart along the circumference of the wheel disc, a main flow channel for the flow of the medium being formed between two adjacent blades, a plurality of through holes corresponding to the plurality of main flow channels being provided on the wheel disc, the blades being provided so as to extend from the center of the wheel disc toward the edge of the wheel disc and terminate at the inner side of the edge, and the through holes being located between the ends of the blades and the edge in the radial direction of the wheel disc. The impeller of the present invention, on the one hand, can reduce the intensity of the impeller vortex shedding noise by providing a gap between the ends of the blades and the edge of the wheel disc; on the other hand, by providing a through hole on the wheel disc, the low-frequency noise can be greatly reduced. When the impeller of the present invention is applied to a fan, the noise reduction effect of the fan can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of ventilation therapy equipment, and in particular to an impeller for ventilation therapy equipment, a fan comprising the impeller, and ventilation therapy equipment comprising the fan. Background Art

[0002] The core component of ventilation therapy equipment is the small fan, which is also the source of the equipment's noise. The fan's blade structure plays a crucial role in determining the noise level. Specifically, during operation, the fan converts other forms of energy into mechanical energy for the impeller's rotation. The rotating impeller transfers this energy to the continuously flowing gas, achieving gas and energy transport. However, the high aerodynamic noise caused by the high-speed rotation of the impeller significantly restricts the fan's application. Therefore, reducing and controlling fan noise is particularly important.

[0003] Currently, many fan noise reduction methods rely on improvements to the volute. For example, by varying the volute spacing near the volute tongue, the airflow is directed to minimize eddy currents and resonance caused by air impact at different locations. However, this approach is not very effective and only works on specific impellers, making it less universal. Summary of the Invention

[0004] The object of the present invention is to address the above-mentioned problems and provide an impeller for ventilation therapy equipment, a fan including the impeller, and ventilation therapy equipment including the fan, so as to enhance the noise reduction effect of the fan by improving the structure of the impeller.

[0005] In order to achieve the above-mentioned objectives, the first aspect of the present invention provides an impeller for ventilation therapy equipment, wherein the impeller includes a wheel disc and a plurality of blades, wherein the plurality of blades are arranged on one side surface of the wheel disc and are arranged at intervals along the circumference of the wheel disc, and a main flow channel for medium flow is formed between two adjacent blades, and the wheel disc is provided with a plurality of through holes corresponding to the plurality of main flow channels, and the blades are arranged to extend from the center of the wheel disc toward the edge of the wheel disc and terminate on the inner side of the edge, and the through holes are located between the tips of the blades and the edge in the radial direction of the wheel disc.

[0006] Optionally, each main channel is provided with a splitter blade extending in the same direction as the corresponding blade, the length of the splitter blade is smaller than the length of the blade, and the end of the splitter blade is flush with the end of the blade to separate the outlet of the main channel into two splitter channels.

[0007] Optionally, the splitter blade is located on the center line of the main channel, each main channel corresponds to one through hole, and the center of the through hole is located on the extension line of the splitter blade.

[0008] Optionally, the through hole is a circular hole, and the diameter of the through hole is 20%-60% of the outlet width of the branch channel; or

[0009] The through hole is a strip-shaped hole, and the length of the through hole is equal to the outlet width of the branch channel.

[0010] Optionally, the splitter blades are located on the center lines of the main flow channels, each main flow channel corresponds to two through holes, and the centers of the two through holes are respectively located on the center lines of the two splitter channels.

[0011] Optionally, the through hole is a circular hole, and the diameter of the through hole is 25%-65% of the outlet width of the branch channel; or

[0012] The through hole is a strip-shaped hole, and the length of the through hole is smaller than the outlet width of the branch channel.

[0013] Optionally, the blades are twisted counterclockwise outward along the radial direction of the wheel disc.

[0014] Optionally, the impeller includes a hub, which is arranged at the center of the wheel disc for connecting to the motor shaft.

[0015] A second aspect of the present invention provides a fan for ventilation therapy equipment, the fan comprising a housing, a motor and the impeller described above, the impeller and the motor being installed in the housing, and the motor being connected to the impeller to drive the impeller to rotate.

[0016] A third aspect of the present invention provides a ventilation therapy device, which includes the blower described above.

[0017] The impeller of the present invention, on the one hand, reduces the effective radius of the impeller by providing a gap between the tips of the blades and the edge of the disc, thereby reducing the airflow velocity within the impeller flow channel and thereby reducing the intensity of the impeller vortex shedding noise. On the other hand, by providing through holes in the disc, the through holes can break up the large vortices formed at the outlet of the main flow channel into small vortices or eliminate them. Since large vortices are the source of low-frequency noise, low-frequency noise can be significantly reduced. When the impeller of the present invention is applied to a fan, it can effectively improve the fan's noise reduction effect.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 is a perspective view of a first embodiment of an impeller in the present invention;

[0021] Figure 2 is a perspective view of a second embodiment of the impeller of the present invention;

[0022] Figure 3 is a perspective view of a third embodiment of an impeller in the present invention;

[0023] Figure 4 It is a perspective view of a fourth embodiment of an impeller in the present invention.

[0024] Description of Reference Numerals

[0025] 1-wheel disc, 2-blade, 3-diverter blade, 4-main channel, 5-diverter channel, 6-through hole, 7-hub. DETAILED DESCRIPTION

[0026] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0027] A first aspect of the present invention provides an impeller for a ventilation therapy device, the impeller comprising a wheel disc 1 and a plurality of blades 2, the plurality of blades 2 being arranged on a side surface of the wheel disc 1 and spaced apart along the circumference of the wheel disc 1, a main flow channel 3 for medium flow being formed between two adjacent blades 2, the wheel disc 1 being provided with a plurality of through holes 6 corresponding to the plurality of main flow channels 3, the blades 2 being arranged to extend from the center of the wheel disc 1 toward the edge of the wheel disc 1 and terminating on the inner side of the edge, the through holes 6 being located between the ends of the blades 2 and the edge in the radial direction of the wheel disc 1.

[0028] It should be noted that the aforementioned disc 1 is provided with multiple through-holes 6 corresponding to the multiple main flow channels 3, meaning that the through-holes 6 are located between two adjacent blades 2 in the circumferential direction of the disc 1, and each main flow channel 3 may correspond to one or more through-holes 6. The aforementioned blades 2 are arranged to extend from the center of the disc 1 toward the edge of the disc 1 and terminate inboard of the edge, meaning that there is a gap between the tip of the blade 2 and the edge of the disc 1. The size of the gap between the tip of the blade 2 and the edge of the disc 1 can be adaptively adjusted based on the shape and size of the through-holes 6.

[0029] In the present invention, the impeller is a centrifugal impeller, which can suck gas from the axial direction of the impeller and then use centrifugal force to throw the gas out from the circumferential direction of the impeller. Through research, it is found that the trailing edge noise of centrifugal impellers can be roughly divided into two categories: turbulent boundary layer-trailing edge noise (TBL-TE Noise) and laminar boundary layer-vortex shedding noise (LBS-VS Noise). Among them, the centrifugal impeller uses vortex shedding noise as the main noise source of the impeller rotation, and its vortex shedding noise intensity F i The estimation formula is:

[0030] F i =S r *u*i / L

[0031] Among them, S r is the Strouhal number, which represents the ratio of the inertial force of unsteady motion to the inertial force; u = w*r, where u is the air velocity in the impeller flow channel, w is the linear velocity of the impeller rotation, and r is the effective radius of the impeller (i.e., the radius from the center of the impeller to the end of the blade); i is the harmonic sequence number; and L is the orthographic projection area of ​​the blade.

[0032] The impeller of the present invention can reduce the airflow velocity in the impeller flow channel by providing a gap between the end of the blade 2 and the edge of the wheel disc 1, thereby reducing the effective radius of the wheel disc 1 and reducing the intensity of the impeller vortex shedding noise. In addition, since the airflow forms a large vortex at the outlet of the main channel 3 during the operation of the impeller, the present invention provides the gap and the through hole 6 on the wheel disc 1. The presence of the gap can make the shedding point of the large vortex move to the outside of the wheel disc 1, and the presence of the through hole 6 can make the large vortex move from the high-pressure surface (i.e., the side of the wheel disc 1 with blades 2) near the through hole 6 at the outlet of the main flow channel 3 to the low-pressure surface (i.e., the side of the wheel disc 1 without blades 2), thereby being broken up into small vortices or eliminated. Since the large vortex is the source of low-frequency noise, it can greatly reduce low-frequency noise. When the impeller of the present invention is applied to a fan, it can effectively improve the noise reduction effect of the fan, and since the noise reduction of the fan comes from the improvement of the impeller structure, it has high versatility.

[0033] In the present invention, in order to prevent the vortex formed at the outlet of the main channel 3 from being too large, a diverter blade 4 extending in the same direction as the corresponding blade 2 (i.e., the blade 2 used to define the corresponding main channel 3) can be provided in each main channel 3. The length of the diverter blade 4 is less than the length of the blade 2, and the end of the diverter blade 4 is flush with the end of the blade 2, so as to separate the outlet of the main channel 3 (i.e., the end of the main channel 3 close to the edge of the wheel) into two diverter channels 5.

[0034] Among them, in order to balance the airflow of the two branch channels 5, reduce the aerodynamic impact on the blades, and prevent the impeller from becoming unstable, it is best to locate the branch blade 4 on the center line of the main channel 3, that is, the branch blade 4 divides the outlet of the main channel 3 into two branch channels 5.

[0035] In the present invention, regarding the arrangement of the through hole 6, according to one embodiment of the present invention, as Figure 2 and Figure 4 As shown, each main channel 3 may correspond to a through hole 6. This approach can reduce the number of holes in the wheel 1, improve the strength of the wheel, and simplify the manufacturing process. In this case, it is preferred that the center of the through hole 6 is located on the extension line of the splitter blade 4, so that the large vortices in the two split channels 5 can be broken up into small vortices or eliminated through the through hole 6. The through hole 6 can be of any shape. For example Figure 2 As shown, the through hole 6 can be a circular hole, and the diameter of the through hole 6 can be 20%-60% of the outlet width of the diverter 5, preferably 50%. For example, the outlet width of the diverter 5 is 4mm, and the diameter of the through hole 6 is 2mm. By setting the through hole 6 as a circular hole, the effective punching area can be reduced, the degree of damage to the strength of the wheel disc 1 can be reduced, and the requirements for the material used in the wheel disc 1 can be reduced. For another example Figure 4 As shown, the through hole 6 can be a strip-shaped hole. In this case, the length of the through hole 6 can be preferably equal to the outlet width of the branch channel 5 to further improve the noise reduction effect. By setting the through hole 6 as a strip-shaped hole, the processing technology of the small-sized impeller can also be simplified.

[0036] According to another embodiment of the present invention, Figure 1 and Figure 3 As shown, each main channel 3 can correspond to two through holes 6, so that the gas coming out of each branch channel 5 has a separation point moved backward, which can improve the noise reduction effect. In this case, it is preferred that the centers of the two through holes 6 are located on the center lines of the two branch channels 5 to further improve the noise reduction effect. The through holes 6 can be of any shape. For example Figure 1 As shown, the through hole 6 may be a circular hole. In this case, the diameter of the through hole 6 may preferably be 25%-65% of the outlet width of the branch channel 5. For example Figure 3 As shown, the through hole 6 can be a strip-shaped hole. In this case, the length of the through hole 6 can be preferably made smaller than the outlet width of the branch channel 5. Such a strip-shaped hole increases the hole area compared to a circular hole, so that the horizontal area formed by the separation point is no longer an independent area formed by a single branch channel, which can further improve the noise reduction effect.

[0037] In the present invention, the blades 2 may extend in a straight line or in a curve along the radial direction of the wheel disc 1. Figures 1-4 , the blades 2 are twisted counterclockwise outward along the radial direction of the wheel disc 1.

[0038] In the present invention, the impeller may further include a hub 7 , which is disposed at the center of the wheel disc 1 for connecting to a motor shaft.

[0039] It should also be noted that the high-frequency noise generated by the small volutes formed during the rotation of the impeller can be eliminated by using sound-absorbing cotton. Sound-absorbing cotton is a porous medium. The vibrations generated by airflow passing through the porous structure inside the cotton can convert the high-frequency noise into heat, thereby absorbing the high-frequency noise. The sound-absorbing cotton can be installed in the pipe connected to the outlet of the fan housing.

[0040] A second aspect of the present invention provides a fan for ventilation therapy equipment, the fan comprising a housing, a motor and the impeller described above, the impeller and the motor being installed in the housing, and the motor being connected to the impeller to drive the impeller to rotate.

[0041] The fan is a centrifugal fan, which can be used in any desired device. The impeller can be connected to the rotating shaft of the motor through the hub 7 provided on the wheel disc 1, so that the motor can drive the impeller to rotate.

[0042] A third aspect of the present invention provides a ventilation therapy device, which includes the blower described above.

[0043] The ventilation therapy equipment may be a ventilator, an oxygen therapy device, etc.

[0044] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0045] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0046] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An impeller for ventilation therapy equipment, characterized in that: The impeller comprises a wheel disc (1) and a plurality of blades (2), wherein the plurality of blades (2) are arranged on a side surface of the wheel disc (1) and are arranged at intervals along the circumference of the wheel disc (1), and a main flow channel (3) for medium flow is formed between two adjacent blades (2), and the wheel disc (1) is provided with a plurality of through holes (6) corresponding to the plurality of main flow channels (3), and the blades (2) are arranged to extend from the center of the wheel disc (1) toward the edge of the wheel disc (1) and terminate at the inner side of the edge, and the through holes (6) are located between the ends of the blades (2) and the edge in the radial direction of the wheel disc (1).

2. The impeller according to claim 1, characterized in that Each of the main flow channels (3) is provided with a splitter blade (4) extending in the same direction as the corresponding blade (2); the length of the splitter blade (4) is less than the length of the blade (2), and the end of the splitter blade (4) is flush with the end of the blade (2), so as to separate the outlet of the main flow channel (3) into two splitter channels (5).

3. The impeller according to claim 2, characterized in that The splitter blade (4) is located on the center line of the main channel (3), each main channel (3) corresponds to one through hole (6), and the center of the through hole (6) is located on the extension line of the splitter blade (4).

4. The impeller according to claim 3, characterized in that The through hole (6) is a circular hole, and the diameter of the through hole (6) is 20%-60% of the outlet width of the branch channel (5); or The through hole (6) is a strip-shaped hole, and the length of the through hole (6) is equal to the outlet width of the branch channel (5).

5. The impeller according to claim 2, characterized in that The splitter blade (4) is located on the center line of the main flow channel (3), each main flow channel (3) corresponds to two through holes (6), and the centers of the two through holes (6) are respectively located on the center lines of the two splitter channels (5).

6. The impeller according to claim 5, characterized in that The through hole (6) is a circular hole, and the diameter of the through hole (6) is 25%-65% of the outlet width of the branch channel (5); or The through hole (6) is a strip-shaped hole, and the length of the through hole (6) is smaller than the outlet width of the branch channel (5).

7. The impeller according to any one of claims 1 to 6, characterized in that: The blades (2) are twisted counterclockwise outward along the radial direction of the wheel disc (1).

8. The impeller according to any one of claims 1 to 6, characterized in that: The impeller comprises a hub (7), and the hub (7) is arranged at the center of the wheel disc (1) for connecting to the motor shaft.

9. A fan for ventilation therapy equipment, characterized in that: The fan includes a housing, a motor, and the impeller according to any one of claims 1 to 8. The impeller and the motor are installed in the housing, and the motor is connected to the impeller to drive the impeller to rotate.

10. A ventilation therapy device, characterized in that: The ventilation therapy device includes the blower according to claim 9.

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