Ventilator and Its Centrifugal Fan

Abstract

The present application discloses a ventilator and a centrifugal fan thereof. The centrifugal fan is applied to the ventilator. The centrifugal fan includes: a housing having an air inlet, an air duct, and an air outlet that are sequentially communicated; a blower wheel disposed in the air duct of the housing adjacent to the air inlet, and the blower wheel is used to be connected to the motor shaft of a motor; a noise reduction device disposed in the air duct of the housing for disturbing the gas flowing through the air duct to reduce the superposition of the peaks and peaks, and valleys and valleys of the noise at a specific frequency in the air duct. By the above method, the specific frequency noise generated by the ventilator can be reduced, thereby reducing the interference of the specific frequency noise to the user.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a ventilator and a centrifugal fan thereof. Background Art

[0002] In modern clinical medicine, as an effective means to artificially replace the function of autonomous ventilation, ventilators have been widely used in respiratory failure caused by various reasons, anesthesia respiratory management during major surgeries, respiratory support treatment, and first aid resuscitation, and play a very important role in the field of modern medicine. A ventilator is a crucial medical device that can prevent and treat respiratory failure, reduce complications, and save and extend the lives of patients. The centrifugal fan belongs to the noise source of the ventilator. Summary of the Invention

[0003] The main technical problem to be solved by this application is to provide a ventilator and a centrifugal fan thereof, which can reduce the specific frequency noise of the ventilator.

[0004] To solve the above technical problem, a technical solution adopted in an embodiment of this application is: to provide a centrifugal fan applied to a ventilator, the centrifugal fan includes: a housing, provided with an air inlet, an air duct, and an air outlet that are sequentially communicated; a fan blade, disposed in the air duct of the housing adjacent to the air inlet, and the fan blade is used to be connected to the motor shaft of the motor; a noise reduction device, disposed in the air duct of the housing, and used to disturb the gas flowing through the air duct to reduce the superposition of the peaks and peaks, valleys and valleys of the specific frequency noise in the air duct.

[0005] To solve the above technical problem, another technical solution adopted in an embodiment of this application is: to provide a ventilator, and the ventilator includes the above centrifugal fan.

[0006] In an embodiment of this application, by disposing a noise reduction device in the air duct of the centrifugal fan housing and using the noise reduction device to disturb the gas flowing through the air duct, the probability of the superposition of the peaks and peaks, valleys and valleys of the specific frequency noise in the air duct can be reduced. Therefore, the specific frequency noise generated by the ventilator can be reduced, thereby reducing the interference of the specific frequency noise to the user. Brief Description of the Drawings

[0007] Figure 1 is an exploded structural schematic diagram of the centrifugal fan according to an embodiment of this application;

[0008] Figure 2 is a partial structural schematic diagram of the centrifugal fan according to an embodiment of this application;

[0009] Figure 3 is a structural schematic diagram of the spoiler ring of the centrifugal fan according to an embodiment of this application;

[0010] Figure 4It is a partial exploded structure schematic diagram of the centrifugal fan according to an embodiment of the present application;

[0011] Figure 5 It is a schematic diagram of the noise test result of the centrifugal fan in the related art;

[0012] Figure 6 It is a schematic diagram of the noise test result of the centrifugal fan according to an embodiment of the present application. Detailed implementation manners

[0013] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. In addition, for the convenience of description, only parts related to the present application are shown in the accompanying drawings instead of all structures. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0014] The terms "first", "second", etc. in the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0015] Referring to "embodiment" herein means that a specific feature, structure or characteristic described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0016] Please refer to Figure 1 , Figure 1 It is an exploded structure schematic diagram of the centrifugal fan according to an embodiment of the present application.

[0017] In this embodiment, the centrifugal fan 100 is applied to a ventilator, and the centrifugal fan 100 includes: a housing 10, a wind blade 20, and a noise reduction device 30.

[0018] The housing 10 is provided with an air inlet a, an air duct c, and an air outlet b that are sequentially communicated.

[0019] The wind blade 20 is arranged in the air duct c of the housing 10 adjacent to the air inlet a, and the wind blade 20 is used to be connected to the motor shaft 41 of the motor 40.

[0020] A noise reduction device 30 is disposed in the air duct c of the housing 10 and is used to disturb the gas flowing through the air duct c, so as to reduce the superposition of the peaks and peaks, and valleys and valleys of the noise at a specific frequency in the air duct c.

[0021] The noise reduction device 30 can be fixedly connected to the inner surface of the housing 10.

[0022] The specific frequency noise refers to the noise in a specific frequency band, such as 100 Hz - 200 Hz, or 300 Hz - 400 Hz.

[0023] The inventors of the present application have found through long-term research and a large number of experiments that by disposing the noise reduction device 30 in the air duct c in the housing 10 of the centrifugal fan 100 and using the noise reduction device 30 to disturb the gas flowing through the air duct c, the probability of the superposition of the peaks and peaks, and valleys and valleys of the noise at a specific frequency in the air duct c can be reduced, so as to reduce the specific frequency noise generated by the centrifugal fan 100, thereby reducing the interference of the noise in the specific frequency band in the ventilator to the user.

[0024] Please continue to refer to Figure 1 . In this embodiment, the noise reduction device 30 includes a spoiler ring 31. The spoiler ring 31 is fixed between the impeller 20 and the air outlet b in the air duct c, and the plane defined by the spoiler ring 31 is perpendicular to the central axis of the impeller 20. That is to say, the spoiler ring 31 and the impeller 20 are arranged in parallel.

[0025] Furthermore, the spoiler ring 31 is of an annular structure, so that the motor shaft 41 of the motor 40 can pass through the middle of the spoiler ring 31 and then be connected to the impeller 20.

[0026] The spoiler ring 31 forms a wall surface inside the housing 10, which can change the airflow field inside the housing 10 and at the same time change the reflection and interference conditions of the noise at a specific frequency inside the housing 10, so as to improve the superposition situation of the sound waves inside the housing 10.

[0027] Please refer to in combination with Figures 1-3 , Figure 3 is a schematic structural diagram of the spoiler ring of the centrifugal fan according to the embodiment of the present application.

[0028] Optionally, the housing 10 includes an outer housing 11 and an inner housing 12. The inner housing 12 is located inside the outer housing 11, and at least a part of the air duct c is formed between the two. The spoiler ring 31 is sleeved on the outer periphery of the inner housing 12.

[0029] The housing 10 may include a top wall 111, a side wall 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 that is bent and connected to the first bottom wall 1131 and the second bottom wall 1132. The side wall 112 surrounds the connecting wall 114, and the connecting wall 114 and the second bottom wall 1132 enclose an inner housing 12 that protrudes toward the top wall 111 inside the housing 10. The inner housing 12 may be cylindrical.

[0030] 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 can be divided into two detachable upper and lower parts.

[0031] Please continue to refer to Figure 3 , the end of the inner housing 12 adjacent to the air inlet a is spaced from the outer housing 11. The spoiler ring 31 includes a fixed ring 311 and a plurality of spoiler blades 312. The plurality of spoiler blades 312 are fixedly spaced on the outer periphery of the fixed ring 311, and the fixed ring 311 is sleeved on the outer periphery of the end of the inner housing 12.

[0032] The plurality of spoiler blades 312 form a wall surface of a specific size and shape inside the housing 10, which can change the airflow field inside the housing 10 and simultaneously change the reflection and interference of noises with specific frequencies inside the housing 10, so as to improve the superposition of sound waves inside the housing 10.

[0033] Specifically, the plurality of spoiler blades 312 can change the reflection and interference of noises in different frequency bands by forming wall surfaces of different sizes and shapes, so as to meet the needs of different users.

[0034] Among them, the lengths of the spoiler blades 312 in the radial direction of the fixed ring 311 are different, and the sizes of the wall surfaces formed by the plurality of spoiler blades 312 are different; the angles formed between the surfaces of the spoiler blades 312 and the plane defined by the fixed ring 311 are different, and the shapes of the wall surfaces formed by the plurality of spoiler blades 312 are different. Therefore, by setting specific lengths and angles, the plurality of spoiler blades 312 form a wall surface of a specific size and shape inside the housing 10, and when different lengths and angles are set, the plurality of spoiler blades 312 can form wall surfaces of different sizes and shapes.

[0035] Specifically, the inner housing 12 and the outer housing 11 are coaxially arranged, and the diameter of the second bottom wall 1132 is smaller than the diameter of the first bottom wall 1131. The height of the connecting wall 114 relative to the first bottom wall 113 is less than the height of the side wall 112 relative to the first bottom wall 1131. The wind blade 20 is located on the side of the second bottom wall 1132 away from the first bottom wall 1131, and the wind blade 20 is coaxially arranged with the second bottom wall 1132.

[0036] By making the spoiler ring 31 include a fixed ring 311 and spoiler blades 312, and sleeving the fixed ring 311 on the outer periphery of the end of the inner housing 12, the contact area between the entire spoiler ring 31 and the inner housing 12 is increased, which can make the spoiler ring 31 more firmly sleeved on the inner housing 12. It is also convenient for the installation, adjustment and disassembly of the spoiler ring 31.

[0037] The inventors of the present application have found through long-term research and a large number of experiments that when the centrifugal fan 100 is in use, most users will feel uncomfortable with the noise in a specific frequency band, and the noise in this specific frequency band can be called "background noise". By measuring the noise spectrum of the centrifugal fan 100 during operation, the frequency band where the "background noise" is located is determined, such as the 100 Hz - 200 Hz frequency band. After setting the spoiler ring 31 in the air duct c in the housing 10 of the centrifugal fan 100, the noise spectrum of the centrifugal fan 100 during operation is measured again, and it is compared whether the sound pressure level in the "background noise" frequency band has changed. Then, the vertical distance between the plane defined by the spoiler ring 31 and the wind blade 20 is adjusted again, and the experiment is repeated until the sound pressure level in this frequency band is reduced to the preset range, so as to achieve the purpose of improving the "background noise". By installing in the above manner, the sound pressure level of the noise in different frequency bands in the ventilator can be reduced as needed to meet the different user requirements.

[0038] Optionally, the vertical distance between the plane defined by the spoiler ring 31 and the wind blade 20 is 1 mm - 30 mm. This vertical distance can be, for example, 1 mm, 5 mm, 10 mm, 20 mm, 30 mm.

[0039] Please further refer to Figure 4 , Figure 4 which is a partial exploded structural schematic diagram of the centrifugal fan according to the embodiment of the present application.

[0040] Optionally, the fixed ring 311 can be detachably composed of two half rings 31a and 31b. Convex blocks 313 are provided at the docking positions of the two half rings 31a and 31b. Each convex block 313 is provided with a through hole f along the circumferential direction of the fixed ring 311. The two half rings 31a and 31b are locked and combined into the fixed ring 311 through a locking device (not shown in the figure) that cooperates with the through hole f of the convex block 313.

[0041] After the two half rings 31a and 31b form the fixed ring 311, they can be locked by screws (not shown in the figure) passing through the through holes f of the convex blocks 313 of their respective half rings 31a and 31b, and a tightening force is formed to sleeve on the inner housing 12. Specifically, the convex blocks 313 can be provided on the outer peripheral wall of the fixed ring 311.

[0042] Since the fixed ring 311 is detachably composed of two half rings 31a and 31b, the installation, adjustment and disassembly of the fixed ring 311 can be more convenient.

[0043] In other embodiments, the fixing ring 311 can also be integrally formed. The fixing ring 311 can be fixed to the inner housing 12 by other means, such as glue or ultrasonic welding.

[0044] The inner diameter of the fixing ring 311 is 0.5 mm - 2 mm smaller than the outer diameter of the inner housing 12, so that a greater fastening force can be formed after the two half-rings 31a and 31b are locked on the inner housing 12. The inner diameter of the fixing ring 311 can be, for example, 0.5 mm, 1 mm, 1.5 mm or 2 mm smaller than the outer diameter of the inner housing 12.

[0045] Optionally, the wall thickness of the fixing ring 311 is 1 mm - 3 mm. The wall thickness of the fixing ring 311 can be, for example, 1 mm, 2 mm or 3 mm. The cross-sectional thickness of the spoiler blade 312 is 0.5 - 3 mm. The cross-sectional thickness of the spoiler blade 312 can be, for example, 0.5 mm, 0.8 mm, 1 mm, 2 mm, 2.5 mm or 3 mm.

[0046] Optionally, the spoiler blade 312 is inclined, and the inclination angle is between 30° and 80°. The inclination angle can be, for example, 30°, 40°, 50°, 70° or 80°.

[0047] The inclination angle of the spoiler blade 312 is the angle formed between the surface of the spoiler blade 312 and the plane defined by the fixing ring 311.

[0048] In order to achieve a better noise reduction effect, the inclination angle of the spoiler blade 312 can be 55° - 65°. The inclination angle of the spoiler blade 312 can be, for example, 55°, 58°, 60° or 65°.

[0049] In this embodiment, the shape of the surface of the spoiler blade 312 close to the wind blade 20 can be rectangular. In other embodiments, the shape of the surface of the spoiler blade 312 close to the wind blade 20 can be other shapes such as triangular, semi-circular, trapezoidal, etc.

[0050] The inclination angle of the spoiler blade 312 directly determines the influence on the air flow and sound waves. Through a large number of experiments in this application, the above more optimal inclination angle is obtained.

[0051] Optionally, the number of the spoiler blades 312 is 1 - 50. The number of the spoiler blades 312 can be, for example, 1, 5, 10, 20, 35, 40, 50.

[0052] When the number of the spoiler blades 312 is multiple, one ends of the multiple spoiler blades 312 are arranged at the outer periphery of the end of the fixing ring 311 at a preset interval.

[0053] Optionally, the length of the spoiler blade 312 in the radial direction of the fixed ring 311 is 1 mm to 50 mm. The length of the spoiler blade 312 in the radial direction of the fixed ring 311 can be, for example, 1 mm, 5 mm, 10 mm, 15 mm, 20 mm, 30 mm, 45 mm, or 50 mm. The length of the spoiler blade 312 in the radial direction of the fixed ring 311 may refer to the maximum length of the spoiler blade 312 in the radial direction of the fixed ring 311.

[0054] The shape and number of the spoiler blades 312 further determine the influence on the air flow and sound waves. Through a large number of experiments, the above-mentioned more optimal parameters are obtained in this application.

[0055] The following uses an experimental example to briefly illustrate the noise reduction effect of the centrifugal fan 100 in this embodiment:

[0056] In this experimental example, the noise in a specific frequency band: the 100 Hz to 200 Hz frequency band is mainly detected.

[0057] The experimental environment is: the acoustic laboratory of the Shenzhen Institute of Metrology and Quality Inspection, and the ambient noise is 10 dB.

[0058] Please refer to Figure 5 , Figure 5 which is a schematic diagram of the noise test results of the centrifugal fan in the related art.

[0059] The centrifugal fan in the related art is used as a control group: that is, a centrifugal fan without a spoiler ring is installed in the ventilator for testing, and a microphone (for receiving sound) is set 1 cm away from the air inlet of the ventilator (the noise at the air inlet in the 100 Hz to 200 Hz frequency band is more obvious).

[0060] The noise detection results of the control group are as Figure 5 shown.

[0061] Please refer to Figure 6 , Figure 6 which is a schematic diagram of the noise test results of the centrifugal fan in the embodiment of this application.

[0062] The centrifugal fan 100 in the embodiment of this application is used as an experimental group: the centrifugal fan 100 installed with the spoiler ring 31 is installed in the ventilator for testing, and a microphone (for receiving sound) is set 1 cm away from the air inlet of the ventilator (the noise at the air inlet in the 100 Hz to 200 Hz frequency band is more obvious).

[0063] The noise detection results of the experimental group are as Figure 6 shown.

[0064] Among them, Figure 5 and Figure 6 the abscissas in both are the noise frequency bands, and the ordinates in both are the noise decibels.

[0065] From Figure 5 and Figure 6 From the comparison above, it can be obtained that the noise of the control group (without the spoiler ring) is approximately 40 dB in the frequency band of 100 - 200 Hz, and the noise of the experimental group (with the spoiler ring 31) is approximately 35 dB in the frequency band of 100 - 200 Hz.

[0066] The experimental results show that the addition of the spoiler ring 31 can effectively reduce the noise in the frequency band of 100 - 200 Hz.

[0067] It should be noted that before the experiment, the spoiler ring 31 can be installed on the centrifugal fan 100 through the above installation method. Specifically: after setting the spoiler ring 31 in the air duct c in the housing 10 of the centrifugal fan 100, measure the noise spectrum of the centrifugal fan 100 during operation, compare whether there is a change in the sound pressure level in the frequency band of 100 Hz to 200 Hz, and then adjust the vertical distance between the plane defined by the spoiler ring 31 and the wind blade 20, and conduct the experiment repeatedly until the sound pressure level in this frequency band is reduced to the preset range, and use the centrifugal fan 100 installed with the spoiler ring 31 as the experimental group for the experiment.

[0068] In the embodiments of the present application, the thickness, specific quantity, and radial length of the spoiler blade 312 are not limited. Further, during use, by simultaneously adjusting the thickness, specific quantity, and radial length of the spoiler blade 312, the sound pressure level of the noise in different specific frequency bands inside the ventilator can be reduced, and different noise reduction effects can be achieved to meet different user requirements.

[0069] The ventilator in the embodiments of the present application includes the centrifugal fan 100, the rectifying component, and the humidifying component described in any of the above embodiments. Among them, the centrifugal fan 100 is used to generate air flow, the rectifying component is used to rectify the air flow generated by the centrifugal fan 100, and the humidifying component is used to humidify the air flow. After the air flow is humidified, it can be supplied to the user for inhalation through an external component.

[0070] The above is only the implementation manner of the present application, and does not limit the patent scope of the present application. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present application.

Claims

1. A centrifugal fan is applied to a ventilator. It is characterized in that the centrifugal fan comprises: a housing having an air inlet, an air duct and an air outlet that are sequentially communicated; a wind blade disposed in the air duct of the housing adjacent to the air inlet, and the wind blade is used to be connected to the motor shaft of a motor; a noise reduction device disposed in the air duct of the housing for disturbing the gas flowing through the air duct to reduce the superposition of the peaks and peaks, valleys and valleys of the noise at specific frequencies in the air duct; the noise reduction device includes a spoiler ring, the spoiler ring is fixed between the wind blade and the air outlet in the air duct, and the plane defined by the spoiler ring is perpendicular to the central axis of the wind blade. The spoiler ring is a ring structure, and the motor shaft of the motor passes through the middle of the spoiler ring and then is connected to the wind blade; the housing includes an outer housing and an inner housing, the inner housing is located inside the outer housing, and at least a part of the air duct is formed between the two; the spoiler ring is sleeved on the outer periphery of the inner housing; the end of the inner housing adjacent to the air inlet is spaced from the outer housing. The spoiler ring includes a fixing ring and a plurality of spoiler blades, the plurality of spoiler blades are fixedly spaced on the outer periphery of the fixing ring, and the fixing ring is sleeved on the outer periphery of the end of the inner housing; the spoiler blades are inclined, and the inclination angle is between 30° and 80°.

2. The centrifugal fan according to claim 1, it is characterized in that the perpendicular distance between the plane defined by the spoiler ring and the wind blade is 1 mm - 30 mm.

3. The centrifugal fan according to claim 1, it is characterized in that the fixing ring is composed of two semi-rings that are detachably combined. A convex block is provided at the docking portion of each semi-ring, and a through hole is provided in the circumferential direction of each convex block. The two semi-rings are locked by a locking device that cooperates with the through holes of the convex blocks to form the spoiler ring.

4. The centrifugal fan according to claim 1, it is characterized in that the inclination angle is between 55° and 65°.

5. The centrifugal fan according to claim 1, it is characterized in that the length of the spoiler blade in the radial direction of the fixing ring is 1 mm - 50 mm.

6. A ventilator, it is characterized in that the ventilator includes the centrifugal fan according to any one of claims 1-5 above.

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