Low-noise turbofan and breathing machine with same

Abstract

The invention provides a low-noise turbofan and a breathing machine with the low-noise turbofan. The low-noise turbofan comprises a volute, an impeller and a motor. An axial air inlet is formed in the top of the volute, and a tangential air outlet is formed in the side face of the volute. The annular blocking piece is arranged in the volute and comprises a body, an extending part and an air blocking part, the body is located on the edge of the air outlet and outwards forms the extending part in the radial direction, and the extending part extends into the air outlet; the air blocking part is arranged on the extending part, gaps are formed between the body, the extending part and the volute and between the air blocking part and the volute, and airflow guided out by the impeller is allowed to enter the air outlet through the gaps. According to the vortex fan, the extending part and the wind blocking part are arranged on the annular blocking piece at the same time, the vortex phenomenon of airflow at the air outlet of the vortex fan in the prior art can be improved, the flow resistance of the outlet of the fan is reduced, and therefore the noise of the vortex fan is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of turbo blowers, and in particular to a low-noise turbo blower and a ventilator having the same. Background Art

[0002] A ventilator is an external respiratory gas source device for respiratory therapy or assisted ventilation. The turbine blower is one of the core components of the ventilator. The flow and pressure required by the ventilator come from the turbine blower. The pressure, flow and noise performance of the turbine blower are directly related to the performance of the ventilator. Medical emergency ventilators mainly focus on maintaining and restoring the functions of special respiratory physiology diagnosis, and have a relatively high tolerance for noise. Home ventilators are often used in non-emergency situations, such as for the improvement of sleep apnea syndrome. Users have a more stringent tolerance for noise and hope that the ventilator will not cause noise interference to ensure a quiet sleeping environment.

[0003] The turbine fan is the main source of ventilator noise. The noise surface of the ventilator is emitted by the turbine fan itself, and the air flow will also spread and generate noise when passing through the air duct of the turbine fan. Therefore, how to reduce the noise of the turbine fan is a research hotspot in this field. For example, the Chinese patent with publication number CN220396093U discloses a low-noise turbine fan and ventilator, which is designed with an annular cover at the outlet of the volute upper cover plate to block the outward propagation of the impeller outlet noise. The impeller airflow flows from the gap between the annular baffle and the annular cover to the outlet channel below, and then spreads to the entire air outlet after passing through the lower outlet channel, thereby achieving low noise. However, this structure will cause part of the airflow to impact the wall of the upper volute outlet and form a vortex, thereby increasing the fan noise, and the noise reduction effect is limited. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a low-noise turbine blower and a ventilator having the same, which can solve the problem in the prior art that the vortex blower structure causes part of the air flow to impact the wall of the upper volute outlet and form a vortex.

[0005] In order to achieve the above objectives and other objectives, the present invention is implemented by including the following technical solutions: As a first aspect, the present invention proposes a low-noise turbine fan, including a volute, an impeller and a motor; the top of the volute is provided with an axial air inlet and the side is provided with a tangential air outlet; the motor is mounted on the volute; the impeller is arranged inside the volute and is fixedly connected to the output shaft of the motor; it also includes an annular baffle, which is arranged inside the volute, including a main body, an extension part and a wind shield part, the edge of the main body is located at the air outlet and the extension part is formed radially outward, and the extension part extends into the air outlet; the wind shield part is arranged on the extension part, and a gap is formed between the main body, the extension part and the wind shield part and the volute, allowing the airflow derived from the impeller to enter the air outlet through the gap.

[0006] In one embodiment, the length of the extension portion does not exceed the length of the air outlet; and the width of the wind shield portion does not exceed the width of the extension portion.

[0007] In one embodiment, the wind shield is vertically arranged at the junction of the extension portion and the main body.

[0008] In one embodiment, a guide plate is provided on the extension portion, and an arrangement direction of the guide plate is parallel to an extension direction of the extension portion.

[0009] In one embodiment, two windshields are provided, one windshield is vertically provided at the junction of the extension portion and the main body; the other windshield is obliquely provided on the end of the extension portion away from the main body, and the angle between the other windshield and the extension portion is an obtuse angle.

[0010] In one embodiment, the windshield is obliquely arranged at the junction of the extension and the main body; or the windshield is obliquely arranged on the end of the extension away from the main body, and the angle between the windshield and the extension is an obtuse angle.

[0011] In one embodiment, the inclined wind shield is arranged to fit in with the inner wall surface of the air inlet.

[0012] In one embodiment, the diameter of the body is 1.2 to 1.5 times the diameter of the impeller.

[0013] In one embodiment, the axial gap between the main body and the lower cover plate of the impeller is 0.5 mm to 2 mm.

[0014] As a second aspect, the present invention provides a ventilator comprising the low-noise turbine blower as described in the first aspect.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The vortex fan provided by the present invention can improve the vortex phenomenon of the airflow at the air outlet of the vortex fan in the prior art by simultaneously providing an extension portion and a wind shield portion on the annular baffle, thereby reducing the flow resistance at the fan outlet and thus reducing the noise of the turbine fan. At the same time, this design can be implemented through simple mold modification without changing the appearance and performance of the turbine fan, and the improvement cost is low.

[0017] 2. Compared with the prior art, the size design of the annular baffle of the present invention can significantly improve the noise reduction effect of the fan at the expense of part of the fan flow;

[0018] 3. The axial gap between the main body of the annular baffle and the lower cover plate of the impeller is small, which can control the turbulent noise in the cavity of the lower cover plate of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a schematic diagram of the appearance structure of the low-noise turbine blower of the present invention.

[0020] Figure 2 Shown is a cross-sectional view of a low-noise turbine fan according to the present invention.

[0021] Figure 3 Shown is a schematic cross-sectional view of a low-noise turbine blower at the center of the air outlet according to the present invention.

[0022] Figure 4 It is a schematic structural diagram of the first embodiment of the annular baffle in the present invention.

[0023] Figure 5 It is a schematic structural diagram of a second embodiment of the annular baffle in the present invention.

[0024] Figure 6 It is a schematic structural diagram of a third embodiment of the annular baffle in the present invention.

[0025] Figure 7 It is a schematic structural diagram of a fourth embodiment of the annular baffle in the present invention.

[0026] Figure 8 It is a schematic structural diagram of a fifth embodiment of the annular baffle in the present invention.

[0027] Figure 9 It is a schematic structural diagram of a sixth embodiment of the annular baffle in the present invention.

[0028] Figure 10 It is a schematic structural diagram of the seventh embodiment of the annular baffle in the present invention.

[0029] Figure 11 It is a schematic structural diagram of the eighth embodiment of the annular baffle in the present invention.

[0030] Figure 12 Shown is a schematic diagram of the simulation workflow of Example 1.

[0031] Figure 13 Shown is a schematic diagram of the simulation workflow of Comparative Example 1.

[0032] Figure 14 Shown is a schematic structural diagram of Comparative Example 2.

[0033] Figure 15 Shown is a schematic diagram of the simulation workflow of Comparative Example 2.

[0034] Figure 16 Shown is a schematic structural diagram of the annular baffle in Comparative Example 3.

[0035] Figure 17 Shown is a schematic diagram of the simulation workflow of Comparative Example 3. DETAILED DESCRIPTION

[0036] See also Figures 1-17 The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0037] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by those skilled in the art. They are not intended to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0038] In the present invention, component numbers, such as "first," "second," and so on, are used solely to distinguish the objects being described and do not connote any sequential or technical meaning. As used herein, "connected," unless otherwise specified, includes both direct and indirect connections. The terms "include," "comprising," or any other variations thereof are intended to encompass a non-exclusive inclusion, encompassing not only the listed elements but also other elements not specifically listed.

[0039] (Example 1)

[0040] like Figure 1 and Figure 3 As shown, this embodiment provides a low-noise turbine blower, including a volute 100 , an impeller 200 , an annular baffle 300 and a motor 400 .

[0041] The volute 100 includes an upper volute 110 and a lower volute 120 , which are sealed and connected by snap fastening, screw fastening, ultrasonic welding or other installation methods to form an accommodating space for installing the impeller 200 and the annular baffle 300 . The air outlet of the upper volute 110 is not provided with a wind shield, and an air inlet 130 is provided at the top. A circle of sinking rings 131 is provided vertically downward in the circumference of the air inlet 130; the sinking ring 131 is inserted into the inlet of the impeller 200. After the guiding effect of the sinking ring 131, the airflow of the air inlet 130 flows into the impeller 200 from the inlet. After the airflow flows out from the outlet of the impeller 200, it flows back through the annular gap 112 between the top of the impeller 200 and the inner wall of the upper volute 110. Under the guiding effect of the sinking ring 131, the reflux airflow enters the impeller 200 vertically, effectively reducing the reflux noise. A mounting hole is provided in the middle of the lower volute 120. The mounting hole protrudes toward the inside of the volute 100 to form a mounting shoulder. The motor 400 is mounted on the outside of the mounting shoulder. The mounting shoulder has a plurality of threaded holes evenly distributed thereon for mounting the annular baffle 300 and the motor 400 .

[0042] The volute 100 is provided with an air outlet 140 on its side. The axis of the air outlet 140 is offset toward the fan axis. Proper space is left on one side of the air outlet 140 to reduce the overall space occupied by the air outlet 140 when external piping is connected. Preferably, the axis of the air outlet 140 is offset 1 to 3 mm toward the fan axis, which has minimal impact on the overall performance of the fan.

[0043] Furthermore, the inner transition surface 111 of the upper volute 110 is a large R-angle transition, so that the angle of attack between the outlet airflow of the impeller 200 and the upper volute 110 is small, which is beneficial to reducing airflow impact noise.

[0044] The center of the impeller 200 is connected to the output shaft of the motor 400. The gap between the upper end cover of the motor 400 and the lower cover of the impeller 200 is as small as possible to reduce turbulence in the cavity of the lower cover of the impeller 200 and thus reduce noise. The structure of the impeller 200 can adopt the impeller structure disclosed in Chinese Patent Publication No. CN220396093U to improve the uniformity of the airflow at the impeller 200 outlet, reduce airflow noise caused by airflow fluctuations, and reduce the impact noise between the airflow at the impeller 200 outlet and the wall of the volute 100. The specific structure is not repeated here.

[0045] like Figure 4As shown, the annular baffle 300 is disposed inside the volute 100 and forms a gap 113 with the inner wall of the volute 100 , allowing the outlet airflow of the impeller 200 to enter the air outlet 140 through the gap 113 .

[0046] Specifically, the annular baffle 300 includes an integrally formed main body 310, an extension 320, and a windshield 330. The main body 310 is a circular ring with a central through hole. The extension 320 is formed radially outward on the edge of the main body 310 located at the air outlet 140 of the upper turbine 110. The extension 320 extends into the air outlet 140, and the length of the extension 140 does not exceed the length of the air outlet 140. The windshield 330 is vertically arranged at the junction of the main body 310 and the extension 140. The shape of the windshield 330 matches the shape of the air outlet 140 of the upper turbine 110, and the gap 113 is formed between the windshield 330 and the inner wall surface of the air outlet 140 of the upper turbine 110. In this embodiment, the width of the extension portion 320 is greater than the width of the wind shield portion 330, that is, one end of the wind shield portion 330 on the main body 310 is arranged to intersect with one end of the extension portion 320 on the main body 310, and the other end of the wind shield portion 330 on the main body 310 is located between the two ends of the extension portion 320 on the main body 310; the outer end surface 321 of the extension portion 320 is a plane.

[0047] Please refer to Figure 12 and Figure 13 , the workflow of this embodiment and comparative example 1 was simulated using simulation technology, and the Figure 13 It can be seen that a part of the airflow in comparative example 1 will impact the wall surface of the upper volute outlet to form a vortex, and the formation of the vortex causes a large turbulence at the outlet of the turbine fan, thereby generating noise; Figure 12 It can be seen that the design of this embodiment can eliminate the impact of the airflow at the air outlet on the wall surface of the volute air outlet, eliminate the vortex at the air outlet, and reduce the airflow noise caused by airflow turbulence.

[0048] Furthermore, after multiple tests, it was found that when the diameter of the main body 310 can be 1.2 to 1.5 times the diameter of the impeller 200, and when the diameter of the main body 310 is expanded to 1.3 times the diameter of the impeller 200, the flow rate of the fan only decreases by about 9%. Therefore, further considerable noise reduction effect can be obtained at the expense of part of the fan flow rate.

[0049] Furthermore, the axial clearance between the body 310 and the lower cover plate of the impeller 200 is 0.5 mm to 2 mm. The smaller axial clearance can control the turbulent noise in the cavity of the lower cover plate of the impeller 200.

[0050] (Example 2)

[0051] like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that the width of the extension portion 320 is equal to the width of the wind shield portion 330, that is, both ends of the wind shield portion 330 on the main body 310 intersect with both ends of the extension portion 320 on the main body 310; the outer end surface 321 of the extension portion is an arc surface bent outward.

[0052] (Example 3)

[0053] like Figure 6 As shown, the difference between this embodiment and embodiment 2 is that the outer end surface 321 of the extension portion is an inwardly curved arc surface.

[0054] (Example 4)

[0055] like Figure 7 As shown, this embodiment differs from Embodiment 1 in that the width of the extension portion 320 is equal to the width of the windshield portion 330, that is, both ends of the windshield portion 330 on the body 310 intersect with both ends of the extension portion 320 on the body 310. In addition, a deflector 322 is provided on the upper end surface of the extension portion 320, and the arrangement direction of the deflector 322 is parallel to the extension direction of the extension portion 320.

[0056] (Example 5)

[0057] like Figure 8 As shown, the difference between this embodiment and embodiment 4 is that the guide plates 322 are symmetrically arranged on the upper end surface and the lower end surface of the extension portion 320.

[0058] (Example 6)

[0059] like Figure 9 As shown, the difference between this embodiment and embodiment 2 is that two wind shields 330 are provided, one wind shield 330 is vertically arranged at the junction of the extension portion 320 and the main body 310; the other wind shield 330 is obliquely arranged on the end of the extension portion 320 away from the main body 310, and the angle between the other wind shield 330 and the extension portion 320 is an obtuse angle.

[0060] (Example 7)

[0061] like Figure 10 As shown, the difference between this embodiment and embodiment 2 is that the wind shielding portion 330 is obliquely arranged at the junction of the extension portion 320 and the main body 310 .

[0062] (Example 8)

[0063] like Figure 11As shown, the difference between this embodiment and embodiment 7 is that the wind shielding portion 330 is obliquely arranged on the end of the extension portion 320 away from the main body 310, and the angle between the wind shielding portion 330 and the extension portion 320 is an obtuse angle.

[0064] It should be noted that the inclined wind shield 330 may be disposed in close contact with the inner wall surface of the air inlet 140 .

[0065] (Comparative Example 1)

[0066] Comparative Example 1 uses a low-noise turbine blower disclosed in Chinese Patent Publication No. CN220396093U. The upper volute of Comparative Example 1 is equipped with a windshield at the air outlet. The windshield and the lower portion of the upper volute form an annular cover. Furthermore, the annular shield in Comparative Example 1 is simply an annular plate with a central through-hole.

[0067] like Figure 13 As shown in the figure, the working streamline of comparative example 1 is simulated using simulation technology. It can be seen from the figure that part of the airflow flows out from the gap formed by the annular cover and the volute and flows out directly from the outlet of the lower volute, while the other part of the airflow will collide with the inner wall of the upper volute outlet and form a vortex before flowing out. The formation of the vortex causes greater turbulence at the outlet of the turbine fan, thereby generating noise.

[0068] (Comparative Example 2)

[0069] like Figure 14 As shown, the air outlet of the upper volute of the turbo blower provided in Comparative Example 2 is provided with a wind shield portion. Meanwhile, only an extension portion 320 is added to the body 310 of the annular baffle used in Comparative Example 2.

[0070] like Figure 15 As shown, the working streamline of comparative example 2 is simulated using simulation technology. It can be seen from the figure that part of the airflow in comparative example 2 will still form a vortex after impacting the upper volute outlet wall and then flow out.

[0071] (Comparative Example 3)

[0072] like Figure 16 As shown, the upper volute of the vortex blower provided in Comparative Example 3 has no wind shield, and only a vertical wind shield 330 is added to the body 310 of the annular baffle.

[0073] like Figure 17 As shown in FIG, the working streamline of comparative example 3 is simulated by simulation technology. From the figure, it can be seen that there is a large vortex near the air outlet of comparative example 3. Compared with the air outlet streamline of the vortex fan using embodiment 1 as the annular baffle (as shown in FIG Figure 12 ), the vortex near the air outlet of the vortex fan of Example 1 is suppressed, and the vortex is reduced and becomes smaller.

[0074] In summary, the annular baffle 300 design of the low-noise turbine fan provided by the present invention, on the one hand, by adding the wind shield 330, blocks the path of the airflow noise at the impeller 200 outlet directly propagating to the turbine fan outlet 140 while guiding the airflow; on the other hand, by adding the extension portion 320, the airflow flowing out from the gap 113 between the wind shield 330 and the upper turbine 110 is separated from the airflow flowing out from the gap 113 between the main body 310 and the volute 100, which can effectively reduce the airflow turbulence at the turbine fan outlet and eliminate the vortex above the turbine fan outlet, thereby further achieving fan noise reduction.

[0075] Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial value. The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by persons of ordinary skill in the art without departing from the spirit and technical concepts disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A low-noise turbine fan, comprising a volute, an impeller and a motor; the top of the volute is provided with an axial air inlet, and the side is provided with a tangential air outlet; the motor is mounted on the volute; the impeller is arranged inside the volute and fixedly connected to the output shaft of the motor, characterized in that: Also includes An annular baffle is arranged inside the volute, and includes a main body, an extension portion and a wind shield portion. The main body is located at the edge of the air outlet and is formed with the extension portion radially outward, and the extension portion extends into the air outlet; the wind shield portion is arranged on the extension portion, and a gap is formed between the main body, the extension portion and the wind shield portion and the volute, allowing the airflow derived from the impeller to enter the air outlet through the gap.

2. The low noise turbo blower according to claim 1, characterized in that: The length of the extension portion does not exceed the length of the air outlet; and the width of the wind shield portion does not exceed the width of the extension portion.

3. The low noise turbo blower according to claim 2, characterized in that: The wind shielding portion is vertically arranged at the junction of the extending portion and the main body.

4. The low noise turbo blower according to claim 3, characterized in that: A guide plate is arranged on the extension portion, and an arrangement direction of the guide plate is parallel to an extension direction of the extension portion.

5. The low noise turbo blower according to claim 2, characterized in that: There are two windshields, one of which is vertically arranged at the junction of the extension and the main body; the other windshield is obliquely arranged on the end of the extension away from the main body, and the angle between the other windshield and the extension is an obtuse angle.

6. The low noise turbo blower according to claim 2, characterized in that: The wind shielding portion is obliquely arranged at the junction of the extension portion and the main body; or the wind shielding portion is obliquely arranged at the end of the extension portion away from the main body, and the angle between the wind shielding portion and the extension portion is an obtuse angle.

7. The low noise turbo blower according to claim 5 or 6, characterized in that: The inclined wind shielding portion is arranged to fit the inner wall surface of the air inlet.

8. The low noise turbo blower according to claim 1, characterized in that: The diameter of the body is 1.2 to 1.5 times the diameter of the impeller.

9. The low noise turbo blower according to claim 1, characterized in that: The axial clearance between the main body and the lower cover plate of the impeller is 0.5 mm to 2 mm.

10. A ventilator, characterized in that: It comprises the low-noise turbine fan as described in any one of claims 1 to 9.

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