Centrifugal fan impeller, centrifugal fan and ventilation treatment equipment

Abstract

The utility model relates to the technical field of centrifugal fans, and discloses a centrifugal fan impeller, a centrifugal fan and ventilation treatment equipment. The centrifugal fan impeller comprises a wheel disc and a plurality of main blades, the multiple main blades are arranged on the surface of one side of the wheel disc and distributed in the circumferential direction of the wheel disc at intervals, the multiple main blades comprise at least two reference blades, and the at least two reference blades are arranged in the circumferential direction of the wheel disc at equal intervals; the main blades located between every two adjacent reference blades are arranged at the interval which is gradually increased and then gradually reduced. According to the centrifugal fan impeller, by means of the scheme, at least two reference blades are determined in the multiple main blades, the main blades located between every two adjacent reference blades are arranged at the intervals which are gradually increased and then gradually reduced, on one hand, noise reduction can be achieved through non-uniform arrangement of the main blades, and on the other hand, noise reduction can be achieved through non-uniform arrangement of the main blades; and on the other hand, self-balance of the impeller can be achieved through arrangement of the main blades, and it is not needed to additionally increase or reduce mass at the position of the impeller to conduct dynamic balance correction.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan impeller, a centrifugal fan comprising the centrifugal fan impeller, and ventilation treatment equipment comprising the centrifugal fan. Background Art

[0002] In modern clinical medicine, a ventilator is an auxiliary respiratory therapy device with artificial ventilation function. The breathing gas is supplied to the patient through the breathing tube through the patient interface. By increasing the patient's lung ventilation, it effectively improves the patient's respiratory function. It is now widely used to treat respiratory failure, respiratory insufficiency, sleep apnea syndrome, chronic obstructive pulmonary disease and other respiratory diseases. It can play an important role in assisting patients' breathing, saving and prolonging their lives.

[0003] As the primary power component within a ventilator, the centrifugal fan often determines its overall performance. With increasing awareness of noise in recent years, low noise levels and quietness have become crucial indicators of product quality. As the primary noise source in ventilators, reducing the noise caused by the high-speed rotation of the centrifugal impeller has become a key research hotspot and challenge.

[0004] Long-term research on centrifugal impellers has revealed a strong correlation between impeller noise and the impeller's periodicity. This has made the study of non-uniform blades a hot topic and a challenge in recent years in the field of centrifugal impeller noise reduction. Non-uniform blades have become one of the current mainstream research directions in centrifugal impeller noise reduction.

[0005] Existing centrifugal non-uniform impellers are commonly found in forward multi-blade fans. Forward multi-blade fans are characterized by short and vertical blades, including an area with densely arranged blades. Due to the concentration of mass in the direction of dense blades, the overall impeller operation is dynamically unbalanced, requiring additional mass to be added or reduced at the impeller for dynamic balance correction. Utility Model Content

[0006] The purpose of the utility model is to provide a centrifugal fan impeller, a centrifugal fan including the centrifugal fan impeller, and a ventilation treatment device including the centrifugal fan to address the problem that the existing centrifugal non-uniform impeller is dynamically unbalanced and needs to add or reduce additional mass at the impeller to perform dynamic balance correction.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a centrifugal fan impeller, including a wheel disc and a plurality of main blades, wherein the plurality of main blades are arranged on one side surface of the wheel disc and are arranged at intervals along the circumference of the wheel disc, the plurality of main blades include at least two reference blades, and the at least two reference blades are arranged at equal intervals along the circumference of the wheel disc, and the main blades located between two adjacent reference blades are arranged at a spacing that first gradually increases and then gradually decreases.

[0008] In some embodiments, a splitter blade is provided in the interval between adjacent main blades, and the splitter blade is arranged on the center line of the interval.

[0009] In some embodiments, a reinforcement structure is provided on the other side surface of the wheel disc.

[0010] In some embodiments, the trailing edge of the splitter blade is flush with the trailing edge of the main blade, and the length of the splitter blade is shorter than the length of the main blade.

[0011] In some embodiments, the twisting trend of the splitter blade is consistent with that of the main blade.

[0012] In some embodiments, a guide portion protruding toward the side where the main blade is located is provided at the center of the wheel disc, and the leading edge of the main blade extends obliquely away from the wheel disc in a direction from the guide portion toward the outer periphery of the wheel disc.

[0013] In some embodiments, an upper edge of the main blade facing away from the wheel disk is formed in a curve that bends and extends toward the wheel disk in a direction from the leading edge to the outer peripheral edge of the wheel disk.

[0014] In some embodiments, the wheel disc has a central opening, the guide portion is a conical structure protruding from the periphery of the central opening, and the centrifugal fan impeller further includes a guide cone, which is coaxially mounted on the guide portion.

[0015] In some embodiments, a position where the leading edge meets the upper edge forms a turning point, and a height of the turning point is greater than or equal to a height of a top end of the guide portion.

[0016] In some embodiments, the trailing edge of the main blade extends obliquely toward the wheel disc in a radially outward direction of the wheel disc.

[0017] In some embodiments, the main blades are twisted clockwise or counterclockwise outward in the radial direction of the wheel disc.

[0018] A second aspect of the present invention provides a centrifugal fan, comprising a volute and the centrifugal fan impeller. The volute defines an installation cavity inside, and the centrifugal fan impeller is coaxially installed in the installation cavity.

[0019] In some embodiments, a centrifugal fan inlet connected to the mounting cavity is provided at the top of the volute, and a centrifugal fan outlet connected to the mounting cavity is provided on the circumferential side of the volute, and the centrifugal fan outlet is located below the wheel in the axial direction of the volute.

[0020] In some embodiments, the centrifugal fan includes a motor, and a mounting opening for partially mounting the motor in the mounting cavity is provided at the bottom of the volute, and a motor shaft of the motor is connected to the wheel disc.

[0021] A third aspect of the present invention provides a ventilation treatment device, comprising the above-mentioned centrifugal fan.

[0022] The centrifugal fan impeller of the present invention adopts the above-mentioned scheme to determine at least two reference blades among multiple main blades, and arranges the main blades located between the two adjacent reference blades at a spacing that first gradually increases and then gradually decreases. On the one hand, noise reduction can be achieved through the uneven arrangement of the main blades. On the other hand, the arrangement of the main blades can also enable the impeller to achieve self-balancing, without the need to increase or reduce the mass of the impeller for dynamic balance correction.

[0023] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 This is a front view of an embodiment of the centrifugal fan impeller in the utility model;

[0026] Figure 2 yes Figure 1 Side view of the centrifugal fan impeller;

[0027] Figure 3 It is a side view of another embodiment of the centrifugal fan impeller in the utility model;

[0028] Figure 4 yes Figure 3 Exploded view of the centrifugal fan impeller;

[0029] Figure 5 yes Figure 4 AA cross-sectional view of the centrifugal fan impeller;

[0030] Figure 6 yes Figure 3Bottom view of the centrifugal fan impeller;

[0031] Figure 7 yes Figure 6 A three-dimensional diagram of the centrifugal fan impeller;

[0032] Figure 8 This is a front view of an embodiment of the centrifugal fan in the utility model;

[0033] Figure 9 yes Figure 8 BB cross-sectional view of the centrifugal fan;

[0034] Figure 10 yes Figure 8 Exploded view of a centrifugal fan.

[0035] Description of Reference Numerals

[0036] 1-wheel disc, 11-guide part, 12-boss, 13-reinforcement rib, 2-main blade, 2A-reference blade, 21-leading edge, 22-trailing edge, 23-upper edge, 24-turning point, 3-divergent blade, 4-guide cone, 5-volute, 51-installation cavity, 52-centrifugal fan inlet, 53-centrifugal fan outlet, 54-installation port, 55-upper volute, 56-lower volute, 6-motor, 61-motor shaft. DETAILED DESCRIPTION

[0037] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings. The following detailed description of the embodiments and the accompanying drawings are intended to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but rather includes all technical solutions within the scope of the claims.

[0038] The present invention provides these embodiments to make the present invention thorough and complete, and to fully convey the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, material compositions, numerical expressions, and numerical values ​​described in these embodiments should be interpreted as merely exemplary and not as limiting.

[0039] It should be noted that, in the description of this utility model, unless otherwise specified, "plurality" means greater than or equal to two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on this utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] In addition, the terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are simply used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means that the positions are within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means that the positions are within the tolerance range. "Include" or "comprising" and similar terms mean that the elements listed before the word include the elements listed after the word, and do not exclude the possibility that other elements may also be included.

[0041] All terms used in this utility model have the same meaning as those understood by ordinary technicians in the field to which this utility model belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0042] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0043] A first aspect of the present invention provides a centrifugal fan impeller, comprising a disc 1 and a plurality of main blades 2, wherein the plurality of main blades 2 are arranged on a side surface of the disc 1 and are spaced apart along the circumference of the disc 1, wherein the plurality of main blades 2 include at least two reference blades 2A, and the at least two reference blades 2A are arranged at equal intervals along the circumference of the disc 1, and the main blades 2 located between two adjacent reference blades 2A are arranged at a spacing that first gradually increases and then gradually decreases.

[0044] In the above description, it can be understood that the reference blades 2A are selected from the main blades 2, that is, at least two main blades 2 among the plurality of main blades 2 are used as the reference blades 2A, and the main blades 2 between two adjacent reference blades 2A are arranged such that the spacing gradually increases and then gradually decreases from one reference blade 2A toward the other reference blade 2A. The increasing and decreasing spacings are equal, and the spacing is actually an interval angle, which can be determined according to the following formula:

[0045]

[0046] in, is the spacing angle of non-uniform pitch blades, is the uniform blade spacing angle, A is the modulation amplitude, and N is the number of cycles of the modulation amount.

[0047] For example Figure 1In the embodiment shown, when the plurality of main blades 2 include two reference blades 2A, the two reference blades 2A are located in the same diameter direction of the wheel disc 1, that is, the interval angle between the two reference blades 2A in the circumferential direction is 180 degrees, and the main blades 2 located in the left and right areas of the two reference blades 2A are arranged at intervals that first gradually increase and then gradually decrease, thereby dividing the plurality of main blades 2 into two densely arranged areas (see Figure 1 The upper and lower areas shown have relatively small spacing between the main blades 2) and two non-densely arranged areas (see Figure 1 In the left and right areas shown, the spacing between the main blades 2 is relatively large), and the two densely arranged areas and the two non-densely arranged areas are staggered with each other, so that the impeller as a whole forms a self-balancing non-uniform distribution.

[0048] Preferably, A is 0.04 to 0.16, and N is 1 to 4. Figure 1 In the equation, A is 0.04 and N is 2.

[0049] The centrifugal fan impeller of the present invention adopts the above-mentioned scheme to determine at least two reference blades 2A among multiple main blades 2, and arranges the main blades located between two adjacent reference blades at a spacing that first gradually increases and then gradually decreases. On the one hand, noise reduction can be achieved through the uneven arrangement of the main blades (uneven blades generate noises of different frequencies, and noises of different frequencies will not be superimposed on each other, thereby achieving noise reduction). On the other hand, the arrangement of the main blades can also enable the impeller to achieve self-balancing (the self-balancing structure will not have the problem of mass concentration between specific angles of the impeller due to the uneven arrangement of the blades, thereby affecting the balance of the overall shaft system), and there is no need to add or reduce additional mass at the impeller for dynamic balancing correction.

[0050] In the present invention, the interval between two adjacent main blades 2 forms a main channel for the medium to flow. The main blades 2 can be arranged perpendicular to the wheel disc 1 as a whole, or can be arranged slightly inclined relative to the wheel disc 1.

[0051] In some embodiments, see Figure 1 and Figure 2 , splitter blades 3 are further provided between adjacent main blades 2. That is, each main channel is provided with a splitter blade 3 extending in the same direction as the corresponding main blade 2 (i.e., the main blade 2 used to define the corresponding main channel 3). The length of the splitter blade 3 is shorter than that of the main blade 2, and the trailing edge of the splitter blade 3 is flush with the trailing edge 22 of the main blade 2.

[0052] The splitter blade 3 can separate the outlet of the main channel (i.e., the end of the main channel close to the outer periphery of the wheel disc 1) into two split channels, thereby suppressing the "axial vortex" in the main channel and reducing the noise (i.e., vortex noise) generated by the "axial vortex" at the outlet of the main channel.

[0053] In order to balance the airflow in the two diversion channels, reduce the aerodynamic impact on the blades, and prevent the impeller from becoming unstable, it is best to locate the diversion blade 3 on the center line of the main channel, that is, the diversion blade 3 divides the corresponding part of the main channel into two diversion channels.

[0054] See also Figure 1 and Figure 2 The main blades 2 may be twisted clockwise or counterclockwise outward along the radial direction of the wheel disc 1. The twisting trend of the splitter blades 3 may be consistent with that of the main blades 2.

[0055] In the present invention, there is no limitation on the specific structure of the wheel disc 1, the main blade 2, and the splitter blade 3. For example, in some embodiments, see Figure 1 and Figure 2 The center of the wheel disc 1 may be provided with a guide portion 11 protruding toward the side where the main blade 2 is located, and the leading edge 21 of the main blade 2 extends obliquely away from the wheel disc 1 in the direction from the guide portion 11 toward the outer periphery of the wheel disc 1, that is, the leading edge is swept back.

[0056] The wheel disc 1 has a central opening, and the guide portion 11 is a conical structure protruding upward through the periphery of the central opening. In other words, the wheel disc as a whole has a structure similar to a truncated cone.

[0057] See also Figure 6-Figure 7 The bottom surface of the wheel disc 1 is a concave surface, that is, the bottom surface of the wheel disc 1 is concave to form a cavity. A reinforcement structure can be provided on the bottom surface of the wheel disc 1 to ensure the strength of the wheel disc when the impeller rotates and prevent it from deformation.

[0058] Specifically, if Figure 6-Figure 7 In the illustrated embodiment, the reinforcement structure may include a cylindrical boss 12 extending axially downward from the inner circumference of the impeller 1, and a plurality of reinforcing ribs 13 extending radially outward from the outer circumference of the boss 12. The plurality of reinforcing ribs 13 are evenly spaced around the circumference of the boss 12. Preferably, the top surface of the reinforcing rib 13 is connected to the bottom surface of the impeller 1, and the bottom surface of the reinforcing rib 13 and the bottom end surface of the cylindrical boss 12 are flush with the bottom end surface of the impeller 1. The reinforcing rib 13 is generally triangular in shape, and the top surface of the reinforcing rib 13 is consistent with the surface profile of the bottom surface of the impeller 1. This allows the reinforcing rib 13 to conform to the bottom surface of the impeller 1, thereby reducing the rotational inertia of the impeller.

[0059] In the present utility model, Figure 3-Figure 5As shown, the centrifugal fan impeller may further include a guide cone 4, which is coaxially mounted on the guide portion 11. The presence of the guide cone 4 can ensure that the airflow enters the impeller flow channel smoothly and smoothly without airflow impact at the inlet. In order to ensure concentricity, the guide cone 4 is preferably made of metal material, so that the material removal required for static and dynamic balancing of the impeller can be placed at the guide cone. The metal material can ensure that more imbalance is subtracted when the material removal volume is the same. Removing material at the guide cone can greatly avoid damage to the impeller during material removal.

[0060] The upper edge 23 of the main blade 2, which faces away from the disk 1, can be formed into a curve that bends and extends toward the disk 1 in the direction from the leading edge 21 toward the outer peripheral edge of the disk 1. The location where the leading edge 21 and the upper edge 23 meet forms a turning point 24, and the height of the turning point 24 is greater than or equal to the height of the top of the guide portion 11. The trailing edge 22 of the main blade 2 can extend obliquely toward the disk 1 in the radially outward direction of the disk 1. This arrangement (i.e., the forward sweep of the trailing edge) can reduce the mass of the impeller, thereby reducing the impeller's rotational inertia, thereby reducing the motor load, suppressing the heat generated by the motor during operation, and effectively increasing the motor's service life.

[0061] A second aspect of the present invention provides a centrifugal fan, comprising a volute 5 and the above-mentioned centrifugal fan impeller.

[0062] like Figures 8-10 As shown, the volute 5 defines an installation cavity 51 inside, and the centrifugal fan impeller is coaxially installed in the installation cavity 51. The top of the volute 5 is provided with a centrifugal fan inlet 52 connected to the installation cavity 51, and the circumferential side of the volute 5 is provided with a centrifugal fan outlet 53 connected to the installation cavity 51. The centrifugal fan outlet 53 is located below the wheel disc 1 in the axial direction of the volute 5 (see Figure 9 As shown, the centrifugal fan outlet 53 is located below the wheel disc 1).

[0063] In order to reduce the volume of the centrifugal fan, the volute 5 of the present invention may not include a bladeless diffuser, but this will result in the volute being unable to effectively convert a portion of the dynamic pressure into static pressure, that is, it will be unable to further improve the static pressure efficiency; and the increase in dynamic pressure will inevitably lead to increased pressure fluctuations, which will further induce noise caused by pressure fluctuations. In order to solve this problem, the present invention makes the centrifugal fan outlet 53 located below the impeller 1 in the axial direction of the volute 5, increasing the axial space at the bottom of the impeller, so that the impeller generates dynamic pressure and static pressure on the fluid. The fluid will flow downward along the axial direction of the volute due to the obstruction of the inner wall of the volute. During the flow process, the convection diffusion effect will cause the fluid flow rate to decrease and be recovered as static pressure, thereby improving the static pressure efficiency and reducing noise.

[0064] In the present utility model, Figures 8-10As shown, the centrifugal fan also includes a motor 6. The bottom of the volute 5 is provided with a mounting opening 54 for partially mounting the motor 6 within the mounting cavity 51. The motor shaft 61 of the motor 6 is connected to the impeller 1 to drive the impeller. By partially enclosing the motor 6 within the flow channel of the volute, the present invention allows the motor to dissipate heat in two ways: conduction and convection, thereby achieving better heat dissipation.

[0065] In the present invention, in order to facilitate installation and maintenance, the volute 5 can be formed by connecting an upper volute 55 and a lower volute 56.

[0066] The specific structure and shape of the volute 5 in the utility model can be found in 8- Figure 10 shown.

[0067] The centrifugal fan of the present invention can effectively reduce noise by adopting the self-balancing non-uniform centrifugal impeller, and there is no need to increase or decrease the mass of the impeller for dynamic balance correction.

[0068] A third aspect of the present invention provides a ventilation treatment device, comprising the above-mentioned centrifugal fan.

[0069] The ventilation therapy equipment may be a ventilator, an oxygen therapy device, etc.

[0070] The ventilation therapy device of the present invention can effectively reduce the noise during use by adopting the above-mentioned centrifugal fan, so that the patient can obtain respiratory system assistance while being free from the discomfort caused by high noise.

[0071] Thus far, various embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details well known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0072] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art will understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts.

Claims

1. A centrifugal fan impeller, characterized in that: The invention comprises a wheel disc (1) and a plurality of main blades (2), wherein the plurality of main blades (2) are arranged on a side surface of the wheel disc (1) and are spaced apart along the circumference of the wheel disc (1), wherein the plurality of main blades (2) include at least two reference blades (2A), wherein the at least two reference blades (2A) are arranged at equal intervals along the circumference of the wheel disc (1), and the main blades (2) located between two adjacent reference blades (2A) are arranged at an interval that first gradually increases and then gradually decreases.

2. The centrifugal fan impeller according to claim 1, characterized in that: A splitter blade (3) is provided in the interval between adjacent main blades (2), and the splitter blade (3) is arranged on the center line of the interval; and / or A reinforcement structure is provided on the other side surface of the wheel disc (1).

3. The centrifugal fan impeller according to claim 2, characterized in that: The trailing edge of the splitter blade (3) is flush with the trailing edge (22) of the main blade (2), and the length of the splitter blade (3) is less than the length of the main blade (2); and / or The twisting trend of the splitter blade (3) is consistent with that of the main blade (2).

4. The centrifugal fan impeller according to claim 1, characterized in that: A guide portion (11) is provided at the center of the wheel disc (1) and protrudes toward the side where the main blade (2) is located. The leading edge (21) of the main blade (2) extends obliquely away from the wheel disc (1) in a direction from the guide portion (11) toward the outer periphery of the wheel disc (1).

5. The centrifugal fan impeller according to claim 4, characterized in that: The upper edge (23) of the main blade (2) facing away from the wheel disc (1) is formed as a curve extending from the leading edge (21) toward the outer peripheral edge of the wheel disc (1) toward the wheel disc (1); and / or The wheel disc (1) has a central opening, the guide portion (11) is a conical structure protruding from the periphery of the central opening, and the centrifugal fan impeller further includes a guide cone (4), which is coaxially mounted on the guide portion (11).

6. The centrifugal fan impeller according to claim 5, characterized in that: The position where the front edge (21) and the upper edge (23) meet forms a turning point (24), and the height of the turning point (24) is greater than or equal to the height of the top end of the guide portion (11).

7. The centrifugal fan impeller according to claim 1, characterized in that: The trailing edge (22) of the main blade (2) extends obliquely toward the wheel disc (1) in a radially outward direction of the wheel disc (1).

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

9. A centrifugal fan, characterized in that: The invention comprises a volute (5) and a centrifugal fan impeller according to any one of claims 1 to 8, wherein a mounting cavity (51) is defined inside the volute (5), and the centrifugal fan impeller is coaxially mounted in the mounting cavity (51).

10. The centrifugal fan according to claim 9, characterized in that: A centrifugal fan inlet (52) communicating with the mounting cavity (51) is provided at the top of the volute (5), a centrifugal fan outlet (53) communicating with the mounting cavity (51) is provided on one circumferential side of the volute (5), and the centrifugal fan outlet (53) is located below the wheel (1) in the axial direction of the volute (5); and / or The centrifugal fan comprises a motor (6); a mounting opening (54) for partially mounting the motor (6) in the mounting cavity (51) is provided at the bottom of the volute (5); and a motor shaft (61) of the motor (6) is connected to the wheel (1).

11. A ventilation therapy device, characterized in that: Including the centrifugal fan according to claim 9 or 10.

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