Combined impeller and turbine

Abstract

The present disclosure relates to the technical field of turbines. Disclosed are a combined impeller and a turbine. The combined impeller comprises: a rotating portion; and a plurality of layers of blades mounted on the rotating portion, wherein blades of some layers are composite blades, and blades of other layers are axial-flow blades; the layers of blades having the axial-flow blades are adjacent to each other; and the length of a projection of a root chord D of each axial-flow blade on the axis of the impeller is a projection length H, and the spacing between adjacent layers having the axial-flow blades is 1 / 5H - 1 / 3H. The present disclosure solves the problem of an existing turbine being unable to provide both a large air volume and a high air pressure within a small space size while simultaneously generating turbulence and excessive noise when a fluid passes through.

Description

Combined impeller and turbine Related applications

[0001] The present disclosure claims priority to Chinese Patent Application No. 2024218149344, filed on July 30, 2024, entitled "A Combined Impeller and Turbine", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the field of turbine technology, and in particular, to a combined impeller and turbine. BACKGROUND

[0003] Axial turbines are widely favored for their high flow rate and low pressure characteristics in industrial applications, particularly in wind power generation and ventilation systems, while centrifugal turbines are specialized in providing high pressure and low flow rate, playing a key role in specific applications such as compressors to lift fluid pressure and to lift fluid from low to high. With the increasing demand for fluid mechanical performance in industry, single-function turbines have been insufficient to meet the diverse application requirements, prompting the industry to begin researching a new turbine design aimed at achieving both high flow rate and high pressure.

[0004] Combined turbine technology is an innovative fluid mechanical design that combines the advantages of axial and centrifugal turbines to provide both high flow rate and high pressure, meeting the needs of fluid power systems diversification and complexity in industrial applications. This technology is widely used in wind power generation, gas compression, fluid transportation, ventilation systems and other fields, not only improving energy conversion efficiency and reducing energy consumption, but also enhancing system reliability and stability, and is one of the key technologies for modern industry to pursue high efficiency, environmental protection and sustainability.

[0005] Although combined turbine technology performs well in fluid power conversion, there are still some problems to be solved, especially in terms of turbulence and noise control. Turbulence can reduce turbine efficiency and increase maintenance costs, and high noise during turbine operation can not only cause discomfort to operators, but also interfere with the surrounding environment.

[0006] Therefore, there is a need to improve existing turbines. SUMMARY

[0007] To address the deficiencies of the related art, the present disclosure provides a combined impeller and turbine that provides both large air volume and high air pressure in a small space, and solves the problem of excessive turbulence and noise when fluid passes through the existing turbine. The technical scheme is as follows:

[0008] The present disclosure relates to a combined impeller, comprising: a rotating part; a plurality of layers of blades mounted on the rotating part, part of the blades being composite blades, part of the blades being axial flow blades, the layers of blades with axial flow blades being arranged adjacently; the length of the chord D of the blade root of the axial flow blade projected on the impeller axis is the projected length H, and the spacing between the adjacent layers with the axial flow blades is 1 / 5H-1 / 3H.

[0009] Preferably, the combined impeller is provided with three layers of blades, the first layer comprising a plurality of first blades, the second layer comprising a plurality of second blades, and the third layer comprising a plurality of third blades, the first blades and the second blades being axial flow blades, and the spacing between the layers of the first blades and the second blades being 1 / 5H-1 / 3H.

[0010] Preferably, the spacing between the layers of the second blades and the third blades is 1 / 3H-1 / 2H.

[0011] Preferably, the third blades are composite blades.

[0012] Preferably, the blades of each layer of the impeller are provided with 3-23 blades, and the blades of each layer are arranged equidistantly and uniformly along the circumferential path around the axis of the impeller.

[0013] Preferably, a shaft hole is provided on the rotating part, and the shaft hole penetrates the rotating part along the axial direction of the rotating part.

[0014] The present disclosure also relates to a turbine comprising the combined impeller, further comprising: a volute; a front cone mounted in the volute; a rotating member mounted on the front cone; the combined impeller mounted on the rotating member; a tail cone mounted in the volute, the tail cone corresponding to the impeller.

[0015] Preferably, a plurality of front guide vanes are provided in the volute.

[0016] Preferably, a plurality of rear guide vanes are provided in the volute.

[0017] The present disclosure has the following beneficial effects:

[0018] Fluids will enter the turbine from the first channel in the input section, and the front guide vanes will form a rotating state around the axis center from the axial flow form, so as to ensure that the fluids enter the impeller in the correct direction and angle.

[0019] (2) When entering the acceleration section, the first blades and the second blades can increase the speed of the fluids to produce greater flow, and the appropriate spacing between the layers can make the fluids flow more smoothly in the combined impeller, reduce the generation of turbulence, improve the delivery efficiency of the fluids, and thus reduce noise.

[0020] (3) When entering the pressurizing section, the fluid is pressurized and pushed out by the third blade, so that the fluid has a high pressure and a high flow rate, and the fluid can be smoothly pushed out of the diffuser section. When passing through the diffuser section, the cross-sectional area is increased, which helps the fluid to diffuse smoothly and reduces the pressure fluctuation caused by too high flow rate, thereby reducing noise. Finally, the fluid flows out of the output section.

[0021] In summary, the present disclosure solves the problem of excessive turbulence and noise generated by the existing turbine when the fluid passes through. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are intended to provide a further understanding of the present disclosure, form a part of the disclosure, and the illustrative embodiments of the present disclosure and their descriptions serve to explain the present disclosure, and do not constitute improper limitations on the present disclosure. In the drawings:

[0023] FIG. 1 is an exploded view of the present disclosure;

[0024] FIG. 2 is a sectional view of the combined impeller of the present disclosure;

[0025] FIG. 3 is a structural schematic diagram of the combined impeller of the present disclosure;

[0026] FIG. 4 is a schematic diagram of the overall structure of the volute of the present disclosure;

[0027] FIG. 5 is a sectional view of the overall structure of the present disclosure.

[0028] Reference signs: 1, combined impeller; 11, first blade; 12, second blade; 13, third blade; 14, rotating part; 141, shaft hole; 142, acceleration part; 143, pressurizing part; 2, volute; 21, first channel; 22, front guide vane; 23, rear guide vane; 24, input section; 25, acceleration section; 26, pressurizing section; 27, diffuser section; 28, output section; 29, second channel; 3, front cone; 4, rotating member; 5, tail cone. DETAILED DESCRIPTION

[0029] In the following, several embodiments of the present disclosure will be disclosed with reference to the drawings. For the purpose of clear description, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present disclosure. That is, in some embodiments of the present disclosure, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in a simple schematic manner in the drawings.

[0030] It should be noted that all direction indications in the embodiments of the present disclosure, such as up, down, left, right, front, back, and the like, are only used to explain the relative positional relationship and movement between components in a certain posture, as shown in the drawings, and if the certain posture changes, the direction indications will also change accordingly.

[0031] In addition, the descriptions such as "first", "second" and the like in the present disclosure are only for the purpose of description, and are not intended to particularly indicate the order or sequence, nor to limit the present disclosure. They are merely used to distinguish the items or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present disclosure.

[0032] In order to further understand the content, characteristics and effects of the present disclosure, the following embodiments are exemplified and described in detail as follows with reference to the accompanying drawings:

[0033] Referring to FIGS. 2 and 3, a combined impeller 1 according to the present disclosure includes a rotating part 14, a plurality of layers of blades mounted on the rotating part 14, and some of the layers of blades are composite blades and some of the layers of blades are axial flow blades. In the present embodiment, the combined impeller 1 is a rotating body, and the combined impeller 1 is sequentially and spacedly provided with three layers of blades along the axial direction. The first layer includes a plurality of first blades 11, the second layer includes a plurality of second blades 12, and the third layer includes a plurality of third blades 13.

[0034] Specifically, the rotating part 14 is provided with a shaft hole 141 for connecting a rotating shaft, the shaft hole 141 penetrates the rotating part 14 along the axial direction of the rotating part 14, and the rotating part 14 includes an acceleration part 142 and a pressurizing part 143 connected integrally. The acceleration part 142 is a rod-shaped structure, the first blades 11 and the second blades 12 are fixedly connected to the side wall of the acceleration part 142, the pressurizing part 143 has a diameter larger than that of the other end away from the acceleration part 142, the pressurizing part 143 is connected to one end of the acceleration part 142 and has a diameter equal to that of the acceleration part 142, the side wall of the pressurizing part 143 is an arc-shaped structure, and the third blades 13 are fixedly connected to the side wall of the pressurizing part 143. The radial length of the third blades 13 is greater than the radial length of the first blades 11 or the second blades 12.

[0035] Referring to Figs. 2 and 3, the first and second blades 11 and 12 are axial flow blades, which make the fluid direction along the axial direction for improving the flow rate of the fluid, and the third blade 13 is a mixed flow blade, i.e. a composite blade, which specifically includes an axial flow section and a centrifugal section; the third blade 13 is used to improve the flow rate and pressure of the fluid and reduce the fluid disturbance, and the flow direction is expanded to the diffuser section.

[0036] Referring to Figs. 2 and 3, the number of blades in each layer of the combined impeller 1 is 3-23, preferably 7, and the blades are uniformly arranged at equal intervals along the circumferential direction of the outer wall of the rotating part 14; the length of the blade root chord D of the axial flow blade projected on the impeller axis is the projected length H, the interval between the first and second blades 11 and 12 is set to 1 / 5H-1 / 3H, and the interval between the second and third blades 12 and 13 is set to 1 / 3H-1 / 2H; it is found through tests that this can reduce turbulent flow and in turn reduce energy consumption.

[0037] Another embodiment of the present disclosure also provides a turbine including the combined impeller 1 in the above embodiments;

[0038] Referring to Figs. 1 and 5, the turbine further includes a volute 2, a front cone 3, a rotating part 4, and a tail cone 5, wherein the front cone 3 is installed in the volute 2, the rotating part 4 is installed on the front cone 3, the combined impeller 1 is installed on the rotating part 4, the tail cone 5 is installed in the volute 2, and the tail cone 5 is connected to the combined impeller 1; the front cone 3, the rotating part 4, the combined impeller 1, and the tail cone 5 are coaxially arranged inside the volute 2. When the turbine works, the rotating part 4 rotates through the bearing to drive the combined impeller 1 to work, the fluid enters the volute 2 from the front cone 3, and the fluid is guided, accelerated, pressurized, and expanded by the front cone 3, the combined impeller 1, and the tail cone 5, and finally flows out.

[0039] Referring to FIG. 4, the scroll casing 2 comprises a first channel 21, a front guide vane 22, a rear guide vane 23, an input section 24, an acceleration section 25, a pressurization section 26, a diffuser section 27, a second channel 29 and an output section 28; the input section 24 is a flared bowl structure, the side wall of which is an outwardly convex arc structure, both ends of the input section 24 are provided with circular openings, the diameters of the openings at both ends of the input section 24 are different, the end with the smaller diameter is the small end, the small end of the input section 24 is integrally connected with one end of the acceleration section 25, the acceleration section 25 is a cylindrical structure, both ends of the acceleration section 25 are also provided with openings, the acceleration part 142 is arranged in the acceleration section 25, the pressurization section 26 is a flared bowl structure, the side wall of which is an outwardly convex arc structure, both ends of the pressurization section 26 are provided with circular openings, the diameters of the openings at both ends of the pressurization section 26 are different, the end with the smaller diameter is the small end, the small end of the pressurization section 26 is integrally connected with the other end of the acceleration section 25, the pressurization part 143 is arranged in the pressurization section 26, the diffuser section 27 is a horn-shaped structure, both ends of the diffuser section 27 are provided with openings, the diameters of the openings at both ends of the diffuser section 27 are different, the end with the larger diameter is the large end, the large end of the diffuser section 27 is integrally connected with the large end of the pressurization section 26, the output section 28 is a cylindrical structure, both ends are provided with openings, the small end of the diffuser section 27 is integrally connected with one end of the output section 28.

[0040] Specifically, the front guide vanes 22 of the scroll casing 2 are provided in plurality, the front guide vanes 22 are arc-shaped blades, the front guide vanes 22 are arranged inside the input section 24 of the scroll casing 2, and the front guide vanes 22 are fixedly connected with the input section 24, the plurality of front guide vanes 22 are uniformly arranged at equal intervals around the axis direction of the input section 24.

[0041] Specifically, the front cone 3 is arranged inside the input section 24, the front cone 3 is a rotating body, the outer wall of the front cone 3 is arc-shaped and corresponds to the shape of the outer shell of the input section 24, in the installed state, a channel is formed between adjacent two front guide vanes 22 and the front cone 3, which is the first channel 21, the first channel 21 is used for flow guiding, so that the fluid can enter the acceleration section 25 from the first channel 21.

[0042] Referring to FIG. 1, the rear guide vanes 23 of the scroll casing 2 are provided in plurality, the rear guide vanes 23 are arc-shaped blades, the rear guide vanes 23 are arranged inside the diffuser section 27, and the rear guide vanes 23 are fixedly connected with the diffuser section 27, the plurality of rear guide vanes 23 are uniformly arranged at equal intervals around the axis direction of the diffuser section 27.

[0043] Specifically, the tail cone 5 is arranged inside the diffuser section 27, the tail cone 5 is a conical structure, the side wall of the tail cone 5 is fixedly connected with the rear guide vanes 23, the large end of the tail cone 5 is connected with the large end of the pressurization part 143, in the installed state, a channel is formed between adjacent two rear guide vanes 23 and the tail cone 5, which is the second channel 29, the fluid enters the output section 28 from the second channel 29, and the cross-sectional area of the second channel 29 gradually increases, thereby realizing the diffuser function of the fluid.

[0044] The size or parameter limit of each part in the impeller structure and the technical effects that can be achieved are further described below through Experiment 1.

[0045] Experiment 1:

[0046] For the above turbine of the present disclosure, numerical simulation is performed using the Reynolds time-averaged N-S equation and the turbulence model. In the research, the method of mass-weighted average turbulent kinetic energy and turbulent dissipation rate is adopted to analyze the distribution law of the turbulent kinetic energy and the turbulent dissipation rate along the radius. The turbine of the present disclosure is taken as Experiment Example 1, and Experiment Examples 2-5 are taken for turbulent testing according to the above standard, wherein the only difference between each experiment example is the spacing between each layer.

[0047] The test results are shown in Tables 1 and 2.

[0048] Table 1 Turbulent test results 1 of the impeller

[0049] Parameter type Experiment Example 1 Experiment Example 2 Experiment Example 3 Spacing between the first blade and the second blade 1 / 5H~1 / 3H 1 / 7H~1 / 5H 1 / 3H~1 / 2H Spacing between the second blade and the third blade 1 / 3H~1 / 2H 1 / 3H~1 / 2H 1 / 3H~1 / 2H Reynolds number (Re) 2235~2302 4034~4147 3857~3987

[0050] Note: When the Reynolds number is greater than 4000, it is in a turbulent state.

[0051] Table 2 Turbulent test results 2 of the impeller

[0052] Parameter type Experiment Example 1 Experiment Example 4 Experiment Example 5 Spacing between the first blade and the second blade 1 / 5H~1 / 3H 1 / 5H~1 / 3H 1 / 5H~1 / 3H Spacing between the second blade and the third blade 1 / 3H~1 / 2H 1 / 5H~1 / 3H 1 / 2H~1H Reynolds number (Re) 2235~2302 3987~4099 4143~4264

[0053] Note: When the Reynolds number is greater than 4000, it is in a turbulent state.

[0054] As can be seen from Table 1, in Example 1, the spacing between the first blade and the second blade is 1 / 5H~1 / 3H, the spacing between the second blade and the third blade is 1 / 3H~1 / 2H, and the Reynolds number is 2235~2302; in Example 2, the spacing between the first blade and the second blade is 1 / 7H~1 / 5H, the spacing between the second blade and the third blade is 1 / 3H~1 / 2H, and the Reynolds number is 4034~4147; in Example 3, the spacing between the first blade and the second blade is 1 / 3H~1 / 2H, the spacing between the second blade and the third blade is 1 / 3H~1 / 2H, and the Reynolds number is 3857~3987.

[0055] As can be seen from Table 2, in Example 1, the distance between the first blade and the second blade is 1 / 5H~1 / 3H, the distance between the second blade and the third blade is 1 / 3H~1 / 2H, and the Reynolds number is 2235~2302; in Example 4, the distance between the first blade and the second blade is 1 / 5H~1 / 3H, the distance between the second blade and the third blade is 1 / 5H~1 / 3H, and the Reynolds number is 3987~4099; in Example 5, the distance between the first blade and the second blade is 1 / 5H~1 / 3H, the distance between the second blade and the third blade is 1 / 2H~1H, and the Reynolds number is 4143~4264. This shows that the distance between the first blade and the second blade is 1 / 5H~1 / 3H, and the distance between the second blade and the third blade is 1 / 3H~1 / 2H, which can reduce the generation of turbulent flow, and in turn reduce energy consumption.

[0056] The beneficial effects of the present disclosure are: in use, the fluid will enter the turbine from the first channel 21 in the input section 24, and the fluid will form a rotating state around the axis by the front guide vane 22, to ensure that the fluid enters the combined impeller 1 in the correct direction and angle; when entering the acceleration section 25, the fluid can increase the speed through the first blade 11 and the second blade 12 to produce greater flow, and at the same time, appropriate distances are provided between the layers, so that the fluid flowing in the combined impeller 1 becomes more smooth, reduces the generation of turbulent flow, improves the delivery efficiency of the fluid, and thus reduces noise; when entering the pressurizing section 26, the fluid has a high pressure and high flow rate state by the pressurizing and pushing out of the third blade 13, so that the fluid can be smoothly pushed out of the diffuser section 27, and when passing through the diffuser section 27, the cross-sectional area is increased, which helps the fluid to diffuse smoothly and reduces the pressure fluctuation caused by too fast flow rate, thereby reducing noise, and finally flowing out of the output section 28; the present disclosure solves the problems of existing turbines, such as turbulent flow, reduced efficiency and noise caused by the complexity of fluid flow.

[0057] The combined impeller and turbine technology of the present disclosure can be used in the field of dust collection, which can produce high-flow high-pressure suction by combining the characteristics of axial flow and centrifugal flow, so as to quickly collect dust and improve work efficiency. The above application scenarios include but are not limited to this field.

[0058] In order to verify the effect of the turbine protected by the present disclosure, the turbine of the present disclosure is combined with a driving motor, a dust suction cover and other mechanisms into a dust suction device, and the dust suction device is tested in terms of flow and pressure, wherein the driving motor has a power of 3Kw, the impeller diameter is 0.125m, the volute diameter is 0.13m, and the total length is 0.45m; when the driving motor rotates at a speed of 24000rpm, the static pressure at the air inlet end is-6300Pa, and the air outlet flow at the output end is 1700m3 / h, which is equivalent to the performance effect of a 9-19A type centrifugal fan with a power of 5.5Kw, a volute diameter of 0.8m, a total length of 0.6m, and a rotating speed of 2900rpm.

[0059] The above is only an embodiment of the present disclosure and is not intended to limit the present disclosure. The present disclosure can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present disclosure shall be included in the scope of claims of the present disclosure.

Claims

1. A modular impeller, characterized in that, The application relates to a combined impeller (1) comprising: a rotating part (14); a plurality of layers of blades are arranged on the rotating part (14), part of the blades are composite blades, part of the blades are axial-flow blades, the blade layers with the axial-flow blades are arranged adjacently; the length of the chord D of the blade root of the axial-flow blades is projected on the impeller axis as a projection length H, and the interval between the adjacent layers with the axial-flow blades is 1 / 5H-1 / 3H.

2. The modular impeller of claim 1, wherein, The combined impeller (1) is provided with three layers of blades, a first layer comprises a plurality of first blades (11), a second layer comprises a plurality of second blades (12), and a third layer comprises a plurality of third blades (13); the first blades (11) and the second blades (12) are axial-flow blades, and the interval between the layers of the first blades (11) and the second blades (12) is 1 / 5H-1 / 3H.

3. The combination impeller of claim 2, wherein, The interval between the layers of the second blades (12) and the third blades (13) is 1 / 3H-1 / 2H.

4. The combined impeller (1) according to claim 2, characterized in that The third blades (13) are composite blades.

5. The combination impeller of claim 2 wherein, The number of blades in each layer of the impeller is 3-23, and the blades in each layer are arranged equidistantly and uniformly along a circumferential path around the axis direction of the impeller.

6. The combination impeller of claim 1, wherein An axle hole (141) is arranged on the rotating part (14), and the axle hole (141) penetrates the rotating part (14) along the axial direction of the rotating part (14).

7. A turbine characterized by, The application further relates to a combined impeller (1) as claimed in any one of claims 1-6, further comprising: a front cone (3) arranged in the volute (2); a rotating part (4) arranged on the front cone (3); and a tail cone (5) arranged in the volute (2) and corresponding to the combined impeller (1).

8. The turbine of claim 7, wherein, A plurality of front guide vanes (22) are arranged in the volute (2).

9. The turbine of claim 7, wherein, A plurality of rear guide vanes (23) are arranged in the volute (2).

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