Bidirectional inlet three-dimensional flow fan driven by a coupling

Abstract

The application discloses a kind of coupler transmission's bidirectional intake three-element flow fan, including shell, the impeller is arranged in the inside center of shell, impeller is the three-element flow impeller of bidirectional intake structure, impeller is fixed on the main shaft by wheel hub, main shaft penetrates fan interior, and main shaft one end is connected motor by coupler;The impeller includes two front disc body, a common rear disc body and a plurality of three-element twisted blades installed on the both sides of rear disc body, the three-element twisted blade of any side is installed between front disc body and rear disc body, and a plurality of three-element twisted blades are respectively evenly spaced and set in the circumferential direction of the both sides of rear disc body and mirror image symmetry;The design profile of the three-element twisted blade at front disc body is offset to the direction of impeller rotation than the design profile at rear disc body, so that the design profile at front disc body and the design profile at rear disc body are not crossed.In the application, blade processing technology is simpler, production cycle and cost are reduced, and the design of bidirectional intake effectively increases the air intake of fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan, in particular to a kind of two-way air intake three-dimensional flow fan of coupling transmission. BACKGROUND

[0002] Fan is a kind of fluid machinery widely used in factory, mine, tunnel, cooling tower, boiler and industrial kiln, mainly for ventilation, dust removal and cooling functions etc.Common fan is usually single-sided air intake, impeller adopts two-dimensional design, or in the case of two-sided air intake, increase air intake box to guide air intake, and adopt belt drive.Conventional three-dimensional blade has larger space twist shape, its forming method needs to make special blade pressure surface, suction surface profile mold, through induction heating equipment to heat softening to blade, then hot-press forming, reduce the rebound amount of forming, form space twist three-dimensional blade, the production process is complicated, and the production cycle is long. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a kind of two-way air intake three-dimensional flow fan of coupling transmission, which can effectively increase the air intake of fan, and the processing technology of blade is simpler.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is: a kind of two-way air intake three-dimensional flow fan of coupling transmission, including casing, the center of the inside of the casing is provided with impeller, the impeller is two-way air intake structure's three-dimensional flow impeller, impeller is fixed on the main shaft through the hub, the main shaft penetrates the inside of fan, and one end of the main shaft is connected with motor through coupling;The impeller includes two front disc bodies, a common rear disc body and a plurality of three-dimensional twist blades installed on both sides of the rear disc body, the three-dimensional twist blades on any side are installed between the front disc body and the rear disc body, and a plurality of three-dimensional twist blades are respectively and uniformly arranged on both sides of the rear disc body in the circumferential direction and are mirror-symmetric;The design profile of the three-dimensional twist blade at the front disc body is offset to the rotating direction of the impeller than the design profile at the rear disc body, so that the design profile at the front disc body and the design profile at the rear disc body are not crossed.

[0005] Preferably, the design profile at the front disc body and the design profile at the rear disc body are both composed of two same tangent circular arcs, that is, the profile at the front disc body is composed of first upper arc line and second upper arc line, and the profile at the rear disc body is composed of first lower arc line and second lower arc line;The radius of the second upper arc line and the second lower arc line is 1.5-2.5 times the radius of the first upper arc line and the first lower arc line respectively.

[0006] Preferably, the two side plates of the casing are respectively connected with the air inlet end of one air inlet cone pipe, and the convergent ends of the two air inlet cone pipes are respectively inserted into the air inlet ends on both sides of the impeller, and form a sleeve opening assembly relationship with the two front disc bodies respectively.

[0007] Preferably, the single-sided air inlet cone pipe has a radial gap of 2-10 mm with the front disc body, and the single-sided air inlet cone pipe has an axial insertion size of 5-15 mm into the inside of the front disc body.

[0008] Preferably, the single-sided air inlet cone pipe has a radial gap of 2 mm with the front disc body, and the single-sided air inlet cone pipe has an axial insertion size of 10 mm into the inside of the front disc body.

[0009] Preferably, the three-dimensional twisted blade is a single-plate space twisted blade, which is generated by lofting a profile line at the front disc body and a profile line at the rear disc body.

[0010] Preferably, the three-dimensional twisted blade is a single-plate space twisted blade, which is generated by lofting a profile line at the front disc body and a profile line at the rear disc body.

[0011] Preferably, the three-dimensional twisted blade is a single-plate space twisted blade, which is generated by lofting a profile line at the front disc body and a profile line at the rear disc body.

[0012] Preferably, the three-dimensional twisted blade is a single-plate space twisted blade, which is generated by lofting a profile line at the front disc body and a profile line at the rear disc body.

[0013] Preferably, the air inlet cone pipe is provided with an inlet pressure net at the inlet end, which is used for preventing foreign matters from entering the fan and causing damage, and improving the safety during use of the fan.

[0014] According to the above technical solution, the application has the following beneficial effects:

[0015] 1. The blade in the application adopts a single-plate twisted blade to replace a traditional airfoil-shaped blade, which reduces the weight of the whole machine and reduces the blade wall separation loss; and the blade is three-dimensionally formed by adopting a blade tilting and inverting method to replace a traditional processing technology, without the need of using a special mold and heating equipment for hot-press forming, so that the processing technology is simpler, and the production cycle and cost are reduced.

[0016] 2. The application significantly increases the air inlet amount of the fan and improves the efficiency of the fan through the design of the air inlet of the fan being directly connected to the atmosphere.

[0017] 3. The application adopts a coupling transmission form, improves the transmission efficiency, can bear a large torque, realizes the improvement of the performance of the fan, ensures stable operation, and has a simple and compact structure and is easy to maintain.

[0018] 4. The application adopts a bidirectional air inlet three-dimensional flow impeller, the three-dimensional flow impeller is designed based on the three-dimensional flow theory, the three-dimensional space inside the impeller is infinitely divided, and a complete dynamic model is established, so that the air flow process of each section is optimized, the energy consumption loss is reduced, and the performance of the fan is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a total assembly view of the present application;

[0020] Figure 2 is a cross-sectional structural schematic view of the present application;

[0021] Figure 3 is Figure 2 a structural schematic view of a middle impeller;

[0022] Figure 4 is a design profile schematic view of a blade on a rear disc body;

[0023] Figure 5 is a design profile schematic view of a blade on a front disc body.

[0024] Marked in the figure: 1, casing, 2, impeller, 3, air inlet cone pipe, 4, coupling, 5, motor, 6, main shaft, 7, inlet pressure net, 8, front disc body, 9, three-element twisted blade, 10, rear disc body, 11, first upper arc line, 12, second upper arc line, 13, first lower arc line, 14, second lower arc line, 15, reinforcing plate. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] The structure, proportion, size, etc. shown in the drawings of the present specification are merely used to cooperate with the content disclosed in the specification, for understanding and reading by those skilled in the art, and do not have technical substantial significance, and any modification of structure, change of proportion relationship, or adjustment of size, without affecting the effects and purposes that can be produced by the present application, should still fall within the scope covered by the disclosed technical content of the present application.

[0027] Meanwhile, it needs to be noted that, unless otherwise stated, the orientation or position relationship indicated by the terms "upper", "lower", etc. is based on the orientation or position relationship shown in the drawings, and is merely for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Changes or adjustments of relative relationship, without substantial changes in technical content, are also considered as the implementable scope of the present application. In addition, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] As Figures 1 to 3 shown, a coupling-driven bidirectional air inlet three-element flow fan includes a casing 1, an impeller 2, two air inlet cone pipes 3, a coupling 4, a motor 5, a main shaft 6, an inlet pressure net 7, and a reinforcing plate 15.

[0029] The casing 1 is split into upper and lower parts for easy installation, disassembly and maintenance.

[0030] A hub 2 is arranged at the center of the casing 1, and the hub 2 is fixed to a main shaft 6 which penetrates through the whole fan, and the main shaft 6 is connected to a motor 5 through a coupling 4, and the motor 5 drives the main shaft 6 and the hub 2 to rotate through the coupling 4.

[0031] The hub 2 is a three-dimensional flow hub with a bidirectional air inlet structure, and the three-dimensional flow hub 2 is designed based on the three-dimensional flow theory, and the three-dimensional space inside the hub 2 is infinitely divided to establish a complete dynamic model, thereby optimizing the air flow process of each section, reducing energy loss, and improving the efficiency of the fan.

[0032] The hub 2 includes two front disc bodies 8, a shared rear disc body 10, and a plurality of three-dimensional twisted blades 9 arranged on both sides of the rear disc body 10, and the three-dimensional twisted blades 9 on any one side are arranged between the front disc body 8 and the rear disc body 10, and the plurality of three-dimensional twisted blades 9 are arranged in the circumferential direction and are mirror-symmetrically arranged on both sides of the rear disc body 10.

[0033] In this embodiment, the connection mode of the three-dimensional twisted blade 9 and the rear disc body is welding.

[0034] The three-dimensional twisted blade 9 is a single plate structure, that is, the three-dimensional twisted blade 9 is a single plate space twisted blade. The three-dimensional twisted blade 9 is generated by lofting the design profile at the front disc body 8 and the design profile at the rear disc body 10. Further, the number of single-sided three-dimensional twisted blades 9 is n, n is an integer, and 8≤n≤16; in this embodiment, the best embodiment parameter is that the number of single-sided three-dimensional twisted blades is 16.

[0035] The design profile at the front disc body 8 and the design profile at the rear disc body 10 are both composed of two same-direction tangent circular arcs, specifically, the design profile at the front disc body 8 is composed of a first upper arc line and a second upper arc line, and the design profile at the rear disc body 10 is composed of a first lower arc line and a second lower arc line. Further, the radius of the second upper arc line is 1.5-2.5 times the radius of the first upper arc line; the radius of the second lower arc line is 1.5-2.5 times the radius of the first lower arc line. R1 is the radius of the first upper arc line 11, R2 is the radius of the second upper arc line 12, R3 is the radius of the first lower arc line 13, and R4 is the radius of the second lower arc line 14; in this embodiment, the best embodiment parameter is that the ratio of R2 to R1 is 2.19, and the ratio of R4 to R3 is 2. The first upper arc line and the first lower arc line play a role of meeting the air inlet angle of the airflow and driving the airflow to turn, and the second upper arc line and the second lower arc line play a role of improving the pressure and ensuring the stable growth of the static pressure.

[0036] The two side plates of the casing 1 are respectively provided with holes, and the hole positions are respectively connected and assembled with the air inlet ends of the two air inlet cone pipes 3. In the embodiment, the connection and assembly mode of the two side plates of the casing 1 and the air inlet cone pipes 3 is welding or bolt connection.

[0037] The convergent ends of the two air inlet cone pipes 3 are respectively inserted into the air inlet ends of the two sides of the impeller 2, and are respectively assembled in a sleeve opening fitting mode with the two front disc bodies 8. Further, the radial gap between the single-sided air inlet cone pipe 3 and the front disc body 8 is 2-10 mm, and the axial insertion size into the inside of the front disc body 8 is 5-15 mm. In the embodiment, the optimal embodiment parameters are: the radial gap is 2 mm, and the axial insertion size into the inside of the front disc body 8 is 10 mm.

[0038] As shown in Figure 4 and Figure 5 , the design profile of the three-element twisted blade 9 at the front disc body 8 is offset to the rotating direction of the impeller 2 than the design profile at the rear disc body 8, so that the design profile at the front disc body 8 does not cross the design profile at the rear disc body 10.

[0039] In the embodiment, define α1 as the inlet angle of the design profile at the front disc body 8, β1 as the outlet angle of the design profile at the front disc body 8, α2 as the inlet angle of the design profile at the rear disc body 10, and β2 as the outlet angle of the design profile at the rear disc body 10. Specifically, α1 < α2 to reduce the inlet angle of the airflow on the front side; β1 < β2 to improve the efficiency of the impeller 2. It should be noted that the detailed definition of the inlet angle and the outlet angle in the embodiment can refer to the disclosure of Chinese patent CN 110439834A; this definition is not the improvement point of the present application, and will not be described here.

[0040] In the embodiment, the blade three-dimensional forming can use the blade tilting and inverting method instead of the traditional processing technology, without using special molds and heating equipment for hot pressing forming, so that the production is simpler and the production cycle is shorter.

[0041] The middle positions of the three-element twisted blades 9 on the two sides of the rear disc body 10 are respectively welded with reinforcing plates 15, and the inclination angle of the reinforcing plate 15 is 5°-10°.

[0042] The inlet end of the air inlet cone pipe 3 is provided with an inlet pressure net 7 for preventing foreign matters from entering the fan and causing damage, and improving the safety during use of the fan. Preferably, the pressure net material of the inlet pressure net 7 uses a common steel wire woven net, which is convenient for manufacturing.

[0043] It should be noted that the above embodiments are only used to illustrate the present application, but the present application is not limited to the above embodiments, and any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments all fall within the protection scope of the present application.

Claims

1. A bidirectional inlet three-dimensional flow fan driven by a shaft coupling, comprising a casing (1), characterized in that: The impeller (2) is a three-dimensional flow impeller with a bidirectional air inlet structure, and the impeller (2) is fixed to the main shaft (6) through a hub. The impeller (2) comprises two front disc bodies (8), one shared rear disc body (10), and a plurality of three-dimensional twisted blades (9) mounted on both sides of the rear disc body (10), wherein the three-dimensional twisted blades (9) on any one side are mounted between the front disc body (8) and the rear disc body (10), and the plurality of three-dimensional twisted blades (9) are evenly and separately arranged on the circumferential direction of both sides of the rear disc body (8) and are mirror-symmetric. The design profile of the three-dimensional twisted blade (9) at the front disc body (8) is offset to the rotating direction of the impeller (2) compared with the design profile at the rear disc body (8), so that the design profile at the front disc body (8) and the design profile at the rear disc body (10) are not crossed.

2. A dual inlet three-dimensional flow fan of the type described in claim 1, characterized in that: The design profile at the front disc body (8) and the design profile at the rear disc body (10) are both composed of two same tangent circular arcs, that is, the profile at the front disc body (8) is composed of a first upper arc (11) and a second upper arc (12), and the profile at the rear disc body (10) is composed of a first lower arc (13) and a second lower arc (14); the radius of the second upper arc (12) and the second lower arc (14) is 1.5-2.5 times the radius of the first upper arc (11) and the first lower arc (13).

3. A dual inlet three-dimensional flow fan of the type described in claim 1, wherein: The two side plates of the casing (1) are respectively connected to the air inlet ends of one air inlet cone pipe (3), and the convergent ends of the two air inlet cone pipes (3) are respectively inserted into the air inlet ends on both sides of the impeller (2) to form a sleeved and fitted assembly relationship with the two front disc bodies (8).

4. A dual inlet three-dimensional flow fan of the type described in claim 3, wherein: The radial gap between the single-sided air inlet cone pipe (3) and the front disc body (8) is 2-10 mm, and the axial insertion size of the single-sided air inlet cone pipe (3) into the inside of the front disc body (8) is 5-15 mm.

5. A dual inlet three-dimensional flow fan of the type described in claim 4, wherein: The radial gap between the single-sided air inlet cone pipe (3) and the front disc body (8) is 2 mm, and the axial insertion size of the single-sided air inlet cone pipe (3) into the inside of the front disc body (8) is 10 mm.

6. A dual inlet three-dimensional flow fan of the type described in claim 1, wherein: The three-dimensional twisted blade (9) is a single-plate space twisted blade generated by lofting the design profile at the front disc body (8) and the design profile at the rear disc body (10).

7. A dual inlet three-dimensional flow fan of the type described in claim 1, wherein: The number of the single-sided three-dimensional twisted blades (9) is n, n is an integer, and 8≤n≤16.

8. A dual inlet three-dimensional flow fan of the type described in claim 7, wherein: The number of the single-sided three-dimensional twisted blades (9) is 16.

9. A dual inlet three-dimensional flow fan of the type described in claim 7, wherein: The three-dimensional twisted blade (9) is welded with a reinforcing plate (15) at the middle position, and the inclination angle of the reinforcing plate (15) is 5°-10°.

10. A dual inlet three-dimensional flow fan of the type described in claim 3, wherein: The air inlet end of the air inlet cone pipe (3) is provided with an inlet pressure net (7) for preventing foreign matters from entering the fan and improving the safety of the fan during use.

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