Coupler-driven bidirectional air inlet three-dimensional flow fan

Abstract

A bidirectional air inlet three-dimensional flow fan driven by a coupler comprises a machine shell, an impeller is arranged in the center of the interior of the machine shell, the impeller is a three-dimensional flow impeller of a bidirectional air inlet structure, the impeller is fixed to a main shaft through a hub, the main shaft penetrates through the interior of the fan, and one end of the main shaft is connected with a motor through the coupler; the impeller comprises two front disc bodies, a shared rear disc body and a plurality of ternary twisted blades installed on the two sides of the rear disc body, the ternary twisted blade on any side is installed between the front disc body and the rear disc body, and the ternary twisted blades are evenly arranged on the two sides of the rear disc body in the circumferential direction at intervals and are in mirror symmetry. And the design molded line of the ternary twisted blade at the front disc body is deviated towards the rotating direction of the impeller compared with the design molded line at the rear disc body, so that the design molded line at the front disc body is not crossed with the design molded line at the rear disc body. The machining process of the blade is simpler, the production period and cost are reduced, and the air inflow of the fan is effectively increased through the design of bidirectional air inflow.

Description

Technical Field

[0001] The invention relates to the technical field of fans, and in particular to a coupling-driven two-way air intake three-way flow fan. Background Art

[0002] A fan is a fluid machine widely used in factories, mines, tunnels, cooling towers, boilers and industrial kilns, mainly for ventilation, dust removal and cooling. Common fans usually have single-sided air intake, and the impeller adopts a two-dimensional design, or an air intake box is added to guide the air intake when the air intake is on both sides, and a belt drive is adopted. The spatial distortion shape of conventional three-dimensional blades is relatively large, and its molding method requires the production of special blade pressure surface and suction surface molds, and the blades are heated and softened by induction heating equipment, and then hot-pressed to reduce the amount of springback during molding, forming a spatially distorted three-dimensional blade. The manufacturing process is complicated and the production cycle is long. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a two-way air intake three-way flow fan driven by a coupling, which can effectively increase the air intake volume of the fan and make the processing technology of the blades simpler.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a coupling-driven two-way air intake three-way flow fan, comprising a casing, an impeller is arranged at the center of the casing, the impeller is a three-way air intake structure The impeller is fixed to the main shaft through a hub, the main shaft runs through the inside of the fan, and one end of the main shaft is connected to the motor through a coupling; the impeller comprises two front discs, a common rear disc and a plurality of three-way twisted blades installed on both sides of the rear disc, the three-way twisted blades on either side are installed between the front disc and the rear disc, and the plurality of three-way twisted blades are evenly spaced and arranged in the circumferential direction on both sides of the rear disc and are mirror-symmetrical; the design line of the three-way twisted blade at the front disc is offset toward the rotation direction of the impeller than the design line at the rear disc, so that the design line at the front disc does not intersect with the design line at the rear disc.

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

[0006] Preferably, the side panels on both sides of the casing are respectively connected to the air inlet end of an 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, forming a sleeve-matching assembly relationship with the two front disk bodies.

[0007] Preferably, the radial clearance between the single-sided air inlet cone and the front disk is 2-10 mm, and the dimension of the single-sided air inlet cone inserted axially into the interior of the front disk is 5-15 mm.

[0008] Preferably, the radial gap between the single-sided air inlet cone tube and the front disk body is 2 mm, and the axial dimension of the single-sided air inlet cone tube inserted into the interior of the front disk body is 10 mm.

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

[0010] Preferably, in the height direction, the upper end of the three-dimensional twisted blade is inclined toward the rotation direction, and the number of the three-dimensional twisted blades on one side is n, where n is an integer and 8≤n≤16.

[0011] Preferably, the number of the single-sided three-dimensional twisted blades is 16.

[0012] Preferably, a reinforcement plate 15 is welded at the middle of the three-dimensional twisted blade, and the inclination angle of the reinforcement plate 15 is 5° to 10°.

[0013] Preferably, an inlet pressure net is provided at the inlet end of the air inlet cone to prevent foreign matter from entering the fan and causing damage, thereby improving the safety of the fan during use.

[0014] According to the above technical solution, the beneficial effects of the present invention are: 1. The blades in the present invention adopt single-plate twisted blades instead of traditional airfoil blades, which not only reduces the weight of the whole machine, but also reduces the separation loss of the blade wall; and the blades in the present invention can be three-dimensionally formed by the method of tilting and inverting the blades instead of the traditional processing technology, without the need for special molds and heating equipment for hot pressing, the processing technology is simpler, and the production cycle and cost are reduced.

[0015] 2. The present invention significantly increases the air intake volume of the fan and improves the efficiency of the fan by designing the air inlets on both sides of the fan to be directly connected to the atmosphere.

[0016] 3. The present invention adopts a coupling transmission form, which improves the transmission efficiency, can withstand a larger torque, achieves an improvement in the performance of the fan, and ensures stable operation. At the same time, the structure is simple and compact and easy to maintain.

[0017] 4. The present invention adopts a two-way air intake three-dimensional flow impeller. The three-dimensional flow impeller is designed based on the three-dimensional flow theory. It performs infinite division in the three-dimensional space inside the impeller and establishes a complete dynamic model, thereby optimizing the airflow process of each cross section, reducing energy loss, and optimizing fan performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the general assembly diagram of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 for Figure 2 Schematic diagram of the structure of the middle impeller; Figure 4 It is a schematic diagram of the design profile of the blade on the rear disc; Figure 5 Schematic diagram of the design profile of the blades on the front disk.

[0019] Markings in the figure: 1. casing, 2. impeller, 3. air inlet cone, 4. coupling, 5. motor, 6. main shaft, 7. inlet pressure screen, 8. front disk, 9. three-dimensional twisted blades, 10. rear disk, 11. first upper arc line, 12. second upper arc line, 13. first lower arc line, 14. second lower arc line, 15. reinforcement plate. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] 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 persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0022] At the same time, it should be noted that, unless otherwise specified, the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Changes or adjustments in their relative relationships, without substantial changes in the technical content, should also be regarded as the scope of the present invention. In addition, the terms "first" and "second" and the like are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] like Figures 1 to 3 As shown, a coupling-driven two-way air intake three-way flow fan includes a casing 1, an impeller 2, two air intake cones 3, a coupling 4, a motor 5, a main shaft 6, an inlet pressure screen 7 and a reinforcement plate 15.

[0024] The housing 1 is divided into upper and lower parts, which is convenient for installation, disassembly and maintenance.

[0025] An impeller 2 is arranged at the center of the casing 1. The impeller 2 is fixed on the main shaft 6 through a hub. The main shaft 6 runs through the entire interior of the fan. One end of the main shaft 6 is connected to the motor 5 through a coupling 4. The motor 5 drives the main shaft 6 and the impeller 2 on the main shaft 6 to rotate through the coupling 4.

[0026] Impeller 2 is a three-dimensional flow impeller with a two-way air intake structure. The three-dimensional flow impeller 2 is designed based on the three-dimensional flow theory. Infinite division is performed in the three-dimensional space inside the impeller 2 to establish a complete dynamic model, thereby optimizing the airflow process of each cross section, reducing energy loss and improving fan efficiency.

[0027] The impeller 2 includes two front disc bodies 8, a common rear disc body 10 and a plurality of three-dimensional twisted blades 9 installed on both sides of the rear disc body 10. The three-dimensional twisted blades 9 on either side are installed between the front disc body 8 and the rear disc body 10. The plurality of three-dimensional twisted blades 9 are evenly spaced in the circumferential direction on both sides of the rear disc body 10 and are mirror-symmetrical.

[0028] In this embodiment, the three-dimensional twisted blade 9 is connected to the rear disc body by welding.

[0029] 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 line located at the front disc body 8 and the design line located at the rear disc body 10. Further, the number of the three-dimensional twisted blades 9 on one side is n, n is an integer, and 8≤n≤16; in this embodiment, the best embodiment parameter is: the number of the three-dimensional twisted blades on one side is 16.

[0030] The design profile of the front disc 8 and the design profile of the rear disc 10 are both composed of two tangent arcs in the same direction. Specifically, the design profile of the front disc 8 is composed of a first upper arc and a second upper arc, and the design profile of the rear disc 10 is composed of a first lower arc and a second lower arc. Further, the radius of the second upper arc is 1.5 to 2.5 times the radius of the first upper arc; the radius of the second lower arc is 1.5 to 2.5 times the radius of the first lower arc. R1 is the radius of the first upper arc 11, R2 is the radius of the second upper arc 12, R3 is the radius of the first lower arc 13, and R4 is the radius of the second lower arc 14; in this embodiment, the best embodiment parameters are: the ratio of R2 to R1 is 2.19, and the ratio of R4 to R3 is 2. The first upper arc and the first lower arc play the role of catering to the airflow intake angle and driving the airflow to turn, and the second upper arc and the second lower arc play the role of increasing pressure and ensuring the stable growth of static pressure.

[0031] The side panels on both sides of the casing 1 are respectively opened with holes, and the opening positions are respectively connected and assembled with the air inlet end of an air inlet cone 3. In this embodiment, the connection and assembly method of the side panels on both sides of the casing 1 and the air inlet cone 3 is welding or bolt connection.

[0032] The convergent ends of the two air inlet cones 3 are respectively inserted into the air inlet ends on both sides of the impeller 2, and respectively form a sleeve-matching assembly relationship with the two front discs 8. Further, the radial clearance between the single-side air inlet cone 3 and the front disc 8 is 2 to 10 mm, and the axial insertion dimension inside the front disc 8 is 5 to 15 mm. In this embodiment, the best embodiment parameters are: the radial clearance is 2 mm, and the axial insertion dimension inside the front disc 8 is 10 mm.

[0033] like Figure 4 and Figure 5 As shown, the design line of the three-dimensional twisted blade 9 at the front disc body 8 is offset toward the rotation direction of the impeller 2 compared with the design line at the rear disc body 8, so that the design line at the front disc body 8 does not intersect with the design line at the rear disc body 10.

[0034] In this embodiment, α1 is defined as the inlet angle of the design profile at the front disc 8, β1 is defined as the outlet angle of the design profile at the front disc 8, α2 is defined as the inlet angle of the design profile at the rear disc 10, and β2 is defined as the outlet angle of the design profile at the rear disc 10. Specifically, α1<α2, to reduce the airflow inlet angle of attack on the front disc side; β1<β2, to improve the efficiency of the impeller 2. It should be noted that the detailed definition of the inlet angle and outlet angle described in this embodiment can refer to the content disclosed in Chinese patent CN 110439834A; this definition is not an improvement point of this application, and this application will not repeat it.

[0035] In this embodiment, the blades can be three-dimensionally formed by tilting and inverting the blades instead of the traditional processing technology, without the need for special molds and heating equipment for hot pressing, making the production simpler and shortening the production cycle.

[0036] A reinforcement plate 15 is welded to the middle of the three-dimensional twisted blades 9 on both sides of the rear disc body 10, and the inclination angle of the reinforcement plate 15 is 5° to 10°.

[0037] The inlet end of the air inlet cone 3 is provided with an inlet pressure net 7 to prevent foreign matter from entering the fan and causing damage, thereby improving the safety of the fan during use. Preferably, the pressure net material of the inlet pressure net 7 is ordinary steel wire woven mesh, which is convenient to manufacture.

[0038] It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A coupling-driven two-way air intake three-way flow fan, comprising a housing (1), characterized in that: An impeller (2) is arranged at the center of the casing (1); the impeller (2) is a three-dimensional flow impeller with a two-way air intake structure; the impeller (2) is fixed to a main shaft (6) via a hub; the main shaft (6) runs through the interior of the fan; one end of the main shaft (6) is connected to a motor (5) via a coupling (4); The impeller (2) comprises two front disc bodies (8), a common 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 either 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 spaced and arranged in a circumferential direction on both sides of the rear disc body (8) and are mirror-symmetrical; The design profile of the three-dimensional twisted blade (9) at the front disc body (8) is offset in the rotation direction of the impeller (2) compared to the design profile at the rear disc body (8), so that the design profile at the front disc body (8) does not intersect with the design profile at the rear disc body (10).

2. The coupling-driven two-way air intake three-way flow fan according to claim 1, characterized in that: The design profile of the front disc body (8) and the design profile of the rear disc body (10) are both composed of two tangent arcs in the same direction, that is, the profile of the front disc body (8) is composed of a first upper arc line (11) and a second upper arc line (12), and the profile of the rear disc body (10) is composed of a first lower arc line (13) and a second lower arc line (14); the radii of the second upper arc line (12) and the second lower arc line (14) are 1.5 to 2.5 times the radii of the first upper arc line (11) and the first lower arc line (13), respectively.

3. The coupling-driven two-way air intake three-way flow fan according to claim 1, characterized in that: The side panels on both sides of the casing (1) are respectively connected to the air inlet end of an air inlet cone tube (3), and the convergent ends of the two air inlet cone tubes (3) are respectively inserted into the air inlet ends on both sides of the impeller (2), and respectively form a sleeve-matched assembly relationship with the two front disc bodies (8).

4. The coupling-driven two-way air intake three-way flow fan according to claim 3, characterized in that: The radial clearance between the single-sided air inlet cone tube (3) and the front disc body (8) is 2 to 10 mm, and the dimension of the single-sided air inlet cone tube (3) inserted axially into the interior of the front disc body (8) is 5 to 15 mm.

5. The coupling-driven two-way air intake three-way flow fan according to claim 4, characterized in that: The radial clearance between the single-sided air inlet cone tube (3) and the front disc body (8) is 2 mm, and the axial dimension of the single-sided air inlet cone tube (3) inserted into the interior of the front disc body (8) is 10 mm.

6. The coupling-driven two-way air intake three-way flow fan according to claim 1, characterized in that: The three-dimensional twisted blade (9) is a single-plate spatial twisted blade, which is generated by lofting the design profile line at the front disc body (8) and the design profile line at the rear disc body (10).

7. The coupling-driven two-way air intake three-way flow fan according to claim 1, characterized in that: The number of the single-sided three-element twisted blades (9) is n, where n is an integer and 8≤n≤16.

8. The coupling-driven two-way air intake three-way flow fan according to claim 7, characterized in that: The number of the single-sided three-dimensional twisted blades (9) is 16.

9. The coupling-driven two-way air intake three-way flow fan according to claim 7, characterized in that: A reinforcement plate (15) is welded to the middle of the three-dimensional twisted blade (9), and the inclination angle of the reinforcement plate (15) is 5° to 10°.

10. The coupling-driven two-way air intake three-way flow fan according to claim 1, characterized in that: An inlet pressure net (7) is provided at the inlet end of the air inlet cone (3) to prevent foreign matter from entering the fan and causing damage, thereby improving the safety of the fan during use.

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