Flow guide cover device capable of improving flow pushing efficiency

Abstract

The invention provides a flow guide cover device for improving flow pushing efficiency, the flow guide cover device is located on the outer side of an impeller of a submersible motor, and the flow guide cover device comprises a flow guide shell fixing seat, a front guide vane and a flow guide shell; the flow guide shell fixing base is located on a shell of the submersible motor, the flow guide shell is supported on the flow guide shell fixing base through the front guide vane, the front guide vane is located in front of an inlet of the impeller, and the tangential speed of the front guide vane is opposite to the tangential speed of the impeller and used for counteracting the circumferential speed of jet flow generated by the impeller. The tangential speed of the front guide vane is opposite to the tangential speed of the impeller, so that the circumferential speed of jet flow can be effectively inhibited, and the flow pushing efficiency of the submersible mixer is improved.

Description

Technical Field

[0001] The invention relates to the technical field of submersible mixers, and in particular to a flow guide cover device for improving flow pushing efficiency. Background Art

[0002] Submersible mixers are widely used in sewage treatment, river management and other liquid mixing scenarios. Their main function is to generate high-speed jets through the mixing impeller to promote the flow of liquid. However, traditional submersible mixers have the problem of low flow efficiency in actual applications, and the energy of the jet generated by stirring decays quickly. In addition, in conventional designs, due to the lack of effective guidance and control of the jet direction, adverse flow phenomena such as vortexes and backflows are prone to occur, further affecting the overall flow effect.

[0003] In the prior art, the guide cover device has been widely used in submersible mixers to improve their fluid pushing ability and jet efficiency. However, the ordinary guide cover can only guide the jet direction, but cannot eliminate the jet velocity circulation, which will lead to the rapid development and dissipation of turbulence, resulting in poor pushing effect. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a guide hood device for improving the plugging efficiency. By using the front guide vane, the circumferential velocity of the guide vane outlet is made opposite to the circumferential velocity of the impeller, which can effectively suppress the circumferential velocity of the jet and improve the plugging efficiency of the submersible mixer.

[0005] The present invention achieves the above technical objectives through the following technical means.

[0006] A guide cover device for improving flow pushing efficiency, the guide cover device is located outside the impeller of a submersible motor, the guide cover device comprises a guide shell fixing seat, a front guide vane and a guide shell; the guide shell fixing seat is located on the housing of the submersible motor, the guide shell is supported on the guide shell fixing seat through the front guide vane, the front guide vane is located in front of the inlet of the impeller, the circumferential speed of the front guide vane is opposite to the circumferential speed of the impeller, and is used to offset the circumferential speed of the jet generated by the impeller.

[0007] Furthermore, the guide housing fixing seat is a tapered structure along the flow direction, and the inlet diameter D2 of the guide housing fixing seat is equal to the housing diameter D of the submersible motor; the outlet diameter D4 of the guide housing fixing seat is equal to the hub diameter d of the impeller. h ; The hub retraction angle of the guide shell fixing seat

[0008] Furthermore, the guide casing includes a contraction section and a cylindrical section, the guide casing fixing seat and the front guide vane are located in the contraction section, the impeller is located in the cylindrical section, and the contraction section length l1 and the cylindrical section length l2 satisfy the following relationship:

[0009] l1=(0.3~0.6)d

[0010] l2=(0.4~0.8)d

[0011] Where: d is the impeller diameter.

[0012] Furthermore, the inlet diameter D1, the outlet diameter D3 of the guide shell and the contraction angle β1 of the contraction section satisfy the following relationship:

[0013] D1=D3+l1tanβ1

[0014] D3=d+(6~16)

[0015] β1=β2.

[0016] Further, the inlet placement angle α1 of the leading guide vane is 86-90°;

[0017] The outlet placement angle α2 of the leading guide vane satisfies the following relationship:

[0018] α2=-(α′2+Δα)

[0019]

[0020] Δα=0~3°

[0021] Where: α′2 is the outlet flow angle, unit: °; Δα is the angle of attack, unit: °; v m2 is the axial velocity of the guide vane outlet, in m / s; v u2 is the circumferential velocity of the guide vane outlet, in m / s; ψ2 is the displacement coefficient; Q is the flow rate; H is the head; n is the impeller speed, in rpm; η is the working efficiency of the submersible motor; z is the number of guide vanes.

[0022] Furthermore, the number of guide vanes of the front guide vanes is greater than the number of blades of the impeller, and the number of guide vanes z of the front guide vanes is coprime with the number of blades of the impeller, z∈(5,11).

[0023] Furthermore, the axial length of the front guide vane is l=(0.24-0.48)d; the distance between the outlet of the front guide vane and the impeller inlet is l3=(0.05-0.15)d.

[0024] The beneficial effects of the present invention are:

[0025] 1. The guide cover device of the submersible mixer described in the present invention can effectively suppress the circumferential velocity of the jet and improve the flow-pushing efficiency of the submersible mixer by making the circumferential velocity of the front guide vane opposite to the circumferential velocity of the impeller.

[0026] 2. The guide cover device of the submersible mixer described in the present invention has a front guide vane structure installed in the guide shell, which can not only eliminate the velocity circulation of the impeller jet and improve the flow-pushing efficiency, but also provide fixed support for the guide shell. The front guide vane structure provides reverse pre-swirl for the fluid entering the impeller, which can offset the circumferential velocity of the jet generated by the impeller, weaken the radial diffusion of the jet, and significantly improve the axial flow-pushing efficiency of the submersible mixer.

[0027] 3. The guide cover device of the submersible mixer described in the present invention can determine the main geometric parameters of the guide cover according to the parameters of the mixer. The main parameters of the guide shell include the inlet diameter D1, the outlet diameter D2, the axial length of the contraction section l1, the axial length of the cylindrical section l2, and the overall axial length L of the guide shell; the main parameters of the guide vane include the guide vane inlet placement angle α1, the guide vane outlet placement angle α2, the guide vane axial length l, and the number of guide vanes z; the guide shell fixing seat inlet diameter D2, the guide shell fixing seat outlet diameter D4, and the guide shell fixing seat contraction angle β2. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 The figure is a schematic structural diagram of the submersible mixer according to the present invention.

[0030] Figure 2 The figure is a schematic diagram of the structure of the air deflector described in the present invention.

[0031] Figure 3 This is the circumferential velocity flow field distribution diagram of the traditional submersible mixer device.

[0032] Figure 4 This is the axial velocity flow field distribution diagram of the traditional submersible mixer device.

[0033] Figure 5 This is a circumferential velocity flow field distribution diagram of the submersible mixer device described in the present invention.

[0034] Figure 6 This is a diagram of the axial velocity flow field distribution of the submersible mixer device described in the present invention.

[0035] In the figure:

[0036] 1-submersible motor; 2-guide casing fixing seat; 3-front guide vane; 4-guide casing; 5-impeller. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The output end of the submersible motor 1 of the submersible mixer in the prior art is equipped with an impeller 5, and a guide cover is supported on the housing of the submersible motor 1 by several brackets, and the impeller 5 is located inside the guide cover. This design guide cover can only guide the direction of the jet, but cannot eliminate the velocity circulation of the jet. Figure 1As shown, the guide cover device of the submersible mixer of the present invention is located outside the impeller 5 of the submersible motor 1, and the guide cover device includes a guide shell fixing seat 2, a front guide vane 3 and a guide shell 4; the guide shell fixing seat 2 is located on the housing of the submersible motor 1, and the guide shell 4 is supported on the guide shell fixing seat 2 through the front guide vane 3, and the front guide vane 3 is located in front of the inlet of the impeller 5. The circumferential speed of the front guide vane 3 is opposite to the circumferential speed of the impeller, so that the fluid entering the impeller provides a reverse circumferential speed to offset the circumferential speed of the jet generated at the impeller outlet, thereby reducing the radial diffusion of the jet of the submersible mixer and improving the flow efficiency. Compared with the traditional submersible mixer, the guide shell device of the present invention removes the traditional bracket support and adds the guide shell fixing seat 2 and the front guide vane 3, which can not only provide the reverse pre-swirl of the inlet fluid, but also play the role of supporting the guide cover.

[0041] The guide housing fixing seat 2 is a tapered structure along the flow direction. The inlet diameter D2 of the guide housing fixing seat 2 is equal to the shell diameter D of the submersible motor 1; the outlet diameter D4 of the guide housing fixing seat 2 is equal to the hub diameter d of the impeller 5. h The hub retraction angle of the guide housing fixing seat 2 Where l1 is the length of the contraction section.

[0042] The guide casing 4 includes a contraction section and a cylindrical section, the guide casing fixing seat 2 and the front guide vane 3 are located in the contraction section, the impeller 5 is located in the cylindrical section, and the contraction section length l1 and the cylindrical section length l2 satisfy the following relationship:

[0043] l1=0.3~0.6d

[0044] l2=0.4~0.8d

[0045] Where: d is the diameter of the impeller 5.

[0046] The inlet diameter D1, outlet diameter D3 of the guide shell 4 and the contraction angle β1 of the contraction section satisfy the following relationship:

[0047] D1=D3+l1tanβ1

[0048] D3=d+(6~16)

[0049] β1=β2.

[0050] The inlet placement angle α1 of the front guide vane 3 is 86-90°;

[0051] The outlet placement angle α2 of the leading guide vane 3 satisfies the following relationship:

[0052] α2=-(α′2+Δα)

[0053]

[0054] Δα=0~3°

[0055] Where: α′2 is the outlet flow angle, unit: °; Δα is the angle of attack, unit: °; v m2 is the axial velocity of the guide vane outlet, in m / s; v u2 is the circumferential velocity of the guide vane outlet, in m / s; ψ2 is the displacement coefficient; Q is the flow rate; H is the head; n is the impeller speed, in rpm; η is the working efficiency of the submersible motor; z is the number of guide vanes.

[0056] The number of guide vanes of the front guide vanes 3 is greater than the number of blades of the impeller 5 , and the number of guide vanes z of the front guide vanes 3 and the number of blades of the impeller are mutually prime, z∈(5,11).

[0057] The axial length of the front guide vane 3 is l=0.24-0.48d; the distance between the outlet of the front guide vane 3 and the impeller inlet is l3=0.05-0.15d.

[0058] Embodiment The diameter of the submersible motor 1 in this case is 155 mm, the diameter of the impeller 5 is 210 mm, the number of impeller blades is 2, the hub diameter is 72 mm, the impeller speed is 1400 rpm, the water inlet flow rate is 124 L / s, and the head is 2.85 m.

[0059] According to the above formula, the size of the guide shell fixing seat 2 is:

[0060] The inlet diameter of the guide shell fixing seat D2 = 155mm;

[0061] The outlet diameter of the guide shell fixing seat D4 = 72mm;

[0062] The shrinkage angle of the guide shell fixing seat β2=28.02°;

[0063] The dimensions of the guide shell 4 are:

[0064] The overall axial length of the guide shell is L = 180 mm;

[0065] The axial length of the contraction section l1 = 78 mm;

[0066] The axial length of the cylindrical section l2 = 102 mm;

[0067] The inlet diameter of the guide shell D1 = 320mm;

[0068] The outlet diameter of the guide shell D3 = 216mm;

[0069] The contraction angle of the contraction section β1 = 28.02°;

[0070] The dimensions of the front guide vane are:

[0071] The inlet placement angle of the leading guide vane is α1 = 90°;

[0072] α2 = -63.66°;

[0073] The axial length of the front guide vane is l = 54 mm;

[0074] The distance between the outlet of the front guide vane and the inlet of the impeller is l3=30 mm;

[0075] The number of guide vanes of the front guide vane is z=5;

[0076] like Figure 3 and Figure 4 The circumferential velocity flow field distribution diagram and axial velocity flow field distribution diagram of the traditional submersible mixer jet are shown in Figure 2. Figure 3 It can be seen from the figure that the circumferential velocity of the jet flow field of the traditional submersible mixer is relatively large, resulting in Figure 4 The axial velocity decays faster. Figure 5 and Figure 6 As shown, it can be clearly seen that the circumferential velocity in the jet flow field of the submersible mixer equipped with the guide cover device of the present invention is significantly suppressed, the axial velocity is significantly increased, and the flow-pushing effect is greatly improved. Compared with the hydraulic parameters, the axial propulsion distance of the submersible mixer is increased by 24%, the attenuation rate of the jet energy is reduced by 16% overall, and the flow-pushing efficiency is increased by 31% compared with the traditional device.

[0077] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0078] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flow guide cover device for improving flow-pushing efficiency, characterized in that: The guide cover device is located outside the impeller (5) of the submersible motor (1), and comprises a guide shell fixing seat (2), a front guide vane (3) and a guide shell (4); the guide shell fixing seat (2) is located on the housing of the submersible motor (1), and the guide shell (4) is supported on the guide shell fixing seat (2) through the front guide vane (3); the front guide vane (3) is located in front of the inlet of the impeller (5), and the tangential speed of the outlet of the front guide vane (3) is opposite to the tangential speed of the impeller, so as to offset the circumferential speed of the jet generated by the impeller.

2. The flow deflector device of the submersible mixer according to claim 1, characterized in that: The guide housing fixing seat (2) is a tapered structure along the flow direction; the inlet diameter D2 of the guide housing fixing seat (2) is equal to the housing diameter D of the submersible motor (1); the outlet diameter D4 of the guide housing fixing seat (2) is equal to the hub diameter d of the impeller (5). h The hub retraction angle of the guide housing fixing seat (2) 3. The deflector cover device of a submersible mixer according to claim 1, characterized in that: The guide casing (4) comprises a contraction section and a cylindrical section, the guide casing fixing seat (2) and the front guide vane (3) are located in the contraction section, the impeller (5) is located in the cylindrical section, and the contraction section length l1 and the cylindrical section length l2 satisfy the following relationship: l1＝(0.3～0.6)d l2＝(0.4～0.8)d Wherein: d is the diameter of the impeller (5).

4. The flow deflector device of the submersible mixer according to claim 3, characterized in that: The inlet diameter D1, the outlet diameter D3 and the contraction angle β1 of the contraction section of the guide shell (4) satisfy the following relationship: D1=D3+l1tanβ1 D3=d+(6~16) β1＝β2。 5. The flow deflector device of a submersible mixer according to claim 1, characterized in that: The inlet placement angle α1 of the front guide vane (3) is 86 to 90°; The outlet placement angle α2 of the front guide vane (3) satisfies the following relationship: α2=-(α′2+Δα) Δα=0~3° Where: α′2 is the outlet flow angle, unit: °; Δα is the angle of attack, unit: °; v m2 is the axial velocity of the guide vane outlet, in m / s; v u2 is the circumferential velocity of the guide vane outlet, in m / s; ψ2 is the displacement coefficient; Q is the flow rate; H is the head; n is the impeller speed, in rpm; η is the working efficiency of the submersible motor; z is the number of guide vanes.

6. The deflector cover device of the submersible mixer according to claim 5, characterized in that: The number of guide vanes of the front guide vanes (3) is greater than the number of blades of the impeller (5), and the number of guide vanes z of the front guide vanes (3) and the number of blades of the impeller are coprime, z∈(5,11).

7. The flow deflector device of a submersible mixer according to claim 1, characterized in that: The axial length of the front guide vane (3) is l=(0.24-0.48)d; the distance between the outlet of the front guide vane (3) and the inlet of the impeller is l3=(0.05-0.15)d.

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