A variable-inclination centrifugal impeller

Abstract

The present application relates to the technical field of impellers, and in particular to a variable-inclination centrifugal impeller, comprising a chassis, a frame and blades; the middle portion of the frame is an air inlet, and a rotating shaft is provided in the middle portion of the chassis close to the frame, and the rotating shaft is used to connect an external driving shaft; the blades are arranged between the frame and the chassis, and the blades are arranged equidistantly around the rotating shaft, and an air outlet is formed between the blades; the blades are composed of a conformal segment and a deformed segment, the conformal segment is located on the side close to the chassis, and the deformed segment is located between the frame and the conformal segment; the thickness of the deformed segment gradually becomes thinner in the direction from one side of the chassis to one side of the frame, and the projection area of ​​the top of the deformed segment is located within the projection area of ​​the conformal segment; the present invention can effectively improve the aerodynamic performance of the fan, improve the pressure distribution on the upper end surface of the blade, and has the effect of improving the work efficiency of the impeller and reducing the weight of the blade.

Description

Technical Field

[0001] The invention relates to the technical field of impellers, in particular to a variable-inclination centrifugal impeller. Background Art

[0002] The centrifugal impeller is used to be installed inside the centrifugal fan, which is generally used for ventilation or refrigeration devices such as air conditioners, refrigerators, and exhaust fans. The blades of the traditional centrifugal impeller are arranged so that the blade cross-section profile in the axial direction of the impeller is the same, and the inlet angle of attack is small, resulting in weak work in the blade channel area at the top of the impeller, low overall work efficiency of the impeller, and small air volume. Summary of the invention

[0003] In view of the above-mentioned defects, the purpose of the present invention is to propose a variable-inclination centrifugal impeller, which adopts a superimposed design of multiple blade shapes for each blade on the impeller, which can effectively improve the aerodynamic performance of the fan, improve the pressure distribution on the upper surface of the blade, and has the effect of improving the working efficiency of the impeller and reducing the weight of the blade.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A variable-inclination centrifugal impeller comprises a base plate, a frame and blades;

[0006] The middle part of the frame is an air inlet, and the middle part of the chassis close to the frame is provided with a rotating shaft, and the rotating shaft is used to connect to an external driving shaft;

[0007] The blades are arranged between the frame and the chassis, the blades are arranged equidistantly around the rotation axis, and air outlets are formed between the blades;

[0008] The blade consists of a conformal segment and a deformation segment, the conformal segment is located on the side close to the chassis, and the deformation segment is located between the frame and the conformal segment; the thickness of the deformation segment gradually becomes thinner in the direction from the chassis side to the frame side, and the projection area of ​​the top of the deformation segment in the direction perpendicular to the chassis is located within the projection area of ​​the conformal segment in the direction perpendicular to the chassis.

[0009] Preferably, the front and back sides of the blade are both arc surfaces bent toward the same side, the front contour of the deformation segment coincides with the front contour of the conformal segment, the bottom of the deformation segment coincides with the top of the conformal segment and are connected to each other, and the back side of the deformation segment gradually narrows toward the front side.

[0010] Preferably, the thickness of the thinnest part of the top of the deformation segment is LA1, and the maximum thickness is LA2; the thickness of the thinnest part of the conformal segment is LB1, and the maximum thickness is LB2, wherein 0<LA2-LA1<(LB2-LB1) / 2.

[0011] Preferably, the thickness LA1 of the thinnest part of the top of the deformation section is in the range of 0.6 mm-1 mm.

[0012] Preferably, the height of the isomorphic segment is H1, the total height of the blade is H, and 1 / 3H≤H1≤3 / 4H.

[0013] Preferably, the outer side wall of the rotating shaft is provided with a plurality of reinforcing ribs, one end of the reinforcing rib is connected to the chassis, and the other end extends along the axial direction of the rotating shaft, and the plurality of reinforcing ribs are arranged equidistantly around the rotating shaft.

[0014] Preferably, the bottom of the reinforcing rib is connected to the chassis, and the width of the bottom of the reinforcing rib is greater than the width of the top thereof.

[0015] Preferably, the impeller is made of plastic and is integrally formed.

[0016] The above technical solution has the following beneficial effects:

[0017] The variable-inclination centrifugal impeller of this embodiment adopts a variety of blade superposition designs on the same blade, while the blades of the traditional centrifugal impeller are set to have the same blade cross-sectional profile in the axial direction of the impeller. Compared with the blade design of the traditional household plastic centrifugal impeller, the variable-inclination centrifugal impeller of this embodiment can effectively improve the aerodynamic performance of the fan and improve the pressure distribution on the upper surface of the blade. For the weaker working blade channel area at the top of the impeller (blade profile interval A), the adjustment range of the inlet attack angle of the blade in this embodiment is larger, so that under the premise of ensuring the same performance of the main blade profile interval, the working effect of the weaker blade profile area in the impeller is improved, thereby making the impeller more suitable for complex fan internal flow design. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the blade profile dimensions of the blade in the present invention;

[0020] Figure 3 It is a schematic diagram of the vertical distribution of the blade profile of the blade in the present invention;

[0021] Figure 4The flow channel velocity cloud diagrams of the variable-skew centrifugal impeller of this embodiment are compared with those of the conventional impeller based on the B blade type, wherein (a) is the flow channel velocity cloud diagram of the variable-skew centrifugal impeller in the B blade type interval, and (b) is the flow channel velocity cloud diagram of the conventional impeller in the same height interval; (c) is the flow channel velocity cloud diagram of the variable-skew centrifugal impeller in the AB blade type interval, and (d) is the flow channel velocity cloud diagram of the conventional impeller in the same height interval; (e) is the flow channel velocity cloud diagram of the variable-skew centrifugal impeller in the A blade type interval, and (f) is the flow channel velocity cloud diagram of the conventional impeller in the same height interval.

[0022] Among them: 1. chassis; 11. rotating shaft; 2. frame; 21. air inlet; 3. blades; 31. shaped section; 32. deformed section; 4. air outlet; 5. reinforcing ribs. DETAILED DESCRIPTION

[0023] 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" 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. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and are used to distinguish and describe features, without distinction of order or importance.

[0025] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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.

[0027] Combine the following Figures 1 to 4A variable-inclination centrifugal impeller according to an embodiment of the present invention is described, comprising a base plate 1, a frame 2 and blades 3;

[0028] The middle part of the frame 2 is an air inlet 21, and the middle part of the chassis 1 close to the frame 2 is provided with a rotating shaft 11, and the rotating shaft 11 is used for externally connecting a driving shaft;

[0029] The blades 3 are arranged between the frame 2 and the chassis 1, and the blades 3 are arranged equidistantly around the rotation axis 11, and air outlets 4 are formed between the blades 3;

[0030] The blade 3 is composed of a conformal segment 31 and a deformation segment 32, wherein the conformal segment 31 is located on a side close to the chassis 1, and the deformation segment 32 is located between the frame 2 and the conformal segment 31; the thickness of the deformation segment 32 gradually becomes thinner in the direction from the side of the chassis 1 to the side of the frame 2, and the projection area of ​​the top of the deformation segment 32 in the direction perpendicular to the chassis 1 is located within the projection area of ​​the conformal segment 31 in the direction perpendicular to the chassis 1.

[0031] Specifically, Figure 2 As shown, the cross-sectional profile of the conformal segment 31 is L2, which is defined as a B-leaf profile; the profile of the top of the deformed segment 32 is L1, which is defined as an A-leaf profile, and the projection of L1 is located inside the projection of L2.

[0032] The impeller is used to be installed inside the fan, and a plurality of blades 3 are arranged on the impeller. One side of the chassis 1 is the bottom of the impeller, and one side of the frame 2 is the top of the impeller. The variable-inclination centrifugal impeller of this embodiment adopts a plurality of blade-shaped superimposed designs on the same blade 3, while the blades 3 of the traditional centrifugal impeller are arranged to have the same blade-shaped cross-sectional profile in the axial direction of the impeller. Compared with the blade-shaped design of the traditional household plastic centrifugal impeller, the variable-inclination centrifugal impeller of this embodiment can effectively improve the aerodynamic performance of the fan and improve the pressure distribution on the upper surface of the blade 3. For the weaker working blade channel area at the top of the impeller (blade-shaped interval A), the adjustment range of the inlet angle of attack of the blade in this embodiment is larger, so that the working effect of the weaker performance A blade-shaped area in the impeller is improved while ensuring the same performance of the main body B blade-shaped interval, thereby making the impeller more suitable for complex fan internal flow design.

[0033] Preferably, the front and back sides of the blade 3 are both arc surfaces bent toward the same side, the front contour of the deformation segment 32 coincides with the front contour of the conformal segment 31, the bottom of the deformation segment 32 coincides with the top of the conformal segment 31 and are connected to each other, and the back side of the deformation segment 32 gradually narrows toward the front side.

[0034] Specifically, the front side of the blade 3 is the windward side, the back side of the blade 3 is the leeward side, and the blade 3 is bent from the largest diameter of the impeller toward the inside of the impeller and toward the front side of the blade 3. Figure 4As shown, (a) is the flow channel velocity cloud diagram of the variable-skew centrifugal impeller in the B blade section, (b) is the flow channel velocity cloud diagram of the traditional impeller in the same height section; (c) is the flow channel velocity cloud diagram of the variable-skew centrifugal impeller in the AB blade section, (d) is the flow channel velocity cloud diagram of the traditional impeller in the same height section; (e) is the flow channel velocity cloud diagram of the variable-skew centrifugal impeller in the A blade section, (f) is the flow channel velocity cloud diagram of the traditional impeller in the same height section;

[0035] As shown in the figure, the air flow state in the B blade area has not changed significantly, and its main vortex and high-speed area perform similarly;

[0036] The air flow in the AB blade section changes, which is mainly manifested in the strengthening of the main airflow near the outlet 4 of the variable-skew centrifugal impeller, and the adjustment of the inlet angle of attack at the air inlet 21 of the impeller makes the air flow inside the impeller more uniform, and the high-speed area of ​​the impeller outlet 4 is expanded;

[0037] The air flow in the A blade section is significantly improved, which is manifested by the obvious increase in the high-speed area of ​​the main airflow near the outlet 4 of the variable-inclined centrifugal impeller, the reduction of the vortex near the wall, and the suppression of the airflow separation in each blade section, and the improvement of the overall section flow.

[0038] In summary, the variable-skew centrifugal impeller of this embodiment can improve the aerodynamic performance of the impeller along the axial AB and A blade intervals by changing the blade profile. According to actual test experiments, under the same speed state, under the condition of unchanged impeller energy consumption, the air volume of the variable-skew centrifugal impeller can be increased by 2%-3%, which has great use value for fan energy saving and improving static pressure conditions.

[0039] Preferably, the thinnest part of the top of the deformation segment 32 has a thickness of LA1 and a maximum thickness of LA2; the thinnest part of the conformal segment 31 has a thickness of LB1 and a maximum thickness of LB2, wherein 0<LA2-LA1<(LB2-LB1) / 2.

[0040] Preferably, the thickness LA1 of the thinnest part of the top of the deformation section 32 is in the range of 0.6 mm-1 mm.

[0041] Specifically, the thickness design of blade 3 in this embodiment is combined with the lightweight design requirements of the impeller blade shape. Under the premise of ensuring the strength standard of household plastic impellers, the actual deformation effect is taken into account to obtain a new type of variable-inclination centrifugal impeller that can improve aerodynamic performance and has lightweight characteristics. The weight reduction effect of blade 3 can reach 7%-9%, which improves the utilization rate of production materials and is conducive to energy-saving production and manufacturing and sustainable development of environmentally friendly manufacturing.

[0042] Preferably, the height of the shaped segment 31 is H1, the total height of the blade 3 is H, and 1 / 3H≤H1≤3 / 4H.

[0043] Specifically, the shape of the blade 3 is a B blade type in the H1 range, and is an A blade type at the connection between the top of the blade 3 and the frame 2; in the height range H2 (H1<H2<H) of the blade 3, it is a transition from the B blade type to the A blade type, which is defined as the AB blade type.

[0044] Preferably, the outer side wall of the rotating shaft 11 is provided with a plurality of reinforcing ribs 5 , one end of the reinforcing rib 5 is connected to the chassis 1 , and the other end extends along the axial direction of the rotating shaft 11 , and the plurality of reinforcing ribs 5 are arranged equidistantly around the rotating shaft 11 .

[0045] Specifically, because the impeller as a whole is connected to the external drive shaft through the rotating shaft 11, and the impeller itself has weight, the impeller may also deviate and shake due to centrifugal force during rotation. Compared with the traditional centrifugal impeller, the present embodiment adds reinforcing ribs 5 on the rotating shaft 11, which can improve the connection strength between the rotating shaft 11 and the chassis 1, so that the rotating shaft 11 is not easy to deform when the impeller is in use, and it is not easy to cause the rotating shaft 11 to deform or break. In this embodiment, the number of reinforcing ribs 5 is set to five, which can better disperse the force.

[0046] Preferably, the bottom of the reinforcing rib 5 is connected to the chassis 1 , and the width of the bottom of the reinforcing rib 5 is greater than the width of the top thereof.

[0047] Specifically, the width of the bottom of the reinforcing rib 5 is greater than the width of the top thereof, so that the bottom has better load-bearing capacity and has better force-bearing and buffering effects.

[0048] Preferably, the impeller is made of plastic and is integrally formed.

[0049] Specifically, the novel centrifugal impeller of the present embodiment is manufactured by integral injection molding, eliminating the assembly process and improving the utilization rate of manufacturing materials and production efficiency.

[0050] Other structures and operations of a variable-inclination centrifugal impeller according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0051] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A variable-inclination centrifugal impeller, characterized in that: Including chassis, frame and blades; The middle part of the frame is an air inlet, and the middle part of the chassis close to the frame is provided with a rotating shaft, and the rotating shaft is used to connect to an external driving shaft; The blades are arranged between the frame and the chassis, the blades are arranged equidistantly around the rotation axis, and air outlets are formed between the blades; The blade is composed of a conformal segment and a deformed segment, wherein the conformal segment is located on a side close to the chassis, and the deformed segment is located between the frame and the conformal segment; the thickness of the deformed segment gradually becomes thinner in the direction from the chassis side to the frame side, and the projection area of ​​the top of the deformed segment in the direction perpendicular to the chassis is located within the projection area of ​​the conformal segment in the direction perpendicular to the chassis; The front and back sides of the blade are both arc surfaces that bend toward the same side, the front contour of the deformed section coincides with the front contour of the conformal section, the bottom of the deformed section coincides with the top of the conformal section and are connected to each other, and the back side of the deformed section gradually narrows toward the front side in the direction from the chassis side to the frame side; The front side of the blade is the windward side, and the back side of the blade is the leeward side; The thinnest part of the top of the deformation segment has a thickness of LA1 and a maximum thickness of LA2; the thinnest part of the conformal segment has a thickness of LB1 and a maximum thickness of LB2, wherein 0<LA2-LA1<(LB2-LB1) / 2; The height of the shaped segment is H1, the total height of the blade is H, and 1 / 3H≤H1≤3 / 4H.

2. The variable-inclination centrifugal impeller according to claim 1, characterized in that: The thickness LA1 of the thinnest part of the top of the deformation section ranges from 0.6 mm to 1 mm.

3. The variable-inclination centrifugal impeller according to claim 1, characterized in that: The outer side wall of the rotating shaft is provided with a plurality of reinforcing ribs, one end of the reinforcing rib is connected to the chassis, and the other end extends along the axial direction of the rotating shaft, and the plurality of reinforcing ribs are arranged equidistantly around the rotating shaft.

4. The variable-inclination centrifugal impeller according to claim 3, characterized in that: The bottom of the reinforcing rib is connected to the chassis, and the width of the bottom of the reinforcing rib is greater than the width of the top thereof.

5. The variable-inclination centrifugal impeller according to claim 1, characterized in that: The material of the impeller is plastic, and the impeller is integrally formed.

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