Method for manufacturing a double-blade impeller for a range hood and the impeller manufactured therefrom

Abstract

The present invention discloses a method for manufacturing a double-blade impeller of a range hood and the impeller manufactured therefrom, wherein the structure consists of four parts: a first arc-shaped blade, a second arc-shaped blade, a blade fixing plate and a motor fixing plate. The first arc-shaped blade is provided with a tongue-shaped piece for fixing the blade; the second arc-shaped blade is provided with a keyway for fixing the blade; the first arc-shaped blade and the second arc-shaped blade are of equal width, and the second arc-shaped blade is nested on the first arc-shaped blade through the keyway during installation; the blade fixing plate is divided into a front plate of the blade fixing plate and a rear plate of the blade fixing plate, and the blade fixing plate is provided with an arc-shaped blade tongue-shaped hole for fixing the first arc-shaped blade; the motor fixing plate is provided with an arc-shaped blade tongue-shaped hole, a motor heat dissipation hole and a motor mounting hole. The design of the double-blade structure can reduce the pressure difference between the blade flow channels at the blade air inlet, eliminate the eddy current loss between the blade flow channels, increase the flow rate of the range hood, and reduce the working noise of the range hood.

Description

Technical Field

[0001] The invention relates to the technical field of range hoods, and in particular to a method for manufacturing a double-blade structure impeller for a range hood and the manufactured impeller. Background Art

[0002] With the gradual improvement of the living standards of the Chinese people, range hoods have become a must-have kitchen appliance in residents' homes. Most of the existing range hoods use multi-blade centrifugal fans, whose impeller structure consists of single arc blades distributed in annular shapes with equal spacing. When working, the smoke is sucked in axially from the center of the impeller and radially thrown out through the single arc blades distributed in annular shapes with equal spacing. This impeller structure is simple. When the smoke enters the blade flow channel from the center of the impeller, the blade air inlet is impacted by the high-speed airflow, which makes the air pressure distribution on the cross section of the blade air inlet uneven, and the air pressure difference is easily formed between the blade flow channels, causing the smoke to generate vortex cyclones between the blade flow channels, which not only reduces the working efficiency of the range hood, but also increases the working noise of the range hood. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method for manufacturing a double-blade impeller for a range hood and the impeller manufactured thereby. The double-blade structure design can reduce the air pressure difference between the blade flow channels at the blade air inlet, eliminate vortex cyclones between the blade flow channels, increase the flow rate of the range hood, and reduce the working noise of the range hood.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A method for manufacturing a double-blade impeller of a range hood, comprising:

[0006] According to the pressure distribution characteristics between the single arc blade flow passages, the profile of the second blade is approximately divided into three arc lines of unequal radius, namely B2, B3 and B4, wherein the arc radii of the arc lines B2 and B4 are equal to the arc radius of the first blade;

[0007] The arc line B3 adopts a non-uniform rational spline curve, and the curvature of the arc line B3 is adjusted by the control points P0, P1, P2, and P3 to gradually decrease from the blade air inlet side to the blade air outlet side; wherein, the distance between the control point P0 and the end point M of the first arc blade is 1 to 2 mm, and the distance between the control point P3 and the end point N of the first arc blade is 1 to 2 mm, the purpose of which is mainly to form the keyway of the second arc blade, so as to facilitate the fixing of the second arc blade; the control points P1 and P2 are respectively the two vertices of the isosceles right triangle OP1P2, and the length of the right angle side P2O is 5 to 6 mm, the purpose of which is mainly to control the curvature of the arc line B3 of the second arc blade, if the value is too small, it is not easy to install the second arc blade, and if the value is too large, it is easy to increase the resistance between the blade flow channels. The angle where the P2 point is located is a right angle, and the O point is the midpoint of the line connecting the two end points M and N of the first arc blade, and the line connecting the control points P1 and P2 is parallel to the line connecting the two end points M and N of the first arc blade.

[0008] A double-blade impeller for a range hood, comprising a first blade and a second blade manufactured by the manufacturing method of the double-blade impeller for a range hood as described above, wherein the first blade has an arc-shaped cross section and first connecting portions are provided at both ends in the length direction; the second blade has an arc-shaped cross section and second connecting portions are provided at both ends in the length direction; and further comprising:

[0009] The front plate of the blade fixing plate and the rear plate of the blade fixing plate are both in annular shape and have third connecting parts distributed at equal intervals along the annular shape; and,

[0010] The motor fixing plate has a truncated cone space for accommodating the motor in its middle and the outer circumference of the truncated cone space is annular, and the fourth connecting parts are evenly spaced on the outer circumference of the annular body, wherein:

[0011] The first connection part of the first blade and the second connection part of the second blade are installed and cooperated to form a double-blade structure. A plurality of double-blade structures are arranged between the front plate of the blade fixing plate and the rear plate of the blade fixing plate. The double-blade structure passes through the fourth connection part of the motor fixing plate. Specifically, the first connection part at one end of the double-blade structure is installed to the third connection part of the front plate of the blade fixing plate, and the first connection part at the other end of the double-blade structure is installed to the third connection part of the rear plate of the blade fixing plate.

[0012] As described above, in the double-blade impeller of the range hood, further, the first connecting portion is a flange extending in the length direction, and the outer side of the flange has a smooth boundary.

[0013] As described above, in the double-blade impeller for the range hood, further, the flange is a tongue-shaped piece.

[0014] As described above, in the double-blade impeller of the range hood, further, the third connecting portion is a tongue-shaped hole.

[0015] As described above, the double-blade impeller of the range hood, further, the fourth connecting portion is a tongue-shaped hole.

[0016] As described above, the double-blade impeller of the range hood, further, the second connecting portion has a groove bent inwardly.

[0017] As described above, in the double-blade impeller for the range hood, further, the first blade and the second blade have equal widths.

[0018] As described above, the double-blade impeller of the range hood, further, the distance between the motor fixing plate and the rear plate of the blade fixing plate is 2 / 5 of the width of the double-blade impeller.

[0019] As described above, the double-blade impeller of the range hood, further, the motor fixing plate is provided with motor heat dissipation holes and motor mounting holes.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the double-blade impeller structure designed by the present invention is simple in structure and easy to install; when working, the smoke is sucked in axially from the center of the impeller and radially thrown out through the airfoil blades distributed in an annular manner with equal spacing. Due to the design of the double-blade airfoil structure, when the smoke enters the blade flow channel from the center of the impeller, the convex part of the air inlet side of the second arc-shaped blade 2 fills part of the negative pressure area between the blade flow channels, reduces the air pressure difference between the blade flow channels, eliminates the vortex cyclone between the blade flow channels, reduces the vortex loss of the smoke inside the range hood, increases the flow rate of the range hood, increases the working static pressure of the range hood, and improves the working efficiency of the range hood. In addition, the design of the double-blade impeller reduces the working noise of the range hood and reduces the energy consumption of the motor of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a schematic structural diagram of a first arc-shaped blade according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of an arc line of a first arc-shaped blade according to an embodiment of the present invention;

[0024] Figure 3 is a schematic structural diagram of a second curved blade according to an embodiment of the present invention;

[0025] Figure 4is a schematic diagram of an arc line of a second arc-shaped blade according to an embodiment of the present invention;

[0026] Figure 5 A schematic structural diagram of a double-blade structure according to an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the structure of a blade fixing plate according to an embodiment of the present invention;

[0028] Figure 7 It is a structural schematic diagram of a motor fixing plate according to an embodiment of the present invention;

[0029] Figure 8 Schematic diagram of the structure of a double-blade impeller according to an embodiment of the present invention.

[0030] Among them: 1. first arc-shaped blade; 11. tongue-shaped piece; 2. second arc-shaped blade; 21. keyway; 3. blade fixing plate; 31. front plate of blade fixing plate; 32. rear plate of blade fixing plate; 33. first tongue-shaped hole; 4. motor fixing plate; 41. second tongue-shaped hole; 42. motor heat dissipation hole; 43. motor mounting hole; DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Example:

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of the embodiments of the present invention are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly defined. In addition, unless otherwise clearly defined and defined, 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 elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] A double-blade impeller of a range hood comprises four parts: a first arc-shaped blade 1, a second arc-shaped blade 2, a blade fixing plate 3 and a motor fixing plate 4.

[0038] The first arc blade 1 is provided with a tongue-shaped piece 11 for fixing the blade, and the blade is fixed to the blade fixing plate 3 in an annular manner with uniform spacing through the tongue-shaped piece 11. The first arc blade 1 is a single arc blade, and the blade inlet angle α formed by the tangent of the intersection of the blade arc line and the blade inlet diameter D1 is 90°, and the blade outlet angle β formed by the tangent of the intersection with the impeller outer diameter D2 is 155°; the thickness of the first arc blade 1 is 0.5 mm.

[0039] The second arc blade 2 is provided with a keyway 21 for fixing the blade. The second arc blade 2 is of the same width as the first arc blade 1. During installation, the second arc blade 2 is nested on the first arc blade 1 through the keyway 21 to form a double-blade structure, and then the multiple groups of double-blade structures composed of the first arc blade 1 and the second arc blade 2 are respectively passed through the tongue-shaped holes on the blade fixing plate 3 and the motor fixing plate 4 in turn, and then the tongue-shaped pieces 11 stretched out on both sides of the blade fixing plate 3 are bent 90° along the rotation direction of the impeller, and the blade fixing plate 3 and the motor fixing plate 4 are connected as a whole through the double-blade structure composed of multiple groups of first arc blades 1 and the second arc blade 2 to form a complete impeller. In order to reduce the weight of the impeller, the thickness of the second arc blade 2 is selected to be 0.3mm.

[0040] The method for determining the second curved blade 2-type line is as follows:

[0041] According to the pressure distribution characteristics between the single-arc blade flow channels, the profile of the second arc blade 2 is approximately divided into three segments (B2, B3, B4) of non-equal radius arc lines, wherein the arc radius of the arc lines B2 and B4 is equal to the arc radius of the first arc blade 1, the purpose of which is to form the keyway 21 of the second arc blade 2 at both ends of the first arc blade 1; the arc line B3 adopts a non-uniform rational spline curve, and the curvature of the arc line B3 is adjusted by control points P0, P1, P2, and P3 to gradually decrease from the blade air inlet side to the blade air outlet side. The distance between the control point P0 and the endpoint M of the first arc blade 1 is 1 to 2 mm, and the distance between the control point P3 and the endpoint N of the first arc blade 1 is 1 to 2 mm. The purpose is to mainly form the keyway of the second arc blade 2, which is convenient for fixing the second arc blade 2; the control points P1 and P2 are the two vertices of the isosceles right triangle OP1P2, and the length of the right angle side P2O is 5 to 6 mm. The purpose is to mainly control the curvature of the arc line B3 of the second arc blade 2. If the value is too small, it is not easy to install the second arc blade 2, and if the value is too large, it is easy to increase the resistance between the blade flow channels. The angle where the P2 point is located is a right angle, and the O point is the midpoint of the line connecting the two endpoints M and N of the first arc blade 1. The line connecting the control points P1 and P2 is parallel to the line connecting the two endpoints M and N of the first arc blade 1.

[0042] The blade fixing plate 3 is divided into a blade fixing plate front plate 31 and a blade fixing plate rear plate 32. The blade fixing plate front plate 31 and the blade fixing plate rear plate 32 are symmetrically distributed. A first tongue-shaped hole 33 is opened on the blade fixing plate 3 according to the shape of the tongue-shaped piece of the first arc-shaped blade 1, which is used to fix the first arc-shaped blade 1.

[0043] The motor fixing plate 4 is placed between the blade fixing plate front plate 31 and the blade fixing plate rear plate 32, and the distance from the blade fixing plate rear plate 32 is 2 / 5 of the impeller width. The motor fixing plate 4 is provided with a blade second tongue-shaped hole 41, a motor heat dissipation hole 42 and a motor mounting hole 43 according to the double-blade structural profile.

[0044] During operation, smoke is sucked in axially from the center of the impeller and radially ejected through the airfoil blades that are distributed in an annular pattern at equal intervals. Due to the design of the double-blade airfoil structure, when smoke enters the blade flow passage from the center of the impeller, the raised portion of the air inlet side of the second arc-shaped blade 2 fills part of the negative pressure area between the blade flow passages, reduces the pressure difference between the blade flow passages, eliminates the vortex cyclone between the blade flow passages, reduces the vortex loss of smoke inside the range hood, increases the flow rate of the range hood, increases the working static pressure of the range hood, and improves the working efficiency of the range hood. In addition, the design of the double-blade structure impeller reduces the working noise of the range hood and reduces the energy consumption of the motor of the range hood.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the essence of the content of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a double-blade impeller for a range hood, characterized in that: include: According to the pressure distribution characteristics between the single arc blade flow passages, the profile of the second blade is approximately divided into three arc lines of unequal radius, namely B2, B3 and B4, wherein the arc radii of the arc lines B2 and B4 are equal to the arc radius of the first blade; The arc line B3 adopts a non-uniform rational spline curve, and the curvature of the arc line B3 is adjusted by control points P0, P1, P2, and P3 to gradually decrease from the blade air inlet side to the blade air outlet side; wherein, the distance between the control point P0 and the endpoint M of the first arc blade is 1 to 2 mm, and the distance between the control point P3 and the endpoint N of the first arc blade is 1 to 2 mm; the control points P1 and P2 are respectively the two vertices of the isosceles right triangle OP1P2, the length of the right-angled side P2O is 5 to 6 mm, the angle at which the point P2 is located is a right angle, and the point O is the midpoint of the line connecting the two endpoints M and N of the first arc blade, and the line connecting the control points P1 and P2 is parallel to the line connecting the two endpoints M and N of the first arc blade.

2. A double-blade impeller for a range hood, characterized in that: The invention comprises a first blade and a second blade manufactured by the method for manufacturing a double-blade impeller for a range hood according to claim 1, wherein the first blade has an arc-shaped cross section and first connecting portions are provided at both ends in the length direction; the second blade has an arc-shaped cross section and second connecting portions are provided at both ends in the length direction; and further comprises: The front plate of the blade fixing plate and the rear plate of the blade fixing plate are both in annular shape and have third connecting parts distributed at equal intervals along the annular shape; and, The motor fixing plate has a truncated cone space for accommodating the motor in its middle and the outer circumference of the truncated cone space is annular, and the fourth connecting parts are evenly spaced on the outer circumference of the annular body, wherein: The first connection part of the first blade and the second connection part of the second blade are installed and cooperated to form a double-blade structure. A plurality of double-blade structures are arranged between the front plate of the blade fixing plate and the rear plate of the blade fixing plate. The double-blade structure passes through the fourth connection part of the motor fixing plate. Specifically, the first connection part at one end of the double-blade structure is installed to the third connection part of the front plate of the blade fixing plate, and the first connection part at the other end of the double-blade structure is installed to the third connection part of the rear plate of the blade fixing plate.

3. The double-blade impeller of the range hood according to claim 2, characterized in that: The first connection portion is a flange extending in the length direction, and the outer side of the flange has a smooth boundary.

4. The double-blade impeller of the range hood according to claim 3, characterized in that: The flange is a tongue-shaped piece.

5. The double-blade impeller of the range hood according to claim 4, characterized in that: The third connecting portion is a tongue-shaped hole.

6. The double-blade impeller of the range hood according to claim 4, characterized in that: The fourth connecting portion is a tongue-shaped hole.

7. The double-blade impeller of the range hood according to claim 2, characterized in that: The second connection portion has a groove bent inwardly.

8. The double-blade impeller of the range hood according to claim 2, characterized in that: The first blade and the second blade have equal width.

9. The double-blade impeller of the range hood according to claim 2, characterized in that: The distance between the motor fixing plate and the rear plate of the blade fixing plate is 2 / 5 of the width of the double-blade structure impeller.

10. The double-blade impeller of a range hood according to claim 2, characterized in that: The motor fixing plate is provided with motor heat dissipation holes and motor mounting holes.

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