Double-frame centrifugal fan blade

Abstract

The utility model relates to the field of centrifugal wind wheels, in particular to a double-frame centrifugal fan blade. The double-side-frame centrifugal fan blade comprises a disc body, a blade set at least arranged in the circumferential direction of the outer edge of the end face of one side of the disc body, and a first frame arranged on the outer side of the top of the blade set in a surrounding mode. A shaft sleeve used for being connected with a rotating shaft is arranged in the center of the disc body, an air cavity is formed between the blade set and the disc body, and an air inlet is formed in the inner side of the first frame. A second frame is arranged on the outer side of the blade set between the disc body and the first frame in a surrounding mode, and the outer edges of the blade set are connected in the circumferential direction through the second frame. According to the scheme, a double-frame connecting structure is adopted to achieve double fixing and supporting effects on the middle part and the top end of the fan blade.

Description

Technical Field

[0001] The utility model relates to the field of centrifugal wind wheels, in particular to a double-frame centrifugal wind blade. Background Art

[0002] Centrifugal fans drive the gas flow through the rotation of centrifugal blades, thereby achieving functions such as exhaust, ventilation, and cooling. Centrifugal fans are widely used in equipment such as air conditioners and vehicles, or in factories, mines, and other occasions.

[0003] There are two main types of centrifugal fan blades: single air inlet and double air inlet. The single air inlet is mainly composed of a disk body, a sleeve with an axial hole, a blade group and a frame. The blade groups are regularly arranged along the edge of one side of the disk body. A frame is provided on the outer end of the blade group, and the sleeve with an axial hole through which the motor shaft passes is set at the center of the middle disk. The double air inlet centrifugal fan blade is mainly composed of a middle disk, a sleeve with an axial hole, an upper blade group, a lower blade group and two frames. The upper blade group and the lower blade group are regularly arranged along the edges of both sides of the middle disk, and a frame is provided on the outer end of the upper blade group and the lower blade group. The sleeve with an axial hole through which the motor shaft passes is set at the center of the middle disk. For details, please refer to the prior patent schemes recorded in announcement numbers CN202326404U, CN201420710Y, and CN217129902U.

[0004] This case takes the double-inlet centrifugal fan blade as an example. As long as the height of the centrifugal fan blade connected by the traditional single frame exceeds the range of 250mm, the single frame will not play a big role in supporting and fixing the middle part of the blade. After the fan blade is injection molded, the fan blade will show obvious deformation. After installation, the fan blade will not run smoothly and there will be obvious shaking. During operation, due to the effect of wind pressure, the middle part of the blade will stretch and bulge outward. The fan blade has a low ultimate damage speed and a short long-term operation life.

[0005] In addition, the existing centrifugal fan blade has a sleeve side wall reinforcement rib arranged radially outward from the center of the circle. During operation, the wind resistance at the reinforcement rib position is relatively large, and a relatively obvious turbulence phenomenon will be generated, resulting in a high operating noise value. Summary of the invention

[0006] In order to solve the above problems, the purpose of the utility model is to provide a double-frame centrifugal fan blade, which adopts a double-frame connection structure to achieve dual fixing and supporting effects on the middle and top of the fan blade.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0008] A double-frame centrifugal fan blade comprises a disk body, a blade group arranged circumferentially along the outer edge of at least one end surface of the disk body, and a first frame enclosing the outer side of the top of the blade group; a sleeve for connecting the rotating shaft is constructed at the center of the disk body, a wind cavity is formed between the blade group and the disk body, and an air inlet is formed on the inner side of the first frame; it is characterized in that a second frame is enclosed on the outer side of the blade group between the disk body and the first frame, and the second frame circumferentially connects the outer edge of the blade group.

[0009] The utility model adopts the above-mentioned technical solution, which relates to a double-frame centrifugal fan blade, wherein at least one side of the disk of the double-frame centrifugal fan blade is provided with a blade group, and a first frame is arranged on the outer side of the top of the blade group. On this basis, this solution is provided with a second frame on the outer side of the blade group between the disk and the first frame, and the second frame circumferentially connects the outer edge of the blade group. The advantage of the centrifugal fan blade is that the structure is novel, and the top and middle of the blade are respectively connected to the first frame and the second frame; that is, a single-sided blade double-frame connection structure. The double-frame connection structure has a double fixing and supporting effect on the middle and top of the fan blade. Compared with the traditional single-frame connection centrifugal fan blade, it effectively reduces the deformation of the fan blade during the injection molding process and the operation process. The fan blade has high horizontality and concentricity, runs smoothly, and the limit breaking speed is increased by more than 30%.

[0010] In a specific embodiment, the second border is arranged to surround the outer side of the middle part of the blade assembly.

[0011] In a further refined scheme, the centrifugal wind wheel is a double-inlet centrifugal wind wheel, specifically, the disk body is a middle disk, and the blade groups are circumferentially arranged on the outer edges of the end faces on both sides of the disk body, and the blade groups on both sides are provided with a first frame and a second frame.

[0012] In a further refinement, the cross section of the first frame is a right-angled trapezoid, the thickness H1 of the first frame is 2.5-5 mm, preferably 3.5 mm; the length L1 of the top edge of the first frame is 8-11 mm, preferably 9.5 mm; the length L2 of the bottom edge of the first frame is 8-11 mm, preferably 11 mm, and the bottom edge length L2 is greater than the top edge length L1. The cross section of the second frame is an isosceles trapezoid, the thickness H2 of the second frame is 2.5-5 mm, preferably 3.5 mm; the length L3 of the top edge of the second frame is 3-6 mm, preferably 4 mm; the length L4 of the bottom edge of the second frame is 3-9 mm, preferably 6 mm.

[0013] Preferably, a spiral reinforcement rib is constructed on one side end face of the disk body at the edge of the sleeve, and the spiral direction of the spiral reinforcement rib from inside to outside is opposite to the bending direction of the blade from inside to outside. In the scheme here, a spiral reinforcement rib is arranged circumferentially on the edge of the sleeve, and the spiral direction of the spiral reinforcement rib from inside to outside is opposite to the bending direction of the blade from inside to outside. Under the premise of ensuring the strength of the liner wall and the wheel disc, the turbulence and wind resistance generated by the reinforcement rib during operation are reduced, and the noise value of the centrifugal fan blade during operation is effectively reduced.

[0014] Preferably, the width D of the spiral reinforcement rib is 2 to 3 mm, preferably 3 mm.

[0015] Preferably, the axial length of the centrifugal fan blade is greater than or equal to 250 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a double-frame schematic diagram of a single-inlet centrifugal fan blade.

[0017] Figure 2 It is a double-frame schematic diagram of a double-inlet centrifugal fan blade.

[0018] Figure 3 for Figure 2 A cross-sectional view of a double-inlet centrifugal fan blade is shown.

[0019] Figure 4 for Figure 3 Enlarged view of part A.

[0020] Figure 5 for Figure 3 Enlarged view of part B.

[0021] Figure 6 It is a schematic diagram of the end face of the centrifugal fan blade. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments 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.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] like Figures 1 to 6As shown, this embodiment relates to a double-frame centrifugal fan blade, including a disk body 1, and a blade group 2 arranged circumferentially along the outer edge of at least one end surface of the disk body 1, and a first frame 3 enclosed on the outer side of the top of the blade group 2. A sleeve 4 for connecting the rotating shaft is constructed at the center of the disk body 1, a wind cavity is formed between the blade group 2 and the disk body 1, and an air inlet is formed on the inner side of the first frame 3. A second frame 5 is enclosed on the outer side of the blade group 2 between the disk body 1 and the first frame 3, and the second frame 5 circumferentially connects the outer edge of the blade group 2. In a specific embodiment, the second frame 5 is enclosed on the outer side of the middle part of the blade group 2.

[0028] The disc body 1 of the double-frame centrifugal fan blade is provided with a blade group 2 on at least one side, and a first frame 3 is provided on the outer side of the top of the blade group 2. On this basis, this scheme is provided with a second frame 5 on the outer side of the blade group 2 between the disc body 1 and the first frame 3, and the second frame 5 circumferentially connects the outer edge of the blade group 2. The advantage of the centrifugal fan blade is that the structure is novel, and the top and middle of the blade are connected to the first frame 3 and the second frame 5 respectively. That is, a single-sided blade double-frame connection structure. The double-frame connection structure has a double fixing and supporting effect on the middle and top of the fan blade. Compared with the traditional single-frame connection centrifugal fan blade, it effectively reduces the deformation of the fan blade during the injection molding process and the operation process. The fan blade has high horizontality and concentricity, runs smoothly, and the limit breaking speed is increased by more than 30%.

[0029] The above scheme is applicable to single-inlet centrifugal wind wheels and double-inlet centrifugal wind wheels. When the centrifugal wind wheel is a double-inlet centrifugal wind wheel, the specific scheme is that the disk body 1 is a middle disk, and the blade groups 2 are circumferentially arranged on the outer edges of the end faces on both sides of the disk body 1, and the blade groups 2 on both sides are provided with a first frame 3 and a second frame 5.

[0030] In a further refined scheme, the cross section of the first frame 3 is a right-angled trapezoid, and the thickness H1 of the first frame 3 is 2.5-5 mm, preferably 3.5 mm. The length L1 of the top side of the first frame 3 is 8-11 mm, preferably 9.5 mm. The length L2 of the bottom side of the first frame 3 is 8-11 mm, preferably 11 mm, and the length L2 of the bottom side is greater than the length L1 of the top side. The cross section of the second frame 5 is an isosceles trapezoid, and the thickness H2 of the second frame 5 is 2.5-5 mm, preferably 3.5 mm. The length L3 of the top side of the second frame 5 is 3-6 mm, preferably 4 mm. The length L4 of the bottom side of the second frame 5 is 3-9 mm, preferably 6 mm.

[0031] like Figure 6As shown, a spiral reinforcement rib 6 is constructed on the end face of the disc body 1 on the edge of the sleeve 4, and the width D of the spiral reinforcement rib 6 is 2 to 3 mm, preferably 3 mm. The spiral direction of the spiral reinforcement rib 6 from inside to outside is opposite to the bending direction of the blade from inside to outside. In this scheme, a spiral reinforcement rib is arranged circumferentially on the edge of the sleeve 4, and the spiral direction of the spiral reinforcement rib 6 from inside to outside is opposite to the bending direction of the blade 21 from inside to outside, as shown in FIG. Figure 6 As shown in , the spiral direction of the spiral reinforcement rib 6 from the inside to the outside is counterclockwise, and the bending direction of the blade from the inside to the outside is clockwise. Under the premise of ensuring the strength of the shaft liner wall and the wheel disc, the scheme here reduces the turbulence and wind resistance generated by the reinforcement rib during operation, and effectively reduces the noise value of the centrifugal fan blade during operation.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 utility model. 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.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A double-frame centrifugal fan blade, comprising a disk body (1), a blade group (2) arranged circumferentially along the outer edge of at least one end surface of the disk body (1), and a first frame (3) arranged to surround the outer side of the top of the blade group (2); a sleeve (4) for connecting a rotating shaft is constructed at the center of the disk body (1), an air cavity is formed between the blade group (2) and the disk body (1), and an air inlet is formed on the inner side of the first frame (3); the characteristics are: A second frame (5) is arranged on the outside of the blade group (2) between the disk body (1) and the first frame (3), and the second frame (5) circumferentially connects the outer edge of the blade group (2).

2. The double-frame centrifugal fan blade according to claim 1, characterized in that: The second frame (5) is arranged to surround the outer side of the middle part of the blade assembly (2).

3. The double-frame centrifugal fan blade according to claim 2, characterized in that: The disk body (1) is a middle disk, and blade groups (2) are arranged circumferentially on the outer edges of the end surfaces on both sides of the disk body (1). The blade groups (2) on both sides are provided with a first frame (3) and a second frame (5).

4. The double-frame centrifugal fan blade according to claim 1, characterized in that: The cross section of the first frame (3) is a right-angled trapezoid, the thickness H1 of the first frame (3) is 2.5 to 5 mm, the length L1 of the top side of the first frame (3) is 8 to 11 mm, and the length L2 of the bottom side of the first frame (3) is 8 to 11 mm; the length L2 of the bottom side is greater than the length L1 of the top side; the cross section of the second frame (5) is an isosceles trapezoid, the thickness H2 of the second frame (5) is 2.5 to 5 mm, the length L3 of the top side of the second frame (5) is 3 to 6 mm, and the length L4 of the bottom side of the second frame (5) is 3 to 9 mm.

5. The double-frame centrifugal fan blade according to any one of claims 1 to 4, characterized in that: A spiral reinforcement rib (6) is constructed on one end surface of the disk body (1) at the edge of the sleeve (4), and the spiral direction of the spiral reinforcement rib (6) from inside to outside is opposite to the bending direction of the blade (21) from inside to outside.

6. The double-frame centrifugal fan blade according to claim 5, characterized in that: The width D of the spiral reinforcing rib (6) is 2 to 3 mm.

7. The double-frame centrifugal fan blade according to claim 3, characterized in that: The axial length of the centrifugal fan blade is greater than or equal to 250 mm.

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