CN209781290U - Cross-flow fan blade and fan blade unit thereof - Google Patents
Cross-flow fan blade and fan blade unit thereof Download PDFInfo
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- CN209781290U CN209781290U CN201920425173.6U CN201920425173U CN209781290U CN 209781290 U CN209781290 U CN 209781290U CN 201920425173 U CN201920425173 U CN 201920425173U CN 209781290 U CN209781290 U CN 209781290U
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Abstract
The utility model relates to an air conditioner accessory field especially relates to a through-flow fan blade and fan blade unit thereof. A fan blade unit comprises an end disc and a plurality of blades arranged on the end disc along the same circumferential line, wherein the lower end parts of the blades are fixedly connected to a first end surface of the end disc; the blades are obliquely arranged along the circumferential direction of the end disc in the anticlockwise or clockwise same direction, and an obtuse angle is formed between a pressure surface of each blade and the end disc at the bottom of each blade; the blade tip is offset by a displacement radially outward of the end disk compared to the blade base. The fan blade unit adopts the blades which are obliquely arranged, so that the noise is reduced to a certain extent; further, the radial outer side of the top of the blade deviates a section of displacement, and the air quantity is increased to a certain extent. A second object of the present invention is to provide a cross-flow fan blade, which has the above fan blade unit.
Description
Technical Field
The utility model relates to an air conditioner accessory field especially relates to a through-flow fan blade and fan blade unit thereof.
Background
In order to match the size of the indoor unit of the air conditioner in the length direction, the whole cross-flow fan blade is in a slender cylinder shape. The cross-flow fan blade is one of important accessories in an air conditioner and is formed by connecting and processing a plurality of middle sections, each middle section is formed by integrally injecting a circular middle disc and a plurality of blades, the rear end of each blade is connected with the front end of the circular middle disc into a whole, and a plurality of blade mounting grooves matched with the front ends of the blades in shape and number are formed in the rear end of the circular middle disc; the front end of the blade of the next middle section is inserted into the blade mounting groove of the previous middle section. The inclined angle of the blade on each circular center plate on the existing cross-flow fan blade is the same, the air pressure before and after the airflow of the cross-flow fan blade passes through the blade twice is high, and the air-conditioning air-out sound produced by the cross-flow fan blade is unnatural. In addition, the central angles of adjacent blades are the same, the same-frequency impact of the blades on the volute tongue is large, and the rotating noise of the fan blades is large.
If the authorization publication number is "CN 207777269U", the Chinese utility model discloses a cross-flow fan blade, the angle of blade angle of inclination in this cross-flow fan blade is between 2.5 ~ 8.5, reduces the air pressure difference before and after cross-flow fan blade air current passes the blade twice, makes the air current gentle undulant, and the air conditioner air-out sound that adopts this cross-flow fan blade is more natural comfortable. Therefore, the existing cross-flow fan blade is widely arranged by adopting non-equidistant blades or adopts an inclined cross-flow fan blade, so that the parts of airflow impacting the vortex tongue and the like are staggered in time, the impact energy of certain frequency in the original set can be effectively dispersed into a certain frequency band, a wind sound sheet is formed, and the noise is reduced to a certain extent. In detail, refer to the study on the influence of the oblique volute tongue on the inner flow of the cross-flow fan and the noise reduction mechanism, which is published in the engineering thermophysics journal, volume 29, and phase 12. However, the air volume of the cross-flow fan blade is generally increased by increasing the number of blades, decreasing the blade pitch or increasing the rotation speed, but the above schemes will undoubtedly cause the noise of the cross-flow fan blade.
Disclosure of Invention
in order to solve the above problems, a first object of the present invention is to provide a fan blade unit, which employs obliquely arranged blades, thereby reducing noise to a certain extent; further, the radial outer side of the top of the blade deviates a section of displacement, and the air quantity is increased to a certain extent. A second object of the present invention is to provide a cross-flow fan blade, which has the above fan blade unit.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
A fan blade unit comprises an end disc and a plurality of blades arranged on the end disc along the same circumferential line, wherein the lower end parts of the blades are fixedly connected to a first end surface of the end disc; the method is characterized in that: the blades are obliquely arranged along the circumferential direction of the end disc in the anticlockwise or clockwise same direction, and an obtuse angle is formed between a pressure surface of each blade and the end disc at the bottom of each blade; the blade tip is offset by a displacement radially outward of the end disk compared to the blade base.
Preferably, the radius of the outer end part of the bottom of the blade is R2, and the radius of the inner end part of the bottom of the blade is R3; the outer end of the blade top is located at a radius of R4, and the inner end of the blade top is located at a radius of R5; R2-R3-R4-R5-L, R5-R3-R4-R2-L1, the offset of the blade tip is L1, and L1-L (4% -8%). The technical scheme limits the ratio of the offset of the top of the blade to the difference between the inner and outer end radii, so that the offset of the top of the blade is limited in a better implementation range.
Preferably, the radius of the outer edge of the end disc is R1, R2 ═ (95% -98%) R1, and R3 ═ (70% -80%) R1.
Preferably, a central angle formed by the outer end part of the blade bottom, the inner end part of the blade bottom and the center of the end disc is alpha 1; a central angle formed by the outer end part of the blade top, the inner end part of the blade top and the center of the end disc is alpha 3; α 1- α 3-6 ° to 12 °.
Preferably, the angle α 2 of inclination of the vane with respect to the axial plane is 4 ° to 9 °. In the technical scheme, the blade with the inclination angle alpha 2 of 4-9 degrees can effectively reduce the air pressure difference before and after the airflow of the cross flow fan blade passes through the blade twice, so that the airflow is gently fluctuated, and the air outlet sound of the air conditioner adopting the cross flow fan blade is more natural and comfortable.
A cross-flow fan blade is characterized in that: the fan blade unit comprises the fan blade unit as described in any one of the above; two adjacent fan blade units are connected with each other, and the second end face of the end disc is provided with a slot for butt joint with the blades.
The utility model adopts the above technical scheme, this technical scheme relates to a fan blade unit to and have the through-flow fan blade of this fan blade unit. In the fan blade unit, the end disc is provided with the obliquely arranged blades, and as the oblique through-flow blades are recorded in the background technology, the time for the airflow to impact the vortex tongue and other parts is staggered, the impact energy of certain frequency in the original set can be effectively dispersed into a certain frequency band, so that a wind noise sheet is formed, and the noise is reduced to a certain extent. Furthermore, the technical scheme is that the top of the blade is offset at the radial outer side of the end disc by a section of displacement compared with the bottom of the blade, so that the radius of the top of the blade relative to the bottom of the blade is larger; under the condition that the rotation of the cross-flow fan blade is not changed, the larger the radius is, the larger the linear velocity is, and therefore the air volume can be increased to a certain extent.
Drawings
Fig. 1 is a schematic structural diagram of the fan blade unit of the present invention.
Fig. 2 is a plan view comparing the fan blade unit of the present invention with a conventional fan blade unit (wherein the dotted line represents the position of the top of the fan blade in the conventional fan blade unit).
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1:
The fan blade unit shown in fig. 1-2 comprises an end disc 1 and a plurality of blades 2 arranged on the end disc 1 along the same circumferential line, wherein the lower end parts of the blades 2 are fixedly connected to a first end surface of the end disc 1; the blades 2 are arranged along the circumferential direction of the end disc 1 in an anticlockwise or clockwise equidirectional inclined manner, and in a further preferable scheme, the inclined angle alpha 2 of the blades 2 relative to the axial plane is 4-9 degrees. Based on the inclined arrangement scheme adopted by the blades 2, an obtuse angle is formed between the pressure surface 21 of the blade 2 and the end disc 1 at the bottom of the blade 2, and the obtuse angle is 94-99 degrees. In the technical scheme, the blade 2 with the inclination angle alpha 2 of 4-9 degrees can effectively reduce the air pressure difference before and after the airflow of the cross flow fan blade passes through the blade 2 twice, so that the airflow is gently fluctuated, and the air outlet sound of the air conditioner adopting the cross flow fan blade is more natural and comfortable.
In a further preferred solution, the top of the blade 2 is offset by a displacement radially outside the end disc 1 compared to the bottom of the blade 2. The radius of the outer end part of the bottom of the blade 2 is R2, and the radius of the inner end part of the bottom of the blade 2 is R3; the outer end of the top of the blade 2 is located at a radius of R4, the inner end of the top of the blade 2 is located at a radius of R5, and the outer edge of the end disc 1 is located at a radius of R1. R2 (95% -98%) -R1, R3 (70% -80%) -R1, R2-R3-R4-R5-L, R5-R3-R4-R2-L1, the offset of the top of the blade 2 is L1, and L1 is (4% -8%) -L. The technical scheme limits the ratio of the offset of the top of the blade 2 to the difference of the radiuses of the inner and outer ends of the inner sheet, so that the offset of the top of the blade 2 is limited in a better implementation range.
In a further preferable scheme, a central angle formed by the outer end part of the bottom of the blade 2, the inner end part of the bottom of the blade 2 and the center of the end disc 1 is alpha 1; the central angle formed by the outer end part of the top of the blade 2, the inner end part of the top of the blade 2 and the center of the end disc 1 is alpha 3; α 1- α 3-6 ° to 12 °.
The technical scheme relates to a fan blade unit. In the fan blade unit, the end disc 1 is provided with the blades 2 which are obliquely arranged, and as the oblique through-flow blades 2 are recorded in the background technology, the time for the airflow to impact the vortex tongue and other parts is staggered, the impact energy of certain frequency in the original set can be effectively dispersed into a certain frequency band, so that a wind sound sheet is formed, and the noise is reduced to a certain extent. Further, the technical scheme is that the top of the blade 2 is offset at the radial outer side of the end disc 1 by a section of displacement compared with the bottom of the blade 2, so that the radius of the top of the blade 2 relative to the bottom of the blade 2 is larger; under the condition that the rotation of the cross-flow fan blade is not changed, the larger the radius is, the larger the linear velocity is, and therefore the air volume can be increased to a certain extent. Based on the technical scheme, the cross-flow fan blade with the diameter of 102mm and the length of 675mm is improved and compared for testing. In the fan blade unit, R1 is 51mm, R2 is 49mm, R3 is 39mm, L is 10mm, and L1 is 0.6 mm; α 2 ═ 6 °, α 1 ═ α 3 ═ 8 °. And (3) test results: the air quantity is increased by 10 to 20 percent; the noise is reduced by 0.5-1 dB to meet the expected requirement.
Example 2:
A cross-flow fan blade comprises a fan blade unit as described in any one of embodiment 1; two adjacent fan blade units are connected with each other, and the second end face of the end disc 1 is provided with a slot for butt joint with the blades 2.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.
Claims (6)
1. a fan blade unit comprises an end disc and a plurality of blades arranged on the end disc along the same circumferential line, wherein the lower end parts of the blades are fixedly connected to a first end surface of the end disc; the method is characterized in that: the blades are obliquely arranged along the circumferential direction of the end disc in the anticlockwise or clockwise same direction, and an obtuse angle is formed between a pressure surface of each blade and the end disc at the bottom of each blade; the blade tip is offset by a displacement radially outward of the end disk compared to the blade base.
2. The fan blade unit of claim 1, wherein: the radius of the outer end part of the bottom of the blade is R2, and the radius of the inner end part of the bottom of the blade is R3; the outer end of the blade top is located at a radius of R4, and the inner end of the blade top is located at a radius of R5; R2-R3-R4-R5-L, R5-R3-R4-R2-L1, the offset of the blade tip is L1, and L1-L (4% -8%).
3. A fan blade unit according to claim 2, wherein: the radius of the outer edge of the end disc is R1, R2 (95-98%) R1, and R3 (70-80%) R1.
4. The fan blade unit of claim 1, wherein: a central angle formed by the outer end part of the bottom of the blade, the inner end part of the bottom of the blade and the center of the end disc is alpha 1; a central angle formed by the outer end part of the blade top, the inner end part of the blade top and the center of the end disc is alpha 3; α 1- α 3-6 ° to 12 °.
5. The fan blade unit of claim 4, wherein: the angle of inclination α 2 of the blades with respect to the axial plane is 4 ° to 9 °.
6. A cross-flow fan blade is characterized in that: the fan blade unit comprises the fan blade unit as defined in any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920425173.6U CN209781290U (en) | 2019-03-29 | 2019-03-29 | Cross-flow fan blade and fan blade unit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920425173.6U CN209781290U (en) | 2019-03-29 | 2019-03-29 | Cross-flow fan blade and fan blade unit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209781290U true CN209781290U (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920425173.6U Active CN209781290U (en) | 2019-03-29 | 2019-03-29 | Cross-flow fan blade and fan blade unit thereof |
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| CN (1) | CN209781290U (en) |
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- 2019-03-29 CN CN201920425173.6U patent/CN209781290U/en active Active
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