阅读说明：本技术 高速离心风机三元叶轮的纹路型叶片 (Grain type blade of ternary impeller of high-speed centrifugal fan ) 是由 克里斯蒂安.比约恩.奥玛松 徐伟 于 2021-09-13 设计创作，主要内容包括：本发明公开了高速离心风机三元叶轮的纹路型叶片,相邻叶片之间具有叶轮流道,所述叶轮流道由三元叶轮运转时的前向叶片、后向叶片及轮盘围成,所述叶轮流道在前向叶片上的工作面为功能面一,所述叶轮流道在后向叶片上的工作面为功能面二,所述叶轮流道在轮盘上的工作面为功能面三,所述功能面一上具有沟纹一,功能面三上具有沟纹二,功能面二为光滑面,所述沟纹一从叶片的梢部呈“√”趋势延伸向根部,沟纹二与沟纹一在根部相接并延伸向轮盘的边缘。本发明具有沟纹二与沟纹一的三元叶轮的结构能在光滑叶片的基础上进一步降低三元叶轮工作时的噪音。(The invention discloses a grain type blade of a ternary impeller of a high-speed centrifugal fan, wherein an impeller flow channel is arranged between adjacent blades, the impeller flow channel is surrounded by a forward blade, a backward blade and a wheel disc when the ternary impeller runs, the working surface of the impeller flow channel on the forward blade is a first functional surface, the working surface of the impeller flow channel on the backward blade is a second functional surface, the working surface of the impeller flow channel on the wheel disc is a third functional surface, the first functional surface is provided with a first furrow, the third functional surface is provided with a second furrow, the second functional surface is a smooth surface, the first furrow extends to the root part from the tip part of the blade in a 'check mark' trend, and the second furrow is connected with the first furrow at the root part and extends to the edge of the wheel disc. The structure of the ternary impeller with the second grooves and the first grooves can further reduce the noise of the ternary impeller during working on the basis of smooth blades.)

1. The line type blade of high-speed centrifugal fan ternary impeller, the blade of ternary impeller has root (100) and tip (200), root (100) and the rim plate (300) of ternary impeller meet, the root (100) of the same blade is not coplanar with the outline line of tip (200), with the running direction of ternary impeller during operation as the standard, root (100) is arranged in front to tip (200), tip (200) is crooked to root (100) and is formed the blade, have impeller runner (400) between the adjacent blade, impeller runner (400) is enclosed by preceding blade, backward blade and rim plate (300) during ternary impeller operation, its characterized in that, the working face of impeller runner (400) on preceding blade is functional plane one (410), the working face of impeller runner (400) on the backward blade is functional plane two (420), the working face of impeller runner (400) on rim plate (300) is functional plane three (430), the first functional surface (410) is provided with a first groove (440), the third functional surface (430) is provided with a second groove (450), the second functional surface (420) is a smooth surface, the first groove (440) extends from the tip (200) of the blade to the root (100) in a V-shaped trend, and the second groove (450) is connected with the first groove (440) at the root (100) and extends to the edge of the wheel disc (300).

2. The textured blade of the ternary impeller of the high-speed centrifugal fan according to claim 1, wherein the first furrow (440) comprises a straight portion (441) and a curved portion (442), the straight portion (441) forms an angle α with a direction A of a contour line of the tip (200), the angle α is between 100 and 120 °, the curved portion (442) is tangent to the straight portion (441) at a junction, a projection of the curved portion (442) on the wheel disc (300) is an arc L, a center B of the arc L is on an auxiliary line M, the auxiliary line M passes through the junction of the straight portion (441) and the curved portion (442) and is perpendicular to the straight portion (441), and a radius of the arc L projected by the curved portion (442) is equal to a perpendicular distance from the junction of the straight portion (441) and the curved portion (442) to a central axis of the ternary impeller.

Technical Field

The invention belongs to the technical field of fan impellers, and particularly relates to a grain type blade of a ternary impeller of a high-speed centrifugal fan.

Background

The three-dimensional flow design technology is characterized in that a three-dimensional space inside an impeller is infinitely divided according to a three-dimensional flow theory, a complete and real mathematical model of fluid flow in the impeller is established through analysis of all working points in an impeller flow channel, and grid division and flow field calculation are carried out. The three-dimensional flow design method is used for optimizing factors such as the inlet and outlet placement angle of the blades, the number of the blades, the shape of each section of the twisted blades and the like, and the structure of the three-dimensional flow design method can adapt to the real flow state of fluid, so that the flow separation of the working surface of the blades is avoided, the flow loss is reduced, the speed distribution of all fluid particles in the pump body can be controlled, the optimal flow state in the pump body is obtained, and the fluid conveying efficiency is guaranteed to be optimal.

The impeller of the high-speed centrifugal fan can generate high-frequency noise at high rotating speed, and the environment is seriously polluted. In the prior art, different methods are adopted for reducing the working noise of the impeller, such as changing the structural characteristics of the impeller, designing the mounting structure of a pump body and the like. How to reduce the noise generated when the high-speed centrifugal fan works is also the direction of efforts of the skilled person.

Disclosure of Invention

The invention aims to provide a grain type blade of a ternary impeller of a high-speed centrifugal fan, aiming at further reducing noise on the basis of not changing the basic shape of the ternary impeller.

The invention solves the technical problems through the following technical means:

the line type blade of the three-element impeller of the high-speed centrifugal fan is characterized in that the blade of the three-element impeller is provided with a root part and a tip part, the root part is connected with a wheel disc of the three-element impeller, contour lines of the root part and the tip part of the same blade are not coplanar, the running direction of the three-element impeller during working is taken as the standard, the tip part is arranged in front of the root part, the tip part is bent towards the root part to form the blade, an impeller flow channel is arranged between adjacent blades and is surrounded by a forward blade, a backward blade and the wheel disc during the running of the three-element impeller, the working surface of the impeller flow channel on the forward blade is a first functional surface, the working surface of the impeller flow channel on the backward blade is a second functional surface, the working surface of the impeller flow channel on the wheel disc is a third functional surface, the first functional surface is provided with a first furrow, the third functional surface is provided with a second furrow, the second functional surface is a smooth surface, and the first furrow extends towards the root part from the tip part of the blade in a V-shaped trend, the second groove is connected with the first groove at the root and extends to the edge of the wheel disc.

Furthermore, the first furrow comprises a straight portion and a bent portion, an included angle between the straight portion and the tip portion in the direction A is alpha, alpha is 100-120 degrees, the bent portion is tangent to the straight portion at a joint, the projection of the bent portion on the wheel disc is an arc L, the circle center B of the arc L is on an auxiliary line M, the auxiliary line M passes through the joint of the straight portion and the bent portion and is perpendicular to the straight portion, and the radius of the arc L formed by the projection of the bent portion is equal to the perpendicular distance from the joint of the straight portion and the bent portion to the central axis of the ternary impeller.

The invention has the beneficial effects that: the structure of the ternary impeller with the second grooves and the first grooves can further reduce the noise of the ternary impeller in the working process on the basis of smooth blades, and after the second grooves and the first grooves are arranged, the second grooves and the first grooves have a better guiding effect on air entering an impeller flow channel, so that the air smoothness is improved, the air movement in the impeller flow channel is reduced, and the noise is further reduced. Furthermore, different arrangements and verifications of the grooves show that the grooves are not arranged on all surfaces of the impeller flow passage to facilitate noise reduction, and the grooves have obvious noise reduction effect when the grooves meet the characteristics recorded in the embodiment.

Drawings

FIG. 1 is a schematic perspective view of a ternary impeller processed in accordance with the present invention;

FIG. 2 is a schematic cross-sectional structural view of a ternary impeller processed in accordance with the present invention;

FIG. 3 is a schematic top view of a ternary impeller manufactured in accordance with the present invention;

FIG. 4 is a schematic cross-sectional view taken along line A-A in FIG. 3;

FIG. 5 is a schematic view of the rotation of the ternary impeller in an operating state;

FIG. 6 is a layout view of corrugations in the impeller flow channels;

FIG. 7 is a characteristic diagram of a first corrugation.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 to 4, the three-element impeller to be formed in this embodiment is a schematic structural diagram of the three-element impeller, the three-element impeller is a semi-open impeller, the three-element impeller is composed of a wheel disk and blades, the wheel disk and the blades are of an integrated structure, an impeller flow channel is provided between adjacent blades, the number of the blades in this embodiment is eight, and the structures of the blades are completely the same. The diameter of the air inlet blade of the impeller is 108mm, the diameter of the air outlet wheel disc is 200mm, the total thickness of the impeller is 65mm, the arc length of the curved surface of the blade is 50mm, and the radius of the curved surface of the blade is R50 mm.

In fig. 1 and 5, the blade of the three-element impeller has a root portion 100 and a tip portion 200, the root portion 100 is an air outlet of the impeller, the root portion 100 is connected with the wheel disc 300 of the three-element impeller, the tip portion 200 is an air inlet of the impeller, contour lines of the root portion 100 and the tip portion 200 extend to intersect with an axis of the three-element impeller, orthographic projections of the contour lines of the root portion 100 and the tip portion 200 on the face of the wheel disc 300 have an included angle, the rotation direction of the three-element impeller during operation is taken as a reference (as shown by an arrow in fig. 5), the tip portion 200 is arranged in front of the root portion 100, the tip portion 200 is bent towards the root portion 100 to form the blade, and an impeller flow passage 400 is formed between adjacent blades.

The key point of this embodiment lies in the design of the surface lines of the blades and the disk 300 forming the impeller flow passage 400, which is as follows:

as shown in fig. 6, each impeller flow passage 400 is defined by a forward blade (forward blade refers to the front side of the rotation direction when the three-element impeller operates), a backward blade when the three-element impeller operates, and a face of the wheel disc 300 between the forward blade and the backward blade, the working surface of the impeller flow passage 400 on the forward blade is a first functional surface 410, the working surface of the impeller flow passage 400 on the backward blade is a second functional surface 420, and the working surface of the impeller flow passage 400 on the wheel disc 300 is a third functional surface 430, wherein the first functional surface 410 has a first groove 440, the third functional surface 430 has a second groove 450, the first groove 440 extends from the tip 200 to the root 100 of the blade, and the second groove 450 and the first groove 440 are connected at the root 100 and extend to the edge of the wheel disc 300.

The second functional surface 420 is not grooved and needs to maintain its smoothness.

As shown in fig. 7, the first corrugation 440 includes a straight portion 441 and a curved portion 442, the straight portion 441 forms an angle α with a direction a of a contour line of the tip 200, α is 100 ° to 120 °, the curved portion 442 is tangent to the straight portion 441 at a junction, the curved portion 442 is curved from the junction with the straight portion 441 toward a central axis of the three-dimensional impeller until extending to a root portion 100, a projection of the curved portion 442 on the wheel disc 300 is a circular arc L, a center B of the circular arc L is on an auxiliary line M passing through the junction of the straight portion 441 and the curved portion 442 and perpendicular to the straight portion 441, and a radius of the circular arc L projected by the curved portion 442 is equal to a perpendicular distance from the junction of the straight portion 441 and the curved portion 442 to the central axis of the three-dimensional impeller.

Examples 2 to 7

Based on the structure of the ternary impeller described in example 1, the following performance tests were performed, including a test impeller, a first control impeller, and a second control impeller.

Specification limits of the test impeller, the comparison impeller I and the comparison impeller II: the number of the blades is eight, the diameter of an air inlet blade of the impeller is 108mm, the diameter of an air outlet wheel disc is 200mm, the total thickness of the impeller is 65mm, the arc length of a curved surface of the blade is 50mm, and the radius of the curved surface of the blade is R50 mm.

Testing the impeller: has two grooves 450 and one groove 440, alpha is 110 deg.

Comparing the impeller I: the second groove 450 and the first groove 440 are not provided, that is, the surrounding surface of the impeller flow passage 400 is smooth.

Comparing the impeller II: not only has two grooves 450 and one groove 440, but also has three grooves (not shown) on the second functional surface 420, the three grooves are the same as the first groove 440. Since the second functional surface 420 and the first functional surface 410 are two surfaces of the same blade and have almost the same shape, the third groove is set to be the same as the first groove 440.

The rotation speed of the impeller is controlled to be the same (the positive deviation and the negative deviation do not exceed 5%) in the test process, and the test is carried out in the same sound insulation environment.

Table 1 shows the test parameters and performance data of 2-7.

Examples 8 to 13

Based on the structure of the ternary impeller described in example 1, a performance test was performed on the ternary impeller using only the test impeller, and the test impellers of different examples were different in α.

Specification definition of the test impeller: the number of the blades is eight, the diameter of an air inlet blade of the impeller is 108mm, the diameter of an air outlet wheel disc is 200mm, the total thickness of the impeller is 65mm, the arc length of a curved surface of the blade is 50mm, and the radius of the curved surface of the blade is R50 mm.

The rotation speed of the impeller is controlled to be the same (the positive deviation and the negative deviation do not exceed 5%) in the test process, and the test is carried out in the same sound insulation environment.

Table 2 shows the test parameters and performance data of 8-13.

According to the results in tables 1 and 2, the structure of the ternary impeller with the second groove 450 and the first groove 440 can further reduce the noise of the ternary impeller in operation on the basis of smooth blades, and through simulation and experimental verification, after the second groove 450 and the first groove 440 are arranged, the second groove 450 and the first groove 440 have a better guiding effect on air entering the impeller flow channel 400, so that the air smoothness is improved, the air channeling in the impeller flow channel 400 is reduced, and further the noise is reduced. Further, different arrangements and verifications of the grooves show that the grooves are not arranged on all surfaces of the impeller flow passage 400, which is beneficial to noise reduction, and the grooves have obvious noise reduction effect when the grooves meet the characteristics recorded in the embodiments.

It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.