阅读说明：本技术 一种反曲率大出口角叶轮 (Impeller with reverse curvature and large outlet angle ) 是由 郭俊宝 陈飞 王东军 高志雄 张建武 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种反曲率大出口角叶轮；包括叶轮本体和叶片,所述叶轮本体的中心设有安装部,安装部的中心设有安装孔；其特征在于：所述叶轮本体设有三个结构相同的主叶片,次叶轮小于主叶轮的长度；其中三个主叶片靠近叶轮本体的中心位置,且呈均匀分布；上述主叶轮自叶轮本体的中心向主叶轮的端部分为正常曲率段和反曲率段,反曲率段的末端形成的出口角大于或等于90度。本发明采用上述技术方案在不改变尺寸前提下,达到提高扬程的目。(The invention discloses an impeller with reverse curvature and large outlet angle; the impeller comprises an impeller body and blades, wherein a mounting part is arranged at the center of the impeller body, and a mounting hole is formed in the center of the mounting part; the method is characterized in that: the impeller body is provided with three main blades with the same structure, and the length of the secondary impeller is smaller than that of the main impeller; the three main blades are close to the central position of the impeller body and are uniformly distributed; the main impeller is divided into a normal curvature section and a reverse curvature section from the center of the impeller body to the end part of the main impeller, and an outlet angle formed by the tail end of the reverse curvature section is larger than or equal to 90 degrees. By adopting the technical scheme, the invention achieves the aim of improving the lift on the premise of not changing the size.)

1. An impeller with reverse curvature and large outlet angle; the impeller comprises an impeller body and blades, wherein a mounting part is arranged at the center of the impeller body, and a mounting hole is formed in the center of the mounting part; the method is characterized in that: the impeller body is provided with three main blades with the same structure; the three main blades are close to the central position of the impeller body and are uniformly distributed; the main impeller is divided into a normal curvature section and a reverse curvature section from the center of the impeller body to the end part of the main impeller; wherein the length of the reverse curvature section accounts for 20% -25% of the total length of the main blade; the end of the reverse curvature section forms an exit angle greater than or equal to 90 degrees.

2. The high exit angle impeller of reverse curvature of claim 1, wherein: the installation department is the toper installation department, and the center of toper installation department is equipped with the toper mounting hole.

3. The high exit angle impeller of reverse curvature of claim 2, wherein: be close to the toper installation department the equipartition is equipped with three balancing hole on the impeller body.

4. The high exit angle impeller of reverse curvature of claim 1, wherein: the six secondary impellers are divided into three groups, each group comprises two secondary impellers, and the two secondary impellers are correspondingly distributed on the outer side of the main impeller.

Technical Field

The invention belongs to the technical field of diesel engine cooling water pumps, and particularly relates to an impeller with reverse curvature and a large outlet angle.

Background

Many medium and large diesel engines all adopt a water cooling structure and are provided with special cooling water pumps, but the general structure is compact due to the limitation of the driving mode and the space size of the cooling water pumps of the diesel engines. Along with the development of the technology, the diesel engine has more and more extensive applications and more complex functions, and more equipment needs to be equipped, so that higher requirements are provided for a cooling system of the diesel engine, but the overall structure of the diesel engine is mature and generally has no great change, but the pressure of a matched cooling water pump cannot meet the requirements due to the change of matched equipment, and the lift of the diesel engine needs to be improved. It is therefore proposed that the head needs to be increased without changing the size, weight, mounting manner, etc. The traditional design method needs to increase the outer diameter of the impeller, and because the size limitation of a pump body is impossible, a brand new impeller needs to be designed to achieve the purpose of improving the lift on the premise of not changing the size.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the impeller with the large reverse curvature outlet angle, which achieves the purpose of improving the lift under the condition of basically unchanged efficiency without changing the size.

The invention is realized in such a way that the impeller with reverse curvature and large outlet angle; the impeller comprises an impeller body and blades, wherein a mounting part is arranged at the center of the impeller body, and a mounting hole is formed in the center of the mounting part; the method is characterized in that: the impeller body is provided with three main blades with the same structure, and the length of the secondary impeller is smaller than that of the main impeller; the three main blades are close to the central position of the impeller body and are uniformly distributed; the main impeller is divided into a normal curvature section and a reverse curvature section from the center of the impeller body to the end part of the main impeller, and an outlet angle formed by the tail end of the reverse curvature section is larger than or equal to 90 degrees.

Preferably, in the above technical solution, the length of the reverse curvature section accounts for 20% -25% of the total length of the main blade;

preferably, the technical scheme comprises six secondary blades with the same structure, and the secondary impeller is smaller than the main impeller in length; the six secondary impellers are divided into three groups, each group comprises two secondary impellers, and the two secondary impellers are correspondingly distributed on the outer side of the main impeller.

Preferably in the above technical scheme, the mounting part is a tapered mounting part, and a tapered mounting hole is formed in the center of the tapered mounting part.

Preferably among the above-mentioned technical scheme, be close to the toper installation department the equipartition is equipped with three balancing hole on the impeller body.

The invention has the advantages and technical effects that: the invention adopts the technical scheme that the main impeller is divided into a normal curvature section and a reverse curvature section from the center of the impeller body to the end part of the main impeller, and an outlet angle formed by the tail end of the reverse curvature section is larger than or equal to 90 degrees. The impeller with the reverse curvature and the large outlet angle has the effect of greatly increasing the lift under the condition that the structural size is not changed, and has very high practicability in the aspects of upgrading and transformation, serial design and the like of a plurality of centrifugal pumps.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a cross-sectional view of the impeller;

FIG. 3 is a schematic view of a normal curvature and comparative structure of the present invention

FIG. 4 is a schematic structural view of example 2 of the present invention; .

In the figure, 1, impeller book; 1-1, an installation part; 1-2, mounting holes; 1-3, normal curvature segment; 1-4, a reverse curvature section; 1-5, balance holes; 2-1, main blades; 2-2, secondary blade.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiment 1, please refer to fig. 1 to 3, a reverse curvature impeller with large outlet angle; the impeller comprises an impeller body 1 and blades, wherein the center of the impeller body is provided with a mounting part 1-1, and the center of the mounting part is provided with a mounting hole 1-2; the impeller body is provided with three main blades 2-1 with the same structure; the three main blades are close to the central position of the impeller body and are uniformly distributed; the main impeller is divided into a normal curvature section 1-3 and a reverse curvature section 1-4 from the center of the impeller body to the end part of the main impeller, and an exit angle formed by the tail end of the reverse curvature section is larger than or equal to 90 degrees. As shown in fig. 3, the normal curvature is a streamline structure, and the curvature of the blade in the length direction is not abrupt. Whereas the reverse-curvature vanes are diametrically opposed.

Preferably, in the above technical solution, the length of the reverse curvature section accounts for 20% -25% of the total length of the main blade; tests show that the increase of the lift is not obvious when the reverse curvature section is too small, and the lift is in a descending trend when the reverse curvature section is too large.

Preferably in the above technical scheme, the mounting part is a tapered mounting part, and a tapered mounting hole is formed in the center of the tapered mounting part. The conical mounting hole is in interference conical surface connection fit with the transmission shaft.

Preferably among the above-mentioned technical scheme, be close to the toper installation department the equipartition is equipped with three balanced hole 1-5 on the impeller body, dismantles the usefulness as the impeller promptly, uses as balanced impeller axial force again.

Taking the design of a certain type of pump as an example to illustrate the effect of the present invention, the following table is referred to with reference to the design parameters of the main blade in fig. 1;

after the blades are designed by adopting the reverse curvature, the test results are as follows:

in embodiment 2, referring to fig. 4, in order to further increase the lift, the optimization is further performed on the basis of embodiment 1, that is, on the basis of embodiment 1, the impeller with the large outlet angle and the reverse curvature further includes six secondary blades 2-2 with the same structure, the six secondary blades are divided into three groups, each group includes two secondary blades, the two secondary blades are correspondingly distributed on the outer side of the main blade, and the curvature of the secondary blades is consistent with that of the reverse curvature of the main blade

The following table is referred to in connection with fig. 3 with respect to the design parameters of the main blade;

the test data show that the reverse-curvature impeller can obviously improve the lift, and the lift can be further improved after the secondary impeller is added.

In conclusion, the impeller with the reverse curvature and the large outlet angle has the effect of greatly increasing the lift under the condition of unchanging the structural size, and has great practicability in the aspects of upgrading and modifying a plurality of centrifugal pumps, serial design and the like.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.