Blade and impeller

Abstract

The utility model discloses a blade and an impeller. The molded lines of an inner layer and an outer layer of an existing blade are the same and are not changed, so that the speed of fluid passing through the inner layer and the outer layer of the blade is close, the pressure difference between the inner layer and the outer layer of the blade is small, and the working efficiency of an impeller is low. The curvature of the inner-layer molded line of the blade is larger than the curvature of the outer-layer molded line of the molded line of the blade; according to the impeller using the blades, the impeller cover and the impeller disc are oppositely arranged at an interval, the multiple blades which are arranged at equal intervals in the circumferential direction are arranged between the impeller cover and the impeller disc, and the two ends of each blade are fixed to the impeller cover and the impeller disc. The curvature of the inner-layer molded line is larger than that of the outer-layer molded line, so that when fluid flows through the blade, the fluid in the inner layer of the blade flows slowly and is large in pressure, the fluid in the outer layer of the blade flows quickly and is small in pressure, and a large pressure difference is generated on the surface of the blade, so that the impeller is effectively pushed to rotate, and the working efficiency of the impeller is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of impellers, and in particular relates to a blade and an impeller. Background Art

[0002] The blades are the key components of the impeller, and the quality of the blades directly affects the efficiency of the impeller. At present, the blades of the impeller are mostly airfoil-shaped blades. Compared with the blades formed by stamping aluminum plates, they have made great progress in gas flow and reduced the probability of turbulence in the flow domain composed of the two blades, the wheel cover and the wheel disc in the impeller. However, due to process reasons, the inner and outer layer profiles of the current airfoil-shaped blades are the same and have not changed. This results in the fluid passing through the inner and outer layers of the blades. The speed is close, the pressure difference between the inner and outer layers of the blade is small, and then the impeller efficiency is low. Summary of the invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a blade and an impeller.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a blade, the transverse section of which is formed by an inner layer profile, an outer layer profile and two arc segments connecting the two ends of the inner layer profile and the outer layer profile, and the longitudinal section of which is formed by two blade bone lines and two straight line segments connecting the two ends of the two blade bone lines.

[0006] The fitting formula of the inner layer profile is:

[0007] y1=0.0017x1 2 +0.3155x1-52.069

[0008] Among them, -280.13 <x1≤-66.87;

[0009] The fitting formula of the outer layer profile is:

[0010] y2=0.0015x2 2 +0.2559x2-48.395

[0011] Among them, -278.11 <x2≤-63.97;

[0012] The fitting formula of the blade bone line is:

[0013] z=-10 -7 y 4 +6×10 -5 y 3 -0.0079y 2 +0.4316y-59.656

[0014] Among them, -55.05 <y≤-23.41。

[0015] An impeller using a blade of the utility model also comprises a wheel cover and a wheel disc, wherein the wheel cover and the wheel disc are arranged opposite to each other and at a distance, a plurality of blades are arranged equidistantly along the circumferential direction between the wheel cover and the wheel disc, and both ends of each blade are fixed to the wheel cover and the wheel disc.

[0016] The utility model has the following beneficial effects:

[0017] 1. The curvature of the inner layer profile of the blade of the utility model is greater than that of the outer layer profile, so that when the fluid flows through, the inner layer fluid of the blade flows slowly and the pressure is high due to the large curvature of the inner layer profile, while the outer layer fluid flows quickly and the pressure is low due to the small curvature of the outer layer profile. The two fluids with different flow rates produce a large pressure difference on the blade surface, which effectively drives the impeller to rotate, thereby improving the working efficiency of the impeller.

[0018] 2. The inner and outer layer profiles of the blades of the utility model are designed from thin at the front end to thick in the middle and then return to thin at the rear end, so that the fluid can slowly and evenly expand the pressure when flowing through, converting the ineffective dynamic pressure of the fluid into effective static pressure, further improving the working efficiency of the impeller, and avoiding the occurrence of pressure loss due to sudden changes in the cross-section when the fluid flows through.

[0019] 3. The blades of the utility model are scanned along the blade bone line in the longitudinal direction to form variable cross-section blades, which means that the shape of the blade changes gradually from the bottom to the top. This design allows the blade to maintain optimal aerodynamic performance at different speeds, thereby achieving high efficiency within the entire working range of the impeller. Combined with the design of the inner and outer layer profiles of the blade, it is ensured that each section of the blade is designed to be very smooth without sudden bends or angles. This smoothness reduces the generation of turbulence, which is one of the main factors leading to energy loss. Moreover, the design of the blade bone line with a large curvature at the bottom and a small curvature at the top makes the speed of the fluid at the bottom of the blade lower than the speed of sound, which helps to reduce shock wave losses, and the speed of the fluid at the top of the blade is close to the speed of sound, which helps to maintain efficiency during high-speed operation. Through the precise curve design of the blade bone line, the vibration of the blade can be minimized, which not only reduces noise but also extends the service life of the impeller; in addition, the high-order smooth blade bone line helps to reduce the need for blade maintenance because they reduce wear and erosion on the blade surface and improve the overall reliability of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a blade of the utility model;

[0021] Figure 2 This is a transverse cross-sectional appearance diagram of a blade of the utility model;

[0022] Figure 3 It is a schematic diagram of the inner layer profile of the utility model;

[0023] Figure 4 It is a schematic diagram of the outer layer profile of the utility model;

[0024] Figure 5 This is a schematic diagram of the blade skeleton line of a blade of the utility model;

[0025] Figure 6 The utility model is a structural schematic diagram of an impeller. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings.

[0027] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the utility model is a blade, the transverse section is formed by an inner layer profile 1, an outer layer profile 2 and two arc segments connecting the two ends of the inner layer profile 1 and the outer layer profile 2, and the longitudinal section is formed by two blade bone lines and two straight line segments connecting the two ends of the two blade bone lines; the transverse section is stretched along the blade bone line to form the blade of the utility model.

[0028] In the three-axis coordinate system xyz, the fitting formula of the inner layer profile 1 is:

[0029] y1=0.0017x1 2 +0.3155x1-52.069

[0030] Among them, -280.13 <x1≤-66.87;

[0031] The fitting formula of outer layer profile 2 is:

[0032] y2=0.0015x2 2 +0.2559x2-48.395

[0033] Among them, -278.11 <x2≤-63.97;

[0034] like Figure 5 As shown in the figure, the fitting formula of the blade bone line is:

[0035] z=-10 -7 y 4 +6×10 -5 y 3 -0.0079y 2 +0.4316y-59.656

[0036] Among them, -55.05 <y≤-23.41。

[0037] like Figure 6 As shown, an impeller using a blade of the utility model also includes a wheel cover 3 and a wheel disc 4. The wheel cover 3 and the wheel disc 4 are opposite to each other and are arranged at a distance. A plurality of blades are arranged equidistantly along the circumferential direction between the wheel cover 3 and the wheel disc 4, and both ends of each blade are fixed to the wheel cover 3 and the wheel disc 4.

Claims

1. A blade, characterized in that: The transverse section is formed by the inner layer profile, the outer layer profile and two arc segments connecting the two ends of the inner layer profile and the outer layer profile, and the longitudinal section is formed by the two blade bone lines and two straight line segments connecting the two ends of the two blade bone lines; The fitting formula of the inner layer profile is: y1=0.0017x1 2 +0.3155x1-52.069 Among them, -280.13 <x1≤-66.87; The fitting formula of the outer layer profile is: y2=0.0015x2 2 +0.2559x2-48.395 Among them, -278.11 <x2≤-63.97; The fitting formula of the blade bone line is: z=-10 -7 and 4 +6×10 -5 and 3 -0.0079y 2 +0.4316y-59.656 Among them, -55.05 <y≤-23.41。 2. An impeller using a blade according to claim 1, characterized in that: It also includes a wheel cover and a wheel disc, which are opposite to each other and spaced apart. A plurality of blades are arranged equidistantly along the circumferential direction between the wheel cover and the wheel disc, and both ends of each blade are fixed to the wheel cover and the wheel disc.

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