Wide and efficient centrifugal pump impeller blade structure

Abstract

The utility model relates to a wide and efficient centrifugal pump impeller blade structure which comprises a blade inlet edge, a blade outlet edge and a blade body, the blade inlet edge and the blade outlet edge are located at the two ends of the blade body, and the blade inlet edge, the blade outlet edge and the blade body are integrally formed. An arc-shaped transition edge is arranged on the inlet edge of the blade, the thickness of the front section of the outlet edge of the blade is gradually increased and then gradually decreased, and the thickness of a middle section between the gradually-increased section and the gradually-decreased section is larger than the thickness of the gradually-increased section and the thickness of the gradually-decreased section. The efficient range of the impeller is enlarged, the efficient range of the pump is enlarged, the number of efficient working condition points is increased, the electricity utilization cost of the whole pump is reduced, and economic benefits are improved.

Description

Technical Field

[0001] The utility model relates to a blade structure of a centrifugal pump impeller, in particular to a wide-high-efficiency blade structure of a centrifugal pump impeller that can improve the high-efficiency range of the impeller. Background Art

[0002] Centrifugal pumps are widely used in modern industrial production and daily life, and the electricity consumption is quite considerable. How to improve the wide-high-efficiency range of centrifugal pumps, make the efficiency of centrifugal pumps higher under as many working conditions as possible, thereby reducing the electricity consumption of the pumps, has practical significance for energy conservation and reducing the electricity cost of customers, improving the market competitiveness of pump products, and also contributing to the early realization of "dual carbon".

[0003] Generally, the shape structure of the blades of traditional centrifugal pumps is as Figure 1 shown. The thickness of the inlet edge of the blade is the smallest, and the thickness gradually increases from the inlet edge. After increasing to a certain thickness, the thickness remains unchanged until the outlet edge. The advantage is that the structure is simple and easy to cast; however, under special working conditions, without changing the structure of the pump body or impeller, it is easy to deviate from the working conditions, resulting in a reduction in the wide-high-efficiency range. In actual use, the pump efficiency is relatively low under different working conditions, the electricity consumption increases, and the economy is poor. Content of the Utility Model

[0004] Aiming at the above problems, the main purpose of the utility model is to provide a wide-high-efficiency blade structure of a centrifugal pump impeller that can improve the high-efficiency range of the impeller.

[0005] The utility model solves the above technical problems through the following scheme: a wide-high-efficiency blade structure of a centrifugal pump impeller, the wide-high-efficiency blade structure of the centrifugal pump impeller includes: the inlet edge of the blade, the outlet edge of the blade, and the blade body. The inlet edge and the outlet edge of the blade are located at both ends of the blade body. The inlet edge, the outlet edge, and the blade body of the blade are integrally formed. An arc-shaped transition edge is provided at the inlet edge of the blade. The thickness of the front section of the outlet edge of the blade first gradually increases and then gradually decreases. The thickness of the middle section between the gradually increasing section and the gradually decreasing section is greater than that of the gradually increasing section and the gradually decreasing section.

[0006] In a specific embodiment of the utility model, the length of the gradually increasing section is 6.6%-10% of the total length of the blade.

[0007] In a specific embodiment of the utility model, the maximum thickness of the gradually increasing section is 2.5-3 times the thickness of the inlet edge.

[0008] In a specific embodiment of the utility model, the length of the gradually decreasing section is 3.3%-5% of the total length of the blade.

[0009] In a specific embodiment of the present utility model, the maximum thickness of the gradually decreasing section is 2.5 to 3 times the thickness of the inlet edge.

[0010] In a specific embodiment of the present utility model, the thickness of the outlet edge is 1.5 to 2.5 times the thickness of the inlet edge.

[0011] In a specific embodiment of the present utility model, the length of the middle section between the gradually increasing section and the gradually decreasing section is 3.3% - 5% of the total length of the blade.

[0012] In a specific embodiment of the present utility model, the thickness of the middle section between the gradually increasing section and the gradually decreasing section is 2 to 2.5 times the thickness of the inlet edge.

[0013] The positive and progressive effects of the present utility model are as follows: Compared with common similar technologies, the wide and efficient centrifugal pump impeller blade structure provided by the present utility model improves the efficient range of the impeller, enlarges the efficient range of the pump, increases the number of relatively efficient operating points, reduces the electricity consumption cost of the whole pump, and improves economic benefits. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a currently common blade.

[0015] Figure 2 It is a schematic structural diagram of the present utility model.

[0016] Figure 3 For Figure 2 Partial enlarged view of

[0017] Figure 4 It is an effect diagram of the present utility model.

[0018] Figure 5 For Figure 4 Partial enlarged view of Detailed Embodiment

[0019] The following provides a preferred embodiment of the present utility model in conjunction with the drawings to detail the technical solution of the present utility model.

[0020] Figure 2 It is a schematic structural diagram of the present utility model, Figure 3 For Figure 2 Partial enlarged view of Figure 4 It is an effect diagram of the present utility model, Figure 5 For Figure 4 Partial enlarged view of Figure 2 - 5Shown as follows: A blade structure of an impeller of a wide and efficient centrifugal pump proposed by the present utility model. The blade structure of the impeller of the wide and efficient centrifugal pump includes: the inlet edge of the blade, the outlet edge of the blade, and the blade body. The inlet edge and the outlet edge of the blade are located at both ends of the blade body. The inlet edge, the outlet edge, and the blade body of the blade are integrally formed. An arc-shaped transition edge is provided at the inlet edge of the blade. The thickness of the front section of the outlet edge of the blade first gradually increases and then gradually decreases. The thickness of the middle section between the gradually increasing section and the gradually decreasing section is greater than that of the gradually increasing section and the gradually decreasing section.

[0021] The length of the gradually increasing section (at 1) is 6.6%-10% of the total length of the blade. The maximum thickness of the gradually increasing section (at 1) is 2.5-3 times the thickness of the inlet edge. The length of the gradually decreasing section (at 2) is 3.3%-5% of the total length of the blade. The maximum thickness of the gradually decreasing section (at 2) is 2.5-3 times the thickness of the inlet edge. The thickness of the outlet edge is 1.5-2.5 times the thickness of the inlet edge. The length of the middle section between the gradually increasing section (at 1) and the gradually decreasing section (at 2) is 3.3%-5% of the total length of the blade. The thickness of the middle section between the gradually increasing section (at 1) and the gradually decreasing section (at 2) is 2-2.5 times the thickness of the inlet edge. In the specific implementation process, the above parameters can vary according to specific circumstances.

[0022] Figure 4 and 5 In it, A2 is the outlet area between the blades. According to the Anderson area ratio principle, the area ratio Y = the area of the pump body throat / the total outlet area between the impeller blades. The larger Y is, the easier it is for the pump to operate at a smaller flow rate. The smaller Y is, the easier it is to operate at a larger flow rate. And generally, the value of the numerator remains unchanged. Therefore, the present utility model mainly increases the value of the denominator to make this ratio Y decrease, thereby slowing down the decline in efficiency at a large flow rate and improving the efficiency at the large flow rate point.

[0023] Estimation formula: The total outlet area of the impeller = 0.95D2×π×b2×sinβ2. In the present utility model, the reduction of the thickness of the outlet edge is equivalent to increasing the angle β2, thereby increasing the total outlet area of the impeller and making the ratio Y decrease, which is beneficial to improving the efficiency at the large flow rate point.

[0024] The total outlet area of the impeller = 0.95D2×π×b2×sinβ2. (The formula is from "Modern Pump Handbook")

[0025] D2 represents (the outer diameter of the impeller), b2 represents (the outlet width of the impeller), and β2 represents (the installation angle of the impeller blade outlet).

[0026] Before the first position in front of the blade outlet edge of the present utility model, there is little difference from the traditional blade shape. However, the thickness of the blade gradually increases at the first position in a section in front of the blade outlet edge and then gradually decreases at the second position. This results in an increase in the effective outlet area between two adjacent blades of the impeller, reducing the ratio between the throat area of the pump body and this area. This is beneficial to improving the efficiency at the large flow rate point of the pump, expanding the flow rate range of high efficiency, and increasing the range of high-efficiency operating points.

[0027] In most cases, within the range of small flow rate to large flow rate, the efficiency gradually increases from small to large. The efficiency is the highest near the design point, and then gradually decreases at large flow rates behind the design point.

[0028] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A wide and efficient impeller blade structure of a centrifugal pump, characterized in that: The wide and efficient centrifugal pump impeller blade structure includes: the inlet edge of the blade, the outlet edge of the blade, and the blade body. The inlet edge and the outlet edge of the blade are located at both ends of the blade body. The inlet edge, the outlet edge, and the blade body are integrally formed. An arc-shaped transition edge is provided at the inlet edge of the blade. For the outlet edge of the blade, the thickness first gradually increases in the first section before the outlet edge, and then gradually decreases. The thickness of the middle section between the gradually increasing section and the gradually decreasing section is greater than that of the gradually increasing section and the gradually decreasing section.

2. The wide and efficient centrifugal pump impeller blade structure according to claim 1, characterized in that: The length of the gradually increasing section is 6.6%-10% of the total blade length.

3. The wide and efficient centrifugal pump impeller blade structure according to claim 1, characterized in that: The maximum thickness of the gradually increasing section is 2.5-3 times the thickness of the inlet edge.

4. The wide and efficient centrifugal pump impeller blade structure according to claim 1, wherein: The length of the gradually decreasing section is 3.3%-5% of the total blade length.

5. The wide and efficient centrifugal pump impeller blade structure according to claim 1, characterized in that: The maximum thickness of the gradually decreasing section is 2.5-3 times the thickness of the inlet edge.

6. The wide and efficient centrifugal pump impeller blade structure according to claim 1, characterized in that: The thickness of the outlet edge is 1.5-2.5 times the thickness of the inlet edge.

7. The wide and efficient centrifugal pump impeller blade structure according to claim 1, wherein: The length of the middle section between the gradually increasing section and the gradually decreasing section is 3.3%-5% of the total blade length.

8. The wide and efficient centrifugal pump impeller blade structure according to claim 1, characterized in that: The thickness of the middle section between the gradually increasing section and the gradually decreasing section is 2-2.5 times the thickness of the inlet edge.

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