Cavitation-resistant vertical shaft tubular pump impeller

Abstract

The utility model discloses an anti-cavitation shaft tubular pump impeller, and belongs to the field of impellers. When the impeller is used, water flow enters along the axial direction of the impeller and flows out along the axial direction. The plurality of blades are arranged on the hub; each blade is provided with a skirt edge part, the skirt edge parts are arranged on the end faces of the sides, away from the hub, of the blades, and the skirt edge parts face the side faces where water flow enters. The length of the skirt edge part is larger than the distance between the two ends of the skirt edge part and the blade end point. The anti-cavitation shaft tubular pump impeller has the beneficial effect that the anti-cavitation shaft tubular pump impeller is provided.

Description

Technical Field

[0001] The present application relates to the field of impellers, and more particularly, to a shaft tubular pump impeller with cavitation resistance. Background Art

[0002] When a water pump is working, cavitation often occurs. Essentially, this cavitation phenomenon is a kind of hydrodynamic cavitation effect related to vortices. It refers to the situation where when the pressure of a fluid during movement drops below its critical pressure (generally the saturated vapor pressure), cavitation bubbles are generated in local areas of the fluid. After these cavitation bubbles grow to a certain extent and then collapse and disappear under the influence of external factors, a water hammer effect is triggered locally, and the stress can reach thousands of atmospheric pressures. Obviously, this effect is destructive. Macroscopically, the cavitation phenomenon causes erosion damage to the surface of the flow channel (a kind of continuous high-frequency impact damage), triggers vibration, and generates noise; in severe cases, there is a broken flow, resulting in blockage of the flow channel and a decline in the performance of the water pump. When the existing water pump impellers guide the flow of the fluid, the impact force of the fluid on the impeller is relatively large, and the cavitation phenomenon is relatively obvious, thus affecting the service life of the impeller. Summary of the Utility Model

[0003] This part of the content of the present application is used to briefly introduce the concepts, which will be described in detail in the following detailed implementation part. This part of the content of the present application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0004] In order to solve the technical problems mentioned in the above background art part, some embodiments of the present application provide a shaft tubular pump impeller with cavitation resistance. When in use, the water flow enters axially along the impeller and exits axially, and includes:

[0005] A hub;

[0006] Blades, several of which are arranged on the hub;

[0007] Each blade is provided with a skirt portion, the skirt portion is arranged on the end face of the blade away from the hub, and the skirt portion faces the side where the water flow enters; the length of the skirt portion is greater than the distance from both ends of the skirt portion to the end point of the blade.

[0008] Through the action of the skirt portion, the present application improves the flow state of the small-gap cavitation and can improve the cavitation effect. Thus, it is applied to the shaft tubular water pump. At the same time, through CFD simulation tests and actual measurements, the application of this impeller structure on the shaft tubular pump has an obvious improvement effect on the cavitation of the outer edge of the impeller, and at the same time, it can extend the overhaul time of the impeller and increase the service life of the impeller.

[0009] Further, the length of the skirt part is a, and the distance from both ends of the skirt part to the blade end point is b, where b is less than

[0010] Further, the skirt part is vertically arranged with respect to the blade.

[0011] Further, both ends of the skirt part are configured to be an inclined surface.

[0012] Further, the thickness of the skirt part is greater than that of the blade, and the thickness ratio range of the skirt part to the blade is 1.05 - 1.2.

[0013] Further, the end face of the blade close to the hub is an inclined surface structure.

[0014] Further, the inclination angle of the end face of the blade close to the hub is 15° - 30°.

[0015] Further, the skirt part and the blade are of an integral structure, and the materials of the skirt part, the blade and the hub are all stainless steel.

[0016] Further, the blade is detachably connected to the hub by bolts.

[0017] The beneficial effect of this application is that it provides a shaft tubular pump impeller with cavitation resistance for improving the cavitation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings that form a part of this application are used to provide a further understanding of this application, making other features, purposes, and advantages of this application more obvious. The schematic embodiments and their descriptions of this application are used to explain this application and do not constitute an improper limitation of this application.

[0019] In addition, throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the elements and elements are not necessarily drawn to scale.

[0020] In the drawings:

[0021] Figure 1 is the overall schematic diagram according to the embodiment of this application;

[0022] Figure 2 is the structural schematic diagram of a part of the embodiment, mainly showing the skirt part.

[0023] Reference numerals:

[0024] 1, hub; 2, blade; 3, skirt part; 4, inclined surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.

[0026] In addition, it should be noted that for ease of description, only parts related to the relevant invention are shown in the drawings. Without conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other.

[0027] It should be noted that concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence relationship of the functions performed by these devices, modules or units.

[0028] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0029] The present disclosure will be described in detail below with reference to the drawings and in combination with embodiments.

[0030] Refer to Figure 1-2 , a shaft tubular turbine pump impeller with cavitation resistance. When in use, water flows in axially along the impeller and flows out axially, including a hub 1 and blades 2; the axial direction of the hub 1 is the water inlet (as shown by the arrow in the attachment Figure 1 ), there are several blades 2 provided on the hub 1, and each blade 2 is provided with a skirt part 3. The skirt part 3 is provided on the end face of the blade 2 away from the hub 1, and the skirt part 3 faces the water inlet side. Under the action of the skirt part 3, the flow state of cavitation in the small gap is improved, and the cavitation effect can be improved. Thus, it is applied to the shaft tubular turbine pump. At the same time, through CFD simulation tests and actual measurements, the application of this impeller structure on the shaft tubular turbine pump has an obvious improvement effect on the cavitation of the impeller outer edge, and at the same time, it can extend the overhaul time of the impeller and increase the service life of the impeller.

[0031] The skirt part 3 is perpendicular to the blade 2.

[0032] The length of the skirt part 3 is greater than the distance length from both ends of the skirt part 3 to the end points of the blade 2. Let the length of the skirt part 3 be a, and the distance length from both ends of the skirt part 3 to the end points of the blade 2 be b, and b is less than

[0033] Both ends of the skirt part 3 are configured as an inclined surface 4.

[0034] The thickness of the skirt part 3 is greater than that of the blade 2, and the ratio of the thickness of the skirt part 3 to the thickness of the blade 2 ranges from 1.05 to 1.2.

[0035] The skirt part 3 and the blade 2 are of an integral structure, and the materials of the skirt part 3, the blade 2 and the hub 1 are all stainless steel. The integral structure has higher connection strength and a long service life. The stainless steel material has strong cavitation resistance.

[0036] The blade 2 as a whole has a wide-width twisted streamline shape.

[0037] The end face of the blade 2 close to the hub 1 is an inclined surface structure, and the inclination angle of the end face of the blade 2 close to the hub 1 is 15° - 30°. This increases the inlet angle and further reduces the generation of cavitation.

[0038] The blade 2 is detachably connected to the hub 1 by bolts, which facilitates the replacement of the blade 2.

[0039] The above description is only some preferred embodiments of the present disclosure and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A vertical tubular pump impeller with cavitation resistance. When in use, water flows into the impeller axially and flows out axially, including: A hub; Blades, several of which are arranged on the hub; It is characterized in that: Each blade is provided with a skirt portion, the skirt portion is arranged on the end face of the blade away from the hub, and the skirt portion faces the side where the water flows in; the length of the skirt portion is greater than the distance from both ends of the skirt portion to the end point of the blade.

2. The vertical tubular pump impeller with cavitation resistance according to claim 1, characterized in that: The length of the skirt part is a, and the distance from both ends of the skirt part to the blade end point is b, where b is less than 3. The vertical tubular pump impeller with cavitation resistance according to claim 1, characterized in that: The skirt portion is perpendicular to the blade.

4. The vertical tubular pump impeller with cavitation resistance according to claim 1, characterized in that: Both ends of the skirt portion are configured to be an inclined surface.

5. The vertical tubular pump impeller with cavitation resistance according to claim 1, characterized in that: The thickness of the skirt portion is greater than the thickness of the blade, and the thickness ratio range of the skirt portion to the blade is 1.05 - 1.

2.

6. The vertical tubular pump impeller with cavitation resistance according to claim 1, characterized in that: The end face of the blade close to the hub is a bevel structure.

7. The vertical tubular pump impeller with cavitation resistance according to claim 6, characterized in that: The inclination angle of the end face of the blade close to the hub is 15° - 30°.

8. The vertical tubular pump impeller with cavitation resistance according to claim 1, characterized in that: The skirt portion and the blade are of an integral structure, and the materials of the skirt portion, the blade and the hub are all stainless steel.

9. The vertical tubular pump impeller with cavitation resistance according to claim 1, characterized in that: The blade is detachably connected to the hub by bolts.

Images