Low-abrasion dredge pump impeller
By designing the blade tail end and middle uniform thickness section of the elliptical arc structure in the mud pump impeller, the problem of traditional impeller damage due to the impact of sand and gravel is solved, achieving higher structural strength and service life, and improving the efficiency of the impeller. Job stability and continuity.
Patent Information
- Application Number
- CN202420917462.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-04-29
AI Technical Summary
Due to the design characteristics, traditional dredging mud pump impellers are easily damaged due to the impact of mud and sand and gravel, which shortens their service life and affects their working stability and continuity.
A low-wear mud pump impeller is designed. The tail end of the blade adopts an elliptical arc surface structure, which eliminates the too thin blade-like structure at the end of the traditional blade, and improves the structural strength of the blade through the design of a uniformly thick section in the middle.
This design improves the structural strength of the blades, extends the service life of the impeller, and effectively improves the stability and continuity of the mud pump operation.
Smart Images
Figure CN222376789U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of dredging engineering, in particular to a low-wear mud pump impeller. Background Art
[0002] Dredging mud pumps are widely used on dredgers. Because the mud pumps convey high concentration mud and contain gravel and stones, the mud pumps are not only worn by mud but also impacted by stones during operation. Figure 5 As shown, in the traditional dredging mud pump impeller structure, due to its design characteristics of few blades and large wrap angle, the angle between the curved arc of the blade near the outlet position and the outer edge contour line of the front and rear cover plates is usually small, and the blade end 1 is thinner and blade-shaped, which is easily damaged after being impacted by mud, sand and gravel, shortening the service life of the impeller and affecting the stability and continuity of the mud pump operation. Utility Model Content
[0003] The utility model is developed to solve the above problems and aims to provide a low-wear mud pump impeller.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] A low-wear mud pump impeller comprises a front cover plate and a rear cover plate arranged opposite to each other and a plurality of blades arranged between the front cover plate and the rear cover plate around the center line of the impeller, an impeller suction port is provided in the middle of the front cover plate, and an impeller outlet is formed between the outer edges of the front cover plate and the rear cover plate, wherein:
[0006] The blade includes a head end close to the impeller suction port, a tail end close to the impeller outlet, and a middle uniform thickness section connecting the head end and the tail end;
[0007] The middle uniform thickness section has a first side surface facing the outside of the impeller and a second side surface facing the inside of the impeller;
[0008] The tail end has a first end surface facing the outside of the impeller and a second end surface facing the inside of the impeller, and the first end surface is connected to the edge of the second end surface;
[0009] When the blade is unfolded and laid flat, the first end surface is a plane obliquely connected to the first side surface, and the second end surface is an elliptical arc surface tangent to the second side surface.
[0010] Furthermore, when the blade is unfolded and laid flat, the head end is semi-elliptical, the middle uniform thickness section is flat, and the short axis length of the ellipse corresponding to the head end is consistent with the thickness of the middle uniform thickness section.
[0011] Furthermore, when the blade is unfolded and laid flat, a straight line formed by the intersection of the middle surface of the middle uniform thickness section in the thickness direction and the cross section of the blade is used as a reference datum line;
[0012] In the finished impeller, the blades are bent, that is, bent with reference to the reference line, and the first end surface is bent into an arc consistent with the outer edge of the front cover plate / rear cover plate.
[0013] Preferably, the thickness h of the middle uniform thickness section is 5%-7% of the diameter D of the impeller suction port.
[0014] Preferably, when the blade is unfolded and laid flat, the two foci of the ellipse corresponding to the second end face are both on the reference datum line, the major semi-axis length a of the ellipse corresponding to the second end face is 1.5 times the thickness h of the middle uniform thickness section, and the minor semi-axis length b is 0.5 times the thickness h of the middle uniform thickness section.
[0015] Furthermore, in the cross section of the blade at any position in the axial direction of the impeller, the contour shape and size of the head end and the tail end remain unchanged, and the thickness of the middle uniform thickness section remains unchanged.
[0016] Furthermore, the length of the middle uniform thickness section on each cross section increases gradually from the front cover plate to the rear cover plate.
[0017] Compared with the prior art, the utility model has the following beneficial effects:
[0018] 1. In the low-wear mud pump impeller of the utility model, the tail end of the blade adopts an elliptical arc surface to eliminate the thin blade-like structure of the traditional blade end, thereby improving the structural strength of the blade and not hindering the flow of mud.
[0019] 2. In the low-wear mud pump impeller of the utility model, the tail end of the blade is not easy to wear, which extends the service life of the impeller and can effectively improve the stability and continuity of the mud pump operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a half-section axonometric view of the low-wear mud pump impeller of the utility model;
[0021] Figure 2 It is a cross-sectional view of the low-wear mud pump impeller of the utility model;
[0022] Figure 3 It is an isometric cross-sectional view of the low-wear mud pump impeller of the utility model;
[0023] Figure 4 It is a schematic cross-sectional view of the blades of the utility model when they are unfolded;
[0024] Figure 5 It is a cross-sectional view of a conventional mud pump impeller.
[0025] Figure Number:
[0026] 1- blade tip;
[0027] 10-front cover, 11-impeller suction port, 20-rear cover, 30-hub, 40-blades, 50-mud flow channel, 60-impeller outlet;
[0028] 401 - low pressure surface, 402 - high pressure surface, 41 - head end, 42 - tail end, 421 - first end surface, 422 - second end surface, 43 - middle uniform thickness section, 431 - first side surface, 432 - second side surface. DETAILED DESCRIPTION
[0029] In order to make the technical means, creative features, objectives and effects achieved by the utility model easier to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate the mud pump impeller of the utility model.
[0030] Example
[0031] like Figures 1 to 3 As shown, this embodiment provides a low-wear mud pump impeller, including a front cover plate 10 and a rear cover plate 20 arranged opposite to each other, a hub 30 connected to the rear cover plate 20, and a plurality of blades 40 arranged between the front cover plate 10 and the rear cover plate 20 around the center line of the impeller. An impeller suction port 11 is provided in the middle of the front cover plate 10, a mud flow channel 50 is formed between adjacent blades 40, and an impeller outlet 60 is formed between the outer edge of the front cover plate 10 and the outer edge of the rear cover plate 20. The blade 40 is spirally bent around the center line of the impeller, and the side of the blade 40 facing the inside of the impeller is a low-pressure surface 401, and the side facing the outside of the impeller is a high-pressure surface 402.
[0032] The blade 40 includes a head end 41 close to the impeller suction port, a tail end 42 close to the impeller outlet 60 , and a middle uniform thickness section 43 connecting the head end 41 and the tail end 42 .
[0033] The middle uniform thickness section 43 has a first side surface 431 facing the outside of the impeller and a second side surface 432 facing the inside of the impeller. The tail end 42 has a first end surface 421 facing the outside of the impeller and a second end surface 422 facing the inside of the impeller. The edge of the first end surface 421 is connected to the edge of the second end surface 422 at the impeller outlet 60.
[0034] like Figure 4 As shown, when the blade is unfolded and laid flat, the first end surface 421 of the tail end 42 is a plane obliquely connected to the first side surface 431 , and the second end surface 422 is an elliptical arc surface tangent to the second side surface 432 .
[0035] Specifically, when the blade is unfolded and laid flat, the straight line formed by the intersection of the middle surface of the middle uniform thickness section 43 in the thickness direction and the blade cross section is used as the reference datum line ( Figure 4The blade tip 41 is semi-elliptical, the middle uniform thickness section 43 is flat, and the length of the minor axis of the ellipse corresponding to the blade tip 41 is consistent with the thickness of the middle uniform thickness section 43. The semi-elliptical surface of the tip 41 is smoothly connected to the two side surfaces of the middle uniform thickness section 43. In the finished impeller, the blade 40 is bent as a whole, that is, bent with reference to the reference line. At this time, the first end surface 421 is bent to an arc consistent with the outer edge of the front cover plate 10 / rear cover plate 20 ( Figures 1 to 3 ).
[0036] Furthermore, the thickness h of the middle uniform thickness section 43 is 5%-7% of the diameter D of the impeller suction port 11. Considering the wear life of the blade 40 and the passing capacity of the mud flow channel 50, if the thickness h is too small, the blade 40 is thin, and the structural strength will lead to weak structural strength and poor wear resistance; if the thickness h is too large, the blade 40 is thick, which will cause the mud flow channel 50 to be easily blocked, increase the fluid flow rate in the flow channel, reduce the passing capacity of the impeller and aggravate the wear of the blade 40.
[0037] Furthermore, when the blade is unfolded and laid flat, the two foci of the ellipse corresponding to the second end surface 422 on the tail end 42 are both on the reference datum line. Preferably, the length a of the major axis of the ellipse corresponding to the second end surface 422 is 1.5 times the thickness h of the middle uniform thickness section 43, and the length b of the minor axis is 0.5 times the thickness h of the middle uniform thickness section 43.
[0038] Taking the diameter D of the impeller suction port 11 as 800 mm, the thickness of the middle uniform thickness section 43 of the blade is h=(5%-7%)D=(40-56) mm. For the convenience of subsequent calculation, h is taken as 50 mm, and the length of the major semi-axis of the ellipse corresponding to the second end surface 422 is a=1.5h=75 mm, and the length of the minor semi-axis is b=0.5h=25 mm.
[0039] In this embodiment, the corresponding relationship between various parameters is determined by proportion, and the impeller blade 40 structure can be proportionally enlarged or reduced based on the design needs of mud pumps with different specifications and performances without affecting the use effect. It has a wide range of uses and strong practicality.
[0040] In the blade cross section at any position in the impeller axial direction, the contour shape and size of the head end 41 and the tail end 42 remain unchanged, and the thickness of the middle uniform thickness section 43 remains unchanged. In this embodiment, the length of the middle uniform thickness section 43 on each cross section increases in sequence from the front cover plate 10 to the rear cover plate 20, the edge line of the head end 41 of the blade 40 close to the impeller suction port 11 is inclined, and the edge of the tail end 42 close to the impeller outlet 60 is flush with the edges of the front and rear cover plates 20.
[0041] Furthermore, the connection between the blade 40 and the front cover plate 10 and the rear cover plate 20 is provided with a fillet transition (not shown in the figure), which can reduce the edges and corners inside the mud flow channel 50, making the mud fluid flow smoother and more stable. Preferably, the fillet radius R is 40mm to 60mm, and in this embodiment, the fillet radius R is 50mm.
[0042] It should be noted that the design of the contour shape of the impeller blade 40 is simplified by expressing the blade 40 in an unfolded state, which is a common method in the centrifugal pump industry, which can reduce the workload and is easy to explain. The shape and size parameters of the blade 40 when it is flat and unfolded are slightly different from those of the actual curved shape, which has little effect on the working effect and can be ignored.
[0043] The above implementation modes are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.
Claims
1. A low-wear mud pump impeller, comprising a front cover plate and a rear cover plate arranged opposite to each other and a plurality of blades arranged between the front cover plate and the rear cover plate around the center line of the impeller, wherein the middle of the front cover plate has an impeller suction port, and an impeller outlet is formed between the outer edge of the front cover plate and the outer edge of the rear cover plate, characterized in that: in: The blade comprises a head end close to the impeller suction port, a tail end close to the impeller outlet, and a middle uniform thickness section connecting the head end and the tail end; The middle uniform thickness section has a first side surface facing the outside of the impeller and a second side surface facing the inside of the impeller; The tail end has a first end surface facing the outside of the impeller and a second end surface facing the inside of the impeller, and the first end surface is connected to the edge of the second end surface; When the blade is unfolded and laid flat, the first end surface is a plane obliquely connected to the first side surface, and the second end surface is an elliptical arc surface tangent to the second side surface.
2. The low-wear mud pump impeller according to claim 1, characterized in that: When the blade is unfolded and laid flat, the head end is semi-elliptical, the middle uniform thickness section is flat, and the minor axis length of the ellipse corresponding to the head end is consistent with the thickness of the middle uniform thickness section.
3. The low-wear mud pump impeller according to claim 1, characterized in that: When the blade is unfolded and laid flat, a straight line formed by the intersection of the middle surface of the middle uniform thickness section in the thickness direction and the cross section of the blade is used as a reference datum line; In the finished impeller, the blades are bent, that is, the reference datum line is bent, and the first end surface is bent into an arc consistent with the outer edge of the front cover plate / rear cover plate.
4. The low-wear mud pump impeller according to claim 1, characterized in that: The thickness h of the middle uniform thickness section is 5%-7% of the diameter D of the impeller suction port.
5. The low-wear mud pump impeller according to claim 3, characterized in that: When the blade is unfolded and laid flat, the two foci of the ellipse corresponding to the second end face are both on the reference datum line, the major semi-axis length a of the ellipse corresponding to the second end face is 1.5 times the thickness h of the middle uniform thickness section, and the minor semi-axis length b is 0.5 times the thickness h of the middle uniform thickness section.
6. The low-wear mud pump impeller according to claim 1, characterized in that: In the cross section of the blade at any position in the axial direction of the impeller, the contour shape and size of the head end and the tail end remain unchanged, and the thickness of the middle uniform thickness section remains unchanged.
7. The low-wear mud pump impeller according to claim 6, characterized in that: The length of the middle uniform thickness section on each of the cross sections increases gradually from the front cover plate to the rear cover plate.