CN211549993U - Wear-resistant multistage centrifugal pump - Google Patents

Abstract

The utility model discloses a wear-resisting multistage centrifugal pump, including the casing with set up in inside adjustment pad, antifriction plate, open impeller and the radial stator of casing, the casing comprises entrance, middle section and the export section of arranging from a left side to the right side, the adjustment pad by the antifriction plate is impressed in the tang in suction section or middle section to by the take-up screw fixed, the casing center is equipped with the pump shaft, alternate cover in proper order is equipped with adjustment axle sleeve and open impeller on the pump shaft. The open impeller is fully open, the blade is made of doubly-increased tail thickness, the open impeller is made of wear-resistant high-chromium cast iron, and the inner surface of the shell is coated with corrosion-resistant wear-resistant paint. The gap between the blade and the wear-resisting plate and between the blade and the radial guide vane can be adjusted by changing the thickness of the adjusting pad and the length of the adjusting shaft sleeve. The utility model discloses be suitable for the abrasiveness occasion, the blade clearance is easily adjusted, and the pump performance is guaranteed and is promoted.

Description

Wear-resistant multistage centrifugal pump

Technical Field

The utility model belongs to the technical field of relevant multistage pump, concretely relates to wear-resisting multistage centrifugal pump.

Background

The sectional multi-stage pump can generate higher pressure than a single-stage pump, so that the sectional multi-stage pump is widely applied to industries such as electric power, chemical engineering, steel, mines and the like.

However, because the segment type multistage pump in the prior art has a relatively complex structure, if the segment type multistage pump is used in an abrasive occasion in industries such as mines and the like, a plurality of problems and defects exist:

1. casting and processing difficulties: due to the complex structure, it is almost impossible to cast and machine when using wear-resistant materials such as high-chromium cast iron.

2. The impeller has a short service life: the impellers of the sectional multistage pump in the prior art are closed impellers, and the cover plate and the blades are very thin and can be worn through soon after being used in an abrasive environment.

To solve this problem, special designs must be used.

Disclosure of Invention

An object of the utility model is to provide a wear-resisting multistage centrifugal pump to the casting that provides in solving above-mentioned background art and processing difficulty, the lower problem of life-span.

In order to achieve the above object, the utility model provides a following technical scheme:

a wear-resistant multistage centrifugal pump comprises a shell, and an adjusting pad, a wear-resistant plate, an open impeller and a radial guide vane which are arranged in the shell, wherein the shell consists of an inlet section, a middle section and an outlet section which are arranged from left to right; the adjusting pad is pressed into a spigot of the suction section or the middle section by the wear-resisting plate and is tightened and fixed by a screw; the pump shaft is arranged in the center of the shell, and an adjusting shaft sleeve and an open impeller are sequentially sleeved on the pump shaft at intervals.

Preferably, the open impeller is full open type, and front and back apron is not had, the clearance between blade and antifriction plate and the radial stator of open impeller is 0.3 ~ 0.5 mm.

Preferably, the gap between the vane and the wear plate and the radial guide vane can be adjusted by changing the thickness of the adjusting pad and the length of the adjusting sleeve.

Preferably, the open impeller consists of a hub and 3 blades uniformly distributed on the excircle of the hub, and the blades adopt the tail thickness which is multiplied; the open impeller is made of wear-resistant high-chromium cast iron.

Preferably, the liquid-contacting inner surfaces of the static parts of the wear-resistant multistage centrifugal pump are coated with corrosion-resistant and wear-resistant coatings.

Compared with the prior art, the utility model provides a wear-resisting multistage centrifugal pump possesses following beneficial effect:

1. is suitable for abrasive occasions: the utility model discloses because the impeller is full open type, does not have front and back apron, simple structure can adopt wear-resisting materials such as high chromium cast iron to cast to the afterbody thickness of blade increases at double, and the life-span of blade that is improves greatly. Meanwhile, the surface of the inner runner is coated with the corrosion-resistant and wear-resistant coating, so that the wear resistance of the inner runner is greatly improved.

2. The blade clearance is easily adjusted, and the pump performance is guaranteed: the gap between the blade and the wear-resisting plate and between the blade and the radial guide vane can be adjusted by changing the thickness of the adjusting pad and the length of the adjusting shaft sleeve, so that the performance of the pump is not reduced. Even if the pump flow passage part is seriously abraded after the pump is used for a long time, the gap can be reduced by adjusting the thickness of the cushion and the length of the shaft sleeve, so that the hydraulic performance of the pump is improved.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description, do not constitute a limitation of the invention, in which:

FIG. 1 is a schematic structural view of a wear-resistant multistage centrifugal pump of the present invention;

FIG. 2 is an axial view of the impeller of the present invention;

FIG. 3 is a plan view of the impeller of the present invention;

in the figure: 1. an outlet section; 2. a radial guide vane; 3. a wear plate; 4. a middle section; 5. an adjustment pad; 6. adjusting the shaft sleeve; 7. an inlet section; 8. a pump shaft; 9. a key; 10. an open impeller; 11. a screw; 101. a hub; 102. a blade.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution:

a wear-resistant multistage centrifugal pump comprises a shell, and an adjusting pad 5, a wear-resistant plate 3, an open impeller 10 and a radial guide vane 2 which are arranged in the shell, wherein the shell is composed of an inlet section 7, a middle section 4 and an outlet section 1 which are arranged from left to right; the adjusting pad 5 is pressed into a spigot of the inlet section 7 or the middle section 4 by the wear-resisting plate 3 and is tightened and fixed by a screw 11; the pump shaft 8 is arranged at the center of the shell, the adjusting shaft sleeve 6 and the open impeller 10 are sequentially sleeved on the pump shaft 8 at intervals, the adjusting shaft sleeve 6 is arranged in front of and behind the open impeller 10, the pump shaft 8, the adjusting shaft sleeve 6, the open impeller 10, the key 9 and the like form a rotor part of the pump, and torque is transmitted among the adjusting shaft sleeve 6, the open impeller 10 and the pump shaft 8 through the key 9.

The open impeller 10 is fully open, and has no front and rear cover plates, and the gap between the blade 102 of the open impeller 10 and the wear-resistant plate 3 and the radial guide vane 2 is 0.3-0.5 mm. The open impeller 10 without the front and rear cover plates is more suitable for conveying abrasive media than the closed impeller, while the disc hydraulic losses of the closed impeller of the conventional multistage pump are avoided due to the absence of the front and rear cover plates. The small clearance between the vanes 102 and the wear plate 3 and radial vanes 2 ensures that the pump does not incur significant volume losses.

The gap between the blade 102 and the wear plate 3 and the radial guide vane 2 can be adjusted by changing the thickness of the adjusting pad 5 and the length of the adjusting sleeve 6. During the first assembly, the adjusting pads 5 with different thicknesses and the adjusting shaft sleeves 6 with different lengths can be adopted in an optional mode to ensure the gaps in front of and behind the blades 102, so that the performance of the pump is ensured.

The open impeller 10 is composed of a hub 101 and 3 blades 102 uniformly distributed on the circumference of the hub 101, and the blades 102 adopt the tail thickness which is multiplied; the open impeller 10 is made of wear-resistant high-chromium cast iron. The small number of blades makes the flow passage of the open impeller 10 wider, less prone to clogging, and more suitable for abrasive media with impurities. The increased thickness of the wear-resistant high-chromium cast iron and the enlarged tail of the blade 102 may provide a longer life for the blade 102.

The liquid-contacting inner surface of a static part of the wear-resistant multistage centrifugal pump is coated with the corrosion-resistant wear-resistant coating, so that the design is economical, convenient and quick, and on the premise of increasing little cost, good wear resistance can be obtained through a simple coating process.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The utility model provides a wear-resisting multistage centrifugal pump which characterized in that: the impeller comprises a shell, and an adjusting pad, a wear-resisting plate, an open impeller and a radial guide vane which are arranged in the shell, wherein the shell consists of an inlet section, a middle section and an outlet section which are arranged from left to right; the adjusting pad is pressed into a spigot of the suction section or the middle section by the wear-resisting plate and is tightened and fixed by a screw; the pump shaft is arranged in the center of the shell, and an adjusting shaft sleeve and an open impeller are sequentially sleeved on the pump shaft at intervals.

2. A wear resistant multistage centrifugal pump according to claim 1, characterized in that: the open impeller is full open type, and front and back apron is not had, the clearance between blade and antifriction plate and the radial stator of open impeller is 0.3 ~ 0.5 mm.

3. A wear resistant multistage centrifugal pump according to claim 1, characterized in that: the gap between the blade and the wear-resisting plate and between the blade and the radial guide vane can be adjusted by changing the thickness of the adjusting pad and the length of the adjusting shaft sleeve.

4. A wear-resistant multistage centrifugal pump according to claim 1 or 2, characterized in that: the open impeller consists of a hub and 3 blades uniformly distributed on the excircle of the hub, and the blades adopt doubled and enlarged tail thickness; the open impeller is made of wear-resistant high-chromium cast iron.

5. A wear resistant multistage centrifugal pump according to claim 1, characterized in that: the inner surface of a static part of the wear-resistant multistage centrifugal pump in a liquid contact state is coated with a corrosion-resistant wear-resistant coating.

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