CN211874803U - Centrifugal pump matched with filter press and impeller thereof - Google Patents

Abstract

A centrifugal pump matched with a filter press and an impeller thereof are disclosed, wherein the impeller comprises a pump shell, a pump cover, a main shaft and an impeller on the main shaft, the impeller comprises an impeller web plate, blades on the web plate and a central hole fixedly installed with the main shaft of the centrifugal pump, the blades on the surface of the web plate are a plurality of straight blades which are radial around the circle center and vertical to the surface of the web plate, and the height of the blades is gradually increased from the periphery of the web plate inwards. The utility model discloses it is big, the pressurization stage pressure height, join in marriage with power little, energy-conserving efficient at pressure filter feed stage flow.

Description

Centrifugal pump matched with filter press and impeller thereof

Technical Field

The utility model relates to a centrifugal pump for the filter press especially relates to impeller for centrifugal pump.

Background

The wear-resistant centrifugal slurry pump is a common delivery pump for feeding and pressurizing a plate-and-frame filter press. The basic flow is as follows: the slurry to be filtered is conveyed and filled into a filter cavity of the plate-and-frame filter press through a centrifugal pump, and the water in the slurry is extruded out under the conveying pressure action of the centrifugal pump after the material is filled in the filter press. And the materials difficult to be subjected to pressure filtration can be further pressurized by starting the plunger or the cylinder, so that the aim of drying the filter cake by pressure is fulfilled.

When a common centrifugal pump is used for feeding and pressurizing with a filter press, the following defects exist: firstly, the slurry needs to be input with large flow when the pressure in the plate-and-frame filter press is more than or equal to 0.1MPa within about 20 minutes of the initial feeding, so that the feeding speed of the plate-and-frame filter press can be accelerated, and the feeding time can be shortened. After the filter chamber of the plate-and-frame filter press is filled with slurry, pressure is formed, and the key requirements of filter pressing and feeding are that the feeding is converted into pressurized pressure. When the pressure in the filter cavity of the filter press is more than or equal to 0.5MPa, the feeding is characterized by small flow and high pressure. The original centrifugal slurry pump is designed according to the conventional requirements, so that the characteristic requirement of large flow cannot be met when the filter press is fed with materials; the plate and frame filter press has no characteristics of small flow and high pressure in the pressurizing period. Therefore, when a centrifugal pump is used for pressurizing the plate-and-frame filter press in the prior art, the technical performance of the centrifugal pump is not matched with the working characteristics of the filter press, and the defects that filling cannot keep up with pressure and pressure is insufficient in a pressure forcing period exist.

In order to overcome the above-mentioned disadvantages, the industry commonly uses two methods to achieve the purpose: a method for using centrifugal pump and volumetric pump in combination, namely using the centrifugal pump in the feeding period to achieve the purpose of rapidness, and converting the pressurizing period into the volumetric pump for pressurizing to achieve the purposes of high pressure and biscuit filtering. However, the method also has the disadvantages of large equipment investment and complex operation flow; the other method is to use a large-size centrifugal slurry pump with high power to achieve the purpose of large-flow filling, and in the pressure-forcing period of the small flow of the filter press, the centrifugal pump is in a stuffy pump state with small flow, low pressure and low efficiency. There is room for improvement in the field of centrifugal pumps for plate and frame filter presses.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough, provide a pressure filter adapted centrifugal slurry pump and impeller that feed stage flow is big, pressurization stage pressure is high, join in marriage with power is little, energy-conserving efficient.

For realizing the purpose of the utility model, the following technical proposal is provided: the impeller for centrifugal pump used in filter press includes impeller web, blades on the web and central hole fixed to the main shaft of centrifugal pump, and features that the blades on the surface of the web are several straight blades perpendicular to the surface of the web and have radial height gradually increased from the periphery of the web.

Preferably, adjacent blades are arranged at long and short intervals. In order to reduce the resistance of the suction inlet of the pump and facilitate the slurry to be conveyed to quickly pass through the suction inlet of the impeller blade, the structure can reduce the resistance of the slurry entering the pump cavity and can effectively improve the fluid pressure of the outlet of the centrifugal pump.

Preferably, the upper end surface of the blade is a concave cambered surface. In order to improve the anti-cavitation capability of the centrifugal pump when feeding the filter press in a low-pressure period.

Preferably, the side wall of the web is radially provided with radial pressure discharge holes. The centrifugal force of the pressure discharge hole is used for reducing pressure of the sealing part, and the pressure reduction back blade in the prior art is changed into a closed hole-shaped structure, so that the surface of a web plate of the impeller is smooth, and the abrasion of a pump shell is further reduced.

For realizing the purpose of the utility model, the utility model provides another technical scheme: a centrifugal pump used for a filter press is a front suction pump and comprises a pump shell, a pump cover, a main shaft and an impeller on the main shaft, wherein the pump cover is provided with a suction inlet.

Preferably, the suction port is formed in a flared arc shape. In order to adapt to the transportation of slurry with high solid content and high viscosity.

Preferably, the inner attack angle portion is provided with a small circular arc.

For realizing the purpose of the utility model, the utility model provides a further technical scheme: a centrifugal pump used for a filter press is a side suction pump and comprises a pump shell, a pump cover, a main shaft and an impeller on the main shaft, wherein a suction inlet is arranged at a position close to a shaft seal.

Preferably, the inner attack angle of the impeller blade and the pump cover are partially separated and installed. The local flow area is increased, and the local resistance of slurry passing is reduced.

The utility model discloses beneficial effect: by arranging the radial straight blades and utilizing the principle that the centrifugal force generated by the straight blades is greater than that of the circular arc-shaped blades, the purpose of high pressure when the pump runs at a small flow is achieved, the working height of the blades at the suction inlet is increased, the sectional area of the impeller suction inlet of the centrifugal pump is further increased, the throughput of fluid at the suction inlet is further improved, and the purpose of large flow when the pump fills the filter press at a low lift is further achieved. Through the improvement of above-mentioned two aspect impeller structures, reach large-traffic feed when satisfying the pressure filter low pressure, the filter-pressing presses the technological needs of dry period low discharge high pressure, realizes the utility model discloses a purpose. The utility model discloses pressure filter adapted pump compares with prior art, and the flow can increase about 15~20% when the low pressure is filled, and filling time reduces 15~20%, and when forcing to squeeze and strain, pump machine outlet pressure can promote 20~30% than prior art. For example, when the outlet pressure in the prior art is 0.5MPa type, the outlet pressure of the pump can reach 0.65MPa through the utility model.

Drawings

FIG. 1 is a schematic view of a prior art impeller;

FIG. 2 is a front view of embodiment 1;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a front view of embodiment 2;

FIG. 5 is a left side view of FIG. 4;

FIG. 6 is a front view of embodiment 3;

FIG. 7 is a left side view of FIG. 6;

FIG. 8 is a schematic structural view of example 4;

FIG. 9 is a schematic view of the impeller of FIG. 8;

FIG. 10 is an enlarged view of portion A of FIG. 9;

FIG. 11 is a schematic structural view of example 5;

fig. 12 is a partial enlarged view B of fig. 11.

Detailed Description

Example 1: as shown in fig. 2 and 3, the impeller 3 is an open impeller, the impeller 3 comprises an impeller web 3.4, blades 3.1 on the web 3.4 and a central hole 3.5 fixedly mounted with a centrifugal pump spindle 4, the blades 3.1 on the surface of the web 3.4 are a plurality of straight pieces which are vertical to the surface of the web and are radial around the circle center, and the height of the blades 3.1 is gradually increased from the periphery of the web inwards.

Example 2: referring to embodiment 1, as shown in fig. 4 and 5, the remaining features are unchanged, the adjacent blades 3.1 are arranged at intervals of length and length, and the upper end surface of the blade 3.1 is a concave arc surface 3.1.3.

Example 3: referring to the embodiment 2, as shown in fig. 6 and 7, the rest characteristics are unchanged, and radial pressure discharge holes 3.3 are radially formed in the side wall of the amplitude plate 3.4. The fluid is balanced at the sealing part, and simultaneously, vortex abrasion of the pump body is not generated, so that the abrasion resistance of the centrifugal pump is further improved.

Example 4: referring to the impeller of embodiment 1, as shown in fig. 8, 9, and 10, a centrifugal pump for a filter press is a front suction pump, and includes a pump housing 1, a pump cover 2, a main shaft 4, and an impeller 3 on the main shaft 4, the impeller 3 is an open impeller, the pump cover 2 is provided with a suction port, blades on the impeller 3 include an inner attack angle 3.1.2 and an outer attack angle 3.1.1, the inner attack angle 3.1.2 is a working height of the blade near the suction port, the outer attack angle 3.1.1 is a working height near the periphery of the impeller, the height of the inner attack angle 3.1.2 is more than one time the height of the outer attack angle 3.1.1, the suction port is in a horn-shaped arc shape, and the inner attack angle 3.1.2 is provided with a small. The back of the impeller web is provided with a plurality of strip-shaped back blades 3.2, the pump cover 2 is made of ultra-high molecular weight polyethylene, the end face of the pump cover is processed into a structure 2.1 which is the same as the end face of the impeller blade and is matched and installed with the working end face 3.1.3 of the impeller, and the components such as the pump shell 1, the main shaft 4, the seal 5, the bearing seat 6 and the like in the embodiment are manufactured without difference from the original steel-lined plastic wear-resistant centrifugal pump and can be manufactured according to the conventional centrifugal pump components.

After the parts are manufactured, the parts can be assembled and debugged, the assembling process and the flow are not different from the prior art, and the centrifugal pump matched with the plate-and-frame filter press with low pressure, large flow and high pressure can be obtained by debugging after the parts are assembled.

Example 5: as shown in fig. 11 and 12, a centrifugal pump for a filter press is a side suction pump, and includes a pump casing 1, a pump cover 2, a shaft seal 5, a bearing seat 6, a suction inlet tee 9, a main shaft 4 and an impeller 3 on the main shaft 4, wherein the suction inlet is arranged at a position close to the shaft seal, a blade 3.1 on the impeller 3 includes an inner attack angle 3.1.2 and an outer attack angle 3.1.1, the inner attack angle 3.1.2 is a working height of the blade 3.1 close to the suction inlet, the outer attack angle 3.1.1 is a working height close to the periphery of the impeller 3, and the height of the inner attack angle 3.1.2 is more than one time of the height of the outer attack angle 3.1.1. The inner attack angle 3.1.2 of the impeller blade and the pump cover 2 are partially separated and installed.

The suction inlet is arranged on one side of the main shaft, so that the negative pressure fluid at the suction inlet of the centrifugal pump surrounds the shaft seal 5, the shaft seal 5 is in the environment of the negative pressure fluid, and the service life of the pump seal can be effectively prolonged.

The material selection, the manufacturing process and the installation flow of each part in the embodiment are similar to those in the embodiment 4. Through the improvement, the side suction type centrifugal pump also achieves the purposes of large flow at low lift and small flow at high pressure when matched with a filter press, so that the side suction type centrifugal pump also has the advantages of high pressure and small matched motor and frame filter press.

The centrifugal pumps in embodiments 4 and 5 are made of a metal material or a non-metal material, and may be centrifugal pumps made of a composite material of a metal material and a non-metal material.

Embodiment 4, 5 the material that overflows parts such as pump case, pump cover, impeller can select non-metallic material such as plastics, pottery according to carrying the operating mode, also can select metal alloy etc. and have corrosion resistant wear-resisting function's metal material, no matter what material chooses for use all the utility model discloses a cover in.

Claims (9)

1. The impeller for centrifugal pump used in filter press includes impeller web, blades on the web and central hole fixed to the main shaft of centrifugal pump, and features that the blades on the surface of the web are several straight blades perpendicular to the surface of the web and have radial height gradually increased from the periphery of the web.

2. The filter press adapted centrifugal pump impeller of claim 1, wherein adjacent blades are arranged at a long and short interval.

3. The impeller of a centrifugal pump for filter press use according to claim 1, wherein the upper end surface of the blade is a concave curved surface.

4. The impeller of a centrifugal pump adapted to be used in a filter press as claimed in claim 1, wherein the side wall of the web is radially provided with radial pressure discharge holes.

5. A centrifugal pump for a filter press comprising an impeller according to any one of claims 1 to 4, wherein the centrifugal pump is a front suction pump and comprises a pump shell, a pump cover, a main shaft and the impeller on the main shaft, the pump cover is provided with a suction inlet, and the centrifugal pump is characterized in that blades on the impeller comprise an inner attack angle and an outer attack angle, the inner attack angle refers to the working height of the blades close to the suction inlet, the outer attack angle refers to the working height close to the periphery of the impeller, and the height of the inner attack angle is more than one time of the height of the outer attack angle.

6. The centrifugal pump adapted for filter press machine according to claim 5, wherein the suction port is formed in a flared arc shape.

7. The filter press adapted centrifugal pump according to claim 5, wherein the inner attack angle portion is provided with a small circular arc.

8. A centrifugal pump used for a filter press and comprising the impeller as claimed in any one of claims 1 to 4, wherein the centrifugal pump is a side suction pump and comprises a pump shell, a pump cover, a main shaft and the impeller on the main shaft, and a suction inlet is arranged at a position close to a shaft seal.

9. The filter press adapted centrifugal pump according to claim 8, wherein the impeller blade inner attack angle and the pump cover are partially installed separately.

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