WO2018226035A1

WO2018226035A1 - Centrifugal slurry pump and impeller

Info

Publication number: WO2018226035A1
Application number: PCT/KR2018/006458
Authority: WO
Inventors: 이재웅
Original assignee: 이재웅
Priority date: 2017-06-08
Filing date: 2018-06-07
Publication date: 2018-12-13
Also published as: KR101826819B1; AU2018281248A1; AU2018281248B2

Abstract

The present invention relates to a centrifugal slurry pump for pumping a fluid in the form of a slurry, and an impeller. The centrifugal slurry pump comprises: a case having a receiving space formed therein, a case inlet formed at one side thereof, and a case outlet formed at the other side thereof; and an impeller, installed in the receiving space of the case so as to be rotated by means of a motor, having a central inlet formed on one side thereof so as to suck the slurry through the case inlet, and having at least one vane formed thereinside so as to forcibly discharge the slurry in the direction of the case outlet by centrifugal force, wherein an impeller-side annular sealing surface adjacent to the central inlet of the impeller may be formed to be inclined at a first angle that is an obtuse angle, with respect to the axis of rotation, opposite to the flow direction of the fluid, and a case-side annular sealing surface adjacent to the case inlet of the case may be formed at least partially in parallel with the impeller-side annular sealing surface.

Description

Centrifugal Slurry Pumps and Impellers

The present invention relates to centrifugal slurry pumps and impellers, and more particularly, to centrifugal slurry pumps and impellers for pumping fluid in slurry form.

In general, a centrifugal pump is a device that rotates a fluid by using an impeller installed inside a case and pumps the fluid by centrifugal force. An impeller is composed of a plurality of blades formed in a radial whirlwind shape and has a relatively low density such as water. There is no major problem in the transport of materials, but in the case of transporting very dense fluids with high density such as dense oils, wastewater slurries, suspensions, concentrates or mixtures thereof, the resistance is very high and the case and the rotating impeller are fixed. The low pressure portion is generated in between, and the low pressure portion inevitably causes evaporation of the water contained in the slurry, thereby generating bubbles or voids, and when such bubbles or voids are generated, the impeller turns away and the transport efficiency is greatly reduced. Even when the interface between these bubbles or voids collapses, Explosive phenomena occur inside the pump, and there are many problems such as severe damage to the inside of the centrifugal pump, deterioration of parts, durability of various parts such as a case and an impeller.

In the conventional centrifugal slurry pump described in Korean Patent No. 10-0225027, as shown in FIG. 7, a case side annular seal surface F1 is formed in a case, and an impeller side annular seal surface F2 is formed on the impeller so as to be parallel thereto. In this case, the case side annular seal surface F1 and the impeller side annular seal surface F2 are formed to be inclined at a second angle Q which is an acute angle smaller than 90 degrees with respect to the rotation axis which is the reverse direction of the fluid flow. Can be.

This conventional centrifugal slurry pump has a fluid flow between the case side annular seal surface F1 and the impeller side annular seal surface F2, as indicated by the dashed arrows due to the flow of the main fluid V1 (V2) direction. The impeller-side annular seal surface F2 is concealed from the flow of the fluid by using the seal surfaces F1 and F2 that are inclined inclined in a direction to be combined with the flow V1 and V2 of the main fluid, so that the mechanical friction of the impeller It is designed to minimize this.

However, such a conventional centrifugal slurry pump may reduce the mechanical friction of the impeller, but as shown in FIG. 7, the flow of the case-side fluid having a fixed velocity of the rotating impeller side fluid flow V2 ( V1) is faster and the flow between the case side annular seal surface F1 and the impeller side annular seal surface F2 accelerates the velocity of the impeller side fluid flow V2 faster, as indicated by the arrow indicated by the dashed line. The low pressure part is formed, and the occurrence of bubbles or voids due to the occurrence of such a low pressure part causes the boundary of the centrifugal slurry pump to break down due to the air pressure, which causes severe explosion or explosion of bubbles or voids. More problems have arisen such as greatly reducing the durability of the various parts such as wear and case, impeller between them.

In addition, since the impeller and the case are less durable, the impeller must be replaced frequently, and the case must be separately installed with a metal outer case and a replaceable rubber inner case installed therein. There are many problems, such as the increase in manufacturing cost, the complicated structure, the increase in manufacturing cost, and the increase in operating and maintenance costs due to replacement of parts.

The present invention is to solve a number of problems including the above problem, the case side annular seal surface and the impeller side annular seal surface is an obtuse angle greater than 90 degrees relative to the axis of rotation that is the reverse of the fluid flow first angle It is formed to be inclined so as to prevent the occurrence of low pressure parts, thereby preventing the occurrence of bubbles or voids, thereby preventing damage, abrasion, and deterioration of the centrifugal slurry pump due to the explosion of bubbles or voids. By precisely controlling the flow of fluid between the seal surface and the annular seal surface on the impeller side using a step, pumping efficiency can be maximized in an optimal condition according to the type of slurry, size, or use environment. Centrifugal slurry pumps and impellers to reduce manufacturing, operating and maintenance costs The purpose is to provide. However, these problems are exemplary, and the scope of the present invention is not limited thereby.

Centrifugal slurry pump according to the idea of the present invention for solving the above problems, the housing space is formed inside, the case inlet is formed on one side, the case is formed on the other side outlet; And a central suction port formed at one side to suck the slurry through the case inlet port so as to be rotated by a motor, and to force the slurry toward the case outlet port by using a centrifugal force. And an impeller having at least one vane formed therein so as to be discharged from the impeller, wherein the impeller-side annular seal surface adjacent to the central suction port of the impeller has an obtuse angle based on an axis of rotation opposite to the fluid flow. The case side annular seal surface formed to be inclined at an angle and adjacent to the case inlet of the case may be formed at least partially in parallel with the impeller side annular seal surface.

In addition, according to the present invention, the first angle may be 100 degrees to 135 degrees.

Further, according to the present invention, the width W of the flat portion of the impeller side annular seal surface may be between 5 and 25 percent of the central inlet diameter D1.

In addition, according to the present invention, the impeller, the vane is formed in a vortex radially in the circumferential direction from the central suction port in the inner side, the vane is a circular or elliptical shape of the cross section through which the fluid passes, The area of the passage cross section may be wider from the center toward the circumferential direction.

In addition, according to the present invention, the case may be an integrated case of a metallic material having an outer surface in contact with the outside air and an inner surface corresponding to the impeller.

In addition, the centrifugal slurry pump according to the present invention, the impeller forward and backward for advancing the impeller back and forth so as to adjust the distance (S) between the impeller side annular seal surface of the impeller and the case side annular seal surface of the case. The apparatus may further include.

Further, according to the present invention, the diameter D2 of the case suction port may be larger than the diameter D1 of the central suction port so that a step T may be generated at the case suction port and the central suction port.

On the other hand, the impeller according to the idea of the present invention for solving the above problems, the central suction port is formed on one side, at least one vane is formed therein to forcibly discharge the slurry in the direction of the case outlet using centrifugal force The impeller-side annular seal surface adjacent to the central suction port may be formed to protrude at an obtuse angle with respect to an axis of rotation opposite to the fluid flow.

In addition, according to the present invention, the vane is formed in a vortex radially inward from the central suction port toward the circumferential direction, the shape of the passage cross section through which the fluid passes is circular or elliptical, the area of the passage cross section is the center It can be widened in the circumferential direction from.

According to some embodiments of the present invention made as described above, it is possible to prevent the generation of bubbles or voids by preventing the occurrence of the low-pressure portion, thereby causing damage, wear, durability of the centrifugal slurry pump due to the explosion phenomenon of bubbles or voids Deterioration can be prevented, and the flow of fluid between the case-side annular seal surface and the impeller-side annular seal surface is precisely controlled by using a step, so that pumping efficiency can be optimized according to the type of slurry, size, or use environment. It can maximize the cost and reduce the manufacturing cost, operation cost and management cost of the product by using a single case. Of course, the scope of the present invention is not limited by these effects.

1 is a front perspective view of a centrifugal slurry pump in accordance with some embodiments of the present invention.

FIG. 2 is a rear perspective view of the centrifugal slurry pump of FIG. 1. FIG.

3 is an exploded perspective view of parts showing the centrifugal slurry pump of FIG. 1.

4 is a partial cut cross-sectional view illustrating the centrifugal slurry pump of FIG. 1.

FIG. 5 is an enlarged cross-sectional view showing an enlarged portion B of the centrifugal slurry pump of FIG. 4.

6 is an enlarged cross-sectional view illustrating a centrifugal slurry pump in accordance with some other embodiments of the present invention.

7 is an enlarged cross-sectional view showing a conventional centrifugal slurry pump.

8 is a front perspective view of an impeller in accordance with some embodiments of the present invention.

9 is a rear perspective view illustrating the impeller of FIG. 8.

10 is a sectional front view of the impeller of FIG. 8.

FIG. 11 is a side cross-sectional view illustrating the impeller of FIG. 8.

Hereinafter, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in various other forms, and the scope of the present invention is It is not limited to an Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of description.

Throughout the specification, when referring to one component, such as a film, region or substrate, being positioned on, "connected", "stacked" or "coupled" to another component, said one configuration It may be interpreted that an element may be in direct contact with, or “coupled to”, “stacked” or “coupled” another component, or that there may be further components interposed therebetween. On the other hand, when one component is said to be located on another component "directly on", "directly connected", or "directly coupled", it is interpreted that there are no other components intervening therebetween. do. Like numbers refer to like elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various members, parts, regions, layers, and / or parts, these members, parts, regions, layers, and / or parts are defined by these terms. It is obvious that not. These terms are only used to distinguish one member, part, region, layer or portion from another region, layer or portion. Thus, the first member, part, region, layer or portion, which will be discussed below, may refer to the second member, component, region, layer or portion without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "bottom" or "bottom" may be used herein to describe the relationship of certain elements to other elements as illustrated in the figures. It may be understood that relative terms are intended to include other directions of the device in addition to the direction depicted in the figures. For example, if the device is turned over in the figures, elements depicted as present on the face of the top of the other elements are oriented on the face of the bottom of the other elements. Thus, the exemplary term "top" may include both "bottom" and "top" directions depending on the particular direction of the figure. If the device faces in the other direction (rotated 90 degrees relative to the other direction), the relative descriptions used herein can be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. Also, as used herein, "comprise" and / or "comprising" specifies the presence of the mentioned shapes, numbers, steps, actions, members, elements and / or groups of these. It is not intended to exclude the presence or the addition of one or more other shapes, numbers, acts, members, elements and / or groups.

Embodiments of the present invention will now be described with reference to the drawings, which schematically illustrate ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, embodiments of the inventive concept should not be construed as limited to the specific shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is a front perspective view illustrating a centrifugal slurry pump 100 according to some embodiments of the present invention, FIG. 2 is a rear perspective view illustrating the centrifugal slurry pump 100 of FIG. 1, and FIG. 3 is a centrifugal slurry of FIG. 1. 4 is a partially exploded sectional view showing the centrifugal slurry pump 100 of FIG. 1, and FIG. 5 is an enlarged view showing an enlarged part B of the centrifugal slurry pump 100 of FIG. 4. It is a cross section.

First, as shown in FIGS. 1 to 5, the centrifugal slurry pump 100 according to some embodiments of the present invention may include a frame 10, a case 20, and an impeller 30. have.

For example, as shown in Figures 1 to 5, the frame 10 is installed on the floor to support the load of the case 20 and the impeller 30 is sufficient to withstand mechanical stress during operation It may be a structure having strength and durability. For example, the frame 10 may be an assembly structure such as a metal material formed by assembling various horizontal members, vertical members, and block members having various shapes with fasteners.

However, the frame 10 is not necessarily limited to the drawings, and various frame structures having a wide variety of shapes capable of supporting the case 20 and the impeller 30 may be applied.

For example, as shown in FIGS. 1 to 5, the case 20 is fixed to one side of the frame 10, and an accommodation space in which the impeller 30 is accommodated is formed therein. The case inlet 20a may be formed at one side, and may be a cylindrical structure in which the case outlet 20b is formed at the other side.

More specifically, for example, the case 20 may be an integrated case of a metal material having an outer surface contacting the outside air and an inner surface corresponding to the impeller 30.

The case 20, as described above, can reduce the wear rate of the parts by reducing the occurrence of conventional bubbles or voids by the angle of the annular seal surface to be described later, because there is no need to replace the parts through this separate No need for a replaceable inner case can significantly reduce the operating and maintenance costs of the pump.

Also, for example, as shown in FIGS. 1 to 5, the impeller 30 is installed in the accommodation space of the case 20 to be rotated by the motor M installed in the frame 10. As a center suction port 30a is formed at one side to allow the slurry to be sucked through the case suction port 20a, and therein, the slurry may be forcibly discharged toward the case discharge port 20b by using a centrifugal force. It may be a kind of rotary wing structure in which at least one vane 30b is formed.

4 and 5, the impeller 30 has an impeller-side annular seal surface F2 formed at a portion adjacent to the central suction port 30a, and the case 20 has the impeller. A case side annular seal surface F1 may be formed at a portion adjacent to the case inlet 20a to face the side annular seal surface F2.

The impeller-side annular seal surface F2 is formed to be inclined at a first angle K that is an obtuse angle with respect to the rotation axis L opposite to the fluid flow, and the case-side annular seal surface F1 is At least a portion may be formed in parallel with the impeller-side annular seal surface F2 to be inclined at an angle substantially equal to the first angle K. FIG.

Here, the first angle K may be an obtuse angle of more than 90 degrees. As a result of the repeated simulation and experiment, the first angle K, which can minimize the generation of bubbles or voids due to the occurrence of the low pressure portion, may be 100 degrees to 135 degrees.

In other words, if the first angle K is too large, manufacturing or assembling parts becomes cumbersome, and if the first angle K is too small, the effect of bubbles or voids is lowered, so that an appropriate value may be selected and applied.

Thus, as shown in FIG. 5, the first angle K is between the case side annular seal surface F1 and the impeller side annular seal surface F2, as the flow of the main fluid is indicated by a dotted arrow. It is inclined inclined in the direction to branch and exit, if the distance (S) between the case side annular seal surface (F1) of the case 20 can be minimized theoretically and experimentally it can minimize the formation of the low pressure portion.

Here, the spacing (S) between the case side annular seal surface (F1) of the case 20 by using the impeller front and rear devices 40 to be described later can be minimized, and by preventing the occurrence of low pressure portion It is possible to prevent the generation of voids, thereby preventing damage, wear and deterioration of the centrifugal slurry pump due to the explosion phenomenon of bubbles or voids.

In addition, when the gap S between the case side annular seal surface F1 of the case 20 is minimized, the sealing efficiency between the case 20 and the impeller 30 is improved to improve the efficiency of the pump. The width W of the flat portion of the impeller-side annular seal surface F2 may be between 5 and 25 percent of the diameter D1 of the central suction port 30a to allow sufficient sealing through repeated experiments and simulations. It may be a percentage.

However, it is not necessarily limited to these values, and the width of the seal face may be applied with a wide variety of diameter-to-diameter ratios depending on the type of slurry, the size of the pump, the operating environment or conditions, and the like.

For example, as illustrated in FIGS. 1 to 4, the impeller forward and backward apparatus 40 includes the impeller side annular seal surface F2 of the impeller 30 and the case of the case 20. As a device for advancing and retracting the impeller 30 to adjust the distance S between the side annular seal surfaces F1, a wide variety of devices capable of moving the impeller 30 may be used.

For example, as shown in FIGS. 1 and 2, the frame 10 may be installed, and a forward and backward adjustment screw may be installed to press the impeller 30. However, it is not necessarily limited to the drawings, it is possible to use a screw rod, a guide rod or the like which is automatically adjusted back and forth position by the motor.

In addition, a wide variety of position adjusting screws and the like may be additionally installed to keep the rotation trajectory of the impeller 30 constant so that the impeller 30 does not swing when the impeller 30 rotates.

6 is an enlarged cross-sectional view illustrating a centrifugal slurry pump 100 in accordance with some other embodiments of the present invention.

As shown in FIG. 6, the centrifugal slurry pump 100 according to some other embodiments of the present invention may allow the step T to be generated at the case inlet 20a and the central inlet 30a. The diameter D2 of the suction port 20a may be larger than the diameter D1 of the central suction port 30a.

Thus, as the flow of the main fluid is indicated by the dotted arrow by the step T, the impeller side annular seal surface F2 of the impeller 30 and the case side annular seal surface of the case 20. The amount of branching between (F1) can be minimized.

That is, when there is no step T, a main flow is likely to branch between the impeller side annular seal surface F2 of the impeller 30 and the case side annular seal surface F1 of the case 20. Is high, but in the case side annular seal surface F1 where the inlet between the impeller side annular seal surface F2 and the case side annular seal surface F1 is relatively protruded, when the step T is present. By being concealed by the impeller-side annular seal surface (F2) and the case-side annular seal surface (F1) can be minimized to be introduced.

However, since the low pressure portion may occur when the step T is too large, the step T may be optimally designed according to the type of slurry, the size of the pump, the operating environment, or the like.

That is, by precisely controlling the flow of the fluid between the case side annular seal surface F1 and the impeller side annular seal surface F2 using the step T, the type, size, or use environment of the slurry can be Therefore, the pumping efficiency can be maximized in an optimal condition.

8 is a front perspective view of the impeller 30 in accordance with some embodiments of the present invention, FIG. 9 is a rear perspective view of the impeller 30 of FIG. 8, and FIG. 10 is a representation of the impeller 30 of FIG. 8. It is a front sectional view, and FIG. 11 is a side sectional view which shows the impeller 30 of FIG.

For example, as shown in Figures 3 to 11, the impeller 30, the vane 30b is formed in a vortex radially from the central suction port 30a toward the circumferential direction, the vane 30b ) May have a circular or elliptic shape in which the passage cross sections A1 and A2 pass through the fluid, and the passage cross sections A1 and A2 may be formed in such a manner that the area of the passage cross sections A1 and A2 increases from the center to the circumferential direction. .

Therefore, since the shape of the passage cross-section (A1) (A2) through which the fluid passes is circular or elliptical shape, it is possible to maximize the efficiency of the impeller 30 by minimizing the angled corner portion causing energy loss inside.

The present invention includes the above-described centrifugal slurry pump 100, as well as an impeller 30 applied thereto, and the impeller 30 according to some embodiments of the present invention is shown in FIGS. 3 to 11. As shown, a central suction port (30a) is formed on one side, at least one vane (30b) is formed therein to forcibly discharge the slurry toward the case outlet (20b) using a centrifugal force, the center The impeller-side annular seal surface F2 adjacent to the suction port 30a may be formed to be inclined at a first angle K that is an obtuse angle with respect to the rotation axis L opposite to the fluid flow.

Here, the vanes 30b are formed in a vortex radially inward from the central suction port 30a in the circumferential direction, and have a circular or elliptical shape in which the passage cross sections A1 and A2 pass through the fluid. The area of the passage cross sections A1 and A2 may be wider from the center toward the circumferential direction.

Therefore, according to the centrifugal slurry pump 100 and the impeller 30 of the present invention, it is possible to prevent the generation of bubbles or voids by preventing the occurrence of the low-pressure portion, thereby preventing the occurrence of bubbles or voids in the centrifugal slurry pump It can prevent damage, abrasion, and deterioration of durability, and precisely controls the flow of fluid between the case side annular seal surface and the impeller side annular seal surface by using a step, so that it is optimal according to the type of slurry, size, or use environment. In this condition, pumping efficiency can be maximized, and a single case can be used to reduce the manufacturing cost, operation cost and maintenance cost of the product.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to some embodiments of the present invention made as described above, it is possible to prevent the generation of bubbles or voids by preventing the occurrence of the low-pressure portion, thereby causing damage, wear, durability of the centrifugal slurry pump due to the explosion phenomenon of bubbles or voids Deterioration can be prevented, and the flow of fluid between the case-side annular seal surface and the impeller-side annular seal surface is precisely controlled by using a step, so that pumping efficiency can be optimized according to the type of slurry, size, or use environment. The single case can be used to reduce the manufacturing, operating and maintenance costs of the product.

Claims

A case in which an accommodation space is formed, a case inlet is formed at one side, and a case outlet is formed at the other side; And

It is installed in the receiving space of the case so as to be rotated by a motor, a central suction port is formed on one side so that the slurry can be sucked through the case inlet, and forcibly pushes the slurry toward the case outlet by using a centrifugal force And an impeller having at least one vane formed therein so as to be discharged.

The impeller-side annular seal surface adjacent to the central suction port of the impeller is formed to be inclined at an obtuse first angle with respect to the rotation axis opposite to the fluid flow,

The case side annular seal surface adjacent the case inlet of the case is at least partially formed parallel to the impeller side annular seal surface.
The method of claim 1,

The first angle is 100 degrees to 135 degrees, centrifugal slurry pump.
The method of claim 1,

The width W of the flat portion of the impeller side annular seal surface is between 5 percent and 25 percent of the central inlet diameter D1.
The method of claim 1,

The impeller,

The vane is formed in a vortex radially from the central suction port toward the circumferential direction,

The vane is a centrifugal slurry pump, wherein the shape of the passage cross section through which the fluid passes is circular or elliptical in shape, and the area of the passage cross section increases from the center toward the circumferential direction.
The method of claim 1,

The case is a centrifugal slurry pump, which is an integral case of metal material having an outer surface in contact with the outside air and an inner surface corresponding to the impeller.
The method of claim 1,

An impeller forward and backward device for advancing and retracting the impeller so as to adjust a distance S between the impeller side annular seal surface of the impeller and the case side annular seal surface of the case;

Further comprising, a centrifugal slurry pump.
The method of claim 1,

And the diameter (D2) of the case inlet is larger than the diameter (D1) of the central inlet so that a step (T) can be generated at the case inlet and the central inlet.
A central inlet is formed at one side, and at least one vane is formed therein to forcibly discharge the slurry in the direction of the case outlet by using centrifugal force, and the impeller side annular seal surface adjacent to the central inlet is a fluid flow. Impeller formed to be inclined at an obtuse angle of the first angle relative to the rotation axis in the reverse direction.
The method of claim 8,

The vane is formed in a vortex radially from the central suction port toward the circumferential direction, the shape of the passage cross section through which the fluid passes is circular or elliptical, and the area of the passage cross section increases from the center to the circumferential direction. , Impeller.