KR101826819B1 - Centrifugal slurry pump and impeller - Google Patents

Abstract

The present invention relates to a centrifugal slurry pump and an impeller for pumping a fluid in a form of slurry. The centrifugal slurry pump comprises: a case having a housing space formed therein, a case inlet formed on one side thereof, and a case outlet formed on the other side thereof; and an impeller disposed in the housing space of the case so as to be rotated by a motor, having a central suction port formed on one side so that slurry is sucked through the case inlet, and at least one vane formed therein so that the slurry is forced to be discharged in a direction of the case outlet by centrifugal force. An impeller-side annular seal surface adjacent to the central suction port of the impeller is formed to be inclined at a first obtuse angle with respect to a rotation axis which is a reverse direction of a fluid flow, and at least a portion of a case-side annular seal surface adjacent to the case inlet of the case may be formed parallel to the impeller-side annular seal surface.

Description

Centrifugal slurry pump and impeller < RTI ID = 0.0 >

The present invention relates to a centrifugal slurry pump and an impeller, and more particularly, to a centrifugal slurry pump and an impeller for pumping a fluid in the form of a slurry.

Generally, a centrifugal pump is a device which can rotate a fluid using an impeller installed inside a case and pump the fluid by a centrifugal force. The impeller is composed of a plurality of vanes formed in a radial vortex shape, There is no serious problem in transferring the material. However, when transferring a highly dense fluid having a very high density, such as a dense oil, a wastewater slurry, a suspension, a concentrate or a mixture thereof, Pressure portion is inevitably caused to evaporate moisture contained in the slurry to generate air bubbles or voids. When such air bubbles or voids are generated in a large amount, the impeller is idle and the conveying efficiency is greatly reduced , Even when such bubbles or voids are collapsed, Explosion explosion occurred inside the pump, causing serious damage to the inside of the centrifugal pump, abrasion between parts, durability of various parts such as case and impeller, and so on.

The conventional centrifugal slurry pump disclosed in Korean Patent No. 10-0225027 has a case-side annular sealing surface F1 formed on the case and an impeller-side annular sealing surface F2 on the impeller so as to be parallel to the case- Side annular sealing surface F1 and the impeller-side annular sealing surface F2 are inclined at a second angle Q that is an acute angle smaller than an angle of 90 degrees with respect to a rotational axis of the fluid flowing in a direction opposite to the fluid flow .

Such a 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 dotted arrows in the direction of the flow of the main fluid V1 Side annular sealing surface F2 is concealed from the flow of the fluid by using the sealing surfaces F1 and F2 which are obliquely inclined in the direction to be combined with the flows V1 and V2 of the main fluid so that the mechanical friction of the impeller In order to minimize the size of the system.

However, such a conventional centrifugal slurry pump may reduce the mechanical friction of the impeller, but as shown in Fig. 7, the velocity of the rotating impeller-side fluid flow V2 is fixed to the flow V1 and the flow between the case side annular seal surface F1 and the impeller side annular seal surface F2 accelerates the speed of the impeller side fluid flow V2 more quickly and the flow rate of the impeller- Pressure portion is formed and bubbles or voids are generated due to the occurrence of such a low-pressure portion, the boundary is broken inside the centrifugal slurry pump according to the atmospheric pressure, so that explosion phenomenon in which bubbles or voids are exploded occurs severely, And the durability of various parts such as the case, the impeller, and the like is greatly lowered.

In addition, since the durability of the impeller and the case deteriorates, it is necessary to frequently replace the impeller, and the case needs to be separately provided with an outer case made of a metal material and an inner case made of a replaceable rubber material. The manufacturing cost is increased due to the complicated structure, and there are many problems such that the operation cost and the management cost are increased due to the replacement of the parts.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to solve the above problems, and it is an object of the present invention to provide a gas turbine engine in which an annular seal surface on the case side and an annular seal surface on the impeller side are inclined with respect to a rotational axis, It is possible to prevent the occurrence of bubbles and voids, thereby preventing damage, wear and durability of the centrifugal slurry pump due to the explosion of air bubbles and voids, By precisely controlling the flow of fluid between the seal surface and the annular seal surface on the impeller side, it is possible to maximize the pumping efficiency with optimum conditions according to the type of slurry, the specification and the use environment, A centrifugal slurry pump and an impeller to reduce the manufacturing cost, operating cost and management cost of the product And to provide the above-mentioned objects. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided a centrifugal slurry pump, comprising: a case having a housing space formed therein, a case inlet formed at one side thereof, and a case outlet formed at the other side; And a central intake port formed at one side of the case so as to be able to suck the slurry through the case inlet, wherein the centrifugal force is applied to the slurry in the direction of the case outlet, Wherein the impeller-side annular sealing surface adjacent to the central suction port of the impeller has an obtuse angle with respect to the axis of rotation, which is opposite to the flow direction of the fluid, And the case-side annular seal surface adjacent to the case inlet of the case may be formed at least partially in parallel with the impeller-side annular seal surface.

Further, according to the present invention, the first angle may be from 100 degrees to 135 degrees.

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

According to the present invention, the impeller is provided with the vane radially inwardly in a radial direction from the central intake port toward the circumferential direction, and the vane has a circular cross section or a elliptical cross section through which the fluid passes, The area of the passage cross-section can be widened from the center toward the circumferential direction.

Further, according to the present invention, the case may be an integral case made of a metal material having an outer surface in contact with the outside air and an inner surface corresponding to the impeller.

The centrifugal slurry pump according to the present invention is characterized in that the centrifugal slurry pump according to the present invention further comprises an impeller forward / rearward which advances / retracts the impeller so as to adjust a gap S between the impeller- Device. ≪ / RTI >

According to the present invention, the diameter D1 of the case inlet may be smaller than the diameter D2 of the central inlet so that a step T may be generated in the case inlet and the center inlet.

According to an aspect of the present invention, there is provided an impeller having a central inlet formed at one side thereof and at least one vane formed therein for forcibly discharging the slurry toward the case outlet by centrifugal force, , The impeller-side annular seal surface adjacent to the central suction port may be formed to be inclined at a first obtuse angle with respect to the rotational axis of the fluid flow in the opposite direction.

According to the present invention, the vane is formed in a spiral radial shape on the inner side from the central suction port in the circumferential direction, and the shape of the passage cross section through which the fluid passes is circular or elliptical, It can be widened in the circumferential direction.

According to some embodiments of the present invention as described above, it is possible to prevent the occurrence of bubbles and voids by preventing the occurrence of low-pressure portions, thereby preventing damage, wear and durability of the centrifugal slurry pump due to the explosion phenomenon of bubbles or voids It is possible to precisely control the flow of the fluid between the case side annular seal surface and the impeller side annular seal surface by using the step so that the pumping efficiency can be optimized in accordance with the type of slurry, And the manufacturing cost, the operating cost, and the management cost of the product can be reduced 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 illustrating a centrifugal slurry pump in accordance with some embodiments of the present invention.
2 is a rear perspective view of the centrifugal slurry pump of FIG.
3 is an exploded perspective view of the centrifugal slurry pump of FIG. 1;
4 is a partial cut-away sectional view of the centrifugal slurry pump of FIG.
Fig. 5 is an enlarged cross-sectional view showing an enlarged view of part B of the centrifugal slurry pump of Fig. 4;
6 is an enlarged cross-sectional view of a centrifugal slurry pump in accordance with some other embodiments of the present invention.
7 is an enlarged sectional view showing a conventional centrifugal slurry pump.
8 is a front perspective view illustrating an impeller according to some embodiments of the present invention.
Fig. 9 is a rear perspective view showing the impeller of Fig. 8; Fig.
10 is a front sectional view showing the impeller of FIG.
11 is a side sectional view showing the impeller of Fig.

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

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It will be appreciated that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, 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 elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures the elements are turned over so that the elements depicted as being on the top surface of the other elements are oriented on the bottom surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect 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" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing 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, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is a front perspective view showing a centrifugal slurry pump 100 according to some embodiments of the present invention, FIG. 2 is a rear perspective view showing a centrifugal slurry pump 100 of FIG. 1, and FIG. 3 is a cross- FIG. 4 is a partially cutaway cross-sectional view showing the centrifugal slurry pump 100 of FIG. 1, and FIG. 5 is an enlarged cross-sectional view of the centrifugal slurry pump 100 of FIG. Sectional view.

1 to 5, a centrifugal slurry pump 100 according to some embodiments of the present invention includes a frame 10, a casing 20, and an impeller 30 have.

For example, as shown in FIGS. 1 to 5, the frame 10 is installed on the floor to support the load of the case 20 and the impeller 30, and 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 of various shapes into fasteners.

However, the frame 10 is not limited to the drawings, and various types of various frame structures capable of supporting the case 20 and the impeller 30 can be applied.

1 to 5, the case 20 is fixed to one side of the frame 10, and an accommodation space for accommodating the impeller 30 therein is formed therein A case inlet 20a formed on one side, and a case outlet 20b formed on the other side.

More specifically, for example, the case 20 may be an integral case made of a metal having an outer surface in contact with the outside air and an inner surface corresponding to the impeller 30.

As described above, the case 20 can reduce the generation of bubbles and voids in the conventional art by the angle of the annular seal surface, which will be described later, so that the wear rate of the component can be lowered. The need for a replaceable inner case is eliminated, which can greatly reduce the operating and maintenance costs of the pump.

1 to 5, the impeller 30 is installed in the accommodating space of the case 20 so as to be rotatable by a motor M installed in the frame 10 A central suction port 30a is formed on one side of the casing inlet 20a so as to allow the slurry to be sucked through the casing inlet port 20a and a centrifugal force is applied to the inside of the casing outlet 20b for forced discharge of the slurry toward the casing outlet 20b. And may be a kind of rotary vane structure in which at least one vane 30b is formed.

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

The annular seal face F2 on the impeller side is inclined at an obtuse angle K with respect to the rotational axis L which is opposite to the flow direction of the fluid, At least a part of which is formed parallel to the impeller-side annular sealing surface (F2) and can be formed to be inclined at substantially the same angle as the first angle (K).

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

That is, if the first angle K is too large, the manufacturing and assembling of parts becomes cumbersome. If the first angle K is too small, the effect of bubbles and voids is lowered, so that appropriate values can be selected and applied.

5, the first angle K is defined between the case-side annular sealing surface F1 and the impeller-side annular sealing surface F2, as indicated by the dotted arrows in the flow of the main fluid. It is possible to minimize the formation of the low-pressure portion theoretically or experimentally if the gap S between the case-side annular sealing faces F1 of the case 20 can be minimized.

Here, the gap S between the case-side annular sealing faces F1 of the case 20 can be minimized by using the impeller forward / backward device 40 to be described later, and the occurrence of the low- It is possible to prevent the occurrence of pores and thereby to prevent damage, wear and durability deterioration of the centrifugal slurry pump due to explosion of air bubbles or pores.

Further, when the gap S between the case side annular sealing faces F1 of the case 20 is minimized, the airtightness 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 sealing face F2 is 5 to 25% of the diameter D2 of the central inlet 30a so that sufficient sealing can be achieved through repeated experiments and simulations. Percent.

However, the present invention is not limited to such numerical values, and the width of the sealing surface can be varied in various diametric ratios depending on the kind of slurry, the specifications of the pump, the operating environment or the conditions.

1 to 4, the impeller forward / backward device 40 includes an impeller-side annular sealing surface F2 of the impeller 30, It is possible to adjust the gap S between the annular sealing faces F1 and the diverging seal faces F1 in a wide variety of devices that can move the impeller 30. [

For example, as shown in FIGS. 1 and 2, a forward / backward adjusting screw installed on the frame 10 and capable of pressing the impeller 30 may be installed. However, the present invention is not limited to the drawings, and a screw rod or a guide rod whose position can be automatically adjusted by the motor can be used.

In addition, a very wide variety of position adjusting screws may be additionally provided to maintain the rotational trajectory of the impeller 30 constant so that the impeller 30 is not oscillated when the impeller 30 is rotated.

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

6, the centrifugal slurry pump 100 according to some other embodiments of the present invention includes a casing inlet 20a and a central inlet 30a, The diameter D1 of the suction port 20a may be smaller than the diameter D2 of the central suction port 30a.

Therefore, the flow of the main fluid passes through the impeller-side annular sealing surface F2 of the impeller 30 and the case-side annular sealing surface F2 of the case 20, as indicated by the dotted arrow by the step T, RTI ID = 0.0 > F1. ≪ / RTI >

That is, in the absence of the step T, the probability that the main flow will be branched between the impeller side annular sealing surface F2 of the impeller 30 and the case side annular sealing surface F1 of the case 20 Side annular sealing surface F1 on which the inlet between the impeller-side annular sealing surface F2 and the case-side annular sealing surface F1 is relatively protruded Side annular sealing surface F2 and the case-side annular sealing surface F1 can be minimized.

However, if the step (T) is too large, a low-pressure portion can be generated. Therefore, the step (T) can be optimally designed in accordance with the kind of slurry, the specification of the pump, the operating environment, and the like.

That is, the flow of the fluid between the case-side annular sealing surface F1 and the impeller-side annular sealing surface F2 is precisely controlled by using the step T so that the kind of the slurry, Therefore, the optimum pumping efficiency can be maximized.

8 is a front perspective view showing an impeller 30 according to some embodiments of the present invention, Fig. 9 is a rear perspective view showing the impeller 30 of Fig. 8, and Fig. 10 is a front perspective view showing an impeller 30 of Fig. 11 is a side sectional view showing the impeller 30 of Fig. 8. Fig.

3 to 11, the impeller 30 has a vane 30b formed radially inwardly from the central intake port 30a in a circumferential direction, and the vane 30b Can be formed in such a shape that the shape of the passage cross section A1 or A2 through which the fluid passes is circular or elliptical and the area of the passage cross sections A1 and A2 widens from the center toward the circumferential direction .

Accordingly, since the shape of the passage cross-sections A1 and A2 through which the fluid passes is circular or elliptical, the angular corners that cause energy loss on the inner side are minimized, thereby maximizing the efficiency of the impeller 30. [

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

The vane 30b is formed inside the vane 30a in a radial direction from the central suction port 30a in the circumferential direction. The passage cross section A1 or A2 through which the fluid passes is circular or elliptical, The area of the passage cross-sections A1 and A2 can be widened from the center toward the circumferential direction.

Therefore, according to the centrifugal slurry pump 100 and the impeller 30 of the present invention, the generation of bubbles and voids can be prevented by preventing the occurrence of low-pressure portions, and as a result, the centrifugal slurry pump 100 It is possible to precisely control the flow of fluid between the annular seal surface on the case side and the annular seal surface on the side of the impeller to precisely control the flow of the fluid by means of the step so that it is optimum for the type of slurry, The pumping efficiency can be maximized and the manufacturing cost, operating cost and management cost of the product can be reduced by using a single case.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: frame
20: Case
20a: Case inlet
20b: Case outlet
30: Impeller
30a: Central intake
30b: Vane
M: Motor
F1: Case side annular seal face
F2: Impeller side annular seal face
L: rotation axis line
K: 1st angle
A: Low pressure area
W: Width
D1, D2: Diameter
A1, A2: Cross section
T: step
100: Centrifugal slurry pump

Claims (9)

A case having a housing space formed therein, a case inlet formed at one side thereof, and a case outlet formed at the other side thereof; And
A central intake port is formed at one side of the casing so that the slurry can be sucked through the casing inlet port, and the slurry is forced in the direction of the casing outlet using a centrifugal force And an impeller in which at least one vane is formed 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 a first obtuse angle with respect to a rotation axis of the fluid flow in the opposite direction,
The case-side annular seal surface adjacent to the case inlet of the case is formed at least partially in parallel with the impeller-side annular seal surface,
An upper extension line of the cross-section of the case suction port and an upper side of the cross-section of the central suction port are formed parallel to each other,
Wherein a diameter of the casing inlet is smaller than a diameter of the central inlet so that a step can be generated in the casing inlet and the central inlet. The method according to claim 1,
Wherein the first angle is between 100 degrees and 135 degrees. The method according to claim 1,
And the width W of the flat portion of the impeller-side annular seal surface is 5 to 25 percent of the central inlet diameter D1. The method according to claim 1,
The impeller
Wherein the vane is formed in a radial shape in a radial direction from the central suction port to the inner side,
Wherein the vane has a circular cross section or a elliptical cross section through which the fluid passes and the area of the cross section is widened from the center toward the circumferential direction. The method according to claim 1,
Wherein the case is an integral case made of a metal material having an outer surface in contact with the outside air and an inner surface corresponding to the impeller. The method according to claim 1,
An impeller forward / backward device for advancing / retreating the impeller so as to adjust a gap (S) between the impeller-side annular sealing surface of the impeller and the case-side annular sealing surface of the case;
Further comprising a centrifugal slurry pump. delete delete delete

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