KR20130060778A - Diffuser pump - Google Patents

Abstract

The present invention is coupled to the central axis and the lower side is a radius of the wider and the upper side is a radius of a narrow hub-shaped hub; A diffuser casing formed at an inlet and outlet at which a fluid is introduced and spaced apart from the outer circumferential surface of the hub to form a flow path through which the fluid passes; An impeller provided below the hub to rotate as the fluid passes through the hub; And a back shroud and a front shroud formed in contact with the outer circumferential surface of the hub and the inner circumferential surface of the diffuser casing, the vanes being provided at a predetermined interval and spaced apart from each other. It includes, the vane, is bent in a streamlined shape from the inlet side to the outlet side along the outer peripheral surface of the hub is formed to a lower position than the top of the hub, the inlet side of the fluid inclined at a predetermined angle through the impeller The discharged fluid is inclined at a predetermined angle so that the discharged fluid flows straight, and the upper side, which is the outlet side of the fluid, is vertically inclined at a predetermined angle so as to be vertically formed so that the traveling direction of the introduced fluid is changed in the vertical direction. Provide a diffuser pump.

Description

Diffuser Pump

The present invention relates to a diffuser pump. More specifically, the front shroud is formed longer than the back shroud in order to shorten the overall length of the vane and to smoothly flow the fluid through the impeller to the inlet of the vane, thereby improving the performance of the pump. It is about.

In general, the diffuser pump is a type of vortex (centrifugal) pump, to improve the overall pump efficiency by passing the fluid discharged through the impeller through a fixed guide vane.

Referring to FIG. 7, the conventional diffuser pump 10 has a vane (guide vane) that is almost vertical in the shape of the inlet vane 16 of the guide casing and the length of the front shroud and the back shroud line. It has a shape and a long shape leading to the outlet flange.

The shape of the vane 16 is generally long, so that the fluid passes through the vane for a long time. Accordingly, the vane 16 has a problem in that the vane 16 changes smoothly but does not pass through dynamically.

That is, in the shape of the conventional vane as described above, there is a problem in that the flow of the fluid when it is discharged through the impeller cannot be stably received, thereby slightly reducing the efficiency of the pump.

In addition, there is a problem that the material cost of the vanes increases and the product is large.

In order to solve this problem, the present invention is a vane is bent in a streamlined form from the inlet side to the outlet side along the outer circumferential surface of the hub to a lower position than the top of the hub, the leading edge portion of the fluid inclined at an angle As the trailing edge portion, which is the outlet side of the fluid, is formed vertically, it is more naturally adapted to the rotational direction of the fluid discharged from the impeller side, and the friction decreases as the time for the fluid to pass through the vane reduces the fluid. The aim is to provide a diffuser pump that not only allows for more dynamic and faster passage and discharge, but also increases the overall performance of the pump, efficiency and head.

In addition, the present invention is to shorten the length of the vane is to reduce the manufacturing difficulties, the object of the present invention is to provide a diffuser pump that can reduce the material cost and miniaturization of the pump.

In order to achieve the above object, the present invention is coupled to the central axis and the lower side is a radius of the radius and the upper side is a narrow hub-shaped hub; A diffuser casing formed at an inlet and outlet at which a fluid is introduced and spaced apart from the outer circumferential surface of the hub to form a flow path through which the fluid passes; An impeller provided below the hub to rotate as the fluid passes through the hub; And a back shroud and a front shroud formed in contact with the outer circumferential surface of the hub and the inner circumferential surface of the diffuser casing, the vanes being provided at a predetermined interval and spaced apart from each other. It includes, the vane, is bent in a streamlined shape from the inlet side to the outlet side along the outer peripheral surface of the hub is formed to a lower position than the top of the hub, the inlet side of the fluid inclined at a predetermined angle through the impeller The discharged fluid is inclined at a predetermined angle so that the discharged fluid flows straight, and the upper side, which is the outlet side of the fluid, is vertically inclined at a predetermined angle so as to be vertically formed so that the traveling direction of the introduced fluid is changed in the vertical direction. Provide a diffuser pump.

In addition, the vane includes a first point and a second point where the front shroud and the back shroud, which are both ends of the leading edge on the inlet side of the fluid, meet the inner circumferential surface of the diffuser casing and the outer circumferential surface of the hub. The present invention provides a diffuser pump, wherein the diffuser pump is positioned at a point extending in a downward direction along an inner circumferential surface of the diffuser casing.

In addition, the leading edge is formed by connecting the first point and the second point in a straight line, the inclination with the horizontal axis based on the second point provides a diffuser pump, characterized in that 28 ° ~ 31 °. .

In addition, it provides a diffuser pump, characterized in that formed in a position between 60% to 70% from the lower end to the upper side of the overall height of the hub.

According to the present invention, the vane is bent in a streamlined form from the inlet side to the outlet side along the outer peripheral surface of the hub to a lower position than the top of the hub, the leading edge portion of the fluid inlet side is formed to be inclined at a predetermined angle, The trailing edge part, which is the outlet side of the fluid, is formed vertically, so that it adapts more naturally to the direction of rotation of the fluid discharged from the impeller side, and the friction decreases with the shortening of the time that the fluid passes through the vanes, making the fluid more dynamic. Not only does it pass and discharge more quickly, it also increases the overall performance of the pump, which increases efficiency and head.

In addition, according to the present invention, the length of the vane is formed to be short, reducing manufacturing difficulties, there is an effect that can reduce the material cost and downsize the pump.

1 is a cross-sectional view showing the whole of the diffuser pump according to the present invention,
2 is a cross-sectional view showing a portion of the upper side of the diffuser pump according to the present invention,
Figure 3 is a cross-sectional perspective view showing a part of the upper side of the diffuser pump according to the present invention,
4 is a view showing the vane of the diffuser pump according to the present invention,
5 and 6 are perspective views showing the hub and vanes of the diffuser pump according to the present invention.
7 is a perspective view showing a hub and vanes of a conventional discharger pump.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the constituent elements of the drawings, it is to be noted that the same constituent elements are denoted by the same reference numerals even if they are shown in different drawings. In describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a cross-sectional view showing the whole of the diffuser pump according to the present invention, Figure 2 is a cross-sectional view showing a portion of the upper side of the diffuser pump according to the present invention, Figure 3 is a cross-sectional perspective view showing a portion of the upper side of the diffuser pump according to the present invention. 4 is a view showing the vanes of the diffuser pump according to the present invention, Figures 5 and 6 are perspective views showing the hub and vanes of the diffuser pump according to the present invention.

Diffuser pump 100 according to the present invention includes a hub 120, diffuser casing 140, impeller 160 and vanes 180.

In addition, as illustrated in FIG. 1, the diffuser pump 100 includes a plurality of hubs 120 formed on the central shafts 101 and 101, and an impeller 160 formed below the hub 120. In addition, a diffuser casing 140 is formed outside the hub 120, and a plurality of vanes 180 are formed between the diffuser casing 140 and the hub 120.

That is, the suction port 102 through which the fluid is sucked is formed in the lower side of the diffuser pump 100, and the discharge hole 104 through which the fluid passes through the impeller 160 and the vanes 180 is formed.

Here, the pump is classified into a type installed vertically and horizontally, the diffuser pump 100 of the present invention is a vertical type installed vertically.

In addition, the pump has a volute type and a diffuser (vane 180) type to convert the high-speed fluid from the impeller 160 to a state of high pressure energy, the diffuser pump 100 of the present invention is a diffuser type to be.

That is, the diffuser pump 100 according to the present invention is a vertical type using a diffuser (vane 180), and thus will be described in detail.

2 and 3, the hub 120 is coupled to the central axis 101, the lower side is formed in a jar shape with a wide radius and the upper side is a narrow radius.

In addition, the diffuser casing 140 is formed in the inlet and outlet outlet for the fluid flow is spaced apart from the outer circumferential surface of the hub 120 to form a flow path through which the fluid passes and surrounds the outer circumferential surface of the hub 120.

The impeller 160 is provided below the hub 120 to pass the fluid while rotating.

The vanes 180 are formed with the back shroud 122 and the front shroud 142 contacting the outer circumferential surface of the hub 120 and the inner circumferential surface of the diffuser casing 140, respectively, and are spaced apart at regular intervals.

Here, the vanes 180 are curved in a streamline form from the inlet side to the outlet side along the outer circumferential surface of the hub 120 and are formed to a position lower than the upper end of the hub 120.

Referring to Figure 4, the inlet side of the fluid is inclined at a certain angle so that the fluid discharged inclined at a predetermined angle passing through the impeller 160 is introduced into a straight line (see Fig. 4b).

That is, the vane 180 is the front shroud 142 and the back shroud 122, which is both ends of the leading edge 182 that is the inlet side of the fluid to the inner peripheral surface of the diffuser casing 140 and the outer peripheral surface of the hub 120 The first point P1 and the second point P2 which meet each other are included.

In addition, the first point P1 is located at a point extending in a downward direction along the inner circumferential surface of the diffuser casing 140. Accordingly, the length of the front shroud 142 is formed to be relatively longer than the length of the back shroud 122.

In addition, the leading edge 182 is formed by connecting the first point P1 and the second point P2 in a straight line.

In particular, referring to FIGS. 5 and 6, the leading edge 182 is inclined with the horizontal axis 20 based on the second point P2 (

) Is preferably from 28 ° to 31 °.

That is, the fluid is inclined at a predetermined angle while passing through the rotating impeller 160 is discharged. In this case, when the fluid is inclined at a predetermined angle to maintain the straightness and flows between the vanes 180 and the vanes 180, the fluid may pass and be discharged more quickly.

For reference, FIG. 7 shows a conventional diffuser pump 10. As shown in FIG. 7, the first point P1 and the second point P2, which are conventional leading edges 18, are positioned almost vertically. That is, since the leading edge 18 has a maximum inclination with the vertical axis 10 at a maximum of 3.4 °, when the fluid flows between the vanes 16 and the vanes 16, the lower side of the vanes 16 having the vertical velocity of the fluid is vertical. Is bumped into and reduced.

The upper side, which is the outlet side of the fluid in the diffuser pump 100 according to the present invention, is inclined at a predetermined angle and is formed vertically so that the advancing direction of the introduced fluid is changed in the vertical direction.

Further, the trailing edge 184 is formed at a position between 60% and 70% from the lower end to the upper side of the overall height h of the hub 120 (see FIG. 4A).

That is, the overall length of the vanes 180 of the present invention is shorter than the overall length of the conventional vanes 180, so that friction generated while the fluid passes between the vanes 180 and the vanes 180 is reduced, thereby making it faster and more dynamic. You can pass.

In addition, the entire length of the vane 180 of the present invention is formed to shorten the manufacturing difficulties, it is possible to reduce the material cost and downsize the pump.

On the other hand, the middle portion of the vane 180 is formed in a round, the direction of the fluid passing through the inclined angle is naturally changed in the vertical direction.

The following is an experimental result of measuring the efficiency and head of the diffuser pump 100 according to the present invention.

This experiment was compared by comparing the diffuser pump 100 and the conventional diffuser pump 10 of the present invention.

First, the diffuser pump 100 of the present invention is as described above.

And, the conventional diffuser pump 10, as shown in Figure 7, the leading edge 18 of the vanes 16 is formed vertically, the trailing edge 14 of the vanes 16 is the hub 12 It is formed at the position of the upper end of ().

In other words, this experiment compared the performance (efficiency and head) of the pump changes according to the vane shape of the diffuser pump, and the experiment was performed under the same conditions in addition to the vane shape.

Results according to this experiment are shown in the following [Table 1].

Ht [m] ηt [%] Conventional Diffuser Pump (10) 65.87 92.41 Diffuser pump 100 of the present invention 67.20 94.35

Referring to [Table 1], it can be seen that the result value of the head of the diffuser pump 100 of the present invention is 1.53 [m] higher than that of the conventional diffuser pump 10.

In addition, the diffuser pump 100 of the present invention can be seen that the efficiency is increased by 1.94 [%] than the conventional diffuser pump 10.

Accordingly, the diffuser pump 100 of the present invention has the shape of the vane 180 described above, that is, the front shroud 142 is formed longer than the back shroud 122 so that the end point of the front shroud 142 is increased. The leading edge 182 is tilted about 29 ° with respect to the horizontal axis 20 and is positioned on the inner circumferential surface of the diffuser casing 140, and the position of the trailing edge 184 is at the lower end of the overall height h of the hub 120. By being positioned between 60% and 70% upward, it can be seen that the efficiency and the head are higher than those of the conventional diffuser pump 100.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the same range should be construed as being included in the scope of the present invention.

100: diffuser pump 101: central axis
102: suction port 104: discharge port
120: hub 122: backshroud
140: diffuser casing 142: front shroud
160: impeller 180: vane
182: leading edge 184: trailing edge
P1: first point P2: second point
h: overall height

Claims (4)

A hub of a jar shape coupled to a central axis and having a lower radius and a narrow radius at an upper side thereof;
A diffuser casing formed with an inlet through which the fluid is introduced and an outlet through which the fluid is introduced, and spaced apart from the outer circumferential surface of the hub to form a flow path through which the fluid passes;
An impeller provided under the hub to rotate the fluid; And
A back shroud and a front shroud formed in contact with the outer circumferential surface of the hub and the inner circumferential surface of the diffuser casing, respectively, spaced apart at regular intervals, and provided with a plurality of vanes; / RTI >
The vane is bent in a streamline shape from the inlet side to the outlet side along the outer circumferential surface of the hub and is formed to a position lower than the upper end of the hub, and the inlet side of the fluid is inclined at a predetermined angle through the impeller and discharged from the fluid. Is formed to be inclined at a predetermined angle so as to flow straight, the upper side of the outlet side of the fluid is inclined at a predetermined angle, characterized in that the vertically formed so that the advancing direction of the introduced fluid is changed in the vertical direction.
The method of claim 1, wherein the vane,
The front and back shrouds, which are both ends of the leading edge of the fluid inlet side, include a first point and a second point where the inner circumference of the diffuser casing and the outer circumference of the hub meet each other.
The first point is a diffuser pump, characterized in that located at a point extending a predetermined length in the downward direction along the inner peripheral surface of the diffuser casing.
The method of claim 2, wherein the leading edge,
The first point and the second point is formed in a straight line connected, the diffuser pump, characterized in that the inclination with the horizontal axis based on the second point is 28 ° ~ 31 °.
The method of claim 1, wherein the trailing edge,
Diffuser pump, characterized in that formed in a position between 60% to 70% from the lower end to the upper side of the overall height of the hub.

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