KR101540403B1 - Centrifugal Impeller Having External Blade and Pump thereof - Google Patents

Abstract

The present invention relates to an impeller of a centrifugal pump. The impeller of a centrifugal pump according to the present invention comprises: a liquid inflow unit which has two or more plates, and is formed in a direction of a rotational center of the impeller; one or more first blades formed inside the impeller; one or more second blades formed outside the impeller; and one or more balance holes penetrating the inside and the outside of the impeller. Accordingly, a force applied to liquid is increased, and the impeller rotates stably.

Description

[0001] The present invention relates to a centrifugal pump impeller having an external blade and a pump to which the impeller is applied.

The present disclosure relates to an impeller that is applied to a centrifugal pump to supply energy to a fluid, and more particularly to a structure for effectively controlling a force generated by an impeller and a pump to which the impeller is applied.

Here, background art relating to the present disclosure is provided, and they are not necessarily meant to be known arts.

A pump usually refers to a device that moves fluid by mechanical action. The mechanical energy generated in the drive motor is transferred to the fluid by an intermediary such as an impeller. The fluid is sucked into the pump and has higher energy than the atmospheric pressure due to the mechanical energy, and the pump has a structure of discharging the fluid from the low pressure portion to the high pressure portion. The centrifugal pump has a structure in which an impeller having a plurality of curved blades rotates in a closed casing to transmit energy to the fluid by centrifugal force generated by the centrifugal pump. Further, as the energy is transferred to the fluid, the fluid is sucked to the center of the impeller whose pressure is lowered by the centrifugal force, and then flows in the radial direction guided by the impeller blade by the centrifugal force, The fluid leaving the impeller then undergoes the process of over-velocity energy being converted back to pressure energy.

There may be several configurations to increase the performance of these pumps. FIG. 1 discloses a technique for forming a blade on a suction surface of an impeller, which is described in Japanese Patent Application Laid-Open No. 10-1996-0006437. The impeller forms a spiral suction blade on the surface where the fluid is absorbed, thereby separating the suction action from the discharge action and increasing the suction force. However, with this configuration, there are some problems in maximizing the effect of the impeller. By forming additional blades in the impeller, a force not perpendicular to the center of the impeller is additionally applied to the rotary shaft. This also increases the thrust of the impeller, which is a burden on the pump system. This can be a problem with a single-stage pump, but a multi-stage pump can have a severe impact on pump durability by imposing a strain on the overall system. Depending on the size of the pump casing and the position of the impeller, the efficiency and durability of the pump may be further influenced by foreign matter. The present disclosure provides a solution to this problem.

This will be described later in the Specification for Implementation of the Invention.

Here, a general summary of the present disclosure is provided, which should not be construed as limiting the scope of the present disclosure. According to one aspect of the present disclosure, there is provided a centrifugal pump impeller having at least two plates, comprising: a fluid inlet formed in the direction of the rotational center; at least one first blade formed in the impeller; And at least one balance hole passing through the inside and the outside of the impeller.

The impeller includes a plurality of impellers, a rotating shaft of the impeller, a driving unit for supplying a rotating force to the impeller, a suction unit for introducing the fluid into the impeller, and a discharge unit for discharging the fluid compressed by the impeller, An impeller including a fluid inlet formed in the center direction, at least one first blade formed in the impeller, at least one second blade formed in the impeller, and at least one balance hole penetrating the inside and the outside of the impeller, A pump is provided.

This will be described later in the Specification for Enforcement of the Invention.

1 is a view showing an impeller disclosed in Korean Patent Laid-Open Publication No. 10-1996-0006437 as a prior art.
2 is a perspective view of an inlet side of an impeller according to an embodiment of the present disclosure;
3 is a perspective view of an impeller inner blade according to one embodiment of the present disclosure;
4 is an opposite side view of an inlet of an impeller according to one embodiment of the present disclosure;
5 is a front view of an inlet side of an impeller according to an embodiment of the present disclosure;
6 is an illustration of an impeller according to another embodiment of the present disclosure;
7 is a view of a pump coupled to an impeller according to an embodiment of the present disclosure;

Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings.

According to the present disclosure described in Figures 2, 3 and 4, the impeller rotates about an axis of rotation and comprises two or more plates, an inner blade positioned between the plates, an outer blade formed on the outside of the plate, and a balance hole. When the impeller is rotated by the external driving unit, the internal pressure of the impeller is lowered, and the fluid is continuously sucked into the impeller through the fluid inlet 21 of the impeller due to the pressure difference generated at this time.

The fluid inlet 21 is formed in the direction of the rotation axis on the inlet plate 22 of the impeller. The fluid inlet portion 21 is formed with an inlet guide 211 that allows the fluid to stably enter the impeller, increases the stiffness of the impeller, increases the rotation momentum, and stably rotates the impeller. The inlet guide 211 is formed so as to have a predetermined height from the inlet plate surface and has a maximum length in the mounting space when the impeller is installed in the impeller mounting space inside the pump. The shaft support 212 may also extend to form a portion of the fluid inlet 21 with the inlet guide 211. This helps the fluid to be sucked into the impeller stably.

According to Fig. 4, there is one or more inner blades 33 between the plates 22, 32 of the impeller. It is generally curved and has a curvature. The fluid that has flowed in through the fluid inlet portion 21 flows out of the impeller along the inner blade 33 due to the centrifugal force generated by the rotation of the impeller. At this time, the fluid exits to the outside while obtaining the velocity energy through the space between the inner blades 33, and the space between the inner blades 33 becomes a discharge portion of the fluid.

According to Fig. 7, the impeller is located in the impeller compartment in the pump. At this time, a certain space may be generated between the impeller and the wall of the compartment. Additional external blades 31 may be formed in the impeller to maximize utilization of this space to supply energy to the fluid. 3, the outer blade 31 is formed on the outer surface of the additional plate 32 of the impeller, and the height of the outer blade 31 may be equal to or less than the height of the inner blade 33. Since the outer blade 31 is located in a limited space, it is an energy supplying means which is auxiliary to the fluid inside the compartment, so that it is necessary to prevent the load of the inner blade 33 from being applied. In addition, when a plurality of outer blades 31 are attached to the outer surface of the additional plate 32, it is preferable that the interval a of the radial ends thereof is equal to or larger than the interval of the radial ends of the inner blades 33 . On the other hand, although the outer blades 31 and the inner blades 33 may be formed to overlap with each other, it is preferable that the outer blades 31 and the inner blades 33 have a constant interval b without overlapping. As a result, the force generated in the additional plate (32) can be dispersed by the inner blade (33) and the outer blade (31), and the flow of the fluid can be made even. The outer blade 31 may serve to remove impurities that may occur between the outer blade 31 and the inner wall of the impeller compartment.

A balance hole 34 may be formed in a part of the impeller. In the case of an impeller having an outer blade 31, an additional load is applied to the impeller and its rotary shaft. Then, basically, due to the rotation of the impeller, a pressure difference of the fluid in the peripheral space is generated, and an axial force is generated in the impeller, and the thrust is increased due to the additional load described above. This will in some cases affect the durability of the system, particularly the bearing wear of the support shafts. By placing the balance hole 34 between the outer blades 31, this effect can be reduced. These balance holes can be arranged at regular intervals around the axis. It is preferable to be positioned so as to face the fluid inlet 21 and close to the rotation axis. If necessary, the balance holes can be arranged on two different circumferences about the rotation axis. Here again, it is located between the outer blades 31.

The inlet plate 22 may be formed with two layers of different thicknesses. This may be because the resultant force of the additional force generated by the impeller and the thrust generated additionally by the influence of the outer blade 31 is not exactly perpendicular to the rotation axis. Therefore, if the mass of the outer peripheral surface of the plate not including the outer blades 31 is made relatively thick, the rotational moment of inertia can be increased, and as a result, the movement of the impeller during rotation can be made more stable.

In order to make such an impeller, there may be a method of joining the additional plate 32 having the blades 31 and 33 formed on both sides of the inlet plate 22 having the fluid inlet 21 as shown in FIG.

Meanwhile, another embodiment as shown in FIG. 6 may be considered. An auxiliary plate 62 having an external blade formed on a rotatable impeller 61 having at least one external flat surface plate may be joined and manufactured. Although not considered in the drawing, a layer having different thickness and an inlet guide 211 may be formed on the fluid inlet 21 side. Further, a plurality of balance holes may be formed in the impeller 61 and the auxiliary plate 62. [

In Fig. 7, a pump to which the above-described impeller is applied is considered. A multi-stage pump uses two or more impellers to supply energy to the fluid in several stages. A constant force is applied to the rotating shaft by the impeller. An improved impeller according to the present disclosure may be applied in the first step to improve efficiency as the pump requires additional force.

In another embodiment of the multi-stage pump, a single improved impeller may be applied to the second or third stage.

In another embodiment of the multi-stage pump, an improved impeller may be applied to all stages to increase the overall efficiency of the pump.

Various embodiments of the present disclosure will be described below.

(1) A centrifugal pump impeller having at least two plates, comprising: a fluid inlet formed in the rotational center direction; at least one first blade formed inside the impeller; at least one second blade formed outside the impeller; And at least one balance hole penetrating the inside and the outside of the impeller.

(2) A centrifugal pump impeller wherein the balance hole is located between at least one first blade and at least one second blade.

(3) The centrifugal pump impeller as claimed in claim 1, wherein the balance hole is formed in a plate facing the fluid inlet and is located within the area of the regularly projected fluid inlet.

(4) The centrifugal pump impeller as set forth in any one of (1) to (3) above, wherein the balance holes are located on one circumference.

(5) The centrifugal pump impeller as set forth in any one of (1) to (3) above, wherein at least two balance holes are located on at least two or more circumferences about an axis.

(6) A centrifugal pump impeller, wherein the first blade and the second blade have the same curvature.

(7) The centrifugal pump impeller as claimed in any one of the preceding claims, wherein the second blade is formed on a plate surface not facing the fluid inlet, and is lower in height than the first blade.

(8) The centrifugal pump impeller as claimed in claim 1, wherein the second blades are formed on a separate plate and joined together.

(9) The fluid inlet is formed in the inlet plate, the inlet guide formed in the inlet plate, the shaft support formed in the additional plate, and at least two layers different in thickness from the inlet guide are formed in the inlet plate Features a centrifugal pump impeller.

(10) a plurality of impellers, a rotating shaft of the impeller, a driving part for supplying rotational force to the impeller, a suction part for introducing the fluid into the impeller, and a discharge part for discharging the fluid compressed by the impeller, An impeller including at least one first blade formed inside the impeller, at least one second blade formed outside the impeller, and at least one balance hole penetrating the inside and the outside of the impeller, .

21: fluid inflow part 211: inflow guide 212:
22: inlet portion plate 221: bottom portion
31: outer blade 32: additional plate 33: inner blade
34: Balance hole
61: double sided impeller 62: auxiliary plate
71: inlet port 72: outlet port 73-74: impeller

Claims (7)

A centrifugal pump impeller having at least two plates disposed side by side,
A fluid inlet formed in one of the at least two plates and formed in the rotational center direction of the centrifugal pump impeller;
At least one first blade formed inside the centrifugal pump impeller to support two plates disposed side by side;
At least one second blade formed in a plate in which a fluid inflow portion outside the centrifugal pump impeller is not formed; And,
And at least one balance hole located in one of at least two plates penetrating the inside and outside of the centrifugal pump impeller.
The method according to claim 1,
Wherein the balance hole is located between the at least one first blade and the at least one second blade and is formed in a plate facing the fluid inlet and is located within an area of the vertically projected fluid inlet.
The method according to claim 1,
Wherein the balance holes are at least two and are located on at least one circumference and wherein the first blade and the second blade have the same curvature.
The method according to claim 1,
Wherein the second blade is formed on the plate surface not facing the fluid inlet and is lower in height than the first blade.
The method according to claim 1,
And the second blades are formed and joined to separate plates.
The method according to claim 1,
At least two plates,
An inlet plate having a fluid inlet and an inlet guide formed therein; And,
And an additional plate formed with a shaft support portion,
And at least two layers having different thicknesses from the inlet guide are formed in the inlet plate.
A plurality of impellers;
A rotating shaft of the impeller;
A driving unit for supplying rotational force to the impeller;
A suction part for introducing the fluid into the impeller; And,
A discharge unit for discharging the fluid compressed by the impeller; / RTI >
Wherein at least one of the plurality of impellers is the impeller of claim 1.

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