KR101861288B1 - Vibration reduction type single channel pump and its design method - Google Patents

Abstract

The present invention relates to a vibration reduction type single flow path pump and a method of designing the same. More particularly, the present invention relates to a vibration reduction type single flow path pump for reducing vibrations caused by a fluid force while maintaining efficiency, and a method of designing the same. According to the present invention, there is provided a valve apparatus comprising: a varactor casing in which a flow path space through which a fluid can pass is formed in a circumferential direction; An impeller rotatably coupled to the inside of the varute casing for inflow and discharge of a fluid; A measuring unit for measuring a fluid force generated in accordance with a flow of the fluid passing through the impeller; And a vibration reduction unit which generates an energy corresponding to the fluid force in a reaction direction of the fluid force, wherein the vibration reduction unit reduces the dynamic vibration due to the fluid force according to the energy generation of the vibration reduction unit A single flow pump is provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a vibration reduction type single-flow pump and a method of designing the same. [0002] VIBRATION REDUCTION TYPE SINGLE CHANNEL PUMP AND ITS DESIGN METHOD [

The present invention relates to a vibration reduction type single flow path pump and a method of designing the same. More particularly, the present invention relates to a vibration reduction type single flow path pump for reducing vibrations caused by a fluid force while maintaining efficiency, and a method of designing the same.

Generally, a wastewater pump is a pump that transports sewage and wastewater sludge, and is widely used in various industrial fields.

Since the wastewater pump needs to move the fluid including the foreign matter, unlike a general underwater pump, flow clogging frequently occurs. As described above, the flow path clogging may reduce the performance of the wastewater pump, such as the lift efficiency, or may cause failure or breakage of the wastewater pump. Therefore, it is important to design the wastewater pump so that clogging does not occur.

1 is an illustration showing the interior of a conventional vortex pump and a single flow path pump.

Figure 1 (a) is a vortex pump. The vortex pump is designed to prevent clogging of a flow path of a wastewater pump to which an impeller having a plurality of flow paths has been applied. The vortex pump prevents the clogging of the flow path by shortening the length of the impeller and ensuring a wide flow path. However, the vortex pump has a problem in that the length of the impeller is shortened and the lift efficiency is only about 30% as compared with the conventional wastewater pump.

1 (b) is a single-flow pump. The single flow path pump forms one flow path inside the impeller, and the flow path rotates together with the rotation of the impeller to transfer the wastewater. The single channel pump thus prepared has a merit that the flushing efficiency is more than twice as high as that of the vortex pump without causing clogging of the flow passage. However, since the impeller of the single-flow pump has an asymmetric structure unlike a general impeller, there is a problem that the distribution of the fluid force is not constant when the single-flow pump is operated,

Therefore, in order to use the single channel pump, the vibration must be reduced. In general, the vibrations generated in the pump include static vibration and dynamic vibration. The static vibration can be reduced by a method of controlling the center of gravity by mounting a dummy on the impeller of the single flow path pump.

However, in order to reduce the dynamic vibration, dynamic vibration is a vibration caused by the fluid force generated by the fluid flow. In order to reduce the dynamic vibration, the fluid flow is analyzed according to the size of the single flow path pump, And time is required.

Also, in the case of a single flow path pump, since the efficiency and the vibration are generally proportional to each other, there is a problem that if the shape of the single flow path pump is changed in order to lower the vibration of the single flow path pump, the efficiency of the single flow path pump also decreases.

Therefore, there is a need for a technique capable of reducing vibration while maintaining the efficiency of a single flow path pump.

U.S. Patent No. 6837684 (Apr. 1, 2005)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a vibration reduction type single flow path pump for reducing vibrations caused by a fluid force while maintaining efficiency, and a method of designing the same.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, there is provided a fuel cell system including: a volute casing having a flow path space through which a fluid can pass, the fuel cell being extended in a circumferential direction; An impeller rotatably coupled to the inside of the varute casing for inflow and discharge of a fluid; A measuring unit for measuring a fluid force generated in accordance with a flow of the fluid passing through the impeller; And a vibration reduction unit which generates an energy corresponding to the fluid force in a reaction direction of the fluid force, wherein the vibration reduction unit reduces the dynamic vibration due to the fluid force according to the energy generation of the vibration reduction unit A single flow pump is provided.

In the embodiment of the present invention, the vibration reduction unit is provided in the varactor casing, and is provided at a position corresponding to a reaction direction with respect to the fluid force resultant measured by the measurement unit.

In an embodiment of the present invention, the magnitude and direction of the fluid force may be derived through an unsteady flow analysis.

In an embodiment of the present invention, the vibration reduction unit may be a magnetic body having a magnetic force corresponding to a magnitude of a fluid force acting on the impeller.

In the embodiment of the present invention, the varactor casing and the impeller may be mutually supported by a plurality of packing members and wear ring members.

In the embodiment of the present invention, the vibration reduction unit may be provided on the packing member and the wearer member positioned in the reaction direction of the fluid force.

In order to accomplish the above object, the present invention provides a water treatment apparatus using a vibration reduction type single flow pump.

According to an aspect of the present invention, there is provided a method of manufacturing a single-flow pump, comprising the steps of: a) preparing a single flow pump having a varactor casing and an impeller; b) measuring a fluid force generated in accordance with a flow of the fluid passing through the impeller; And c) disposing a vibration reduction section in the varactor casing that generates energy corresponding to the fluid force in the reaction direction of the fluid force resultant, wherein in the step c), in the energy generation of the vibration reduction section So that the dynamic vibration due to the fluid force is attenuated.

In an embodiment of the present invention, the step b) may be performed through an unsteady flow analysis.

In the embodiment of the present invention, in the step (c), the vibration reduction unit may be provided in the varactor casing and at a position corresponding to the reaction direction with respect to the fluid force resultant measured by the measurement unit have.

In the embodiment of the present invention, in the step (c), the vibration reduction unit may be a magnetic body having a magnetic force corresponding to a magnitude of a fluid force acting on the impeller.

In the embodiment of the present invention, in the step a), the varactor casing and the impeller may be mutually supported by a plurality of packing members and a wear ring member.

In the embodiment of the present invention, in the step c), the vibration reduction unit may be provided on the packing member and the wearer member positioned in the reaction direction of the fluid force.

The effect of the present invention according to the above configuration is that since the shape of the vibration reduction type single flow path pump is not changed, the vibration can be effectively reduced while maintaining the efficiency.

Further, according to the present invention, it is easy to apply to a single flow pump which has already been manufactured and used in the field.

Further, according to the present invention, there is no possibility that the flow path clogging phenomenon occurs and the vibration is reduced, so that the possibility of occurrence of breakdown and breakage of the vibration reducing type single flow path pump is reduced and the replacement period is also long.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is an illustration showing the interior of a conventional vortex pump and a single flow path pump.
2 is a schematic view showing the inside of a vibration reduction type single flow path pump according to an embodiment of the present invention.
3 is a view illustrating an impeller of a vibration reduction type single flow path pump according to an embodiment of the present invention.
4 is a distribution diagram of the fluid force generated during the rotation of one wheel of the single flow path pump.
5 is a view showing an internal flow path shape of an impeller and a volute casing for explaining an unsteady flow analysis of a vibration reduction type single flow path pump according to an embodiment of the present invention.
6 is a view illustrating an installation position of a vibration reduction unit of a vibration reduction type single flow path pump according to an embodiment of the present invention.
7 is a schematic view schematically showing the inside of a vibration reduction type single flow path pump according to an embodiment of the present invention.
8 is a pressure distribution diagram of a general single-flow pump according to an unsteady flow analysis.
9 is a pressure distribution diagram of a vibration reduction type single flow path pump according to an embodiment of the present invention.
10 is a pressure distribution diagram of a general single channel pump of the present invention and a vibration reduction single channel pump according to an embodiment of the present invention.
FIG. 11 is an ISO-surface diagram of a flow rate of a general single flow path pump according to an embodiment of the present invention and a vibration reduction type single flow path pump according to an embodiment.
12 is a flowchart of a method of designing a vibration reduction type single flow path pump according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

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

FIG. 2 is a schematic view showing the inside of a vibration reduction type single flow path pump according to an embodiment of the present invention, and FIG. 3 is a view illustrating an impeller of a vibration reduction type single flow path pump according to an embodiment of the present invention.

As shown in FIGS. 2 and 3, the vibration-reduced single flow path pump 100 includes a varactor casing 110 and an impeller 120.

The flow volume of the volute casing (110) through which the fluid can pass is formed in the circumferential direction. Specifically, the flow passage through which the fluid can pass may be formed in a spiral manner in the circumferential direction, and an outlet through which the fluid can be introduced and discharged may be formed in the varute casing 110.

The impeller 120 is rotatably coupled to the inside of the varute casing 110 for inflow and discharge of fluids. Specifically, the impeller 120 may be installed at the center of the inner circumference of the varute casing 110, and the impeller 120 may be formed in a generally cylindrical shape and curved. Although not shown, the impeller 120 may be connected to a driving shaft (not shown) connected to a motor (not shown) and may be rotatable by the power of the motor. The impeller 120 can flow the centrifugal force of the fluid flowing at the time of rotation.

The varactor casing 110 and the impeller 120 may be mutually supported by a plurality of packing members and a wear ring member. In the vibration reduction type single flow path pump 100, the flow path is not clogged by the foreign substances included in the wastewater. Therefore, the vibration reducing type single flow path pump 100 does not suffer from deterioration in performance such as lifting efficiency caused by flow path clogging, failure or breakage.

The vibration reduction type single flow path pump 100 further includes a measurement unit (not shown) for measuring a fluid force generated according to a flow of the fluid passing through the impeller 120. The measuring unit can measure and derive the fluid force and the direction of action through the unsteady flow analysis. More specifically, the abnormal flow analysis method will be described with reference to the following drawings.

4 is a distribution diagram of the fluid force generated during the rotation of one wheel of the single flow path pump.

4 shows the distribution of the fluid force measured with the inlet of the volute casing 110 as the origin. The fluid force resulting from the flow of the unsteady fluid can be calculated by the following equation (1).

In Equation (1), A _s denotes a fluid force distribution region, and a distribution region of the fluid force can be calculated by the following Equation (2).

In Equation (1), D _s means the distance from the origin to the center of mass of the fluid distribution region, and can be calculated by the following equation (3).

Here, C _x and C _y are the x-axis coordinate and the y-axis coordinate of the mass center point of the fluid force distribution region, respectively, and C _x and C _y can be calculated through the following equations (4) and have.

The measuring unit can measure and derive the fluid force and the direction of action through the unsteady flow analysis method. However, the method of measuring and deriving the resultant force and the direction of action of the measuring unit is not limited to one embodiment.

5 is a view illustrating an internal flow path shape of an impeller and a volute casing for explaining an unsteady flow analysis of a vibration reduction type single flow path pump according to an embodiment of the present invention.

As shown in FIG. 5, the internal flow path cross-sectional area of the impeller and the varute casing can be analyzed by dividing the flow path cross-sectional area for each section, thereby analyzing the flow of the fluid according to time and section.

FIG. 6 is a view illustrating an installation position of a vibration reduction unit of a vibration reduction type single flow path pump according to an embodiment of the present invention, and FIG. 7 is a schematic view showing the inside of a vibration reduction type single flow path pump according to an embodiment of the present invention. Fig.

As shown in FIGS. 6 and 7, the vibration reduction type single flow path pump 100 is provided with the vibration reduction unit 130 so as to reduce the vibration due to the pressure distribution concentrated on one side.

Specifically, the vibration reduction unit 130 generates energy corresponding to the magnitude of the fluid force acting on the impeller 120 in the reaction direction of the fluid force, thereby generating the energy of the vibration reduction unit 130 And may be configured to attenuate the dynamic vibration due to the fluid force according to the following equation. Specifically, the vibration reduction unit 130 is provided in the varactor casing 110, and is provided at a position corresponding to a reaction direction with respect to the fluid force resultant measured by the measurement unit.

The magnitude and direction of the fluid force resultant is derived by the metering section through the unsteady flow analysis, as described above. Specifically, the magnitude of the fluid force resultant is derived from the fluid force distribution area measured at the inlet (origin) of the varute casing 110 on the basis of the rotation of the impeller 120 once, And the distance between the center of gravity C and the origin O of the force distribution region can be calculated. And, as the area of the oil force distribution area increases, and as the distance from the center point (C) to the origin (O) of the oil force distribution area increases, the total fluid force resultant increases. On the contrary, as the area of the oil force distribution area becomes narrower and the distance from the center point (C) to the origin (O) of the oil force distribution area decreases, the hydraulic force resultant decreases. At this time, as the distance from the center point (C) to the origin (O) of the oil force distribution region becomes closer, the dynamic vibration caused by the oil force is attenuated.

Accordingly, the vibration reduction unit 130 receives the magnitude of the unsteady fluid force resulting from the unsteady flow analysis and the direction of action of the fluid force from the metering unit, and determines the direction of reaction force of the fluid force acting on the impeller 120 The center point C of the oil force distribution region of the impeller 120 can be moved to be adjacent to the origin O. [ As an example, the center point C of the fluid force distribution region shown in Fig. 6 is located in the fourth quadrant. Therefore, the action direction of the fluid force is a direction indicated by a solid arrow, and the vibration reduction unit 130 is provided at a position corresponding to a direction indicated by an arrow indicated by a dotted line in a second quadrant, which is a reaction direction of the fluid force . The vibration reduction unit 130 applies an energy corresponding to the magnitude of the fluid force to the impeller 120 so that the center point C of the fluid force distribution region acting on the impeller 120 is the origin O. [ As shown in Fig.

In one embodiment, the vibration reduction unit 130 may be a magnetic body having a magnetic force corresponding to the magnitude of the fluid force acting on the impeller 120. The vibration reduction unit 130, which is a magnetic body having a magnetic force corresponding to the magnitude of the fluid force acting on the impeller 120, may be located in a reaction direction of the fluid force acting on the impeller 120. A force is generated between the vibration reduction unit 130 and the impeller 120. The center of the oil force distribution region of the impeller 120 is shifted by the magnetic force in the direction in which the vibration reduction unit 130 is located . Since the magnetic force of the vibration reduction unit 130 made of a magnetic material is provided corresponding to the magnitude of the fluid force, the center of the fluid force distribution region is located at the same position as the origin O. Therefore, the dynamic vibration generated due to unbalance of the fluid force can be reduced in the vibration reduction type single flow path pump 100.

The vibration reduction unit 130 may be provided on the packing member and the wearer member, which are provided for mutually supporting and coupling the varactor casing 110 and the impeller 120. Particularly, it is preferable that the vibration reduction unit 130 is provided on the packing member and the wearer member positioned in the reaction direction of the fluid force. However, the position of the vibration reduction unit 130 is not limited to that provided in the packing member and the wearer member, and it is possible to reduce the energy corresponding to the magnitude of the fluid force acting on the impeller to the direction of reaction force of the fluid force The present invention is not limited thereto. For example, the vibration reduction unit 130 may be provided on the outer surface of the varute casing 110.

The position of the vibration reduction section 130 shown in FIG. 7 is only shown for possible positions, and the vibration reduction section 130 is not limited to the positions shown in the drawings. The position where the vibration reduction unit 130 is provided may be such that the vibration reduction unit 130 is located only in the direction of the reaction force.

FIG. 8 is a pressure distribution diagram of a general single-flow pump according to an unsteady flow analysis, and FIG. 9 is a pressure distribution diagram of a vibration-reduced single-flow pump according to an embodiment of the present invention.

8 and 9 show the distribution of the pressure generated during the rotation of the impeller 120 by one rotation. In the general single-flow pump of FIG. 8, since the impeller is asymmetric, the pressure distribution due to the dynamic vibration It can be seen that it occurs in one side. Therefore, the general single-flow-path pump generates a large vibration and increases the possibility of failure and breakage.

On the other hand, as shown in FIG. 9, it can be seen that the vibration reduction type single flow path pump 100 is attenuated by the dynamic vibration, so that the pressure distribution is formed more uniformly than a general single flow path pump.

10 is a pressure distribution diagram of a general single channel pump of the present invention and a vibration reduction single channel pump according to an embodiment of the present invention.

10 (a) is a pressure distribution of a general single-flow pump, and FIG. 10 (b) is a pressure distribution of the vibration-reduced single-flow pump 100. FIG. As shown in FIG. 10, the vibration reduction type single flow path pump 100 has a low overall pressure and a uniform pressure distribution as compared with a general single flow path pump.

FIG. 11 is an ISO-surface diagram of a flow rate of a general single flow path pump according to an embodiment of the present invention and a vibration reduction type single flow path pump according to an embodiment of the present invention.

11 is an isometric view of the flow rate when a fluid passes through a single single flow path pump 100 and a vibration reduction type single flow path pump 100 at a speed of 1.5 m / s. 11 (a) is a general single-flow pump, and Fig. 11 (b) is a vibration-reduced single-flow pump 100. Fig. As can be seen from FIG. 11, it can be seen that the flow rate is uniformly formed in the internal flow path of the vibration reduction type single flow path pump 100 as compared with a general single flow path pump.

8 to 11, it can be seen that the vibration reducing type single flow path pump 100 has a uniform flow force as compared with a general single flow path pump, and therefore, the vibration reducing type single flow path pump 100 It can be seen that the dynamic vibration is significantly attenuated.

The vibration reduction type single flow path pump 100 provided as described above is applicable to a wastewater treatment apparatus for treating wastewater or the like.

12 is a flowchart of a method of designing a vibration reduction type single flow path pump according to an embodiment of the present invention.

Hereinafter, a method of designing the vibration reduction type single flow path pump 100 will be described with reference to FIG.

First, the method of designing the vibration reduction type single flow path pump 100 includes a step S210 of preparing a single flow path pump in which the varactor casing 110 and the impeller 120 are combined. In the step S210 of preparing a single flow path pump in which the varactor casing 110 and the impeller 120 are combined, the varactor casing 110 and the impeller 120 are separated from each other by a plurality of packing members and wearer members May be mutually supportably coupled.

Measuring a fluid force generated in accordance with a flow of fluid passing through the inside of the impeller 120 after the step S210 of preparing a single flow path pump in which the varactor casing 110 and the impeller 120 are combined S220) can be performed. In the step S220 of measuring the fluid force generated according to the flow of the fluid passing through the inside of the impeller 120, the fluid force is measured through the unsteady flow analysis. In particular, the magnitude and direction of the fluid force are calculated Lt; / RTI > As described above, the unsteady flow analysis for deriving the magnitude and the acting direction of the fluid force resulting from the flow of the fluid passing through the inside of the impeller 120 can be programmed. The program is designed to automatically derive the magnitude and the acting direction of the fluid force acting on the impeller 120 when a predetermined parameter for the shape of the volute casing 110 and the impeller 120 is input .

[0031] After the step S220 of measuring the fluid force generated in accordance with the flow of the fluid passing through the impeller 120, an energy corresponding to the fluid force is generated in the reaction direction of the fluid force, (S230) of arranging the honeycomb 130 in the varactor casing 110 can be performed.

In the step S230 of placing the vibration reduction unit 130 in the varactor casing 110 that generates the energy corresponding to the fluid force in the direction of reaction of the fluid force, the vibration reduction unit 130 And is provided at the position corresponding to the reaction direction of the fluid force acting on the impeller 120, which is provided in the varute casing 110. The dynamic vibration due to the fluid force can be attenuated according to the generation of the energy of the vibration reduction unit 130.

In the step S230 of placing the vibration reduction unit 130 in the varactor casing 110 that generates the energy corresponding to the fluid force in the reaction direction of the fluid force, the vibration reduction unit 130 May be a magnetic body having a magnetic force corresponding to a magnitude of a fluid force acting on the impeller 120. The vibration reduction unit 130 provided as a magnetic body may be positioned in a reaction direction of the fluid force acting on the impeller 120. The vibration reduction unit 130 provided as a magnetic body pulls the center point C of the oil force distribution region acting on the impeller 120 through the magnetic force to the origin O to generate the vibration reduction type single flow path pump 100 Can be attenuated.

In the step S230 of placing the vibration reduction unit 130 in the varactor casing 110 that generates the energy corresponding to the fluid force in the reaction direction of the fluid force, the vibration reduction unit 130 May be provided on the packing member and the wearer member positioned in the reaction direction of the fluid force. However, the position of the vibration reduction unit 130 is not limited to that of the embodiment, and the position of the vibration reduction unit 130 may be set such that the energy corresponding to the fluid force acting on the impeller 120 is reflected by the reaction Direction are all included in one embodiment.

Since the vibration reduction type single flow path pump 100 provided as described above does not change the shape of the varute casing 110 and the impeller 120, the vibration can be effectively reduced while maintaining the performance such as the lift efficiency .

In addition, the vibration reduction type single flow path pump 100 can be easily applied by installing the vibration reduction unit 130 on a single flow pump which is already manufactured and used in the field. That is, it is economical to reduce the vibration without replacing the existing single-flow pump.

In addition, since the vibration reduction type single flow path pump 100 does not cause clogging of the flow path and vibration is effectively reduced, there is less possibility of breakdown and failure of the vibration reduction type single flow path pump, The replacement period of the pump 100 is also long, which is economical.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: Vibration-reduced single-flow pump
110: Vulutite casing
120: Impeller
130: Vibration reduction part

Claims (13)

A volute casing in which a flow passage through which the fluid can pass extends in the circumferential direction;
An impeller rotatably coupled to the inside of the varute casing for inflow and discharge of a fluid;
A measuring unit for measuring a fluid force generated in accordance with a flow of the fluid passing through the impeller; And
And a vibration reduction unit for generating energy corresponding to the fluid force in a reaction direction of the fluid force,
Wherein the dynamic vibration due to the fluid force is attenuated according to the generation of energy in the vibration reduction section. The method according to claim 1,
Wherein the vibration reduction unit is provided in the varactor casing and is provided at a position corresponding to a reaction direction with respect to a fluid force resultant measured by the measurement unit. The method according to claim 1,
Wherein the magnitude and direction of the fluid force resultant is derived through an unsteady flow analysis. The method according to claim 1,
Wherein the vibration reduction portion is a magnetic body having a magnetic force corresponding to a magnitude of a fluid force acting on the impeller. The method according to claim 1,
Wherein said varactor casing and said impeller are mutually supported by a plurality of packing members and a wear ring member. 6. The method of claim 5,
Wherein the vibration reducing section is provided on the packing member and the wearer member positioned in the reaction direction of the fluid force. A wastewater treatment apparatus using the vibration reduction type single flow pump according to any one of claims 1 to 6. comprising the steps of: a) preparing a single flow pump in which the varactor casing and the impeller are combined;
b) measuring a fluid force generated in accordance with a flow of the fluid passing through the impeller; And
and c) disposing, in the varactor casing, a vibration reduction portion that generates energy corresponding to the fluid force result in a reaction direction of the fluid force,
Wherein the dynamic vibration due to the fluid force is attenuated in accordance with the generation of energy in the vibration reduction unit in the step c). 9. The method of claim 8,
Wherein the step b) is performed through an unsteady flow analysis. 9. The method of claim 8,
Wherein the vibration reduction unit is provided in the varactor casing at a position corresponding to a reaction direction with respect to a fluid force resultant measured by the measuring unit in the step c). 9. The method of claim 8,
Wherein the vibration reduction unit is a magnetic body having a magnetic force corresponding to a magnitude of a fluid force acting on the impeller in the step c). 9. The method of claim 8,
Wherein in the step a), the varactor casing and the impeller are mutually supported by a plurality of packing members and a wear ring member. 13. The method of claim 12,
Wherein the vibration reduction unit is provided in the packing member and the wearer member positioned in a reaction direction of the fluid force resultant in the step c).

Images