KR20210151476A - Rotor cover and pitot pump with blade-shaped flow channel - Google Patents

Abstract

The present invention provides a rotor cover and a pitot pump to which blade shaped flow channels are applied, capable of alleviating a flow instability phenomenon such as flow separation and secondary flow of a fluid by forming the flow channels of the rotor cover, which are paths through which the fluid flows from the rotor cover into a rotor, in a curved blade shape bent in the same direction. To this end, the present invention provides the rotor cover and the pitot pump to which the blade shaped flow channels are applied, comprising: the rotor having a fluid accommodating unit accommodating the fluid therein, and rotationally driven to rotate the fluid introduced therein; the rotor cover coupled to the rotor to rotate in the same direction, and introducing a fluid into the fluid accommodation unit; a rotor case disposed on the outside in a shape surrounding the rotor and the rotor cover; a manifold coupled to the rotor case to form a flow path through which the fluid is introduced from the fluid accommodating unit and discharged; and a pitot tube having one part disposed inside the fluid accommodating unit and the other part coupled to the manifold such that the fluid discharged from the inside of the fluid accommodating unit moves, wherein the rotor cover includes a plurality of flow channel channels formed in a curved blade shape bent in the same direction.

Description

Rotor cover and pitot pump with blade-shaped flow channel

The present invention relates to a rotor cover and a pitot pump to which a blade-shaped flow channel is applied, and more particularly, to a curved blade shape in which the flow channel of the rotor cover, which is a path through which fluid flowing into the rotor from the rotor cover moves, is bent in the same direction. It relates to a rotor cover and a pitot pump to which a blade-shaped flow channel is applied, which can alleviate flow instability such as fluid flow separation and secondary flow by being formed as

In general, a pump serves to pressurize a liquid and transport it to a higher position, and there are largely a reciprocating type and a rotating type as a method of applying pressure, of which the rotary type pump is a method that is pressurized by rotation using a motor. .

In general, an impeller is used to pressurize through rotation, but in a pitot tube pump, the rotor rotates and pressurizes, and the liquid is discharged through the pitot tube in a stationary state.

That is, as the rotor rotates, the fluid flows into and out of the rotor, and at this time, the flow instability is caused in the flow path depending on the shape of the flow path through which the fluid is supplied to the inside of the rotor.

For example, flow separation and secondary flow may occur due to the recirculation region, and this flow instability phenomenon causes vibration of the structure and deterioration of performance.

Republic of Korea Patent Publication No. 10-1987-0005188 (Title of the invention: Pitow tube for a Pitow type centrifugal pump, published on: June 5, 1987)

The problem to be solved in the present invention is that the flow channel of the rotor cover, which is the path through which the fluid flowing into the rotor from the rotor cover moves, is formed in the shape of a curved blade that is bent in the same direction, so that the flow of fluid such as flow separation and secondary flow is reduced. An object of the present invention is to provide a rotor cover and a pitot pump to which a blade-shaped flow channel capable of alleviating instability is applied.

In order to solve the above problems, in the present invention, in a rotor cover mounted on a pump, a cover body formed in a disk shape, an inlet portion formed in the center of one surface of the cover body, and a fluid flowing in from the outside; There is provided a rotor cover to which a blade-shaped flow channel is applied, which extends from the inlet to an edge region of the other surface of the cover body and includes a plurality of flow channels formed in a radial blade shape.

In addition, the present invention is a pitot pump equipped with a rotor cover to which a blade-shaped flow channel according to the present invention is applied, a fluid accommodating part for accommodating a fluid is formed therein, and the fluid introduced therein from the rotor cover is rotated. A rotating rotor, a rotor case disposed on the outside in a shape surrounding the rotor and the rotor cover, and a manifold coupled to the rotor case to form a flow path through which fluid is introduced and discharged from the fluid receiving part, a part of It is disposed inside the fluid accommodating part, and the other part is coupled to the manifold to provide a pitot pump to which a blade-shaped flow channel is applied, characterized in that it includes a pitot tube through which the fluid discharged from the inside of the fluid accommodating part moves.

Here, it may further include a rotation driving unit coupled to the rotor to rotate the rotor.

In addition, the rotor cover is formed in the center of the other surface of the cover body, further comprising a pitot tube coupling portion connected to the inlet, the diameter of the pitot tube coupling portion is formed smaller than the diameter of the inlet portion, the pitot tube coupling The other part of the pitot tube may be coupled to the part.

In addition, the pitot tube coupling portion may be formed to be stepped in a step shape, and a region of the other portion of the pitot tube coupled to the pitot tube coupling portion may be formed to be stepped in a step shape to correspond to the shape of the pitot tube coupling portion.

In addition, the manifold has a fluid supply passage connected to the inlet for supplying the fluid to the inlet, and a fluid discharge passage connected to the other part of the pitot tube to discharge the fluid discharged from the pitot tube to the outside. may include

The rotor cover and the pitot pump to which the blade-shaped flow channel according to the present invention is applied have the following effects.

First, since the flow channel of the rotor cover for introducing the fluid into the rotor is formed in the shape of a curved blade that is bent in the same direction, there is an advantage in that flow instability such as flow separation and secondary flow of the fluid can be alleviated.

Second, there is an advantage in that it is possible to prevent the deterioration of the performance of the pump and the vibration of the device in which the pump is mounted by alleviating the unstable phenomena of the flow such as flow separation and secondary flow of the fluid.

1 is a view showing a first embodiment of a rotor cover to which a blade-shaped flow channel according to the present invention is applied.
2 is a view showing a second embodiment of a rotor cover to which a blade-shaped flow channel according to the present invention is applied.
3 is a view showing a third embodiment of a rotor cover to which a blade-shaped flow channel according to the present invention is applied.
4 is a view showing a pitot pump to which a blade-shaped flow channel according to the present invention is applied.
5 is a diagram illustrating a conceptual diagram for calculating a velocity triangle of a flow flowing into a rotor.
6 is a view showing the results of CFD analysis of the flow channel inside the flow channel of the rotor cover and the pitot pump to which the conventional flow channel and the blade-shaped flow channel according to the present invention are applied.
7 is a view showing the results of CFD analysis of the voltage distribution inside the flow channel of the rotor cover and the pitot pump to which the conventional flow channel and the blade-shaped flow channel according to the present invention are applied.

Hereinafter, preferred embodiments of the present invention in which the above-described problems to be solved can be specifically realized will be described with reference to the accompanying drawings. In describing the present embodiments, the same names and the same reference numerals are used for the same components, and an additional description thereof will be omitted below.

A rotor cover and a pitot pump to which the blade-shaped flow channel according to the present invention is applied will be described with reference to FIGS. 1 to 7 .

First, a first embodiment of a rotor cover to which a blade-shaped flow channel according to the present invention is applied will be described with reference to FIG. 1 .

The rotor cover to which the blade-shaped flow channel according to the present invention is applied includes a cover body 100 , an inlet 200 , a flow channel 300 , and an outlet 500 .

The cover body 100 is formed in a disk shape and is coupled to a rotor 2000 to be described later.

The inlet 200 is formed in the center of one surface of the cover body 100 , that is, opposite to the surface coupled to the rotor 2000 , and the fluid flows in from the outside.

The flow channel 300 is formed in the shape of a curved blade extending in the direction of the edge region of the other surface of the cover body 100 from the inlet 200 and bent in the same direction, and is configured in plurality.

The discharge part 500 is formed on the edge of the other surface of the cover body, that is, the surface coupled to the rotor 2000, is formed in a square shape (see FIGS. 6 (c) and (d)), and the flow path The fluid moving along the channel 300 is discharged to the rotor 2000 .

That is, the fluid flows in from the inlet 200 and moves along the flow channel 300 , and the fluid moves toward the rotor 2000 through the outlet 500 .

In addition, as shown in (c) and (d) of Figure 6, the flow channel is formed in a semicircular shape, so that the movement of the fluid is prevented from being blocked or collided with the flow channel.

Alternatively, a second embodiment of the rotor cover to which the blade-shaped flow channel according to the present invention is applied will be described with reference to FIG. 2 .

The second embodiment of the rotor cover to which the blade-shaped flow channel according to the present invention shown in FIG. 2 is applied is, as described in the first embodiment, the cover body 100 , the inlet 200 , and the flow channel 300 . ) and the contents including the discharge unit 500a are the same.

However, in the second embodiment of the rotor cover to which the blade-shaped flow channel according to the present invention is applied, the discharge part 500a is configured in plurality.

That is, as shown in FIG. 2 , the fluid moving through the flow channel 300 is simultaneously discharged to the plurality of discharge units 500a and moves to the rotor 2000 to rotate the rotor 2000 . The flow rate of the fluid supplied to the rotor 2000 may be adjusted without controlling the rotation speed of the driving unit ( 6000 in FIG. 4 ).

Here, the discharge unit 500a may be composed of two parts 510a and 520a as shown in FIG. 2 , or may be composed of two or more according to the target value of the flow rate.

In addition, the plurality of discharge units 500a may have the same area or may have different areas based on a target flow velocity.

Alternatively, a third embodiment of the rotor cover to which the blade-shaped flow channel according to the present invention is applied will be described with reference to FIG. 3 .

The seventh embodiment of the rotor cover to which the blade-shaped flow channel according to the present invention shown in FIG. 3 is applied is, as described in the first embodiment, the cover body 100 , the inlet 200 , and the flow channel 300 . ) and the contents including the discharge unit 500b are the same.

However, in the third embodiment of the rotor cover to which the blade-shaped flow channel according to the present invention is applied, the discharge part 500b is formed in a rectangular shape.

That is, compared with the discharge part 500 formed in a square shape in the first embodiment of the rotor cover to which the blade-shaped flow channel according to the present invention is applied, the longitudinal direction of the flow channel 300 and It is formed to extend correspondingly, for example, the discharge part 500b may be formed in a rectangular shape, and accordingly, the flow rate of the fluid supplied to the rotor 2000 may be adjusted.

As described above, the flow channel 300 of the rotor cover to which the blade-shaped flow channel according to the present invention is applied will be described in detail in the pitot pump to which the blade-shaped flow channel according to the present invention is applied, which will be described later.

The configuration of the pitot pump to which the blade-shaped flow channel according to the present invention is applied will be described with reference to FIGS. 1 to 7 .

The pitot pump to which the blade-shaped flow channel according to the present invention is applied will be described with reference to the first embodiment ( FIG. 1 ) of the rotor cover to which the aforementioned blade-shaped flow channel is applied.

First, as shown in FIGS. 1 and 4, the pitot pump to which the blade-shaped flow channel according to the present invention is applied has a rotor 2000 and a rotor cover 1000 (rotor cover to which the blade-shaped flow channel according to the present invention is applied as described above). ), a rotor case 3000 , a manifold 4000 and a pitot tube 5000 .

The rotor 2000 is disposed inside the rotor case 3000 , a fluid accommodating part 2100 in which a fluid is accommodated is formed therein, and power is transmitted from the rotation driving part 6000 interlocked with the rotor 2000 . It receives and rotates to rotate the fluid flowing in from the rotor cover 1000 , that is, the fluid accommodated in the fluid accommodating part 2100 .

That is, as the rotor 2000 rotates, the fluid accommodated in the fluid accommodating part 2100 rotates and the fluid flows into and out of the fluid accommodating part 2100, thereby performing a pumping action.

At this time, according to the shape of the flow channel 300 that supplies the fluid to the fluid receiving part 2100 , that is, the flow channel 300 formed in the rotor cover 1000 , the flow is unstable, such as flow separation and secondary flow. phenomenon will occur.

In order to prevent this, the present invention designs the flow channel 300 formed in the rotor cover 1000 by applying the velocity triangle of the fluid flow flowing into the rotor 2000 .

That is, by designing in consideration of the rotational force of the rotor 2000 and the rotor cover 1000 and the inertia of the fluid flow, the flow can flow stably.

As shown in FIG. 5 , the respective speeds, speed components, relative speeds, and angles at the inlet and outlet of the flow channel 300 according to the rotational speed of the rotor 2000 are calculated.

First, the tangential speed U at the inlet and outlet of the flow channel 300 according to the rotational speed of the rotor 2000 is calculated through Equation 1 .

Here, ω is the angular velocity of the rotor 2000, and r is the radius at the inlet and outlet of the flow channel 300 with respect to the rotation axis.

Also, U ₁ is a tangential velocity at the inlet of the flow channel 300 , and U ₂ is a tangential velocity at the exit of the flow channel 300 .

_{Thereafter, the axial and radial velocity components V x} at the inlet and outlet of the flow channel 300 are calculated through Equation 2 . In this case, Equation 2 corresponds only to the case of incompressible flow.

Here, Q is the flow rate of the fluid moving through the flow channel 300 , and A is the cross-sectional area of the inlet and outlet of the flow channel 300 .

In addition, V _x1 denotes the value of the inlet of the flow channel 300 , and V _x2 denotes the value of the exit of the flow channel 300 .

_{The relative velocity W 1} at the inlet of the flow channel 300 is calculated through Equation 3 using the above-described U and V _{x .}

In addition, the angle β _{1 with respect to the relative velocity W 1} at the entrance of the flow channel 300 at this time is calculated through Equation (4).

Since the inflow flow at the inlet of the flow channel 300 is not affected by the rotation of the rotor 2000, it can be assumed that the inflow flow of the flow channel 300 is equal to the axial velocity component as _{V 1} =V _x1. have.

However, since the influence of the rotation of the rotor 2000 is reflected in _{V 2 , which} is the flow at the outlet of the flow channel 300 , a tangential velocity component exists.

_{V θ2, which} is a tangential velocity component at the outlet, is calculated through Equation 5 using the pressure ratio Δp in the rotor 2000.

_{In addition, the relative speed W 2} at the exit of the flow channel 300 is calculated through Equation 6 as follows.

_{In addition, the angle β 2} of the exit of the flow channel 300 with respect to the relative speed W _{2 at the exit of the flow channel 300 is calculated through Equation 7 .}

_{As a result, by applying β 1} and β ₂ through the above-described process, the flow channel 300 is designed to have a curved blade shape bent in the same direction, and flow separation occurring inside the flow channel 300, Secondary flow can be prevented.

That is, by designing the shape of the flow channel, it is possible to increase the existing reverse pressure gradient, prevent the flow from becoming unstable by causing a pressure imbalance, and reduce the phenomenon of reducing the cross-sectional area of the flow path. Since the loss of output can be minimized, the performance of the pump can be improved.

In addition, the rotor cover 1000 further includes a pitot tube coupling part 400 .

The pitot tube coupling part 400 is formed in the center of the other surface of the cover body 100, is connected to the inlet part 200, and the other part area of the pitot tube 5000, which will be described later, penetrates through the pitot tube ( 5000) is combined with

At this time, the pitot tube coupling part 400 is formed to have a step shape in a step shape, and an area of the other part of the pitot tube 5000 coupled to the pitot tube coupling part 400 is of the pitot tube coupling part 400 . It is formed stepwise in a step shape to correspond to the shape.

In addition, the diameter of the Pitot tube coupling portion 400 is formed to be smaller than the diameter of the inlet portion (200). That is, when the fluid flows from the inlet 200 into the flow channel 300 , the fluid flows through the inner side of the inlet 200 and the surface formed on the outer side of the Pitot tube 5000 . It flows into the flow channel 300 .

That is, the pitot tube coupling part 400 and the pitot tube 5000 are coupled to seal the coupling part, so that the fluid flowing in from the inflow part 200 does not move to the pitot tube coupling part 400 and without loss. The flow channel 300 is movable.

The rotor case 3000 has a shape surrounding the rotor 2000 and the rotor cover 1000 , and the rotor case 3000 is disposed outside the rotor 2000 and maintains a stationary state.

The manifold 4000 is coupled to the rotor case 3000 to form a flow path through which a fluid is introduced and discharged from the fluid accommodating part 2100 .

Specifically, the manifold 4000 includes a fluid supply passage 4100 and a fluid discharge passage 4200 .

The fluid supply passage 4100 supplies the fluid to the inlet 200 so that the fluid moves to the fluid receiving part 2100 .

The fluid discharge passage 4200 is connected to the end region of the other part of the Pitot tube 5000, and moves from an end of a part of the Pitot tube 5000 to discharge the fluid discharged to the outside of the fluid receiving unit 2100. .

A part of the Pitot tube 5000 is disposed inside the fluid accommodating part 2100 , and the other part is connected to the fluid discharge passage 4200 of the manifold 4000 and discharged from the inside of the fluid accommodating part 2100 . fluid is moving

Next, with reference to FIGS. 6 and 7 , the results of CFD analysis of the flow path inside the flow channel 300 in the conventional flow channel 300 and the rotor cover to which the blade-shaped flow channel according to the present invention is applied and the pitot pump are shown. The explanation is as follows.

As shown in FIGS. 6 and 7 , in the conventional flow channel 300 , an outlet from an inlet of the flow channel 300 is formed in a straight line shape.

First, (a) and (b) of Figure 6 is a view showing the result of CFD analysis of the flow line inside the conventional flow channel 300, (c) and (d) of Figure 6 (c) and (d) is a blade according to the present invention It is a view showing the results of CFD analysis of the flow channel 300 of the rotor cover to which the shape flow channel is applied and the flow channel 300 of the pitot pump.

All of the flow channels 300 in FIG. 6 rotate clockwise, and the flow flowing into the inlet 200 (the inlet of the flow channel 300) goes out in the radial direction (the outlet of the flow channel 300). I'm going.

As shown in (a) and (b) of Figure 6, in the conventional flow channel 300, flow separation occurs at the inlet, and it can be seen that the flow flows to the pressure side.

In addition, it can be confirmed that the secondary flow occurs at the inlet of the flow channel 300 and thus the flow is unstable.

On the other hand, as shown in (c) and (d) of Figure 6, in the flow channel 300 of the pitot pump and the rotor cover to which the blade-shaped flow channel according to the present invention is applied, flow separation or secondary flow according to the movement of the fluid It can be seen that this does not occur and shows a stable flow.

In addition, FIG. 7 (a) is a diagram showing the result of CFD analysis of the voltage distribution inside the conventional flow channel 300, and FIG. 7 (b) is a rotor cover to which a blade-shaped flow channel according to the present invention is applied. And it is a diagram showing the result of CFD analysis of the voltage distribution inside the flow channel 300 of the pitot pump.

As shown in (a) of Figure 7, the maximum voltage inside the conventional flow channel 300 is 44.4 bar, as shown in Figure 7 (b), the blade-shaped flow channel according to the present invention The maximum voltage inside the applied rotor cover and the flow channel 300 of the pitot pump is interpreted as 47.0 bar.

That is, the maximum voltage inside the flow channel 300 of the rotor cover and the pitot pump to which the blade-shaped flow channel according to the present invention is applied based on the same rotational force compared to the maximum voltage inside the conventional flow channel 300 is about It rose by 6%.

This is a result of reduced losses due to the existing flow separation and secondary flow.

As described above, the present invention is not limited to the specific preferred embodiments described above, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. are possible and such modifications are within the scope of the present invention.

1000: rotor cover
100: cover body
200: inlet
300: Euro Channel
400: Pitot tube coupling part
500, 500a, 510a, 520a, 500b: outlet
2000: rotor
2100: fluid receiver
3000: rotor case
4000: Manifold
4100: fluid supply path
4200: fluid discharge path
5000: phyto tube
6000: rotation drive unit

Claims (6)

In the rotor cover mounted on the pump,
Cover body formed in a disk shape;
an inlet portion formed in the center of one surface of the cover body and through which a fluid is introduced from the outside; and
A rotor cover to which a blade-shaped flow channel is applied, including a plurality of flow channels extending from the inlet to an edge region of the other surface of the cover body and formed in a curved blade shape that is bent in the same direction. In the pitot pump equipped with the rotor cover according to claim 1,
a rotor having a fluid receiving portion accommodating the fluid therein and rotatingly driven to rotate the fluid introduced therein from the rotor cover;
a rotor case disposed outside in a shape surrounding the rotor and the rotor cover;
a manifold coupled to the rotor case and having a flow path through which fluid is introduced and discharged from the fluid receiving part; and
A pitot pump to which a blade-shaped flow channel is applied, comprising: a pitot tube having a part disposed inside the fluid accommodating part, and a pitot tube coupled to the manifold and the fluid discharged from the inside of the fluid accommodating part moves. 3. The method of claim 2,
A pitot pump to which a blade-shaped flow channel is applied, characterized in that it further comprises; a rotation driving unit coupled to the rotor to rotate the rotor. 3. The method of claim 2,
The rotor cover is formed in the center of the other surface of the cover body, further comprising a Pitot tube coupling portion connected to the inlet,
The diameter of the Pitot tube coupling portion is formed smaller than the diameter of the inlet portion,
A pitot pump to which a blade-shaped flow channel is applied, characterized in that the other part of the pitot tube is coupled to the pitot tube coupling part. 5. The method of claim 4,
The Pitot tube coupling portion is formed to be stepped in a step shape,
A pitot pump to which a blade-shaped flow channel is applied, characterized in that an area of the other part of the pitot tube coupled to the pitot tube coupling part is formed to be stepped in a step shape to correspond to the shape of the pitot tube coupling part. 3. The method of claim 2,
The manifold is
a fluid supply passage connected to the inlet for supplying a fluid to the inlet; and
A pitot pump to which a blade-shaped flow channel is applied, comprising a; a fluid discharge passage connected to the other part of the pitot tube and discharging the fluid discharged from the pitot tube to the outside.

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