KR20220012642A - Ejector - Google Patents

Abstract

The present invention relates to an ejector. More specifically, the present invention relates to the ejector which reduces an accumulated flow rate of a fluid by increasing a separation distance of a suction hole along the axial direction of a suction pipe. The ejector of the present invention comprises: a body; and the suction pipe.

Description

ejector {EJECTOR}

The present invention relates to an ejector, and more particularly, to an ejector in which a separation distance of a suction hole is increased along an axial direction of a suction pipe to reduce a cumulative flow rate of a fluid.

In general, an ejector is a type of jet pump and is a device that generates a physical suction force using negative pressure generated by Bernoulli's principle when a fluid such as air, water, or steam under pressure passes through a nozzle.

These ejectors are used for various purposes such as transport, discharge, and exhaust of raw materials, suction removal such as dust collection, negative pressure generation such as degassing, spray spraying, solid-liquid or gas-liquid mixing, etc. It is used in a wide range of facilities.

In particular, the ejector has a large limitation on the suction object due to the risk of damage to the rotating vehicle, the increase in installation cost is large due to the increase in capacity, the maintenance cost is high due to the wear of the rotating vehicle, etc., and the suction efficiency compared to input energy is low. Compared with the pump of , it is widely used because it can suction even solid or highly viscous objects, has low installation and maintenance costs, and has high suction efficiency compared to input energy.

In a conventional ejector, a suction hole is formed on a surface of a suction pipe through which a high-pressure fluid is introduced and a suction pressure is formed. In this case, the suction holes may be formed to be spaced apart from each other at regular intervals along the circumference and the longitudinal direction of the suction pipe.

Accordingly, in the suction pipe, the amount of the fluid introduced into the suction pipe and the suction fluid sucked through the suction hole is accumulated and increased along the flow direction of the fluid. The rate of damage to the inner wall of the suction pipe is proportional to the flow rate of the fluid. That is, in the conventional ejector, the damage rate increases along the flow direction of the fluid, and a problem of equipment damage occurs during long-term operation.

In this regard, it is necessary to study the ejector structure that reduces the damage rate of the inner wall.

European Patent No. 0211685

The present invention has been devised to solve the above problems, and an object of the present invention is to increase the separation distance of the suction hole along the axial direction of the suction pipe to reduce the accumulated flow rate of the fluid, and to reduce the damage rate of the inner wall surface of the suction pipe to provide an ejector.

The ejector according to an embodiment of the present invention includes: a body provided with a fluid receiving part in which a first fluid introduced through a fluid inlet pipe formed on one side is accommodated; and a suction pipe inserted into the body and into which a second fluid is introduced to generate suction pressure, wherein the suction pipe has a plurality of suction holes formed along the circumference and the axial direction, and the suction hole is located in the axial direction. Accordingly, it is characterized in that the distance increases from one side to the other side.

In one embodiment, it is characterized in that the interval between the suction holes formed along the circumference of the suction pipe along the second fluid flow direction is increased.

In one embodiment, the gap between the suction holes formed on one side and the other side along the axial direction of the suction pipe is characterized in that the difference is 35% or more.

In one embodiment, when a plurality of lines are formed in the suction hole along the axial direction of the suction pipe, it is characterized in that it is divided into three zones.

In one embodiment, the suction hole, characterized in that formed in a portion of the surface of the suction pipe.

In one embodiment, it characterized in that it further comprises a; discharge pipe portion positioned in a hollow tube shape along the longitudinal direction in communication with one end of the suction pipe.

In one embodiment, the inner diameter is expanded, the extension portion located at the other end of the discharge pipe; characterized in that it further comprises.

In one embodiment, the discharge pipe portion, characterized in that the diameter is smaller than that of the suction pipe.

In one embodiment, it is located between the end of the body and the suction pipe to which the suction pipe is introduced, a sealing part for preventing the first fluid from leaking to the outside of the body; characterized in that it further comprises.

In one embodiment, it is characterized in that the first fluid is sucked into the suction pipe through the suction hole.

According to the present invention, the separation distance of the suction hole is increased along the axial direction of the suction pipe to reduce the accumulated flow rate of the fluid, and the damage rate to the inner wall surface of the suction pipe is reduced.

1 is a perspective view of an ejector according to an embodiment of the present invention.
2 is a cross-sectional view of an ejector according to an embodiment of the present invention.
3 is a side view of a suction pipe according to an embodiment of the present invention.
4 is a cross-sectional view of an ejector according to another embodiment of the present invention.

The present invention will be described in detail with reference to the accompanying drawings as follows. Here, repeated descriptions and detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted. The embodiments of the present invention are provided in order to completely explain the present invention to those of ordinary skill in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clearer description.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

Hereinafter, preferred examples are presented to help the understanding of the present invention. However, the following examples are only provided to more easily understand the present invention, and the content of the present invention is not limited by the examples.

1 is a perspective view of an ejector 100 according to the present invention, and FIG. 2 is a cross-sectional view of the ejector 100 according to the present invention.

The ejector 100 according to the present invention includes a body 10 and a suction pipe 20 .

The body 10 has a fluid inlet pipe 11 formed on one side, the inside is hollow, and both ends are opened so that a suction pipe 20 to be described later can be inserted. The end of the body 10 into which the suction pipe 20 is inserted may have an opening diameter corresponding to the outer diameter of the suction pipe 20 . In addition, the body 10 may further include a sealing part (not shown) between the opening inner wall and the suction pipe 20 formed at the end. The sealing part may prevent the first fluid introduced through the fluid inlet pipe 11 from leaking to the outside of the fluid accommodating part 12 .

Although the fluid inlet pipe 11 has an angle provided to the body 10 of 90°, the angle provided in the body 10 is not limited thereto.

The body 10 is provided with a fluid accommodating part 12, the fluid accommodating part 12 can accommodate the fluid introduced through the fluid inlet pipe 11 between the suction pipe 20 and the inner wall. Accordingly, the fluid accommodating part 12 may communicate with the fluid inlet pipe 11 , and the diameter of the fluid accommodating part 12 is larger than the outer diameter of the suction pipe 20 .

The fluid inlet pipe 11 may be formed to be spaced apart from the center line of the body 10 by a predetermined distance. That is, the center of the fluid inlet pipe 11 is spaced apart from the center line of the body 10 by a predetermined distance. Therefore, the first fluid flowing into the fluid inlet pipe 11 flows into the fluid receiving part 12 in a tangential direction with respect to the suction pipe 20 installed in the center of the body 10 , so that it does not collide with the suction pipe 20 .

3 is a side view of the suction pipe 20 according to an embodiment of the present invention.

The suction pipe 20 is inserted into the body 10, and the second fluid is introduced to generate suction pressure. The suction pipe 20 is installed in the center of the body 10 in the longitudinal direction of the body 10 . Accordingly, the length of the suction pipe 20 may correspond to the length of the body 10 . In addition, the suction pipe 20 may be formed in a tube shape having both ends open and a hollow inside in order to induce a flow of the second fluid from one side to the other. In the suction pipe 20, the second fluid may be introduced to one end, and the mixed fluid may be discharged to the other end of the corresponding position.

The suction pipe 20 has a plurality of suction holes 21 formed on some surfaces thereof. The suction hole 21 is a passage through which the first fluid introduced into the fluid inlet pipe 11 formed on one side of the body 10 is sucked into the suction pipe 20 . In other words, the first fluid may be sucked into the suction pipe 20 through the suction hole 21 by the suction pressure formed inside the suction pipe 20 . Accordingly, the suction pipe 20 may mix the first and second fluids in the portion where the suction hole 21 is formed.

In addition, the suction hole 21 is formed along the circumference and the axial direction of the suction pipe 20 , and the suction hole 21 increases in distance from one side to the other side along the axial direction of the suction pipe 20 .

That is, the suction hole 21 is formed at a predetermined distance from each other along the circumference of the suction pipe 20 . At this time, the suction hole 21 is formed on the same line with respect to the radial direction of the suction pipe 20 . In addition, the suction hole 21 is formed in a plurality of lines along the axial direction of the suction pipe 20 . A line is a unit meaning a plurality of suction holes 21 formed on the same line in the radial direction of the suction pipe 20 . A plurality of lines are formed to be spaced apart from each other.

In the suction pipe 20, the interval between the suction holes 21 formed along the circumference of the suction pipe 20 along the second fluid flow direction is increased. In other words, in the ejector 100 according to the present invention, the interval between the plurality of suction holes 21 included in the line is increased along the second fluid flow of the suction pipe 20 .

In addition, in the suction pipe 20, a difference between the interval between the suction holes 21 included in the first row and the suction holes 21 included in the last row may be 35% or more. For example, if the interval between the suction holes 21 in the first row is 11 mm and the interval between the suction holes 21 in the last row is 16 mm, the gap between the suction holes 21 is 68.75%.

When the gap between the suction holes 21 included in the first row and the last row is less than 35%, the damage rate of the inner wall surface of the suction pipe 20 through which the first fluid is first introduced (sheared) increases due to corrosion, and the suction pipe 20 ) may be cut off and fall off.

inner diameter
(mm) Number of suction holes included in the string distance between suction holes Suction fluid flow damage rate Zone 1 Zone 2 Zone 3 Zone 1 Zone 2 Zone 3 comparative example 62.6 15 13.1109 15 30 45 1.1441 2.2882 3.4323 Experimental example 22.5 8.7406 22.5 - - 2.5742
(+125%) - - 15 13.1109 - 37.4 - - 2.8602
(+25%) - 7.5 26.2218 - -45 - 1.716
(-50%) -

Table 1 shows the experimental results comparing the damage rate with the suction pipe of the conventional ejector when the difference in the distance between the suction hole 21 of the zone 1 (upstream of the suction pipe 20) and the zone 3 (downstream of the suction pipe 20) is about 33%. to be. In Zone 3, the damage rate was reduced by about 50% compared to the comparative example, but in Zones 1 and 2, the damage rate was increased by about 125% and 25%, respectively. And, it can be seen that the damage rate of zone 1 is larger than that of zone 3.

In conclusion, if the damage rate of the inner wall of the upstream of the suction pipe 20 is greater than the damage rate of the inner wall of the downstream, there may be a problem in that the upstream of the suction pipe 20 is cut and separated by corrosion.

The suction pipe 20 according to the present invention can divide the suction hole 21 into three zones when the suction hole 21 is formed in a plurality of rows on a part of the surface. When the suction hole 21 is formed in N rows, it is possible to separate the zones by N/3 rows. At this time, the three zones are divided into upstream, midstream, and downstream, and the upstream and downstream based on the midstream may increase or decrease the distance between the suction holes 21 .

The ejector 100 ′ according to the present invention may further include a discharge pipe part 30 . 4 is a cross-sectional view of the ejector 100' according to another embodiment of the present invention.

The discharge pipe part 30 is positioned along the longitudinal direction to communicate with one end of the suction pipe 20 . The discharge pipe part 30 is configured to discharge the mixed fluid in which the first and second fluids are mixed in the suction pipe 20 , and is formed in a tube shape with both ends open and a hollow inside.

The diameter of the discharge pipe part 30 may be formed smaller than the diameter of the suction pipe 20 . The first fluid, the second fluid, and the mixed fluid move from the suction pipe 20 to the discharge pipe part 30 having a narrower diameter, thereby increasing the flow rate and lowering the pressure. Due to this, a suction pressure capable of sucking the first fluid into the suction pipe 20 may be formed.

In addition, the discharge pipe part 30 may further include an extension part 40 at one end so that the mixed fluid can be easily discharged.

The expanded part 40 may have a larger diameter than the discharge pipe part 30 and the suction pipe 20 . Therefore, the expansion part 40 may be formed in such a way that the first fluid, the second fluid, and the mixed fluid are emitted toward the outlet by reducing the velocity energy of the first fluid, the second fluid, and the mixed fluid and increasing the pressure. have.

<Comparative example>

A comparative example is an ejector in which the suction hole is formed at a constant distance along the circumference and the longitudinal direction of the suction pipe. A total of 12 rows of suction holes are formed, and 15 suction holes are formed in one row.

<Example>

In the ejector according to the present invention, the portion of the suction pipe in which the suction hole is formed is divided into three zones, the middle stream has the same number of suction holes in one row as in the comparative example, the upstream has more suction holes than the middle stream, and the downstream has more suction holes than the middle stream A small number of suction holes is formed.

A total of 12 suction holes are formed, 18 suction holes are formed in one upstream line, 15 suction holes are formed in one middle line, and 12 suction holes are formed in one downstream line.

CoV Max WSS
(Pa) comparative example 0.7982 306.5138 Example 0.7809
(-2.2%) 296.5609
(-3.2%)

inner diameter
(mm) Number of suction holes included in the string distance between suction holes Suction fluid flow damage rate Zone 1 Zone 2 Zone 3 Zone 1 Zone 2 Zone 3 comparative example 62.6 15 13.1109 15 30 45 1.1441 2.2882 3.4323 Experimental example 18 10.9258 18 - - 1.6475
(+44%) - - 15 13.1109 - 33 - - 2.517
(+10%) - 12 16.3886 - - 45 - - 2.7458
(-20%)

Referring to Table 2, it can be seen that the coefficient of variation (CoV, Coefficient of Variation) and the maximum WSS (Wall Shear Stress) of the example are reduced compared to the comparative example. CoV means the mixing performance of the ejector, and the lower the value, the more stable the performance. Therefore, the Example was more stable in mixing the fluid than the Comparative Example, and the maximum damage rate of the inner wall of the suction pipe was reduced.

Referring to Table 3, the upstream and middle streams of the example have increased damage rates than the upstream and middle streams of the comparative examples, but the increased damage rates are lower than the downstream of the comparative examples and do not affect the ejector performance.

In addition, the downstream of the example has a reduced damage rate of about 20% compared to the comparative example, and the downstream is the maximum damaged area among the suction pipes.

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as described in the claims below. You will understand that it can be done.

100, 100': ejector
10: body
11: fluid inlet pipe
12: fluid receiver
20: suction pipe
21: suction hole
30: discharge pipe part
40: extension

Claims (10)

a body provided with a fluid accommodating part in which a first fluid introduced through a fluid inlet pipe formed on one side is accommodated; and
a suction pipe inserted into the body and into which a second fluid is introduced to generate suction pressure; and
The suction pipe is
A plurality of suction holes are formed along the circumference and the axial direction, and the suction holes are characterized in that the distance increases from one side to the other along the axial direction,
ejector.
The method of claim 1,
An ejector, characterized in that the interval between the suction holes formed along the circumference of the suction pipe along the second fluid flow direction is increased.
The method of claim 1,
An ejector, characterized in that the gap between the suction holes formed on one side and the other side along the axial direction of the suction pipe is 35% or more.
The method of claim 1,
When a plurality of lines of the suction hole are formed along the axial direction of the suction pipe, it is characterized in that the suction hole is divided into three zones.
The method of claim 1,
The suction hole is
The ejector, characterized in that formed on a portion of the surface of the suction pipe.
The method of claim 1,
The ejector, characterized in that it further comprises; a discharge pipe portion positioned in a hollow tube shape along the longitudinal direction in communication with one end of the suction pipe.
7. The method of claim 6,
The inner diameter is expanded, the expansion part located at the other end of the discharge pipe; characterized in that it further comprises, the ejector.
7. The method of claim 6,
The discharge pipe part,
An ejector, characterized in that the diameter is smaller than the suction pipe.
The method of claim 1,
The ejector, characterized in that it further comprises a; is located between the suction pipe and the end of the body into which the suction pipe is introduced to prevent the first fluid from leaking out of the body.
The method of claim 1,
The ejector, characterized in that the first fluid is sucked into the suction pipe through the suction hole.

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