Demister

Abstract

To provide a demister where pressure loss is reduced.SOLUTION: A demister comprises a plurality of vanes each having a front edge part, a rear edge part, and a body part continuously connecting the front edge part and the rear edge part, and arranged at intervals in an arrangement direction crossing a flow direction. In the front edge part, a thickness is gradually increased toward the body part from a downstream side. In the rear edge part, a thickness is gradually decreased toward a downstream side from the body part. The body part has a convex curved surface curved so as to be convex toward one side of the arrangement direction, and a concave curved surface arranged at the opposite side of the concave curved surface and curved so as to be concave toward one side of the arrangement direction. A capture part for capturing particles contained in a fluid flowing on a surface of the body part is formed at a downstream side from a start point where a curvature in the body part starts to change.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This disclosure relates to a demister.

Background Art

[0002] In various fluid machines including engines, there is a demand to remove foreign substances such as water droplets and particles from the fluid in the path for sucking the fluid. For the purpose of such foreign substance removal, a device called a demister is widely used (for example, Patent Document 1 below). In the device according to Patent Document 1 below, a plurality of vanes extending in a zigzag shape inside a duct are arranged to form a flow path. While the fluid is flowing in the flow path, the flow direction of the fluid changes due to the thin plate-shaped vanes extending in a zigzag shape, but the foreign substances cannot follow the change in the flow direction due to the inertial force they possess and drop out of the flow. That is, they adhere to the surface of the vanes. Thereby, it is said that foreign substances can be removed from the fluid.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the vanes are formed by mere thin plates as described above, since the flow direction of the fluid changes abruptly, flow separation and the like occur, resulting in an increase in pressure loss. As a result, there is a problem that a desired fluid flow rate cannot be obtained on the downstream side of the demister.

[0005] This disclosure has been made to solve the above problems, and an object thereof is to provide a demister with reduced pressure loss.

Means for Solving the Problems

[0006] To solve the above problems, the demister according to the present disclosure has a leading edge located on the upstream side in the direction of fluid flow, a trailing edge located on the downstream side in the direction of flow, and a main body that continuously connects the leading edge and the trailing edge, and comprises a plurality of vanes arranged at intervals in an arrangement direction intersecting the direction of flow, wherein the thickness of the leading edge gradually increases from the downstream side toward the main body, and the thickness of the trailing edge gradually decreases from the main body toward the downstream side, the main body has a convex curved surface that is convex toward one side in the arrangement direction, and a concave curved surface provided on the opposite side of the convex curved surface that is concave toward one side in the arrangement direction, and downstream of the starting point where the curvature of the main body begins to change, a capture portion is formed to capture particles contained in the fluid flowing over the surface of the main body. The vane is provided between the main body and the trailing edge and has a flow straightening portion that extends in the direction of flow. The vane has a streamlined shape in which the thickness increases from the leading edge to the main body and the flow straightening portion, and then gradually decreases towards the trailing edge. Sub-capture portions are formed on both sides of the flow straightening portion in the thickness direction intersecting the direction of flow to capture particles contained in the fluid flowing over the surface of the flow straightening portion. It is. [Effects of the Invention]

[0007] According to this disclosure, a demister with reduced pressure loss can be provided. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view showing the configuration of a demister according to an embodiment of the present disclosure. [Figure 2] This is an enlarged view showing the configuration of a vane according to an embodiment of this disclosure. [Figure 3] This is a perspective view showing an example of the internal configuration of a vane according to the present disclosure. [Figure 4] This is a perspective view showing a modified example of the internal configuration of a vane according to the present disclosure. [Modes for carrying out the invention]

[0009] (Demister configuration) Hereinafter, a demister 1 according to an embodiment of this disclosure will be described with reference to Figures 1 to 3. The demister 1 according to this embodiment is installed, for example, in the intake path of an engine, and is used to remove foreign matter such as water droplets and particles from the fluid flowing into the engine.

[0010] As shown in Figure 1, the demister 1 comprises several vanes 10 (three, for example) and a housing 20 that surrounds these vanes 10 from the outside. The housing 20 has an inlet 21 that opens toward the upstream side in the direction of fluid flow and an outlet 22 that opens toward the downstream side. In the following description, the direction connecting the inlet 21 and the outlet 22 will simply be referred to as the "flow direction," and the side on which the inlet 21 is located as seen from the outlet 22 will simply be referred to as the "upstream side." The opposite side will simply be referred to as the "downstream side."

[0011] Each of the multiple vanes 10 extends in the flow direction and is arranged at intervals in the alignment direction, which is the direction intersecting the flow direction. The positions of the multiple vanes 10 in the flow direction are identical to each other. However, depending on the design and specifications, there may be a front-to-back difference in the positions of the vanes 10.

[0012] (Bane's composition) As shown in Figure 2, each vane 10 has a leading edge 11, a main body 12, a flow straightening section 13, a trailing edge 14, a trapping section 15, and a secondary trapping section 16. The leading edge 11 is the most upstream end of the vane 10. The dimension in the direction of arrangement (i.e., thickness) of the leading edge 11 gradually increases from the upstream side to the downstream side. Hereafter, this dimension in the direction of arrangement will simply be referred to as "thickness".

[0013] The main body 12 is integrally connected to the downstream side of the front edge 11. The main body 12 has a convex curved surface 17 and a concave curved surface 18. The convex curved surface 17 faces one side in the direction of arrangement. The convex curved surface 17 is curved so as to be convex toward one side in the direction of arrangement. Furthermore, the upstream end of the convex curved surface 17 and the downstream end of the front edge 11 are smoothly connected to form a continuous curved surface. In other words, no steps or other differences are formed between these ends.

[0014] The concave surface 18 faces the other side in the direction of arrangement. The concave surface 18 is curved so as to be concave toward one side in the direction of arrangement. Furthermore, the upstream end of the concave surface 18 and the downstream end of the leading edge 11 are smoothly connected to form a continuous curved surface. In other words, no steps or other differences are formed between these ends.

[0015] The convex surface 17 and the concave surface 18 have capture sections 15 formed therein for capturing foreign matter such as particles contained in the fluid flow. The capture sections 15 are positioned downstream of the starting point where the curvature of the convex surface 17 and the concave surface 18 begins to change. In other words, the system is configured to capture foreign matter such as particles at the point when the fluid flow can no longer follow these surfaces due to the change in curvature. Each capture section 15 is a groove that is recessed so as to be embedded inward towards the contour line of the main body 12. That is, the capture sections 15 do not protrude outward from the contour lines of the convex surface 17 and the concave surface 18. Also, the inlet opening of the capture section 15 opens towards the upstream side.

[0016] A flow straightening section 13 is integrally connected to the downstream side of the main body 12. The flow straightening section 13 extends downstream in the flow direction from the downstream end of the main body 12. Sub-capture sections 16, which have the same function as the capture section 15 described above, are provided on both sides of the flow straightening section 13 in the thickness direction. The sub-capture sections 16 are also grooves that are recessed so as to be embedded inward towards the contour line of the flow straightening section 13. In other words, the sub-capture sections 16 do not protrude outward from the contour line of the flow straightening section 13. The inlet opening of the capture section 15 opens toward the upstream side. The sub-capture sections 16 are positioned slightly downstream of the upstream end of the flow straightening section 13. The positions of the pair of sub-capture sections 16 on both sides in the thickness direction are identical in the flow direction.

[0017] A trailing edge 14 is integrally connected to the downstream side of the rectifying section 13. The thickness of the trailing edge 14 gradually decreases from the upstream side to the downstream side. The downstream end of the trailing edge 14 has a pointed shape that is convex toward the downstream side. In other words, the thickness increases from the leading edge 11 to the main body 12 and the rectifying section 13, and then gradually decreases toward the trailing edge 14. As a result, the vane 10 has a streamlined cross-sectional shape. Furthermore, the surface from the leading edge 11 through the convex curved surface 17 to the trailing edge 14 is formed by a single continuous curved surface. Similarly, the surface from the leading edge 11 through the concave curved surface 18 to the trailing edge 14 is formed by a single continuous curved surface.

[0018] As shown in Figure 1, the vanes 10 configured as described above are arranged so that parts of them overlap each other when viewed from the flow direction. Therefore, the cross-sectional area of ​​the intervane channels 31 formed between the vanes 10 gradually decreases downstream in the region from the leading edge 11 to the main body 12 and the straightening section 13, and gradually increases downstream in the diffuser channels 32 formed in the region from the straightening section 13 to the trailing edge 14.

[0019] Next, referring to FIG. 3, the internal structure of the vane 10 will be described. The vane 10 has an outer skin material 41 and a structural member 42. The outer skin material 41 forms each surface of the vane 10 described above. The outer skin material 41 is preferably integrally formed, for example, by three-dimensional laminated molding. The structural member 42 is a member for ensuring the strength and rigidity of the outer skin material 41 by being disposed inside the outer skin material 41. As an example, the structural member 42 is formed by a plurality of beams connecting between the inner surfaces of the outer skin material 41. Also, it is desirable that this structural member 42 is also formed by three-dimensional laminated molding so as to be integrated with the outer skin material 41. That is, the vane 10 has a monocoque structure.

[0020] (Function and effect) When operating the above-described demister 1, first, a fluid is circulated from the inlet 21 to the outlet 22. When the fluid flows into the inter-vane flow path 31, the flow direction changes following the curved surface shape of the vane 10 itself. At this time, while the fluid follows the flow, foreign substances such as particles and water droplets deviate from the flow due to their own weight. The foreign substances that have deviated from the flow are captured by the above-described capture unit 15 and discharged to the outside. Thereafter, in the diffuser flow path 32, the flow velocity of the fluid that has risen in the inter-vane flow path 31 decreases and the static pressure recovers. In this state, as an example, the fluid is sent from the outlet 22 to other external devices and used for various purposes. Depending on the form of other external devices, it is also possible to send the fluid in the original pressure state without passing through the diffuser flow path 32.

[0021] Here, in the conventional demister 1, the flow path was formed by arranging a plurality of thin plates extending in a zigzag shape inside the duct. However, when the flow path is formed by mere thin plates as described above, the pressure loss of the fluid increases inside the demister 1 due to the sudden change in the flow direction of the fluid and the excessive resistance to the fluid. As a result, there was a problem that a desired fluid flow rate and pressure could not be obtained on the downstream side of the demister 1. Therefore, the demister 1 according to the present embodiment employs each of the above-described configurations.

[0022] According to the above configuration, the thickness of the vane 10 increases from the leading edge 11 to the main body 12, and decreases from the main body 12 to the trailing edge 14. In other words, the cross-sectional shape of the vane 10 is streamlined. Therefore, when fluid passes around the vane 10, the flow is not disturbed by the vane 10, and stagnation, vortices, or separation do not occur near the surface of the vane 10. In other words, dead water zones are less likely to form around the vane 10. This reduces the pressure loss in the flow caused by the placement of the vane 10. Furthermore, because the vane 10 is streamlined, the fluid force acting as resistance on the vane 10 is also reduced, thus reducing the load on the vane 10 and allowing for greater flexibility in the support structure of the vane 10. As a result, it is possible to reduce the manufacturing cost and weight of the demister 1.

[0023] Furthermore, with the above configuration, since the flow straightening section 13 is provided downstream of the main body 12, a fluid flow with a desired flow direction can be supplied to the equipment downstream of the vane 10. In other words, the direction in which the main body 12 extends can be appropriately changed according to the fluid flow direction. This reduces the constraints on equipment placed downstream of the demister 1 and improves the versatility of the demister 1.

[0024] Furthermore, with the above configuration, both surfaces from the leading edge 11 to the trailing edge 14 are formed as a single continuous curved surface. In other words, no protrusions or steps are formed on these surfaces. Therefore, turbulence such as vortices or separation does not occur in the flow along these surfaces. Consequently, it becomes possible to further reduce the pressure loss of the fluid.

[0025] In addition, with the above configuration, since the vanes 10 overlap each other, the fluid velocity gradually increases in the flow channels (intervane flow channels 31) between these vanes 10. This makes it possible for the vanes 10 to efficiently remove particles from the fluid.

[0026] Furthermore, with the above configuration, unlike conventional thin plates, the vane 10 itself has thickness, making it possible to place the structural member 42 inside the outer shell material 41. This increases the strength and rigidity of the vane 10. As a result, the durability of the demister 1 is improved, and the demister 1 can be used stably over a long period of time.

[0027] Furthermore, according to the above configuration, the capture portion 15 is recessed so as to be embedded inside the contour of the vane 10. This reduces the impact on the fluid flow compared to, for example, when the capture portion 15 protrudes outward. In other words, it prevents the generation of vortices and separation in the fluid flow. This minimizes the increase in pressure loss caused by the placement of the vane 10. Therefore, it becomes possible to operate equipment connected downstream of the demister 1 more stably and smoothly. It also reduces the energy required to draw in the fluid required by the downstream equipment. This makes it possible to achieve energy savings and cost reductions for the entire system, including the demister 1.

[0028] Furthermore, with the above configuration, since a diffuser flow path 32 is formed between the trailing edges 14, the fluid velocity can be reduced while the static pressure can be restored. This makes it possible to optimize the fluid velocity and pressure to match the characteristics of the equipment used downstream of the demister 1.

[0029] The embodiments of the present disclosure have been described above. It is possible to make various changes and modifications to the above configuration without departing from the gist of the present disclosure. For example, the number of vanes 10 shown in Figure 1 is just one example, and the number of vanes 10 can be increased or decreased as appropriate depending on the design and specifications. Similarly, the number of main body portions 12 provided on the vanes 10 is just one example, and multiple main body portions 12 may be formed in a continuous manner. In other words, it is possible to adopt a configuration in which concave surfaces 18 and convex surfaces 17 are connected alternately. This point, too, can be determined as appropriate depending on the design and specifications. Furthermore, the shape of the structural member 42 inside the outer skin material 41 can also be changed as appropriate depending on the design and specifications. As shown in Figure 4 as a modified example, it is also possible to adopt a configuration in which a space having multiple circular cross-sections is formed inside the outer skin material 41 to ensure the strength and rigidity of the outer skin material 41. Additionally, it is possible to omit the flow straightening portion 13 downstream of the main body portion 12 and adopt a configuration in which the main body portion 12 and the trailing edge portion 14 are directly connected. In this case as well, the configuration of vane 10 may be determined as appropriate according to the design and specifications.

[0030] <Note> The demister 1 described in each embodiment can be understood, for example, as follows:

[0031] (1) The demister 1 according to the first embodiment has a leading edge portion 11 located on the upstream side in the direction of fluid flow, a trailing edge portion 14 located on the downstream side in the direction of flow, and a main body portion 12 that continuously connects the leading edge portion 11 and the trailing edge portion 14, and comprises a plurality of vanes 10 arranged at intervals in an arrangement direction intersecting the direction of flow, wherein the thickness of the leading edge portion 11 gradually increases from the downstream side toward the main body portion 12, and the thickness of the trailing edge portion 14 gradually decreases from the main body portion 12 toward the downstream side, the main body portion 12 has a convex curved surface 17 that is convex toward one side in the arrangement direction, and a concave curved surface 18 provided on the opposite side of the convex curved surface 17 that is concave toward one side in the arrangement direction, and downstream of the starting point where the curvature of the main body portion 12 begins to change, a capture portion 15 is formed to capture particles contained in the fluid flowing on the surface of the main body portion 12.

[0032] According to the above configuration, the thickness of the vane 10 increases from the leading edge 11 to the main body 12, and decreases from the main body 12 to the trailing edge 14. In other words, the cross-sectional shape of the vane 10 is streamlined. Therefore, when fluid passes around the vane 10, the flow is not disturbed by the vane 10, and no stagnation or vortices are generated. This reduces the pressure loss in the flow caused by the placement of the vane 10. In addition, the fluid force acting on the vane 10 is also reduced, which reduces the load on the vane 10 and allows for a margin of error in the support structure of the vane 10.

[0033] (2) The demister 1 according to the second embodiment is the demister 1 of (1), further comprising a flow straightening portion 13 provided between the main body portion 12 and the trailing edge portion 14 and extending in the direction of flow.

[0034] With the above configuration, the presence of the flow straightening section 13 allows for the supply of a fluid flow with a desired flow direction to the equipment downstream of the vane 10. This improves the versatility of the demister 1.

[0035] (3) The demister 1 according to the third embodiment is the demister 1 of (1) or (2), wherein the surface from the leading edge 11 through the convex curved surface 17 to the trailing edge 14, and the surface from the leading edge 11 through the concave curved surface 18 to the trailing edge 14, are each formed by a single continuous curved surface.

[0036] According to the above configuration, both surfaces from the leading edge 11 to the trailing edge 14 are formed as a single continuous curved surface. In other words, no protrusions or steps are formed on these surfaces. Therefore, turbulence does not occur in the flow along these surfaces. Consequently, it becomes possible to further reduce the pressure loss of the fluid.

[0037] (4) The demister 1 according to the fourth embodiment is a demister 1 according to any one embodiment of (1) to (3), wherein some of the plurality of vanes 10 are arranged to overlap each other when viewed from the flow direction.

[0038] With the above configuration, the vanes 10 overlap each other, which increases the fluid velocity in the flow path between them. This makes it possible for the vanes 10 to efficiently remove particles from the fluid.

[0039] (5) The demister 1 according to the fifth embodiment is a demister 1 according to any one embodiment of (1) to (4), wherein the vane 10 has an outer skin material 41 which is integrally formed and has the outer surface of the front edge portion 11, the outer surface of the rear edge portion 14, the convex curved surface 17, and the concave curved surface 18, and a structural member 42 which is disposed inside the outer skin material 41.

[0040] With the above configuration, the vane 10 itself has thickness, which makes it possible to place the structural member 42 inside the outer shell material 41. This increases the strength and rigidity of the vane 10. As a result, the durability of the demister 1 is improved, and the demister 1 can be used stably over a long period of time.

[0041] (6) The demister 1 according to the sixth embodiment is the demister 1 according to any one embodiment of (1) to (5), wherein the capturing portion 15 is formed to be recessed so as to be embedded inside the contour line of the vane 10.

[0042] With the above configuration, since the capture portion 15 is recessed so as to be embedded inside the contour of the vane 10, the influence on the fluid flow can be kept to a minimum compared to, for example, when the capture portion 15 protrudes outwards. This makes it possible to minimize the increase in pressure loss caused by the placement of the vane 10.

[0043] (7) The demister 1 according to the seventh embodiment is a demister 1 according to any one embodiment of (1) to (6), wherein a diffuser channel 32 is formed between the trailing edges 14 of a pair of vanes 10 adjacent to each other in the direction of arrangement, the channel cross-sectional area of ​​which gradually increases as it moves downstream.

[0044] With the above configuration, since a diffuser flow path 32 is formed between the trailing edges 14, the fluid velocity can be reduced while the static pressure can be restored. This makes it possible to optimize the fluid velocity and pressure to match the characteristics of the equipment used downstream of the demister 1. [Explanation of symbols]

[0045] 1…Demister 10...Bane 11…Front edge 12...Main body 13... Rectifier section 14... Trailing edge 15… Supplementary section 16... Subsidiary Supplement 17...Convex curved surface 18…Concave surface 20… Housing 21...Inlet 22... Outlet 31... Intervane channel 32... Diffuser channel 41…Outer skin material 42… Structural members

Claims

1. The leading edge located on the upstream side in the direction of fluid flow, The trailing edge located downstream in the flow direction, A main body portion that continuously connects the front edge portion and the rear edge portion, It has a plurality of vanes that are spaced apart in an arrangement direction intersecting the flow direction, In the aforementioned leading edge portion, the thickness gradually increases from the downstream side toward the main body portion. In the aforementioned trailing edge portion, the thickness gradually decreases as you move downstream from the main body portion. The main body portion has a convex surface that is curved to be convex toward one side in the direction of arrangement, and a concave surface provided on the opposite side of the convex surface that is curved to be concave toward one side in the direction of arrangement. Downstream from the starting point where the curvature of the main body begins to change, a capturing portion is formed to capture particles contained in the fluid flowing on the surface of the main body. The vane is provided between the main body and the trailing edge and has a flow straightening portion that extends in the direction of flow. The vane has a streamlined shape in which its thickness increases from the leading edge to the main body and the rectifying portion, and then gradually decreases towards the trailing edge. A demister in which sub-capture portions are formed on both sides in the thickness direction intersecting the flow direction of the rectifying portion, for capturing particles contained in the fluid flowing on the surface of the rectifying portion.

2. The demister according to claim 1, wherein the surface from the leading edge through the convex curved surface to the trailing edge, and the surface from the leading edge through the concave curved surface to the trailing edge, are each formed by a single continuous curved surface.

3. The demister according to claim 1 or 2, wherein some of the plurality of vanes are arranged to overlap each other when viewed from the direction of flow.

4. The demister according to claim 1 or 2, wherein the vane comprises an outer shell material integrally formed with the outer surface of the front edge portion, the outer surface of the rear edge portion, the convex curved surface, and the concave curved surface, and a structural member disposed inside the outer shell material.

5. The demister according to claim 1 or 2, wherein the capturing portion is formed by being recessed so as to be embedded inside the contour line of the vane.

6. The demister according to claim 1 or 2, wherein a diffuser channel is formed between the trailing edges of a pair of vanes adjacent to each other in the direction of the arrangement, the channel cross-sectional area of ​​which gradually increases as it moves downstream.

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