JP6472738B2 - Swirl prevention device and pump equipment provided with vortex prevention device - Google Patents

Description

  The present invention relates to a vortex prevention device and a pump facility including the vortex prevention device.

  The shape and dimensions of the suction water tank in the pump facility are limited by the shape of the site where the pump facility is installed, the shape of the pump facility itself, or other economic circumstances. For example, recently, there are many cases where it is required to make the size of the suction tank as small as possible.

  FIG. 1A is a schematic perspective view of a suction water tank installed in a pump facility. FIG. 1B is a plan view of the suction water tank shown in FIG. 1A. In the illustrated example, the suction water tank 1 has a box shape having a bottom portion 2, and one of the side portions thereof is opened and communicates with the water channel 3. Side walls are formed on the side portions of the suction water tank 1 other than the opened side portions. The side walls are transparently illustrated as a pair of side walls 4L and 4R parallel to the flow direction of the water channel 3 and a side wall 5 positioned at the end of the water flow from the water channel 3. A suction port 6 of the pump is inserted into the suction water tank 1 from above and disposed in water. By the operation of the pump, the water in the suction tank 1 is pumped through the suction port 6, and the water flows into the suction tank 1 from the water channel 3.

  When the size of the water tank is reduced in the suction water tank 1 having such a structure, the distance between the suction port 6 and the inner wall surface of the suction water tank 1, that is, the bottom portion 2, the side walls 4L and 4R, and the side wall 5 is shortened. As a result of the increased water flow rate in the interior, vortices are likely to occur. If the generated vortex is sucked into the pump through the suction port 6, it may cause a decrease in pumping performance, noise, vibration, etc., resulting in a malfunction of the pump or inability to pump. .

  Here, the vortex generated in the suction water tank 1 can be roughly classified into four according to the location where it is generated. The vortices of the first to fourth classifications are shown in FIG. 1A and FIG. The first category vortex Γ 0 is an underwater vortex generated between the bottom 2 of the suction water tank 1 and the suction port 6. The second category vortex Γ1 is an underwater vortex generated between the side walls 4L, 4R of the suction water tank 1 and the suction port 6. The third category vortex Γ 2 is an underwater vortex generated between the side wall 5 of the suction water tank 1 and the suction port 6. The fourth category of vortex Γ3 is a water surface vortex generated between the water surface and the suction port 6.

  Between the above vortices Γ0 to Γ3, the places where the vortices are generated and the way the vortices grow are different. Accordingly, the appropriate structure of the vortex prevention device for preventing the generation of vortices may differ between the respective types of vortices. Many of the conventional vortex prevention devices have been optimized to prevent the generation of any specific type of vortex, but on the other hand, for other types of vortices that are not specifically targeted A sufficient vortex prevention effect could not be obtained. By the way, how many types of vortices are generated in an actual suction tank is because the suction tank is often installed underground, so there is no light, and the stored water may be cloudy , Difficult to identify. Therefore, the conventional vortex prevention device as described above may not necessarily prevent the vortex actually generated in the suction water tank.

Therefore, in recent years, vortex prevention devices intended to prevent the generation of a plurality of types of vortices have been proposed. For example, in Patent Document 1, a cross-shaped baffle is attached immediately below the suction port, and a punching metal having a semi-cylindrical shape surrounding the suction port in a region corresponding to the water tank end side of the suction port and having a longitudinal section in the water channel direction opened. The pump installation which arrange | positioned the vortex prevention member formed with the board of this is described. In this case, a punching metal plate is disposed between the wall surface of the suction water tank and the suction port. Therefore, the water between the wall surface of the suction water tank and the punching metal plate flows to the suction port side through a hole opened in the punching metal plate. However, since the number and size of the holes formed in the plate are limited, the aperture ratio of the punching metal plate is small, and the pressure loss generated in the holes is large, so that water does not flow easily. Therefore, a new wall surface is formed by the punching metal plate. That is, the flow of water flowing into the suction water tank from the water channel is narrowed around the suction port, not the width between the wall surfaces of the suction water tank, but the diameter of the semi-cylindrical plate of the punching metal. Therefore, it becomes difficult for water to flow into the suction port, and the suction performance of the pump may be reduced. In addition, it is difficult for water to flow in, and the water in the narrow space surrounded by punching metal is pumped at the same pumping amount as before, so the water pressure at the suction port decreases, and the punching metal and suction of the vortex prevention member A new vortex may be formed between the mouth and the vortex generated from the wall surface of the punching metal.

  Moreover, in patent document 2, the vortex prevention apparatus of various shapes attached immediately under the suction opening of a pump is proposed. These vortex prevention devices have an upwardly convex conical member having a plurality of through-holes disposed in common below the suction port. Thereby, the vortex (vortex Γ0 shown in FIGS. 1A and 1B) generated from the bottom of the water tank can be prevented. However, the vortex generated from the side wall of the aquarium (vortices Γ1, Γ2 shown in FIGS. 1A and 1B) and the water surface vortex generated between the water surface and the suction port 6 (also vortex Γ3) grow and become conical. Intrusion of the vortex extending between the member and the suction port may not be sufficiently cut off and prevented. Moreover, the vortex prevention device proposed in Patent Document 2 is uniformly formed both in the direction from the suction port toward the water channel and in the direction toward the side wall of the suction water tank. Originally, if a device such as a vortex prevention device is provided near the suction port, the vortex prevention device itself acts as a flow resistor. Therefore, since the water flow from the water channel toward the suction port is also a region where vortices are not generated so much, it should be considered to reach the suction port with less resistance. However, since the vortex prevention device proposed in Patent Document 2 is uniformly formed in any direction, the water flow from the water channel to the suction port is subjected to resistance more than necessary, and the suction performance of the pump may be reduced. There is.

  Note that the vortex prevention devices proposed in Patent Document 1 and Patent Document 2 are all attached to the suction port of the pump. In this case, an increase in the weight of the suction port portion of the pump including the vortex prevention device may change the balance of the weight with the other portions of the pump, resulting in an increase in vibration generated during operation of the pump. is there. In consideration of such points, there are considerable design restrictions in the vortex prevention device of the type attached to the suction port of the pump.

On the other hand, in addition to the intention of preventing the generation of a plurality of types of vortices as in Patent Document 1 and Patent Document 2, the vortices attached to the suction water tank side instead of being attached to the pump. Prevention devices have also been proposed. More specifically, Patent Document 3 describes a pump facility in which a vortex preventing member formed of punching metal or expanded metal is installed on the bottom surface of the suction water tank so as to surround the suction port of the pump. However, when punching metal is used, pressure loss occurs in the water flow through the opening because the opening ratio is small, and a new wall surface that replaces the wall surface of the suction water tank is formed between the pump suction port and the wall surface of the suction water tank. Therefore, it is the same as in Patent Document 1 that there is a possibility that the suction pressure of the pump is lowered, the suction performance is lowered, and a new vortex is formed. In addition, in the case of Patent Document 3, there is a possibility that the generation of the vortex Γ0 is promoted by the pressure being lowered too much on the inner side surrounded by the punching metal. On the other hand, if an expanded metal is used, an aperture ratio can be enlarged. However, since the area where the expanded metal interferes with the water flow is short in the direction of the water flow, that is, the direction perpendicular to the plate surface, the water flow through the opening of the expanded metal continues to flow in the direction perpendicular to the plate surface as it is. Cannot be rectified. Therefore, for example, when the vortex generated on the wall of the suction tank (vortices Γ1, Γ2 shown in FIGS. 1A and 1B) grows and reaches the expanded metal, the vortex continues to grow in the direction of the suction port through the opening. Sisters,
A sufficient vortex prevention effect cannot be obtained. Moreover, since expanded metal is not high in strength compared to a plate material such as punching metal, the structural strength of the vortex preventing member itself is also reduced.

JP 2004-270479 A JP 2006-299944 A JP 2008-232059 A

  The present invention has been made in view of the above points. One of the objects of the present invention includes a vortex prevention device and a vortex prevention device capable of improving the vortex prevention performance while ensuring a sufficient opening ratio in a vortex prevention device installed in a suction water tank. To provide pump equipment.

  According to an aspect of the present invention, there is provided a vortex prevention device installed in a suction water tank in which a suction port of a pump is arranged. The vortex prevention device is constructed such that a ceiling portion having an opening into which a suction port is inserted, a support column that supports the ceiling portion, and a plate surface between the support columns so as to be parallel to each other. It includes a side current plate that surrounds and a lower current plate that is installed below the suction port.

  In the above configuration, the member for preventing the generation of the vortex from the side of the suction port is configured by the rectifying plate, so that it is possible to improve the vortex prevention performance while ensuring a sufficient opening ratio. . Moreover, generation | occurrence | production of the vortex from a water surface and generation | occurrence | production of the vortex from the downward direction of a suction inlet can also be prevented with a ceiling part and a downward baffle plate.

  In the above vortex preventing device, the side rectifying plate may be arranged horizontally or from the inside to the outside of the vortex preventing device so as to form a gradient of 45 ° or less. In this case, the suction water tank has an open side portion communicating with the water channel and a side wall formed on a side portion other than the opened side portion, and the side rectifying plate facing the open side portion is The side baffle plates that are horizontally disposed and face the side walls may be arranged to form a gradient.

  In the vortex preventing device, the support pillar and the side rectifying plate may form a lattice having an aperture ratio of 80% to 90%. The lower current plate may be connected to the support column.

  According to another viewpoint of this invention, a pump installation provided with a pump, the suction water tank in which the suction inlet of a pump is arrange | positioned, and the vortex prevention apparatus installed in a suction water tank is provided. The vortex prevention device has a ceiling portion having an opening into which the suction port is inserted, a support column that supports the ceiling portion, and a plate surface that is spanned between the support columns so that the plate surfaces are parallel to each other. A flow straightening plate and a lower flow straightening plate installed below the suction port are included.

  In the above pump facility, the side rectifying plate may be arranged horizontally or from the inside to the outside of the vortex preventing device so as to form a gradient of 45 ° or less. In this case, the suction water tank has an open side portion communicating with the water channel and a side wall formed on a side portion other than the opened side portion, and the side rectifying plate facing the open side portion is The side baffle plates that are horizontally disposed and face the side walls may be arranged to form a gradient.

  In the above pump facility, the support pillar and the side rectifying plate may form a lattice having an aperture ratio of 80% to 90%. The lower current plate may be connected to the support column.

It is a typical perspective view of the suction water tank installed in pump equipment. It is a top view of the suction water tank shown to FIG. 1A. It is a rough longitudinal section showing pump equipment provided with a vortex prevention device concerning one embodiment of the present invention. FIG. 3 is an enlarged view of the vortex prevention device shown in FIG. 2. It is a figure which shows the example of the planar shape of the vortex prevention apparatus which concerns on one Embodiment of this invention. It is a figure which shows the example of the planar shape of the vortex prevention apparatus which concerns on one Embodiment of this invention. It is a figure which shows the example of the planar shape of the vortex prevention apparatus which concerns on one Embodiment of this invention. It is a figure which shows the example of the planar shape of the vortex prevention apparatus which concerns on one Embodiment of this invention. It is a figure which shows the example of the planar shape of the vortex prevention apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the aperture ratio in the vortex prevention apparatus which concerns on one Embodiment of this invention. It is a figure which shows the modification of the vortex prevention apparatus which concerns on one Embodiment of this invention.

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

  FIG. 2 is a schematic longitudinal sectional view showing a pump facility including the vortex preventing device according to the embodiment of the present invention. Referring to FIG. 2, the pump facility 10 includes a suction water tank 20, a vortex prevention device 30, and a vertical shaft pump 40. In the pump facility 10, water that flows in from the upstream water channel in the direction indicated by the arrow is stored in the suction water tank 20. When the water level of the suction water tank 20 exceeds the set value, the vertical shaft pump 40 starts operation and drains the water in the suction water tank 20. The vortex prevention device 30 generates vortices in the suction water tank 20 during operation of the vertical shaft pump 40, more specifically, the first to fourth classification vortices described above with reference to FIGS. 1A and 1B. Generation of Γ0 to Γ3 is prevented. In addition, since the vortex preventing device 30 is attached not to the vertical shaft pump 40 but to the suction water tank side, the design restriction of considering the influence of the vortex preventing device 30 on the vibration of the vertical shaft pump 40 is eliminated.

  The vortex prevention device 30 includes a ceiling portion 31, a plurality of support columns 32 that support the ceiling portion 31, and a side rectifying plate 33 that is spanned between the support columns 32 so that the plate surfaces are parallel to each other. . The side rectifying plate 33 surrounds the suction port 41 of the vertical shaft pump 40 as a whole. In the illustrated example, since the side rectifying plate 33 is disposed over the entire circumference of the region surrounding the suction port 41, the overall planar shape of the side rectifying plate 33 is cylindrical. As will be described later, when some of the side rectifying plates 33 are omitted, the overall planar shape of the side rectifying plates 33 may be U-shaped or C-shaped. In this case, the U-shaped or C-shaped open side faces the upstream (water channel) direction. An example of the planar shape of the vortex preventing device 30 will be described later. Further, the vortex preventing device 30 includes a lower rectifying plate 34 installed below the suction port 41 of the vertical shaft pump 40. The lower rectifying plate 34 is connected to, for example, the support column 32 or the side rectifying plate 33 and is supported thereby.

  In the vortex prevention device 30, the ceiling portion 31 has an opening 31 a into which the suction port 41 of the vertical shaft pump 40 is inserted. The opening 31a has a size corresponding to the suction port 41 and / or the discharge bowl 42a located above the suction port 41. For example, the dimension of the suction port 41 is set so that the distance from the suction port 41 or the discharge bowl 42a is narrowed to such an extent that the flow of water from the water surface to the suction port 41 via the opening 31a is less likely to occur. . This means that the vortex prevention device 30 can suppress the generation of the water surface vortex generated between the water surface in the suction water tank 20 and the suction port 41, that is, the above-described fourth classification vortex Γ3. In addition, the ceiling part 31 may be assembled by a plurality of parts and may be divided.

Due to the action of the ceiling portion 31 as described above, the water in the suction water tank 20 mainly enters the inside of the vortex prevention device 30 through the side rectifying plate 33 and flows to the suction port 41. . In such a water flow, since the side rectifying plate 33 is provided, the water flow flowing between the side rectifying plates 33 is rectified by the side rectifying plate 33 so as to maintain the flow direction as it is. The Therefore, even if the grown vortex enters between the side rectifying plates 33, the vortex core is cut off, and generation and growth of the vortex are suppressed. In this way, the vortex prevention device 30 relates to the underwater vortex generated between the side wall 23 of the suction water tank 20 and the suction port 41, that is, the above-described second category vortex Γ1 and third category vortex Γ2. Can also be suppressed.

  In addition, as will be described later, the side rectifying plate 33 is disposed so as to form a relatively small gradient from the inside to the outside of the vortex preventing device 30 in the horizontal direction. The baffle plate suppresses the intrusion of vortices by rectifying the flow so as to maintain the flow direction, not blocking the flow. Therefore, with regard to the pressure loss reduction required for the vortex prevention member and the problem of pressure drop and vortex generation in the vortex prevention device, the pressure loss is taken by taking a larger aperture ratio than when forming the vortex prevention member by punching metal, for example. Therefore, it is possible to obtain a sufficient prevention effect of pressure drop and vortex generation inside the vortex prevention device.

  Further, unlike the case where the vortex preventing member is formed by, for example, expanded metal, each opening is divided by a plate having a width in the direction of the water flow, so that the effect of cutting the rectification and the vortex core is sufficiently obtained. Further, regarding the problem of structural strength when the expanded metal is adopted as the vortex prevention member, the side rectifying plate 33 is bridged between the support columns 32 so that the plate surfaces are parallel to each other. 32 strengthens the structure which supports the ceiling part 31, and can ensure the intensity | strength of the vortex prevention apparatus 30 whole.

  On the other hand, since the vortex prevention device 30 is installed on the bottom portion 22 of the suction water tank 20, the underwater vortex generated between the portion of the bottom portion 22 corresponding to the inside of the vortex prevention device 30 and the suction port 41, that is, the above-described first The classification vortex Γ 0 is not affected by the side rectifying plate 33. Therefore, in this embodiment, at least one lower rectifying plate 34 is installed below the suction port 41 where such a vortex may be generated, and the vortex core is cut off to suppress the generation of the vortex. In order to obtain such an effect, the lower rectifying plate 34 is disposed below the suction port 41 and preferably across the center of the suction port 41. As described above, the lower rectifying plate 34 can be connected to the support column 32 or the side rectifying plate 33, but this not only supports the lower rectifying plate 34, but also includes the support column 32 and the side rectifying plate 33. The structure of the vortex prevention device 30 can also be reinforced.

  With the configuration as described above, the vortex prevention device 30 can suppress the generation of vortices for any of the above-described first to fourth classification vortices Γ0 to Γ3. Since a sufficient opening ratio can be ensured by using the side rectifying plate 33, the vortex prevention device 30 does not become an obstacle to the water flow toward the suction port 41. Further, the strength of the vortex prevention device 30 as a whole can be improved by connecting the support column 32, the side rectifying plate 33, and the lower rectifying plate 34 as necessary.

  The vertical shaft pump 40 includes a stator portion 42 including a discharge bowl 42a including a suction port 41, a suspension pipe 42b connected to the upper end of the discharge bowl 42a, and a discharge elbow 42c connected to the upper end of the suspension pipe 42b. Have. The stator portion 42 is connected to the foundation floor 11 constructed above the suction water tank 20 via the support member 12, thereby supporting the vertical shaft pump 40. Further, the vertical shaft pump 40 is connected to the impeller 43a disposed in the discharge bowl 42a and the impeller 43a, extends vertically upward in the suspension pipe 42b, penetrates the discharge elbow 42c, and is connected to the drive mechanism 44. And a rotor portion 43 including a rotating shaft 43b. The drive mechanism 44 includes a motor or engine, a speed reducer, and the like.

As described above, the water that has passed through the vortex prevention device 30 from the suction water tank 20 and is sucked into the suction port 41 of the vertical shaft pump 40 is pumped up in the suspension pipe 42b by the rotation of the impeller 43a and discharged. It is discharged from the elbow 42c. In the pump facility 10 according to the present embodiment, the generation of vortices in the suction water tank 20 is suppressed by the vortex prevention device 30, and as a result, the vortex is sucked into the suction port 41, causing a functional failure in the vertical shaft pump 40. In this case, it becomes possible to prevent the water from being drained and to achieve sufficient pumping performance.

  FIG. 3 is an enlarged view of the vortex prevention device shown in FIG. In FIG. 3, in particular, the attachment angle of the side rectifying plate 33 of the vortex prevention device 30 is shown in relation to the side wall 23 of the suction water tank 20. More specifically, the side rectifying plate 33 (illustrated as the side rectifying plate 33a) facing the side wall 23 of the suction water tank 20 forms a gradient having an angle θ1 from the inside to the outside of the vortex preventing device 30. To be arranged. Here, the angle θ1 is a relatively small angle, for example, 0 <θ1 ≦ 45 °, preferably 0 <θ1 ≦ 30 °. This is because if the angle θ1 is too large, it becomes a resistance to flow. The angle θ1 is common to the respective side rectifying plates 33a. Accordingly, the plate surfaces of the side rectifying plates 33a are parallel to each other. In the illustrated example, the gradient is a downward gradient from the inside to the outside of the vortex prevention device 30. By arranging the side rectifying plate 33a in this way, the water surface vortex generated between the water surface in the suction water tank 20 and the suction port 41 while maintaining a low pressure loss when flowing into the vortex prevention device 30. That is, the above-described fourth category vortex Γ3, the underwater vortex generated between the side wall 23 of the suction water tank 20 and the suction port 41, that is, the above-described second category vortex Γ1, and the third category vortex. Γ2 is less likely to enter the inside of the vortex prevention device 30 due to the gradient of the side rectifying plate 33a, and in the flow of water from the side wall 23 toward the suction port 41, the vortex core is more reliably cut off. The underwater vortex generated between the two can be suppressed.

  On the other hand, the other side, that is, the side rectifying plate 33 (illustrated as the side rectifying plate 33b) facing the opened side of the suction water tank 20 is horizontally or has a smaller angle than the side rectifying plate 33a. Arranged to form a gradient. The side rectifying plates 33b are all horizontal or arranged to form a common small angle gradient for each side rectifying plate 33b. Accordingly, the plate surfaces of the side rectifying plates 33b are also parallel to each other. As described above with reference to FIGS. 1A and 1B, the generation of underwater vortices is less noticeable in the opened side portion of the suction water tank 20 than in the other side portions. Therefore, the side rectifying plate 33b can be installed horizontally in order to minimize the flow resistance. In this example, the side rectifying plate 33b is 30 ° to 60 ° on both sides from the direction from the center of the suction port 41 toward the opened side of the suction water tank 20 when the vortex prevention device 30 is viewed in plan. The side rectifying plate 33 can be included in the range.

  Furthermore, the side rectifying plate 33 (the above-described side rectifying plate 33b) facing the opened side of the suction water tank 20 may be omitted. In this case, the overall planar shape of the side rectifying plate 33 is not U-shaped but U-shaped or C-shaped. However, the effect of the side rectifying plate 33 reinforcing the structure of the vortex preventing device 30 is higher when the side rectifying plate 33b is installed. Further, a water surface vortex generated between the water surface and the suction port 41 bypassing the ceiling portion 31 or a submerged vortex generated between the portion of the bottom portion 22 on the outside of the vortex prevention device 30 and the suction port 41 is taken into consideration. Even in this case, it is advantageous to install the side rectifying plate 33b.

  In addition, the example shown in FIG. 3 is an example in the case of giving a structural difference between the side rectifying plate 33b facing the opened side portion of the suction water tank 20 and the other side rectifying plate 33a. is there. In another example, the side rectifying plate 33 may be disposed at a uniform angle in any part. That is, in the direction from the inner side to the outer side of the vortex preventing device 30, all the side rectifying plates 33 may be arranged horizontally, or all the side rectifying plates 33 may be arranged so as to form a gradient. Good.

Subsequently, some examples of the planar shape of the vortex prevention device according to the embodiment of the present invention will be described with reference to FIGS. In addition, the figure of the planar shape of the vortex prevention device described below is
This corresponds to a cross-sectional view of the vortex preventing device 30 shown in FIG.

  FIG. 4 is a diagram illustrating a first example of a planar shape of the vortex prevention device according to the embodiment of the present invention. The vortex preventing device 30a shown in FIG. 4 has a hexagonal planar shape. In the vortex prevention device 30a, six support columns 32 are arranged at each vertex of the hexagon, and six sets of side rectifying plates 33 are attached between the support columns 32 adjacent to each other, that is, on each side of the hexagon. Further, in the vortex preventing device 30a, the three lower rectifying plates 34 are disposed between the opposing support columns 32, that is, along a diagonal line passing through the center of the hexagon. It is preferable that the hexagonal center, that is, the position where the three lower rectifying plates 34 intersect each other coincides with the center of the suction port 41.

  Moreover, in said 1st example, the side baffle plate 33 is 5 sets of side baffle plates 33a which faced the side wall 23 of the suction water tank 20, and one set which faced the open side part of the suction water tank 20. Side rectifying plate 33b. As already described, the side rectifying plate 33a is arranged so as to form a downward gradient from the inside to the outside of the vortex preventing device 30. Further, the side rectifying plate 33b is disposed horizontally. In other examples, all the lateral baffles 33 may be arranged in the same manner (horizontally or so as to form a gradient). In still another example, the side rectifying plate 33b facing the opened side of the suction water tank 20 may be omitted.

  FIG. 5 is a diagram illustrating a second example of the planar shape of the vortex prevention device according to the embodiment of the present invention. The vortex prevention device 30b shown in FIG. 5 has a hexagonal planar shape as in the first example shown in FIG. However, as a difference from the first example, in the vortex prevention device 30b, not the hexagonal side (that is, the side rectifying plate 33) but the apex (that is, the support column 32) is the side where the suction water tank 20 is opened. Is directed to the department. Therefore, in the vortex preventing device 30b, two sets of side rectifying plates 33b attached between the support columns 32 directed to the opened side portions of the suction water tank 20 and the support columns 32 on both sides thereof are horizontally arranged. The remaining four sets of side rectifying plates 33a can be arranged so as to form a downward gradient from the inside to the outside of the vortex prevention device 30.

  FIG. 6 is a diagram illustrating a third example of the planar shape of the vortex preventing device according to the embodiment of the present invention. The vortex preventing device 30c shown in FIG. 6 has a circular planar shape. In the vortex preventing device 30c, six support pillars 32 are arranged at points that divide the planar circumference into approximately six equal parts, and six sets of side rectifications between the support pillars 32 adjacent to each other, that is, along the circumference. A plate 33 is attached. Further, in the vortex preventing device 30c, three lower rectifying plates 34 are arranged along a line connecting the support pillars 32 facing each other across the center of the circle, that is, the diameter of the circle. The center of the circle, that is, the position where the three lower rectifying plates 34 intersect with each other, preferably coincides with the center of the suction port 41.

  In the third example as described above, the arrangement of the side rectifying plates 33 may be the same as that of the first example described above with reference to FIG. That is, one set of side rectifying plates 33b facing the opened side of the suction water tank 20 is horizontally disposed, and the other five sets of side rectifying plates 33a are directed outward from the inside of the vortex preventing device 30. It can be arranged to form a down slope. However, as a difference from the first example, in the vortex prevention device 30c, the planar shape of each side rectifying plate 33 is an arc shape. When the circular planar shape shown in FIG. 6 is rotated by 30 ° around the center of the circle, the arrangement of the side rectifying plates 33 is the same as that of the second example instead of the first example. Arrangement can be adopted.

FIG. 7 is a diagram illustrating a fourth example of a planar shape of the vortex prevention device according to the embodiment of the present invention. The vortex prevention device 30d shown in FIG. 7 has a triangular planar shape. In the vortex preventing device 30d, six support pillars 32 are arranged in accordance with each vertex of the triangle and the middle point of each side, and a line obtained by dividing each side of the triangle into two parts between the support pillars 32 adjacent to each other. Six side rectifying plates 33 are attached along the minute. Further, in the vortex preventing device 30d, three lower rectifying plates 34 are arranged along a line segment connecting each vertex of the triangle and the midpoint of the opposite side. The center of the triangle, ie 3
It is preferable that the position where the lower rectifying plates 34 of the sheets intersect with each other coincides with the center of the suction port 41.

  In the fourth example as described above, one side of the triangular shape of the planar shape of the vortex preventing device 30d is directed to the opened side portion of the suction water tank 20. Therefore, in the vortex preventing device 30d, the two sets of side rectifying plates 33b that form this side are horizontally arranged, and the remaining four sets of side rectifying plates 33a are inclined downward from the inside to the outside of the vortex preventing device 30. Can be arranged to form.

  FIG. 8 is a diagram showing a fifth example of a planar shape of the vortex prevention device according to the embodiment of the present invention. The vortex prevention device 30e shown in FIG. 8 has a triangular planar shape as in the fourth example shown in FIG. However, as a difference from the fourth example, in the vortex preventing device 30e, the apex (that is, the support column 32) is not the triangular side (that is, the side rectifying plate 33), but the side portion where the suction water tank 20 is opened. Is directed to. Therefore, in the vortex prevention device 30e, two sets of side rectifying plates 33b attached between the support columns 32 facing the opened side portions of the suction water tank 20 and the support columns 32 on both sides thereof are horizontally arranged. Then, the remaining four sets of side rectifying plates 33a can be arranged so as to form a downward gradient from the inside to the outside of the vortex preventing device 30.

  The example of the planar shape of the vortex prevention device according to the embodiment of the present invention has been described above with reference to FIGS. The planar shape of the vortex prevention device is not limited to the example shown and described, and various shapes are possible. For example, the vortex preventing device may have an arbitrary polygonal planar shape such as a quadrangle or a pentagon in addition to the triangle and hexagon in the illustrated example. Further, the planar shape of the vortex preventing device is not necessarily a shape having point symmetry such as a regular hexagon, a circle, and a regular triangle in the illustrated example. For example, the planar shape may be a shape having only line symmetry such as an ellipse or an isosceles triangle. Further, although the side rectifying plate 33b has been described as being horizontally arranged, it is not necessarily strictly arranged horizontally, for example, arranged so as to form a smaller gradient than the side rectifying plate 33a. Also good.

  FIG. 9 is a view for explaining the aperture ratio in the vortex prevention device according to the embodiment of the present invention. FIG. 9 is a schematic development view of the side surface of the vortex prevention device 30. Note that the point P and the point P ′, and the point Q and the point Q ′ in FIG. In the illustrated example, the aperture ratio is the aperture ratio of the grid formed by the support columns 32 and the side rectifying plates 33, that is, the flow is blocked by the support columns 32 and the side rectifying plates 33 in the rectangular PP′Q′Q. Calculated as the area ratio of the missing part. In the present embodiment, the aperture ratio calculated in this way can be, for example, 80% to 90%, preferably about 85%.

  FIG. 10 is a view showing a modification of the vortex prevention device according to the embodiment of the present invention. FIG. 10 shows a vortex prevention device 30x as a modification of the vortex prevention device 30 described above. In the vortex preventing device 30x, the side rectifying plate 33 is disposed so as to form a gradient having an angle θ2 in a direction parallel to the side surface of the vortex preventing device 30. Here, the angle θ2 is a relatively small angle, for example, 0 <θ2 ≦ 45 °, preferably 0 <θ2 ≦ 10 °. Since the vortex cores of the vortex Γ1 and vortex Γ2 described above with reference to FIGS. 1A and 1B tend to move in the vertical direction, the angle θ2 is preferably smaller. The angle θ2 is common to the side rectifying plates 33. Therefore, also in this case, the plate surfaces of the side rectifying plates 33 are parallel to each other. In the vortex prevention device 30 described above, the side rectifying plate 33 is horizontal in this direction.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the technical scope of the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present invention can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that it belongs to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Pump equipment 20 Suction water tank 22 Bottom part 23 Side wall 30 Eddy prevention apparatus 31 Ceiling part 31a Opening 32 Support pillar 33 Side rectifier plate 34 Lower rectifier plate 40 Vertical shaft pump 41 Suction port

Claims (10)

A vortex prevention device installed in a suction water tank in which a pump suction port is arranged,
A ceiling portion having an opening into which the suction port is inserted; and
A support column for supporting the ceiling,
A side rectifying plate that is spanned between the support pillars so that the plate surfaces are parallel to each other, and surrounds the suction port as a whole,
A vortex prevention device comprising: a lower current plate installed below the suction port.   2. The vortex preventing device according to claim 1, wherein the side rectifying plate is disposed so as to form a gradient of 45 ° or less horizontally from the inside to the outside of the vortex preventing device. The suction tank has an open side communicating with a water channel, and a side wall formed on a side other than the opened side.
The lateral baffles facing the open side are arranged horizontally,
The vortex prevention device according to claim 2, wherein the side rectifying plate facing the side wall is arranged to form the gradient.   The vortex prevention device according to any one of claims 1 to 3, wherein the support column and the side rectifying plate form a lattice having an aperture ratio of 80% to 90%.   The vortex prevention device according to claim 1, wherein the lower rectifying plate is connected to the support pillar. A pump,
A suction water tank in which the suction port of the pump is disposed;
A vortex prevention device installed in the suction water tank,
A ceiling part having an opening into which the suction port is inserted;
A support column for supporting the ceiling,
A vortex preventing device including a side rectifying plate that is spanned between the support pillars so that plate surfaces are parallel to each other and surrounds the suction port as a whole, and a lower rectification plate installed below the suction port; With pump equipment.   The pump facility according to claim 6, wherein the side rectifying plate is disposed so as to form a gradient of 45 ° or less horizontally from the inside to the outside of the vortex preventing device. The suction tank has an open side communicating with a water channel, and a side wall formed on a side other than the opened side.
The lateral baffles facing the open side are arranged horizontally,
The pump equipment according to claim 7, wherein the side rectifying plate facing the side wall is arranged to form the gradient.   The pump equipment according to any one of claims 6 to 8, wherein the support pillar and the side rectifying plate form a lattice having an aperture ratio of 80% to 90%.   The pump facility according to claim 6, wherein the lower rectifying plate is coupled to the support pillar.

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