JP6983090B2 - Pumps, vortex suppressors and pump equipment - Google Patents

Description

The present invention relates to a pump having a vortex suppressing portion at the suction port, a vortex suppressing member that can be attached to the suction port, and a pump facility having the pump in the suction tank.

Conventionally, as shown in FIGS. 27 and 28, for example, water 101 such as rainwater flows into a water absorption tank 102 of a pumping station, is sucked up by a pump 103, and is sent from the water absorption tank 102 to a treatment facility on the downstream side. The standard water absorption tank 102 has a pair of side wall surfaces 104, a rear wall surface 105, and a bottom surface 106, and the suction port 108 of the pump 103 is provided in the water absorption tank 102 and is on the front side of the rear wall surface 105.

In the standard water suction tank 102, the height H from the bottom surface 106 of the water suction tank 102 to the suction port 108 of the pump 103 is usually designed to be substantially the same as the diameter A of the pumping pipe 109, and the suction port 108. The distance B from the axis 110 (center) of the water absorbing tank 102 to the rear wall surface 105 of the water absorbing tank 102 is determined based on the flow rate of the water absorbing tank 102.

By operating the pump 103, the water 101 in the water suction tank 102 flows into the pump 103 from the suction port 108, passes through the pump 103, and is sent to the treatment facility on the downstream side. When the pump 103 is being operated, an underwater vortex 111 and an air suction vortex 112 may be generated in the water suction tank 102.

The underwater vortex 111 is a vortex in which the pressure of the vortex flow generated from the bottom surface 106 and the side wall surface 104 of the water suction tank 102 drops below the vapor pressure and is sucked into the suction port 108. The air suction vortex 112 is a vortex in which a vortex flow generated from the water surface toward the suction port 108 carries air on the water surface and is sucked into the suction port 108.

When such an underwater vortex 111 or an air suction vortex 112 is sucked into the pump 103 from the suction port 108, there is a possibility that violent vibration or loud noise may occur during the operation of the pump 103.

The graph G1 in FIG. 29 is a graph conceptually showing the state of the flow velocity distribution (approaching flow velocity distribution) approaching the suction port 108 in the standard water suction tank 102, and is a graph showing the flow velocity V1 near the water surface and the bottom surface 106. The flow velocity V2 in the vicinity tends to be faster. The reason for showing such a flow velocity distribution is that the following flow F1 near the water surface and the flow F2 near the bottom surface 106, which have a high flow velocity, are generated in the water absorption tank 102. That is, the flow F1 near the water surface passes from the upstream side to the side of the pump 103, becomes a downward flow F1'descending along the rear wall surface 105, and is sucked into the suction port 108. Further, the flow F2 near the bottom surface 106 approaches the pump 103 from the upstream side and is sucked into the suction port 108.

As a countermeasure against the generation of vibration and noise as described above, for example, Patent Document 1 below discloses a technique for suppressing the generation of an underwater vortex 111. As shown in FIGS. 30 to 32, the suction port 108 of the pump 103 is provided with a vortex prevention device 120, and the vortex prevention device 120 has a substantially planar shape with a baffle 121 arranged directly below the suction port 108. It has a semi-circular underwater vortex generation preventing member 122. The underwater vortex generation prevention member 122 is made of punching metal having a large number of through holes 123, is attached to the outer end of the baffle 121, and faces the rear wall surface 105 of the water absorption tank 102.

Further, the baffle 121 has first and second baffle plates 124 and 125 that intersect in a cross shape. These baffle plates 124 and 125 are each formed in a concave shape, and the first baffle plate 124 has a front opening 128 that allows the front side 126 (upstream side) and the inside 127 of the underwater vortex generation prevention member 122 to communicate with each other. Is formed.

Even if a swirling flow 129 is generated in the rear region or the lateral region of the suction port 108 when the pump 103 is being operated, the swirling flow 129 is a stage before the underwater vortex 111 develops, and the underwater vortex generation preventing member 122 It passes through the through hole 123, is rectified at this time, weakens the swirling component, and is sucked into the inside of the pump 103 from the suction port 108 in a state where it is prevented from developing into the underwater vortex 111. As a result, the generation of the underwater vortex 111 is suppressed.

JP-A-2004-270479

However, in the conventional type in which the suction port 108 shown in FIGS. 30 to 32 is provided with the vortex prevention device 120, there is a problem that it takes time and effort to form a large number of through holes 123 in the underwater vortex generation prevention member 122. be. In particular, as the diameter of the pump 103 increases, the size of the underwater vortex generation prevention member 122 also increases, and the plate thickness of the underwater vortex generation prevention member 122 also increases. It took.

Further, by providing the vortex prevention device 120, the swirling flow 129 is sucked into the suction port 108 in a state where the swirling component is weakened, but the underwater vortex generation preventing member 122 is made of punching metal having a large number of through holes 123. Therefore, the downward flow F1'shown in FIG. 29 cannot be sufficiently weakened, which causes a problem that the effect of suppressing the generation of the air suction vortex 112 is insufficient. When the air suction vortex 112 is generated, the air suction vortex 112 may pass through the through hole 123 of the underwater vortex generation prevention member 122 and be sucked from the suction port 108. In this case, during the operation of the pump 103, There was a risk of violent vibration and loud noise.

An object of the present invention is to provide a pump and a vortex suppressing member that can suppress the generation of underwater vortices and air suction vortices and can be easily manufactured.

In order to achieve the above object, the pump in the first invention is provided with a vortex suppressing portion at the suction port.
The vortex suppressing portion has a tubular body having both upper and lower ends open and formed in a fan shape in a plan view.
The upper end opening of the cylinder is continuous with the lower part of the suction port, and the inside of the cylinder communicates with the suction port.
Cylindrical body has a curved plate which is curved in an arc shape, as well as have a radial of the plate-shaped baffle plate provided between both ends in the circumferential direction of the curved plate, and closed around,
In plan view, the curved center of the curved plate substantially coincides with the axis of the suction port.
The radius of the curved plate is equal to or greater than the radius of the suction port.

According to this, by operating the pump with the curved plate of the vortex suppressing part facing the rear wall surface of the water absorption tank, the curved plate passes from the front upstream side to the side of the pump and from the back of the pump to the rear wall surface. After descending along, it becomes resistance to the flow (flow near the water surface) sucked into the suction port. Therefore, the amount of water sucked into the suction port from the rear wall surface side of the water suction tank is smaller than the amount of water sucked into the suction port from the front upstream side of the water suction tank, and the water sucked into the suction port from the rear wall surface side of the water suction tank. The flow velocity is suppressed to be lower than the flow velocity of water sucked into the suction port from the upstream side in front of the water suction tank. As a result, the swirling flow velocity of water near the suction port is sufficiently lower than the underwater vortex generation limit flow velocity, so that the generation of underwater vortices is suppressed.

The underwater vortex generation limit flow velocity is the flow velocity when the generation of the underwater vortex is recognized by gradually increasing the flow velocity in the water absorption tank.

In addition, as described above, the curved plate acts as a resistance to the flow descending from the back of the pump along the rear wall surface, so that the flow descending from the vicinity of the water surface on the upstream side in front of the pump and being sucked into the suction port increases. Since the flow descending from behind the pump along the rear wall surface is sufficiently weakened, the generation of an air suction vortex is also suppressed. As a result, it is possible to prevent violent vibration and loud noise from being generated from the pump during operation.

Further, the water flow immediately before flowing into the suction port collides with the baffle plate, so that the generation of the swirling flow is hindered and the generation of the underwater vortex is further suppressed.

Further, since the drilling process for forming a large number of through holes in the curved plate is not required, the vortex suppressing portion can be easily manufactured.

In the pump according to the second invention, the vortex suppressing portion has a partition member for partitioning the inside of the virtual cylinder including the curved plate.

According to this, the swirling of the water flow immediately before flowing into the suction port is further suppressed by the partition member. As a result, the generation of vortices can be further suppressed.

In the pump in the third invention, the vertical height of the partition member and the vertical height of the cylinder are substantially the same.

According to this, it becomes difficult for a long thread-like object mixed with water to wrap around the partition member.

In the pump in the fourth invention, the curved plate is curved in a semi-circular shape, and the curved plate is curved.
The baffle plate is a flat plate in the radial direction provided between both ends in the circumferential direction of the curved plate.
The partition member intersects the baffle plate in the radial direction of the virtual cylinder including the curved plate.

According to this, the water flow immediately before flowing into the suction port collides with the baffle plate, so that the generation of the swirling flow is hindered and the generation of the underwater vortex is suppressed.

The fifth invention is a vortex suppressing member that can be attached to a suction port of a pump body.
It has a cylinder with both upper and lower ends open and formed in a fan shape in a plan view, and a mounting portion for attaching the cylinder to the suction port.
Cylindrical body has a curved plate which is curved in an arc shape, as well as have a radial of the plate-shaped baffle plate provided between both ends in the circumferential direction of the curved plate, and closed around,
Mounting unit, as the upper end opening of the cylindrical body with a curved center of Te Bay curved plate viewed smell substantially coincides with the axis of the inlet is continuous to the lower part of the inlet, a cylindrical body the inlet It can be attached.

According to this, by joining the mounting portion to the suction port, the cylinder of the vortex suppressing member is attached to the suction port, and the inside of the cylinder communicates with the suction port.

The vortex suppressing member in the sixth invention has a partition member for partitioning the inside of a virtual cylinder including a curved plate.

In the vortex suppressing member in the seventh invention, the vertical height of the partition member and the vertical height of the cylinder are substantially the same.

In the vortex suppressing member in the eighth invention, the curved plate is curved in a semi-circular shape, and the curved plate is curved.
The baffle plate is a flat plate in the radial direction provided between both ends in the circumferential direction of the curved plate.
The partition member intersects the baffle plate in the radial direction of the virtual cylinder including the curved plate.

The ninth invention is a pump equipment provided with the pump according to any one of the first to fourth inventions above in the suction tank.
The suction port of the pump is provided in the water absorption tank and is on the front side of the rear wall surface of the water absorption tank.
The curved plate faces the rear wall surface of the water absorption tank.

As described above, according to the present invention, by operating the pump with the curved plate of the fan-shaped cylinder of the vortex suppressing portion facing the rear wall surface of the water absorption tank, the pump is sucked into the suction port from the rear wall surface side of the water absorption tank. The amount of water is less than the amount of water sucked into the suction port from the upstream side in front of the water suction tank, and the flow velocity of the water sucked into the suction port from the rear wall surface side of the water suction tank is the water sucked into the suction port from the upstream side in front of the water suction tank. It is kept lower than the flow velocity of. As a result, the swirling flow velocity of water near the suction port is sufficiently lower than the underwater vortex generation limit flow velocity. Further, the water flow immediately before flowing into the suction port collides with the baffle plate, so that the generation of the swirling flow is hindered. As a result, the generation of underwater vortices is suppressed.
In addition, since the flow descending from the back of the pump along the rear wall surface is weakened, the generation of air suction vortices is suppressed. As a result, it is possible to prevent violent vibration and loud noise from being generated from the pump during operation.

Further, since the drilling process for forming a large number of through holes in the curved plate is not required, the vortex suppressing portion can be easily manufactured, and the pump can be easily manufactured.

It is a side view of the pump in 1st Embodiment of this invention. It is an arrow view view of XX in FIG. It is the enlarged sectional view of the attachment part of the suction bell of a pump, and the vortex suppression member. It is the figure when the vortex suppressing member of a pump is seen from diagonally above. It is the figure when the vortex suppressing member of a pump is seen from diagonally below. It is a plan view of the vortex suppressing member of the pump. It is a vertical cross-sectional view of the vortex suppressing member of the pump. It is a cross-sectional view of the vortex suppressing member of the pump. It is a figure which shows the water flow and the approach flow velocity distribution in the water absorption tank at the time of operating a pump. It is a top view of the vortex suppressing member of a pump in 2nd Embodiment of this invention. It is the figure when the vortex suppressing member is seen from diagonally above. It is the figure when the vortex suppressing member is seen from diagonally below. It is a top view of the vortex suppressing member of a pump in 3rd Embodiment of this invention. It is the figure when the vortex suppressing member is seen from diagonally above. It is the figure when the vortex suppressing member is seen from diagonally below. It is a top view of the vortex suppressing member of a pump in 4th Embodiment of this invention. It is the figure when the vortex suppressing member is seen from diagonally above. It is the figure when the vortex suppressing member is seen from diagonally below. It is a cross-sectional view of the vortex suppressing member. It is a vertical sectional view of the vortex suppressing member. It is a top view of the vortex suppressing member of a pump in 5th Embodiment of this invention. It is the figure when the vortex suppressing member is seen from diagonally above. It is the figure when the vortex suppressing member is seen from diagonally below. It is a top view of the vortex suppressing member of a pump in 6th Embodiment of this invention. It is the figure when the vortex suppressing member is seen from diagonally above. It is the figure when the vortex suppressing member is seen from diagonally below. It is a schematic diagram of a conventional pump and a water absorption tank. FIG. 27 is a view taken along the line XX in FIG. 27. It is a graph showing the water flow and the near-flow velocity distribution in the water absorption tank when the pump is operating. It is a figure of the pump equipped with the conventional vortex prevention device. FIG. 30 is an arrow view of XX in FIG. It is a perspective view of the vortex prevention device.

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

(First Embodiment)
In the first embodiment, as shown in FIGS. 1 and 2, 10 is a pump facility installed in a pumping station, and the pump facility 10 is a water absorption tank 2 and rainwater or the like that has flowed into the water absorption tank 2. It has a pump 1 that sucks up water 3 and sends it to a treatment facility on the downstream side.

The water absorption tank 2 has a standard flow velocity open type, has a pair of left and right side wall surfaces 5, a rear wall surface 7, and a bottom surface 8, and water 3 flows in from the front upstream side 9.

The pump 1 is a vertical shaft pump and has a pump main body 11 and a vortex suppressing member 12. The pump main body 11 has a casing 14 extending in the vertical direction, a rotatable spindle 15 inserted in the casing 14, an impeller 16 that rotates together with the spindle 15, and a rotary drive device 17 that rotates the spindle 15. ing.

The casing 14 includes a straight tubular pumping pipe 19, a pump case 20 connected to the lower end of the pumping pipe 19, a suction bell 21 connected to the lower end of the pump case 20, and a discharge connected to the upper end of the pumping pipe 19. It has an elbow 22. As shown in FIGS. 1 and 3, the suction bell 21 has a suction port 23 and a flange 24 at the lower end thereof. The suction port 23 is provided in the water suction tank 2 and is on the front side (upstream side) of the rear wall surface 7.

As shown in FIGS. 4 to 7, the vortex suppressing member 12 is detachably attached to the suction port 23, and the cylinder 27 and the mounting flange 29 (mounting portion) for attaching the cylinder 27 to the suction port 23 are attached. An example) and.

The tubular body 27 has both upper and lower ends open and its periphery closed, and is formed in a semicircular shape (an example of a fan shape) in a plan view. The inside of the cylinder 27 communicates with the suction port 23. Further, the tubular body 27 has a curved plate 31 curved in a semi-circular shape (an example of an arc shape) and a flat plate-shaped baffle plate 32 having a diameter direction C provided between both ends of the curved plate 31 in the circumferential direction. is doing. The curved plate 31 is a closed plate and does not have a plurality of through holes through which water 3 passes.

Further, as shown in FIG. 7, the height h2 in the vertical direction of the curved plate 31 and the height h3 in the vertical direction of the baffle plate 32 are set to be substantially the same. The height h2 of the curved plate 31 and the height h3 of the baffle plate 32 may be the same.

The mounting flange 29 is an annular member having a plurality of screw holes 34, and is mounted over the upper end of the curved plate 31 and the upper ends of both ends of the baffle plate 32 in the radial direction. As shown in FIGS. 1 and 3, by joining the mounting flange 29 to the flange 24 of the suction bell 21 using a plurality of bolts 35, the vortex suppressing member 12 attaches the curved plate 31 to the rear wall surface of the water absorption tank 2. It is attached to the lower end of the suction bell 21, that is, the suction port 23 so as to face the 7.

As shown in FIG. 6, in a plan view, the curved center 38 of the curved plate 31 substantially coincides with the axial center 39 of the suction port 23 (see FIGS. 1 and 3). Further, as shown in FIGS. 3 and 8, the inner radius R1 of the curved plate 31 is set to be equal to or higher than the inner radius R2 of the suction port 23.

Further, as shown in FIG. 1, in a standard water absorption tank 2, the height H from the bottom surface 8 of the water absorption tank 2 to the suction port 23 is usually designed to be substantially the same as the diameter A of the pumping pipe 19. In that case, the height h in the vertical direction of the vortex suppressing member 12 is set to 30 to 70% of the height H from the bottom surface 8 to the suction port 23. In a water absorption tank that is not standard, the height H and the diameter A may be different.

Hereinafter, the operation in the above configuration will be described.

The graph G2 in FIG. 9 is a graph conceptually showing the state of the approach flow velocity distribution in the water suction tank 2 when the vortex suppressing member 12 is attached to the suction port 23. According to this, by operating the pump 1, the impeller 16 (see FIG. 1) rotates, the water 3 in the water suction tank 2 is sucked into the casing 14 from the suction port 23, and the discharge elbow 22 (see FIG. 1). See) and sent to the downstream processing facility. At this time, the curved plate 31 of the vortex suppressing member 12 passes from the upstream side near the water surface to the side of the casing 14 of the pump 1, descends from behind the casing 14 along the rear wall surface 7, and then reaches the suction port 23. It becomes a resistance to the sucked flows F1 and F1'.

Therefore, the velocity V1 of the flow F1 of the water 3 near the water surface becomes slow, the velocity of the descending flow F1 ′ descending from the back of the casing 14 along the rear wall surface 7 decreases, and the vorticity near the suction port 23 becomes high. Since it becomes smaller, the generation of underwater vortices is suppressed.

Further, the water 3 immediately before flowing into the suction port 23 collides with the baffle plate 32, so that the generation of the swirling flow is hindered and the generation of the underwater vortex is suppressed more effectively.

Further, as described above, the curved plate 31 of the vortex suppressing member 12 acts as a resistance to the downward flow F1 ′ descending from the back of the casing 14 along the rear wall surface 7, so that the curved plate 31 descends from the vicinity of the water surface on the front upstream side of the casing 14. As a result, the flow F3 sucked into the suction port 23 increases, and the downward flow F1'descending along the rear wall surface 7 from behind the casing 14 weakens, so that the generation of an air suction vortex is also suppressed. This makes it possible to prevent violent vibration and loud noise from being generated from the pump 1 during operation.

Further, since the drilling process for forming a large number of through holes in the curved plate 31 is not required, the vortex suppressing member 12 can be easily manufactured, and the pump 1 can be easily manufactured.

Further, as shown in FIG. 7, since the height h2 of the curved plate 31 and the height h3 of the baffle plate 32 are set to be substantially the same, a long thread-like object mixed in the water 3 is attached to the partition member 28. It becomes difficult to wrap.

(Second embodiment)
In the second embodiment, as shown in FIGS. 10 to 12, the tubular body 27 is formed in a fan shape having a central angle α of less than 180 ° (for example, 120 ° or the like) in a plan view. Further, the tubular body 27 has a curved plate 31 curved in an arc shape and a baffle plate 32 provided between both ends of the curved plate 31 in the circumferential direction. The baffle plate 32 is bent in a V shape at the curved center 38 of the curved plate 31. According to this, the same operation and effect as those of the first embodiment described above can be obtained.

(Third embodiment)
In the third embodiment, as shown in FIGS. 13 to 15, the tubular body 27 is formed in a fan shape having a central angle α exceeding 180 ° (for example, 240 °, etc.) in a plan view. .. Further, the tubular body 27 has a curved plate 31 curved in an arc shape and a baffle plate 32 provided between both ends of the curved plate 31 in the circumferential direction. The baffle plate 32 is bent in a V shape at the curved center 38 of the curved plate 31. According to this, the same operation and effect as those of the first embodiment described above can be obtained.

(Fourth Embodiment)
In the fourth embodiment, as shown in FIGS. 16 to 18, the partition member 28 is added to the vortex suppressing member 12 of the first embodiment. That is, the vortex suppressing member 12 is detachably attached to the suction port 23, and the tubular body 27, the partition member 28, and the mounting flange 29 for attaching the tubular body 27 to the suction port 23 (an example of the mounting portion). And have.

The tubular body 27 has both upper and lower ends open and its periphery closed, and is formed in a semicircular shape (an example of a fan shape) in a plan view. The inside of the cylinder 27 communicates with the suction port 23. Further, the tubular body 27 has a curved plate 31 curved in a semi-circular shape (an example of an arc shape) and a flat plate-shaped baffle plate 32 having a diameter direction C provided between both ends of the curved plate 31 in the circumferential direction. is doing. The curved plate 31 is a closed plate and does not have a plurality of through holes through which water 3 passes.

As shown in FIG. 19, the partition member 28 is a flat plate-shaped member that partitions the inside of a virtual cylinder 33 including a curved plate 31, and is orthogonal to the baffle plate 32 in the radial direction. As a result, the partition member 28 and the baffle plate 32 intersect in a cross shape in a plan view.

The front half of the partition member 28 projects to the front of the cylinder 27, and the rear half of the partition member 28 divides the inside of the cylinder 27 into two. Further, as shown in FIG. 20, the vertical height h1 of the partition member 28, the vertical height h2 of the curved plate 31, and the vertical height h3 of the baffle plate 32 are set to be the same or substantially the same. ing.

The mounting flange 29 is an annular member having a plurality of screw holes 34, and is an annular member, the upper ends of the curved plate 31, the upper ends of both ends of the baffle plate 32 in the radial direction, and the upper ends of both ends of the partition member 28 in the radial direction. It is attached over and over. As shown in FIGS. 1 and 3, by joining the mounting flange 29 to the flange 24 of the suction bell 21 using a plurality of bolts 35, the vortex suppressing member 12 attaches the curved plate 31 to the rear wall surface of the water absorption tank 2. It is attached to the lower end of the suction bell 21, that is, the suction port 23 so as to face the 7.

As shown in FIG. 16, in a plan view, the curved center 38 of the curved plate 31 substantially coincides with the axial center 39 of the suction port 23 (see FIGS. 1 and 3). Further, as shown in FIGS. 3 and 19, the inner radius R1 of the curved plate 31 is set to be equal to or higher than the inner radius R2 of the suction port 23.

According to this, the same operation and effect as those of the first embodiment described above can be obtained. Further, the turning of the water flow immediately before flowing into the suction port 23 is suppressed by the partition member 28. As a result, the generation of vortices can be further suppressed. Further, as shown in FIG. 20, since the height h1 of the partition member 28, the height h2 of the curved plate 31, and the height h3 of the baffle plate 32 are set to be the same or substantially the same, they are mixed with water 3. It becomes difficult for a long thread-like object to wind around the partition member 28.

(Fifth Embodiment)
In the fifth embodiment, as shown in FIGS. 21 to 23, the vortex suppressing member 12 of the second embodiment is provided with the partition member 28. The partition member 28 is a flat plate-shaped member that partitions the inside of a virtual cylinder (not shown) including the curved plate 31, and projects from the bent portion of the baffle plate 32 to the front (front upstream side) of the cylinder 27. .. According to this, the same operation and effect as those of the first embodiment described above can be obtained.

(Sixth Embodiment)
In the sixth embodiment, as shown in FIGS. 24 to 26, the vortex suppressing member 12 of the third embodiment is provided with the partition member 28. The partition member 28 is a flat plate-shaped member that divides the inside of the tubular body 27 into two, and is provided between the bent portion of the baffle plate 32 and the curved plate 31. According to this, the same operation and effect as those of the first embodiment described above can be obtained.

In each of the above embodiments, as shown in FIG. 1, a vertical axis pump is mentioned as an example of the pump 1, but the present invention is not limited to the vertical axis pump, and may be, for example, a horizontal axis pump or the like. Further, although the pump 1 that sucks up water 3 such as rainwater that has flowed into the water absorption tank 2 is mentioned, it is not limited to rainwater or the like.

In each of the above embodiments, as shown in FIG. 3, the vortex suppressing member 12 is detachably attached to the lower end of the suction bell 21 by using a bolt 35, but the vortex suppressing member 12 is attached to the suction bell 21 by welding or the like. It may be integrally attached to the lower end of the.

1 Pump 2 Water absorption tank 7 Rear wall surface 12 Vortex suppression member 23 Suction port 27 Cylindrical body 28 Partition member 29 Mounting flange (mounting part)
31 Curved plate 32 Baffle plate 33 Virtual cylinder 38 Curved center 39 Axial center h1 Partition member height h2 Curved plate height h3 Baffle plate height R1 Curved plate inner radius R2 Suction port inner radius

Claims (9)

A vortex suppression part is provided at the suction port,
The vortex suppressing portion has a tubular body having both upper and lower ends open and formed in a fan shape in a plan view.
The upper end opening of the cylinder is continuous with the lower part of the suction port, and the inside of the cylinder communicates with the suction port.
Cylindrical body has a curved plate which is curved in an arc shape, as well as have a radial of the plate-shaped baffle plate provided between both ends in the circumferential direction of the curved plate, and closed around,
In plan view, the curved center of the curved plate substantially coincides with the axis of the suction port.
A pump characterized in that the radius of the curved plate is equal to or greater than the radius of the suction port. The pump according to claim 1, wherein the vortex suppressing portion has a partition member for partitioning the inside of a virtual cylinder including a curved plate. The pump according to claim 2, wherein the vertical height of the partition member and the vertical height of the cylinder are substantially the same. The curved plate is curved in a semi-circular shape,
The baffle plate is a flat plate in the radial direction provided between both ends in the circumferential direction of the curved plate.
The pump according to claim 2 or 3, wherein the partition member intersects the baffle plate in the radial direction of the virtual cylinder including the curved plate. A vortex suppression member that can be attached to the suction port of the pump body.
It has a cylinder with both upper and lower ends open and formed in a fan shape in a plan view, and a mounting portion for attaching the cylinder to the suction port.
Cylindrical body has a curved plate which is curved in an arc shape, as well as have a radial of the plate-shaped baffle plate provided between both ends in the circumferential direction of the curved plate, and closed around,
Mounting unit, as the upper end opening of the cylindrical body with a curved center of Te Bay curved plate viewed smell substantially coincides with the axis of the inlet is continuous to the lower part of the inlet, a cylindrical body the inlet A vortex suppressing member characterized by being mountable. The vortex suppressing member according to claim 5, further comprising a partition member for partitioning the inside of a virtual cylinder including a curved plate. The vortex suppressing member according to claim 6, wherein the vertical height of the partition member and the vertical height of the cylinder are substantially the same. The curved plate is curved in a semi-circular shape,
The baffle plate is a flat plate in the radial direction provided between both ends in the circumferential direction of the curved plate.
The vortex suppressing member according to claim 6 or 7, wherein the partition member intersects the baffle plate in the radial direction of the virtual cylinder including the curved plate. A pump facility provided with the pump according to any one of claims 1 to 4 in the suction tank.
The suction port of the pump is provided in the water absorption tank and is on the front side of the rear wall surface of the water absorption tank.
Pump equipment characterized by the curved plate facing the rear wall surface of the water absorption tank.

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