JP6817137B2 - Vortex generation prevention device and pump equipment - Google Patents

Description

The present invention relates to a vortex generation prevention device for preventing vortex generation and a pump facility provided with the vortex generation prevention device.

In order to operate the pump in a stable state, it is important to ensure a uniform and less biased flow at the pump impeller inlet. The inlet flow of the pump depends on the shape of the suction tank. Flow phenomena that occur in the suction tank and lead to pump vibration, noise, and performance degradation include air suction vortices (Free-surface vortices), where air is intermittently or continuously sucked into the pump suction port from the water surface. Is on the bottom surface, side surface, or rear wall surface of the water tank, and the other end is a submerged vortices in the suction port.

In recent years, many studies have been conducted on the air suction vortex and the underwater vortex generated in the suction water tank. The centers of the air suction vortex and the underwater vortex always sway, and the strength of the vortex often fluctuates greatly with time. Such a vortex is extremely unstable and has a strong non-stationary flow.

Japanese Unexamined Patent Publication No. 2017-25855

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vortex generation prevention device for preventing the generation of vortices in a suction water tank.
Furthermore, an object of the present invention is to provide a pump facility provided with the above-mentioned vortex generation prevention device.

One aspect is a device for preventing the generation of a vortex around a pump in the suction water tank, the first bending surface for changing the direction of the liquid flow in the suction water tank to the first direction, and the first bending. A first vortex prevention structure having both ends formed on both sides of the surface, a second bent surface that changes the direction of the liquid flow in a second direction opposite to the first direction, and the first. The second vortex prevention structure is provided with both ends formed on both sides of the two bent surfaces, and the first bent surface and the second bent surface face each other, and the first vortex prevention structure is provided. One of both ends of the body is arranged between both ends of the second vortex prevention structure.

A preferred embodiment is characterized in that each of the first bent surface and the second bent surface has an arc shape, a V shape, or a U shape.
A preferred embodiment is characterized in that the first vortex prevention structure and the second vortex prevention structure can be arranged below the suction port of the pump and at least one side of the pump.
A preferred embodiment is characterized in that the first vortex prevention structure and the second vortex prevention structure can form a part of a strainer attached to a suction port of the pump.
A preferred embodiment is further provided with a connecting member that connects the first vortex prevention structure and the second vortex prevention structure to each other.
In a preferred embodiment, the connecting member is composed of a member that can move up and down according to the height of the liquid level of the suction water tank, and the first vortex prevention structure and the second vortex prevention structure are the same. It is characterized in that it is arranged below the connecting member.

Another aspect comprises a suction water tank, a pump arranged in the suction water tank, and a device for preventing the generation of vortices around the pump, wherein the device directs the flow of liquid in the suction water tank. The first vortex prevention structure including the first bent surface that converts to the first direction and both ends formed on both sides of the first bent surface, and the direction of the liquid flow are referred to as the first direction. A second vortex prevention structure including a second bent surface that converts in the opposite second direction and both ends formed on both sides of the second bent surface is provided, and the first bent surface and the said The second bent surfaces face each other, and one of both ends of the first vortex prevention structure is arranged between both ends of the second vortex prevention structure. It is a pump facility.

A preferred embodiment is characterized in that each of the first bent surface and the second bent surface has an arc shape, a V shape, or a U shape.
A preferred embodiment is characterized in that the first vortex prevention structure and the second vortex prevention structure are arranged below the suction port of the pump and at least one of the sides of the pump.
In a preferred embodiment, the pump includes a strainer attached to its suction port, and the first vortex prevention structure and the second vortex prevention structure form a part of the strainer. It is a feature.
A preferred embodiment is further provided with a connecting member that connects the first vortex prevention structure and the second vortex prevention structure to each other.
In a preferred embodiment, the connecting member is composed of a member that can move up and down according to the height of the liquid level of the suction water tank, and the first vortex prevention structure and the second vortex prevention structure are the same. It is characterized in that it is arranged below the connecting member.

The direction of liquid flow in the suction water tank is changed to the first direction by the first bent surface, and further changed to the second direction opposite to the first direction by the second bent surface. Therefore, the swirling flow that triggers the generation of the vortex is canceled, and as a result, the generation of the vortex in the suction water tank can be prevented.

It is the schematic of one Embodiment of a pump equipment. It is a figure which shows the plurality of vortex generation prevention devices arranged in a suction water tank. It is a perspective view of the vortex generation prevention device. It is a figure seen from the A line direction of FIG. It is a figure seen from the B line direction of FIG. It is a figure which shows the plurality of vortex generation prevention devices arranged in series. It is a figure which shows the plurality of vortex generation prevention devices arranged in series. It is a figure which shows the deformation example of a bent surface. It is a figure which shows the other deformation example of a bent surface. It is a figure which shows the other embodiment of the vortex generation prevention device. It is a figure which shows the other embodiment of a pump equipment. It is a horizontal sectional view of the pump equipment of FIG. It is a figure which shows still another embodiment of a pump equipment. It is a figure which shows still another embodiment of a pump equipment. It is a figure which shows the horizontal cross section of the pump equipment of FIG. It is a figure which shows still another embodiment of a pump equipment. It is a figure which shows the horizontal cross section of the pump equipment of FIG. It is a figure which shows still another embodiment of a pump equipment. It is a figure which shows the horizontal cross section of the pump equipment of FIG. It is a figure which shows still another embodiment of a pump equipment. It is a figure which shows the horizontal cross section of a strainer.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding components are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a schematic view of an embodiment of the pump equipment 20. The arrow in FIG. 1 indicates the flow direction of the liquid in the suction water tank 90. The pump equipment 20 prevents the generation of vortices around the suction water tank 90, the vertical shaft pump 30 arranged in the suction water tank 90, the prime mover 39 for operating the vertical shaft pump 30, and the vertical shaft pump 30 in the suction water tank 90. It is provided with a vortex generation prevention device 40.

In the present embodiment, the pump equipment 20 includes a vertical axis pump 30, but the present embodiment is not limited to this embodiment, and a horizontal axis pump or a submersible pump may be provided. Hereinafter, in the present specification, the vertical shaft pump 30 may be simply referred to as a pump 30.

The pump 30 includes a suspension pipe 31 suspended in the suction water tank 90, a pump bowl 32 connected to the suspension pipe 31, a suction bell mouth 33 in which the liquid in the suction water tank 90 is sucked, and a suspension pipe 31. It includes a rotating shaft 34 arranged inside, an outer bearing 35 and an underwater bearing 36 that support the rotating shaft 34, and an impeller 37 fixed to the rotating shaft 34.

The lower end of the rotating shaft 34 extending in the vertical direction is fixed to the impeller 37, and the upper end of the rotating shaft 34 is connected to the prime mover 39 installed on the prime mover base 39a. The impeller 37 is housed in a pump casing composed of a pump bowl 32 and a suction bell mouth 33. The suspension pipe 31 extends downward through a pump installation hole 92 formed in the pump installation floor 91 above the suction water tank 90.

When the prime mover 39 is driven, the driving force is transmitted to the rotary shaft 34 and the impeller 37, and the rotary shaft 34 and the impeller 37 are rotated by the prime mover 39. The suction bell mouth 33 is formed with a liquid suction port. The liquid in the suction water tank 90 is sucked from the suction port of the suction bell mouth 33 by the rotation of the impeller 37, and is transferred to the outside of the pump equipment 20 through the suspension pipe 31.

In the present embodiment, the vortex generation prevention device 40 is arranged on the bottom wall 90a and the side wall 90b of the suction water tank 90. The bottom wall 90a is a portion constituting the bottom surface of the suction water tank 90, and the side wall 90b of the suction water tank 90 is a portion constituting the rear wall surface of the suction water tank 90 and at least one of both side surfaces of the rear wall surface.

In FIG. 1, the vortex generation prevention device 40 is schematically shown (see shading in FIG. 1). The vortex generation prevention device 40 arranged on the bottom wall 90a of the suction water tank 90 is located below the suction bell mouth 33 and extends parallel to the bottom wall 90a. The vortex generation prevention device 40 arranged on the side wall 90b of the suction water tank 90 is separated from the side of the pump 30 (more specifically, the pump casing), that is, the pump 30, and extends in parallel with the side wall 90b. There is.

In one embodiment, the vortex generation prevention device 40 may be arranged on at least one of the bottom wall 90a and the side wall 90b. In another embodiment, the vortex generation prevention device 40 may be arranged below the liquid level of the suction water tank 90 and above the suction port of the suction bell mouth 33. In this case, the vortex generation prevention device 40 may extend from the side wall 90b in parallel with the liquid level of the suction water tank 90. In still another embodiment, the vortex generation prevention device 40 may be arranged on the downstream side of the pump 30, that is, on the side wall 90b side of the center line RL of the pump 30 in the liquid flow direction.

FIG. 2 is a diagram showing a plurality of (innumerable) vortex generation prevention devices 40 arranged in the suction water tank 90. The arrow in FIG. 2 indicates the flow direction of the liquid in the suction water tank 90. In FIG. 2, only the innumerable vortex generation prevention devices 40 arranged on the bottom wall 90a of the suction water tank 90 are shown. Hereinafter, the vortex generation prevention device 40 arranged on the bottom wall 90a will be described with reference to FIG.

As shown in FIG. 2, in the present embodiment, the vortex generation prevention device 40 is arranged over the entire bottom wall 90a of the suction water tank 90. In one embodiment, the vortex generation prevention device 40 may be arranged on a part of the bottom wall 90a of the suction water tank 90. For example, the vortex generation prevention device 40 may be arranged at the specified position by specifying the vortex generation location.

FIG. 3 is a perspective view of the vortex generation prevention device 40. In FIG. 3, a single vortex generation prevention device 40 is drawn. As shown in FIG. 3, the vortex generation prevention device 40 includes a vortex prevention structure 41 and a vortex prevention structure 42. The pair of vortex prevention structures 41 and 42 can form flows in different directions of rotation of the liquid to prevent the generation of vortices. These vortex prevention structures 41 and 42 may be called a flow direction changing device for changing the flow direction of the liquid.

The vortex prevention structure 41 includes a bent surface 41a that changes the direction of the flow of liquid in the suction water tank 90 in the direction D1, and both end portions 41b and 41b formed on both sides of the bent surface 41a. The vortex prevention structure 42 includes a bent surface 42a that changes the direction of the converted liquid flow in the direction D2 opposite to the direction D1, and both end portions 42b and 42b formed on both sides of the bent surface 42a. There is.

Each of the bent surfaces 41a and 42a has an arc shape (semicircular shape), and the bent surfaces 41a and 42a face each other. One of both ends 41b and 41b of the vortex prevention structure 41 is arranged between both end portions 42b and 42b of the vortex prevention structure 42. In other words, any one of both end portions 42b, 42b of the vortex prevention structure 42 may be arranged between both end portions 41b, 41b of the vortex prevention structure 41.

With such an arrangement, the bent surfaces 41a and 42a of the vortex prevention structures 41 and 42 form a flow path that changes the flow direction of the liquid. In this embodiment, this flow path has an S-shape. Therefore, the liquid flowing in from the space between the ends 41b and 42b travels in the S-shaped flow path formed by the bent surfaces 41a and 42a while the direction of the flow is changed.

A vortex such as an air suction vortex (water surface vortex) or an underwater vortex is caused by a swirling flow of liquid generated in the suction water tank 90. According to the present embodiment, the direction of the liquid flow is changed to the direction D1 so as to draw an arc shape by the bending surface 41a, and further changed to the second direction so as to draw an arc shape by the bending surface 42a. In this way, since the vortex prevention structures 41 and 42 are alternately arranged so that their bent surfaces 41a and 42a face each other, the swirling flow that triggers the generation of the vortex is always canceled. As a result, the vortex generation prevention device 40 can prevent the generation of vortices in the suction water tank 90.

The preferable arrangement of the vortex prevention structures 41 and 42 will be described. FIG. 4 is a view seen from the direction of line A in FIG. FIG. 5 is a view seen from the direction of line B of FIG. As shown in FIG. 4, the end portion 41b of the vortex prevention structure 41 is preferably arranged on the center line CL1 of the bent surface 42a of the vortex prevention structure 42. The center line CL1 is a line segment passing through the most recessed position of the bent surface 42a (that is, the intermediate position of the distance between both end portions 42b and 42b).

Similarly, the end portion 42b of the vortex prevention structure 42 is preferably arranged on the center line CL2 of the bent surface 41a of the vortex prevention structure 41. The center line CL2 is a line segment passing through the most recessed position of the bent surface 41a (that is, the intermediate position of the distance between both end portions 41b and 41b).

If the flow path is formed by the vortex prevention structures 41 and 42, the end portion 41b may be arranged closer to either of both end portions 42b and 42b than the center line CL1. In other words, the end portion 42b may be arranged closer to either end portion 41b or 41b than the center line CL2.

It is preferable that both end portions 41b, 41b of the vortex prevention structure 41 and both end portions 42b, 42b of the vortex prevention structure 42 are arranged on a straight line SL. This straight line SL is a line segment passing through the center of the vortex generation prevention device 40. If the flow path is formed by the vortex prevention structures 41, 42, the end portions 41b, 42b may be arranged closer to the bent surfaces 42a, 41a than the straight SL, and the bent surfaces 42a, 42a, closer to the straight SL. It may be arranged apart from 41a.

As shown in FIG. 5, the distance T1 from the upper end to the lower end of the vortex prevention structure 41 (that is, the height of the vortex prevention structure 41) is the distance T1 between both ends 41b and 41b of the vortex prevention structure 41. It is preferably equal to'(T1 = T1'). The vortex prevention structure 42 is the same as the vortex prevention structure 41. The size of the bent surfaces 41a and 42a of the vortex prevention structures 41 and 42 (more specifically, the above-mentioned distance T1') is the size of the swirling flow that triggers the generation of the vortex (more specifically, the swirling flow). It is desirable that it is larger than the size of the center of.

The sizes of the vortex prevention structures 41 and 42 are determined based on various conditions such as the size of the vortex that can be generated, the size of the suction water tank 90, and the size of the pump 30. Preferably, the size of the anti-vortex structures 41, 42 is in the range of 1 cm to 30 cm. When the vortex generation prevention device 40 is arranged on the bottom wall 90a of the suction water tank 90 (see FIG. 1), the distance T1 of the vortex prevention structure 41 (and the vortex prevention structure 42) is the bottom wall 90a and the suction bell mouth. It is smaller than the distance from the lower surface of 33. When the vortex generation prevention device 40 is arranged on the side wall 90b of the suction water tank 90 (see FIG. 1), the distance T1 of the vortex prevention structure 41 (and the vortex prevention structure 42) is set between the side wall 90b and the side surface of the pump 30. Less than the distance between.

6 and 7 are views showing a plurality of vortex generation prevention devices 40 arranged in series. As shown in FIG. 6, a plurality of vortex generation prevention devices 40 (in the embodiment shown in FIG. 6, two vortex generation prevention devices 40) are arranged in series and separated from each other. If the flow path is formed by the plurality of vortex generation prevention devices 40, the distances between the vortex prevention structures 41 and 42 adjacent to each other are not particularly limited. Although not shown, these plurality of vortex generation prevention devices 40 may be arranged in parallel.

As shown in FIG. 7, a plurality of vortex generation prevention devices 40 adjacent to each other may be connected. More specifically, the ends 41a, 41a of the vortex prevention structures 41, 41 adjacent to each other are connected, and the ends 42a, 42a of the vortex prevention structures 42, 42 adjacent to each other are connected. The vortex prevention structures 41, 41 (and the vortex prevention structures 42, 42) may be integrally molded members or may be separate members.

In one embodiment, the plurality of vortex generation prevention devices 40 are fixed on the bottom wall 90a of the suction water tank 90. In another embodiment, a groove for arranging a plurality of vortex generation prevention devices 40 may be formed in the bottom wall 90a of the suction water tank 90, and a plurality of vortex generation prevention devices 40 may be arranged in the groove. These vortex prevention structures 41 and 42 may be made of a heavy object such as metal. The same applies when a plurality of vortex generation prevention devices 40 are arranged on the side wall 90b of the suction water tank 90, and thus detailed description thereof will be omitted.

In the present embodiment, the plurality of vortex generation prevention devices 40 are arranged along the flow direction of the liquid (see FIG. 2). In one embodiment, the vortex generation prevention device 40 may be arranged in a direction that crosses the flow direction of the liquid. In another embodiment, a part of the plurality of vortex generation prevention devices 40 may be arranged along the liquid flow direction, and the remaining vortex generation prevention device 40 may be arranged in a direction crossing the liquid flow direction. .. That is, a plurality of vortex generation prevention devices 40 may be randomly arranged. The same applies when a plurality of vortex generation prevention devices 40 are arranged on the side wall 90b of the suction water tank 90. The plurality of vortex generation prevention devices 40 may be arranged along the height direction of the suction water tank 90, or may be arranged in the width direction.

FIG. 8 is a diagram showing a modified example of the bent surfaces 41a and 42a. As shown in FIG. 8, the bent surfaces 41a and 42a may have a V shape. In the present embodiment, the angles formed by the bent surfaces 41a and 42a are 90 degrees, respectively.

FIG. 9 is a diagram showing another modified example of the bent surfaces 41a and 42a. As shown in FIG. 9, the bent surfaces 41a and 42a may have a U-shape. In the embodiments shown in FIGS. 8 and 9, the same effects as those in the above-described embodiment can be obtained. In the embodiment shown in FIGS. 8 and 9, the vortex generation prevention devices 40 adjacent to each other are arranged apart from each other. Similar to the embodiment of FIG. 7, these vortex generation prevention devices 40 may be connected.

FIG. 10 is a diagram showing another embodiment of the vortex generation prevention device 40. As shown in FIG. 10, the vortex generation prevention device 40 may further include a connecting member 45 that connects the vortex prevention structure 41 and the vortex prevention structure 42 to each other. In the present embodiment, the connecting member 45 is a plate-shaped base member to which the lower ends of the vortex prevention structures 41 and 42 are fixed. In the present embodiment, the connecting member 45 can determine the relative positions of the vortex prevention structures 41 and 42. The vortex prevention structures 41, 42 and the connecting member 45 may be integrally molded members or may be separate members.

In one embodiment, the connecting member 45 may be made of a heavy object such as metal. With such a configuration, the vortex generation prevention device 40 sinks to the bottom wall 90a of the suction water tank 90 due to the weight of the connecting member 45, and the vortex prevention structures 41 and 42 pass through the connecting member 45 to the bottom wall of the suction water tank 90. It is placed on 90a. According to the present embodiment, the vortex generation prevention device 40 can be easily arbitrarily used while determining the relative positions of the vortex prevention structures 41 and 42 by a simple method of throwing the vortex generation prevention device 40 from the land into the suction water tank 90. Can be placed in the location of.

In another embodiment, the connecting member 45 is composed of a lightweight member such as styrofoam mixed with air, and the vortex prevention structures 41 and 42 are fixed to the lower surface of the connecting member 45. With such a configuration, the connecting member 45 floats on the liquid surface of the suction water tank 90 due to its buoyancy, and the vortex prevention structures 41 and 42 are arranged below the connecting member 45. The vortex prevention structures 41 and 42 are arranged below (directly below) the liquid level of the suction water tank 90 and above the suction port of the suction bell mouth 33. As a result, the swirling flow that triggers the generation of the water surface vortex is always canceled, and the generation of the vortex (particularly, the water surface vortex) in the water tank 90 can be prevented.

The plurality of vortex generation prevention devices 40 may be arranged both on the bottom wall 90a of the suction water tank 90 and directly below the liquid level of the suction water tank 90. With such a configuration, the vortex generation prevention device 40 can more effectively prevent the generation of underwater vortices and the generation of water surface vortices.

The connecting member that determines the relative positions of the vortex prevention structures 41 and 42 may be a wire that penetrates the vortex prevention structures 41 and 42. Even if the vortex prevention structures 41 and 42 are connected by wires, the relative positions of the vortex prevention structures 41 and 42 can be determined. In this embodiment, both ends of the wire may be connected to the side wall 90b of the suction water tank 90. With such a configuration, the vortex prevention structures 41 and 42 can be suspended from the suction water tank 90.

FIG. 11 is a diagram showing another embodiment of the pump equipment 20. FIG. 12 is a horizontal sectional view of the pump equipment 20 of FIG. In FIGS. 11 and 12, the vortex generation prevention device 40 is schematically depicted. In FIGS. 11 and 12, the connecting member 45 is in contact with the side wall 90b of the suction water tank 90, but may be separated from the side wall 90b.

The pump equipment 20 is provided with a pillar 50 extending upward from the bottom wall 90a of the suction water tank 90, that is, in the height direction of the suction water tank 90. In the present embodiment, the vortex generation prevention device 40 includes a connecting member 45 as a base member (see FIG. 10). The connecting member 45 is formed with a through hole 45a through which the pillar 50 penetrates and a through hole 45b through which the suspension pipe 31 of the pump 30 penetrates.

In one embodiment, the connecting member 45 may be fixed to the pillar 50. In another embodiment, the connecting member 45 may be connected so as to be vertically movable along the axial direction of the pillar 50, that is, the height direction of the suction water tank 90. In this case, the vortex prevention structures 41 and 42 may be moved up and down via the connecting member 45 by an elevating device (not shown). As long as the vortex prevention structures 41 and 42 are raised and lowered, the configuration of the raising and lowering device is not particularly limited. Hereinafter, a configuration example of the elevating device will be described.

As the first configuration, the elevating device includes a link mechanism (for example, a pantograph structure) connected to the bottom wall 90a of the suction water tank 90 and the connecting member 45, and a drive for moving the connecting member 45 in the vertical direction via the link mechanism. It may be provided with a device. The drive device moves the connecting member 45 up and down via the link mechanism by the drive, and raises and lowers the vortex prevention structures 41 and 42 together with the connecting member 45.

As a second configuration, the elevating device may include an elevating motor and a ball screw. The connecting member 45 is connected to a ball screw extending in the vertical direction, and can move up and down by driving an elevating motor. The elevating motor moves the connecting member 45 up and down via the ball screw by its drive, and moves the vortex prevention structures 41 and 42 up and down together with the connecting member 45.

As a third configuration, the elevating device may include a drive motor, a sprocket connected to the drive motor, and a roller chain connected to the drive motor via the sprocket. The connecting member 45 is connected to a roller chain extending in the vertical direction. By its drive, the drive motor moves the connecting member 45 up and down via the sprocket and the roller chain, and moves the vortex prevention structures 41 and 42 up and down together with the connecting member 45.

The connecting member 45 may be composed of a lightweight member such as Styrofoam mixed with air. With such a configuration, the vortex generation prevention device 40 can move up and down according to the height of the liquid level of the suction water tank 90.

As shown in FIG. 12, the connecting member 45 may be connected to the suspension pipe 31 of the pump 30 via a plurality of connecting tools 51. These plurality of connecting tools 51 are arranged at equal intervals along the circumferential direction of the suspension pipe 31. The number of connectors 51 is not limited to this embodiment.

The connecting member 45 may be composed of the split bodies 46 and 47 that can be split. The split body 46 is arranged on the upstream side of the pump 30 in the liquid flow direction, and the split body 47 is arranged on the downstream side of the pump 30 in the liquid flow direction. By configuring the connecting member 45 from the split bodies 46 and 47 that can be divided at the center thereof, the vortex generation prevention device 40 can be easily attached to the pump 30 while the pump 30 is arranged in the suction water tank 90. Further, the pump 30 can be easily removed from the suction water tank 90.

A guide portion 52 to be inserted into the insertion portion 45c formed in the connecting member 45 is formed on the side wall 90b of the suction water tank 90. The insertion portion 45c has a concave shape, and the guide portion 52 has a convex shape corresponding to the shape of the insertion portion 45c. The guide portion 52 extends in the height direction of the suction water tank 90, and is provided on the side wall 90b facing each other via the connecting member 45.

In order to limit the movement of the connecting member 45 in the vertical direction (that is, the height direction of the suction water tank 90), the connecting member 45 may be movably connected to the guide portion 52, or may be immovably guided. It may be fixed to the portion 52. Although not shown, the guide portion 52 may have a concave shape extending in the height direction of the side wall 90b of the suction water tank 90. In this case, the insertion portion 45c has a convex shape corresponding to the shape of the guide portion 52.

According to the present embodiment, the vortex generation prevention device 40 can be arranged only on the upstream side of the pump 30 by connecting the split body 46 to the guide portion 52 and removing the split body 47. By connecting the split body 47 to the pillar 50 and removing the split body 46, the vortex generation prevention device 40 can be arranged only on the downstream side of the pump 30.

In the embodiment shown in FIG. 12, a plurality of configurations (that is, a configuration in which the pillar 50 is provided, a configuration in which the connecting member 45 is composed of the divided bodies 46 and 47, a configuration in which the connecting tool 51 is provided, a guide portion 52 and an insertion portion 45c are provided. Configuration) exists in a complex manner, but these configurations can be appropriately selected according to the pump equipment 20.

FIG. 13 is a diagram showing still another embodiment of the pump equipment 20. As shown in FIG. 13, a foreign matter accumulating portion 90c may be provided on the bottom wall 90a of the suction water tank 90. The foreign matter accumulating portion 90c is formed below the suction bell mouth 33, and the upper surface of the foreign matter accumulating portion 90c is located below the upper surface of the bottom wall 90a. The vortex generation prevention device 40 is arranged above the foreign matter accumulating portion 90c so as to cover the foreign matter accumulating portion 90c.

The foreign matter collecting portion 90c can collect foreign matter such as sand on the bottom wall 90a of the suction water tank 90. The vortex prevention structures 41 and 42 are connected by a connecting member (perforated member or wire) that allows foreign matter to move to the foreign matter accumulating portion 90c. With such a configuration, the foreign matter on the bottom wall 90a passes through the vortex generation prevention device 40 and is collected in the foreign matter accumulation portion 90c below the vortex generation prevention device 40. In the present embodiment, the vortex generation prevention device 40 can fully exert its function even in an environment where a large amount of foreign matter such as the sea is present.

FIG. 14 is a diagram showing still another embodiment of the pump equipment 20. FIG. 15 is a diagram showing a horizontal cross section of the pump equipment 20 of FIG. As shown in FIGS. 14 and 15, the pump equipment 20 further includes a splitter 55 for reducing a flow such as a swirling flow or a drift flow in the suction water tank 90. The splitter 55 is arranged on the side of the pump 30, and extends upward from the bottom wall 90a of the suction water tank 90, that is, in the height direction of the suction water tank 90. The splitter 55 is also connected to the side wall 90b of the suction water tank 90. The horizontal cross section of the splitter 55 has a trapezoidal shape in which the tip of the splitter 55 becomes thinner toward the pump 30. However, the horizontal cross section of the splitter 55 does not necessarily have to have a trapezoidal shape.

The vortex generation prevention device 40 is mounted on the splitter 55. In the present embodiment, the vortex generation prevention device 40 is attached to both side surfaces of the splitter 55. Since the splitter 55 and the vortex generation prevention device 40 are provided, the pump equipment 20 can not only prevent the generation of vortices but also reduce the flow such as swirling flow and drift flow, and the pump 30 Can contribute to stable operation of.

FIG. 16 is a diagram showing still another embodiment of the pump equipment 20. FIG. 17 is a diagram showing a horizontal cross section of the pump equipment 20 of FIG. As shown in FIGS. 16 and 17, the pump equipment 20 further includes a splitter 58 extending parallel to the bottom wall 90a of the suction water tank 90. The splitter 55 is located to the side of the pump 30, and the splitter 58 is located below the suction bell mouth 33. The splitter 58 has a trapezoidal shape whose tip becomes thinner toward the pump 30. However, the horizontal cross section of the splitter 58 does not necessarily have to have a trapezoidal shape.

The plurality of vortex generation prevention devices 40 are attached to the side surfaces of the splitters 55 and 58, and extend in the longitudinal direction of the splitters 55 and 58. In FIG. 17, the vortex generation prevention device 40 is not shown.

FIG. 18 is a diagram showing still another embodiment of the pump equipment 20. FIG. 19 is a diagram showing a horizontal cross section of the pump equipment 20 of FIG. As shown in FIGS. 18 and 19, the pump equipment 20 is provided with side pillars 56 extending upward from the bottom wall 90a of the suction water tank 90. The side pillars 56 are connected to the side wall 90b of the suction water tank 90, are provided on both side walls 90b of the suction water tank 90, and are arranged on the downstream side of the pump 30 with respect to the center line RL of the pump 30. The vortex generation prevention device 40 is attached to the side surface of the side pillar 56.

FIG. 20 is a diagram showing still another embodiment of the pump equipment 20. In the present embodiment, the pump 30 further includes a strainer 60 attached to its suction port (more specifically, the lower surface of the suction bell mouth 33). The strainer 60 is provided to regulate the flow of the liquid sucked from the suction port of the pump 30, and can also capture foreign matter existing in the liquid of the suction water tank 90.

FIG. 21 is a diagram showing a horizontal cross section of the strainer 60. As shown in FIG. 21, the strainer 60 includes a main frame 60a attached to the lower surface of the suction bell mouth 33 and a reinforcing frame 60b for reinforcing the main frame 60a. The reinforcing frame 60b has a cross-shaped shape and is hung between the main frames 60a.

The reinforcing frame 60b does not necessarily have to have a cross shape, and the shape is not particularly limited. The number of reinforcing frames 60b is not particularly limited, and at least one reinforcing frame 60b may be provided. If the strength of the strainer 60 is ensured, it is not always necessary to provide the reinforcing frame 60b.

In the present embodiment, the plurality of vortex generation prevention devices 40 (that is, the vortex prevention structures 41 and 42) are attached to these frames 60a and 60b, and a part of the strainer 60 (more specifically, the strainer 60). Side and bottom).

In the present embodiment, the vortex generation prevention devices 40 adjacent to each other are connected (see FIG. 7) and are connected to the frames 60a and 60b. In one embodiment, the vortex generation prevention device 40 may be connected by a wire as a connecting member.

As described above, both the underwater vortex and the water surface vortex are connected to the suction port of the pump 30. According to the present embodiment, since the vortex generation prevention device 40 constitutes the side surface and the lower surface of the strainer 60, the liquid sucked into the pump 30 always passes through the strainer 60 provided with the vortex generation prevention device 40. To do. Therefore, the vortex generation prevention device 40 can always cancel the swirling flow that triggers the generation of vortices (underwater vortex and water surface vortex).

In the embodiment shown in FIGS. 20 and 21, since the vortex generation prevention device 40 also serves as a net for capturing foreign matter, the vortex generation prevention device 40 captures foreign matter existing in the liquid of the suction water tank 90. Can be done. Therefore, the vortex generation prevention device 40 can not only remove the generated vortex but also remove the foreign matter in the liquid. By providing the vortex generation prevention device 40 in the strainer 60, it is possible to eliminate the need for installation work of the vortex generation prevention device 40 in the suction water tank 90, and it is possible to reduce the cost required for this installation work.

In one embodiment, a net for catching foreign matter may be arranged on the frames 60a and 60b of the strainer 60, and the vortex generation prevention device 40 may be arranged on the net. With such a configuration, the strength of the strainer 60 can be further improved.

Although the embodiments of the present invention have been described so far, it is needless to say that the present invention is not limited to the above-described embodiments and may be implemented in various different forms within the scope of the technical idea.

20 Pump equipment 30 Pump 31 Suspension pipe 32 Pump bowl 33 Suction bell mouth 34 Rotating shaft 35 External bearing 36 Submersible bearing 37 Impeller 39 Motor 39a Motor base 40 Swirl prevention device 41, 42 Swirl prevention structure 41a, 42a Bent surface 41b, 42b End 45 Connection member 45a, 45b Through hole 45c Insertion part 46,47 Split body 50 Pillar 51 Connector 52 Guide part 55, 58 Splitter 56 Side pillar 60 Strainer 60a Main frame 60b Reinforcement frame 90 Suction water tank 90a Bottom wall 90b Side wall 90c Foreign matter accumulation part 91 Pump installation floor 92 Pump installation hole

Claims (12)

A device that prevents the generation of vortices around the pump in the suction water tank.
A first vortex prevention structure including a first bent surface that changes the direction of liquid flow in the suction water tank to the first direction, and both ends formed on both sides of the first bent surface.
A second vortex prevention structure including a second bent surface that changes the direction of the liquid flow in a second direction opposite to the first direction, and both ends formed on both sides of the second bent surface. With and
The first bent surface and the second bent surface are opposed to each other.
A device characterized in that one of both ends of the first vortex prevention structure is arranged between both ends of the second vortex prevention structure. The apparatus according to claim 1, wherein each of the first bent surface and the second bent surface has an arc shape, a V shape, and a U shape. The first or second vortex prevention structure according to claim 1 or 2, wherein the first vortex prevention structure and the second vortex prevention structure can be arranged below the suction port of the pump and at least one of the sides of the pump. Equipment. The first vortex prevention structure and the second vortex prevention structure can form a part of a strainer attached to a suction port of the pump, according to any one of claims 1 to 3. The device described. The device according to any one of claims 1 to 4, further comprising a connecting member for connecting the first vortex prevention structure and the second vortex prevention structure to each other. The connecting member is composed of a member that can move up and down according to the height of the liquid level of the suction water tank.
The device according to claim 5, wherein the first vortex prevention structure and the second vortex prevention structure are arranged below the connecting member. Suction water tank and
The pump arranged in the suction water tank and
A device for preventing the generation of vortices around the pump is provided.
The device
A first vortex prevention structure including a first bent surface that changes the direction of liquid flow in the suction water tank to the first direction, and both ends formed on both sides of the first bent surface.
A second vortex prevention structure including a second bent surface that changes the direction of the liquid flow in a second direction opposite to the first direction, and both ends formed on both sides of the second bent surface. And have
The first bent surface and the second bent surface are opposed to each other.
A pump facility characterized in that one of both ends of the first vortex prevention structure is arranged between both ends of the second vortex prevention structure. The pump equipment according to claim 7, wherein each of the first bent surface and the second bent surface has an arc shape, a V shape, and a U shape. The seventh or eighth aspect of the present invention, wherein the first vortex prevention structure and the second vortex prevention structure are arranged below the suction port of the pump and at least one of the sides of the pump. Pump equipment. The pump is equipped with a strainer attached to its suction port.
The pump equipment according to any one of claims 7 to 9, wherein the first vortex prevention structure and the second vortex prevention structure form a part of the strainer. The pump equipment according to any one of claims 7 to 10, further comprising a connecting member for connecting the first vortex prevention structure and the second vortex prevention structure to each other. The connecting member is composed of a member that can move up and down according to the height of the liquid level of the suction water tank.
The pump equipment according to claim 11, wherein the first vortex prevention structure and the second vortex prevention structure are arranged below the connecting member.

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