JP2022006607A - Vertical shaft pump - Google Patents

Abstract

To efficiently decrease a temperature of cooling water for cooling a heat generating device.SOLUTION: A vertical shaft pump 10 includes: a cylindrical pump casing 12 whose lower parts 15, 16 are disposed in a water suction tank 1; and a cooling device 35 for cooling a heat generating device 26 by circulating cooling water. The cooling device 35 includes a movable member 47 disposed on an outer side of the lower parts 15, 16 of the pump casing 12 and movable in a radial direction while centering on the pump casing 12. The movable member 47 includes a water pipe 48 capable of flowing cooling water therethrough.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vertical shaft pump.

The vertical shaft pump includes a pump casing, a rotary shaft arranged along the pump casing, and an impeller attached to the lower end side of the rotary shaft. The vertical shaft pump disclosed in Patent Document 1 includes a prime mover connected to a rotary shaft via a speed reducer and a cooling device for cooling the prime mover. The cooling device includes a water passage pipe attached to the lower outer periphery of the pump casing, and heats and exchanges the cooling water for cooling the prime mover with the water in the water absorption tank to lower the temperature of the cooling water.

Japanese Unexamined Patent Publication No. 2020-2815

In the water absorption tank, there are a region where the water flow is fast and a region where the water flow is slow, and in the region where the water flow is slow, the cooling water temperature lowering efficiency (heat exchangeability) is lower than in the region where the water flow is fast. Nothing is considered about. Therefore, there is room for improvement in the vertical shaft pump of Patent Document 1 regarding the cooling efficiency of the cooling water.

An object of the present invention is to provide a vertical shaft pump capable of efficiently lowering the temperature of cooling water for cooling a heat generating device.

One aspect of the present invention includes a tubular pump casing having a lower portion arranged in a water absorption tank, and a cooling device for circulating cooling water to cool a heat generating device, wherein the cooling device is the pump casing. A vertical shaft pump is provided which is arranged on the outside of the lower portion and includes a movable member which is movable in the radial direction about the pump casing, and the movable member has a water passage pipe through which the cooling water can pass.

In this embodiment, the cooling device for cooling the heat generating device includes a movable member that can move in the radial direction around the pump casing, and the movable member has a water passage pipe through which cooling water can pass. Therefore, by arranging the movable member (water pipe) in the region of the water absorption tank where the water flow is fast, the cooling water can be efficiently lowered (heat exchange). Further, the region where the water flow is fast in the water absorption tank is a portion where an air suction vortex is likely to be generated, and the generation of the air suction vortex can be suppressed by arranging the movable member in this region.

In the vertical shaft pump of the present invention, the cooling water for cooling the heat generating device can be efficiently lowered.

Sectional drawing of the vertical shaft pump which concerns on 1st Embodiment of this invention. Schematic diagram of the cooling device provided in the vertical shaft pump. FIG. 5 is an enlarged cross-sectional view of a part of FIG. Top view of a fixed water pipe. FIG. 4A is a sectional view taken along line BB. Sectional drawing which shows a part of a movable water pipe. A plan sectional view of a suction water tank. The cross-sectional view which shows the part of the vertical shaft pump of 2nd Embodiment. FIG. 6 is a cross-sectional view showing a state in which the movable member has moved to a position different from that of FIG. 7A. The cross-sectional view which shows the part of the vertical shaft pump of 3rd Embodiment. A plan sectional view of a suction water tank. The perspective view which shows the positioning member. The schematic diagram of the cooling device provided in the vertical shaft pump of 4th Embodiment. FIG. 11A is a schematic view showing an example of an operating state of the cooling device of FIG. 11A.

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

(First Embodiment)
FIG. 1 shows a vertical shaft pump 10 according to the first embodiment of the present invention. As shown in FIG. 1, the vertical shaft pump 10 is arranged in the water absorption tank 1 of the drainage pump station, and discharges the liquid such as rainwater that has flowed into the water absorption tank 1 to the downstream side.

Referring to FIGS. 1 and 6, the water absorption tank 1 includes a pump floor (installation floor) 2 that covers the upper part, a bottom wall 3 that closes the lower part, a pair of side walls 4 that close both sides of the water inflow direction F, and an inflow of water. It is defined by an end wall 5 that closes the downstream end of the direction F. Liquids such as rainwater flow in from the left side (upstream side) to the right side (downstream side) in FIGS. 1 and 6 and collect in the water absorption tank 1.

As shown in FIG. 1, the vertical shaft pump 10 includes a pump casing 12, a rotary shaft 20, an impeller 23, a drive mechanism 25, and a water-cooled cooling device 35, and collects liquid accumulated up to a predetermined water level in a water absorption tank 1. Discharge to the downstream side from.

The pump casing 12 is inserted into the through hole 2a formed in the pump floor 2 from above and fixed to the pump floor 2. The pump casing 12 includes a pumping pipe 13 arranged in the water absorption tank 1 and a discharge pipe 17 arranged on the pump floor 2.

The pumping pipe 13 includes a straight pipe 14, a vane case 15, and a bell mouth 16, and protrudes downward from the through hole 2a in the vertical direction. The straight pipe 14 is an upper pipe having a uniform diameter. The vane case 15 is a substantially elliptical tubular lower pipe that bulges outward in the radial direction, and is connected to the lower end of the straight pipe 14. Inside the vane case 15, a cylindrical bearing casing 15a coaxial with the vane case 15 is provided. The bell mouth 16 is a substantially conical lower pipe whose diameter gradually increases toward the lower end, and is connected to the lower end of the vane case 15. The lower end of the bell mouth 16 is a suction port 16a arranged at a predetermined interval with respect to the bottom wall 3.

The discharge pipe 17 includes a discharge elbow 18 connected to the upper end of the pumping pipe 13 and a water pipe (not shown) arranged on the pump floor 2. The discharge elbow 18 is a curved pipe whose axis is curved by 90 degrees, is connected to the upper end of the straight pipe 14, and projects upward from the pump floor 2. A base plate 18a for fixing the pump casing 12 to the pump floor 2 is provided below the discharge elbow 18. However, the base plate may be provided on the upper end side of the straight pipe 14.

The rotary shaft 20 is arranged along the axis A of the pumping pipe 13 through the discharge pipe 17, and is rotatably supported by the underwater bearing 21. More specifically, the rotary shaft 20 includes an inner portion 20a arranged inside the pump casing 12 and an outer portion 20b arranged outside the pump casing 12. The lower end of the inner portion 20a penetrates the bearing casing 15a and is arranged between the bearing casing 15a and the suction port 16a. The outer portion 20b of the rotating shaft 20 projects outward from the discharge pipe 17 and is mechanically connected to the drive mechanism 25. The portion of the rotating shaft 20 that penetrates the discharge elbow 18 is watertightly sealed by the shaft sealing device 22.

The impeller 23 is arranged below the bearing casing 15a and attached to the lower end of the inner portion 20a. When the rotary shaft 20 is rotated by the drive mechanism 25, the impeller 23 rotates integrally with the rotary shaft 20 and discharges the liquid in the water absorption tank 1 to the downstream side through the inside of the pump casing 12.

The drive mechanism 25 is mechanically connected to the outer portion 20b of the rotary shaft 20 to rotate the rotary shaft 20. The drive mechanism 25 of the present embodiment includes a drive machine 26 that is driven by an operator's command and a transmission mechanism 29 that transmits the drive force of the drive machine 26 to the rotary shaft 20, and is arranged on the pump floor 2.

A diesel engine, which is one of the internal combustion engines, is used as the drive machine 26. The drive machine 26 includes an output shaft 27 that projects in a direction (horizontal direction) intersecting the rotation shaft 20. The drive machine 26 is a heat generating device that generates heat by driving, and includes a heat exchanger 28 for cooling. The heat exchanger 28 suppresses overheating of the drive machine 26 by adsorbing the heat of the drive machine 26 by the cooled water passed through the water exchanger 28.

The transmission mechanism 29 is a speed reducer that is connected to the output shaft 27 and the rotary shaft 20, respectively, and reduces the rotational speed of the rotary shaft 20 with respect to the rotational speed of the output shaft 27 to rotate the rotary shaft 20. Like the drive machine 26, the transmission mechanism 29 is a heat generating device that generates heat by driving, and includes a heat exchanger 30 for cooling. The heat exchanger 30 suppresses overheating of the transfer mechanism 29 by adsorbing the heat of the transfer mechanism 29 by the passed cooling water.

The cooling device 35 is provided to circulate and supply cooling water to the heat exchangers 28 and 30 to prevent overheating of the drive machine 26 and the transmission mechanism 29. As shown in FIGS. 1 and 2, the cooling device 35 includes a main flow path 37 arranged on the pump floor 2 and a regeneration flow path 45 arranged in the water absorption tank 1. In the main flow path 37, the target heat generating device is cooled with cooling water, and in the regeneration flow path 45, the cooling water itself is cooled (regenerated).

The heat exchangers 28 and 30 and the plurality of water pipes 46 and 48 constituting the regeneration flow path 45 are connected to the main flow path 37, respectively. The main flow path 37 includes a circulation pump 38 that circulates the cooling water and a tank 39 that stores the cooling water for replenishment.

The suction port of the circulation pump 38 and the tank 39 are connected by a pipe 40. When the cooling water in the main flow path 37 and the regeneration flow path 45 is insufficient, the cooling water in the tank 39 is replenished to the main flow path 37 through the pipe 40. A pipe 41 is connected to the discharge port of the circulation pump 38. The downstream side of the pipe 41 is bifurcated, of which the branch pipe 41a is connected to the inlet of the heat exchanger 28 of the drive machine 26 and the branch pipe 41b is connected to the inlet of the heat exchanger 30 of the transmission mechanism 29. Has been done.

The branch pipe 42a of the pipe 42 is connected to the outlet of the heat exchanger 28 of the drive machine 26, and the branch pipe 42b of the pipe 42 is connected to the outlet of the heat exchanger 30 of the transmission mechanism 29. The pipe 42 on the heat exchanger 28, 30 side and the pipe 40 on the circulation pump 38 side are connected by a connection pipe 43.

The regeneration flow path 45 is branched and connected to the connection pipe 43, and is provided to lower (regenerate) the temperature of the cooling water supplied to the heat exchangers 28 and 30. The cooling water discharged by the circulation pump 38 adsorbs the heat of the drive machine 26 and the transmission mechanism 29 as they pass through the heat exchangers 28 and 30, and raises the temperature. Subsequently, when passing through the regeneration flow path 45, heat is taken by the water in the water absorption tank 1 to lower the temperature, and the heat is supplied to the heat exchangers 28 and 30 again by the circulation pump 38.

The regeneration flow path 45 includes a fixed water pipe 46 attached to the pump casing 12, a movable water pipe 48 provided by each of the plurality of movable members 47 attached to the pump casing 12, and a connecting pipe 43 (main flow path) connecting these. 37) is provided with a connecting pipe 49 to be connected to each. The connecting tube 49 is composed of a flexible tube having flexibility. Four movable water pipes 48 of this embodiment are used, and in the following description, they may be referred to as 48A, 48B, 48C, 48D as necessary.

As most clearly shown in FIG. 2, the fixed water pipe 46 and the movable water pipe 48 each have switching valves 51A to 51J for switching between a communication state in which cooling water can pass and a shutoff state in which cooling water cannot flow. It is connected to the connection pipe 43 via the connection pipe 43. The switching valves 51A to 51J are three-way valves having three connection ports 51a to 51c, respectively, and capable of switching between the open state and the closed state of the individual ports 51a to 51c. In the individual switching valves 51A to 51J, the heat exchangers 28 and 30 are connected to the connection port 51a, the water pipes 46 and 48 are connected to the connection port 51b, and the circulation pump 38 side is connected to the connection port 51c.

Specifically, the inflow side of the fixed water pipe 46 is connected to the connecting pipe 43 via the switching valve 51A, and the outflow side of the fixed water pipe 46 is connected to the connecting pipe 43 via the switching valve 51B. The inflow side of the movable water pipe 48A is connected to the connecting pipe 43 via the switching valve 51C, and the outflow side of the movable water pipe 48A is connected to the connecting pipe 43 via the switching valve 51D. The inflow side of the movable water pipe 48B is connected to the connecting pipe 43 via the switching valve 51E, and the outflow side of the movable water pipe 48B is connected to the connecting pipe 43 via the switching valve 51F. The inflow side of the movable water pipe 48C is connected to the connecting pipe 43 via the switching valve 51G, and the outflow side of the movable water pipe 48C is connected to the connecting pipe 43 via the switching valve 51H. The inflow side of the movable water pipe 48D is connected to the connecting pipe 43 via the switching valve 51I, and the outflow side of the movable water pipe 48D is connected to the connecting pipe 43 via the switching valve 51J.

The connection ports 51a and 51b of the switching valve 51A are in a communicating state, the connection port 51c is in a cutoff state, and the connection ports 51b and 51c of the switching valve 51B are in a communication state, and the connection port 51a is in a cutoff state. The cooling water can be passed through the fixed water pipe 46 in a communication state. On the other hand, the connection ports 51a and 51c of the switching valve 51A are in a communicating state, the connection port 51b is in a cutoff state, the connection ports 51a and 51c of the switching valve 51B are in a communication state, and the connection port 51b is in a cutoff state. The cooling water inside cannot be passed through the fixed water pipe 46. However, the cooling water can flow from the heat exchanger 28, 30 side to the circulation pump 38 side through the connection pipe 43 and the switching valves 51A, 51B in the shutoff state.

The connection ports 51a and 51b of the switching valve 51C are in a communicating state, the connection port 51c is in a cutoff state, and the connection ports 51b and 51c of the switching valve 51D are in a communication state, and the connection port 51a is in a cutoff state. The cooling water can be communicated to the movable water pipe 48A. On the other hand, the connection ports 51a and 51c of the switching valve 51C are in a communication state, the connection port 51b is in a cutoff state, and the connection ports 51a and 51c of the switching valve 51D are in a communication state, and the connection port 51b is in a cutoff state. The cooling water inside cannot be passed through the movable water pipe 48A. However, the cooling water can flow from the heat exchanger 28, 30 side to the circulation pump 38 side through the connection pipe 43 and the switching valves 51C, 51D in the shutoff state.

Similar to the movable water pipe 48A, the movable water pipe 48B connected to the connecting pipe 43 via the switching valves 51E and 51F, the movable water pipe 48C connected to the connecting pipe 43 via the switching valves 51G and 51H, and The movable water pipe 48D connected to the connection pipe 43 via the switching valves 51I and 51J can also pass the cooling water in the main flow path 37 in a communication state and water flow by switching the corresponding switching valves 51E to 51J. It is possible to switch to an impossible cutoff state.

Subsequently, referring to FIG. 2, temperature sensors 52 for detecting the temperature of the cooling water are arranged on the inlet side and the outlet side of the water pipes 46 and 48, respectively. More specifically, in the connecting pipe 43, the temperature sensor 52A is located upstream of the switching valve 51A, the temperature sensor 52B is located between the switching valves 51B and 51C, and the temperature sensor 52C is located between the switching valves 51D and 51E. However, a temperature sensor 52D is interposed between the switching valves 51F and 51G, a temperature sensor 52E is interposed between the switching valves 51H and 51I, and a temperature sensor 52F is interposed downstream of the switching valves 51J.

The temperature sensor 52A functions as a first detection unit that detects the temperature on the inlet side of the fixed water pipe 46. The temperature sensor 52B functions as a second detection unit that detects the temperature on the outlet side of the fixed water pipe 46 and a first detection unit that detects the temperature on the inlet side of the movable water pipe 48A. The temperature sensor 52C functions as a second detection unit that detects the temperature on the outlet side of the movable water pipe 48A and a first detection unit that detects the temperature on the inlet side of the movable water pipe 48B. The temperature sensor 52D functions as a second detection unit that detects the temperature on the outlet side of the movable water pipe 48B and a first detection unit that detects the temperature on the inlet side of the movable water pipe 48C. The temperature sensor 52E functions as a second detection unit that detects the temperature on the outlet side of the movable water pipe 48C and a first detection unit that detects the temperature on the inlet side of the movable water pipe 48D. The temperature sensor 52F functions as a second detection unit that detects the temperature on the outlet side of the movable water pipe 48D.

By calculating the difference between the detection temperature T1 indicated by the temperature sensors 52A to 52E on the inlet side and the detection temperature T2 indicated by the temperature sensors 52B to 52F on the outlet side, the fixed water passage pipe 46 and the movable water passage pipes 48A to 48D are calculated. The heat exchange efficiency of the cooling water can be determined. Therefore, for example, by arranging the movable water pipes 48A to 48D in the region where the temperature difference between the inlet side and the outlet side is the largest, the heat exchange efficiency of the cooling water can be improved.

Further, it is possible to determine whether or not there is an abnormality (for example, breakage) in any of the plurality of movable water pipes 48A to 48D based on the difference in the detected temperatures indicated by the temperature sensors 52A to 52F. For example, when the temperature difference between the inlet and the outlet is excessively large (for example, 15 degrees), it can be determined that the cooling water is not flowing to the outlet side due to the damage of the water passages 46 and 48. In this case, the target water passages 46 and 48 can be excluded from the cooling path by switching the corresponding switching valves 51A to 51J. Therefore, it is possible to suppress a decrease in the heat exchange efficiency of the cooling water.

Next, a specific configuration of the movable member 47 including the fixed water pipe 46 and the movable water pipe 48 will be described.

As shown in FIGS. 3 and 4A, the fixed water pipe 46 has an arc shape (C shape) that substantially surrounds the lower portion of the pump casing 12, and is composed of a metal pipe having good heat transfer properties. The fixed water pipe 46 is attached to a mounting portion 16b formed on the bell mouth 16 so as to be located on the upper outer side of the suction port 16a.

The mounting portion 16b has a plate-shaped rib 16c protruding radially outward from the bell mouth 16, a lower support portion 16d provided at the outer end of the rib 16c, and an inner side protruding upward from the lower support portion 16d. A support portion 16e is provided. Among them, a plurality of ribs 16c and inner support portions 16e are provided at intervals in the circumferential direction with respect to the bell mouth 16, and the remaining lower support portions 16d are formed in an annular shape.

Referring to FIG. 4A, as the fixed water pipes 46, three types of four fixed water pipes 46A to 46D having different diameters are used. The one fixed water pipe 46A with the smallest diameter, the two fixed water pipes 46B and 46C with a larger diameter than the fixed water pipe 46A, and the one fixed water pipe 46D with the largest diameter are pumps. The casings 12 are arranged at intervals in the radial direction. Among them, the fixed water pipes 46B and 46C having the same diameter are arranged vertically at intervals. However, the number of fixed water pipes 46 can be changed as needed. Further, although the arrangement of the fixed water pipes 46 can be changed as needed, it is preferable that the gap between the adjacent fixed water pipes 46 is constant.

Connecting members 54 are attached to both ends of the C-shaped fixed water pipes 46A to 46D, respectively. When viewed from the direction in which the axis A extends, the shapes of the fixed water pipes 46A to 46D including the pair of connecting members 54 are substantially circular. Each of the connecting members 54 has a cylindrical shape with one end opened and the other end closed, and a flexible connecting pipe 49 is connected to the opening at one end. The four fixed water pipes 46A to 46D are connected to the outer peripheral portion of the connecting member 54, respectively. Of the pair of connecting members 54, the cooling water flows in from the side connected to the switching valve 51A, passes through the fixed water pipes 46A to 46D, and then flows out from the side connected to the switching valve 51B.

The plurality of fixed water pipes 46A to 46D are held by the holding member 55. Three holding members 55 are arranged at intervals of 90 degrees with respect to the connecting member 54. Referring to FIG. 4B, the individual holding members 55 are provided with insertion holes 55a through which the fixed water pipes 46A to 46D are individually inserted, and hold the adjacent fixed water pipes 46A to 46D at regular intervals.

As shown in FIGS. 1 and 3, the movable water pipe 48 is composed of a pipe curved so as to exhibit a spiral shape, and is held by a holding member 56. The movable water pipe 48 is made of a material having good heat transfer properties (for example, cupra nickel copper alloy). The holding member 56 is made of a material (eg, engineering plastic) that provides buoyancy with respect to water. As a result, the movable water pipe 48 can float according to the water flow in the water absorption tank 1. Flexible connecting pipes 49 are connected to the upper and lower ends of the movable water pipe 48, respectively. These connecting pipes 49 are connected to any of the switching valves 51C and 51D, 51E and 51F, 51G and 51H, and 51I and 51J shown in FIG.

The total length from the lower end to the upper end of the movable water pipe 48 is set to a dimension that can realize the following configuration. The lower end of the movable water pipe 48 is located below the lower end of the impeller 23 and is located below the lower end of the impeller 23 so that the lower part of the movable water pipe 48 is submerged in water during steady operation when the impeller 23 is immersed in water. Is also arranged so as to be located above. At a water level where air suction vortex S is unlikely to occur, the entire movable water pipe 48 is immersed in water, and at a water level where air suction vortex S is likely to occur, the upper end of the movable water pipe 48 is exposed from the water surface. The upper end of the 48 is located below the upper end of the vane case 15 and above the upper end of the impeller 23.

Here, the air suction vortex S is a water flow in which the air in the water suction tank 1 is continuously or intermittently included in the water flowing from the water surface toward the suction port 16a of the pump casing 12, as shown in FIG. Means that. For example, when the water level in the water absorption tank 1 is higher than that of the vane case 15, the flow of water in the water absorption tank 1 is slow, so that the air suction vortex S is unlikely to occur. When the water level in the water absorption tank 1 becomes lower than that in the vane case 15 due to the discharge, the flow of water in the water absorption tank 1 becomes high speed, so that an air suction vortex S is likely to occur.

One side of the spiral movable water pipe 48 is held by a holding member 56. The holding member 56 extends from the upper end to the lower end of the movable water pipe 48. Referring to FIG. 5, the holding member 56 is provided with an insertion portion through which individual rolls 48a, which are a part of the movable water pipe 48, are individually inserted, and the rolls 48a adjacent to the pump casing 12 in the axial direction at regular intervals. To hold.

The holding member 56 of the present embodiment is composed of an inner member 56a arranged radially inside the movable water pipe 48 and an outer member 56b arranged radially outside the movable water pipe 48. These are engaged and integrated by a locking tool or locking structure (not shown). The mounting position of the holding member 56 with respect to the movable water pipe 48 is the position closest to the pump casing 12, but it can be changed as needed.

As shown in FIG. 3, a plurality of movable members 47 provided with the movable water pipe 48 are provided at intervals in the circumferential direction with respect to the pump casing 12 (four in the present embodiment). Referring to FIG. 6, two movable members 47 (movable water pipes 48A and 48B) are arranged on both downstream sides of the water inflow direction F, and two movable members are arranged on both upstream sides of the water inflow direction F. 47 (movable water pipes 48C, 48D) are arranged.

Each movable member 47 has a pair of connecting members 61, and is movably attached to a mounting frame 58 on the lower outer side of the pumping pipe 13. The mounting frame 58 includes a pair of support members 59 and a shaft member 60. Referring to FIG. 6, each of the movable members 47 is located at the second position (the two on the left side in FIG. 6) closest to the outer peripheral portion of the pumping pipe 13 and the second position farthest from the outer peripheral portion of the pumping pipe 13. In FIG. 6, the two on the right side) can be individually rotated in an angle range of approximately 180 degrees.

Each of the support members 59 is attached to the pumping pipe 13. Specifically, one of the pair of support members 59 is attached to the inner support portion 16e of the bell mouth 16, and the other is attached to the vane case 15 so as to be located above the inner support portion 16e.

The shaft member 60 is a straight pipe extending in parallel along the axis A of the pumping pipe 13, and the lower end and the upper end are rotatably supported by the support member (bearing) 59, respectively. The shaft member 60 is composed of a rigid body (for example, metal) that is not deformed by a load due to water flowing into the water absorption tank 1 and a load due to rotation of the movable member 47. Depending on the total length of the shaft member 60, the intermediate portion of the shaft member 60 may also be rotatably supported by the support member.

The connecting member 61 is attached to two places above and below the shaft member 60, and connects the shaft member 60 and the movable water pipe 48. 3 or more connecting members 61 may be used depending on the total length of the shaft member 60. The connecting member 61 includes a cylindrical tubular portion 62 fixed to the shaft member 60, and an arm 63 protruding from the tubular portion 62. The movable water pipe 48 (movable member 47) rotates horizontally with respect to the pumping pipe 13 by the rotation of the shaft member 60. That is, the movable member 47 is arranged on the lower outer side of the pump casing 12, and can move in the radial direction about the pump casing 12.

The arm 63 projects in a direction intersecting the axis of the shaft member 60. An outer member 56b of the holding member 56 is attached to the tip of the arm 63, and a movable water pipe 48 is attached via the holding member 56. However, the movable water pipe 48 may be directly attached to the tip of the arm 63. The total length of the arm 63 is set to a size that allows the movable water pipe 48 to be arranged in a region where an air suction vortex S is statistically likely to occur.

When an air suction vortex S is generated in the water suction tank 1 by the operation of the vertical shaft pump 10, a water flow is generated from the water surface to the suction port 16a, so that the surrounding water flows toward the air suction vortex S. According to this water flow, the movable water pipe 48 floats on the air suction vortex S. As a result, the movable water pipe 48 obstructs the water flow from the water surface toward the suction port 16a, so that the air suction vortex S can be effectively extinguished and the subsequent generation of the air suction vortex S at that position can be suppressed. ..

Referring to FIG. 1, the vertical shaft pump 10 is provided with a rotation mechanism 65 for forcibly rotating the movable member 47 with respect to the pump casing 12. The rotation mechanism 65 includes rods 66A to 66C and an operation member 68 detachably attached to the upper end of the rod 66A, and is provided for each movable member 47.

The first rod 66A, the second rod 66B, and the third rod 66C are arranged downward from the pump floor 2 in this order, and are connected to each other by a universal joint 67 so that their angles can be changed. There is. The upper end of the rod 66A penetrates the base plate 18a of the discharge elbow 18 and projects upward from the pump floor 2. The lower end of the rod 66C is connected to the upper end of the shaft member 60.

The individual rods 66A to 66C are hollow, and a connecting pipe 49 is inserted therein. The connecting pipe 49 derived from the rod 66A is connected to the switching valves 51A to 51J. At the portion where the universal joint 67 is located, the connecting pipe 49 is led out (detoured) from the rods 66A to 66C. That is, most of the connecting pipe 49 is arranged in the rods 66A to 66C. However, the connecting pipe 49 may be arranged along the outer surface of the rods 66A to 66C, and the pipe structure thereof can be changed as needed.

The operating member 68 is a lever that is detachably attached to the upper end of the rod 66A. The attachment of the operating member 68 to the rod 66A can be applied to any attachment structure as long as the rod 66A can be rotated by operating the operating member 68 and the operating member 68 can be attached and detached. Further, it is preferable that the base plate 18a is provided with a holding mechanism for holding the rod 66A or the operating member 68 in a non-rotatable manner. As the holding mechanism, a cover that can be attached to the base plate 18a is provided so as to cover the rod 66A or the operating member 68, and the rod 66A or the operating member 68 can be held non-rotatably by this cover.

When the rod 66A is rotated by operating the operating member 68, the movable water pipe 48 can be arranged at a desired position with respect to the pump casing 12 via the rods 66B and 66C, the shaft member 60, and the connecting member 61. Further, by holding the rod 66A or the operating member 68 with the holding mechanism after moving the movable water pipe 48, the arrangement of the movable water pipe 48 with respect to the water absorption tank 1 can be maintained. Further, by leaving the rod 66A or the operating member 68 in a free state without holding the rod 66A, the movable water pipe 48 can be floated according to the water flow in the water absorption tank 1.

As described above, in the present embodiment, the movable water pipe is located in the region where the air suction vortex S, which is the region where the water flow is the fastest, is likely to be generated in the water absorption tank 1 by floating according to the water flow or forced movement by the rotation mechanism 65. 48 can be placed.

The vertical shaft pump 10 configured as described above has the following features.

The cooling device 35 for cooling the drive machine 26 and the transmission mechanism 29 includes a movable member 47 that can move radially around the lower portion of the pump casing 12 located in the water absorption tank 1, and the movable member 47 provides cooling water. It has a water passage pipe 48 capable of passing water. Therefore, by arranging the movable member 47 (movable water pipe 48) in the region of the water absorption tank 1 where the water flow is fast, the cooling water can be efficiently lowered (heat exchange). Therefore, overheating of the drive machine 26 and the transmission mechanism 29, which are heat generating devices, can be suppressed.

Further, in the water absorption tank 1, the region where the water flow is fast is a portion where the air suction vortex S is likely to be generated, and by arranging the movable member 47 in this region, the air suction vortex S can be effectively extinguished, and at that position. It is possible to suppress the subsequent generation of the air suction vortex S. Therefore, the vibration of the pump 10 that causes the deterioration of the pump floor 2 can be suppressed.

Since a plurality of movable members 47 including the movable water pipe 48 are arranged in the pump casing 12, the heat exchange efficiency of the cooling water can be improved. Further, since the switching valve 51 for switching the main flow path 37 and the movable water pipe 48 between the communication state and the shutoff state is provided, only a part of the plurality of movable water pipes 48 that has been damaged can be excluded from the cooling path. Therefore, it is possible to prevent a decrease in the heat exchange efficiency of the cooling water and prevent foreign matter in the water absorption tank 1 from being mixed into the piping constituting the cooling device 35. Further, since the cooling device 35 can be continuously used without stopping the operation of the pump 10, the reliability can be improved.

Since the temperature sensors 52 are arranged at the entrances and exits of the movable water pipe 48, the heat exchange efficiency can be individually determined by the difference in temperature detected by them. Therefore, by arranging the movable member 47 (movable water pipe 48) in the region where the temperature difference is the largest, the heat exchange efficiency of the cooling water can be surely improved.

Since the movable water pipe 48 is formed in a spiral shape, it is possible to secure a distance that allows contact with the water in the water absorption tank 1. Therefore, the heat exchange efficiency of the movable water pipe 48 can be improved.

Since the holding member 56 that holds an adjacent portion of the movable water pipe 48 is provided, it is possible to suppress the vibration of the movable water pipe 48 itself due to the water flow in the water absorption tank 1 or the vibration of the pump casing 12. Therefore, damage to the movable water pipe 48 and damage to the attachment portion of the movable water pipe 48 to the pump casing 12 can be suppressed.

Since the rods 66A to 66C for rotating the movable member 47 are provided and the flexible connecting pipe 49 is connected to the movable water pipe 48, the movable member 47 moves with respect to the pump casing 12 and the cooling water circulates. Can be compatible with. Further, since most of the connecting pipe 49 is arranged in the rods 66A to 66C, it is difficult for the connecting pipe 49 to be loaded by the water flow in the water absorbing tank 1. Therefore, damage to the connecting pipe 49 itself and damage to the connecting portion between the connecting pipe 49 and the movable water pipe 48 can be suppressed.

A fixed water pipe 46 surrounding the pump casing 12 is provided, and a plurality of the fixed water pipes 46 are arranged at intervals in the radial direction of the pump casing 12, so that the heat exchange efficiency of the cooling water can be further improved. Further, since the holding member 55 for holding the adjacent fixed water pipe 46 is provided, the vibration of the fixed water pipe 46 itself due to the water flow in the water absorption tank 1 or the vibration of the pump casing can be suppressed. Therefore, damage to the fixed water pipe 46 and damage to the attachment portion of the fixed water pipe 46 to the pump casing 12 can be suppressed.

(Second Embodiment)
7A and 7B show the vertical shaft pump 10 of the second embodiment. This vertical shaft pump 10 is different from the vertical shaft pump 10 of the first embodiment in that the movable member 47 is provided with a hollow float member 70 in order to promote the floating of the movable water pipe 48 according to the water flow. do.

The float member 70 is made of a resin having excellent strength (for example, Engineering plastic). The float member 70 is provided with closing portions 70a for sealing a space portion at both ends of a cylindrical main body having an outer diameter smaller than the inner diameter of the movable water pipe 48. Each of the closing portions 70a has a predetermined thickness and includes an insertion hole 70b penetrating in the radial direction.

The movable water pipe 48 is arranged on the outer periphery of the float member 70, and is connected to the main flow path 37 by the connecting pipe 49 as in the first embodiment. The attachment of the movable water pipe 48 to the float member 70 can be applied to any attachment structure that can realize the attachment.

The arm 63 has a diameter smaller than the diameter of the insertion hole 70b, penetrates the insertion hole 70b, and allows the float member 70 to move. At the tip of the arm 63, a retaining portion 63a having a diameter larger than the diameter of the insertion hole 70b is provided in order to prevent the float member 70 from falling off.

Since the movable member 47 configured in this way includes a float member 70 that can float according to the water flow in the water absorption tank 1, the movable water pipe 48 also floats reliably according to the water flow in the water absorption tank 1. Moreover, the float member 70 (movable water pipe 48) not only moves in the direction of rotation with respect to the shaft member 60, but also with respect to the pump casing 12 along the arm 63 as shown in FIGS. 7A and 7B. It is also possible to move in the direction of approaching and separating.

As described above, in the vertical shaft pump 10 of the second embodiment, the movable water pipe 48 can be reliably and automatically arranged in the region where the water flow is fast in the water absorption tank 1, so that the heat exchange efficiency of the cooling water can be reliably improved. Further, since the portion of the water absorption tank 1 where the water flow is fast is a portion where the air suction vortex S is likely to be generated, the generation of the air suction vortex S can be efficiently suppressed.

(Third Embodiment)
8 to 10 show the vertical shaft pump 10 of the third embodiment. The vertical shaft pump 10 is different from the vertical shaft pump 10 of the first embodiment in that the rotary mechanism 65 is provided with a positioning member 72 in order to dispose the movable member 47 at a predetermined position outside the pump casing 12.

The positioning member 72 is the second position (two on the right side in FIG. 9) that is farthest from the outer peripheral portion of the pumping pipe 13 from the first position (two on the left side in FIG. 9) closest to the outer peripheral portion of the pumping pipe 13. ) Is provided to position the movable water pipe 48 at a predetermined position in the range of). The positioning member 72 comprises a pantograph jack rotatably connected to the upper end of the shaft member 60 and the upper portion of the movable water pipe 48, respectively. In this embodiment, the shaft member 60 is non-rotatably joined to the support member 59, and the connecting member 61 is rotatably arranged with respect to the shaft member 60.

The positioning member 72 is arranged in each of the four movable water pipes 48, and the movable water pipes 48 are individually moved to the first position and the second position. Referring to FIG. 10, each positioning member (pantograph jack) 72 includes four arms 73A-73D, two connecting members 76, and one screw shaft 80.

The total lengths of the arms 73A to 73B are all the same size, and are set according to the moving distance from the first position to the second position. One ends of the two arms 73A and 73B are rotatably connected to each other by a pin 74, and one ends of the other two arms 73C and 73D are rotatably connected to each other by a pin 74. The other ends of the arms 73A and 73C are rotatably connected to one connecting member 76 by pins 75, and the other ends of the other arms 73B and 73D are rotatably connected to the other connecting member 76 by pins 75. Has been done.

The connecting member 76 includes a bracket 77 fixed to the movable water pipe 48, or a connecting portion 76a for connecting the bracket 78 fixed to the shaft member 60. The connecting portion 76a is composed of a concave groove extending in the horizontal direction, and includes a pin hole 76b penetrating in the vertical direction. The bracket 77 of the movable water pipe 48 is an inverted L-shaped member having a plate thickness that protrudes from the holding member 56 and can be inserted into the connecting portion 76a. The bracket 77 has a pin hole 77a that matches the pin hole 76b and is rotatably connected to the connection portion 76a by a pin 79. The bracket 78 of the shaft member 60 is a flat plate member having a plate thickness that can be inserted into the connection portion 76a, has a pin hole 78a that matches the pin hole 76b, and is rotatably connected to the connection portion 76a by a pin 79. ..

The screw shaft 80 penetrates the intersection of the arms 73A and 73B and the intersection of the arms 73C and 73D. The lower end of the screw shaft 80 is rotatably connected to a bearing 81 arranged at the intersection of the arms 73C and 73D. The upper end side of the screw shaft 80 penetrates a nut (not shown) arranged at the intersection of the arms 73A and 73B and projects upward. A square columnar head 80a is provided at the upper end of the screw shaft 80. The lower end of the rod 66C shown in FIG. 1 is connected to the head 80a.

When the head 80a is operated via the rods 66A to 66C to rotate the screw shaft 80 in the normal direction, the arms 73A to 73D move so that the pair of connecting members 76 are close to each other. When the head 80a is operated to reverse the screw shaft 80, the arms 73A to 73D move so that the pair of connecting members 76 separate from each other. These moving states are held by the resistance between the screw shaft 80 and the nut.

As shown in FIG. 9, the bracket 78 of the shaft member 60 projects to the opposite side of the direction in which the movable water pipe 48 is rotated. As shown in the two left sides of FIG. 9, the positioning member 72 presses the movable water pipe 48 by separating the connecting member 76, rotates the movable water pipe 48 with respect to the shaft member 60, and pumps the water pipe. The movable water pipe 48 is moved to the first position close to 13. As shown in the two on the right side of FIG. 9, the positioning member 72 pulls the movable water pipe 48 by bringing the connecting member 76 close to each other, rotates the movable water pipe 48 with respect to the shaft member 60, and causes the pumping pipe 13 to rotate. The movable water pipe 48 is moved to the second position separated from the movable water pipe 48.

The movable water pipe 48 moved to the first position or the second position is held in that position unless the screw shaft 80 is rotated. Further, the movable water pipe 48 is not limited to the first position and the second position, but is held at an arbitrary position between the first position and the second position by the positioning member 72.

Since the vertical shaft pump 10 of the third embodiment includes a positioning member 72 for positioning the movable member 47 (movable water pipe 48) with respect to the pump casing 12, a region (that is, air suction) in which the water flow in the water absorption tank 1 is fast (that is, air suction). The movable water pipe 48 can be reliably arranged in the vortex S generation region). Further, the movable water pipe 48 arranged at a predetermined position does not move due to the influence of the water flow. Therefore, the heat exchange efficiency of the cooling water can be surely improved, and the generation of the air suction vortex can be effectively suppressed.

(Fourth Embodiment)
FIG. 11A shows a cooling device 35 included in the vertical shaft pump 10 of the fourth embodiment. In this cooling device 35, an auxiliary flow path 85 communicating with the water pipes 46, 48A to 48D is provided on the pump floor 2, and the flow rate of the cooling water flowing through the individual water pipes 46, 48 can be adjusted. It is different from the cooling device 35 of one embodiment.

The water pipes 46, 48A to 48D are connected to the connecting pipe 43 via switching valves 51A to 51J, respectively, as in the first embodiment. The switching valves 51A to 51J are four-way valves having four connection ports 51a to 51d, respectively, and capable of switching between the open state and the closed state of the individual ports 51a to 51d. Among them, the heat exchangers 28 and 30 are connected to the connection port 51a, the water pipes 46 and 48 are connected to the connection port 51b, and the circulation pump 38 side is connected to the connection port 51c. A subchannel 85 is connected to the remaining connection port 51d.

The sub-flow path 85 includes pipes 86A to 86J connected to the connection ports 51d of the switching valves 51A to 51J, respectively, and common pipe 87 connected to these pipes 86A to 86J. The common pipe 87 is connected to the downstream side of the switching valve 51J in the connecting pipe 43.

Of the plurality of pipes 86A to 86J, the pipes 86D, 86F, 86H, 86J connected to the outlet side of the movable water pipes 48A to 48D have individual flow rates of cooling water flowing through the movable water pipes 48A to 48D. A flow rate adjusting valve 88 for adjusting is interposed. The flow rate adjusting valve 88 is a variable throttle valve that can adjust the amount of water that can pass by adjusting the opening degree, and the opening degree adjustment may be either an electric type or a manual type.

Since the cooling device 35 of the fourth embodiment includes sub-flow passages 85 connected to the movable water pipes 48A to 48D, the movable water pipes 48A to 48D can be connected in either a series or parallel state. Further, since the flow rate adjusting valve 88 is interposed in the sub-flow path 85, the amount of water flowing through the movable water pipes 48A to 48D can be individually set. Therefore, the heat exchange efficiency of the entire cooling water can be improved according to the water flow in the water absorption tank 1.

When a plurality of water passages 46 and 48 are connected in series by switching the switching valves 51A to 51J, the fluid resistance of the entire cooling path increases, so that the cooling flow rate decreases, but the cooling efficiency of the cooling water increases. Therefore, the difference between the outlet side temperature immediately after flowing out of the heat exchangers 28 and 30 and the inlet side temperature immediately before flowing into the heat exchangers 28 and 30 becomes large.

When a plurality of water passages 46 and 48 are connected in parallel by switching the switching valves 51A to 51J, the fluid resistance of the entire cooling path becomes small, so that the cooling flow rate increases, but the cooling efficiency of the cooling water decreases. Therefore, the difference between the outlet side temperature immediately after flowing out of the heat exchangers 28 and 30 and the inlet side temperature immediately before flowing into the heat exchangers 28 and 30 becomes small.

As described above, since the flow velocity varies depending on the region inside the water absorption tank 1, the cooling efficiency differs depending on the arrangement, especially in the movable water pipes 48A to 48D. Therefore, among the movable water flow pipes 48A to 48D, those arranged in the region where the water flow is fast and the cooling efficiency is good are connected in parallel to allow the cooling water to flow intensively, and the water flow is slow and the cooling efficiency is not preferable. Those placed in the area are connected in series and the cooling path is changed so as to improve the cooling efficiency of the cooling water.

FIG. 11B shows an example of a state in which the cooling path and the flow rate of a part of the cooling water flow are adjusted. In FIG. 11B, of the plurality of connection ports 51a to 51d, a white portion indicates an open state and a black-painted portion indicates a closed state. Further, in the cooling path, the portion where the cooling water flows is shown by a solid line, and the portion where the cooling water does not flow is shown by a broken line.

In the example of FIG. 11B, a part of the cooling water Q1 (cooling water Q2) flowing out from the fixed water flow pipe 46 is cooled by the movable water flow pipe 48A, and a part of the cooling water Q2 flowing out from the movable water flow pipe 48A (cooling water Q2). After cooling the cooling water Q3) with the movable water passage pipes 48B to 48D, all the cooling waters are merged. The flow rate ratio of the cooling water Q3 and Q2-Q3 flowing out from the movable water pipe 48A is adjusted by the flow rate adjusting valve 88 interposed in the pipe 86D.

As described above, in the vertical shaft pump 10 of the fourth embodiment, since the amount of water flowing through the water pipes 46, 48A to 48D can be individually set, the heat exchange efficiency of the entire cooling water can be improved according to the water flow in the water absorption tank 1. .. Further, when a part of the plurality of movable water pipes 46, 48A to 48D is damaged, only the damaged part can be excluded from the cooling path.

The vertical shaft pump 10 of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

For example, the number of movable members 47 (movable water pipes 48) is not limited to four, and may be only one, and can be changed as needed. Further, the arrangement of the movable member 47 with respect to the water absorption tank 1 can be changed as needed.

Even if the movable member 47 does not use the float member 70 having good floating property as in the first embodiment, the movable water pipe 48 is installed along the arm 63 as in the second embodiment. It may be movable.

The positioning member 72 of the third embodiment is not limited to the pantograph jack, and can be changed as needed as long as the movable member 47 can be positioned at a predetermined rotation angle with respect to the pump casing 12.

In the vertical shaft pump 10 of the fourth embodiment, any of the movable members 47 shown in the first to third embodiments can be used.

The heat generating device to be cooled is not limited to the drive device 26 and the transmission mechanism 29, and may be only the drive device 26 or only the transmission mechanism 29. Further, it may be a thrust bearing for a large-capacity pump, and the heat generating device to be cooled can be changed as needed.

1 ... Water absorption tank 2 ... Pump floor 2a ... Through hole 3 ... Bottom wall 4 ... Side wall 5 ... End wall 10 ... Vertical shaft pump 12 ... Pump casing 13 ... Pumping pipe 14 ... Straight pipe 15 ... Vane case (bottom)
15a ... Bearing casing 16 ... Bellmouth (bottom)
16a ... Suction port 16b ... Mounting part 16c ... Rib 16d ... Lower support part 16e ... Inner support part 17 ... Discharge pipe 18 ... Discharge elbow 18a ... Base plate 20 ... Rotating shaft 20a ... Inner part 20b ... Outer part 21 ... Underwater bearing 22 ... Shaft sealing device 23 ... Impeller 25 ... Drive mechanism 26 ... Driver (heat generating device)
27 ... Output shaft 28 ... Heat exchanger 29 ... Transmission mechanism (heat generating device)
30 ... Heat exchanger 35 ... Cooling device 37 ... Main flow path 38 ... Circulation pump 39 ... Tank 40 ... Piping 41 ... Piping 41a, 41b ... Branch piping 42 ... Piping 42a, 42b ... Branch piping 43 ... Connection piping 45 ... Regeneration flow path 46, 46A to 46D ... Fixed water pipe 47 ... Movable member 48, 48A to 48D ... Movable water pipe 48a ... Roll 49 ... Connection pipe 51A to 51J ... Switching valve 51a to 51c ... Connection port 52, 52A to 52F ... Temperature Sensor (detector)
54 ... Connecting member 55 ... Holding member 55a ... Insertion hole 56 ... Holding member 56a ... Inner member 56b ... Outer member 58 ... Mounting frame 59 ... Support member 60 ... Shaft member 61 ... Connecting member 62 ... Cylinder 63 ... Arm 63a ... Part 65 ... Rotation mechanism 66, 66A-66C ... Rod 67 ... Universal joint 68 ... Operating member 70 ... Floating member 70a ... Closing part 70b ... Insertion hole 72 ... Positioning member 73A-73B ... Arm 74 ... Pin 75 ... Pin 76 ... Connection Member 76a ... Connection part 76b ... Pin hole 77 ... Bracket 77a ... Pin hole 78 ... Bracket 78a ... Pin hole 79 ... Pin 80 ... Screw shaft 80a ... Head 81 ... Bearing 85 ... Sub-flow path 86A-86J ... Piping 87 ... Common Piping 88 ... Flow control valve A ... Axis F ... Inflow direction S ... Air suction vortex

Claims (12)

A cylindrical pump casing with the lower part located inside the water absorption tank,
Equipped with a cooling device that circulates cooling water to cool the heat generating equipment.
The cooling device is arranged outside the lower portion of the pump casing and includes a movable member that is radially movable around the pump casing.
The movable member is a vertical shaft pump having a water pipe through which the cooling water can pass. A plurality of the movable members are arranged at intervals in the circumferential direction with respect to the pump casing.
The cooling device is
A main flow path to which the water pipe provided by each of the plurality of movable members and the heat generating device are connected,
The vertical shaft pump according to claim 1, further comprising a plurality of switching valves that individually switch between a communication state in which the cooling water in the main flow path can pass and a shutoff state in which water cannot pass through the water pipe. .. The cooling device is
The sub-flow paths connected to the switching valves, respectively,
The vertical shaft pump according to claim 2, further comprising a plurality of flow rate adjusting valves that are interposed in the sub-flow path and individually adjust the flow rate of the cooling water flowing through the plurality of water pipes. The cooling device is
A first detection unit that detects the temperature on the inlet side of the water pipe, and
The vertical shaft pump according to any one of claims 1 to 3, further comprising a second detection unit for detecting the temperature on the outlet side of the water pipe. The vertical shaft pump according to any one of claims 1 to 4, wherein the water pipe has a spiral shape and a cylindrical shape as a whole. The vertical shaft pump according to claim 5, further comprising a holding member for holding a portion of the water pipe adjacent to the pump casing in the axial direction. A hollow rod for rotating the movable member with respect to the pump casing is provided.
The cooling device includes a flexible connecting pipe for connecting the water pipe and the heat generating device.
Most of the connecting pipe is located in the rod.
The vertical shaft pump according to any one of claims 1 to 6. The movable member has a hollow float member that can float according to the water flow in the water absorption tank.
The water pipe is arranged on the outer periphery of the float member.
The vertical shaft pump according to any one of claims 1 to 7. The vertical shaft pump according to any one of claims 1 to 7, further comprising a positioning member for positioning the movable member at a predetermined position outside the pump casing. The vertical shaft pump according to any one of claims 1 to 9, wherein the cooling device has a fixed water pipe having an arc shape surrounding the lower portion of the pump casing and capable of passing the cooling water. The vertical shaft pump according to claim 10, wherein a plurality of fixed water pipes are arranged at intervals in the radial direction of the pump casing. The vertical shaft pump according to claim 11, further comprising a holding member for holding the fixed water pipe adjacent to the pump casing in the radial direction.

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