JP6802083B2 - Vertical pump - Google Patents

Description

The present invention relates to a vertical shaft pump.

The pump pumps water by rotating the impeller with a drive such as a motor. Therefore, the drive unit continuously generates heat during the operation of the pump, and it is necessary to cool it. There are roughly two types of cooling methods for the drive machine used for pumps installed on land: air cooling with a fan that utilizes the rotation of the drive rotation shaft, and water cooling that uses a cooler. In addition, the normal drive machine does not have sufficient waterproofness, and if it is submerged, it cannot be driven.

On the other hand, there is a demand for countermeasures against inundation of equipment such as pump buildings due to tsunamis, storm surges, local heavy rains, etc., which have been occurring frequently in recent years. Equipment and equipment may be installed at high places, such as by installing a new floor above the floor on which the pump is installed or installing the pump, but the construction cost of the building has become extremely high.

Japanese Unexamined Patent Publication No. 2001-304163 Patent No. 5552402

In order to solve the above-mentioned problems described in the background technology, Patent Document 1 discloses a technology for waterproofing the motor around the pump equipment. However, even if the motor is waterproofed and the structure is such that the motor can be cooled by the submerged water around the motor, a building structure that can normally circulate and drain the water that has once flowed into the area around the motor is being considered. It doesn't flow, and it stagnates on the spot without flowing. Therefore, there is a risk that the motor cannot be sufficiently cooled due to the accumulation of the generated heat in the water flowing into the area around the motor and the residual / accumulation of air bubbles.

On the other hand, Patent Document 2 describes a pump technique in which a coolant circulates inside the motor casing of a water-resistant motor, and a heat exchanger is installed below the motor, which is a part of the flow path, to cool the coolant by pumping water. It is disclosed. However, in the present disclosed technology, the water resistant motor is attached to the pump in a watertight state, and the water contact surface with the pumping water, which is the lower surface of the heat exchanger, is located at a position away from the main flow path above the main flow path of the pump. Since the pumped water in the vicinity of the exchanger tends to stagnate, there is a problem that the cooling efficiency is poor as in Patent Document 1. In addition, when the handling fluid is river water or sewage, it may contain suspended matter with a lighter specific gravity than water and cloth dust that tends to stay in the weak flow part, and if these foreign substances adhere to the heat exchanger, this also It was one of the factors that lowered the cooling efficiency.

In order to improve the efficiency of heat exchange, there is a technique to make the heat exchanger shape corrugated so as to increase the heat transfer area on the lower surface of the heat exchanger, but as described above, air, foreign matter, etc. are collected or clogged in the groove of the corrugated. It is easy to get rid of it, and once it is clogged, it is difficult to discharge it to the discharge port side, and there is a risk that the cooling efficiency will deteriorate.

In the pump operation procedure, the suction pipe and elbow pipe are filled with air instead of fluid before the vertical pump is started. When the pump is started, most of the air in the suction pipe escapes to the outside from the air vent valve installed near the discharge port, but part of it collects in the upper part of the elbow pipe, that is, the lower surface of the heat exchanger. Furthermore, the water pumped by the impeller may contain fine bubbles, and most of the fine bubbles are discharged from the discharge port together with the pumped water, but some of these flow into the vicinity of the heat exchanger and exchange heat. Accumulated on the underside of the vessel, there was a risk that the cooling efficiency would deteriorate.

Further, in this type of vertical shaft pump, a discharge cover is often provided between the main flow path and the sub flow path at the upper part of the elbow pipe in order to improve efficiency, but the water flow in the sub flow path decreases during pump operation. Since it becomes difficult to discharge air, there is a problem that the discharge cover cannot be attached and the efficiency is lowered.

From the viewpoint of heat conduction near the heat exchanger, if an air reservoir (air layer) is present on the lower surface of the heat exchanger, if there is no air, water-air-in contrast to heat transfer of only the heat exchanger. It becomes a two-stage heat transfer of the heat exchanger, and the thermal resistance element increases. The thermal conductivity of water, air and copper used in general heat exchangers at normal temperature and pressure is 0.61 [W / (m · K)] and 0.026 [W / (m · K)], respectively. It is significantly different from about 370 [W / (m · K)]. In addition, since the heat transfer coefficient between air and the heat exchanger is considerably smaller than the heat transfer coefficient between water and the heat exchanger, the heat transfer coefficient on the heat transfer surface of the heat exchanger is large when air is present. The heat exchange efficiency is also significantly reduced.

When the vicinity of the heat exchanger is a watertight structure, water (pumping water) stagnates near the heat exchanger, and the flow velocity directly under the heat exchanger is slower than the main flow velocity from the pump suction port to the discharge port. Therefore, the heat transfer coefficient on the lower surface of the heat exchanger is small, and if foreign matter, cloth dust, air, etc. accumulate as described above, it becomes a factor that further lowers the heat transfer coefficient of the heat exchanger, and further heat. It reduces the efficiency of exchange.

The present invention has been made in view of the above situation, and by allowing a part of pumped water to flow out from between the first flange of the pump casing and the second flange of the motor portion, positively in the vicinity of the lower surface of the heat exchanger. A vertical pump with a structure that can increase the efficiency of the heat exchanger and sufficiently cool the motor by creating a water flow and eliminating accumulated air and foreign matter to improve the heat transfer rate. The purpose is to provide. In addition, in this specification, pumping and water are not limited to H2O, but mean the liquid to be pumped by a pump.

According to one aspect of the present invention, the vertical pump is a vertical pump that guides water from a suction port opened downward to a side discharge port facing the upper part of the pump, and is connected to a suction pipe portion and the upper portion of the suction pipe portion. It is composed of a bend pipe portion, a motor portion located above the bend pipe portion, and a chamber portion.
The suction pipe portion includes a suction pipe, a spindle extending in the suction pipe in a substantially vertical direction, an impeller fixed to the spindle, and a bearing portion that supports the spindle.
The bend pipe portion includes a connection pipe portion connected to the suction pipe, a discharge pipe facing the side of the connection pipe portion, a discharge flange, and a first flange located above the suction port. And have
The motor unit has a motor housing, a second flange provided at the lower part of the motor housing, a heat exchanger provided at the lower part of the motor housing, and an output connected to the spindle through the heat exchanger. With a shaft,
The first flange and / or the second flange has a drainage means for discharging water to the outside, and at least a part of the outer peripheral portion of the first flange and / or the second flange is in contact with the drainage. Flange,
Provided is a pump characterized in that the chamber portion has a first flange of the bend pipe portion, a second flange of the motor portion, a chamber cover, and a drain pipe having an opening in the chamber portion. To.

The suction pipe portion may have a bell portion having a suction port opened at the lower part of the suction pipe, or may have a guide vane.

The bend pipe portion may have a discharge cover.

As the motor unit motor, a water resistant motor having an impeller inside and having an intercooling system in which the coolant is circulated inside the motor by the impeller may be used.

By providing a drainage means capable of allowing water or air to flow out to the outside, new water pumped by the pump can be continuously contacted with the heat exchanger to exchange heat, and the pump can be cooled efficiently. Further, by providing the chamber, a part of the outside of the motor housing other than the heat exchanger can also come into contact with the drainage and exchange heat, so that the cooling efficiency is improved.

The drainage means is a groove or the like that opens in at least one joint surface of the first flange and / or the second flange. Further, the drainage means has a groove having a rectangular, semicircular or triangular cross-sectional shape, or any uneven shape such as a polygonal prism, a cylinder, or a hemisphere formed on the first flange and / or the second flange surface. It may be a gap formed by.

Further, a groove, which is a drainage means, or a parallel, radial, or wavy concave groove or convex shape may be formed, and the direction and direction of the groove or uneven shape formed by them can be arbitrarily set.

For example, in the drainage means, the upper surface in the vicinity of the drainage means is lowered in the vicinity of the rotating shaft, and the outlet side position of the draining means is placed high, so that air and light dust that easily collect in the center of the rotating shaft can be easily discharged. it can.

The outer diameter of the first flange is larger than the outer diameter of the second flange, and the chamber cover has a first surface extending in the outer diameter direction from the side surface of the motor housing, and the first surface and the first flange. It may have a second surface extending from the upper surface.

The outer diameter of the first flange is larger than the outer diameter of the second flange, and the chamber cover has a ceiling surface located above the motor housing and a second extending from the ceiling surface and the upper surface of the first flange. It may have a surface.

The outer diameter of the first flange is larger than the outer diameter of the second flange, and the chamber cover has a first surface extending in the outer diameter direction from the side surface of the second flange, and the first surface and the first flange. It may have a second surface extending from the upper surface.

The outer diameter of the second flange is larger than the outer diameter of the first flange, and the chamber cover has a first surface extending in the outer diameter direction from the side surface of the first flange, and the first surface and the second flange. It may have a second surface extending from the lower surface of the.

The outer diameter of the second flange is larger than the outer diameter of the first flange, and the chamber cover has a first surface extending in the outer diameter direction from the lower surface of the first flange, and the first surface and the second flange. It may have a second surface extending from the lower surface.

It is desirable that the water discharged into the chamber via the drainage means after heat exchange in the heat exchanger of the motor section further cools at least a part of the motor section.

It has an opening in the chamber and is provided with a drainage pipe that is open to the outside. Further, as for the chamber side opening of the drain pipe, the opening on the outer peripheral side or the upper surface side of the chamber, or the opening extended from the lower surface side is located above the inside of the chamber, and the opening of the drain pipe is the upper surface of the heat exchanger. It is desirable to install it at a position higher than the upper part of the drainage means. That is, it is desirable that the drainage pipe connecting the inside and the outside of the chamber portion is installed at a position where the chamber side opening of the drainage pipe is higher than the upper surface of the heat exchanger or the upper part of the drainage means. By arranging it high, the water level in the chamber becomes higher than the uppermost level of the heat exchange section during operation, the heat exchange section is submerged, and the heat exchange efficiency is good. In addition, the air contained in the wastewater and light small dust can be discharged from the chamber.

Further, it is desirable that the other opening of the drain pipe is installed so as to be sufficiently above the liquid level in the suction water tank during normal operation. Drainage resistance can be reduced and water flow can be increased.

Further, when a bent portion is provided in the middle of the drain pipe, it is preferable to have a curvature and a space inner diameter as large as possible so that foreign matter is not caught in the portion. Specifically, the drain pipe connecting the inside and the outside of the chamber portion. It is preferable that the bent portion of the drainage pipe has a curvature larger than the narrowest gap length of the drainage means or a space larger than the minimum inscribed ball diameter of the space.

Further, it is desirable that the chamber portion is provided with an inspection window at a position where the inside of the chamber portion and / or the opening of the drain pipe can be visually recognized. Further, the inspection window may be replaced with an inspection door that can be opened, and it is desirable that dust and the like can be removed inside the chamber. By installing these, maintenance becomes easy.

Further, it is desirable that the chamber portion or the drain pipe portion is provided with an opening through which air can pass, and it is further desirable that the opening is provided at a position higher than the chamber portion. It is also desirable to have a valve in the opening. Air can be evacuated from the chamber, improving cooling efficiency. In particular, when the drain pipe passes through a position higher than the chamber, the air can be easily evacuated by providing the valve for bleeding air at the high position.

Further, it is desirable to adopt a solenoid valve with a waterproof function that can be remotely controlled because the valve has a water resistant function that can operate even when submerged in water.

A flow meter may be provided in the drain pipe. By measuring the flow rate in the drain pipe with a flow meter, it is possible to monitor the ditch, the clogging of the drain pipe, and the operating condition of the pump. Furthermore, in order to prevent the function of the flow meter from being lost due to flooding on the floor where the pump is installed, various types of flow meters can be used, but it is desirable that the flow meter has a signal output that can be observed remotely, and it can be used even when flooded. It is preferable to select a waterproof type. Further, a water temperature gauge can be used instead of the flow meter. In this case, the operating status can be confirmed by comparing and monitoring the pumping temperature and the water temperature in the drain pipe. It is preferable to select a waterproof water temperature gauge such as a connector as in the flow meter.

Further, as the motor of the motor unit, a water resistant motor having an impeller inside and having an intercooling system in which the coolant is circulated inside the motor can be used, and a temperature sensor is used in the coolant flow path. May be installed. By setting the upper or lower limit of the temperature sensor output, it is possible to detect a cooling abnormality by using a system that issues a warning, and it is possible to control or stop the pump system before an abnormally serious failure occurs. In addition, when a plurality of pump systems are used, the output of other pumps can be adjusted for coordinated operation so that the entire pump system can be operated without degrading its performance.

A flow path branched from the drain pipe, a first valve provided on the downstream side of the branch point of the drain pipe with the flow path, a second valve provided on the flow path, and a flow path provided on the flow path. It may have a flushing pump. From now on, these will be called flushing systems. The pump installation floor of the pump station is often unmanned, and the electric valve is preferable so that the valve can be opened and closed by remote control or remote control from the pump operation room, and the electric valve loses its function due to flooding on the pump installation floor. When installing a valve or a flushing pump below the water level where inundation is expected, it is preferable to select a waterproof type.
Further, since pumped water containing foreign matter and the like always passes through the second valve during pump operation, a sluice valve, a ball valve, a funnel valve, etc. having a large valve opening cross section when the valve is opened are preferable.

When the drain pipe is clogged with foreign matter or the like, the first valve is closed, the second valve is opened, water is sent to the drain pipe side through the flow path by a flushing pump, and water flows back from the drain pipe to the drain means. By this water flow, foreign matter or the like can be returned to the chamber, and further returned to the main flow path suction port through the drainage means and the sub flow path pipe portion. Further, it is desirable that the lower surface of the chamber and the lower surface of the drainage means have a surface lowered toward the opening with the sub-flow path of the drainage means, so that the structure is such that water does not collect in the chamber during flushing and is easily drained to the pump side. .. In addition, this structure can prevent puddles (dead water) before the pump is started, and is also effective in preventing bad odors.

Furthermore, the flushing pump is sufficiently higher than the pumping pressure of the sub-channel pipe in consideration of the pipeline loss to the sub-channel pipe so that the flushing system can be used even when the vertical pump is in operation. It is preferable to select a pump that can discharge the pressure. The inner diameter of the drainage pipe is preferably larger than the particle size that allows foreign matter or the like that has passed through the drainage means to pass through the drainage means so as not to be clogged in the drainage pipe. In many pump stations, there is a dust remover before the water flows into the suction tank, and the dust remover removes large foreign matter. Therefore, the particle size of foreign matter and the like contained in the water pumped by the pump can be assumed based on the screen mesh width of the dust remover.

The bend portion extending upward from the suction pipe side and forming the main flow path toward the side discharge flange has a first flange at the upper end opening of the suction pipe opening and sucks. There is a spindle or an output shaft penetrating from the pipe side in the direction of the first flange, and a second impeller may be attached to the spindle or the output shaft. The second impeller generates a water flow from the lower side of the first flange toward the first flange, and the water flow efficiently sends water, air, and small foreign substances to the outside from the drainage means formed on the first and second flanges. Since it can be discharged, the cooling efficiency is improved.

Further, the second impeller not only generates a water flow in the direction of the first flange, but also has a blade forming portion having a foreign matter crushing function in a part of the second impeller so that the impeller and its facing fixed side are connected to each other. The structure may be such that foreign matter can be cut between them. A rotary blade may be attached instead of the second impeller, and it may have only a crushing function without particularly providing a water flow generating function. In that case, the crushed foreign matter will be discharged due to the pressure difference between the water pressure generated by the pump, the pressure inside the chamber, the pressure at the opening of the drain pipe, and the pipe resistance from the sub-flow pipe to the opening of the drain pipe. ..

In addition, if the opening diameter directly under the heat exchanger is narrowed down to be smaller than the inner diameter of the subchannel pipe, air and light dust that tend to collect at the center of the rotating shaft near the center of the heat exchanger can be guided to the drainage means by a water flow with a high flow velocity, and the chamber, It can be discharged to the outside through a drain pipe.

Needless to say, it is desirable that the pump equipment such as the drive device and the discharge valve have waterproof, remote control or observable specifications that can be utilized even when flooded. It can be used as a drainage system that can be operated remotely by supplying a drive power supply and control signals from the outside.

Since a part of the pumped water can pass between the first flange of the bend pipe portion and the second flange of the motor portion in the pump, fresh pumped water is supplied to the heat exchanger provided near the second flange of the motor portion. It is possible to supply and discharge accumulated air and foreign matter, efficiently cool the motor, and prevent malfunction due to overheating, abnormal operation stop, efficiency decrease, and increase in required power.

Schematic diagram of the pump according to the first embodiment. The main part of the pump according to the first embodiment. A cross-sectional view of the first flange in FIG. 2 according to the first embodiment. A cross-sectional view of a flange which is a modification of FIG. 3A according to the first embodiment. The figure of the vicinity of the heat exchanger 19 seen from the impeller 9 side which concerns on 1st Embodiment. The figure which shows the example of the drainage means 22. The figure which shows the example of the drainage means 22. The figure which shows the example of the drainage means 22. The figure which shows the example of the drainage means 22. BB sectional view of the chamber according to the first embodiment. A view of the vicinity of the chamber portion, which is a modification of FIGS. 1 and 2. The vicinity view of the chamber part which is a modification of FIG. FIG. 6 is a view of the vicinity of the chamber portion, which is a modified example of FIG. FIG. 6 is a view of the vicinity of the chamber portion, which is a modified example of FIG. FIG. 6B is a cross-sectional view taken along the line AA. A view of the vicinity of the chamber portion, which is another modification of FIG. A view of the vicinity of the chamber portion, which is another modification of FIG. A view of the vicinity of the chamber portion, which is another modification of FIG.

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

FIG. 1 is a schematic view of the pump according to the first embodiment, and FIG. 2 is a main part of the pump according to the first embodiment. This pump is, for example, a vertical shaft pump arranged in a drainage pump station, and is a pump that guides water from a suction port 1 that opens downward to a discharge port 2 that faces the upper side of the pump, and has a suction pipe portion 3 and a suction pipe portion 3. It is composed of a bend pipe portion 4 connected to the upper part of the suction pipe portion 3, a motor portion 5 located on the upper part of the bend pipe portion 4, and a chamber portion 6, and the suction pipe portion 3 is opened at the lower part of the suction pipe 12. A bell portion 7 having a pumped suction port 1, a spindle (rotating) shaft 8 extending in a substantially vertical direction in the suction pipe portion 3, an impeller 9 fixed to the spindle 8, and a bearing portion supporting the spindle 8. It has a 10, a guide vane 11, and a suction pipe 12.

The bend pipe portion 4 includes a connection pipe portion 13 connected to the suction pipe 12, a discharge pipe 14 facing the side of the connection pipe portion 13, a discharge flange 15, and a discharge cover 16. A first flange 17 located above the suction port 1 is provided, and the motor unit 5 has an impeller (not shown) inside, and the impeller circulates the coolant inside the motor unit 5. A water resistant motor (not shown) having an intercooling system that exchanges heat with an external heat source in a part of the circulation path, a motor housing 18, a heat exchanger 19 provided under the motor housing 18, and the motor housing 18. It has a lower portion, a heat exchanger 19, or a second flange 20 provided integrally with the lower portion of the motor housing 18 and the heat exchanger 19, and an output shaft 21 connected to the main shaft 8 through the heat exchanger 19. The first flange 17 has a drainage means 22 such as a water channel for draining water to the outside on a part of the mating surface with the second flange 20, and when the drainage means is utilized, the second flange 17 is used. The outer peripheral portion of the flange 20 is in contact with the drainage, and the chamber portion 6 is inside the first flange 17 of the bend pipe portion 4, the second flange 20 of the motor portion 5, the chamber cover 23, and the chamber portion 6. It is composed of a drain pipe 24 having an opening.

It is desirable that the drainage pipe 24 is provided with a flow meter 24b and a drainage water temperature gauge 24c, and the connection pipe portion 13 is provided with a pumping water temperature gauge 24d. By measuring the flow rate in the drain pipe 24 with the flow meter 24b, it is possible to monitor the clogging of the drain means 22 and the drain pipe 24 and the operating status of the pump. Further, the operating status can be confirmed by comparing and monitoring the water temperature in the drainage pipe 24 and the water temperature in the suction pipe 12 with the drainage water temperature gauge 24c and the pumping water temperature gauge 24d.

Further, in general, a discharge valve is often provided in the piping after the discharge port 2, but here, up to the discharge port 2 will be described. It should be noted that devices that can be driven or controlled, including this discharge valve, can be driven by remote controllable electricity, air, and flood control, and are preferably waterproof. Needless to say, they can be operated and controlled even when flooded. No.

The impeller 9 can be rotated by rotating the motor in the motor unit 5. At this time, the motor generates heat, and the heat is transferred to the heat exchanger 19 and the motor housing 18. On the other hand, due to the rotation of the impeller 9, water is sucked up from the suction port 1 and drained from the discharge port 2. At that time, a part of the water sucked up from the suction port 1 reaches the lower surface of the heat exchanger 19, and the heat exchanger 19 is cooled by the heat exchange function of the heat exchanger 19, and as a result, the heat generated by the motor is taken away. After that, this water is discharged into the chamber portion 6 through the drainage means 22 such as a groove, and further cools at least a part of the motor portion 5 such as the motor housing 18. It is also possible to attach fins to the motor housing 18 located in the chamber to improve the cooling effect. The water that has entered the chamber is finally drained to the water tank on the suction side and the discharge side.

3a and 3b are cross-sectional views taken along the line AA of FIG. 2 and exemplify the drainage means 22. The drainage means 22 is a groove 22a or the like that opens in the joint surface between the first flange 17 and the second flange 20, and may be provided on the second flange side or both in addition to the groove formed by the first flange of this example. It is possible. FIG. 3c is a view of the vicinity of the heat exchanger 19 as seen from the impeller 9 side. A groove 19a may be formed in the heat exchanger 19 according to the position of the drainage means 22.

Further, when the drainage means 22 has a groove 22a such as a groove having a rectangular, semicircular, triangular, or wavy cross section (FIGS. 3d to 3g) or an arbitrary uneven portion shape formed on the two flange surfaces, the surface is matched. The formed gap can also be used. Further, the shape of the groove or uneven portion of the drainage means 22 can be arbitrarily set such as parallel or radial, and the direction and direction of the groove or gap. Further, the shape of the uneven portion may be of a plurality of types such as a polygonal column such as a hexagonal column, a rectangular parallelepiped, a cylinder, and a hemisphere. As shown in FIG. 3a, the first flange 17 is formed with a hole 17a for the chamber cover fixing bolt 25 (see FIG. 2) and a hole 17b for the drain pipe 24.

FIG. 4 is a cross-sectional view taken along the line BB of FIG. The chamber cover 23 is formed with a through hole 23a for the chamber cover fixing bolt 25 (see FIG. 2). As shown in FIG. 2, the chamber cover fixing bolt 25 penetrates the through hole 23a of the chamber cover 23 and is fastened to the screw hole of the first flange 17, or to the through hole 17a when fastened with a nut from the back surface. ..

The drainage means 22 may be a radial groove installed on the joint surface between the first flange 17 and the second flange 20, and for example, a disc of another piece having a radial groove is incorporated in the recess of the first flange 17. It can also be realized by assembling.

After incorporating the groove of the separate piece, the shape may be such that the vicinity of the main shaft (rotating shaft) on the upper surface side is low and the discharge side position such as the outer circumference is high. When draining, air and light dust that tend to collect at the center of the rotating shaft can be easily drained by moving them upward using buoyancy.

As shown in FIG. 2, the outer diameter of the first flange 17 is larger than the outer diameter of the second flange 20, and the chamber cover 23 is a first surface extending in the outer diameter direction from the vicinity of the side surface of the motor housing 18. 26, the first surface 26, and a second surface 27 extending from the upper surface of the first flange 17 may be provided.

The water discharged into the chamber portion 6 via the drainage means 22 after heat exchange in the heat exchanger 19 of the motor portion 5 is at least a part of the motor portion 5, for example, a second of the motor housing 18. The outer periphery of the flange 20 can be further cooled.

Further, the drainage pipe 24 is larger than the maximum opening diameter of the drainage means 22, and the inlet of the drainage pipe 24 is located at a position outside the discharge pipe position of the bend pipe portion 4 when viewed from the upper part of the pump, preferably on the opposite side. It is installed in the chamber portion 6 to be installed, and the opening in the chamber is located relatively upper in the chamber portion 6 and is installed at a position higher than the heat exchanger 19. That is, the drain pipe 24 is installed at a position where the opening on the chamber portion 6 side is higher than the upper surface of the heat exchanger 19 or the upper portion of the drain means 22. Further, a filter such as a wire mesh for preventing foreign matter from being mixed may be provided in the opening.

Further, the drain pipe 24 is composed of a straight pipe without a bent portion, penetrates the first flange 17 from the chamber portion 6 side, further penetrates the pump floor, and opens above the water surface in the suction water tank during normal operation. May be installed. When the drain pipe 24 is provided with a bent portion, it is preferable that the bent portion has a curvature or a space inner diameter larger than the gap length of the drainage means 22 from the viewpoint of preventing foreign matter clogging.
Further, a waterproof solenoid valve 24a is installed in the drain pipe 24.

Further, the chamber cover 23 is provided with an inspection window 28 at a position where the inside of the chamber portion 6 and / or the opening of the drain pipe 24 can be visually recognized, and a hand is put inside the chamber portion 6 for maintenance work. An openable inspection door may be installed to perform the above, and in that case, a highly pressure-resistant and airtight one that can withstand the water pressure of the pump is desirable.

Further, an opening through which air can pass may be provided in the upper part of the chamber cover 23. An air pipe 29 is connected to the opening, and a solenoid valve 30 with a waterproof function that is provided at a position higher than the chamber portion 6 and has a water resistant function that can operate when submerged and can be remotely controlled is provided. Is desirable. In addition, a waterproof water detection sensor (not shown) is installed in the middle of the pipe. After the pump is driven, the opening and closing of the solenoid valve 30 is controlled for a certain period of time or by using the water detection sensor as a trigger, and the air remaining at the start of operation is discharged to the auxiliary flow path pipe portion 31, the drainage means 22, and the chamber portion 6, and then discharged. It will be sealed later.

Further, a water pipe through which water can pass is connected to the upper part of the chamber cover 23, and a solenoid valve with a waterproof function that can be operated remotely and has a water resistant function that can operate when submerged in the middle of the pipe (not shown). May be installed. In addition, a pump and a water pipe or a water tank for cleaning are connected to the tip.

When foreign matter is clogged near the drainage means 22 or the heat exchanger 19, the foreign matter is determined by the temperature, voltage, electric power of the motor, the cooling water temperature inside the motor, the flow meter 24b installed in the drainage pipe 24, the thermometer 24c, or the like. That is, it detects.

A thermocouple or resistance temperature detector can be used as the thermometer, and the thermometer can be input to the control device via a temperature transmitter. Further, as the flow meter, an electromagnetic flow meter or the like can be used.

After the detection, the solenoid valve 30 of the drain pipe 24 and the air pipe 29 is closed, the pump connected to the water pipe is started, the solenoid valve of the water pipe is opened, the washing water is introduced into the chamber portion 6, the drain means 22, heat exchange. Water can flow back into the vessel 19, foreign matter can be returned to the subchannel pipe portion 31, and discharged from the main channel.

A flow path branched from the drain pipe 24, a first valve provided on the downstream side of the branch point of the drain pipe 24 with the flow path, a second valve provided in the flow path, and the flow path. It may have a flushing pump provided in. From now on, these will be called flushing systems.

The pump installation floor of the pump station is often unmanned, and the electric valve is preferable so that the valve can be opened and closed by remote control or remote control from the pump operation room, and the electric valve loses its function due to flooding on the pump installation floor. When installing a valve or a flushing pump below the water level where inundation is expected, it is preferable to select a waterproof type.
Further, since pumped water containing foreign matter and the like always passes through the second valve during pump operation, a sluice valve, a ball valve, a funnel valve, etc. having a large valve opening cross section when the valve is opened are preferable.

When the drain pipe 24 is clogged with foreign matter or the like, the first valve is closed, the second valve is opened, water is sent to the drain pipe 24 side through the flow path by a flushing pump, and water is sent from the drain pipe 24 to the drain means 22. To flow backward. Foreign matter and the like can be returned to the chamber by this water flow, and further returned to the subchannel pipe portion through the drainage means.

The flushing pump has a pressure sufficiently higher than the pumping pressure of the subchannel pipe 31 in consideration of the pipeline loss up to the subchannel pipe 31 so that the vertical pump can flow back even when the vertical pump is in operation. It is preferable to select a pump capable of discharging. The inner diameter of the drain pipe 24 is preferably larger than the particle size that allows foreign matter or the like that has passed through the drainage means 22 to pass through the drainage means 24 so as not to be clogged in the drainage pipe 24. In many pump stations, there is a dust remover before the water flows into the suction tank, and the dust remover removes large foreign matter. Therefore, the particle size of foreign matter contained in the water pumped up can be determined based on the screen mesh width of the dust remover.

FIG. 5 is a view of the vicinity of the chamber portion, which is a modification of FIGS. 1 and 2, and shows a cross section of the vicinity of the chamber portion 6. The bend pipe portion 4 extending upward from the suction pipe 12 side and forming a main flow path toward the side discharge flange 15 has a first flange 17 at the upper end opening of the suction pipe 12 opening. There is a main shaft 8 or an output shaft 21 penetrating from the suction pipe 12 side in the direction of the first flange 17, and the second impeller 32 may be attached to the main shaft 8 or the output shaft 21. The second impeller 32 generates a water flow from the lower side of the first flange 17 toward the first flange 17, and the water flow efficiently externals water from the drainage means 22 formed on the first flange 17 and the second flange 20. Cooling efficiency is improved because it can be discharged to the flange.

Further, the second impeller 31 not only generates a water flow in the direction of the first flange 17, but also has a blade forming portion 33 (rotating side of the foreign matter crushing function) having a foreign matter crushing function in a part of the second impeller 31. The structure may be such that foreign matter can be cut between the second impeller 32 and the fixed side 34 (of the foreign matter crushing function) facing the second impeller 32.

Further, if the opening diameter directly under the heat exchanger 19 is narrowed down, air and light dust that tend to collect at the center of the rotating shaft near the center of the heat exchanger 19 are guided to the drainage means 22 by a water flow, and are passed through the chamber portion 6 and the drainage pipe 24. Can be discharged to the outside.

FIG. 6 is a view of the vicinity of the chamber portion, which is a modification of FIG. 2. The outer diameter of the first flange 17 is larger than the outer diameter of the second flange 20, and the chamber cover 23 has a ceiling surface 35 located above the motor housing 18, the ceiling surface 35, and the first. It may have a second surface 36 extending from the upper surface of the flange 17. Further, the ceiling surface 35 may be provided with an inspection window 35a that can be opened and closed.

FIG. 6A is a view of the vicinity of the chamber portion, which is a modified example of FIG. A drainage pipe 24 communicating with the chamber portion 6 may be provided on the ceiling surface 35. The drain pipe 24 can also serve as an air vent pipe. In this case, the drain pipe 24 is provided with at least two bent portions. In such a case, it is preferable to have a curvature and a space inner diameter as large as possible so that foreign matter is not caught in the bent portion. Specifically, in the drain pipe 24, the bent portion of the drain pipe 24 is the drain means 22. It is preferable to have a curvature larger than the narrowest gap length or a space larger than the minimum inscribed sphere diameter of the space.

FIG. 6B is a view of the vicinity of the chamber portion, which is a modified example of FIG. 6C is a cross-sectional view taken along the line AA of FIG. 6B. As shown in these figures, cooling fins 18a extending outward from the outer peripheral portion of the motor housing 18 can be attached to improve the cooling effect.

FIG. 7 is a view of the vicinity of the chamber portion, which is another modification of FIG. 2. The outer diameter of the first flange 17 is larger than the outer diameter of the second flange 20, and the chamber cover 23 includes a first surface 36 extending in the outer diameter direction from the side surface of the second flange 20 of the motor housing 18. It may have a first surface 36 and a second surface 37 extending from the upper surface of the first flange 17.

FIG. 8 is a view of the vicinity of the chamber portion, which is another modification of FIG. 2. The outer diameter of the second flange 20 is larger than the outer diameter of the first flange 17, and the chamber cover 23 has a first surface 36'extending from the side surface of the first flange 17 in the outer diameter direction, and the first surface 36'. It may have a surface 36'and a second surface 37'extending from the lower surface of the second flange 20.

FIG. 9 is a view of the vicinity of the chamber portion, which is another modification of FIG. 2. The outer diameter of the second flange 20 is larger than the outer diameter of the first flange 17, and the chamber cover 23 has a first surface 36'' extending in the outer diameter direction from the lower surface of the first flange and the first surface. And may have a second surface 37'' extending from the lower surface of the second flange 20.

Needless to say, it is desirable that the pump equipment such as the drive device and the discharge valve have waterproof specifications that can be utilized even when flooded. It can be used as a drainage system that can be operated remotely by supplying a drive power supply and control signals from the outside.

When the water level of the suction water tank reaches the upper part of the impeller 9, the motor is started and the output shaft 21 of the motor starts to rotate. Since the output shaft 21 is fixed to the spindle 8 (shaft) via a joint, the rotation of the output shaft 31 is transmitted to the impeller 9 located at the lower end fixed to the spindle 8, and the rotation of the impeller 9 is accompanied by the rotation of the impeller 9. The water in the suction water tank is pumped up, passed through the suction pipe portion 3, and drained from the discharge port 2 of the bend pipe portion 4.

At the time of this operation, the air in the main flow path before the start is discharged by pumping in the main flow path, and after the main flow path is filled with the pumped water, the air is discharged from the discharge port 2. On the other hand, when the upper part of the sub-flow path pipe portion 31 has a watertight structure, the sub-flow path is above the main flow path, so that the air that was present at the time of starting is not easily discharged and remains.

On the other hand, in the present invention, since the upper part of the sub-flow path pipe portion 31 is not watertight, when pumping is started and the pressure of the suction pipe portion 3 and the bend pipe portion 4 increases, the sub-channel pipe portion is exerted by the force. Air escapes from the upper part of 31. Further, after the air is released, it is filled with pumped water, and the pumped water touches the heat exchanger 19 to remove the heat generated by the rotating motor, so that efficient heat exchange can be performed.

1 Suction port 2 Discharge port 3 Suction pipe part 4 Bend pipe part 5 Motor part 6 Chamber part 7 Bell part 8 Main shaft 9 Impeller 10 Bearing part 11 Guide vane 12 Suction pipe 13 Connection pipe part 14 Discharge pipe 15 Discharge flange 16 Discharge cover 17 1st flange 17a Hole 17b Hole 18 Motor housing 18a Cooling fin 19 Heat exchanger 19a Groove 20 2nd flange 21 Output shaft 22 Drainage means 22a Groove 23 Chamber cover 23a Through hole 24 Drainage pipe 24a Electromagnetic valve 24b Flow meter 24c Drainage thermometer 24d Pumping thermometer 25 Chamber cover fixing bolt 26 1st surface 27 2nd surface 28 Inspection window 29 Air pipe 30 Electromagnetic valve 31 Sub-channel pipe part 32 2nd impeller 33 Blade forming part (foreign matter crushing) (Rotating side of function)
34 Fixed side of foreign matter crushing function 35 Ceiling surface 36 First surface 37 Second surface

Claims (11)

A vertical pump that guides water from a suction port that opens downward to a discharge port that faces the side of the upper part of the pump, and is a suction pipe part, a bend pipe part that is connected to the upper part of the suction pipe part, and the bend pipe. It is composed of a motor part located at the upper part of the part and a chamber part.
The suction pipe portion includes a suction pipe, a spindle extending in the suction pipe in a substantially vertical direction, an impeller fixed to the spindle, and a bearing portion that supports the spindle.
The bend pipe portion includes a connection pipe portion connected to the suction pipe, a discharge pipe facing the side of the connection pipe portion, a discharge flange, and a first flange located above the suction port. And have
The motor unit includes a motor that rotates the impeller, a motor housing, a second flange provided at the lower part of the motor housing, and a heat exchanger provided at the lower part of the motor housing to take away heat generated by the motor. With an output shaft that is connected to the spindle through the heat exchanger,
Wherein the first flange and / or the second flange, the water is discharged to the outside has a drainage means order cause water flow in the vicinity of the bottom face of the heat exchanger, said a chamber portion of the first flange And / or the outer peripheral portion of the second flange is in contact with the drainage discharged from the drainage means .
The pump is characterized by having a first flange of the bend pipe portion, a second flange of the motor portion, a chamber cover, and a drain pipe having an opening in the chamber portion. The pump according to claim 1, wherein the drainage means is a groove that opens in at least one joint surface of the first flange and / or the second flange. Claim 1 or 2 characterized in that the drainage means is a rectangular, semicircular or triangular groove, or a gap formed in the shape of a concavo-convex portion formed on the first flange and / or the second flange. The pump described in. The outer diameter of the first flange is larger than the outer diameter of the second flange, and the chamber cover has a first surface extending in the outer diameter direction from the side surface of the motor housing, and the first surface and the first flange. The pump according to any one of claims 1 to 3 , wherein the pump has a second surface extending from an upper surface. The outer diameter of the first flange is larger than the outer diameter of the second flange, and the chamber cover extends from the ceiling surface located above the motor housing, the ceiling surface, and the upper surface of the first flange. The pump according to any one of claims 1 to 3 , wherein the pump has a surface. The outer diameter of the first flange is larger than the outer diameter of the second flange, and the chamber cover has a first surface extending in the outer diameter direction from the side surface of the second flange of the motor portion, and the first surface and the first surface. 1 The pump according to any one of claims 1 to 3 , further comprising a second surface extending from the upper surface of the flange. Claims 1 to 6 are characterized in that water discharged into the chamber portion via the drainage means after heat exchange by the heat exchanger of the motor portion cools at least a part of the motor portion. The pump described in any of. The drainage tube connecting the chamber portion and the outer, chamber-side opening of the drain pipe, according to claim 1 to 7, characterized in that it is installed at a position higher than the top of the heat exchanger top or drainage means The pump described in either. The pump according to any one of claims 1 to 8 , wherein the chamber portion is provided with an inspection window that allows the inside of the chamber portion and / or the opening of the drain pipe to be visually recognized. The pump according to any one of claims 1 to 9 , wherein the pump has a second impeller attached to the main shaft or the output shaft. The second impeller pump according to claim 1 0, characterized in that it has a blade having a foreign matter crushing function part.

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