JP2022048527A - Vertical shaft pump - Google Patents

Abstract

To provide a vertical shaft pump which eliminates a need to install a pump at the outside, enables a bearing to be cooled at low costs, and can prevent damage of the bearing by earth and sand.SOLUTION: The vertical shaft pump includes: a spindle 3 in which an impeller 2 is attached to a lower end and which is rotationally driven; a casing 5 which rotatably supports the spindle through a bearing 4 and has a suction port 5a for suctioning raw water at an end part; and a raw water supply mechanism 6 which supplies the raw water to the bearing. The raw water supply mechanism includes: a filter 7 which removes dirt or mud in the raw water and filters the raw water before the raw water is supplied to the bearing; a filtered water compression pump part 8 which is provided at a lower part of the spindle and compresses the raw water by rotation of the spindle before or after the raw water is supplied to the bearing; and a discharge passage 9 which may discharge the raw water compressed by the filtered water compression pump part from the inside of the casing to the outside of the casing.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vertical shaft pump capable of cooling a bearing that rotatably supports a spindle with an impeller attached to the lower end.

In a vertical shaft pump, a spindle with an impeller attached to the lower end is rotatably supported by a bearing, but usually, lubricating water is supplied to the bearing to cool it in order to suppress heating of the bearing. Conventionally, this lubricating water is other-pressure water such as tap water, and an external pump for other-pressure water is installed outside the vertical shaft pump to supply the lubricating water.

For example, Patent Document 1 describes a vertical shaft pump device provided with a cooling mechanism for supplying cooling water (lubricating water) to a bearing that supports a spindle covered with a protective tube.
This vertical shaft pump device is equipped with a water supply tank, a water supply pump, a water supply pipe, and a cooling control unit. It is supplied from the lower end of.

Further, Patent Document 2 includes a protection pipe that includes and fixes an underwater bearing that supports the rotating shaft, and a communication pipe that communicates the protection pipe and the outside of the vertical shaft pump, and lubricates water from the communication pipe into the protection pipe. The underwater bearing structure for sending water is described. Even in this submersible bearing structure, the lubricating water is stored in a water tank provided on the installation floor outside the vertical pump, and is sent to the communication pipe by the submersible pump.

Japanese Unexamined Patent Publication No. 2014-190207 Japanese Unexamined Patent Publication No. 2016-17420

The following problems remain in the above-mentioned conventional technique.
The conventional techniques described in Patent Documents 1 and 2 have the disadvantage that it is necessary to install an external pump in order to supply the lubricating water as other pressure water such as tap water, resulting in high cost. There is also a method of integrating the pump with the submersible motor, but the submersible motor is inferior in durability and expensive, so that the cost also increases. Furthermore, it was difficult to supply tap water as lubricating water where no water pipe was installed.
In vertical diagonal flow pumps that use ceramic bearings and resin bearings, they have been used by self-circulation using raw water, which is a method generally called non-injection bearing, but in large quantities during floods such as heavy rain. There was a problem that the bearings would be damaged if the earth and sand of the earth flowed into the inside together with the raw water (river water). That is, there is a problem that earth and sand in the raw water, which has become muddy water, accumulates in the groove of the bearing body that supports the spindle, and the water circulation is interrupted, causing overheating and damage.

The present invention has been made in view of the above-mentioned conventional problems, and provides a vertical shaft pump capable of cooling a bearing at low cost without installing an external pump and preventing damage to the bearing due to earth and sand. The purpose is to do.

The present invention has adopted the following configuration in order to solve the above problems. That is, the vertical shaft pump according to the first invention has a spindle having an impeller attached to the lower end and being rotationally driven, and a casing having a water suction port at the end, which rotatably supports the spindle via a bearing and sucks up raw water. And a filter provided with a raw water supply mechanism for supplying the raw water to the bearing, and the raw water supply mechanism removes and filters dust or mud in the raw water before supplying the bearing, and a lower portion of the spindle. The filtered water pressurizing pump section that pressurizes the raw water before or after being supplied to the bearing by the rotation of the spindle, and the raw water pressurized by the filtered water pressurizing pump section are described above. It is characterized by having a discharge flow path capable of discharging from the inside of the casing to the outside of the casing.

In this vertical shaft pump, the raw water supply mechanism removes dust or mud from the raw water before supplying it to the bearing, and filters the raw water, and the raw water provided at the bottom of the spindle before or after being supplied to the bearing. The spindle rotates because it is equipped with a filtered water pressurizing pump section that pressurizes by the rotation of the spindle and a discharge flow path that can discharge the raw water pressurized by the filtered water pressurizing pump section from the inside of the casing to the outside of the casing. Then, the raw water pressurized by the filtered water pressurizing pump unit can be pushed out from the discharge flow path. Therefore, it is possible to discharge the raw cooling water supplied to the bearing to the outside of the casing without installing an external pump. In addition, since the raw water for cooling supplied to the bearing is filtered by a filter, it is possible to prevent dust and mud from adhering to the bearing and clogging it, and prevent damage to the bearing due to earth and sand. can do.

The vertical shaft pump according to the second invention is characterized in that, in the first invention, the filtered water pressurizing pump portion has a spiral groove or a rotating fin provided on the outer peripheral surface of the main shaft. ..
That is, in this vertical shaft pump, since the filtered water pressurizing pump portion has a spiral groove or a rotating fin provided on the outer peripheral surface of the spindle, when the spindle rotates, the spiral groove of the filtered water pressurizing pump portion Alternatively, the rotating fins can also be rotated to pressurize the surrounding raw water and push it out into the discharge flow path.

In the vertical shaft pump according to the third invention, in the first invention, the discharge flow path is formed inside the spindle along the spindle, and the filtered water pressurizing pump portion is formed inside the spindle. One end is open on the outer peripheral surface of the main shaft, and the other end is provided with a plurality of raw water introduction flow paths connected to the discharge flow path. It is characterized by being opened at an angle.
That is, in this vertical shaft pump, since a plurality of raw water introduction flow paths are opened by tilting the axis in the rotation direction of the main shaft, when the main shaft rotates, the surrounding raw water enters the raw water introduction flow path and is pressurized and discharged. Guided to the flow path.

In any one of the first to third inventions, the vertical shaft pump according to the fourth aspect of the invention includes a protective pipe in which the casing protects the spindle above the impeller by arranging the spindle and the bearing inside. The protective tube is provided with an outer casing portion in which the protective tube is housed inside together with the main shaft, and the raw water supply mechanism supplies the filtered raw water into the protective tube.
That is, in this vertical shaft pump, the casing is provided with a protective pipe inside which the spindle above the impeller and the bearing are arranged and protected inside, and the raw water supply mechanism supplies the filtered raw water into the protective pipe. Since the raw water supplied into the protective pipe cools the bearing and flows to the filtered water pressurizing pump portion at the lower part of the spindle, it is not necessary to separately provide a raw water supply pipe for the bearing.

In any one of the first to fourth inventions, the vertical shaft pump according to the fifth aspect of the invention has the discharge flow path arranged in the water suction port and the raw water at the lower end portion on the upper surface with respect to the central axis of the water suction port. It is characterized by having a swirling flow generating portion having a plurality of discharge ports in the circumferential direction for discharging in the clockwise direction visually.
That is, in this vertical shaft pump, the discharge flow path is arranged in the water suction port, and the lower end has a plurality of discharge ports in the circumferential direction to discharge the raw water in the clockwise direction with respect to the central axis of the water absorption port. Since it is equipped with a swirling flow generator, the clockwise swirling flow generated below the water absorption port cancels out the counterclockwise swirling flow that tends to occur during water absorption and suppresses the generation of vortices. be able to.

In any one of the first to fifth inventions, the vertical shaft pump according to the sixth aspect of the invention has the discharge flow path inside, protrudes downward from the water suction port, and discharges the raw water downward. It is characterized by having a lower ejection pipe.
That is, since this vertical shaft pump has an internal discharge flow path, protrudes downward from the water intake port, and has a lower jet pipe that discharges raw water downward, it is easy to deposit below the center of the water intake port. The earth and sand can be agitated and blown off by the raw water jetted downward from the lower ejection pipe as a jet jet, and stable drainage can be continued.

According to the present invention, the following effects are obtained.
That is, according to the vertical shaft pump of the present invention, the raw water supply mechanism is provided in a filter for removing and filtering dust or mud in raw water before supplying to the bearing, and before being supplied to the bearing provided at the lower part of the spindle. It is equipped with a filtered water pressurizing pump section that pressurizes the raw water after being supplied by the rotation of the spindle, and a discharge flow path that allows the raw water pressurized by the filtered water pressurizing pump section to be discharged from the inside of the casing to the outside of the casing. Therefore, when the spindle rotates, the raw water pressurized by the filtered water pressurizing pump unit can be pushed out from the discharge flow path.
Therefore, the vertical shaft pump of the present invention does not require an external pump and can be configured at low cost, and it is possible to supply raw water to the bearing and cool it even in a place where a water pipe is not arranged, and the bearing is made of earth and sand. It is possible to prevent damage.

It is a pipe and the whole sectional view which shows the 1st Embodiment of the vertical shaft pump which concerns on this invention. In the first embodiment, it is an enlarged sectional view which shows the main part. It is an enlarged sectional view of the main part which shows the 2nd Embodiment of the vertical shaft pump which concerns on this invention. 3A is a cross-sectional view taken along the line AA and FIG. 3B is a cross-sectional view taken along the line BB. In the second embodiment, it is a vertical sectional view which shows the filtered water pressurizing pump part. It is an enlarged sectional view of the main part which shows the 3rd Embodiment of the vertical shaft pump which concerns on this invention. It is an enlarged sectional view of the main part which shows the 4th Embodiment of the vertical shaft pump which concerns on this invention.

Hereinafter, the first embodiment of the vertical shaft pump in the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the vertical shaft pump 1 in the present embodiment can rotate the spindle 3 via a spindle 3 having an impeller 2 attached to the lower end and being rotationally driven, and a bearing (underwater bearing) 4. It is provided with a casing 5 having a water suction port 5a at an end for supporting and sucking raw water, and a raw water supply mechanism 6 for supplying raw water to a bearing 4.
The vertical shaft pump 1 of the present embodiment is a diagonal flow pump in which the flow discharged from the impeller 2 is in a conical surface about the center line of the main shaft 3.

The raw water supply mechanism 6 has a filter 7 for removing and filtering dust or mud in raw water before supplying to the bearing 4, and a filter 7 provided at the lower part of the spindle 3 before or after being supplied to the bearing 4. A filtered water pressurizing pump unit 8 that pressurizes raw water by rotation of a spindle 3 and a discharge flow path 9 capable of discharging raw water pressurized by the filtered water pressurizing pump unit 8 from the inside of the casing 5 to the outside of the casing 5 are provided. ing.

The filtered water pressurizing pump unit 8 has a spiral groove or a rotating fin provided on the outer peripheral surface of the main shaft 3.
In the present embodiment, as shown in FIG. 2, a filtered water pressurizing pump unit 8 having a spiral groove 8a, which is a screw pump, on the outer peripheral surface of the main shaft 3 is adopted.
That is, the filtered water pressurizing pump portion 8 of the present embodiment is a screw pump in which a deep groove is dug in the lower portion (shaft sleeve portion) of the spindle 3 or a spiral fin is provided to form a spiral groove 8a, and the spindle is formed. It functions as a screw pump that pushes raw water into the discharge flow path 9 by rotating with the rotation of 3.

The lower part of the spindle 3 is supported by a ceramic bearing 4 arranged below the filtered water pressurizing pump unit 8.
The raw water pressurized and increased by the filtered water pressurizing pump unit 8 is sent to the filtered water drainage space 9a below the filtered water pressurizing pump unit 8 via the ceramic bearing 4 below.
One end of the discharge flow path 9 is connected to the filtered water drainage space 9a, and the other end is connected to the outside of the casing 5. Therefore, the raw water sent into the filtered water drainage space 9a is discharged to the outside of the casing 5 via the discharge flow path 9.

The casing 5 includes a protective tube 5A in which a spindle 3 above the impeller 2 and a bearing 4 are arranged and protected inside, and an outer casing portion 5B in which the protective tube 5A is housed inside together with the spindle 3. There is.
The outer casing portion 5B is configured by connecting a plurality of tubular bodies in the axial direction.

The raw water supply mechanism 6 is piped so as to supply and inject the filtered raw water into the protective pipe 5A.
That is, a lead-out pipe 6a whose one end is connected to the upper part in the outer casing portion 5B and which guides the raw water discharged by the impeller 2 in the outer casing portion 5B to the outside, and a filter (strainer) connected to the other end of the take-out pipe 6a. ) 7, a filter 6b connected to the filter 7 to remove mud and the like in the filtered raw water, and a supply pipe 6c for supplying the raw water that has passed through the filter 6b to the upper part in the protective pipe 5A.
The filter 7 is a strainer that mainly removes large dust in raw water, and the filter 6b has a function of mainly removing fine particles such as mud in raw water.

A flow water detector 6d is connected in the middle of the supply pipe 6c.
Further, dust, mud, etc. in the filter 7 are discharged to the intake tank by the first discharge pipe 6e.
Further, one end of the air vent pipe 6g is connected to the outer casing portion 5B via the air valve 6f, and the other end of the air vent pipe 6g is connected to the intake tank.
In the figure, the flow of raw water is shown by the arrow line of the two-dot chain line.

The casing 5 has a cylindrical shape having a water suction port 5a which is a water suction port at the lower end, and a discharge pipe 10 is connected to the upper end side.
In the vertical shaft pump 1 of the present embodiment, the outdoor vertical shaft fully enclosed external fan motor M is installed at the upper part to rotationally drive the main shaft 3. By adopting the ground-based motor M in this way, reliability and life are improved as compared with the case where the submersible motor is installed directly above the impeller.

The protective pipe 5A has a structure that supports the underwater bearing 4 and receives vibration of the spindle 3 and the like, and is not connected to the outer casing portion 5B.
Further, the protective pipe 5A prevents turbidity between the drainage (raw water) in the casing 5 and the filtered raw water in the protective pipe 5A. The inside and outside of the protective tube 5A are blocked by a simple seal (labyrinth, grant packing, simple mechanical seal) or the like.
The impeller 2 is provided on the outer peripheral surface of the impeller 2a fixed to the lower part of the main shaft 3.
Above the impeller 2, guide blades 2b are provided inside the outer casing portion 5B.

In the vertical shaft pump 1 of the present embodiment, the discharge pipe 10 is installed in the pump base (base plate) 11b attached to the installation hole 11a formed in the installation floor 11 at the upper part of the suction water tank, and the flange portion at the upper part of the casing 5 is fixed. It is suspended and installed.

As described above, in the vertical shaft pump 1 of the present embodiment, the raw water supply mechanism 6 is provided in the filter 7 for removing and filtering the dust or mud in the raw water before being supplied to the bearing 4, and the bearing 4 provided at the lower part of the spindle 3. The filtered water pressurizing pump unit 8 that pressurizes the raw water before or after being supplied to the main shaft 3 by the rotation of the spindle 3, and the raw water pressurized by the filtered water pressurizing pump unit 8 from the inside of the casing 5 to the outside of the casing 5. Since the discharge flow path 9 is provided, the raw water pressurized by the filtered water pressurizing pump unit 8 can be pushed out from the discharge flow path when the spindle 3 rotates.

Therefore, the raw water for cooling supplied to the bearing 4 can be discharged to the outside of the casing 5 without installing an external pump. Further, since the raw water for cooling supplied to the bearing 4 is filtered by the filter 7, it is possible to prevent dust and mud from adhering to the bearing 4 and clogging the bearing 4, and the bearing is made of earth and sand. Can be prevented from being damaged.
Further, since the filtered water pressurizing pump unit 8 has a spiral groove or a rotating fin provided on the outer peripheral surface of the main shaft 3, when the main shaft 3 rotates, the spiral groove or the spiral groove of the filtered water pressurizing pump unit 8 or The rotating fins can also rotate to pressurize the surrounding raw water and push it out into the discharge flow path 9.

Further, the casing 5 is provided with a protective pipe 5A inside which the main shaft 3 above the impeller 2 and the bearing 4 are arranged and protected, and the raw water supply mechanism 6 supplies the filtered raw water into the protective pipe 5A. Therefore, the raw water supplied into the protective pipe 5A cools the bearing 4 and flows to the filtered water pressurizing pump unit 8 at the lower part of the spindle 3, so that it is not necessary to separately provide a raw water supply pipe for the bearing 4.

Next, the second to fourth embodiments of the vertical shaft pump according to the present invention will be described below with reference to FIGS. 3 to 6. In the following description of each embodiment, the same components described in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The difference between the second embodiment and the first embodiment is that in the first embodiment, the filtered water pressurizing pump unit 8 having the spiral groove 8a which is a screw pump on the main shaft 3 is adopted. As shown in FIGS. 3 to 5, the vertical shaft pump 21 of the second embodiment is provided at the lower part of the main shaft 3 and rotates together with the main shaft 3 to pressurize and send the raw water to the discharge flow path 29 in the main shaft 3. The point is that a water wheel type filtered water pressurizing pump unit 28 is adopted.

That is, in the second embodiment, the discharge flow path 29 is formed inside the main shaft 3 along the main shaft 3, and the filtered water pressurizing pump unit 28 is as shown in FIGS. 4A and 5A. It is provided with a plurality of raw water introduction flow paths 28b formed inside the main shaft 3 and having an opening (raw water introduction port 28a) at one end on the outer peripheral surface of the main shaft 3 and connecting the other end to the discharge flow path 29.
The plurality of raw water introduction flow paths 28b are opened at the raw water introduction port 28a by tilting the axis in the rotation direction of the main shaft 3.

That is, the raw water introduction flow path 28b extends outward in the radial direction from the discharge flow path 29 formed on the central axis of the main shaft 3, and then the flow path tilts and extends in the direction of rotation of the main shaft 3 on the way. At the raw water introduction port 28a, the axis of the raw water introduction flow path 28b is tilted in the rotational direction.
The discharge flow path 29 has a casing in which a plurality of raw water introduction flow paths 28b are connected to each other and a main shaft inner flow path 29a provided in the main shaft 3 and a main shaft inner flow path 29a coaxially arranged at the lower end of the main shaft 3 are connected. A discharge pipe 29b fixed via a support plate 5 g is provided at the lower portion of the 5.

Further, although the lower end of the main shaft 3 is inserted inward in the upper part of the discharge pipe 29b, a gap is provided between the main shaft 3 and the main shaft 3 so that the rotating main shaft 3 does not slide.
Further, the discharge flow path 29 is arranged in the water suction port 5a and has a plurality of discharge ports 27c in the circumferential direction at the lower end portion, which discharge the raw water in the clockwise direction with respect to the central axis of the water absorption port 5a. The swirling flow generating unit 27 is provided.
As shown in FIG. 4B, the swirling flow generating portion 27 includes an upper cylinder portion 27a connected to the lower end of the discharge pipe 29b and a lower cylinder portion 27b provided below the upper cylinder portion 27a. ing.

The lower cylinder portion 27b has an inner diameter that gradually expands downward, and is formed by dividing a plurality of discharge ports 27c on the outer peripheral portion of the lower surface by a plurality of swirling diversion blades 27e provided inside.
The plurality of swirling diversion blades 27e extend outward from the central upper cylinder portion 27a while bending clockwise, and the plurality of swirling diversion blades 27e discharge the raw water discharged from the discharge pipe 29b. By guiding, raw water can be discharged from a plurality of discharge ports 27c in a clockwise direction when viewed from above.

As described above, in the vertical shaft pump 21 of the second embodiment, since the plurality of raw water introduction flow paths 28b are opened by tilting the axis in the rotation direction of the main shaft 3, when the main shaft 3 rotates, the plurality of raw water introduction flow paths 28b are opened. As the surrounding raw water enters, it is pressurized and guided to the discharge flow path 29.
The larger the outer diameter of the filtered water pressurizing pump unit 28, the more the amount of water discharged from below can be increased.

Further, the discharge flow path 29 is arranged in the water absorption port 5a, and has a plurality of discharge ports 27c in the circumferential direction at the lower end portion to discharge the raw water in the clockwise direction with respect to the central axis of the water absorption port 5a. Since the swirling flow generating unit 27 is provided, the clockwise swirling flow generated below the water absorption port 5a by the swirling flow generating unit 27 cancels out the counterclockwise swirling flow that tends to occur during water absorption to generate a vortex. Can be suppressed.

Next, the difference between the third embodiment and the second embodiment is that in the second embodiment, the swirling flow generating portion 27 is attached to the lower end of the discharge pipe 29b, whereas the vertical axis of the third embodiment is attached. As shown in FIG. 6, the pump 31 has a discharge flow path 39 inside, protrudes downward from the water absorption port 5a, and has a lower ejection pipe 39a that discharges raw water downward.

That is, in the third embodiment, the lower ejection pipe 39a is connected to the lower end of the main shaft 3 instead of the discharge pipe 29b, protrudes downward from the water suction port 5a, and extends to the vicinity of the earth and sand S at the bottom of the water suction tank.
The distance from the bottom to the water suction port 5a is formed to be the same as the inner diameter D of the water suction port 5a, and the distance from the lower end of the lower ejection pipe 39a to the bottom is set to about 0.5D.
The ejection pipe 39a is coaxially arranged at the lower end of the main shaft 3 to be connected to a flow path 29a in the main shaft, and is fixed to the lower part in the casing 5 via a support plate 5g.
Further, although the lower end of the main shaft 3 is inserted inward in the upper part of the ejection pipe 39a, a gap is provided between the main shaft 3 and the main shaft 3 so that the rotating main shaft 3 does not slide.

As described above, the vertical shaft pump 31 of the third embodiment has a discharge flow path 39 inside, and also has a lower jet pipe 39a that protrudes downward from the water absorption port 5a and discharges raw water downward. The earth and sand S that tends to accumulate below the center of the water suction port 5a is agitated and blown off by the raw water jetted downward from the lower ejection pipe 39a as a jet jet, so that stable drainage can be continued.

Next, the difference between the fourth embodiment and the third embodiment is that in the third embodiment, the raw water pressurized by the filtered water pressurizing pump unit 28 is supplied to the lower ejection pipe 39a and ejected downward. On the other hand, in the vertical shaft pump 41 of the fourth embodiment, as shown in FIG. 7, a downward ejection is performed separately from the filtered water pressurizing pump unit 8 that pressurizes and supplies the raw water for circulation (cooling) of the bearing 4. A point is that a pump portion 48 for ejecting raw water to be ejected downward from the pipe 39a is provided.

That is, in the vertical shaft pump 41 of the fourth embodiment, the filter 5c provided in the casing 5 to remove dust or mud from a part of the raw water sucked up in the casing 5 and the raw water passing through the filter 5c are discharged downward pipe 39a. It is provided with a jet flow path 5e sent to the casing 5 and a jet pump unit 48 that pressurizes a part of the raw water sucked up in the casing 5 and supplies it to the lower jet pipe 39a.

In the fourth embodiment, the same screw pump type filtered water pressurizing pump section 8 as in the first embodiment is provided at the lower part of the main shaft 3, but the ejection pump section is further below the filtered water pressurizing pump section 8. 48 is provided on the spindle 3.
The raw water pressurized by the filtered water pressurizing pump unit 8 is discharged from the side to the outside of the casing 5 via the drainage flow path 9, as in the first embodiment.

The ejection pump unit 48 has a water wheel type pump structure similar to that of the filtered water pressurizing pump unit 28 of the second embodiment.
A part of the raw water sucked up in the outer casing portion 5B is ejected from the inner space 5f formed inside the flow hole 5b via the flow hole 5b provided in the inner wall 5d inside the guide blade 2b. It is supplied into the boss inner space 48a which is the outer periphery of the 48 and is provided in the imperabos 2a.
The inner space 5f and the boss inner space 48a communicate with each other. Further, the flow path 29a in the main shaft and the lower ejection pipe 39a communicate with each other.

The raw water in the boss inner space 48a is pressurized by the ejection pump unit 48 via the raw water introduction flow path 28b and the main shaft inner flow path 29a, and is sent to the lower ejection pipe 39a.
That is, the flow hole 5b, the inner space 5f, the boss inner space 48a, the raw water introduction flow path 28b, and the main shaft inner flow path 29a constitute the jet flow path 5e.
The filter 5c is a mesh plate fitted in the flow hole 5b.

As described above, in the vertical shaft pump 41 of the fourth embodiment, since the jet pump unit 48 is provided separately from the filtered water pressurizing pump unit 8, water absorption is performed regardless of the amount of raw water supplied for bearing cooling. By directly using a part of the raw water sucked up from the mouth 5a for jet jet and pressurizing it by the ejection pump unit 48, a large amount of raw water can be ejected from the lower ejection pipe 39a for stirring and blowing off the earth and sand S. ..
By changing the lower part of the lower ejection pipe 39a to the swirling flow generating section 27, the clockwise swirling flow generated below cancels the counterclockwise swirling flow that tends to occur during water absorption and suppresses the generation of vortices. You can also do it. Further, as the outer diameter of the ejection pump portion 48 is increased, the amount of water discharged from below can be increased.

Further, a filter 5c provided in the casing 5 for removing dust or mud from a part of the raw water sucked up in the casing 5 and a jet flow path 5e for sending the raw water passing through the filter 5c to the lower ejection pipe 39a are provided. Therefore, by discharging the raw water from which dust and the like have been removed by the filter 5c from the lower ejection pipe 39a to the lower side of the water suction port 5a, it is not necessary to return the dust and the like to the water absorption tank and the like, and the jet flow path 5e is clogged. Can be prevented.

The present invention is not limited to each of the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, the vertical shaft pump of the first embodiment is provided with a filtered water pressurizing pump portion having a spiral groove in the lower part of the spindle, but a filtered water pressurizing pump portion having a rotating fin in the lower part of the spindle may be used. .. That is, by providing a plurality of rotary fins at the lower part of the spindle, the rotary fins are also rotated when the spindle is rotationally driven, and the raw water supplied to the lower part of the spindle is pushed out to the discharge flow path by the rotating rotary fins. It doesn't matter.

1,21,31,41 ... Vertical pump, 2 ... Impeller, 2b ... Guide blade, 3 ... Main shaft, 4 ... Bearing, 5 ... Casing, 5a ... Water inlet, 5A ... Protective pipe, 5B ... Outer casing part, 6 ... Raw water supply mechanism, 7 ... Filter, 8 ... Filtered water pressurizing pump unit, 8a ... Spiral groove, 9 ... Discharge flow path, 10 ... Discharge pipe, 27 ... Swirling flow generator, 27c ... Discharge port, 28a ... Raw water introduction port, 28b ... Raw water introduction channel, 39a ... Downward ejection pipe

Claims (6)

A spindle with an impeller attached to the lower end and driven to rotate,
A casing having a water suction port at the end that rotatably supports the spindle via a bearing and sucks up raw water.
The bearing is provided with a raw water supply mechanism for supplying the raw water.
A filter that removes dust or mud from the raw water and filters the raw water before the raw water supply mechanism supplies the bearing to the bearing.
A filtered water pressurizing pump unit provided at the lower part of the spindle and pressurizing the raw water before or after being supplied to the bearing by rotation of the spindle.
A vertical shaft pump comprising a discharge flow path capable of discharging the raw water pressurized by the filtered water pressurizing pump portion from the inside of the casing to the outside of the casing. In the vertical shaft pump according to claim 1,
A vertical shaft pump characterized in that the filtered water pressurizing pump portion has a spiral groove or a rotating fin provided on an outer peripheral surface of the main shaft. In the vertical shaft pump according to claim 1,
The discharge flow path is formed inside the spindle along the spindle, and is formed.
The filtered water pressurizing pump portion is formed inside the main shaft and has a plurality of raw water introduction flow paths having one end open on the outer peripheral surface of the main shaft and the other end connected to the discharge flow path.
A vertical shaft pump characterized in that the plurality of raw water introduction flow paths are opened by tilting an axis in the rotation direction of the main shaft. In the vertical shaft pump according to any one of claims 1 to 3.
The casing has a protective tube inside which the spindle above the impeller and the bearing are arranged and protected inside.
It is provided with an outer casing portion in which the protective tube is housed inside together with the main shaft.
A vertical shaft pump characterized in that the raw water supply mechanism supplies the filtered raw water into the protective tube. In the vertical shaft pump according to any one of claims 1 to 4.
A swirling flow in which the discharge flow path is arranged in the water suction port and has a plurality of discharge ports in the circumferential direction at the lower end portion to discharge the raw water in the clockwise direction with respect to the central axis of the water suction port. A vertical shaft pump characterized by having a generator. In the vertical shaft pump according to any one of claims 1 to 5.
A vertical shaft pump having the discharge flow path inside, projecting downward from the water suction port, and having a downward ejection pipe for discharging the raw water downward.

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