JP2020159261A - Pump comprising foreign substance removal device - Google Patents

Abstract

To provide a pump that can prevent a foreign substance from being entangled with a pump operation assisting device, thereby allowing stable pump operation and improving maintainability.SOLUTION: A pump comprises a main shaft 32 extending in a vertical direction, an impeller 31 fixed to the main shaft 32, a flow passage structure 53 in which the main shaft 32 and the impeller 31 are arranged, a pump operation assisting device 51 arranged outside the flow passage structure 53, and a foreign substance removal device 55 constituted rotatably with respect to the pump operation assisting device 51. The flow passage structure 53 comprises a pump casing 27 internally housing the impeller 31. The foreign substance removal device 55 is arranged so as to surround a portion of the pump operation assisting device 51.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pump used for pumping water in a suction water tank, and more particularly to a pump provided with a foreign matter removing device.

A river drainage pump station where a pump facility for draining river water is installed is often installed at the confluence of the inland river and the main river, and as a result, foreign matter such as dust in the inland river is drained. It may flow into the airport. Similarly, since the sewage rainwater drainage pump station is installed at the end of the drainage channel such as the rainwater trunk line, foreign matter in the drainage channel may flow into the drainage pump station. Generally, a screen as a dust removing device is installed on the upstream side of the pump so that such foreign matter does not interfere with the operation of the pump.

JP-A-2002-1558998

However, some foreign matter may pass through the screen and reach the pump. If a vortex suppression device for suppressing harmful air suction vortices or underwater vortices generated in the suction water tank of the pump equipment is installed in the suction water tank, foreign matter that has passed through the screen may get entangled with the vortex suppression device. .. As a result, the vortex suppression effect cannot be sufficiently obtained, the drainage performance of the pump may be deteriorated, and the pump operation may be unstable.

Further, even in the preceding standby type pump, foreign matter that has passed through the screen may be entangled with the air inflow pipe provided in the suction water tank, hindering the smooth flow of liquid and deteriorating the drainage performance of the pump.

Further, since the vortex suppression device and the air inflow pipe are installed in the suction water tank, it is difficult to clean them to remove foreign substances, and there is a problem in maintenance.

The present invention has been made in view of the above-mentioned conventional problems, and by preventing foreign matter from being entangled with the pump operation assisting device, stable pump operation can be enabled and maintenance can be improved. The purpose is to provide a pump.

In one aspect, in a pump that pumps liquid in a suction water tank, a main shaft, an impeller fixed to the main shaft, a flow path structure in which the main shaft and the impeller are arranged inside, and the flow path structure. The pump casing is provided with a pump operation assisting device arranged outside the pump operation assisting device and a foreign matter removing device rotatably configured with respect to the pump operating assisting device, and the flow path structure internally accommodates the impeller. The pump is provided, wherein the foreign body removing device is arranged so as to surround a part of the pump operation assisting device.

In one aspect, the foreign body removal device comprises a tubular body rotatably attached to a portion of the pump operation assist device.
In one aspect, the foreign body removing device further comprises a plurality of protrusions fixed to the outer peripheral surface of the cylinder.
In one aspect, the tubular body is rotatable about its axis, and the plurality of protrusions are staggered along the axis.
In one aspect, the outer peripheral surface of the cylinder has a polygonal cross section with rounded vertices.
In one aspect, the outer peripheral surface of the cylinder has an elliptical cross section.
In one aspect, the foreign matter removing device includes a support rod connected to a part of the pump operation assisting device and an arch member connected to the support rod, and the arch-shaped member is centered on the support rod. It is configured to be rotatable.
In one aspect, the pump operation assisting device uses a vertical bar fixed to the flow path structure and the vertical bar in the flow path in a state where a gap exists between the flow path structure and the outer peripheral surface of the flow path structure. A vertical bar bracket connected to the structure is provided, the vertical bar is arranged on the downstream side of the main shaft with respect to the flow direction of the liquid, and the foreign matter removing device includes the vertical bar bracket and the vertical bar. It is attached to at least one of them.
In one aspect, the pump operation assisting device connects a semi-cylindrical body fixed to the pump casing and the semi-cylindrical body to the pump casing in a state where a gap is present between the pump operation assisting device and the outer peripheral surface of the pump casing. The semi-cylindrical body is provided on the downstream side of the main shaft with respect to the flow direction of the liquid, and the semi-cylindrical body has an inner peripheral surface extending in parallel with the main shaft. The foreign matter removing device is attached to the semi-cylindrical bracket.
In one aspect, the pump operation assisting device connects a semi-cylindrical body fixed to the pump casing and the semi-cylindrical body to the pump casing in a state where a gap is present between the pump operation assisting device and the outer peripheral surface of the pump casing. With a gap between the semi-cylindrical bracket and the outer peripheral surface of the pump casing, the arc member fixed to the pump casing and the arc member bracket connecting the arc member to the pump casing. The semi-cylindrical body is arranged on the downstream side of the main shaft with respect to the flow direction of the liquid, and the semi-cylindrical body has an inner peripheral surface extending in parallel with the main shaft, and the arc The member is curved along the circumferential direction of the outer peripheral surface of the pump casing, the arc member is arranged above the semi-cylindrical body, and the foreign matter removing device is a bracket for the semi-cylindrical body. It is attached to the bracket for the arc member and at least one of the arc members.
In one aspect, the pump operation assist device includes an air inflow pipe that communicates with the inside of the pump casing below the impeller, and the foreign matter removing device is attached to the air inflow pipe.
In one aspect, the pump operation assisting device includes an air inflow pipe that communicates with the inside of the pump casing below the impeller and an air inflow pipe bracket that connects the air inflow pipe to the flow path structure. , The foreign matter removing device is attached to at least one of the air inflow pipe bracket and the air inflow pipe.
In one aspect, the pump casing comprises a suction bell mouth having a suction port that opens downward, and the pump operation assisting device includes an underwater vortex suppressing plate that projects downward from the suction bell mouth, and the foreign matter. The removing device is attached to the underwater vortex suppressing plate.

Since the foreign matter removing device is configured to be rotatable with respect to a pump operation assisting device such as a vortex suppressing device and an air inflow pipe, the foreign matter removing device rotates to remove foreign matter adhering to the foreign matter removing device. Can be done. As a result, it is possible to prevent foreign matter from getting entangled with the pump operation assisting device and enable stable pump operation. In addition, it is possible to reduce the burden of cleaning for removing foreign substances and improve maintainability.

It is a schematic diagram which shows one Embodiment of the pump provided with the foreign matter removing device. It is a figure which shows the Karman vortex generated on the downstream side of a pumping pipe. It is a figure which shows the example of each dimension associated with a pump diameter. FIG. 3 is a top view of the pump and the suction water tank shown in FIG. It is a side view which shows the pump operation assist device. FIG. 5 is a cross-sectional view taken along the line AA of FIG. It is a figure which shows the flow of the liquid which was separated by a pump casing or a pumping pipe. It is a figure which shows the flow from Karman vortex to the suction port. 9 (a) and 9 (b) are schematic views showing a modified example of the cross-sectional shape of the semi-cylindrical body. It is a schematic diagram which shows one of a plurality of foreign matter removing devices. FIG. 10 is a cross-sectional view taken along the line BB of FIG. FIG. 12A is a schematic view showing a state in which the foreign matter is attached to the foreign matter removing device, and FIG. 12B is a schematic diagram showing a state in which the foreign matter has slipped off the foreign matter removing device. It is a schematic diagram which shows the other embodiment of the foreign matter removing apparatus. It is a schematic diagram which shows the other embodiment of the foreign matter removing apparatus. It is a schematic diagram which shows the other embodiment of the foreign matter removing apparatus. It is a schematic diagram which shows the other embodiment of the foreign matter removing apparatus. FIG. 16 is a sectional view taken along line CC of FIG. It is a figure which looked at the plurality of underwater vortex suppression plates shown in FIG. 1 from the bottom. FIG. 8 is a sectional view taken along line DD of FIG. It is a side view which shows the other embodiment of a pump. 20 is a cross-sectional view taken along the line EE of FIG. It is a top view which shows still another embodiment of a pump. It is a schematic diagram which shows still another embodiment of a pump.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Although the embodiments described below relate to vertical shaft pumps, the present invention is not limited to these embodiments, and can be used for horizontal shaft pumps as well. Further, the present invention can also be used for a column pipe type submersible pump. FIG. 1 is a schematic view showing an embodiment of a pump provided with a foreign matter removing device. As shown in FIG. 1, the pump 20 includes a main shaft 32 extending in the vertical direction, an impeller 31 fixed to the main shaft 32, and a flow path structure 53 in which the main shaft 32 and the impeller 31 are arranged therein. ing.

The flow path structure 53 includes a pump casing 27 that houses the impeller 31 inside, a pumping pipe 28 connected to the upper end of the pump casing 27, and a hanging pipe 33 connected to the upper end of the pumping pipe 28. It is provided with a discharge curved pipe 30 connected to the upper end of the lowering pipe 33. The pump casing 27 is suspended in the suction water tank 1 by a pumping pipe 28. The pump casing 27 includes a suction bell mouth 22, an impeller casing 21, and a discharge bowl 24. The upper end of the discharge bowl 24 is connected to the lower end of the pumping pipe 28. The suction bell mouth 22 has a suction port 22a that opens downward. The upper end of the suction bell mouth 22 is connected to the lower end of the impeller casing 21. The impeller 31 is housed in the impeller casing 21 and the discharge bowl 24.

The pumping pipe 28 extends downward through a pump opening 5 formed in the pump installation floor 2 constituting the upper wall of the suction water tank 1. The suspension pipe 33 is fixed to the pump base 35 installed on the pump installation floor 2. The pumping pipe 28 is fixed to the pump installation floor 2 via the hanging pipe 33 and the pump base 35. The main shaft 32 extends vertically through the discharge curved pipe 30, the pumping pipe 28, and the pump casing 27, and the lower end thereof is located in the pump casing 27.

The spindle 32 is rotatably supported by an outer bearing 45 and an underwater bearing 41. The outer bearing 45 is fixed to the upper part of the discharge curved pipe 30 and supports the upper part of the spindle 32. The submersible bearing 41 is housed in the discharge bowl 24 and supports the lower part of the spindle 32. An inner bowl 25 is arranged inside the discharge bowl 24, and the inner bowl 25 is connected to the discharge bowl 24 by a plurality of guide vanes 37. The submersible bearing 41 is fixed to the inner peripheral surface of the inner bowl 25 via the support member 41a.

The main shaft 32 projects upward from the discharge curved pipe 30 and is connected to a prime mover (for example, a motor) (not shown). The spindle 32 and the impeller 31 are configured to rotate by this prime mover. The plurality of guide vanes 37 are arranged above the impeller 31 (discharge side). A liquid flow path is formed between the inner peripheral surface of the discharge bowl 24 and the outer peripheral surface of the inner bowl 25. When the impeller 31 rotates, the liquid (for example, water) in the suction water tank 1 is sucked from the suction port 22a of the suction bell mouth 22. The liquid is transferred to a discharge pipe (not shown) through the discharge bowl 24, the pumping pipe 28, the suspension pipe 33, and the discharge curved pipe 30 by the rotation of the impeller 31. In this way, the liquid in the suction water tank 1 is pumped up by the pump 20.

As the water level of the suction water tank 1 (the height of the liquid level in the suction water tank 1) decreases, a vortex may be generated on the free surface of the liquid in the suction water tank 1. When the vortex is drawn into the pump 20, it becomes an air suction vortex, and air enters the inside of the pump 20. In particular, the continuous vortex that continuously extends from the water surface (liquid level) to the suction port 22a is a harmful air suction vortex that causes abnormal vibration of the pump 20. If such a harmful air suction vortex is generated, the pump 20 may break down. Further, as the pumping capacity of the pump 20 is improved, the flow velocity of the liquid in the suction water tank 1 becomes higher, and as a result, an underwater vortex is likely to be generated from the bottom surface of the suction water tank 1. Therefore, the pump 20 of the present embodiment further includes a pump operation assisting device 51 as a vortex suppressing device.

The pump operation assisting device 51 is arranged outside the flow path structure 53. Therefore, the pump 20 is further provided with a plurality of foreign matter removing devices 55 for preventing foreign matter such as dust in the suction water tank 1 from being entangled with the pump operation assisting device 51. The plurality of foreign matter removing devices 55 are attached to a part of the pump operation assisting device 51.

The pump operation assisting device 51 has a plurality of vertical bars 61 and a plurality of vertical ribs 62 as a first air suction vortex suppressing device for suppressing the generation of an air suction vortex, and a plurality of vertical bars 61 in the flow path structure 53. A plurality of vertical bar brackets 65 to be connected, a semi-cylindrical body 71 as a second air suction vortex suppressing device, a plurality of semi-cylindrical body brackets 75 connecting the semi-cylindrical body 71 to the pump casing 27, and an underwater vortex. It is provided with a plurality of underwater vortex suppressing plates 49 as an underwater vortex suppressing device. The underwater vortex suppression plate 49 is a flat plate-shaped member. In FIG. 1, one of each of a plurality of vertical bars 61, a plurality of vertical ribs 62, and a plurality of semi-cylindrical brackets 75 is illustrated.

More specifically, the plurality of vertical bars 61, the plurality of vertical ribs 62, and the semi-cylindrical body 71 are arranged outside the pump casing 27. When viewed from the axial direction of the spindle 32, the plurality of vertical bars 61, the plurality of vertical ribs 62, and the semi-cylindrical body 71 are located inside the pump opening 5. Therefore, when performing maintenance or repair of the pump 20, the entire pump 20 can be pulled up through the pump opening 5. The plurality of vertical bars 61, the plurality of vertical ribs 62, and the semi-cylindrical body 71 are arranged on the downstream side of the main shaft 32 with respect to the flow direction of the liquid in the suction water tank 1.

The vertical bar 61 generally has a circular cross-sectional shape and extends in the axial direction of the main shaft 32. Each vertical bar 61 is fixed to the flow path structure 53 in a state where a gap exists between the vertical bar 61 and the outer peripheral surface of the flow path structure 53. More specifically, each vertical bar 61 is connected to the outer peripheral surface of the pump casing 27 by a plurality of vertical bar brackets 65. In one embodiment, the vertical bar 61 may be fixed to the pumping pipe 28 or the hanging pipe 33.

Each vertical bar 61 extends along the main shaft 32 as a whole. Similarly, each vertical rib 62 extends along the spindle 32 as a whole. The vertical bar 61 and the vertical rib 62 extend in the vertical direction as a whole. In the present embodiment, the vertical bar 61 has a linear shape extending in parallel with the main shaft 32, but the shape of the vertical bar 61 is not limited to this embodiment. In one embodiment, a part of the vertical bar 61 may be curved.

The vertical rib 62 is fixed to the outer peripheral surface of the flow path structure 53. In the present embodiment, the vertical rib 62 has a shape curved along the outer peripheral surface of the pump casing 27 and extends in the axial direction of the main shaft 32. More specifically, the vertical rib 62 is fixed to the outer peripheral surface of the pump casing 27, and projects outward from the outer peripheral surface of the pump casing 27 in the radial direction. In one embodiment, the upper portion of the vertical rib 62 may be fixed to the outer peripheral surface of the pumping pipe 28. Further in one embodiment, the longitudinal rib 62 may be integrally formed with the pump casing 27 and / or the pumping pipe 28.

The semi-cylindrical body 71 as the second air suction vortex suppressing device is arranged below the vertical rod 61 and the vertical rib 62. The semi-cylindrical body 71 is fixed to the pump casing 27 with a gap between the semi-cylindrical body 71 and the outer peripheral surface of the pump casing 27. More specifically, the semi-cylindrical body 71 is fixed to the suction bell mouth 22 by a plurality of brackets 75. In one embodiment, the semi-cylindrical body 71 may be fixed to the discharge bowl 24. The semi-cylindrical body 71 has an inner peripheral surface 71a extending in parallel with the main shaft 32.

As shown in FIG. 2, the air suction vortex is generated by the development of the Karman vortex 7 generated when the flow of the liquid forming the free surface is divided by the pumping pipe 28 or the discharge bowl 24. Therefore, the Karman vortex 7 is generated on the downstream side of the pumping pipe 28 or the discharge bowl 24. Further, the Karman vortex 7 is flowed to the downstream side by the flow of the liquid. Therefore, the vertical bar 61, the vertical rib 62, and the semi-cylindrical body 71 are arranged on the downstream side of the main shaft 32.

FIG. 3 is a diagram showing an example of each dimension associated with the pump diameter, and FIG. 4 is a view of the pump 20 and the suction water tank 1 shown in FIG. 3 as viewed from above. As shown in FIG. 3, assuming that the pump diameter (the diameter on the discharge side of the pump casing 27 in this embodiment) is d, from the lower end of the suction bell mouth 22 (that is, the lower end of the pump casing 27) to the bottom surface of the suction water tank 1. The distance of is generally 0.5d or more, and is in the range of 0.75d to 1.0d as an example. The distance from the center of the pump 20 (the axis O of the main shaft 32) to the rear wall of the suction water tank 1 is 1.5 d or less. The diameter of the pump opening 5 is a value generally determined by the pump diameter d, but is in the range of 1.6d to 2.1d in one embodiment. As shown in FIG. 4, the water channel width of the suction water tank 1 is about 3.0 d. When designed with these dimensions, the minimum water level LWL of the suction water tank 1 in which the pump 20 can be operated can be lowered by about 0.5d to 0.9d as compared with the conventional pump.

As described above, as the water level of the suction water tank 1 (the height of the liquid level in the suction water tank 1) decreases, Karman vortices 7 (see FIG. 2) are generated on the free surface of the liquid in the suction water tank 1. Sometimes. In order to suppress the generation of the Karman vortex 7, the upper end of the vertical bar 61 needs to be located above the water level of the suction water tank 1 when the Karman vortex 7 is generated. When the water channel width of the suction water tank 1 is about 3.0 d and the distance from the center of the pump 20 (the axial center O of the main shaft 32) to the rear wall of the suction water tank 1 is 1.5 d or less, the minimum water level of the conventional pump Is generally a water level of 2.5d or higher. At a water level higher than the minimum water level of this conventional pump, the Karman vortex 7 is generally not generated, but the Karman vortex 7 may be generated depending on the shape of the suction water tank 1.

According to the example of each dimension shown in FIG. 3, since the pump 20 of the present embodiment operates at a water level lower than the minimum water level of the conventional pump, the upper end of the vertical bar 61 is positioned below the minimum water level of the conventional pump. Become. This is to suppress the generation of Karman vortex 7 when the water level of the suction water tank 1 drops after the start of operation of the pump 20. According to FIG. 3, the distance from the lower end of the suction bell mouth 22 to the bottom surface of the suction water tank 1 is within the range of 0.75d to 1.0d, so that the upper end of the vertical bar 61 is the lower end of the suction bell mouth 22. It is located within the range of 0.8d or more and below the operation start water level. According to the example of each dimension shown in FIG. 3, the upper end of the vertical bar 61 is located within the range of 0.8d to 1.75d from the lower end of the suction bell mouth 22. The lower end of the vertical bar 61 is located below the upper end of the impeller 31.

FIG. 5 is a side view showing the pump operation assisting device 51, and FIG. 6 is a cross-sectional view taken along the line AA of FIG. In FIG. 5, the illustration of the plurality of underwater vortex suppression plates 49 is omitted. In the present embodiment, two vertical bars 61 and two vertical ribs 62 are provided, but the number of vertical bars 61 and vertical ribs 62 is not limited to this embodiment.

As shown in FIG. 6, the two vertical bars 61 are arranged adjacent to each of the two vertical ribs 62. Each vertical bar 61 is located at a position farther from the axis O of the main shaft 32 than the adjacent vertical rib 62. That is, the distance between the axis O of the spindle 32 and the vertical bar 61 is longer than the distance between the axis O of the spindle 32 and the vertical rib 62. Similar to the vertical bar 61, the upper end of the vertical rib 62 needs to be located above the water level of the suction water tank 1 when the Karman vortex 7 is generated. In the embodiment shown in FIG. 5, the vertical rib 62 is shorter than the vertical bar 61, but in one embodiment, the vertical rib 62 may have the same length as the vertical bar 61 or may be longer than the vertical bar 61. ..

As shown in FIG. 6, the two vertical bars 61 are located on the downstream side of the main shaft 32 with respect to the flow direction of the liquid in the suction water tank 1 (see FIG. 1), and the liquid passing through the axis O of the main shaft 32 They are arranged symmetrically with respect to the straight line RL parallel to the flow direction. Similarly, the two vertical ribs 62 are located downstream of the spindle 32 with respect to the flow direction of the liquid and are arranged symmetrically with respect to a straight line RL parallel to the flow direction of the liquid passing through the axis O of the spindle 32. .. In the present embodiment, the two vertical rods 61 and the two vertical ribs 62 are arranged on the outer peripheral surface of the pump casing 27 on the downstream side of the separation point of the liquid flow.

When the water level of the suction water tank 1 is high, the flow velocity of the liquid in the suction water tank 1 is low, and when the water level of the suction water tank 1 is low, the flow velocity of the liquid in the suction water tank 1 is high. The location where the Karman vortex 7 (see FIG. 2) is generated changes depending on the water level of the suction water tank 1 and the flow velocity of the liquid in the suction water tank 1 when the liquid in the suction water tank 1 is pumped up. The Karman vortex 7 is likely to be generated near the outer peripheral surface of the pump casing 27 or the pumping pipe 28 when the flow velocity of the liquid in the suction water tank 1 is low.

FIG. 7 is a diagram showing the flow of the liquid separated by the pump casing 27 or the pumping pipe 28. In FIG. 7, the illustration of the plurality of foreign matter removing devices 55 is omitted. As shown by the arrow in FIG. 7, the liquid in the vicinity of the outer peripheral surface of the pump casing 27 or the pumping pipe 28 divided by the pump casing 27 or the pumping pipe 28 is disturbed by colliding with the vertical rib 62. As a result, the vertical rib 62 can suppress the generation of Karman vortices 7 near the outer peripheral surface of the pump casing 27 or the pumping pipe 28.

The vertical rib 62 can effectively suppress the generation of an air suction vortex when the water level of the suction water tank 1 is high (when the flow velocity of the liquid in the suction water tank 1 is low). As an example, the vertical rib 62 has a height (length in the radial direction of the pump casing 27) of about 0.1d and a width (length in the circumferential direction of the pump casing 27) of about 0.1d. At some point, the generation of Karman vortices 7 can be effectively suppressed.

The liquid that collides with the vertical rib 62 and disturbs its flow may flow to the outside of the pump casing 27 and generate a Karman vortex 7 at a position away from the pump casing 27. Further, it is known that when the water level of the suction water tank 1 is relatively low (when the flow velocity of the liquid in the suction water tank 1 is high), the Karman vortex 7 is likely to be generated at a position away from the pump casing 27. Therefore, in order to suppress the generation of such Karman vortices 7, in the present embodiment, the vertical bars 61 are arranged outside the vertical ribs 62 in the radial direction. As shown by the arrow in FIG. 7, a part of the liquid that collided with the vertical rib 62 and flowed to the outside of the pump casing 27 and a part of the liquid that was separated by the pump casing 27 or the pumping pipe 28 collided with the vertical rod 61. However, the flow is disturbed because it flows between the vertical bar 61 and the vertical rib 62 or around the vertical bar 61. As a result, the vertical bar 61 can suppress the generation of Karman vortices 7 at a position away from the pump casing 27.

The vertical rod 61 has a high flow velocity of the liquid in the suction water tank 1 when the water level of the suction water tank 1 is further lowered from the water level range of the suction water tank 1 in which the vertical rib 62 can suppress the generation of the air suction vortex. When), the generation of air suction vortices can be effectively suppressed. Further, the Karman vortex 7 generated by the water that collides with the vertical rib 62 and flows to the outside of the pump casing 27 is generated on the downstream side of the vertical rib 62. Therefore, the vertical bar 61 is arranged on the downstream side (see FIG. 6) of the extension line of the line connecting the axial center O of the main shaft 32 and the vertical rib 62. In one embodiment, the vertical bar 61 may be arranged on the extension line.

As shown in FIG. 6, the angle θ0 formed by the two lines connecting the axis O of the spindle 32 and the two vertical ribs 62 is the two lines connecting the axis O of the spindle 32 and the two vertical bars 61. The angle formed is greater than or equal to θ1 (θ0 ≧ θ1). In this embodiment, the angle θ0 is larger than the angle θ1. When the values of θ0 and θ1 are about 30 ° to 120 °, the combination of the vertical rib 62 and the vertical bar 61 can effectively suppress the generation of the Karman vortex 7.

In one embodiment, the cross-sectional shape of the vertical bar 61 may be a polygon such as a quadrangle or an L-shape. The vertical rib 62 of each of the above-described embodiments has a quadrangular cross-sectional shape, but the cross-sectional shape of the vertical rib 62 is not limited to this shape. In one embodiment, the cross-sectional shape of the vertical rib 62 may be triangular or circular.

The combination of the plurality of vertical bars 61 and the plurality of vertical ribs 62 constituting the first air suction vortex suppressing device in each of the above-described embodiments causes the Karman vortex 7 to be generated at a wide water level and a wide flow velocity of the suction water tank 1. It can be suppressed and the generation of air suction vortices can be suppressed.

As shown in FIGS. 5 and 6, the semi-cylindrical body 71 is arranged so as to surround a part of the outer peripheral surface of the pump casing 27, but the configuration of the semi-cylindrical body 71 is not limited to this embodiment. For example, the semi-cylindrical body 71 may be arranged so that its lower end is located below the lower end of the suction bell mouth 22, and its lower end is located at the same height as the lower end of the suction bell mouth 22. May be done.

When the Karman vortex 7 is generated, when the liquid in the suction water tank 1 is pumped up, a strong downward flow from the Karman vortex 7 to the suction port 22a is generated and develops into an air suction vortex. FIG. 8 is a diagram showing a flow from the Karman vortex 7 toward the suction port 22a. In FIG. 8, the vertical bar 61, the vertical bar bracket 65, the vertical rib 62, the foreign matter removing device 55, and the plurality of underwater vortex suppressing plates 49 are not shown. As shown in FIG. 8, the downward flow F1 from the Karman vortex 7 toward the suction port 22a is divided into an inner flow F2 and an outer flow F3 by the semi-cylindrical body 71. The inner flow F2 is drawn between the semi-cylindrical body 71 and the suction bell mouth 22. The semi-cylindrical body 71 is arranged at a position where the inner flow F2 is stronger than the outer flow F3.

The strong downward flow F1 that can develop into an air suction vortex is decomposed into two flows F2 and F3 by the semi-cylindrical body 71. Further, the inner flow F2 drawn between the semi-cylindrical body 71 and the suction bell mouth 22 is caused by a liquid flow F4 or the like drawn into the gap between the semi-cylindrical body 71 and the suction bell mouth 22 from the upstream side. Disturbed. The inner flow F2 that has lost momentum in this way collides with the edge portion at the lower end of the suction bell mouth 22 when sucked from the suction port 22a, and is further disturbed.

In this way, the semi-cylindrical body 71 can break the strong downward flow in the process of developing from the Karman vortex 7 to the air suction vortex. As a result, the semi-cylindrical body 71 can suppress the generation of an air suction vortex. As described above, the semi-cylindrical body 71 has an inner peripheral surface 71a extending in parallel with the main shaft 32. Such an inner peripheral surface 71a promotes the effect of drawing water flowing from the upstream side into the gap between the semi-cylindrical body 71 and the suction bell mouth 22. As an example, when the height of the semi-cylindrical body 71 (the length in the direction parallel to the main shaft 32) is about 0.2d to 0.4d, the generation of an air suction vortex can be effectively suppressed.

In the present embodiment, as shown in FIG. 6, the angle θ2 formed by the two lines connecting the axis O of the main shaft 32 and both side edges of the semi-cylindrical body 71 is 180 °, but this angle θ2 is 180 °. It is not limited, and may be selected within the range of 120 ° to 180 °. As shown in FIGS. 9A and 9B, the semi-cylindrical body 71 may have flanges 71b extending radially inward or radially outward from its upper and lower ends. In FIGS. 9A and 9B, the foreign matter removing device 55 is not shown. Also in this case, the semi-cylindrical body 71 has an inner peripheral surface 71a extending in parallel with the main shaft 32.

FIG. 10 is a schematic view showing one of the plurality of foreign matter removing devices 55, and FIG. 11 is a sectional view taken along line BB of FIG. 10 and 11 show one of the plurality of foreign body removing devices 55 attached to the plurality of vertical bar brackets 65. The foreign matter removing device 55 is arranged so as to surround a part of the pump operation assisting device 51, and is configured to be rotatable with respect to the pump operation assisting device 51. In the embodiment shown in FIGS. 10 and 11, the foreign matter removing device 55 is arranged so as to surround the vertical bar bracket 65, and is configured to be rotatable with respect to the vertical bar bracket 65 in the direction of the arrow in FIG. Has been done.

The foreign matter removing device 55 is fixed to a tubular body 80 rotatably attached to a part of the pump operation assisting device 51 (vertical bar bracket 65 in FIGS. 10 and 11) and an outer peripheral surface of the tubular body 80. It has a plurality of protrusions 81. In the present embodiment, the plurality of protrusions 81 are integrally formed with the tubular body 80. In one embodiment, the foreign body removing device 55 does not have to include the protrusion 81.

In the present embodiment, the outer peripheral surface of the tubular body 80 has a circular cross section. The tubular body 80 can rotate about the axial center P of the tubular body 80 in the direction of the arrow in FIG. The axis P passes through the center of the cross section of a part of the pump operation assisting device 51 (vertical bar bracket 65 in FIGS. 10 and 11) and is a part of the pump operation assisting device 51 (in FIGS. 10 and 11). , A straight line extending along the longitudinal direction of the vertical bar bracket 65).

As shown in FIG. 12A, foreign matter such as dust in the suction water tank 1 may come into contact with the foreign matter removing device 55 due to the flow of the liquid when the liquid in the suction water tank 1 is pumped up. The flowed foreign matter adheres to the foreign matter removing device 55, but the adhered foreign matter slides down from the foreign matter removing device 55 as the foreign matter removing device 55 rotates due to the flow of liquid or its own weight (see FIG. 12B). Since the foreign matter removing device 55 includes a plurality of protrusions 81, it is easy to rotate due to the flow of liquid. Further, when the foreign matter is caught on the protrusion 81, the weight balance of the foreign matter removing device 55 is lost, and the foreign matter removing device 55 is easily rotated. As an example, the width of the cross section of the entire foreign matter removing device 55 is 0.05d to 0.15d.

13 to 15 are schematic views showing another embodiment of the foreign matter removing device 55. The details of the present embodiment, which are not particularly described, are the same as those of the embodiments described with reference to FIGS. 10 to 12, and thus the overlapping description will be omitted. In one embodiment, as shown in FIG. 13, the plurality of protrusions 81 may be staggered along the axial center P of the tubular body 80. Further, in one embodiment, as shown in FIG. 14, the outer peripheral surface of the tubular body 80 may have an elliptical cross section, and as shown in FIG. 15, the outer peripheral surface of the tubular body 80 is rounded. It may have a polygonal cross section having a certain apex. In the embodiment shown in FIGS. 14 and 15, the foreign body removing device 55 does not include the protrusion 81, but in one embodiment, the foreign body removing device 55 shown in FIGS. 14 and 15 may include the protrusion 81. ..

As an example, the width in the longitudinal direction of the entire cross section of the foreign matter removing device 55 described with reference to FIG. 14 is 0.1d to 0.2d, and the width in the lateral direction is 0.04d to 0.12d. is there. As an example, the width of the cross section of the entire foreign matter removing device 55 described with reference to FIG. 15 is 0.05d to 0.1d.

FIG. 16 is a schematic view showing another embodiment of the foreign matter removing device 55, and FIG. 17 is a sectional view taken along line CC of FIG. The details of the present embodiment, which are not particularly described, are the same as those of the embodiments described with reference to FIGS. 10 to 12, and thus the overlapping description will be omitted. The foreign body removing device 55 of the present embodiment includes a support rod 83 connected to a part of the pump operation assisting device 51 (vertical bar bracket 65 in FIGS. 16 and 17) and an arch member connected to the support rod 83. The 85 and a plurality of support rod brackets 87 for connecting the support rod 83 to a part of the pump operation assisting device 51 (vertical rod bracket 65 in FIGS. 16 and 17) are provided.

The support rod 83 extends along a part of the pump operation assisting device 51 (vertical rod bracket 65 in FIGS. 16 and 17), and the support rod 83 is pumped through a plurality of support rod brackets 87. It is fixed to a part of the driving assist device 51 (vertical bar bracket 65 in FIGS. 16 and 17).

The arch member 85 has a semi-cylindrical shape, and is arranged so as to surround a part of the pump operation assisting device 51 (vertical bar bracket 65 in FIGS. 16 and 17). The arch member 85 is configured to be rotatable with respect to the pump operation assisting device 51 (vertical bar bracket 65 in FIGS. 16 and 17). The support rod 83 extends through the arch member 85 in the longitudinal direction, and the arch member 85 is configured to be rotatable around the support rod 83. More specifically, the arch member 85 is configured to swing around the support rod 83.

Also in this embodiment, the foreign matter removing device 55 rotates due to the flow of the liquid or its own weight, so that the foreign matter adhering to the foreign matter removing device 55 slides down from the foreign matter removing device 55. As an example, the width of the cross section of the entire foreign body removing device 55 of the present embodiment is 0.05d to 0.15d, from the lowest point of the outer peripheral surface of the vertical bar bracket 65 to the end of the support bar bracket 87. The length of is 0.1d to 0.2d.

FIG. 18 is a bottom view of the plurality of underwater vortex suppression plates 49 shown in FIG. As shown in FIG. 18, in the present embodiment, four underwater vortex suppression plates 49 are fixed to the lower part of the suction bell mouth 22. Two of the four underwater vortex suppression plates 49 are arranged parallel to the flow direction of the liquid in the suction water tank 1, and the other two are arranged perpendicular to the flow direction of the liquid in the suction water tank 1. However, the number of underwater vortex suppression plates 49 is not limited to this embodiment.

One end of the plurality of underwater vortex suppression plates 49 is fixed to each other on an extension line of the axis O of the main shaft 32, and the other end of each of the plurality of underwater vortex suppression plates 49 is the inner peripheral surface of the suction bell mouth 22. It is fixed to. As shown in FIG. 1, the underwater vortex suppressing plate 49 projects downward from the lower end of the suction bell mouth 22. The upper end of the underwater vortex suppression plate 49 is located higher than the lower end of the suction bell mouth 22 and lower than the impeller 31.

According to such an underwater vortex suppressing plate 49, the underwater vortex generated between the suction bell mouth 22 and the bottom surface of the suction water tank 1 can be suppressed. This underwater vortex is formed by developing a swirling flow between the suction bell mouth 22 and the bottom surface of the suction water tank 1, and when the suction bell mouth 22 is located near the bottom surface of the suction water tank 1. It is easy to occur in. The pump 20 of the present embodiment can effectively suppress the generation of the underwater vortex by eliminating the swirling flow that causes the underwater vortex with the underwater vortex suppressing plate 49. Therefore, the suction bell mouth 22 can be arranged at a lower position than the conventional structure, and water can be pumped at a low water level. Since the submersible vortex suppressing plate 49 of the present embodiment can be attached to the pump 20, it is not necessary to fix it to the suction water tank 1 which is a civil engineering skeleton, and it is possible to provide a low-cost and highly reliable pump.

FIG. 19 is a sectional view taken along line DD of FIG. Each of the plurality of underwater vortex suppression plates 49 includes a plurality of horizontal slits 90 and a plurality of horizontal bars 91 arranged in the plurality of horizontal slits 90. In the present embodiment, the plurality of horizontal bars 91 are integrally formed with the underwater vortex suppressing plate 49. A plurality of foreign matter removing devices 55 are rotatably attached to each of the plurality of underwater vortex suppressing plates 49. The plurality of foreign matter removing devices 55 are arranged so as to surround a part of the pump operation assisting device 51 (a part of the underwater vortex suppressing plate 49 in FIG. 19), and the pump operating assisting device 51 (underwater vortex suppressing plate 49). ) Is rotatable. More specifically, the foreign matter removing device 55 is arranged so as to surround the horizontal bar 91, and is configured to be rotatable with respect to the horizontal bar 91 in the direction of the arrow in FIG.

The details of the foreign matter removing device 55 attached to the underwater vortex suppressing plate 49 are the same as those of the embodiments described with reference to FIGS. 10 to 12 unless otherwise specified, and thus the overlapping description thereof will be omitted. The foreign matter removing device 55 of the present embodiment includes a tubular body 80 rotatably attached to a part (horizontal bar 91) of the pump operation assisting device 51, but does not include a plurality of protrusions 81.

In the present embodiment, the outer peripheral surface of the tubular body 80 has a circular cross section. The tubular body 80 can rotate about the axial center P of the tubular body 80 in the direction of the arrow in FIG. The axial center P is a straight line that passes through the center of the cross section of the horizontal bar 91 and extends along the lateral direction of the underwater vortex suppression plate 49.

In one embodiment, the tubular body 80 may have the configuration of each embodiment described with reference to FIGS. 14 and 15. Further, in one embodiment, the foreign matter removing device 55 may include a plurality of protrusions 81 of each embodiment described with reference to FIGS. 10 to 13.

The pump 20 includes a plurality of foreign matter removing devices 55. The plurality of foreign matter removing devices 55 are attached to a plurality of vertical bar brackets 65, a plurality of semi-cylindrical body brackets 75, and a plurality of underwater vortex suppression plates 49. In one embodiment, the plurality of foreign body removing devices 55 may be further attached to the plurality of vertical bars 61. Further, in one embodiment, the foreign matter removing device 55 is attached to at least one of a plurality of vertical bar brackets 65, a plurality of semi-cylindrical body brackets 75, a plurality of underwater vortex suppression plates 49, and a plurality of vertical bars 61. May be done.

An example of the material of the foreign matter removing device 55 of each of the above-described embodiments is a resin such as Teflon (registered trademark), but the material of the foreign matter removing device 55 is not limited to the resin. In one embodiment, the material of the foreign matter removing device 55 may be made of steel. An example of the tubular body 80 of each of the above-described embodiments is a slide bearing.

As an example, the diameters of the vertical bar bracket 65 and the semi-cylindrical bracket 75 are 0.03d to 0.1d. In the present embodiment, the vertical bar bracket 65, the semi-cylindrical body bracket 75, and the horizontal bar 91 have a circular cross-sectional shape, but in one embodiment, the vertical bar bracket 65, the semi-cylindrical body bracket 75, and the horizontal bar 91 have a circular cross-sectional shape. The cross-sectional shape of the horizontal bar 91 may be a quadrangle. Even if the vertical bar bracket 65, the semi-cylindrical bracket 75, and the horizontal bar 91 have a quadrangular cross-sectional shape, the tubular body 80 is based on the vertical bar bracket 65, the semi-cylindrical bracket 75, and the horizontal bar 91. It is configured to be rotatable.

FIG. 20 is a side view showing another embodiment of the pump 20, and FIG. 21 is a sectional view taken along line EE of FIG. The configuration of the present embodiment, which is not particularly described, is the same as that of the embodiment described with reference to FIGS. 1 to 19, and therefore the duplicate description will be omitted. In FIG. 20, the illustration of the plurality of underwater vortex suppression plates 49 is omitted. As shown in FIGS. 20 and 21, the pump operation assisting device 51 of the present embodiment further includes an arc member 76 and a plurality of arc member brackets 77 for connecting the arc member 76 to the pump casing 27. In the present embodiment, the second air suction vortex suppressing device is composed of a semi-cylindrical body 71 and an arc member 76. The arc member 76 is arranged above the semi-cylindrical body 71 and below the vertical rib 62 and the vertical bar 61. In one embodiment, the lower end of the vertical bar 61 may be in contact with the arc member 76. Further, in one embodiment, the vertical bar 61 may be fixed and connected to the arc member 76. The arc member 76 is curved along the circumferential direction of the outer peripheral surface of the pump casing 27. In this embodiment, the arc member 76 is a semicircular ring. The arc member 76 is fixed to the pump casing 27 by a plurality of arc member brackets 77 in a state where a gap exists between the outer peripheral surface of the pump casing 27 and the arc member 76.

The arc member 76 is arranged on the downstream side of the main shaft 32 with respect to the flow direction of the liquid in the suction water tank 1, and is arranged so as to surround a part of the outer peripheral surface of the pump casing 27. As shown in FIG. 21, the entire arc member 76 is located inside the pump opening 5 when viewed from the axial direction of the spindle 32. The arc member 76 is arranged at a position that obstructs the course of the flow F1. The flow F1 is split into a plurality of flows F5 by colliding with the arc member 76 before being split by the semi-cylindrical body 71, and the flow entering the semi-cylindrical body 71 is weakened. As a result, the strong downward flow that creates the air suction vortex can be dampened. As described above, the combination of the arc member 76 and the semi-cylindrical body 71 can more effectively suppress the generation of the air suction vortex.

As shown in FIG. 21, in the present embodiment, the angle θ3 formed by the two lines connecting the axial center O of the main shaft 32 and both side edges of the arc member 76 is 180 °, but this angle θ3 is limited to 180 °. However, it may be selected within the range of 120 ° to 180 °. The cross-sectional shape of the arc member 76 may be a polygon such as a circle, a quadrangle, or an L shape.

In the present embodiment, the plurality of foreign matter removing devices 55 described with reference to FIGS. 10 to 12 are attached to the plurality of arc member brackets 77. In one embodiment, the plurality of foreign matter removing devices 55 described with reference to FIGS. 13 to 17 may be attached to the plurality of arc member brackets 77. Further, in one embodiment, the foreign matter removing device 55 includes a plurality of vertical bar brackets, a plurality of semi-cylindrical body brackets 75, a plurality of underwater vortex suppression plates 49, a plurality of vertical bars 61, an arc member 76, and a plurality of arcs. It may be attached to at least one of the member brackets 77.

In one embodiment, as shown in FIG. 22, the arc member 76 may be composed of a first arc member 76A and a second arc member 76B that are separated from each other. The configuration of the present embodiment, which is not particularly described, is the same as that of the embodiment described with reference to FIGS. 20 and 21, and therefore the duplicate description will be omitted. The circumferential length of the arc members 76A and 76B of the present embodiment is shorter than the circumferential length of the arc members 76 described with reference to FIGS. 20 and 21.

The first arc member 76A and the second arc member 76B are arranged symmetrically with respect to the straight line RL'parallel to the flow direction of the liquid passing through the axis O of the main shaft 32 on the downstream side of the main shaft 32 with respect to the flow direction of the liquid. ing. Specifically, the first arc member 76A and the second arc member 76B are arranged on the straight lines L1 and L2. The straight lines L1 and L2 are straight lines that are at an angle of about 45 ° with respect to the straight line RL'and pass through the axis O of the main shaft 32.

The Karman vortex 7 is often generated on the downstream side in the liquid flow direction in the suction water tank 1 rather than the straight lines L1 and L2. Therefore, the first arc member 76A and the second arc member 76B are arranged on the straight lines L1 and L2 in order to obstruct the course of the downward flow F1 from the Karman vortex 7 to the suction port 22a. The combination of the arc members 76A and 76B of the present embodiment and the semi-cylindrical body 71 can suppress the generation of an air suction vortex in a compact configuration.

The semi-cylindrical body 71 or the combination of the semi-cylindrical body 71 and the arc member 76 is a suction water tank from the water level range of the suction water tank 1 in which the combination of the vertical rod 61 and the vertical rib 62 can suppress the generation of an air suction vortex. When the water level of 1 is further lowered (that is, when the flow velocity of the liquid in the suction water tank 1 is high), the generation of the air suction vortex can be effectively suppressed. Therefore, by combining the semi-cylindrical body 71 and the arc member 76 with the vertical rod 61 and the vertical rib 62, the generation of the Karman vortex 7 is suppressed at a wider water level and a wider flow velocity of the suction water tank 1, and harmful air suction is performed. The generation of vortices can be prevented.

In one embodiment, the pump operation assisting device 51 may include only a combination of the vertical rod 61 and the vertical rib 62 as the air suction vortex suppressing device. Further, in one embodiment, the pump operation assisting device 51 may include only the semi-cylindrical body 71 or only the combination of the semi-cylindrical body 71 and the arc member 76 as the air suction vortex suppressing device.

According to each of the above-described embodiments, there is substantially nothing that obstructs the flow of the liquid toward the suction port 22a of the suction bell mouth 22, and there is almost no suction loss. Therefore, the first air suction of each of the above-described embodiments is performed. The pump 20 equipped with the vortex suppressor (vertical rod 61 and vertical rib 62) and / or the second air suction vortex suppressor (semi-cylindrical body 71 and / or arc member 76) does not reduce the pumping capacity. It is possible to prevent the generation of harmful air suction vortices.

FIG. 23 is a schematic diagram showing still another embodiment of the pump 20. The pump 20 of the present embodiment is a preceding standby type pump. Since the details of the present embodiment not particularly described are the same as those of the embodiment described with reference to FIG. 1, the duplicated description will be omitted. The pump operation assisting device 51 of the present embodiment includes an air inflow pipe 95 that communicates with the inside of the pump casing 27 below the impeller 31, and an air inflow pipe bracket 99 that connects the air inflow pipe 95 to the flow path structure 53. It has.

The suction bell mouth 22 of the present embodiment has a through hole 98a formed at a position lower than that of the impeller 31, and an air inflow pipe 95 is connected to the through hole 98a. The air inflow pipe 95 includes a first inflow pipe 97 extending laterally from the pump casing 27 and a second inflow pipe 98 extending vertically from the first inflow pipe 97. The second inflow pipe 98 extends to a position higher than the maximum operating water level (HWL) of the pump 20, and is open to the atmosphere at a position higher than the maximum operating water level.

The pump 20 of the present embodiment rotates the impeller 31 to start the standby operation when the water level in the suction water tank 1 is low or when there is no liquid in the suction water tank 1. At the start of the standby operation, the pump 20 is operated in an aerial operation state in which the impeller 31 rotates without pumping water. When the water level rises as the liquid flows into the suction water tank 1 and reaches the gas-water mixed operating water level (for example, the lowermost position of the impeller 31: WLS), the impeller 31 causes a water pumping action, and the suction bell The gas-water mixed operation state is set in which the liquid sucked from the mouse 22 and the air flowing from the air inflow pipe 95 are sucked up at the same time. After the air-water mixed operation state is reached, the amount of air sucked from the air inflow pipe 95 decreases and the drainage flow rate increases as the water level rises. When the water level reaches the minimum water level LWL of the suction water tank 1, the inflow of air from the air inflow pipe 95 is stopped, and the operation shifts to the normal drainage operation in which only the liquid is discharged.

In the present embodiment, the air inflow pipe 95 is arranged on the downstream side of the main shaft 32 with respect to the flow direction of the liquid in the suction water tank 1, but in one embodiment, the pump operation assisting device 51 is a plurality of air inflow pipes. 95 may be provided, and at least one of the plurality of air inflow pipes 95 may be arranged on the upstream side of the main shaft 32 with respect to the flow direction of the liquid in the suction water tank 1.

In the present embodiment, the foreign matter removing device 55 described with reference to FIGS. 10 to 12 is attached to a part of the pump operation assisting device 51. More specifically, the foreign matter removing device 55 is attached to the air inflow pipe 95 (first inflow pipe 97). In one embodiment, the foreign matter removing device 55 described with reference to FIGS. 13 to 17 may be attached to a part of the pump operation assisting device 51 (first inflow pipe 97). Further, in one embodiment, the foreign matter removing device 55 may be attached to at least one of the air inflow pipe bracket 99 and the air inflow pipe 95 (first inflow pipe 97 and / or second inflow pipe 98).

Since the foreign body removing device 55 of each of the above-described embodiments is configured to be rotatable with respect to the pump operation assisting device 51 such as the vortex suppressing device and the air inflow pipe 95, the foreign body removing device 55 rotates to cause foreign matter to be removed. Foreign matter adhering to the removing device 55 can be removed. As a result, it is possible to prevent foreign matter from getting entangled with the pump operation assisting device 51 and enable stable pump operation. In addition, it is possible to reduce the burden of cleaning for removing foreign substances and improve maintainability.

The foreign matter removing device 55 of each of the above-described embodiments may be attached to a ring-shaped member as shown in Japanese Patent Application Laid-Open No. 54-7601. Each of the above-described embodiments may be applied to a pump in which a submersible bearing is arranged below the impeller as shown in Japanese Patent Application Laid-Open No. 2007-285253.

The above-described embodiment is described for the purpose of enabling a person having ordinary knowledge in the technical field to which the present invention belongs to carry out the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is construed in the broadest range according to the technical idea defined by the claims.

1 Suction water tank 2 Pump installation floor 5 Pump opening 7 Kalman vortex 20 Pump 21 Impeller casing 22 Suction bell mouth 22a Suction port 24 Discharge bowl 25 Inner bowl 27 Pump casing 28 Pumping pipe 30 Discharge curved pipe 31 Impeller 32 Main shaft 33 Suspended Lowering pipe 35 Pump base 37 Guide vane 41 Submersible bearing 41a Support member 45 Outer bearing 49 Submersible vortex suppression plate 51 Pump operation assist device 53 Flow path structure 55 Foreign matter removal device 61 Vertical bar 62 Vertical rib 65 Vertical bar bracket 71 Semi-cylindrical Body 75 Semi-cylindrical bracket 76 Arc member 77 Arc member bracket 80 Cylinder
81 Protrusion 83 Support rod 85 Arch member 87 Support rod bracket 90 Horizontal slit 91 Horizontal rod 95 Air inflow pipe 97 First inflow pipe 98 Second inflow pipe 99 Air inflow pipe bracket

Claims (13)

In the pump that pumps the liquid in the suction water tank
Main axis and
An impeller fixed to the spindle and
A flow path structure in which the main shaft and the impeller are arranged, and
A pump operation assisting device arranged outside the flow path structure and
A foreign matter removing device configured to be rotatable with respect to the pump operation assisting device is provided.
The flow path structure includes a pump casing for accommodating the impeller inside.
The foreign matter removing device is a pump arranged so as to surround a part of the pump operation assisting device. The pump according to claim 1, wherein the foreign matter removing device includes a tubular body rotatably attached to a part of the pump operation assisting device. The pump according to claim 2, wherein the foreign matter removing device further includes a plurality of protrusions fixed to the outer peripheral surface of the cylinder. The cylinder is rotatable about its axis and can be rotated.
The pump according to claim 3, wherein the plurality of protrusions are staggered along the axis. The pump according to claim 2, wherein the outer peripheral surface of the cylinder has a polygonal cross section having rounded apex. The pump according to claim 2, wherein the outer peripheral surface of the cylinder has an elliptical cross section. The foreign matter removing device includes a support rod connected to a part of the pump operation assisting device and a support rod.
With an arch member connected to the support rod,
The pump according to claim 1, wherein the arch-shaped member is configured to be rotatable around the support rod. The pump operation assisting device is
With a gap between the outer peripheral surface of the flow path structure and the vertical bar fixed to the flow path structure,
A vertical bar bracket for connecting the vertical bar to the flow path structure is provided.
The vertical bar is arranged on the downstream side of the main shaft with respect to the flow direction of the liquid.
The pump according to any one of claims 1 to 7, wherein the foreign matter removing device is attached to at least one of the vertical bar bracket and the vertical bar. The pump operation assisting device is
A semi-cylindrical body fixed to the pump casing with a gap between the pump casing and the outer peripheral surface thereof.
A semi-cylindrical bracket for connecting the semi-cylindrical body to the pump casing is provided.
The semi-cylindrical body is arranged on the downstream side of the main shaft with respect to the flow direction of the liquid.
The semi-cylindrical body has an inner peripheral surface extending parallel to the main axis.
The pump according to any one of claims 1 to 7, wherein the foreign matter removing device is attached to the semi-cylindrical bracket. The pump operation assisting device is
A semi-cylindrical body fixed to the pump casing with a gap between the pump casing and the outer peripheral surface thereof.
A semi-cylindrical bracket for connecting the semi-cylindrical body to the pump casing,
In a state where there is a gap between the pump casing and the outer peripheral surface, the arc member fixed to the pump casing and the arc member
A bracket for an arc member that connects the arc member to the pump casing is provided.
The semi-cylindrical body is arranged on the downstream side of the main shaft with respect to the flow direction of the liquid.
The semi-cylindrical body has an inner peripheral surface extending parallel to the main axis.
The arc member is curved along the circumferential direction of the outer peripheral surface of the pump casing.
The arc member is arranged above the semi-cylindrical body.
The pump according to any one of claims 1 to 7, wherein the foreign matter removing device is attached to at least one of the semi-cylindrical body bracket, the arc member bracket, and the arc member. The pump operation assist device includes an air inflow pipe that communicates with the inside of the pump casing below the impeller.
The pump according to any one of claims 1 to 7, wherein the foreign matter removing device is attached to the air inflow pipe. The pump operation assisting device is
An air inflow pipe communicating with the inside of the pump casing below the impeller,
A bracket for an air inflow pipe that connects the air inflow pipe to the flow path structure is provided.
The pump according to any one of claims 1 to 7, wherein the foreign matter removing device is attached to at least one of the air inflow pipe bracket and the air inflow pipe. The pump casing comprises a suction bell mouth having a suction port that opens downward.
The pump operation assisting device includes an underwater vortex suppressing plate protruding downward from the suction bell mouth.
The pump according to any one of claims 1 to 6, wherein the foreign matter removing device is attached to the submersible vortex suppressing plate.

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