JP7637604B2 - Column type submersible pump and chain holder - Google Patents

Description

The technology disclosed herein relates to a column-type submersible pump and a chain holder.

Patent Document 1 discloses a column-type submersible pump. The column-type submersible pump includes a cylindrical column that is installed perpendicular to the upper wall of the water intake tank, and a submersible pump that is installed at the lower end of the column. The column forms a pipeline. In the column-type submersible pump described in Patent Document 1, the column is composed of a first cylindrical column, a second cylindrical column, and a lid. The first column is installed in a hanging manner from the upper wall of the water intake tank. The second column is installed above the upper wall of the water intake tank and communicates with the first column. An outlet port is provided on the peripheral surface of the second column so as to protrude radially outward. A drain pipe is connected to the outlet port. The lid closes the upper end opening of the second column.

When the submersible pump is operating, water is drawn from the intake tank by the submersible pump, and the pumped water discharged from the submersible pump flows vertically from the first column to the second column. In the second column, the flow direction is changed from vertical to horizontal, and the pumped water is discharged into a drainage pipe connected to the discharge port.

A suspension chain is connected to the submersible pump, which is used to install and lift the submersible pump. In the column-type submersible pump of Patent Document 1, the upper end of the suspension chain is hooked to a chain support rod disposed between the second column and the lid.

In more detail, in the column-type submersible pump of Patent Document 1, a lid is attached to the upper surface of a flange portion provided at the upper end of the second column via an annular intermediate flange plate, and a chain support bar is arranged between radially opposing cutout grooves formed in the intermediate flange plate. A locking portion is attached near the center of the chain support bar, and the upper end of the hanging chain is locked to the locking portion.

According to this configuration, the chain support rod is located above the discharge port of the second column and is offset from the main flow in the column, and the locking portion is located in the radial center of the column. Therefore, the hanging chain is arranged approximately vertically along the central axis of the column, and slack in the hanging chain can be minimized. In the column-type submersible pump described in Patent Document 1, the hanging chain is locked in an appropriate position, so that vibration of the hanging chain caused by water flow during operation of the submersible pump can be suppressed, and damage to the cable of the submersible pump or the inner surface of the second column, and damage to the hanging chain itself due to sudden tension can be effectively prevented.

JP 2004-196525 A

Incidentally, such column-type submersible pumps are sometimes installed in pumping stations where land-type pumps have traditionally been installed, replacing the land-type pumps. In such cases, in pumping station buildings that were not originally designed for the installation of column-type submersible pumps, sufficient height cannot be secured when installing the submersible pump within the column, which can cause problems during installation work.

Figure 6 illustrates an example of how a submersible pump is installed in a column. In the column-type submersible pump 10 described in Patent Document 1, the chain support rod 20 to which the hanging chain is attached is fixed to the upper part of the second column 22. After the submersible pump 3 is installed in the first column 21, in order to attach the upper end of the hanging chain connected to the submersible pump 3 to the chain support rod 20, the second column 22 must be connected to the first column 21 in advance when the submersible pump 3 is installed in the first column 21. Therefore, as shown in Figure 6, the submersible pump 3 must be installed in the first column 21 with the second column 22 protruding upward above the upper wall 91 of the water intake tank 9. Here, the dashed line in Figure 6 indicates, for example, the position of the lowest end of the crane used to install the submersible pump 3. Since the second column 22 protrudes upward from the upper wall 91 by a height of H2, it is difficult to ensure that the distance H1 from the second column 22 to the lowest end of the crane is sufficiently long relative to the total height of the submersible pump 3.

In other words, while the column-type submersible pump 10 described in Patent Document 1 uses the chain support rod 20 to properly position the hanging chain and suppress vibration of the hanging chain, it has the problem that the installation of the submersible pump 3 is difficult.

The technology disclosed here improves the ease of installation of column-type submersible pumps while optimizing the hooking position of the hanging chain.

The technology disclosed herein relates to a column-type submersible pump. The column-type submersible pump includes a tubular first column arranged vertically, a submersible pump installed at the lower end of the first column, a second column detachably connected to the upper end of the first column to form a pipeline together with the first column and having a discharge port opening in the horizontal direction, a hanging chain connected to the submersible pump in the pipeline, and a holder separate from the second column and provided in the second column, the holder having legs fixed to the upper end of the first column and a main body provided with a locking portion to which an upper end of the hanging chain is locked, the legs extending upward from the upper end of the first column, the main body continuing to the upper ends of the legs and extending in the radial direction of the second column, and the locking portion being located above the discharge port in the second column.

According to this configuration, the column-type submersible pump is provided with a holder. The holder has legs fixed to the first column and a main body provided with a locking portion to which the hanging chain is locked. Because the legs are fixed to the upper end of the first column, the holder is separate from the second column and is not fixed to the second column. When installing the submersible pump in the first column, it is not necessary to connect the second column to the first column in advance. As a result, the second column does not protrude upward from the upper wall of the intake tank of the pump station, and a space in the vertical direction is created that is equivalent to the height of the second column. Since a space sufficiently larger than the total height of the submersible pump can be secured, the installation work of the submersible pump can be easily performed. The ease of installation of the submersible pump is improved in the column-type submersible pump.

After the submersible pump is installed at the lower end of the first column, the second column is connected to the upper end of the first column. When the second column is attached to the first column, the holder is positioned inside the second column. In addition, the upper end of the hanging chain connected to the submersible pump is engaged with a locking portion provided on the holder.

The retainer has a main body portion connected to the legs extending upward, and the locking portion provided on the main body portion is located above the discharge port of the second column. The main stream in the pipeline flows vertically from the first column to the second column, and then the flow direction is changed from vertical to horizontal in the second column and discharged from the discharge port into the drain pipe. Since the locking portion is located above the discharge port, it is located at a position outside the main stream in the pipeline. The locking portion may be provided on the legs as long as it is above the discharge port of the second column.

The locking portion is preferably located in the main body of the retainer, in the radial center of the pipeline. When the locking portion is located in the radial center of the pipeline, the hanging chain is arranged approximately vertically along the central axis of the pipeline, minimizing slack in the hanging chain. As a result, vibrations of the hanging chain caused by water flow can be suppressed while the submersible pump is in operation, effectively preventing damage to the cable of the submersible pump or the inner surface of the second column, and damage to the hanging chain itself due to sudden tension.

The above configuration therefore improves the ease of installation of the underwater pump while ensuring that the suspension chain is properly secured in place.

The main body may be provided with a cable support portion that supports a cable connected to the underwater pump.

In this way, the cable, like the hanging chain, is arranged within the pipe parallel to the central axis and approximately perpendicular, minimizing cable slack, effectively suppressing cable vibrations caused by water flow and preventing damage to the cable.

The holder may have a pair of legs provided on either side of the body portion extending radially and fixed to the upper end of the first column, and the holder may have a gate shape formed by the pair of legs and the body portion.

The gate-shaped holder has high rigidity, so the holder is stably positioned within the second column.

The technology disclosed herein relates to a column-type submersible pump comprising a tubular first column arranged vertically, an underwater pump installed at the lower end of the first column, and a second column detachably connected to the upper end of the first column to form a pipeline together with the first column and having an outlet opening in the horizontal direction, and relates to a holder that holds a hanging chain connected to the underwater pump within the second column.

This chain holder has legs fixed to the upper end of the first column and a body provided with a locking portion to which the upper end of the hanging chain is locked, the legs extending upward from the upper end of the first column, the body continuing to the upper end of the legs and extending in the radial direction of the second column, and the locking portion being located in the second column above the discharge port. Furthermore, it is preferable that the locking portion be located in the radial center of the pipeline.

As mentioned above, by using this retainer, vibrations of the hanging chain caused by water flow can be suppressed, and the submersible pump can be easily installed on the first column.

The above-mentioned column-type submersible pump and chain holder can improve the installation of the submersible pump while properly aligning the hanging chain.

FIG. 1 illustrates a column type submersible pump. FIG. 2 is an exploded perspective view illustrating the second column and the holder. FIG. 3 illustrates a portion of the installation procedure for the submersible pump. FIG. 4 illustrates a portion of the installation procedure for the submersible pump. FIG. 5 is a perspective view showing a modified example of the holder. FIG. 6 illustrates a state in which a submersible pump is installed in a conventional column-type submersible pump.

Below, an embodiment of a column-type submersible pump and a chain holder will be described with reference to the drawings. The column-type submersible pump and the chain holder described here are examples.

Figure 1 illustrates a column-type submersible pump 1. The column-type submersible pump 1 is configured to suck up water from a water intake tank 9 and discharge it from a discharge pipe. The column-type submersible pump 1 includes a column 2 and a submersible pump 3.

The column 2 is installed perpendicular to the upper wall 91 of the water intake tank 9. The column 2 is cylindrical and forms a pipeline through which water flows. The column 2 is composed of a first column 21, a second column 22, and a lid 23. The first column 21 hangs down from the upper wall 91. The first column 21 is disposed inside the water intake tank 9. The second column 22 is connected to the upper end of the first column 21. The second column 22 is detachably attached to the first column 21. The second column 22 protrudes upward from the upper wall 91 of the water intake tank 9. The lid 23 is attached to the upper end of the second column 22 and closes the upper end opening of the second column 22.

The second column 22 has a discharge port 24. The discharge port 24 is provided on the peripheral surface of the second column 22. The discharge port 24 protrudes horizontally and radially outward from the peripheral surface of the second column 22. A discharge pipe (not shown) is connected to the discharge port 24.

The submersible pump 3 is installed at the lower end of the first column. The submersible pump 3 takes in water from the intake tank 9 through the lower end opening of the first column 21 and discharges it upward. The pumped water discharged from the submersible pump flows vertically from the first column 21 to the second column 22. Then, in the second column 22, the flow direction is changed from vertical to horizontal, and the pumped water is discharged into a drainage pipe connected to the discharge port 24 (see the arrow in Figure 1).

A hanging bracket 31 is attached to the top of the submersible pump 3. The lower end of the hanging chain 4 is connected to this hanging bracket 31. The hanging chain 4 is arranged vertically inside the column 2.

A first cable 32 and a second cable 33 are connected to the submersible pump 3. These cables 32 and 33 are cables for powering and controlling the submersible pump 3.

The column-type submersible pump 1 is equipped with a holder 5. The holder 5 is disposed within the second column 22. The holder 5 is engaged with the upper end of the hanging chain 4 and holds the hanging chain 4. As shown in FIG. 2, the holder 5 is equipped with a pair of legs 51 and a main body 52. The holder 5 has a gate shape overall.

The pair of legs 51 each extend vertically, and their lower ends are fixed to the upper end of the first column 21. As shown in more detail in an enlarged view in FIG. 1, a fixing portion 511 bent radially outward is integrally provided at the lower end of the leg 51. The lower surface of the L-shaped fixing portion 511 abuts against the upper surface of a flange 211 provided at the upper end of the first column 21. The fixing portion 51 is fixed to the flange 211 by, for example, a fastening member (not shown).

The pair of legs 51 are arranged to face each other in the radial direction of the first column 21. The main body 52 is configured in the shape of a rod extending horizontally. The main body 52 is arranged to bridge the upper ends of the pair of legs 51. The height position of the main body 52 is set to a height position corresponding to the upper end of the second column 22 when the second column 22 is attached to the upper end of the first column 21 (see the enlarged view in Figure 1).

The main body 52 is provided with a locking portion 53. The locking portion 53 is located in the center of the main body 52 in the longitudinal direction. The locking portion 53 is located on the central axis of the column 2 within the column 2. The upper end of the hanging chain 4 is locked to the locking portion 53. Since the locking portion 53 is located on the central axis of the column 2, the hanging chain 4 is disposed approximately vertically along the central axis of the column 2. In this case, the length of the hanging chain 4 is set to a length such that the hanging chain 4 is stretched between the locking portion 53 and the hanging bracket 31 of the submersible pump 3 when the submersible pump 3 is disposed at the lower end of the first column 21. Note that the middle portion of the hanging chain 4 is not shown in FIG. 1 etc.

The main body 52 is provided with a first cable support 521 that supports the first cable 32 and a second cable support 522 that supports the second cable 33, on either side of the locking portion 53. As with the hanging chain 4, the first cable 32 and the second cable 33 are also arranged parallel to the central axis and approximately perpendicular within the column 2, minimizing slack in the first cable 32 and the second cable 33.

An intermediate flange 25 is interposed between the flange 211 at the upper end of the first column 21 and the flange 221 at the lower end of the second column 22. The flange 221 of the second column 22 is fixed to the flange 211 of the first column 21 via the intermediate flange 25.

As shown in FIG. 2, the intermediate flange 25 is annular. The intermediate flange 25 functions as a spacer between the first column 21 and the second column 22. In other words, the intermediate flange 25 has a thickness corresponding to the thickness of the fixing portion 511 of the leg portion 51, and has recesses 251 at two radially opposing locations (see also the enlarged view in FIG. 1). The fixing portion 511 of the leg portion 51 is located within the recesses 251.

This intermediate flange 25 ensures watertightness of the connection between the first column 21 and the second column 22 while the leg 51 of the retainer 5 is fixed to the upper surface of the flange 211 of the first column 21.

According to the column-type underwater pump 1 having this configuration, the locking portion 53 provided on the holder 5 is located above the discharge port 24 in the second column 22 and at the center of the column 2 in the radial direction. As a result, the hanging chain 4 in the column 2 is arranged straight and without slack along the central axis of the column 2. In addition, the locking portion 53 is located at a position above the main flow in the column 2. This prevents the hanging chain 4 from vibrating due to water flow during operation of the underwater pump 3. Damage to various parts is prevented. In addition, the first cable 32 and the second cable 33 are also arranged straight in the column 2 like the hanging chain 4, so that vibration of the first cable 32 and the second cable 33 is similarly suppressed during operation of the underwater pump 3, and damage to various parts is prevented.

Next, the installation procedure for the column-type submersible pump 1 will be described with reference to Figures 3 and 4. Note that in Figures 3 and 4, the hanging chain 4, the first cable 32, and the second cable 33 may be omitted in order to make the drawings easier to see.

First, as shown in P1 of FIG. 3, the first column 21 is installed on the upper wall 91 of the intake tank 9. At this time, the second column 22 is not connected to the first column 21. Therefore, the second column 22 does not protrude above the upper wall 91, and there is a space above the upper wall 91 corresponding to the height H2 of the second column 22. Even if the height inside the pumping station is low, the submersible pump 3 can be suspended by a crane using a space (H1 + H2) that is larger than the total height of the submersible pump 3, and the submersible pump 3 can be inserted into the interior from the upper end opening of the first column 21 and installed at the lower end of the first column 21.

Next, as shown in P2 of FIG. 3, the holder 5 is fixed to the upper end of the first column 21. The holder 5 has its fixing portion 511 fixed to the flange 211 at the upper end of the first column 21, for example by a fastening means. Then, the upper end of the hanging chain 4 connected to the hanging bracket 31 of the submersible pump 3 is engaged with the engaging portion 53 of the holder 5. In addition, the intermediate flange 25 is placed on the flange 211 at the upper end of the first column 21.

Next, as shown in P3 of FIG. 4, the second column 22 is connected to the first column 21. More specifically, the second column 22 suspended by the crane is inserted from above the holder 5 so that the holder 5 is inserted from the lower end opening of the second column 22, and the flange 221 at the lower end of the second column 22 is placed on the intermediate flange 25. Here, the first cable 32 and the second cable 33 may be supported by the first cable support portion 521 and the second cable support portion 522 of the holder 5 either before or after the second column 22 is placed.

In addition, in FIG. 4, for ease of understanding, the holder 5 is drawn in an orientation in which the leg 51 of the holder 5 and the discharge port 24 of the second column 22 overlap, but the leg 51 of the holder 5 and the discharge port 24 of the second column 22 are offset in the circumferential direction as shown in FIG. 2. This prevents the leg 51 from being disposed across the discharge port 24.

The flange 221 at the lower end of the second column 22 is fixed to the flange 211 at the upper end of the first column 21 by a fastening member via the intermediate flange 25. The first cable 32 and the second cable 33 are supported by the first cable support part 521 and the second cable support part 522 of the holder 5, respectively, and are pulled out from the upper end opening of the second column 22.

Finally, as shown in P4 of FIG. 4, the lid 23 is attached to the upper end opening of the second column 22. At this time, the first cable 32 and the second cable 33 are arranged to pass through the lid 23 (see FIG. 1).

In this manner, because the retainer 5 is fixed to the first column 21, there is no need to connect the second column 22 to the first column 21 when installing the submersible pump 1 on the first column 21. As a result, as described above, the space above the upper wall 91 can be fully utilized, improving the ease of installation of the submersible pump 3.

Although the retainer 5 is configured to be fixed to the first column 21, the vertically extending legs 51 position the locking portion 53 above the upper end of the first column 21. To be precise, the locking portion 53 is located above the discharge port 24 of the second column 22. Therefore, as described above, the locking portion 53 is located above the main flow in the column 2 and at the radial center of the column 2. In this way, the installation of the submersible pump 3 can be improved while the locking position of the hanging chain 4 is properly adjusted.

(Modification)
The holder 5 is not limited to the shape shown in Fig. 2. For example, as illustrated in Fig. 5(a), the holder 50 may have one leg 51, and the main body 52 may be supported by the leg 51 in a cantilever manner. Also, as illustrated in Fig. 5(b), the holder 500 may have four legs 51, and the four legs 51 may support the main body 52 that is cross-shaped in a plan view. Although not illustrated, the holder 500 may have three legs 51.

The retainers 5, 50, and 500 may also be integral with the intermediate flange 25.

1 Column type submersible pump 2 Column (pipe)
21 First column 22 Second column 24 Discharge port 3 Submersible pump 32 First cable 33 Second cable 4 Suspension chain 5 Holder 50 Holder 500 Holder 51 Leg 52 Main body 521 First cable support 522 Second cable support 53 Locking portion

Claims (4)

a vertically disposed tubular first column;
A submersible pump installed at a lower end of the first column;
a second column detachably connected to an upper end of the first column to form a pipeline together with the first column , the second column having a discharge port opening in a horizontal direction;
a suspension chain connected to the submersible pump within the pipeline;
a retainer that is separate from the second column and is provided within the second column;
the holder has a leg portion fixed to an upper end portion of the first column and a main body portion provided with a locking portion to which an upper end of the suspension chain is locked,
The leg portion extends upward from an upper end of the first column,
The main body portion is continuous with an upper end portion of the leg portion and extends in a radial direction of the second column,
A column-type submersible pump, wherein the engaging portion is located above the discharge port within the second column.
The column type submersible pump according to claim 1,
A column-type submersible pump, wherein the main body portion is provided with a cable support portion that supports a cable connected to the submersible pump. The column type submersible pump according to claim 1 or 2,
the retainer has a pair of legs provided on both sides of the body portion extending in a radial direction and fixed to an upper end of the first column,
A column-type submersible pump, wherein the holder has a gate shape formed by the pair of legs and the main body. a vertically disposed tubular first column;
A submersible pump installed at a lower end of the first column;
a second column detachably connected to an upper end of the first column to form a pipeline together with the first column and having a discharge port opening in a horizontal direction; and
A leg portion fixed to an upper end portion of the first column;
A main body portion provided with a locking portion to which the upper end of the hanging chain is locked,
The leg portion extends upward from an upper end of the first column,
The main body portion is continuous with an upper end portion of the leg portion and extends in a radial direction of the second column,
The chain holder, wherein the engaging portion is located above the discharge port within the second column.