JPH0312841Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a submersible dredging pump, and in particular to a strainer that removes foreign matter from dredged soil during operation, the strainer is operated by flowing water in the opposite direction to the direction in which it sucks up the soil. This invention relates to a submersible drier pump equipped with a backwashing dust removal device that can remove foreign matter attached to a strainer by backwashing it.

Conventionally, submersible drenching pumps that shake out the sediment that makes up the bottom of the water can transport the sediment to the destination via water, but foreign objects contained in the sediment or water, such as long foreign objects such as ropes, Since this clogs the submersible drier pump, it is removed using a strainer built into the pump.

However, with this type of conventional submersible draught pump, the sediment transport efficiency decreases when foreign matter accumulates in the strainer. After removing foreign objects from the strainer or replacing the strainer, the system is operated under water again. Therefore, with conventional submersible drier pumps, there has been a problem in that the submersible drier workability cannot be improved.

This invention was made in view of the above points, and in other words, this invention makes it possible to remove foreign matter adhering to the strainer as appropriate depending on the degree of clogging of the strainer in water during the dredging operation. An object of the present invention is to provide a submersible aeration pump equipped with a backwashing dust removal device.

Therefore, in order to achieve this purpose, the submersible drier pump equipped with a backwashing dust removal device of this invention is rotated by a driving device to suck up the earth and sand constituting the bottom of the water through the water and fill the hollow body. and a strainer installed in the hollow body to remove foreign matter from the soil being sucked up, and a strainer inserted in the center of the strainer to inject water for backwashing into the hollow body. The valve head moves along the axial direction of the strainer to close the dirt flow path in the hollow body, and the backwash water is transferred from the end of the flow path of the strainer to the start end of the flow path in the opposite direction to the direction in which the backwash water is sucked up. a backwashing dust removal device for backwashing and removing foreign matter adhering to the starting end of the flow path; and a backwashing device installed near the transport blade of the hollow body only when the backwashing device closes the dirt flow path. It is characterized by comprising at least a water inlet that is opened.

This invention will be explained below with reference to an illustrated embodiment.

Fig. 1 is an explanatory diagram showing submersible ahydration work using a submersible abrasive pump equipped with a backwashing dust removal device according to this invention, and Figs. 2 and 3 illustrate the configuration and operation of the same pump. FIG.

As shown in Figure 1, the dredging work vessel S,
A submersible dredge pump 1 (hereinafter referred to as a dredge pump) equipped with a backwashing dust removal device of this invention located on the water bottom B is connected to a sediment transport pipe 2, a jet high pressure water supply pipe 3a, and a jet high pressure water supply pipe 3a. Backwash water supply pipe 3
b is piped.

The detailed configuration of the above-mentioned drier pump 1 is as follows.
As shown in FIGS. 2 and 3, an approximately cylindrical hollow body portion 4 and a skirt portion 5 are connected to the upper body portion 2a to which the transport pipe 2 is connected. This upper trunk 2a
A transport blade 7 that is rotationally driven by a drive device 6 is provided inside, and the rotation of this transport blade 7 sucks up the earth and sand BS constituting the water bottom B through water and transfers it through the hollow body 4 to the transport pipe. It is configured so that it can be fed under pressure to the second side.

A strainer 8 and a backwashing dust removing device 9 are built into the hollow body portion 4 . Above strainer 8
is provided along the inner circumference of the hollow body part 4,
It is used to remove foreign matter from the sediment BS that is sucked up along with water (seawater), and as shown in Figures 4 and 5, it has a predetermined cross-sectional shape made of metal with excellent wear and corrosion resistance. A plurality of tubular passages 10 having (circular in this embodiment) flow passages 10a are bundled into a ring shape to form a collecting tube shape. Flow path starting end 10b of each tubular passage 10
The side inlet 10c is narrowed, and the inlet 10c
The opening area is smaller than the flow area of the flow path 10a and the flow path end portion 10d. Further, as shown in FIGS. 2 and 3, the backwashing dust removal device 9 includes a base 11 fixed to the hollow body 4, and is externally inserted onto the base 11 via a spring 12. A valve 13 inserted into the inner hole 8a of the strainer 8, and a plurality of water inlets 14 formed integrally with the valve 13 and provided in the narrow diameter portion 4a of the hollow body portion 4 near the transport blade 7. It has a cylindrical shutter 15 that opens and closes as the valve 13 moves.

The valve head 13a of the valve 13 faces the transport vane 7, and the diameter of the valve head 13a is
l ₁ is matched with the inner diameter l ₂ of the narrow diameter portion 4a, and the shape of the valve head 13 is designed so that the cross-sectional area of the earth and sand flow path 4b is constant in the state shown in FIG.

Further, the valve 13 is provided with a backwash water passage 13d extending from the inner hole 13b into which the base 11 is inserted to the outer peripheral body 13c.
is provided with a guide passage 11a for pushing up the valve 13 with backwash water and guiding the backwash water from the backwash water supply pipe 3d to the passage 13d.

Further, the shutter 15 is provided with a plurality of slots 15a around the entire circumference near the valve head 13a.
When the water inlet 14 is pushed up, the water inlet 14 and the slot 15a are aligned.

Therefore, the valve 13 is connected to the backwash water supply pipe 3b.
Only when backwash water is supplied through the guide passage 11a from the state shown in FIG. As shown in Figure 3, the narrow diameter portion 4a
A valve head 13a is inscribed in the inner wall of the hollow body 4, so that the earth and sand flow path 4b of the hollow body 4 can be closed.

On the other hand, on the lower side of the base 11, a rotating nozzle 16 for jetting high-pressure jet water toward the water bottom B is provided. This rotating nozzle 16 is supplied with high-pressure water from the jet high-pressure water supply pipe 3a through a jet high-pressure water passage 17 provided in the base 11, and crushes the earth and sand BS constituting the water bottom B so that it can be easily transported. It is becoming possible to do so.

Here, the backwash water guide passage 11a and the jet high-pressure water passage 17 can be opened and closed from the top of the dredging work boat S by a switching device (not shown), and the guide passage 11a and the jet high-pressure water passage 17 can be opened and closed at the same time. I've learned to never be exposed to it.

Next, the operation of the above configuration will be explained.

When the earth and sand BS constituting the water bottom B are to be shaken out, jet high-pressure water is continuously supplied to the rotary nozzle 16 from the jet high-pressure water supply pipe _3a as shown by arrow A1 in FIG. earth and sand
Jet high-pressure water is injected toward the BS to crush the earth and sand BS, and the transport blades 7 are rotated to continuously send the crushed earth and sand BS to the dredging work boat S via the transport pipe 2. i.e. crushed sediment
The BS flows from the skirt portion 5 through the inlet 10c of each tubular passage 10 of the strainer 8, the flow passage 10a, and the passage terminal end 10d, as indicated by arrows A ₂ , A ₃ , A ₄ , and A ₅ . Water (seawater) flows into the transport pipe 2 side through the jet 15 of the earth and sand flow path 4b of the hollow body part 4.
It will be pumped along with the

By the way, when the above-mentioned underwater dredging operation is performed, each adjacent tubular passage 1 of the strainer 8
As shown in FIG. 5, for example, foreign matter D adheres to the inlets 10c and 10c of No. 0 and 10 and accumulates one after another, thereby closing the strainer 8. Therefore, in that case, the next backwashing operation, that is, sending high-pressure backwashing water from the flow path end 10d side of each pipe body 10 of the strainer 8 to the inlet 10c (flow path start end 10b) side, The foreign matter D is instantly removed toward the bottom B by washing in the opposite direction to the direction in which the BS flows. Specifically, a switching device (not shown) closes the jet water passage 17, and at the same time, the backwash water is guided from the backwash water supply pipe 3b as shown by arrow _A6 using the backwash water guide passage 11a.
The backwash water is injected into the hollow hole 13b of the valve 13 and pushes up the valve 13 and the shutter 15 against the spring 12, and the valve head 13a is inscribed in the narrow diameter portion 4a to close the dirt flow path 4b and the water flows out. Open the introduction port 14.

In this state, the backwash water passes through the passage 13d of the valve 13 while pushing up the valve 13 and the shutter 15, and flows into the flow passage of each tubular passage 10 of the strainer 8, as shown by arrows _A7 to _A9 . The foreign matter D attached to the inlet 10c is sent under high pressure from the terminal end 10d to the inlet 10c and is instantly removed to the bottom B.

Note that at this time, since the water inlet 14 is opened and water (seawater) is supplied from the outside, there is no need to stop the rotation of the transport blade 7. Furthermore, since the opening area of the inlet 10c of the tubular passage 10 is smaller than other parts, there is no fear that large foreign matter will enter the tubular passage 10 and clog it.

As mentioned above, the flow path starting end 10 of the strainer 8
If foreign matter D adheres to c, dredge pump 1
The foreign matter D can be instantly removed and each tubular passage 10 of the strainer 8 can be refreshed by performing an appropriate backwashing operation without having to pull up the strainer as in the conventional method. There is no interruption to the furrowing process, and it can be resumed immediately after backwashing.

By the way, each tubular passage 10 of the strainer 8 described above has a circular flow passage cross section, but is not limited to this and may have a polygonal or other arbitrary shape. Further, the strainer 8 is not limited to one formed by collecting the tubular passages 10, and may be of other types such as a mesh shape.

As explained above, according to this invention, foreign matter that adheres to the strainer when soil is submerged in water is removed from the end of the flow path of the strainer in the opposite direction to the direction in which the soil is sucked up. The foreign matter is removed by flowing backwash water, and the water inlet is opened at that time, so foreign matter attached to the strainer can be removed from the strainer as needed while the submersible dribbling pump is in operation, without having to pull it up from the bottom of the water. The strainer can be refreshed by instant removal according to the degree of clogging, and there is no need to stop the transport vanes by supplying water from the water inlet.
This has the effect of significantly improving the workability of underwater dredging without interrupting the work.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing submersible ahydration work using a submersible abrasive pump equipped with a backwashing dust removal device according to this invention, and Figs. 2 and 3 illustrate the configuration and operation of the same pump. FIG. 4 is a perspective view of the strainer, and FIG. 5 is a sectional view of the strainer. 1... Submersible drier pump equipped with a backwashing dust removal device, 2... Transport pipe, 3a... Jet water supply pipe, 3b... Backwash water supply pipe, 4... Hollow body,
4b...Sediment channel, 5...Skirt portion, 6...Transportation blade drive device, 7...Transportation blade, 8...Strainer, 9...Backwashing dust removal device, 10...Tubular passage, 11... Base, 11a... Backwash water passage,
13... Valve, 13a... Valve head, 13
b...Middle hole, 13d...Backwash water passage, 14...
...Water inlet, 15...Shutter.

Claims (1)

[Scope of utility model registration request] Transport vanes that are rotated by a drive device to suck up sediment constituting the bottom of the water through water and force-feed it to the transport pipe side through a hollow body, and a strainer that is installed in the hollow body and removes foreign matter from the sucked up sediment. When the strainer is inserted into the center of the strainer and backwash water is injected, the valve head moves along the axial direction of the hollow body to close the dirt flow path in the hollow body and at the same time drain the backwash water. a backwashing dust removal device for backwashing and removing foreign matter adhering to the flowpath starting end by flowing the soil from the end of the flow path of the strainer in the opposite direction to the direction in which it sucks up the dirt, and the hollow shell; and a water inlet that is provided near the transportation blade of the section and is opened only when the backwash dust removal device closes the dirt flow path. pump.