JPH0137537B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump suction port structure in a sediment collecting device used in various types of settling basins. Conventionally, removal of sand and silt from water intakes, sewage treatment plants, etc. has been done mainly manually after the water has been completely drained, or by attaching the pump to a movable trolley built above the tank. Previously, pressurized water was ejected around the suction port to agitate the sand and silt, or when the water was not contaminated, suction and sludge removal work was performed using only the suction power of the pump without ejecting pressurized water. Because the structure of the pump suction port was simply an opening in the shape of a ripple, the range in which it could suck sand and silt was very narrow. There were various drawbacks such as clogging, and the inside of the tank becoming cloudy if pressured water was jetted or mechanically agitated to suspend sand and silt.

As a technique for solving such problems, there is an invention disclosed in Japanese Patent Publication No. 36-6281, for example.
A water hole is provided separately from the earth and sand suction port, but in order to orient the earth and sand suction port in the desired direction with this device, the main body itself must be mechanically rotated, which is complicated to operate. Moreover, if the direction of the suction port does not sufficiently match the direction of movement of the ship, there is concern that efficiency will be reduced.

Furthermore, as a similar prior art,
There is an excavator shown in Publication No. 161041, but this requires a "damper in the storage box" to change the direction of the suction port, an arm to move it, etc., and has a complicated structure. Since there is no way to increase the suction effect by taking in water, there is a concern that the suction port may become clogged and water cannot be pumped.

The present invention solves the above-mentioned drawbacks, and can efficiently suck sand and silt without making the inside of the tank cloudy, and without requiring a particularly large-scale device to direct the suction port in the desired direction. The purpose of the present invention is to provide a pump suction port structure that can be used in a pump suction port. Furthermore, the suction port member is composed of side plates extending symmetrically downward in both diagonal directions from the pin-connected upper end, and arcuate scrapers that are vertically disposed below each side plate at a required interval. , and the lower end suction ports formed by the lower end openings of the same side plates and both arcuate scrapers are both long in the direction perpendicular to running and short in the running direction, and furthermore, there is a This is a pump suction port structure in a sludge sampling device formed by forming a slit over almost the entire length.

The present invention will be described in detail below with reference to the drawings.

That is, as shown in FIGS. 1 and 2, without using a turning device for the pump suction pipe 1, a side plate 2, which is provided at the lower end of the pump suction pipe 1 and extends in a shape that widens toward both sides,
2, and a suction port member 4 consisting of scrapers 3, 3 each having an arcuate cross section located below each of the side plates 2, 2, the upper end of which is tiltably attached with a pin 5, A gap plate 6 is disposed between the upper ends of both scrapers, and scrapers 3, 3 each having an arcuate cross section are suspended from both sides of the gap plate. It has a structure in which slits 7 are formed and inflow water is taken in through the slits 7 between the scrapers. In the structure shown in FIGS. 1 and 2, for example, when the pump suction pipe 1 is moved to the right in FIG. The raking plate 3 on the left side comes into close contact with the lower end of one of the suction pipes 1 as shown in FIG. They also help suck up sand and mud.

As shown in FIGS. 1 and 2, for example, as shown in FIG. If the pump main body 11, which has been sunk in the water tank 8, is operated and moved, for example, to the right in FIG. and moves toward the suction port 12 on the right side.

In this case, the sand and mud are pressed against the scraper plate 3 and become quite dense, but they are loosened by the rear water flowing in from the slit 7 provided at the rear of the scraper plate 3 and sucked into the pump suction pipe 1. It is. In other words, the sand and mud that have been pushed up along the upper surface of the raking plate 3 are sandwiched between the inflowing water from the front and the inflowing water from the slit 7 at the rear in a sandwich-like state, and are smoothly sucked up.

To explain this in more detail, this type of pump is generally designed to be able to pump water normally under a suction force (negative pressure) of about 6 meters.
For example, if a pump operated with negative pressure of 6 meters is located at a depth of 2 meters and the suction port opens at a depth of 3.2 meters, then at slit 7, the inside of the slit = -6 + (3.2 - 2.0 ) = -4.8 Outside the slit = 3.2 Pressure difference between the inside and outside of the slit = -4.8 + -3.2 = -8.0 In other words, external water will be injected from the slit with a pressure head of 8 meters.

Note that if the lower end of the side plate 2 in front of the suction port 12 is made into a sharp cross-sectional state so as to increase the inflow resistance,
The internal negative pressure of the suction device increases accordingly, and the suction force increases accordingly.

As mentioned above, with the device shown in Figs. 1 and 2, the pump suction pipe 1 does not require a turning device even when the running direction is not only a fixed direction but also the opposite direction when collecting mud. By moving itself, the scrapers 3, 3 automatically swing to a state where mud can be collected, and the polluted water between the two scrapers is reliably absorbed through the slit 7.

As explained above, according to the present invention, sand and mud are forcibly introduced into the openings by the scraping board, so even sand and mud that have solidified considerably can be scraped up, and it reaches the top of the scraping board. After sludge, the water flowing in from the front and the water flowing in from the rear slit form a sanderch-like shape, so that it does not solidify on the scraping plate and block the opening, making it possible to collect mud efficiently.

In addition, the present invention allows the suction pipe to be moved back and forth or in all directions and the suction port automatically points in the appropriate direction during soil sampling work, so it is always efficient without the need for a special device to direct the suction port in the appropriate direction. can perform good work.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of the present invention, FIG. 2 is a sectional view taken along the line--FIG. 1, and FIG. 3 is an explanatory view showing the same state of use. In the figure, 1: pump suction pipe, 3: scraper plate, 5: pin, 6: gap plate, 7: slit.

Claims (1)

[Claims] 1. In a pump-based sediment collecting device, the upper end of a suction port member is attached to the lower end of the pump suction pipe so as to be tiltable by means of a pin connection, and the suction port member is symmetrical with respect to the upper end portion connected with the pin. It consists of side plates extending diagonally downward in the form of a shape, and arc-shaped scrapers that are vertically installed below each of the side plates at a required interval, and the lower end openings of the side plates and both arc-shaped scrapers are Both of the lower end suction ports are long in the direction perpendicular to the travel direction and short in the travel direction, and a slit is formed between the upper end portions of the arcuate scrapers extending approximately the entire length thereof. Suction port structure.