JPS6358979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump suction port structure in a mud collection device used in various sand-sedging areas. Conventionally, removal of sand and silt from water intakes, sewage treatment plants, etc. has been done mainly by inputting the water after completely draining the water, or by attaching the pump to a mobile cart installed above the tank so that it can move freely. Previously, pressurized water was ejected around the suction port of the pump to stir the sand and silt, or when the water was not contaminated, suction and sludge removal work was carried out 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.

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 this project is to provide a pump suction port structure that can be used in a pump suction port. At the tip of the suction pipe, side plates extending in a diagonally downward direction are provided, and the lower end suction ports formed by the lower end openings of the both side plates are long in a certain direction and short in a direction perpendicular to the same. The base ends of the suction ports at the middle and lower ends of both sides are connected to the rear side plates with respect to the running direction, and an arc-shaped scraper plate that gradually extends diagonally downward and forward is vertically disposed, and the lower end of the arc-shaped scraper plate is The above-mentioned rotary pipe joint is located at a position offset from the center, and a slit extending approximately the entire length of the suction port is formed between the base end of the arc-shaped scraper plate and the rear side plate of the suction port. This is the structure of the pump suction port.

The present invention will be described in detail below with reference to the drawings. That is, the present invention provides a pump suction pipe 1 as shown in FIG.
A rotary pipe joint 2 is installed in the middle, the pump suction pipe below it is bent in a certain direction, and side plates 3, 3' that widen on both sides are installed below it, and the lower ends of the side plates 3, 3' The lower end suction port 4 constituted by the opening is short in the downward bending direction of the pump suction pipe 1 and long in the direction perpendicular thereto, and the one far from the rotary pipe joint 2 among the side plates 3, 3',
That is, the base end of an arc-shaped scraper plate 5 having an arc-shaped cross section and gradually curving diagonally downward and forward is connected to the side plate 3' corresponding to the rear side of the lower end suction port 4 when it travels. The lower end of the plate 5 is located at a position offset from the center of rotation of the rotary pipe joint 2, and a gap plate 6 is provided between this base end and the side plate 3' to form a slit 7. It is a structure that looks like it was formed.

In the present invention having such a structure, for example, as shown in FIG. If the pump main body 11, which has been sunk inside, is operated and moved to the left in FIG. Since the rotation center of the rotary pipe joint 2 is located at a position offset from the center of rotation, the arc-shaped scraper plate 5 is always moved during the above-mentioned work, no matter which direction the pump suction pipe 1 is run.
The lower end of is the optimal direction for collecting mud. That is, when the pump suction pipe 1 is run in one direction, the raking plate 5 receives resistance from water, sand, and mud, and since the raking plate 5 is always located behind the rotary pipe joint 2, it is forced to move by itself. It faces in the direction appropriate for the mud.

Therefore, the sand and mud accumulated at the bottom of the water tank 8 are removed from the scraping board 5.
It is forcibly scraped up and advances toward the lower end suction port 4.

In this case, the sand and mud may be pressed against the raking plate 5 and become quite dense, but it is loosened by the rear water flowing in from the slit 7 between the raking plate 5 and the side plate 3' and sucked into the pump suction pipe 1. be done. To explain in more detail the action of the rear water flowing in from this slit 7, 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 that can operate 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 near 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 injects from the slit with a pressure head of 8 meters.

Furthermore, the one shown in Fig. 3 has a structure in which the lower part of the rear side plate 3' is extended to a position slightly above the lower end of the scraper plate 5. Since the polluted water at the rear part of the tank 5 can be reliably sucked from the slit 7 without being scattered, there is an effect that the inside of the water tank does not get muddy during mud sampling.

As explained above, according to the present invention, there is a rotary pipe joint in the middle of the pump suction pipe, and the lower end of the scraping plate that directly collects sediment is located at a position eccentric to the rotation center of the rotary pipe joint. Therefore, when sampling mud, simply run the pump suction pipe arbitrarily, and the raking board automatically adjusts to the direction suitable for collecting mud due to the resistance of water, sand, and mud. No equipment required. Sludge is collected by forced scraping using scraping plates, and in addition to water flowing in from the front, there is also water flowing in from the rear slit, so the sand and mud are formed into a sanderch-like shape by the water flowing in from both directions. This prevents mud from solidifying on the scraping board and blocking the opening, allowing for efficient mud collection.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of one embodiment of the present invention, FIG. 2 is an explanatory diagram showing the same usage state, and FIG. 3 is an explanatory diagram of main parts of another embodiment. In the figure, 1: pump suction pipe, 2: rotary pipe joint,
3, 3': Side plate, 4: Lower end suction port, 5: Arc-shaped scraper plate, 7: Slit.

Claims (1)

[Scope of Claims] 1. In a sediment collection device using a pump, a rotary pipe joint is incorporated in the middle of the pump suction pipe, and the tip of the pump suction pipe below the rotary pipe joint is flared diagonally downward in both directions. The lower end suction ports formed by the lower end openings of the both side plates are long in a certain direction and short in the direction perpendicular to the same, and the lower end suction ports formed by the lower end openings of the both side plates are arranged in a row, and the lower end suction ports formed by the lower end openings of the both side plates are long in a certain direction and short in a direction perpendicular thereto. On the other hand, the base end is connected to the rear side plate, and an arc-shaped scraper plate that gradually extends diagonally downward to the front is vertically provided, and the lower end of the arc-shaped scraper plate is offset from the center of the rotary pipe joint. 1. A pump suction port structure in a mud collecting device, which has a slit extending substantially over the entire length of the suction port between the base end of the arcuate scraper plate and the rear side plate of the suction port. 2. A pump suction port structure in a mud collecting device according to claim 1, wherein the suction port rear side plate is extended to a position slightly above the lower end of the arc-shaped scraping plate.