JPS60173400A - Jet pump - Google Patents

Abstract

PURPOSE:To improve the efficiency of a jet pump, by composing the pump of a main pipe having a suction port and a discharge port as a straight pipe, and plural high-pressure water ejection nozzles provided in the body of the main pipe near the suction port and oriented to the discharge port. CONSTITUTION:A main pipe 12 having a suction port 21 and a discharge port 22 as a straight pipe is provided with plural nozzles 23 near the suction port 21 to eject high-pressure water W. The high-pressure water W ejected from the nozzles 23 proceeds to the discharge port 22 along a passage wall 26a so that the total pressure near the suction port 21 is heightened. Since the jamming of garbage and the like do not occur and there are no bends and projections inside, the loss of energy is small. The efficiency of a jet pump is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jet pump that is often used for pumping up underground water, for filling up with water when starting a large pump, for sucking up ash, sand, mud, etc.

Examples of conventional jet pumps of this type include those shown in FIGS. 1 and 2, for example.

In the example shown in FIG. 1, a nozzle 3 is inserted into a straight main pipe 1 from the middle of its body 2, and high-pressure water W is injected into a diffuser 5 connected to a discharge port 4 of the main pipe 1. ing. Then, a predetermined total pressure increase is given by the injection of high-pressure water W from the nozzle 3, and sewage or the like is pumped up through the suction port 8, the discharge port 4, and the diffuser 5.

In the example shown in FIG. 2, a short pipe 11 is attached to the bend part B of a main pipe 10 having a bend part B, and a nozzle 12 for jetting high-pressure water W is provided in the short pipe 11. Then, as in the example shown in FIG.
A predetermined total pressure increase is given to the injection of water, and waste water or the like is pumped up through the suction port 14, the discharge port 15, and the discharge pipe 16.

However, since jet pumps originally mix water streams from two systems, there is a large energy loss, and the efficiency cannot be said to be very good [generally said to be 20 to 25 inches, but depending on the conditions of the high-pressure water W, it may be possible to There are also the following. ], In the example shown in FIG. 1, energy loss is added due to the nozzle 3 protruding into the main pipe l, so there is a problem that a diffuser 5 is required to solve this problem. there were. Furthermore, in the example shown in Fig. 2, although the nozzle 12 does not protrude into the main pipe lo,
There was energy loss due to the bend part B, making it impossible to improve efficiency.

Furthermore, on both sides of FIGS. 1 and 2, the main pipe l.

10 and the nozzle 3. If the center axis of j2 does not match, the efficiency will be greatly reduced, and the diffuser 5 will be easily clogged with dust, so it will not be possible to use a large aperture. It was also said that a significant increase in efficiency could not be expected.

This invention was made in view of the above-mentioned conventional problems.
The object of the present invention is to provide a jet pump that is highly efficient and has a simple structure.

Specifically, the jet pump according to the present invention is
It consists of a straight main pipe with a suction port and a discharge port, and a plurality of nozzles for high-pressure water injection directed toward the discharge side of the main pipe, which are provided in the body near the suction port of the main pipe.

Embodiments of the present invention will be described below based on the drawings. FIG. 3 is a diagram showing an embodiment of the jet pump according to the present invention, and FIG. 4 is a diagram showing a sludge suction and boiling device using the embodiment shown in FIG. 3.

First, the configuration will be described. In the figure, 20 is a main pipe, which has a substantially straight pipe shape and is provided with a suction port 21 and a discharge port 22. A plurality of nozzles 23 for injecting high-pressure water Wtg are provided near the suction port 21 of the main pipe 2o, and are attached to an annular high-pressure water introduction pipe 25 disposed in the body 24 of the main pipe 2o. The high-pressure water introduction pipe 25 is connected to a high-pressure hose 25a via a mounting member 25b.

Passage 26 between the suction port 21 and the discharge port 22 in the main pipe 20
serves as a chamber for mixing the high-pressure water W with sucked sewage, sludge, etc., and the nozzle n has an inversely tapered cross-sectional shape extending from the discharge port 22 to the mounting position. Nozzle 2
The high-pressure water W from 3 is sprayed from the side surface 26 of this passage 26.
It is performed in such a way that it follows the lines a and K. In the illustrated example, the angle α between the injection direction of the high-pressure water W and the central axis of the passage 26 is 16°, and the angle β between the side surface 26 a of the passage 26 and the central axis is 16°.
is set to 14°. In addition, 27 in the figure is a connecting pipe,
28 is attached with bolts.

Next, a configuration in which the jet pump configured as described in section 2 is used in a sludge suction and boiling device will be explained.

In this case, the jet pump JP is attached to the lower end of the connecting pipe 27 as shown in FIG.
is attached to the sludge transfer hose 29 of the sludge suction and boiling device. A high-pressure water introduction pipe 25 connected to each nozzle 23 of the jet pump JP and a multistage pump 30 for generating high-pressure water W
The high pressure hose 25a is connected to the discharge side of the high pressure hose 25a. still,
In the figure, 31 is a high-pressure water tank, 32 is a water suction pipe, and 33 is a control valve.

Next, the operation of the jet pump JP according to the embodiment shown in FIG. 3 will be explained with the jet pump JP installed in the sludge suction and boiling device as shown in FIG. 4.

First, the suction port 21 of the V pump JP is placed above the sludge F to be sucked, and the multistage pump 30 is started.

The multi-stage pump 30 converts the water drawn from the high-pressure water tank 31 into high-pressure water W, and the control valve 33 uses appropriate control means.
is opened, and the water is injected from each nozzle 23 into the passage 26 of the main pipe 20 via each high-pressure water introduction pipe 25.

High pressure water Wf'i injected from nozzle 23, passage 2
6 toward the discharge port 22 side, and its kinetic energy increases the total pressure near the suction port 21. At this time, since the nozzle 23 is provided not on the central axis of the passage 26 but on the surrounding body 24, the flow velocity in the circumferential part of the passage 26 is also close to that in the central part, and the flow velocity in the passage 26 is approximately equal. becomes.

The sludge F is sucked in from the suction port 2'', and is transferred while being mixed with the high-pressure water W within the passage 26, the connecting pipe 27 following it, and the sludge transfer nozzle 29. At this time, the high-pressure water W in the passage 26 heads toward the discharge port 22 along the side surface 26a, and there is no protrusion or bend in the passage 26, and there are almost only straight or smooth curved surfaces, so there is no energy loss. A large amount of 6′1τ] that would lead to this does not occur, and the sludge F is transferred without stagnation or the like.

It is economical for this jet pump to have a size of 3 to 5 inches in view of the multistage pump's ability and resistance to clogging.

As explained above, the jet pump according to the present invention has a structure in which a high-pressure water injection nozzle facing the discharge port is attached to the body of a straight main pipe equipped with a suction port and a discharge port. Since multiple tubes are installed nearby, the structure is simple and there is no possibility of dirt clogging, and since there are no bends or protrusions inside, energy loss is reduced and the efficiency is very high. There is an effect that it can be done. and,
The suction flow rate is faster than conventional ones with the same capacity, and the cross-sectional area of the suction port can be made larger than with conventional ones with the same head.
A certain degree of efficiency improvement can be expected. In the illustrated embodiment, water is injected from all nozzles, but if the pumping height is small, air can be mixed in from several nozzles to increase the suction efficiency and reduce the amount of sludge that has been sucked in. It is also possible to make the objects have buoyancy.

[Brief explanation of the drawing]

1 and 2 are sectional views of a conventional jet pump, FIG. 3 is a sectional view of an embodiment of the present invention, and FIG. 4 is a sectional view of the embodiment of FIG. It is an explanatory diagram showing an example used for a device. 20... Main pipe 21... Suction port 22... Discharge port 2; 3... Nozzle 24... Body of main pipe W... High pressure water F... Sludge applicant Sanko Co., Ltd. - No. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] A jet pump that is different from a main pipe having a straight suction port and a discharge port, and a plurality of nozzles for high-pressure water injection provided in the body near the suction port of the main pipe toward the discharge port side of the main pipe.