JPH0112000Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a jet pump whose nozzle is formed of a steel plate to simplify the structure.

A jet pump is equipped with a nozzle, and uses negative pressure obtained by jet action generated by jetting high-pressure water from the nozzle to suck and pump water.

For this reason, the nozzle is an important part, and in addition to mechanical strength issues, there are also issues such as the need to improve the efficiency of water pumping.

For this reason, conventional nozzles have been formed by machining gunmetal, etc., and have been screwed onto the jet body.

This structure provided sufficient mechanical strength and watertightness, but it required time and effort to process, was unsuitable for mass production, and had the disadvantages of being expensive. Ta.

Of course, attempts have been made to form the nozzle with a resin molded product, but there is a problem that if sand gets mixed into the pumped water, it will cause wear and change in characteristics.
The problem was that when abnormally hot water flows due to dry running, it would deform and its characteristics would change.

Therefore, attempts have been made to form the nozzle by drawing a steel plate, but although this solves the conventional problems, it is difficult to ensure watertightness because it is impossible to form a screw for screwing into the jet body. Ta.

In particular, in the drawing process of steel plates, there has been a problem in that wrinkles are formed on the peripheral edge portion, ie, the flange portion, for drawing out the protruding portion of the nozzle.

Since the nozzle itself is formed into a small size even in the case of a fairly large jet pump, it is actually difficult to draw the nozzle to the point where wrinkles are eliminated.

Moreover, the nozzle requires a through hole on the periphery of the nozzle that communicates with the water absorption side so that water can be efficiently absorbed by the jet action generated by the high-pressure water jetted from the nozzle, and if the nozzle is made of a steel plate, it will be stronger. As a result, it was difficult to ensure watertightness.

The present invention was developed in view of the above circumstances, and aims to provide a jet pump that can effectively prevent water leakage when the nozzle is constructed of a steel plate and can be constructed without deteriorating efficiency. .

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is an exploded perspective view of the main parts of a jet pump according to an embodiment of the invention, and Fig. 2 is an exploded perspective view of the main parts. , is an enlarged plan view of packing.

FIG. 3 is a longitudinal sectional view of the main part showing the assembled state.

In FIG. 1, the jet pump has a jet body 1 forming the water suction side, which is made of cast metal, and has an open elliptical groove 2 formed therein.
At the end of this groove 2, a mounting portion 4 for a disc-shaped steel plate 3 is formed.

A stepped portion is formed in the mounting portion 4 of the disc-shaped steel plate 3 of the body 1 so that a C-shaped packing 5 is interposed therebetween.
A disc-shaped steel plate 3 is attached to the jet body 1 with the disc-shaped steel plate 3 interposed therebetween.

Further, the disc-shaped steel plate 3 is formed by drawing and forming a steel plate, and is made of a material with excellent corrosion resistance such as a general stainless steel plate. The disc-shaped steel plate 3 is provided with a nozzle 6 protruding from the center of the small disc-shaped steel plate 3 for spraying high-pressure water.

The disc-shaped steel plate 3 is divided into three equal parts in the circumferential direction around the nozzle at the periphery of the nozzle 6, and water absorption through holes 7 are formed in the two equal parts, and the remaining one part is divided into three equal parts. A flat part 8 is disposed on the holder, and a bolt hole 9 for fixing is formed in the flat part 8.

In FIG. 2, the packing 5 is formed in a C-shape, and a through hole 10 in the packing is formed at a position corresponding to the water absorption hole 7 in the disc-shaped steel plate 3. A rib 11 is formed around the periphery of the plate 10 .

A portion of the disc-shaped steel plate 3 that corresponds to the flat part 8 and the nozzle 6 is removed to form a C-shape, and a bolt hole 12 is formed facing the disc-shaped steel plate 3.

In FIG. 3, the jet pump has a disc-shaped steel plate 3 attached to a jet body 1 through a packing 5, and an elliptical groove 2 communicates with a nozzle 6 through the jet body 1 side of the disc-shaped steel plate 3. The jet body 1 has a suction channel 14.
is formed and is configured to communicate with the ventilate tube 15 via through holes 7 and 10 in the packing.

In such a configuration, when the disk-shaped steel plate 3 is attached to the jet body 1 with the packing 5 interposed, the jet pump has a groove 2 in the jet body 1.
High-pressure water can be sent from the nozzle 6 of the disc-shaped steel plate 3, negative pressure is generated around the nozzle 3, a jet action is produced, and water can be absorbed from the suction channel 14.

A ventilator tube 13 is provided in the injection direction of the nozzle 6, as shown in FIG.
Although not shown in the drawings, the ventilary tube 13 is connected to the suction side of a centrifugal pump, and the discharge pressure water of the centrifugal pump is communicated to the groove 2, so that high-pressure water is continuously injected from the nozzle 3. It is structured as follows.

Since the packing 5 has a rib 11 formed along the periphery of the water absorption through hole 7 of the disc-shaped steel plate 3, even if the disc-shaped steel plate 3 has a relatively bendable structure formed of a steel plate. Or even if wrinkles are formed on the periphery, water leakage can be effectively prevented by the pressing action of the ribs 11.

The packing 5 is formed in a C shape, and the part facing the flat part 8 of the disc-shaped steel plate 3 is removed. It is attached so that only the packing 8 is covered, and the packing 5 does not protrude into the groove 2.

Further, slight deformation that causes water leakage, such as wrinkles that occur in the disc-shaped steel plate 3 during drawing, is absorbed by the packing 5, particularly the ribs 11, and water leakage can be prevented.

Such ribs 11 of the packing 5 are not necessarily necessary, and may be used as long as the water pressure acting on the nozzle 6 is low or the packing 5 has sufficient elasticity to sufficiently absorb the wrinkles of the steel plate 3. .

As shown in Fig. 3, such a jet pump may be constructed by attaching a ventilary pipe 13 etc. to the jet body 1, but it is also possible to construct a jet pump by attaching a ventilary pipe 13 etc. to the jet body 1. It is also possible to attach the jet body directly to the centrifugal pump.

As explained above, according to the present invention, a flat part that forms a water channel to the nozzle is provided in a disc-shaped steel plate formed of a steel plate, together with a through hole and a groove that communicate with the suction channel, and the periphery of the through hole By attaching the jet pump to the jet body with a packing provided with ribs interposed therebetween, it is possible to obtain a jet pump that does not leak water and can be constructed and manufactured at low cost, and its practical value is great.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the main parts of a jet pump according to an embodiment of the present invention;
The figure is an enlarged plan view of packing. FIG. 3 is a longitudinal sectional view of the main part showing the assembled state. 1...Jet body, 3...Disc-shaped steel plate,
5...Packing, 6...Nozzle, 7,10...
Packing hole.

Claims (1)

[Scope of utility model registration request] In a jet pump configured to inject high-pressure water from a nozzle into a ventilate pipe, the nozzle is drawn in the center of a disc-shaped steel plate, and the area around the nozzle is divided into three equal parts in the circumferential direction around the nozzle.
A through hole for water absorption is formed in two equal parts, a flat part is formed in one equal part, a through hole for packing is provided that corresponds to the through hole for water absorption, and a part that corresponds to the flat part and the nozzle is provided. A packing is removed and formed into a C shape, and the steel plate is provided on the jet body with the packing interposed between the packing and the jet body so that the through holes in the packing coincide with the water absorption holes. A jet pump characterized in that a groove is formed which communicates a suction channel with a portion of the jet body that communicates with the water suction hole and communicates with the nozzle through the jet body side of the plane portion.