JPS6226634Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jet pump structure that has a simple structure, is easy to disassemble and assemble, and can be manufactured at low cost.

Since the jet pump is composed of a combination of a nozzle and a throat tube, it has the advantage that it does not cause problems when fine foreign matter such as sand gets mixed in.

However, the positional relationship between the nozzle and the throat tube requires precise dimensions, and since the nozzle and the throat tube are the portions with the largest pressure difference, great mounting strength is required.

For this reason, jet pumps have conventionally been provided with a water passage formed in a strong bracket and a nozzle and a throat tube screwed together.

For this reason, machining of the bracket is troublesome, and disassembly is extremely troublesome due to screwing.

That is, since the threaded state of the nozzle and the like is a part with a large difference in water pressure, it must be strongly tightened, which inevitably requires strong force for disassembly, which is not easy.

In addition, it is necessary to form the dimensions precisely, and the processing and assembly are troublesome, and disassembly is not easy.

On the other hand, since the performance of the nozzle is influenced by its water flow, attention must be paid to the gap between the nozzle and the throat tube and the machining accuracy, which has led to high prices.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a jet pump having a structure that is easy to process, disassemble and assemble, and can be constructed at a low cost.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is a vertical cross-sectional view of a main part of a jet pump according to an embodiment of the present invention, and Figs. 2 and 3 are: These are examples of nozzles made of steel plates.

In FIG. 1, the jet pump has a casing 2 of a centrifugal pump 1 having a suction port 3 and a jet water supply port 4, and a bracket 6 is fixed to the casing 2 with a packing 5 interposed therebetween.

The bracket 6 is configured to communicate with the suction port 3 of the casing 2 and the jet water supply port 4, and a throat tube 8 is provided on the suction port 3 side so as to face the impeller 7. There is.

Further, the throat tube 8 is provided with a nozzle 9 made of a steel plate interposed therebetween, and the nozzle 9 is fixed to the bracket 6 through the packing 5 in a watertight manner and is configured to communicate with the jet water inlet 4. has been done.

The throat tube 8 is fixed to the bracket 6 with bolts 10, and has a jet suction port 11 that communicates with the peripheral edge of the nozzle 9, and is configured to be connected to a pipe to a well (not shown). has been done.

In FIG. 2, the nozzle 9a is formed into a dish shape by drawing a steel plate, and is provided with three through holes 12 for bolts 10 for fixing it to the bracket 6. A jet acting portion 14 communicating with the jet suction port 11 is formed at the periphery of the jet.

The throat tube 8 is configured to press the through hole 12 with a bolt 10.

FIG. 3 shows another embodiment of the nozzle 9b, with two
Through-holes 12 for bolts are formed, and a portion 15 against which the throat tube 8 presses is formed on the outer periphery of a jet acting portion 14 formed at the periphery of the nozzle hole 13.

These nozzles 9, 9a, 9b are all made of a material with good corrosion resistance such as stainless steel.
The production consists of drawing in a press.

In such a configuration, the jet pump:
When the bracket 6 is removed, the bracket 6 to which the throat tube 8 is integrally fixed will be removed from the casing 2.

When the throat tube 8 is removed by removing the bolt 10 from the bracket 6, the nozzle 9, which is fixed with the packing 5 interposed, comes off.

That is, the nozzle 9 can be easily removed,
Moreover, since it is configured in a dish shape, in the unlikely event that the nozzle 9
It is extremely convenient for disassembling and cleaning when foreign objects become clogged.

Further, the nozzle 9 is configured to be pressed by the throat tube 8, and the positional relationship between the throat tube 8 and the nozzle 9, which is the most important problem in jet action, can be set very easily and accurately.

Therefore, unlike conventional jet pumps in which the throat tube and nozzle are attached and formed by screwing each other, the manufacturing quality is extremely stable, and the performance test after assembly can be confirmed by a simple test.

On the other hand, the machining of the bracket 6 that holds the nozzle 9 and the throat tube 8 eliminates the need for thread machining for threading these parts and only requires the machining of thin screw holes for the bolts 10, making it extremely convenient and inexpensive to manufacture. Become.

In particular, the machining part of the bracket 6 is extremely simple as it is only the flat part that the packing 5 comes into contact with, and it is easy to rationalize machining in mass production, etc., and it is inexpensive and has a great effect on stabilizing quality. .

Further, the nozzle 9 is fixed by arranging two to three bolts 10, except for the jet action part 14 on the periphery of the nozzle necessary for the jet action, as shown in FIGS. 2 and 3, respectively. It can be fixed sufficiently.

Of course, the nozzles 9, 9a, 9b are not limited to the structure of this embodiment, and may be of any structure as long as they are formed of a steel plate and can be press-fixed to the bracket 6 by the throat tube 8.

The nozzle 9 is configured so that the nozzle hole 13 is made of a beam and is dish-shaped so that it will not be deformed by the water flow pressurized from the jet water supply port 4, and even though it is made of a thin steel plate. It is durable regardless.

Since such a configuration can be formed at low cost, if some parts such as nozzles with different nozzle holes for shallow wells and deep wells are replaced and adopted for a jet pump that is used for both purposes, this replacement will eliminate unnecessary parts. The parts such as the nozzle used in the process are inexpensive, and economical effects can be obtained.

Of course, the bracket 6 may be arranged at the bottom of the well and connected to the casing 2 by piping, but the nozzle hole 13 of the nozzle 9 is originally different between a shallow well and a deep well. , this nozzle 9
Even if only one part is replaced, it can actually be done cheaply.

That is, the nozzle 9 is made of a steel plate with good corrosion resistance, such as stainless steel, and can be formed by drawing with a press, so it can be manufactured easily and at low cost.

Compared to a conventional nozzle that is screwed onto a bracket, such a nozzle not only does not have a threaded part, but also eliminates the need for mechanical cutting of curved parts around the nozzle hole 13 that cause jet action. This will greatly improve the rationalization of processing, and the effects will be extremely large.

In addition, in the embodiment shown in FIG. 1, the nozzle 9 of the bracket 6 and the throat tube 8
Since a fixing mechanism by screwing is not required, the axial dimension is shortened, and the entire jet pump can be made compact.

As explained above, according to the present invention, the nozzle is formed of a plate-shaped steel plate and is pressed and clamped by the throat tube, which simplifies the assembly structure, facilitates disassembly, and allows for inexpensive manufacture. The effects are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of a jet pump according to an embodiment of the present invention, and FIGS. 2 and 3 each show an embodiment of a nozzle made of a steel plate. 2... Casing, 3... Suction port, 4... Jet water inlet, 5... Packing, 6... Bracket, 8... Throat tube, 9... Nozzle.

Claims (1)

[Scope of utility model registration request] A bracket is provided that communicates with the suction port of the centrifugal pump and the jet water supply port, and a throat tube is fixed to the suction port side of the bracket with a nozzle made of a steel plate drawn into a dish shape interposed therebetween. jet pump.