JPS5932678B2 - Pump priming port structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a spout structure of a pump.

For example, in a Hugal jet pump, a discharge pipe is installed vertically from the water retention tank of the pump body to the lower pressure tank, and the water retention tank and the discharge pipe are integrally formed by casting. A priming port is provided for the pump body, piping, etc., but if the priming port is located just above the discharge pipe, all the priming water will enter the discharge pipe and flow into the pressure tank, causing damage to the pump body, piping, etc. Therefore, the priming port is always provided at a position offset from the upper position of the discharge pipe.

In particular, when the discharge pipe and water holding tank are integrally formed by casting, the core of the discharge pipe becomes long, so a core support is required to stabilize it. It would be good if the hole for casting the discharge pipe could be used as a priming port, but as mentioned above, it is not possible to provide a priming port above the discharge pipe, so a separate hole should be made. The priming port is formed by drilling a priming hole, and the hole that is inevitably created by casting the bleed pipe and water holding tank must be plugged with a blind plug, which is time consuming and troublesome. Ta.

Note that if the discharge pipe and water retention tank are cast separately and welded, the holes for casting the discharge pipe cannot be made in the water retention tank as described above, but the number of man-hours required to weld the water retention tank and discharge pipe increases. , the cost was higher than in the above case.

Therefore, in general, the discharge pipe and the water holding tank are integrally formed by casting, which inevitably causes the above-mentioned problems.Furthermore, in the case of the Wesco pump, the water holding tank ( Since the auxiliary tank (generally called the auxiliary tank, but here called the water holding tank) and the discharge pipe that hangs down into the lower pressure tank are integrally formed by casting, the same problem as above occurred.

The present invention overcomes the above-mentioned conventional drawbacks and inconveniences, and
By integrally forming the water holding tank and the discharge pipe by casting, a priming port can be installed using the hole for casting the discharge pipe located above the discharge pipe, and a priming guide can be used to draw water into the discharge pipe. This prevents water from flowing into it.

Examples thereof will be described below with reference to the drawings.

In Figures 1 to 4, 1 is the water retention tank of the pump body;
2 is a pressure tank; 3 is a discharge pipe vertically installed from inside the water holding tank 1 to the lower pressure tank 2; this discharge pipe 3 and the water holding tank 1 are integrally formed by casting.

above the discharge pipe 3 of the water holding tank 1 and the discharge pipe 3
A hole for casting the discharge pipe formed at a position vertically communicating with the discharge pipe, that is, a hole created for supporting the core of the discharge pipe 3 during casting and for removing the core, is used as the priming port 4. .

Reference numeral 5 denotes a priming guide having a cylindrical shape with a bottom, an opening 6 in a part of the peripheral wall, and a flange 7 at the upper end. A collar 7 is engaged with a seat part 8 at the lower part of the inner periphery and is removably mounted to prevent priming water from flowing into the discharge pipe 3 below.

The opening 6 in the circumferential wall of the priming guide 50 is not limited in its opening angle, number, etc., as long as it is formed avoiding the wall side of the water holding tank 1 adjacent to the discharge pipe 3.

Furthermore, a vertical groove is formed at a proper location of the priming port 40 and the seat part 8, and a through hole is formed in the collar 7 of the priming id 5, so that the vertical groove and the through hole are aligned. The priming guide 5 is fitted and attached to the priming port 4, and an air vent hole 9 for priming is formed outside the priming guide 50 passage 10.

There may be a plurality of air vent holes 9.

11 is a priming cap screwed onto the inner periphery of the priming port 4; 12
is the backing.

In addition, in FIG. 5, a priming guide 5 is fixed to the inner periphery of the priming port 4, and air is vented to the outside of the passage 10 by the vertical groove formed on the inner periphery of the priming port 4 and the outer periphery of the priming guide 5. This shows the case where hole 9 is formed, and priming cap 1 is shown.
1 is screwed onto the outside of the priming port 4, and the backing 12 closes the air vent hole 9.

In FIG. 6, the priming guide 5 is formed of a flexible pipe, and is made long so that its lower end is located below the upper end of the discharge pipe 3, and the lower end is extended outside the discharge pipe 3. , priming water is prevented from entering the discharge pipe 3.

FIG. 7 shows a case where the priming guide 5 is screwed onto the inner periphery of the priming hole 4, and the priming cap 11 is further screwed onto the inner periphery of the priming guide 5. An air vent hole 9 is formed by the vertical groove formed on the inner periphery of the priming guide 4 and the outer periphery of the priming guide 5, and the air vent hole 9 is closed with a backing 12 except during priming.

In addition, in the present invention, the priming guide 5 can be formed of a backing material and used as a backing material (not shown).
Various implementations are possible without being limited to the examples.

The present invention is configured as described above, and the priming water is primed with the priming cap 11 and the backing 12 removed, and the priming water passes through the priming guide 50 passage 10 to the discharge pipe 3.
Despite having the priming port 4 above the discharge pipe 3, the priming water can flow into the pump body and piping without fear of flowing into the pressure tank 2. It is.

Moreover, by forming the air vent hole 9 around the hollow part 100 of the priming guide 5, the air in the pump body and piping is removed from the air vent hole 9 other than the passage 10 by the inflow of priming water.
There is no risk that the priming will be disturbed even if the air is discharged.

As described above, the present invention prevents priming water from flowing into the discharge pipe by the priming guide even though the priming port is located above the discharge pipe. The hole for casting the discharge pipe that is formed vertically above the discharge pipe can be used as a priming port without any problem, and there is no need to form a hole for the water spout separately as in the past. There is no need to plug the holes with blind plugs, making casting and processing easier, reducing manufacturing costs and making it possible to manufacture at low cost.

In addition, by providing the air vent hole around the priming guide, the air vent hole can be closed with the priming cap, which has the effect of making manufacturing easier.

Therefore, the present invention is an invention that can exhibit excellent effects that have not been seen before as a spout structure for a Hugal jet pump or a Wesco pump.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and FIG. 1 is a schematic front view of the Hugar jet pump, FIG. 2 is an enlarged sectional view of the main part, FIG. 3 is a sectional view during priming, and FIG. Figure 4 is Figure 2 IV
5 to 7 are sectional views taken along line -IV, respectively, showing different embodiments.

Claims (1)

[Claims] 1. In a pump in which the discharge pipe is vertically installed from the inside of the water retention tank of the pump body to the lower pressure tank, and the water retention tank and the discharge pipe are integrally formed by casting, the upper position of the discharge pipe of the water retention tank. A pump characterized in that a hole for casting a discharge pipe provided in the O is used as a priming port, and a guide having an opening formed therein is inserted into the priming port to prevent priming water from flowing into the discharge pipe below. Hood water mouth structure.