JPS643836Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a self-priming pump with improved self-priming performance.

(b) Prior Art The prior art described in Japanese Utility Model Application Publication No. 103395/1987, which precedes the present invention, will be explained with reference to FIGS. 7 to 12. Reference numeral 1 denotes a pressure tank, a motor 2 is mounted on the tank, and a Wesco pump 3 is attached to one side of the motor. The Wesco pump consists of a rotary disk 5 which forms an impeller 4 on its periphery and is driven by the motor 2, and a casing 6, and a water suction pipe 8 is connected to the suction port 7 of the casing. are doing. The water suction pipe is provided with a check valve 9 at its upper end, and its lower end is connected to the upper end of a pipe 10. This pipe 10 passes into the pressure tank 1, and has both upper and lower ends protruding from the upper and peripheral surfaces of the pressure tank, respectively. Further, a self-priming tank 12 is provided at the discharge port 11 of the casing.
The inlet 12a is connected to the inlet 12a. A self-priming water supply port and a stopper 13 for blocking the self-priming water supply port are provided on the upper surface of this self-priming tank, and a vertically disposed baffle plate 14 is provided, and a pressure feed pipe 15 is vertically disposed from one side through this buffle plate. There is. The upper end of this pressure feed pipe is the self-priming tank 1
2 and the lower end 16 projects into the pressure tank 1 .

Reference numeral 18 denotes a resistance plate attached to the discharge port 11, which is specifically made of a metal lath plate, and its mesh 19 is inclined in the opposite direction to the pressure feed pipe 15. Therefore, the water vigorously discharged from the discharge port 11 hits this resistance plate 18 and is separated from water and air, and the water from which air has been separated passes through the inclined mesh 1.
9... and rises in the opposite direction to the pressure feed pipe 15. As a result, only air is discharged through the pressure feed pipe 15, but water is difficult to enter into the pressure feed pipe 15.
Coupled with the action of the baffle plate 14, only water returns from the discharge port 11 into the casing 6 and performs self-priming.
Therefore, water shortage during self-priming is reduced, and self-priming time can be shortened.

In addition, when assembling, the meshes 19, 19 of the resistance plate...
One corner 20 of the quadrilateral-shaped resistance plate 18 is cut out diagonally so that the inclination direction of the... This resistance plate 18 is fitted into the edge step 22.

Reference numeral 23 denotes a packing that prevents water leakage from the connecting portion between the casing 6 and the self-priming tank 12, and a stepped portion 24 formed on the rectangular opening edge of this packing.
The resistance plate 18 may be fitted to the holder. In this case as well, in order to prevent the mounting direction of the resistance plate 18 from being mistaken, one corner 25 of the rectangular opening of the packing 23 is made oblique so that they cannot be fitted together if the directions are different. .

However, in the conventional example, the lath-like resistance plate 1
When attaching No. 8 to the pump, care must be taken not to make a mistake in the direction of the mesh. In order to supplement the strength of the lath plate 18, it is necessary to sandwich the lath plate 18 in the shape of a sandwich with packing 23 or the like. Therefore, the structure becomes complicated,
There were drawbacks such as the installation work of the resistance plate 18 becoming troublesome.

(c) Problems to be solved by the invention The present invention solves the above-mentioned drawbacks and improves self-priming performance.

(d) Means for solving the problem The present invention integrally molds a resistance plate on the inner wall of the self-priming tank on the leading side of rotation of the impeller, and also attaches this resistance plate in the direction approaching the inlet of the self-priming tank. It is tilted.

(E) Effect According to the present invention, the inflow water of the self-priming tank is held by the inclined resistance plate, and the flow direction and flow velocity are efficiently adjusted.

Furthermore, since the resistance plate is integrally molded on the inner wall of the self-priming tank, it can be easily constructed without increasing costs, unlike a resistor plate that is integrally molded on the impeller housing casing made of expensive material.

(F) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4, and only the main parts will be described, and the other parts will be designated by the same reference numerals as those of the conventional example and the explanation thereof will be omitted.

Reference numeral 26 denotes a resistance plate that is cast integrally with the self-priming tank 27, and its two adjacent sides are fused with the self-priming tank 27 and are inclined in the direction approaching the inlet 27a of the self-priming tank 27. The resistance plate 26 is connected to the inlet 27 on the inner wall 27b of the self-priming tank on the leading side of the rotation of the impeller 4.
It is provided in the form of a small piece that only partially blocks part a. The smaller the resistor plate 26 is, the smaller its molten metal injection hole and mold will be, and the material for its own formation and mold material can be saved.

The self-priming tank 27 also has an inlet 27 at its lower end.
a and provided at the upper part of the casing 6, the water inside the casing 6 is sequentially transferred to the discharge port 11 of the casing 6, the self-priming tank inner wall 27b on the leading side of rotation of the impeller 5, and other self-priming tank inner walls. The self-priming tank 27 is configured to be discharged along the line 27c.

In the self-priming pump, the water flowing into the self-priming tank 27 collides with the resistance plate 26 and is forcibly changed direction toward the proximal end of the resistance plate 26 due to the acute inclination angle θ of the resistance plate 26, and flows into the corner portion. The collision causes steam and water separation, and at the same time, it is possible to prevent a direct high-speed flow toward the compressed pressure pipe 15 side compressed at the corner portion. Furthermore, since the inlet 27a is only partially blocked, there is no deterioration in pump performance or insufficient water volume during normal operation after self-priming, and residual air in the self-priming tank 27 also flows upward smoothly.

5 and 6 show other embodiments, in which the resistance plate 2
8 is bent in the direction approaching the inlet 27a to make it easier to hold inflow water and increase the resistance to blocking direct high-speed flow, making it possible to reduce the size of the resistance plate 28 by that much. . Specifically, one side A of the inlet 27a is 42 mm, the other side B is 52 mm, the thickness of the resistance plate 28 is 3 mm, the width C is 14 mm, and the length of the base is D.
is set to 34 mm, the length E of the tip is set to 8 mm, and the angle θ is set to approximately 70 degrees.

(g) Effects of the invention Since the invention is constructed as described above, the inflow water from the self-priming tank is held by the resistance plate, and the direction is changed and decelerated efficiently to prevent leakage from the self-priming tank. The self-priming performance can be improved, and the self-priming performance can be improved only by using a resistor plate whose shape and forming work are simple.

In addition, the casing for housing the impeller is generally made of an expensive rust-resistant material such as gunmetal in order to maintain a highly accurate water flow gap between the impeller and the impeller, which affects pump performance, and the resistance plate is integrated into this expensive material. If the resistor plate were molded, the material cost would increase due to the addition of the resistor plate, but in this invention, the resistor plate is integrally molded into the self-priming tank, avoiding the casing, which is an expensive element. Since it is made of an inexpensive material such as cast iron and does not require any mounting means, it can be easily installed in a self-priming pump.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
Figure 1 is a vertical front view, Figure 2 is a vertical side view, and Figure 3 is a vertical front view.
The figure is a bottom view of the main part, FIG. 4 is a diagram explaining the operation, FIGS. 5 and 6 show other embodiments, FIG. Figures 7 to 12
The figures show a conventional example, where Fig. 7 is a vertical front view, Fig. 8 is a longitudinal side view, Fig. 9 is a plan view of the resistance plate, and Fig. 10 is a longitudinal sectional front view.
The drawings are a cross-sectional view taken from FIG. 9, FIG. 11 is a plan view of the pump discharge port, and FIG. 12 is a plan view of the packing. 4... Impeller, 6... Casing, 11...
Discharge port, 27... Self-priming tank, 27a... Inflow port, 27b... Self-priming tank inner wall, 26, 28...
resistance plate.

Claims (1)

[Scope of utility model registration request] An inlet is provided at the lower end of a self-priming tank, and this self-priming tank is provided at the upper part of a casing housing an impeller, and as the impeller rotates, fluid inside the casing is sequentially supplied to a discharge port of the casing,
In a self-priming pump in which the inlet is discharged to the outside of the self-priming tank along the inner wall of the self-priming tank on the leading side of rotation of the impeller, the inlet is close to the inner wall of the self-priming tank. A self-priming pump characterized by an integrally molded resistance plate tilted in the direction of