JPH1054394A - Self-priming pump cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abnormal noise generated when remained air is discharged by forming the cover of a self-priming pump on a rim which abuts on a separation plate formed in the vicinity of a root part arranged in proximity to an impeller bearing hole, in a straightening plate for separating in a steam separating chamber from water accumulating chamber in a non-shield state. SOLUTION: When a circulating pump is driven, pumping water passes a flow passage from an intake port 7 arranged on a cover 2 and a flow path 21, flow from the inner circumferential side of an impeller into a pump chamber, and forcibly fed in the radial direction by the impeller. The pumping water flows into a steam separating chamber 23 in a condition in which air is mixed, supplied to a wafer accumulating chamber 24 through a straightening plate 25, and discharged from a discharge port 8. In this case, a notch 26 is formed in the vicinity of a root part arranged in proximity to an impeller bearing hole 10' in a rim which abuts on a separation plate juxtaposed so as to abut on the opening rim of the cover 2. Remain air 27 in a water accumulating chamber 24 is discharged to the steam separating chamber 23 through the notch 26, and thereby, it is possible to ensure sufficient priming, and it is also possible to prevent abnormal noise to be generated by discharging remained air 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-priming pump, and more particularly to an improvement in a cover for realizing a self-priming pump with less noise and abnormal noise.

[0002]

2. Description of the Related Art FIG. 3 is a longitudinal sectional view of an example of a well-known circulating pump conventionally used. As shown in the figure, the pump includes a rotating machine 4-1 and a control circuit 4-2 for controlling the rotating machine inside a jacket 3, and also forms a front housing of the rotating machine 4-1. The casing 1 forms a pump chamber 9 together with a partition plate 6 provided at the opening end thereof, and houses the impeller 5 directly connected to the rotor of the rotating machine 4-1 in the pump chamber 9.

The cover 2, which is disposed so as to face the casing 1 forming the pump chamber 9 via the partition plate 6, includes a flow path 21, which is connected to the water intake 7, an air / water separation chamber 23, and a water storage chamber. 24 is formed, FIG. 4 is an internal front view of one example thereof, and FIG. 5 is a cross-sectional view of the example taken along line AA.

The operation of the circulation pump will be described with reference to FIGS. 3 and 4. Pumping is performed by using an intake port 7 provided on the cover 2.
Through the flow path 21 formed in the cover 2 and through the window A6-1 of the partition plate 6, from the inner peripheral side of the impeller 5 directly connected to the rotor of the rotating machine 4-1 from the pump chamber. 9 and is radially pumped by the impeller 5. The pumped water radially pumped by the impeller 5 inside the pump chamber 9 contains air, and the partition plate 6 is disturbed with the air mixed.
Flows into the steam-water separation chamber 23 through the window B6-2 of
A flow straightening plate 25 is provided for adjusting the flow and sending the flow to the sump chamber 24.

[0005] When operating as a self-priming pump, pumped water is sucked into the pump as priming water. This priming water is originally desirably retained in the water storage chamber 24 in a state where air is not mixed. However, it is difficult to completely eliminate the air inside the water / water separation chamber 23, and as shown in FIG. Residual air 26 remains in the portion interrupted by the current plate 25 of 24, and the amount of pumped water retained inside, which is primed due to the residual air, decreases, and this decrease impairs the function as a self-priming pump. Is well known.

In addition, as can be easily understood from FIG. 4, the retained residual air 26 is blocked by the rectifying plate 25 in the natural state, so that it is difficult to discharge to the outside even after the self-priming is completed. Although the gas is gradually discharged due to the fluctuation of the pressure at the time, abnormal noise is generated at the time of the discharge, and it has been desired to solve the problem in terms of the operating environment.

[0007]

In the conventional structure as described above, since it is difficult to discharge the residual air remaining inside the pump, the priming water required as a self-priming pump can be reduced,
The challenge was to eliminate the generation of abnormal noise when residual air was discharged due to pressure fluctuations during the continuous operation.

[0008]

SUMMARY OF THE INVENTION A cover of a self-priming pump according to the present invention is an impeller axle of a rectifying plate for non-shielding separation of a steam / water separation chamber and a water reservoir below the steam / water separation chamber. A notch is formed at an abutting edge of the partition near the root near the support hole so that the residual air in the water reservoir can pass through.

In the above-described configuration, the amount of residual air inside the pump, especially in the water reservoir, is reduced, and the noise generated when the residual air is gradually discharged due to the maximum amount of priming water and pressure fluctuations during the operation process. Can be eliminated.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an internal front view showing an embodiment of a cover according to the present invention, and FIG. 2 is a partial view taken along line BB of FIG.

As is apparent from FIGS. 4 and 5, a rectifying plate 25 for separating the air / water separation chamber 23 and the water storage chamber 24 in a non-shielding manner is the same as the prior art. However, a notch 26 is formed near the root portion near the impeller shaft support hole at the contact edge with the partition plate 6 provided so as to contact the opening edge of the cover 2. .

In the above-mentioned prior art configuration, the flow straightening plate 25 is provided only at the front end portion along the inner peripheral wall of the cover 2 and is provided in the steam-water separation chamber 2.
3 and the water reservoir 24 are formed so as to be able to circulate. In the present invention, a small notch 26 is provided near the root portion of the rectifying plate 25 near the impeller shaft support hole 10 'together with the tip portion of the rectifying plate 25. A flow passage is provided.

With such a configuration, the residual air 27 in the water reservoir 24 is discharged to the steam-water separation chamber 23 through the notch 26 located at a position higher than the end of the current plate 25, and as shown in FIG. As shown in the figure, the amount of residual air 27 in the water reservoir 24 becomes extremely small, it is possible to secure sufficient priming water, and it is possible to prevent generation of abnormal noise due to discharge of the residual air 27.

[0014]

The cover of the self-priming pump according to the present invention is
The effect of reducing the amount of residual air inside the pump, especially in the water storage chamber, and maximizing the amount of priming water and eliminating noise when the residual air is gradually discharged due to pressure fluctuations during the operation can be realized.

[Brief description of the drawings]

FIG. 1 is an internal front view of an example of a cover of a self-priming pump according to the present invention.

FIG. 2 is a sectional view taken along the line BB of the example of FIG.

FIG. 3 is a longitudinal sectional view of an example of a self-priming pump according to the present invention.

FIG. 4 is an internal front view of an example of a cover of a self-priming pump according to the related art.

FIG. 5 is a sectional view taken along the line AA of the example of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Cover 3 Jacket 4-1 Rotating machine 4-2 Control circuit 5 Impeller 6 Partition plate 6-1 Window A 6-2 Window B 7 Water intake 8 Discharge port 9 Pump room 10 Impeller support shaft 10 'Blade Axle support hole 20 Drain hole 21 Flow path 22 Partition wall 23 Air / water separation chamber 24 Water storage chamber 25 Rectifier plate 26 Notch 27 Residual air

Claims (1)

[Claims] 1. A rotating machine, an impeller connected and held to a rotor of the rotating machine, a casing accommodating the impeller and forming a pump chamber together with a partition plate, and the casing via the partition plate. A cover that is arranged to be opposed to the cover of the self-priming pump, a flow path connected to the water intake port, a gas-water separation chamber separated by the flow path and a partition wall, and a gas-water separation chamber. A water reservoir having a drain hole formed therein, which is non-shieldingly separated by a rectifying plate at a lower portion, wherein the rectifying plate separating the water reservoir has a partition plate near a root portion close to an impeller shaft support hole; A cover for a self-priming pump, characterized in that a notch is formed at the contact edge so that the residual air in the reservoir can pass through.