JPH10227291A - Self-priming pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-priming pump which can shorten a self-priming time. SOLUTION: This self-priming pump is provided with a base plate in which a projection is formed on the center of a disc shape plate, a shroud formed plural notches on the outer periphery of the disc shape plate, provided a hole in the center of this disc and formed a cylindrical projection part from this hole, a close type impeller in which plural blades held between this shroud and base plate are integrally formed, a main body casing 11 for forming an eddy room 22 in which this impeller is stored, a water suction passage 15, a second casing 12 for forming a water send passage 16 used to a gas and water separating room commonly, a partition plate 13 installed between the main body casing 11 and second casing 12 and in which an opening hole is formed for flowing a water between the eddy room 22 and the suction water passage 15, and the eddy room 22 and the water send passage 16 and a motor 21 for driving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed impeller used in a self-priming pump.

[0002]

2. Description of the Related Art An example of a conventional closed-type impeller and a self-priming pump using the impeller are shown in FIGS. The configuration and operation of the pump will be described with reference to FIG.

FIG. 4 shows an impeller 1b attached to a conventional self-priming pump. The impeller 1b has a substrate 5 having a convex portion 7 formed at the center of a disk-shaped plate, and a central portion of a disk-shaped plate. And a plurality of blades 4 sandwiched between the shroud 2b and the substrate 5 are integrally formed to form a closed impeller 1b. Is composed.

FIG. 5 shows an example of a conventional self-priming pump.
It is an exploded perspective view. The components of the self-priming pump are roughly classified into a main body casing 11, a motor 21 fastened to the casing 11, a closed impeller 1b attached to a shaft of the motor 21, a water intake passage and a water supply passage. Formed on the second casing 12 and the casing 1
Partition plate 13 that separates 2 from main body casing 11
And packings 14 arranged on both sides of the partition plate 13, and are arranged as shown in FIG.

In such a configuration, when the pump is stopped, air often enters the hose connected to the water suction pipe 17, and under such circumstances, the impeller 1b is driven by the motor 21. Is rotated, the water in the swirl chamber 22 is stirred, and the water containing air is sent to the water supply passage 16. Then, water and air are separated at this point, and the air separated above the water is discharged to the outside together with the water from inside the pump. Due to this action, the pressure in the swirl chamber 22 decreases, and the water in the water suction passage 15 flows into the swirl chamber 22. In this manner, the air in the hose connected to the water suction pipe 17 is sucked into the vortex chamber 22, discharged to the outside from the discharge pipe 18 via the vortex chamber 22, and starts water supply.

[0006]

The closed impeller 1b of the conventional self-priming pump is difficult to form an air-water mixture in the eddy chamber during the self-priming operation, and as a result, the air-water mixture having a small mixing ratio of air. Therefore, there is a problem that the amount of air discharged is small and self-priming takes time.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a self-contained pump capable of shortening a self-priming time.

[0008]

Means for Solving the Problems A substrate in which a convex portion is formed in the center of a disk-shaped plate, and a plurality of notches are formed in the outer periphery of the disk-shaped plate, and a center is formed in the center of the disk. A closed impeller integrally formed with a shroud having a hole and forming a cylindrical protrusion from the hole, a plurality of blades sandwiched between the shroud and the substrate, and a vortex chamber accommodating the impeller , A water absorption passage, a second casing forming a water supply passage also serving as an air / water separation chamber, and a vortex chamber and a water absorption passage interposed between the main body casing and the second casing. And a self-priming pump comprising a partition plate having an opening hole for water to flow between the vortex chamber and the water supply passage, and a driving motor.

Alternatively, the present invention provides a self-priming pump having an impeller having a plurality of notches formed on the outer periphery of a substrate and the outer periphery of a shroud of the closed impeller. The proportion of air mixed in increases, the air discharge efficiency is improved, and the self-priming time is shortened, thereby solving the problem.

[0010]

By rotating an impeller provided with a plurality of notches on the outer peripheral portion of the shroud or an impeller provided with a plurality of notches on the outer peripheral portion of the substrate and the shroud, the agitation of water in the pump chamber is promoted. The formation of a water-water mixture during self-priming is facilitated and the proportion of air in the mixture is increased.

[0011] A centrifugal force acts on the air-water mixture to flow in the outer peripheral direction. By this action, the water and the air are sent to the water supply passage via the water supply hole and separated from the water, and the air separated above the water is discharged from the discharge pipe to the outside of the pump.

As a result, the water pressure near the center of the impeller 1 decreases, and water and air in the water suction passage enter the eddy chamber. And, as the water pressure in the water intake passage decreases,
Water and air in the hose on the water absorption pipe side flow into the water absorption passage.

By continuing this operation, the air in the hose is discharged to the outside via the inside of the pump. Water supply is started when the air in the hose runs out.

As described above, by forming the notch in the outer peripheral portion of the impeller, the mixing ratio of air into water increases,
The air in the hose is discharged in a short time, and the self-priming time is reduced.

[0015]

FIG. 1 is an exploded perspective view of a self-priming pump according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the self-priming pump according to the embodiment of the present invention. FIG. 3 is a perspective view of a closed-type impeller according to an example, and FIG. 3 is a cross-sectional view of the closed-type impeller according to an embodiment of the present invention, taken along line AA. Hereinafter, the configuration and operation will be described based on these drawings.

Reference numeral 1 denotes a closed impeller. The impeller 1 has a substrate 5 having a convex portion 7 formed in the center of a disk-shaped plate, and a plurality of notches 3 formed in the outer periphery of the disk-shaped plate. A shroud 1 having a hole and a cylindrical protrusion 6 formed from the hole, and a plurality of curved blades 4 sandwiched between the shroud 2 and the substrate 5 are integrally formed to form a closed impeller. 1.

Reference numeral 11 denotes a main body casing. An eddy chamber 22 is formed in the main body casing 11.
The back surface of the vortex chamber 22 is a motor mounting surface, and the motor 21 is fastened to this portion. And
The closed type impeller 1 is mounted on the shaft of the motor fastened to the casing 11.

Reference numeral 12 denotes a second casing. This casing 12 is partitioned into two rooms. One of the rooms is a water absorbing passage 15, and a water absorbing pipe 17 is formed at an end of the passage 15. The other room is a water passage 16. A discharge pipe 18 is formed at an end of the passage 16, and the water supply passage 16 also functions as a steam separation chamber.

Reference numeral 13 denotes a partition plate. This partition plate 13
A water absorption hole 19 is formed in the vicinity of a central portion of the partition plate 1 so that the vortex chamber 22 and the water absorption passage 15 communicate with each other.
A water supply hole 20 is formed near the end of 3 so that the vortex chamber 22 and the water supply passage 15 communicate with each other. The partition plate 13 is formed of a steel plate such as a stainless steel plate or a resin material.

Reference numeral 14 denotes a packing. The packing 14 has substantially the same shape as the partition plate 13, and a hole is formed at the same location as the partition plate 13. This packing 1
4 is formed of an elastic body.

Reference numeral 21 denotes a motor for driving the impeller 1.

Such components are fastened with screws to form a self-priming pump.

In such a configuration, when the pump is stopped, air is often contained in the hose connected to the water suction pipe 17. In such a situation, the motor is started and the impeller is started. 1, the rotation torque is transmitted, and the impeller 1 rotates. Due to the rotation of the impeller 1, centrifugal force is applied to the water in the swirl chamber 22 and the water flows in the outer peripheral direction. Water flows into the impeller 1 from the suction port 9 and is discharged from the impeller 1 from the discharge port 10 by centrifugal force. By this action, the water in the vortex chamber 22 is separated from the partition plate 1.
The water is sent to the water supply passage 16 via the water supply hole 20 provided in the apparatus 3. Water and air are separated in the water supply passage 16, and the air separated above the water is discharged out of the pump through a discharge pipe 18 together with a part of the water.

By this action, the water pressure in the vicinity of the center of the impeller 1 is reduced, and the water and air in the water absorption passage 15 are removed from the water absorption hole 19.
Through the swirl chamber 22 via Along with this,
The water pressure in the water absorption passage 15 decreases, and water and air in the hose on the water absorption pipe 17 side flow into the water absorption passage 15 via the pipe 17.

By continuously rotating the impeller 1 and continuing this operation, the air in the hose on the water absorption pipe 17 side is discharged to the outside from the discharge pipe 18 via the inside of the pump. Water supply is started when the air in the hose runs out.

As in the present invention, a closed impeller 1 having a plurality of notches formed on the outer periphery of a shroud 2 is provided.
By stirring the water in the vortex chamber 22, this notch 3
The formation of a water-water mixture is promoted in the section and the proportion of air in this mixture is increased. By sending this air-water mixture to the water supply passage 16 to separate the air and discharge it from the discharge pipe 18, the air in the hose is discharged in a short time, and the self-priming performance can be greatly improved. In addition, there is no change in pumping characteristics and noise.

Further, even in the case of an impeller having a plurality of cutouts formed on the outer periphery of the substrate and the outer periphery of the shroud 2, the formation of the air-water mixture can be promoted. Similar functions and effects can be obtained.

Although the shape of the notch is a semicircle in one embodiment, it is not limited to this shape.

The material of the closed impeller is generally a resin, but it is also possible to use an impeller using a brass material, a bronze material, an aluminum material or the like in addition to this material.

[0030]

As described above, the pump of the present invention has a plurality of notches formed on the outer periphery of the impeller to increase the proportion of air in the air-water mixture without changing pumping characteristics and noise. Self-priming time can be reduced.

[0031]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a self-priming pump according to an embodiment of the present invention.

FIG. 2 is a perspective view of a closed impeller according to an embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of the closed impeller according to one embodiment of the present invention.

FIG. 4 is a perspective view of a closed impeller of a conventional self-priming pump.

FIG. 5 is an exploded perspective view of a conventional self-priming pump.

[Explanation of symbols]

 1, 1b ··· Closed impeller 2, 2b ··· Shroud 3 ··· Notch 4 ·················· Board 6 ····· Cylindrical projection 7 ··· ··· Convex portion 8 ···· Outer peripheral portion 9 ··· Suction port 10 ··· · Discharge port 11 ··· Main body casing 12 ··· Second casing 13 ··· · Divider 14 ··· Rubber packing 15 · · · Water absorption passage 16 · · · Water supply passage 17 · · · Water absorption pipe 18 · · · Water supply pipe 19 · · · Water absorption Hole 20 Water supply hole 21 Motor 22 Eddy chamber

Claims (2)

[Claims] 1. A substrate in which a convex portion is formed in the center of a disk-shaped plate, and a plurality of notches are formed in the outer periphery of the disk-shaped plate, and a hole is provided in the center of the disk. A closed impeller integrally formed with a shroud having a cylindrical protrusion from the hole, a plurality of blades sandwiched between the shroud and the substrate, and a vortex chamber for accommodating the impeller A second casing forming a main body casing, a water absorption passage, and a water supply passage also serving as an air / water separation chamber; a second casing interposed between the main body casing and the second casing; and the vortex chamber and the water absorption passage; A self-priming pump comprising: a partition plate having an opening for water and a flow passage formed between the vortex chamber and the water supply passage; and a driving motor. 2. A substrate having a plurality of notches formed on the outer periphery of a disk-shaped plate and a projection formed at a central portion, and a plurality of notches formed on an outer periphery of the disk-shaped plate. 2. A closed impeller wherein a shroud having a hole formed in a center portion of a plate and having a cylindrical projection formed from the hole, and a plurality of blades sandwiched between the shroud and the substrate are integrally formed. A self-priming pump that is mounted on a pump.