JPH05302587A - Impeller pump - Google Patents

Abstract

PURPOSE:To prevent decrease of ability to supply hot water due to generating bubbles by eccentrically placing a suction port, provided in the vicinity of the rotational axial line of an impeller arranged in a pump chamber, relating to a rotary shaft. CONSTITUTION:When a magnet 9 is driven by magnetic coupling of a drive magnet 10 rotated by a motor 35, an impeller 8 integrally formed with this magnet 9 is rotated to suck liquid in a vessel 20 from a suction port 12 supplied through a delivery port 13. Here, by eccentrically placing the suction port 12 relating to a rotary shaft 5 of the impeller 8, a flow of the liquid in the suction port 12 by rotating the impeller is delayed in a point A or the like separated from the rotary shaft 5. Accordingly, bubbles in a pump chamber 3 of rising by buoyancy are moved to the vessel 20 in the vicinity of the point A where is generated a small flow speed. In this way, ability to supply hot water is prevented from decreasing due to impeding a flow of the liquid by concentrating bubbles in the suction port 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller pump used for supplying hot water in a hot water supply device or the like.

[0002]

2. Description of the Related Art In water heaters such as jars and pots,
The impeller pump used for supplying hot water is used by forming a hole in the bottom of the container 20 of the water heater as shown in FIG. 3 and connecting the suction port of the pump to this. That is, in the drawing, 21 is a case of the pump, 22 is a partition plate that airtightly separates the pump chamber 23 and the drive unit 24, and 25 is the support member 2.
6 is a shaft supported by 6, 27 is a fixed member of an impeller and a magnet rotatably provided with respect to the shaft 15, 28 is an impeller that rotates integrally with the fixed member 27,
Reference numeral 29 denotes a driven magnet which rotates integrally with the fixed member 27, and is arranged in the pump chamber 23 so far. A drive magnet 30 is provided in the drive unit 24 and is rotated by a motor 31.

In such a pump, the driving magnet 30 is rotated by driving the motor 31, and the driven magnet 29 is rotated by magnetic coupling between the driving magnet 30 and the driven magnet 29, whereby the impeller 2 is rotated.
8 rotates and works as a pump. By the action of this pump, the hot water in the container 20 is sucked, sucked through the suction port 32, discharged through the discharge port 33, and supplied.

[0004]

Bubbles are generated when hot water is supplied by such a pump. In particular, the air pressure near the center of rotation of the impeller 28 is lower than that in the other areas, and the generated bubbles collect here, which blocks the suction port 32 and makes it difficult for the hot water to flow. is there.

An object of the present invention is to provide an impeller pump in which the hot water supply capacity does not deteriorate due to the generation of bubbles as described above.

[0006]

According to the impeller pump of the present invention, the suction port provided near the rotation axis of the impeller rotatably arranged in the pump chamber is eccentric to the rotation axis of the impeller. In this way, the flow for suction at a position distant from the axis of rotation at the suction port is delayed, and the bubbles generated in the pump chamber are allowed to escape into the container so that there is no bubble in the pump chamber, especially at the suction port. It prevents the decline of ability.

Further, by providing an asymmetrical straightening wall in the eccentric suction port, a portion in which the velocity of the liquid passing through the suction port becomes slower is created, whereby bubbles generated in the pump chamber can be more easily generated in the container. I was able to escape to.

[0008]

Embodiments of the impeller pump of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of an impeller pump according to the present invention. (A) is a sectional view, (B) is a BB line in (A).
FIG. In these figures, 1 is a case, 2 is a partition plate that airtightly separates the pump chamber 3 and the drive unit 4, 5 is a rotating shaft of an impeller, 7 is a fixing member, 8 is an impeller,
Reference numeral 9 is a driven magnet, and 10 is a driving magnet, which is rotated by a motor 35. Due to the rotation of the drive magnet 10, the magnet 9 is rotated by magnetic coupling, and the impeller is rotated integrally with the magnet 9 to perform a pump action. That is, the impeller pump is formed by the above configuration.
Such an impeller pump is arranged at the bottom of the container 20 and sucks the liquid (hot water) in the container from the suction port 12 and discharges it from the discharge port 13 to be supplied through a pipe.

As in this embodiment, by making the suction port 12 eccentric with respect to the rotation axis of the impeller 8, the liquid flow in the suction port due to the rotation of the impeller is separated from the rotation axis of the impeller by A. It becomes late at the point etc.

Therefore, the bubbles rising in the pump chamber due to the buoyancy rise in the vicinity of A where the flow velocity is small and move to the container.

As described above, according to the impeller pump of the first embodiment of the present invention, bubbles do not collect in the inflow port 12 and obstruct the flow of the liquid, so that the hot water supply capability is not lowered.

In the first embodiment, the position of the support plate 14 is not limited to the illustrated position. In other words, the structure shown in the drawing has a configuration in which the rotary shaft 5 and the outer wall 15 of the suction port 12 are radially extended from the rotary shaft 5 in a direction in which the rotary shaft 5 and the outer wall 15 of the suction port 12 are closest to each other and at the same angle from the position. Without changing the direction, each support plate 14 may be arranged in the right or left direction with a certain angle offset.

FIG. 2 is a diagram showing only the portion of the suction port of the second embodiment. This embodiment is the same as the first embodiment in that the suction port 12 is eccentric with respect to the rotating shaft 5 of the impeller 8 of the impeller pump. However, this is different from the first embodiment in that a rectifying wall 16 which is asymmetric with respect to the rotational axis direction of the impeller extending from the wall surface 15 of the eccentric suction port 12 is provided. By providing the straightening wall 16 which is asymmetric with respect to the rotation direction of the impeller, for example, a portion of the straightening wall 16 on the side opposite to the rotating shaft 5 and its vicinity have a portion whose flow velocity is lower than that of the liquid to be sucked. Bubbles generated in the pump chamber are generated in the container 20.
It becomes easier to escape to the side of, and it is possible to remove adverse effects such as a decrease in the amount of liquid supplied due to bubbles.

The length of the straightening wall 16 may be slightly longer or shorter than that shown in the figure. Further, in the illustrated embodiment, the flow regulating wall 16 has an arc shape extending in the clockwise direction in the drawing, but may have an arc shape extending in the counterclockwise direction from the lower wall surface in the drawing of the suction port 12.

In each of the embodiments described above, the motor 3 is used.
The drive magnet 10 is rotated by the rotation of 5, and the driven magnet is rotated by this rotation to rotate the impeller. The impeller pump is operated by utilizing magnetic coupling. However, the drive magnet is replaced by a coil and a commutator. The present invention can be applied to an impeller pump of an operating system in which a driven magnet is rotated by a driving unit that is a combination of the following. Further, an impeller pump of another operating method may be used.

That is, any type of impeller pump is
Since the flow of the liquid flowing through the suction port due to the generation of air bubbles will be hindered, it is possible to eliminate the above-mentioned drawbacks by applying the present invention.

[0018]

INDUSTRIAL APPLICABILITY The impeller pump of the present invention has a very simple structure in which the suction port is eccentric with respect to the rotary shaft of the impeller, and can escape bubbles generated to prevent a decrease in hot water supply capacity. is there.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of a second embodiment of the present invention.

FIG. 3 is a sectional view of a conventional impeller pump.

[Explanation of symbols]

 5 Rotating shaft of impeller 8 Impeller 12 Suction port 14 Support plate 15 Outer wall 16 Straightening wall

Claims (2)

[Claims] 1. A pump for supplying liquid by sucking from a suction port and discharging from a discharge port arranged near the center of the pump chamber by rotation of an impeller rotatably provided in the pump chamber. An impeller pump characterized by being eccentric with respect to the rotating shaft of the. 2. The impeller pump according to claim 1, wherein a straightening wall that is asymmetric with respect to a rotation direction of the impeller is provided in the suction port.