JP2596478Y2 - Centrifugal pump for hot water supply - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal pump for hot water supply, and more particularly to a centrifugal pump for hot water supply capable of reducing the size of an impeller chamber.

[0002]

2. Description of the Related Art Conventionally, in a centrifugal pump for hot water supply, for example,
As shown in FIG. 6, the impeller-side case 1 and the drive-side case 2 are joined and integrated via a partition wall 3 to form an impeller chamber 4 and a drive chamber 5, and inside the impeller chamber 4,
It is known that an impeller 7 containing a magnet 6 is rotatably housed therein, while a magnet 9 fixed to a main shaft 8a of a motor 8 is housed in the drive chamber 5 (Japanese Patent Laid-Open No. 62-1982).
No. 92114).

[0003] The centrifugal pump for hot water supply is provided laterally below a liquid container in a hot water supply device, for example, an electric pot in order to reduce the space occupied in the vertical direction. Contactlessly through the impeller 7
Of the impeller chamber 4 by the blades 7a of the impeller 7.
, So that the liquid can be discharged to the outside.

[0004]

However, in the conventional hot water supply centrifugal pump, the impeller 7 housed in the impeller chamber 4 has an outer diameter of 29 to 30 mm. In addition, even if the water heater is disposed horizontally below the water heater, a useless space is formed in a portion other than the centrifugal pump, and the water heater must be enlarged in the height direction or the liquid container must be downsized. There was a problem.

The impeller 7 has a ratio of the height dimension of the blade 7a to the outer diameter (height dimension of the blade 7a / outer diameter) of 0.19.
Therefore, there is a problem that a load applied to the motor 8 is large and a sufficient discharge flow rate cannot be obtained for power consumption. In view of the above problems, it is an object of the present invention to provide a centrifugal pump for hot water supply in which an impeller chamber can be reduced in size and consumes less power.

[0006]

According to the present invention, in order to achieve the above object, an impeller-side case and a drive-side case are connected and integrated via a partition, and the impeller is rotatably housed in the impeller-side case. A hot water supply centrifugal pump in which a drive unit of a motor is provided in the drive side case, and a magnetic coupling unit is provided in each of the impeller and the drive unit, wherein the impeller has an outer diameter of 24 mm or less, and While the ratio of the height to the outer diameter is 0.29 to 0.35,
The impeller chamber is formed according to the shape of the impeller.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front sectional view of a hot water supply centrifugal pump according to the present embodiment, and FIG. 2 is an exploded perspective view thereof. This centrifugal pump has a structure in which a motor 12 is attached to a pump case 11. The pump case 11 has an impeller side case 13 and a drive side case
It is fixed by nuts 15a and 15b, and is divided into an impeller chamber 18 and a drive chamber 19 by providing a partition wall 17 on a joint surface of both via a ring-shaped packing 16.

A suction pipe 20 and a discharge pipe 21 communicate with the impeller chamber 18, and an impeller 22 is disposed inside. The impeller 22 has a substantially disk shape, and in FIG.
Blades 23 are provided at equal positions, and the outer diameter is 24 mm.
And the ratio of the height dimension to the outer diameter of the blade 23 (the blade 2
3 (height dimension / outer diameter) is 0.29 to 0.35. This makes it possible to make the impeller chamber 18 smaller in the outer diameter direction along with the shape of the impeller 22. The boss 2 is located at the center of the impeller 22.
The projection 4 is provided so that the boss portion 24 abuts on a pressing shaft 25 extending from the inner wall of the suction pipe 20, thereby preventing the impeller 22 from floating when rotating.

A donut-shaped recess 26 is formed on the bottom surface of the impeller 22, and an annular magnet 27 is provided therein. Further, a holding plate 28 made of a non-magnetic thin metal material is attached to the impeller 22 by bending the bent portion 29 and engaging the upper surface edge of the impeller 22, so that the magnet 27 falls off from the concave portion 26 and Prevents damage. A bearing recess 30 is formed in the center of the bottom surface of the holding plate 28, and one end of the bearing recess 30 is rotatably disposed in a bearing recess 17 a formed in the center of the partition 17. Is located. Thereby, the impeller 22 is rotatable in the impeller chamber 18.

On the other hand, in the drive chamber 19, a magnet 32 attached to the main shaft 12a of the motor 12 is provided. More specifically, the magnet 32 is fixed to a magnet mount 33, and the main shaft 12 a of the motor 12 is inserted into a through hole 33 a formed in the center of the magnet mount 33, and a screw 34 is inserted from the side.
The structure is fixed by

As shown in FIG. 3, the hot water supply centrifugal pump having the above configuration is provided horizontally below the liquid container 35 of the hot water supply device. Therefore, in the present application, as described above, the outer diameter of the impeller chamber 18 is reduced, and the distance from the bottom surface of the liquid container to the bottom surface of the water heater is substantially equal to that of the motor 1.
2 can be suppressed to a position close to the outside diameter. As a result, it is possible to reduce the size of the hot water supply device and increase the capacity of the liquid container 35.

Then, the motor 12 is driven to drive the spindle 1
When the magnet 32 fixed to 2a is rotated, this magnet 32
Since the magnet 27 of the impeller 22 is magnetically coupled to
The driving force of the motor 12 is transmitted to the impeller 22. As described above, the impeller 22 has an outer diameter of 24 mm or less, and the ratio of the height of the blade 23 to the outer diameter is 0.29 to 0.29.
Since it is formed to 0.35, the load on the motor 12 becomes very small, and the power consumption thereof can be suppressed. If it is 0.35 or more, the rotation of the impeller 22 becomes unstable.

More specifically, a motor 12 having the performance shown in FIG. 4 is used, and the impeller of the centrifugal pump of the present invention has an outer diameter of 22 mm and a ratio of the height dimension of the blade to the outer diameter of 0. If the conventional centrifugal pump and the centrifugal pump of the present application are driven so that the same discharge rate is obtained when the pressure is set to 29, FIG.
As shown in the figure, the power consumption of the conventional device was 3 W, but the power consumption of the present application was reduced to 1.7 W.

[0014]

As is apparent from the above description, according to the centrifugal pump for hot water supply according to the present invention, the impeller has an outer diameter of 2 mm.
Since the ratio of the height dimension of the blade to the outer diameter is set to 0.29 to 0.35, the impeller chamber can be reduced in size, and a hot water supply device to which the hot water supply centrifugal pump is applied is provided. It is possible to reduce the size of the liquid container or to increase the capacity of the liquid container, and also to reduce the load on the motor to greatly reduce the power consumption.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a hot water supply centrifugal pump according to the present embodiment.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a partial sectional view of a hot water supply pot provided with the centrifugal pump of FIG. 1;

FIG. 4 is a graph showing the performance of the motor of FIG.

FIG. 5 is a graph comparing the power consumption ratio of the motor according to the present application and the motor according to the conventional example.

FIG. 6 is a front sectional view of a centrifugal pump according to a conventional example.

[Explanation of symbols]

11 pump case, 12 motor, 17 partition wall, 18
... impeller room, 19 ... drive room, 22 ... impeller, 23 ...
Feather.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A47J 27/21-27/212 A47J 41/00-41/02 F04D 13/02

Claims (1)

(57) [Scope of request for utility model registration] 1. An impeller-side case and a drive-side case are connected and integrated via a partition, and the impeller is rotatably housed in the impeller-side case, and a motor drive unit is disposed in the drive-side case. In a hot water supply centrifugal pump in which a magnetic coupling means is provided for each of an impeller and a drive unit, the impeller has an outer diameter of 24 mm or less, and the ratio of the height of the blades to the outer diameter is 0.29-0. .35, wherein the impeller chamber is formed in accordance with the shape of the impeller.