JP2579749Y2 - Pot water heater - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus for pots such as electric pots, and more particularly to a hot water supply apparatus using a centrifugal pump.

[0002]

2. Description of the Related Art In a hot water supply apparatus using a centrifugal pump, as shown in FIG.
Is attached. The suction port 3 of the centrifugal pump 2 is connected to the bottom surface of the liquid container 1, and the discharge port 5 is connected to the lower end of the hot water supply pipe 6. The hot water supply pipe 6 is provided upright along the front surface of the liquid container 1 .

The outlet 5 protrudes from a discharge hole 8 provided in the wall of a casing 7 of the centrifugal pump 2, and is connected to the lower end of the hot water supply pipe 6 through a joint tube 9.

[0004] As described above, the conventional centrifugal pump 2 has a discharge hole 8 for convenience in connecting the discharge port 5 to the lower end of the hot water supply pipe 6.
Was provided forward on the wall surface of the casing 7.

[0005]

SUMMARY OF THE INVENTION In a conventional pot provided with a hot water supply device as described above, a centrifugal pump is used when the pot is used for the first time, or when the remaining hot water is once discarded and then used again with water. In some cases, air may remain inside the impeller chamber 2. In addition, when hot water is supplied immediately after boiling, air bubbles may be generated in the impeller chamber.

[0006] The air collected in the impeller chamber as described above is hard to be discharged to the outside of the room, and this has caused a shortage of discharge amount and generation of noise.

Therefore, an object of the present invention is to provide a water heater having a centrifugal pump having a structure in which air in an impeller chamber is easily discharged.

[0008]

A first means for solving the above problems is to mount a centrifugal pump on the lower surface of a liquid container, and to connect the suction port and the discharge port of the centrifugal pump to the inside of the liquid container and the hot water supply, respectively. In a hot water supply device for a pot connected to a pipe, a discharge hole communicating with the discharge port is provided upward on a casing wall surface of the centrifugal pump.

In the second means, the mounting reference line passing through the axis of the impeller of the centrifugal pump in the first means has an inclination angle such that the impeller side is higher than the motor side with respect to the lower surface of the liquid container. Things.

[0010]

In the hot water supply apparatus according to the first means, in a normal use state of the pot, the discharge hole provided in the casing of the centrifugal pump faces upward, so that the internal air naturally flows from the discharge hole to the discharge port. It is discharged outside through a hot water supply pipe.

Further, in the hot water supply apparatus according to the second means, in a normal use state of the pot, the casing of the centrifugal pump is inclined obliquely upward, so that the air inside the casing easily gathers at the discharge hole portion. It is easier to discharge.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in FIGS. 1 to 4 is a hot water supply device in an electric pot 11. In this hot water supply apparatus, a heat shield plate 13 is provided along the lower surface of the liquid container 12, and a hot water supply pipe 14 is provided along the front surface of the liquid container 12.
Is erected. The upper end of the hot water supply pipe 14 is
It is communicated with one hot water supply port 15. A centrifugal pump 16 is attached to the lower surface of the heat shield plate 13.

The centrifugal pump 16 comprises a motor 17 and a pump 18 as shown in FIGS.
Are the motor-side casing 19 and the impeller-side casing 2
1 and both casings 19 and 21 are integrally connected with a partition wall 22 interposed therebetween. A drive shaft 25 of the motor 17 projects into a drive chamber 23 formed by the partition wall 22 and the motor-side casing 19, and a ring-shaped magnet 27 is attached to a rotating plate 26 attached to the drive shaft 25.

The partition 22 and the impeller casing 2
1 is formed in the impeller chamber 28.
The impeller 31 is rotatably attached to the surface via the bearing member 29. A ring-shaped magnet 32 is embedded in the surface of the impeller 31 on the partition 22 side, and is magnetically coupled to the magnet 27 on the drive chamber 23 side. The motor side casing 19 is integrally provided with a mounting portion 33 bent outward.

A suction hole 34 is formed in the impeller side casing 21 on the center axis of the impeller 31, and a bent suction port 35 bent at 90 degrees is integrally provided in the suction hole 34. On the inner peripheral surface of the bent suction port 35, a projection 36 provided on the center line of the impeller 31 is provided.
Abut on the center boss 37 of the first impeller 31 to prevent the impeller 31 from floating. A discharge hole 38 is provided in a part of the peripheral surface of the impeller-side casing 21, and a discharge port 39 is provided outside the discharge hole 38 in a substantially tangential direction on the outer peripheral surface of the impeller-side casing 21.

The bent suction port 35 and the discharge port 39 are
Both are provided at positions facing upward in a normal use state (see FIG. 1). The bent suction port 35 is connected to the connection port 42 of the liquid container 12 via the joint tube 43.
Further, the discharge port 39 is connected to a lower end of the hot water supply pipe 14 via a joint tube 41.

The mounting reference line L (see FIG. 2) on the center line of the impeller 31 of the centrifugal pump 16 may be parallel to the bottom surface of the liquid container 12 (ie, horizontal in normal use). As shown in FIG. 2, by slightly reducing the bending angle of the mounting portion 33 of the motor-side casing 19, the mounting reference line L is inclined such that the impeller-side casing 21 becomes slightly higher in a normal use state. It may have θ.

Since the hot water supply apparatus according to the embodiment is as described above, the air mixed with the liquid in the impeller chamber 28 collects at a portion of the discharge hole 38 located on the upper side in the circumferential direction of the impeller chamber 28, and the discharge port. 39, the water is discharged to the outside via the hot water supply pipe 14 and the hot water supply port 15. Also, as shown in FIG.
As described above, 8 is positioned higher in the circumferential direction of the impeller chamber 28, but since it is also positioned higher in the axial direction, the air inside the discharge hole 38 is more likely to collect inside.

[0019]

[Effects of the Invention] As described above, this invention easily discharges air mixed with the liquid in the impeller chamber of the centrifugal pump.
This has the effect of stabilizing the discharge amount and suppressing generation of noise during discharge.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a partly omitted embodiment;

FIG. 2 is a vertical cross-sectional side view partially omitted from the above.

FIG. 3 is a sectional view of the centrifugal pump according to the first embodiment;

FIG. 4 is an exploded perspective view of the centrifugal pump according to the first embodiment;

FIG. 5 is a vertical cross-sectional front view of a conventional example with a part omitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electric pot 12 Liquid container 13 Heat shield plate 14 Hot water supply pipe 15 Hot water supply port 16 Centrifugal pump 17 Motor 18 Pump 19 Motor side casing 21 Impeller side casing 22 Partition wall 23 Drive room 25 Drive shaft 26 Rotating plate 27 Magnet 28 Impeller room 29 Bearing member DESCRIPTION OF SYMBOLS 31 Impeller 32 Magnet 33 Attachment part 34 Suction hole 35 Bend suction port 36 Projection 37 Boss part 38 Discharge hole 39 Discharge port 41 Joint tube 42 Connection port 43 Joint tube

Claims (2)

(57) [Scope of request for utility model registration] 1. A centrifugal pump is attached to a lower surface of a liquid container,
In a hot water supply device for a pot in which a suction port and a discharge port of the centrifugal pump are respectively connected to the inside of the liquid container and a hot water supply pipe, a discharge hole communicating with the discharge port is provided upward on a casing wall surface of the centrifugal pump. A hot water supply device for a pot. 2. The hot water supply of a pot according to claim 1, wherein an attachment reference line passing through an axis of an impeller of the centrifugal pump has an inclination angle such that an impeller side is higher than a motor side with respect to the lower surface of the liquid container. apparatus.