JPH074321B2 - Water heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot water supply device for pouring hot water by a centrifugal pump.

2. Description of the Related Art In this type of hot water supply apparatus, the present inventors have proposed a centrifugal pump as shown in FIG.

That is, a magnet 32 for power transmission is fixed to the drive-side motor shaft 31, and an impeller 35 is provided facing the magnet 32 via a partition plate 34 that forms a pump chamber 33.
A magnet 36 is also embedded in the impeller 35, and these magnets 32 and 36 are opposed to each other. Further, the impeller 35 is rotatable with respect to the fixed shaft 37 by inserting the bearing portion 38 fixed to the impeller 35 into the fixed shaft 37. Further, the tip of the bearing 38 has a shape, and the top thereof is in contact with the partition plate 34.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a bearing structure by magnetic coupling, particularly in the dimensional relationship between the magnet 32 and the magnet 36, when the center is deviated, the bearing portion inserted into the fixed shaft 37 is inserted. Increased wear inside 38. The reason for this is that in the case of magnetic coupling, the fixed shaft 37 tries to rotate in a balanced positional relationship due to the magnetic field relationship between the magnet 32 and the magnet 36.
Since the center of the bearing is determined, the vibration between the magnet 32 on the driving side and the center of the driving side magnet 32 is increased, and the inner surface of the bearing portion 37, which is a sliding portion, is worn.

The present invention solves such a problem and provides a hot water supply apparatus including a centrifugal pump capable of absorbing some dimensional variations.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to support the impeller of a centrifugal pump at two points at the upper and lower ends of a column at its center.

Operation The effects of such technical means are as follows.

That is, when the drive-side magnet rotates due to the rotation of the motor shaft, the rotation is transmitted to the magnet in the impeller because the magnets are magnetically coupled. At that time, the fulcrum of the column supporting the impeller moves in accordance with the rotation of the drive-side magnet, and the impeller rotates in a balanced state, and the center of the drive-side magnet and the impeller are rotated. Since the fulcrum can move freely even when the centers of the magnets inside are dimensionally different, it is possible to obtain a centrifugal pump with well-balanced impellers, less vibration, and less wear of sliding parts. result,
It is possible to provide a hot water supply device which is free of impurities due to wear and has low noise.

Example Hereinafter, one example of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is an exterior main body of the hot water supply device, which is provided inside a container 2 for storing hot water. Reference numeral 3 is an inner plug attached so as to seal the mouth of the container 2. Reference numeral 4 denotes an upper lid attached so that the upper portion of the exterior body 1 can be opened and closed.

A check valve 5 penetrates the inside plug 3 to communicate with the inside of the container 2, and also communicates with the atmosphere through the boiling detection unit 6. Reference numeral 7 is a motor provided at the bottom between the exterior main body 1 and the container 2. A centrifugal pump 8 is driven by a motor 7, and its suction port 9 communicates with the center of the bottom of the container 2.
Reference numeral 10 is a discharge port of the centrifugal pump 8, and hot water is pumped upward through a discharge pipe 11 and poured into a cup or the like from a water injection port 12. Reference numeral 13 denotes a heater, which is mounted on the lower side surface of the container 2. Reference numeral 14 is a start switch for driving the motor 7 and a variable resistor, which is operated via the rod 16 by the push operation of the push button 15. Reference numeral 17 is a compression type spring, and this spring 17 constantly urges the rod 16 to push upward.

Next, the centrifugal pump 8 will be described with reference to FIGS. Reference numeral 18 denotes an impeller having radial vanes 19 and a magnet 20. The impeller 18 is concentrically arranged along the outer circumference of the impeller 18.
Forming 21. The magnet 20 of the impeller 18 is embedded in the impeller 18 and faces the drive-side magnet 23 via a partition plate 22 that forms the pump chamber 21. Magnet 23
Is fixed to the shaft 7a of the motor 7, magnetically coupled by the magnet 20 and the magnet 23, and the power of the motor 7 is transmitted to the impeller 18.

Here, the pump chamber 21 of the centrifugal pump 8 comprises a casing 24 and a partition plate 22, and the impeller 18 is placed in the pump chamber 21.
The columns 25 and 26, which are provided with anti-rotation protrusions on the outer periphery, are fixed to the impeller 18 in the vertical direction of the central portion.

The tip of the column 25 is supported in the recess of the bearing 27 in the suction port 9 of the casing 24, and the tip of the column 26 is in contact with the partition plate 22. That is, the columns 25 and 26 are loosely supported so as to be movable in a direction (right and left in FIG. 2) orthogonal to the axis thereof, and only the spherical tops 25a and 26a at the ends of the columns support the bearings. The portion 27 and the partition plate 22 are brought into contact with each other.

Next, the operation of the above configuration will be described. When pouring the hot water in the container 2 when the hot water is stored, the push button 15 is pushed down to turn on the start switch 14, and by further pushing it, the resistance is changed and the supply voltage is changed. The motor 7 is energized. This motor 7
When the rotor rotates, the impeller 18 rotates due to the magnetic coupling of the magnet 20 and the magnet 23, sucks hot water from the suction port 9 of the centrifugal pump 8, pressurizes by the impeller 18, passes through the discharge pump 11 through the discharge port 10, and spouts. From 12 hot water is poured outside.

Here, in detail about the operation of the centrifugal pump, the impeller-side magnet 20 magnetically coupled by the rotation of the drive-side magnet 23 rotates, but even if the central axes of the magnet 23 and the magnet 20 are off, Since the impeller 18 is supported at two points of the spherical tops 25a and 26a and is movable, the magnet 20 automatically faces the drive-side magnet 23. Therefore, there is no vibration due to rotation of the impeller 17 and wear of the bearing portion, and a quiet centrifugal pump with little vibration can be obtained.

As described above, according to the present invention, since the impeller supporting structure suitable for magnetic coupling is used as the centrifugal pump of the hot water supply device, impurities due to the wear of the bearing portion are hardly mixed in the hot water, and It was possible to obtain a quiet water heater.

[Brief description of drawings]

FIG. 1 is a sectional view of a water heater showing an embodiment of the present invention, FIG. 2 is a side sectional view of a centrifugal pump incorporated in the apparatus, and FIG. 3 is a partial cutaway view of the centrifugal pump. The front view and FIG. 4 are side sectional views of the centrifugal pumps proposed so far. 2 ... container, 8 ... centrifugal pump, 18 ... impeller, 20,2
3 ... Magnet, 21 ... Pump chamber, 22 ... Partition plate, 25, 26 ...
Prop.

Claims (1)

[Claims] 1. A centrifugal pump for pumping hot water in a hot water storage container and pouring from a water injection port, the centrifugal pump being provided with a magnet in an impeller, which is provided with a motor through a partition plate of a pump chamber. A water heater that is magnetically coupled to a magnet fixed to a shaft and that supports the impeller at two points, that is, the upper and lower ends of a pillar at its center.