JPS6329611A - Hot water feeder - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a hot water supply system which uses a centrifugal pump for discharging hot water.

BACKGROUND OF THE INVENTION In this type of water heater, the present inventors have proposed a centrifugal pump as shown in FIG.

That is, the power transmission magnet 3 is attached to the drive side keyta shaft 31.
2 is fixed to the magnet 32, and an impeller 35 is provided opposite the magnet 32 via a partition plate 34' forming a pump chamber 33'f. Magnets 36 are also embedded in this impeller 35, and these magnets 32° 36 are opposed to each other. The impeller 35 is rotatable with respect to the fixed shaft 37 by inserting a bearing portion 38 fixed to the impeller 35 through the fixed shaft 37. Further, the tip of the bearing portion 38 is spherical, and the top thereof is in contact with the partition plate 34.

Problems to be Solved by the Invention However, in such a bearing structure using magnetic coupling, if the centricity is off, especially in the dimensional relationship between the magnets 32 and 36, the bearing inserted into the fixed shaft 37 may Wear on the inside of the portion 38 increases. The reason for this is that in the case of magnetic coupling, the magnets 32 and 36 try to rotate in a balanced position due to the relationship of their magnetic fields, but the fixed shaft 3
7 determines the center of the impeller 35, and if the dimensional relationship with the drive side magnet 32 varies between pumps, vibration will increase,
Then, the inner surface of the bearing portion 37, which is a sliding portion, wears out.

The present invention solves these problems and provides a water heater equipped with a centrifugal pump that can absorb some dimensional variations.

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems is to provide struts for supporting the impeller of a centrifugal pump in the upper and lower directions of the central part of the impeller. This is supported by two points.

For production 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 elevator because they 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, so that the center of the drive-side magnet and the impeller Even when the centers of the magnets inside the magnets are dimensionally different, the fulcrum can be moved freely, resulting in a centrifugal pump with a well-balanced impeller, less vibration, and less wear on the sliding parts. As a result, it is possible to provide a water heater that does not contain impurities due to wear and has low noise.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIG. 1, reference numeral 1 denotes an exterior main body of a water heater, in which a container 2 for storing hot water is provided. Reference numeral 3 denotes an inner stopper attached to the container 2 so as to close the mouth thereof. 4 is the exterior body 1
It is a top lid that is attached so that the top can be opened and closed.

Reference numeral 5 denotes a reverse valve, which passes through the inner stopper 3 and communicates with the inside of the container 2, and also communicates with the atmosphere through the boiling detection section 6. 7 is a motor provided at the bottom of the case (between the exterior main body 1 and the container 2). 8 is a centrifugal pump driven by a motor, and its suction port 9 communicates with the center of the bottom of the container 2.

10 is a discharge port of the centrifugal pump 8, and hot water is pumped upward through a discharge pipe 11, and is poured into a pot or the like through a water inlet 12. Reference numeral 13 denotes a heater, which is attached to the lower side surface of the container 2. Reference numeral 14 denotes a starting switch and a variable resistor for driving the motor, which are operated via a rod 16 when a push button 15 is pressed. 1 is a compression type spring, and this spring 17 always urges the rod 16 upward.

Next, the centrifugal pump 8 will be explained with reference to FIGS. 2 and 3. Reference numeral 18 denotes an impeller having radial blades 19 and magnets, and a pump chamber 21 is formed concentrically along the outer periphery of the impeller 18.

The magnet 20 of the impeller 18 is embedded within the impeller 18 and faces a drive-side magnet 23 via a partition plate 22 that constitutes a pump chamber 21 . The magnet 23 is fixed to the shaft 7a of the motor 7, and the magnet 2o and the magnet 23
The power of the motor 7 is magnetically coupled to the impeller 18.
is transmitted to.

Here, the pump chamber 21 of the centrifugal pump 8 is located in the casing 2
4 and a partition plate 22, the impeller 18 is inserted into the pump chamber 21, and the impeller 18 is fixed to the pillars 25 and 26, which are provided with protrusions to prevent rotation on the outer periphery in the vertical direction of the central part. are doing.

The tips of the struts 25 and 26 are supported between the bearing section 27 of the suction port of the casing 24 and the partition plate 22. The struts 25 and 26 are loosely supported so that they can move somewhat in a direction perpendicular to their axes (left and right in FIG. 2), and have spherical tops 25a and 26a at the tips of the struts.
The bearing part 27 and the partition wall plate 22 are brought into contact only at this point.

The operation of the above configuration will now be described.

When pouring hot water in a state where the hot water in the container 2 is full, pressing down on the push button 15 turns on the start switch 14, and pressing it down further changes the resistance and changes the supply voltage. Then, the motor 7 is energized. As this motor 7 rotates, the impeller 18 rotates due to magnetic coupling between the magnets 20 and 23, sucks hot water from the suction port 9 of the centrifugal pump 8, pressurizes it with the impeller 18, and discharges hot water from the discharge port 1o to the entire discharge pump 11. Through this, hot water is poured out from the spout 12 to the outside.

Here, to explain the operation of the centrifugal pump in detail, the rotation of the drive side magnet 23 causes the magnetically coupled impeller side magnet 20 to rotate, but even if the center axes of the magnet 23 and the magnet 2o are deviated, , the impeller 18 has a spherical top portion 25a.
, 26a and is movable, the magnet 20 automatically faces the drive-side magnet 23. Therefore, there is no vibration due to the rotation of the impeller 17 and no wear on the bearing portion, and a quiet centrifugal pump with little vibration can be obtained.

Effects of the Invention As described above, according to the present invention, it is possible to configure a bearing suitable for magnetic coupling as a centrifugal boss of a water heater, so that impurities due to wear of the bearing part are hardly mixed into the hot water. Moreover, it was possible to obtain a quiet water heater.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a water heater according to an embodiment of the present invention, Fig. 2 is a side sectional view of a centrifugal pump incorporated in the same device, and Fig. 3 is a partially cutaway view of the centrifugal pump. 100 and 4 are side sectional views of the centrifugal pumps proposed so far. 2-・・・Container, 8・Centrifugal pump, 18・River・
Impeller, 20.23... Magnet, 21... Pump chamber, 22... Partition plate, 25.26... Support. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A centrifugal pump is installed at the bottom of the hot water storage container to pump up the hot water in the container and pour it from the water inlet. A hot water supply device in which the centrifugal pump has struts above and below the center of the impeller of the centrifugal pump, and the impeller is supported at two points at the upper and lower ends of the struts.