JP3098787B2 - Electric 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 an electric water heater using a liquid pump used for tapping.

[0002]

2. Description of the Related Art Conventionally, in this type of liquid pump, a water introduction port for drawing out the liquid and a water suction port of the pump are connected by a tube or the like to the outside of a container of an inner container for accommodating the liquid, and connected to a tapping side of an impeller. A case provided with a tap hole is provided, and a magnetic body composed of a magnet or the like is attached to a portion opposite to a drive source such as a motor and the impeller, and rotation of the drive source is transmitted to the impeller by magnetic coupling.

On the impeller side, the magnet and the rotating shaft are fixed to the impeller body by a method such as adhesion or welding, and the impeller body rotates together with the magnet. With such a configuration, the liquid pump is mounted as a single pump unit on the bottom of the inner container with a fitting or the like. In addition, a filter for preventing foreign matter from entering is attached to the water suction port of the liquid pump so that foreign matter does not enter from inside the container between the impeller and the case.

[0004] The pump unit and the case are attached to a fitting via a packing made of silicon rubber or the like so as to relieve stress.

Further, the pump chamber for accommodating the impeller and the motor drive side are configured so as to be watertight so that hot water does not leak by a sealing member such as an O-ring.

[0006] A heating element is provided at the bottom of the inner container, and is fixed so that the outer case is clamped through a hakama by a container mounting bracket.

[0007]

However, according to the above configuration, for example, the pump unit is located at the bottom outside the inner container, and the impeller and the cover are configured to be covered by the case at an arbitrary interval. However, if foreign matter enters the inner container by mistake, the foreign matter may get into the pump chamber and get caught between the impeller and the case, causing the motor to stop. In this case, the electric water heater cannot supply hot water and cannot be used. A filter is attached to the water inlet to prevent foreign matter from entering. However, if the filter is accidentally lost or the user forgets to attach the filter, foreign matter enters. Therefore, foreign matter gets caught between the impeller and the case, the impeller stops, the magnetically coupled drive source stops, and the hot water runs out.

Further, when used for a long period of time, water scale or the like accumulates in the pump chamber and enters the gap between the impeller and the case, that is, the motor stops.

Also, when water is poured into the inner container when the water enters the pump chamber, the air does not escape smoothly from the water introduction port, and an air layer is formed. At this time, if an air layer is formed in the pump chamber, cavitation occurs, and the pump chamber becomes full of bubbles, and the impeller runs idle and cannot discharge hot water. Also, the pump unit assembly is made of a resin with good hot water resistance, but because of its weak strength, it was necessary to assemble it through packing to reduce the stress. Attention must be paid to controlling the torque when tightening the resin. In addition, when the case of the pump is not sufficiently fastened or the packing deteriorates, hot water may leak from a gap in the case. Further, in such a configuration, the stopped state of the pump cannot be confirmed from the outside, and the function cannot be recovered unless the entire unit is disassembled and the pump unit is replaced or the pump unit is disassembled and cleaned.

[0010] Further, since the inner container cannot be removed, the inside of the container cannot be washed. When washing the inner container, water was applied to the main body to get into the main body, which sometimes caused a failure. The first object of the present invention is to solve such a conventional problem. A first object is to separate a pump unit having an impeller and constituting a pump chamber and a drive unit for driving the pump unit, so that foreign matter or the like is temporarily stored in the pump chamber. Even if it is clogged, it can be easily disassembled and cleaned from inside the container, and the discharge of hot water can be assured. A second object is to remove the inner container by itself and remove the pump unit and the inner container from the main body so that the inner container can be washed.

A third object is to simplify the mounting structure by mounting the drive unit on a substrate . A fourth object is to stop the power supply when the container and the pump unit are removed from the main body, and to ensure safety. An object of the present invention is to provide such an electric water heater.

[0012]

To achieve the above Symbol purposes SUMMARY OF THE INVENTION The present invention includes a inner container for containing the liquid, the inner container side
Pump room with impeller and water inlet containing magnetic material inside
And Ponpuyuni' bets with, by the rotation of the impeller
A water channel for guiding the hot water in the inner container to the outside of the container, and the impeller
A magnetic material such as a motor is provided outside the inner container against the magnetic material.
And a drive unit provided with
The unit drives the impeller inside the inner container and
Then, the inner container was moved from the electric kettle body to the pump unit.
An electric water heater that is configured to be attached and detached together with the heater.

[0013] Further, the drive unit may be an electric water heater.
2. The electric water heater according to claim 1, which is disposed on a circuit board to be controlled.
It is a cauldron .

Further , the impeller can be detached from the inner container.
An electric water heater according to claim 1, characterized in that:
Things.

Further, when the inner container is removed, the power supply is stopped.
An electric water heater according to claim 1, wherein
It is a thing.

[0016]

According to the configuration of the action The present invention, located within the inner container by the magnetic attraction force generated between the impeller is provided on the magnetic body and the pump unit of the drive unit outside the inner container side of the magnetic impeller Is transmitted from outside the container. Since a pump unit composed of an impeller for discharging hot water and a drive unit having a drive source including a motor for transmitting drive to the impeller and the magnetic body are separated, a sealing material such as packing is not required.

Further , the drive unit can be directly mounted and fixed on the substrate. The impeller is covered by a case, and by taking this case, the impeller can be attached and detached. Further, the power can be turned off by removing the container.

[0018]

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

The one shown in FIG. 1 is installed for tapping of an electric water heater, that is, hot water in a container 2 having a heating element 1 is forcibly sent out to a tapping channel 4 by a liquid pump 3. It is discharged from the tap 5. 6
Is a check valve interposed in the tapping path 4, and 7 is a lid of the container 2. The liquid pump 3 includes a pump side located inside the container and a drive side such as a motor located outside the inner container.

The rotation of a drive source 8 such as a motor is transmitted to an impeller 10 in a container via a magnetic transmission means 9. More specifically, the impeller 10 is provided with a water inlet 16.
This case 1 is covered by a case 13 having
3 is provided with a fixed shaft 17 for supporting the rotation of the impeller 10. The impeller 10 is provided with a blade 18 on one side and encloses a magnetic body 22 by the cover 11. The impeller 10 is configured to rotate in contact with the container 2 on the side opposite to the blade 18 as a pump unit.

One drive side includes a magnetic body 14 and a drive plate 15 directly connected to the drive source 8 to form a drive unit. A discharge port 12 for discharging hot water is provided on the outer periphery of the impeller 10. The case 13 forms a part of the tapping path 4.

The impeller 10 rotates on the outer peripheral surface of the fixed shaft 17, and its detailed configuration is as shown in FIG. That is, an impeller main body (hereinafter referred to as a main body) 19 having a blade 18 formed on one side surface has a substantially cap shape, and has a ring-shaped magnetic substance storage space 20 on the side opposite to the blade forming surface. The opening of the magnetic material storage space 20 on the drive source 8 side has a projection integrally formed and supports the fixed shaft 17. The impeller 10 is closed by a cover 11. A magnetic body 22 is provided in the magnetic body storage space 20, and at least one or both of the magnetic bodies 14 and 22 are magnetized by a magnetic body corresponding to the magnetic body 14 on the driving side. Accordingly, the rotation of the drive source 8 such as a motor can be transmitted to the impeller 10.

Also, since the inner container recess 25 is formed and the discharge port 12 for discharging to the outside is provided, the impeller 10 is disposed in the recess 25, and the case 13 provided with the water introduction port 16 so as to cover the recess 25 is disposed. The effective water usage of hot water increases and the remaining water decreases.

The inner container 2 is a spout 2 for holding the inner container 2.
6 is attached to the container fitting 29 so that the outer case 27 is sandwiched by the hakama 28. In the above configuration, the rotation of the drive source 8 is transmitted to the impeller 10 by the magnetic coupling between the magnetic bodies 14 and 22. Impeller 10 is container 2
The hot water inside is sucked and sent to the tapping path 4 and discharged from the tapping port 5.

The magnetic body 22 on the impeller 10 side
The rotational force transmitted to the magnetic body 22 by the magnetic attraction with the drive-side magnetic body 14 is transmitted to the impeller 10 of the pump unit.

Since the liquid pump unit is separated into the drive unit side and the pump unit side which discharges, the discharge side pump unit is located on the inner surface of the container.

Therefore, by removing the case 13 of the pump unit, the impeller 10 can be removed from the inner side of the container. Furthermore, the whole container is designed to be detachable from the electric kettle body.

Therefore, even if foreign matter such as tea leaves enters the container, it can be easily disassembled and cleaned.

Further, since a pump chamber is provided in the inner container 2, when water is poured into the container, the air in the case 13 is easy to escape, so that no air layer is formed in the pump and no air is trapped in the impeller 10 Hot water can be completely discharged to the outside even during the rotation of.

The pump unit for discharging hot water is located in the inner container 2, and the drive unit for driving the impeller 10 on the pump side is provided outside the container, so that packing and the like for sealing the pump side and the drive side are provided. Becomes unnecessary. Also, as the number of parts is reduced, the assembly is simplified. The inner container 2 is detachably surrounded by an outer case 28.

The drive unit is mounted on a control circuit board 32 for controlling the water heater by soldering or the like.

The outer case 28 is attached to the body 27 by a hakama 30 and a back plate 31 by a container attachment fitting 29, and the inner container 2 is detachably attached inside the outer case. When the inner container 2 is removed, the power is automatically turned off by a switch 24 provided at the bottom of the inner container 2. The connection with the hot water path 4 is such that the discharge port of the container is automatically closed when it is attached and detached, and opened when it is set.

Therefore, the inner container 2 can be removed to discard hot water or to clean the inner container.

[0034]

As described above, according to the present invention, since the liquid pump unit is separated into the drive unit side and the pump unit side which discharges, the pump unit on the discharge side is located on the inner surface of the container. By removing the case, the impeller can be removed from the inner surface of the inner container. Therefore, even if foreign matter such as tea leaves is mixed in the container, it can be easily cleaned.

Further, since the pump chamber is provided in the inner container, hot water can be completely discharged to the outside even when the impeller is rotating without injecting air into the pump when injecting water into the container.

Further, since the pump side for discharging hot water is located inside the container and the drive side for driving the pump-side impeller is provided outside the container, packing for sealing the pump side and the drive side is not required. Also, as the number of parts is reduced, the assembly is simplified.

Further, since the drive unit side is mounted on the circuit board, parts for mounting can be eliminated and the structure can be simplified.

Further, since the entire container can be removed by making the container detachable, the inner surface of the container can be completely washed without wetting the main body. Therefore, it is possible to prevent a failure due to the ingress of water into the water heater. This enables stable liquid transfer under all circumstances. In addition, the number of parts is small, the processing and assembly are easy, and the cost can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 shows an electric water heater according to a first embodiment of the present invention .
A cross-sectional view of the pump that

FIG. 2 is a sectional view of an electric water heater according to a first embodiment of the present invention, which is used for tapping water;

[Explanation of symbols]

 2 Container 3 Liquid Pump 8 Drive Source 9 Magnetic Transmission Means 10 Impeller 11 Cover 13 Case 14, 22 Magnetic Material 18 Blade 20 Magnetic Material Storage Space 24 Switch 25 Recess 32 Control Circuit Board

Continuation of the front page (56) References JP-A-63-29611 (JP, A) JP-A-63-42891 (JP, U) JP-A-2-119119 (JP, U)

Claims (4)

(57) [Claims] And 1. A inner container containing a liquid, a pump chamber digits set the water guide opening and an impeller containing therein a magnetic material to the inner container side
A pump unit having a water channel leading to Utsuwatai outside the hot water in the inner container by the rotation of the impeller, provided by attaching a magnetic member such as a motor to the outside of the inner container against the magnetic body of the impeller A driving unit, and driving the impeller in the inner container by the driving unit,
An electric water heater in which the inner container is detachably mounted together with a pump unit from the electric water heater main body . 2. A drive unit for controlling an electric water heater.
The electric water heater according to claim 1, which is disposed on a circuit board. 3. The method according to claim 1, wherein the impeller can be detached from the inner container.
The electric kettle according to claim 1, characterized in that: 4. The power supply is stopped when the inner container is removed.
The electric kettle according to claim 1, characterized in that: