JP2000145683A - Pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe and small-sized pump device by integrally constituting a pump chamber and an electric motor part and reducing costs by a simple structure, concerning a pump device for pumping fluid housed in a container. SOLUTION: An impeller and a rotor 12 of an electric motor part 4 are connected to each other by a rotary shaft 13 and rotatably mounted in a pump chamber 7 having a pump chamber inlet communicated with a housing container 1 for housing fluid, and a stator 11 of the electric motor part 4 is arranged on the outer peripheral part of the pump chamber 7, and therefore, the electric motor part 4 and the pump chamber 7 are approximately integrally formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device for pumping liquid contained in a container with a pump and applying the pump to an electric kettle or the like.

[0002]

2. Description of the Related Art Heretofore, generally, in a pump device applied to an electric kettle or the like, a pump and an electric motor are separately arranged. This is because the pump is disposed in the water channel to circulate water, but the motor is immersed in water, which causes a failure such as rust. As a structure in which the pump and the electric motor are separately arranged and the electric motor is not immersed in water, there has been a structure in which the driving force of the electric motor is transmitted to the impeller of the pump using a magnetic force of a magnet over a partition wall surrounding a water channel. .

FIG. 11 is a longitudinal sectional view of a conventional pump device. In FIG. 11, 1 is a storage container for storing water (hot water) in an electric kettle pot, 2 is a water pipe for drawing out water (hot water) from the bottom of the storage vessel 1, and 3 is provided after the water pipe 2 rises. A discharge port for discharging water (hot water).
Reference numeral 4 denotes an electric motor connected to a power supply to generate a driving force, and reference numeral 5 denotes a centrifugal impeller (impeller) provided in the water pipe 2 to generate a water flow. Reference numeral 6 denotes a non-magnetic partition wall located between the centrifugal impeller (impeller) 5 and the electric motor unit 4. Reference numeral 7 denotes a partition provided between the storage container 1 and the water pipe 2. Pump room. 8a is a disk-shaped magnet fixedly supported on the upper part of the rotating shaft of the motor unit 4, and 8b is a disk-shaped magnet fixed to the lower surface of the centrifugal impeller (impeller) 5. The disc-shaped magnets 8a and 8b are opposed to each other with a non-magnetic partition wall 7 interposed therebetween.
Reference numeral 9 denotes a heater provided to raise the temperature of a liquid, for example, water, in the storage container 1, and is provided on the bottom surface of the storage container 1. Here, a centrifugal impeller (impeller) 5 is used for the pump, but an axial flow type / screw type may be used.

Next, the operation of the conventional pump device will be described. Since the motor unit 4 is connected to the power supply, it is driven to rotate by operating means such as turning on a switch. Since the disk-shaped magnet 8a is fixed to the rotating shaft of the motor unit 4, the disk-shaped magnet 8a rotates with the rotation of the motor unit 4. Further, the magnet 8b rotates by being attracted to the magnetic force of the magnet 8a. Here, since the centrifugal impeller (impeller) 5 is fixed to the disk-shaped magnet 8b, the rotation of the disk-shaped magnet 8b naturally rotates the centrifugal impeller (impeller) 5, and the pump chamber 7 Water flow is generated in
Therefore, the hot water in the water pipe 2 is pumped to the upper part of the water pipe 2, and the hot water in the storage container 1 is sucked into the water pipe 2. On the other hand, the pumped hot water passes through the rising portion of the water pipe 2 and is discharged from the discharge port 3 to be used for drinking and the like.

[0005]

The conventional pump device includes a non-magnetic partition wall 6, disk-shaped magnets 8a and 8b.
Since the electric motor unit 4 is provided with the interposed portion, the height of the device is increased, and there is a problem that the size of the device cannot be reduced. Further, since expensive magnets 8a and 8b are required and the number of parts is increased, there is a problem that an inexpensive pump device cannot be provided as a whole.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the motor unit and the pump chamber are integrally formed, so that the overall height of the apparatus can be designed to be low and the size can be reduced.
It is an object of the present invention to provide an inexpensive and highly safe pump device.

[0007]

According to the present invention, there is provided a pump chamber having a suction side inlet communicated with a container containing a liquid,
In the pump chamber, an impeller and a rotor of an electric motor having a rotary shaft connected to the impeller are rotatably mounted, and a stator of the electric motor is disposed around the outer periphery of the pump chamber in opposition to the rotor. It was done.

[0008] In the present invention, the surface of the rotor is coated with a material having high corrosion resistance.

Further, in the present invention, the surface of the rotor is subjected to a corrosion-resistant alumite treatment.

Further, the present invention uses a permanent magnet for the rotor.

Further, according to the present invention, the pump chamber is provided with an impeller above and a rotor below, and at least a gap between the inner peripheral wall surface of the pump chamber and the rotor is provided between the impeller and the rotor. A partition plate for covering is provided.

According to the present invention, there is provided a pump chamber in which a suction side inlet communicates with a container containing a liquid, and an impeller and a rotor of an electric motor having a rotary shaft connected to the impeller are rotatably mounted in the pump chamber. A stator of an electric motor was provided around the outer periphery of the pump chamber so as to face the rotor, and the rotor was provided so as to be able to move in the axial direction, and a blocking wall for closing the inlet on the suction side was provided on the impeller. Things.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a longitudinal sectional view of a pump device according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing a main part of the device. This Embodiment 1
This relates to a case where the pump device is applied to an electric kettle. 1 and 2, reference numeral 1 denotes a storage container for storing water (hot water) or the like in an electric kettle, 2 denotes a water guide pipe provided outside the storage container 1 and introduces water or the like from the storage container 1, and 3 denotes a water pipe. This outlet is provided at the end of the water pipe 2 after rising, and discharges water (hot water) to the outside of the electric kettle for drinking and the like. Reference numeral 4 denotes a shaded coil induction type electric motor unit which is connected to a power source and generates a driving force. Reference numeral 5 denotes a centrifugal impeller (impeller) which generates a water flow by rotating. Reference numeral 7 denotes a pump chamber that connects the storage container 1 and the water guide pipe 2 and communicates with the bottom of the storage container 1 on the suction side. Reference numeral 9 denotes a bottom surface of the storage container 1 for increasing the temperature of the liquid in the storage container 1 such as water. It is a heater provided in. Numeral 10 denotes a partition wall made of a non-magnetic material for forming the pump chamber 7. The partition 10 has an upper surface 10a and a lower surface 10a.
b, the side surface portion 10c. Reference numeral 11 denotes a stator of the motor unit 4, and reference numeral 12 denotes a rotor of the motor unit 4 in which a rotating shaft 13 is connected to a lower part of the centrifugal impeller (impeller) 5.
The rotor 12 is disposed in the pump chamber 7 with the centrifugal impeller (impeller) 5 as an upper part. The stator 11 faces the rotor 12 and is arranged so as to surround the outer peripheral surface of the side surface portion 10 c of the partition wall 10 forming the pump chamber 7. Accordingly, the rotor 12 and the stator 11 are connected to the side surface 10 of the partition 10.
c is interposed therebetween.

A bearing 14a is formed on the bottom surface 10b of the partition 10 surrounding the pump chamber 7 and receives the lower end of the rotary shaft 13. A bearing 14b is located on the upper surface 10a of the partition 10 surrounding the pump chamber 7.
And a bearing for receiving the upper end of the rotating shaft 13.
Reference numeral 15 denotes a motor coil, and reference numeral 16 denotes a shading coil provided on a part of the magnetic pole surface. Here, the motor coil 1
5 and the shading coil 16 constitute the stator 11, and the rotor 12 and the stator 11 constitute the motor unit 4. Therefore, the pump chamber 7 containing the rotor 12 and the motor unit 4 are formed integrally. Reference numeral 17 denotes a pump chamber inlet connecting the storage container 1 and the pump chamber 7, and reference numeral 18 denotes a pump chamber outlet connecting the pump chamber 7 and the water pipe 2. Therefore, the storage container 1 and the water pipe 2 are communicated via the pump chamber 7.
Reference numeral 19 denotes the direction of the moving magnetic field generated from the stator 11 toward the shading coil 16.

Here, the storage container 1, the water pipe 2, the partition 10 of the pump chamber, the pump chamber inlet 17, the pump chamber outlet 18
Is a portion that comes into contact with hot water, and a heat-resistant material such as a polycarbonate resin is used. These may be made of the same material such as a polycarbonate resin,
It may be composed of different heat resistant materials.

Next, the operation of the first embodiment will be described with reference to FIGS. Since the motor unit 4 is connected to a power source,
It is driven by operating means such as turning on a switch. The driving of the motor unit 4 forms a moving magnetic field, and the direction 19 of the moving magnetic field is determined from the stator 11 toward the shading coil 16. That is, when a current flows through the coil 15 of the motor and a current flows, a magnetic field is formed, and when an induced current flows through the shading coil 16, a magnetic field is also generated around the shading coil 16 to form a moving magnetic field. is there.
This moving magnetic field acts on the rotor 12 beyond the side surface portion 10c of the partition wall 10 sandwiched between the stator 11 and the rotor 12, and the rotor 12 is induced to rotate. Here, the partition 10 of the pump room
Is a portion which is in contact with hot water and is made of a heat-resistant material such as polycarbonate resin. Of the partition walls 10 of the pump chamber, partition walls 10 sandwiched between a stator 11 and a rotor 12 are used.
If the thickness of the side surface portion 10c is large, the rotor 12 cannot be efficiently guided and rotated, so that the thickness may be smaller than other portions of the partition wall 10. Partition wall made of polycarbonate resin 10
When the thickness of the side wall 10c of the partition 10 sandwiched between the stator 11 and the rotor 12 is about 0.5 to 1 mm, the rotor 12 can be rotated by the moving magnetic field, Can be kept.

Therefore, when the switch is turned on, a current flows through the coil 15 of the electric motor, and the rotor 12 and the centrifugal impeller (impeller) 5 immediately rotate in the direction 19 of the moving magnetic field at a predetermined rotation speed. Since water (hot water) is stored in the pump chamber 7 in a normal use state of the electric kettle, the centrifugal impeller (impeller) 5 needs a rotating force for generating a water flow. Since the impedance of the coil 15 is increased, it is possible to maintain the characteristics of the electric motor unit 4 for generating a sufficient rotational force in the rotor 12. Here, since both ends of the rotating shaft 13 fixed to the rotor 12 are supported by the bearings 14a and 14b, the rotor 12 is supported and rotated. Further, the water (hot water) stored in the pump chamber 7 serves as a lubricant for the bearings 14a and 14b, and the rotor 12 can keep the bearing 1 without a special lubricant such as oil.
It rotates smoothly while being supported by 4a and 14b.

Accordingly, the water (hot water) in the pump chamber 7 is introduced from the pump chamber outlet 18 into the water pipe 2, and the water (hot water) in the water pipe 2 is pumped up above the water pipe 2. Water (hot water) in the storage container 1 is supplied from the pump chamber inlet 17 to the pump chamber 7.
Inhaled into. The pumped water (hot water) is discharged from the discharge port 3 to the outside of the device. In this case, the water (hot water) is introduced into the water pipe 2 from the pump chamber outlet 18 regardless of the rotation direction of the centrifugal impeller (impeller) 5, and the water (hot water) in the storage container 1 is pumped. It is sucked into the pump chamber 7 from the chamber inlet 17.

FIG. 3 is a perspective view showing a main part of the apparatus. In FIG. 3, the pump chamber inlet 17 is formed in the upper surface 10a of the pump chamber 7 in FIG. 2, whereas the pump chamber inlet 17 is in the same horizontal plane as the pump chamber outlet 18, that is, the side wall 10c of the pump chamber 7. Is formed. As a result, the space of the pump chamber inlet 17 formed between the storage container 1 and the pump chamber 7 can be reduced, and the dimension in the height direction can be further reduced. However, the rotation direction of the centrifugal impeller (impeller) 5 is determined in one direction by the flow path.

In the above description, the electric motor unit 4 of the black-sharing induction type is started by the moving magnetic field formed by the shading coil 16, and the rotor 12 is guided and rotated while being supported by the bearings 14a and 14b. The present invention is not limited to this, and the rotor 12 may be rotated by forming a moving magnetic field using a synchronous motor or an induction motor, which is another AC-only motor.

Further, in the above description, the pump chamber 7 and the water pipe 2 are configured separately, but the present invention is not limited to this, and a centrifugal impeller (impeller) may be provided on a part of the water pipe 2. It is also possible to adopt a configuration in which the rotor 5 and the rotor 12 are housed so that they can be integrally formed.

Embodiment 2 FIG. Since the rotor 12 of the first embodiment is connected to the centrifugal impeller (impeller) 5 by the rotating shaft 13 and is housed in the pump chamber 7, water (hot water) is used in a normal use state of the electric kettle. Etc. will remain soaked. In addition, the stator and rotor of a general electric motor are often made of a silicon steel plate (Fe-Si alloy) having extremely small magnetic hysteresis loss. This silicon steel sheet (Fe-S
(i-alloy) is easily rusted and corroded, so there is a limit to its use when immersed in a liquid such as water (hot water). Therefore, in practice, it is necessary to cover with a film having corrosion resistance, and as a material thereof, a film of a heat-resistant polymer such as polyimide-based, PES-based, or Teflon (registered trademark) -based or silicone-based film of fluororesin is suitable. If a coating of polyimide or the like having a thickness of 30 to 50 μm (μm) is formed on the surface of the rotor 12, sufficient corrosion resistance can be secured, so that the distance between the stator 11 and the rotor 12 is minimized. It does not affect the configuration.

In order to ensure corrosion resistance so as to be able to withstand use by being immersed in a liquid such as water (hot water), the rotor 12 is covered with a coating of polyimide or the like, and the rotor 12 itself is replaced with a silicon steel plate. Alternatively, a stainless steel material having at least magnetic properties such as SUS430 and having high corrosion resistance may be used. In this case, corrosion resistance can be ensured without coating, so that the number of steps for coating and the like can be reduced.

Embodiment 3 FIG. FIG. 4 shows a rotor of an electric motor which is a main part of a pump device according to Embodiment 3 of the present invention. In FIG. 4, the rotor 12 is connected to a centrifugal impeller (impeller) 5 by a rotating shaft 13 and is housed in the pump chamber 7, so that the electric kettle can be used for water (hot water) or the like in a normal use state. Will remain soaked. 20 is the rotor 12
Is an alumite layer formed after anodizing the surface. This alumite treatment is performed as a non-insulating material having an extremely thin structure of about 25 microns (μm) after the rotor 12 is subjected to aluminum plating, so that the characteristics of the motor are impaired both magnetically and electrically. Rather, it does not affect the configuration for reducing the distance between the stator 11 and the rotor 12 to the minimum. Therefore, the corrosion resistance is enhanced even when used by immersing in a liquid such as water (hot water). Originally, the rotor 12 is constituted by an insulated thin plate, and prevents current in the laminating direction. Therefore, when the outer peripheral surface of the rotor 12 is plated with aluminum, a current easily flows in the laminating direction, which is inconsistent with securing the characteristics of the electric motor. This configuration makes it possible to prevent the flow of current in the stacking direction.
This alumite treatment has higher reliability than the corrosion resistant material film of the second embodiment and is suitable for long-term use. In addition, since the corrosion-resistant film thickness is thin, it is possible to obtain the same effect as a film of a corrosion-resistant material at low cost.

Embodiment 4 FIG. 5 is a partial longitudinal sectional view showing a main part of a pump device according to Embodiment 4 of the present invention.
Is a perspective view showing a main pole plate of a stator of the electric motor, and FIG. 7 is a perspective view showing an auxiliary pole plate of the stator of the electric motor. Embodiment 4 relates to a case where the pump device is applied to an electric kettle. In FIG. 5, reference numeral 4 denotes a multi-pole type motor unit which is connected to a power source and generates a driving force, and 5 denotes a centrifugal impeller (impeller) which generates a water flow by rotating. Reference numeral 7 connects the storage container 1 and the water guide pipe 2, and the storage container 1
The pump chamber 10 having a suction side communicating with the bottom of the pump chamber 10 is a partition made of a non-magnetic material to form the pump chamber 7. The partition wall 10 includes an upper surface portion 10a, a bottom surface portion 10b, and a side surface portion 10c. Reference numeral 11 denotes a stator of the electric motor unit 4, 1
Reference numeral 2 denotes a rotor of the electric motor unit 4 which is a permanent magnet having a rotating shaft 13 connected to a lower part of the centrifugal impeller (impeller) 5, and is disposed in the pump chamber 7 above the centrifugal impeller (impeller) 5. 1
4a is a bearing formed on the bottom surface 10b of the partition wall 10 surrounding the pump chamber 7 and receives the lower end of the rotary shaft 13. 14b is formed on the upper surface portion 10a of the partition wall 10 surrounding the pump chamber 7, and has the upper end of the rotary shaft 13. It is a bearing to receive. Reference numeral 15 denotes a motor coil.

5, 6 and 7, reference numeral 21 denotes a concave main electrode plate having a circular flat portion 21a and an outer frame portion 21b.
Is a supplementary electrode plate having a circular hole at its center, and is composed of a flat portion 23 'having a hole at the center. Here, the stator 1
1 is composed of a motor coil 15, a main pole plate 21 and an auxiliary pole plate 23, and the motor section 4 is composed of a stator 11 and a rotor 12. Therefore, the pump chamber 7 containing the rotor 12 and the motor unit 4 are formed integrally. 22a, 22b, 22c
Reference numerals 24a, 2 denote main poles (stators) which are arranged on predetermined circles of the main pole plate 21 at an angle of 120 ° and are projected in a direction perpendicular to the plane portion 21a of the main pole plate 21.
Reference numerals 4b and 24c denote auxiliary poles which are arranged at a boundary of a circular hole on the auxiliary pole plate at an angle of 120 ° and are projected in a direction perpendicular to the plane portion 23 'of the auxiliary pole plate. . Here, the circle in which the main poles 22a, 22b, 22c are arranged and the circle drawn by the hole at the center of the auxiliary electrode plate have the same size.

In FIG. 5, the auxiliary electrode plate 23 accommodates the pump chamber 7 in the center hole, and the direction of FIG.
2a, 22b, 22c are directed downward, and a perforated circular flat portion 23 'is arranged so as to cover the coil 15 of the electric motor from above. The main electrode plate 21 includes main electrodes 22a, 22b, 22
The pump chamber 7 is housed in the circular portion drawn by the arrow c, and the direction of FIG.
a is laid under the coil 15 of the motor, and the outer frame portion 21b is formed so as to cover the coil 15 of the motor from the outside. That is, the coil 15 of the motor is positioned above the flat portion 2 of the auxiliary pole plate 23.
3 ', the lower side is the flat portion 21a of the main electrode plate 21, one side is the outer frame portion 21b of the main electrode plate 21, and the other side is the main poles 22a, 22b, 22c and the auxiliary poles 24a, 24b, 24c. 24
It is surrounded by c. That is, the coil 15 of the electric motor is placed between the main poles 22a, 22b, 22c on the flat portion 21a of the main pole plate 21 and the outer frame portion 21b, and the auxiliary pole plate 23 is covered from above with the touch of a lid. And the lower part of the pump chamber 7 is housed in a portion where the center hole of the auxiliary electrode plate 23 is opened, so that the main electrodes 22a, 22b, 22c and the auxiliary electrodes 24a, 24
Each of b and 24c is formed so as to surround the partition 10 of the pump chamber 7 at a predetermined angle. Although not shown, the storage container 1, the outlet pipe 2, the discharge port 3, the heater 9, the pump chamber inlet 17, and the pump chamber outlet 18 are formed in the same manner as in the first embodiment.

Next, the operation of the fourth embodiment will be described with reference to FIGS. Since the motor unit 4 is connected to a power supply, it is driven by operating means such as turning on a switch.
Main poles 22a, 22b, 22c which are stators of the motor unit 4
And the auxiliary poles 24a, 24b, 24c are arranged so as to surround the pump chamber 7 at a predetermined angle, so that the main poles 22a, 22b, 22c and the auxiliary poles 24a, 2c are arranged.
When the coils are wound around 4b and 24c, a magnetic field whose phase is advanced by an amount corresponding to the displacement is generated, and a moving magnetic field is formed. Therefore,
The moving magnetic field acts on the rotor 12 beyond the side surface 10c of the partition 10 of the pump chamber 7, and the rotor 12 as a permanent magnet is
It is dragged by the moving magnetic field, and rotates while its upper and lower sides are supported by the bearings 14a and 14b via the rotating shaft 13. Here, the centrifugal impeller (impeller) 5 is a motor unit 4
Are formed integrally with the rotor 12 of the
As a result, the centrifugal impeller (impeller) 5 also rotates. When the centrifugal impeller (impeller) 5 rotates, a water flow is generated in the same manner as described in the first embodiment, and water (hot water) in the pump chamber 7 is introduced into the water pipe 2 from the pump outlet 18. The water (hot water) in the water pipe 2 is pumped up above the water pipe 2, and the water (hot water) in the storage container 1 is pumped into the pump unit inlet 1.
7 sucks into the pump chamber 7. On the other hand, the pumped water (hot water) is discharged from the discharge port 3 to the outside of the device, and is used for drinking.

As described above, when a so-called multi-pole motor is applied, two or more synchronization phenomena become the same phase or a constant phase difference due to the interaction between them or the action of an external signal. The frequency matches the power supply frequency or an integer ratio thereof. Here, the main poles 22a, 22b, 22c, which are stators of the motor unit 4, and the auxiliary poles 24a, 24
Since b and 24c are arranged at an angle of 120 °, the rotation speed is 1/3 of the power supply frequency, but is a rotation speed more suitable for pumping liquid. In addition, this type of motor is small in size, and if the power supply frequency is constant, the number of rotations is an integer ratio, so that it is an inexpensive motor that can keep the oscillation frequency constant.

In the present invention, a permanent magnet is used for the rotor 12, which is a ferromagnetic material having a large residual magnetization and coercive force, and the intensity of the residual magnetization is not easily changed by external magnetic disturbance. . The material mainly used for the permanent magnet is K
S steel, MH steel, OP magnet, alnico, Sm-Co magnet and the like. This permanent magnet has high corrosion resistance due to liquid, and this pump device is used as an electric kettle and the rotor 1
Even when 2 is immersed in water (hot water), it has excellent water resistance, so that surface coating or the like is unnecessary. Furthermore, rotor 1
Due to the fact that the magnet 2 is a permanent magnet and that the magnetic coupling efficiency is not good, the coil 15 of the motor is wound with many thin wires to increase the impedance, so that the centrifugal impeller (impeller) 5 normally rotates. The current does not change in both the time and the lock, the abnormal current does not flow through the coil 15 of the electric motor, and the protection circuit is unnecessary.

Embodiment 5 FIG. 8 is a partial longitudinal sectional view of a main part of a pump device according to Embodiment 5 of the present invention. Embodiment 5 relates to a case where the pump device is applied to an electric kettle. In FIG. 8, reference numeral 4 denotes a shaded coil induction type electric motor unit which is connected to a power source and generates a driving force, and reference numeral 5 denotes a centrifugal impeller (impeller) which generates a water flow by rotating. Reference numeral 7 denotes a pump chamber which connects the storage container 1 and the water guide pipe 2 and communicates with the bottom of the storage container 1 on the suction side. Reference numeral 10 denotes a partition wall made of a non-magnetic material forming the pump chamber 7. The partition 10 is formed by an upper surface 10 of the partition.
a, a bottom surface portion 10b, and a side surface portion 10c. Reference numeral 11 denotes a stator of the motor unit 4, and 12 denotes a motor unit 4 in which a rotating shaft 13 is connected to a lower part of a centrifugal impeller (impeller) 5.
The rotator. The rotor 12 is disposed in the pump chamber 7 with the centrifugal impeller (impeller) 5 as an upper part. 14a
Is a bearing formed on a part of the bottom surface part 10b of the partition wall 10 surrounding the pump chamber 7 and receives the lower end of the rotary shaft 13. Reference numeral 14b is formed on a part of the upper surface part 10a of the partition wall 10 surrounding the pump chamber 7, and rotates. A bearing for receiving the upper end of the shaft 13. Reference numeral 15 denotes a motor coil, and reference numeral 16 denotes a shading coil provided on a part of the magnetic pole surface. Reference numeral 25 denotes a partition plate provided between the centrifugal impeller (impeller) 5 and the rotor 12. Rotary axis 1
The centrifugal impeller (impeller) 5, the partition plate 23, and the rotor 12 are fixed in this order via 3. The partition plate 25 is formed in such a size as to cover a portion of the side wall 10 c of the partition wall 10 sandwiched between the stator 11 and the rotor 12 from above. Although not shown, the storage container 1, the outlet pipe 2, the discharge port 3, the heater 9, the pump chamber inlet 17, and the pump chamber outlet 18 are formed in the same manner as in the first embodiment.

Next, the operation of the fifth embodiment will be described with reference to FIG. Water (hot water) in the pump chamber 7 is introduced from the pump chamber outlet 18 into the water pipe 2, and water (hot water) in the water pipe 2 is supplied to the water pipe 2.
And the water (hot water) in the storage container 1 is sucked into the pump chamber 7 from the pump chamber inlet 17. On the other hand, the pumped water (hot water) is discharged from the discharge port 3 to the outside of the device. Here, if foreign matter such as solidified organic matter in water or solidified calcium and clay is mixed in the storage container 1, the foreign matter is also mixed with water (hot water).
In the same manner as described above, it is sucked into the pump chamber 7 from the pump section inlet 17. When the foreign matter is caught between the rotor 12 and the side surface 10c of the partition 10, the rotation of the rotor 12 and the centrifugal impeller (impeller) 5 is locked. Therefore, since the partition plate 25 is provided between the centrifugal impeller (impeller) 5 and the rotor 12 so as to cover the lower part of the side surface of the partition 10, foreign substances do not fall directly, and the rotor 12 and the partition 10 It is not sandwiched between the side surface 10c. Therefore, it is possible to prevent the rotation of the rotor 12 from being locked. In particular, this is effective in a case where the rotor 12 does not rotate, the centrifugal impeller (impeller) 5 does not generate a water flow due to rotation, and foreign matter falls vertically.

Although the partition plate 25 is provided between the centrifugal impeller (impeller) 5 and the rotor 12 in the above description, the present invention is not limited to this, and the centrifugal impeller (impeller) 5 and the rotor Foreign matter in the liquid is removed from inside the pump chamber 7 by a filtering means such as a filter through which foreign matter in the liquid cannot pass during the rotation of the rotor 1.
2 and the side wall 10c of the partition wall 10 may not be sandwiched.

Embodiment 6 FIG. FIGS. 9 and 10 are partial longitudinal sectional views each showing a main part of a pump device according to Embodiment 6 of the present invention. Embodiment 6 relates to a case where the pump device is applied to an electric kettle. In FIGS. 9 and 10, reference numeral 4 denotes a shaded coil induction type electric motor unit which is connected to a power supply and generates a driving force, and reference numeral 5 denotes a centrifugal impeller (impeller) which rotates to generate a water flow. Reference numeral 7 denotes a pump chamber which connects the storage container 1 and the water guide pipe 2 and draws water (hot water) into the bottom of the storage container 1 and communicates with the pump chamber.
Is a partition made of a non-magnetic material. This partition 10
Are the upper surface portion 10a, the bottom surface portion 10b, and the side surface portion 10c of the partition wall.
It is composed of 11 is a stator of the motor unit 4;
Reference numeral 12 denotes a rotor of the electric motor unit 4 in which a rotating shaft 13 is connected to a lower part of the centrifugal impeller (impeller) 5. This rotor 12
Is disposed in the pump chamber 7 with the centrifugal impeller (impeller) 5 at the top. 14a is a bearing formed on a part of the bottom surface 10b of the partition 10 surrounding the pump chamber 7 and receiving the lower end of the rotating shaft 13; 14b is formed on a part of the upper surface 10a of the partition 10 surrounding the pump chamber 7; The bearing receives the upper end of the rotating shaft 13. Reference numeral 15 denotes a motor coil, and reference numeral 16 denotes a shading coil which is a short-circuit coil provided on a part of the magnetic pole surface. Reference numeral 26 denotes a compression spring provided around the bearing 14a of the rotor 12, and when the rotor 12 is not rotating, the rotor 1
2 is pushed upward by its elastic force. Reference numeral 27 denotes a stop wall provided on the upper part of the centrifugal impeller (impeller) 5 and formed so as to close the pump chamber inlet 17. Reference numeral 28 denotes a stop wall provided on the upper surface of the pump chamber 7 and the space of the storage container 1 together with the stop wall 27. It is a packing that blocks the space inside the pump chamber 7. Although not shown, the storage container 1, the outlet pipe 2, the discharge port 3,
The heater 9, the pump chamber inlet 17, and the pump chamber outlet 18 are formed in the same manner as in the first embodiment.

Next, the operation of the sixth embodiment will be described with reference to FIGS. The compression spring 26 provided around the bearing 14a at the lower part of the rotor 12 exerts an upward force due to its elastic force when the motor unit 4 is not driven, that is, when the rotor 12 is not rotating. Since the stop wall 27 provided on the upper part of the centrifugal impeller (impeller) 5 is connected to the rotating shaft 13 of the rotor 12, it is pressed upward. Therefore, the entrance from the storage container 1 to the pump chamber 7 is closed so that the packing 28 is crushed by the pressing force of the blocking wall 27, and the storage container 1
To prevent water (hot water) from flowing into the pump chamber 7. Also,
When the rotor 12 rotates, a magnetic field is generated, so that the rotor 12 is attracted to the center of the magnetic field, and is attracted downward by the magnetic force against the elastic force of the compression spring. 9, an inlet from the storage container 1 to the pump chamber 7 opens as shown in FIG. 9, and water (hot water) in the storage container 1 is sucked into the pump chamber 7.

Therefore, even if the electric kettle is tilted, the motor unit 4 is not turned on.
That is, when the rotor 12 is not rotating, the restraining wall 27 is pressed by the packing 28 by the elastic force of the compression spring 26 and the storage container 1
Since the hot water does not flow into the pump chamber 7, the hot water flows out of the discharge port 3 when the storage container is tilted, and does not cause burns. Water (hot water) remaining in the water pipe 2
However, due to the effect of the blocking wall 27, a negative pressure is generated when tilted, and the residual water in the water pipe 2 does not flow out.

In the above description, the rotor 12 is pushed up by the elastic force of the compression spring 26, and the packing 28 is crushed by the pressing force of the blocking wall 27 so that the packing 28 is crushed.
Although the inflow of the liquid from the container 1 to the pump chamber 7 is prevented by blocking the inlet to the pump, the present invention is not limited to this, and the elastic force of another elastic body such as rubber may be used. .

[0038]

As is apparent from the above invention, the pump device according to the present invention has a pump chamber in which a suction side inlet communicates with a container for storing a liquid, and the pump chamber has an impeller and a rotary shaft connected to the impeller. The rotor of the motor to which the rotor is connected is rotatably mounted, and the stator of the motor is disposed around the outer periphery of the pump chamber so as to face the rotor. As a result, a compact and highly reliable pump device can be provided. That is, the height of the device can be reduced, and in an application example such as an electric kettle, the height of the device itself is lowered, thereby lowering the position of the center of gravity, making it harder to fall down unexpectedly, and improving safety. Furthermore, since a commercial power supply can be used as a power supply, there is no need to use expensive components such as a rectifier, a smoothing capacitor, a low-voltage diode, and a dropper resistor as in the case of using a low DC potential as in the past. Therefore, it can be configured at very low cost.

In the pump device according to the present invention, the surface of the rotor is coated with a material having high corrosion resistance. As a result, even when the rotor is immersed in a liquid such as water, it has high corrosion resistance, does not corrode, can prevent iron rust, etc., and in an application example such as an electric kettle, the water is used for drinking. In this case, a device suitable for drinking can be provided.

Further, in the pump device according to the present invention, the surface of the rotor is subjected to a corrosion-resistant alumite treatment. As a result, even when the rotor is immersed in a liquid such as water, it has high corrosion resistance, does not corrode, can prevent iron rust, etc., and in an application example such as an electric kettle, the water is used for drinking. In this case, a device suitable for drinking can be provided. Further, it is possible to provide an apparatus which has higher reliability than a surface coating and can withstand long-term use.

The pump device according to the present invention uses a permanent magnet for the rotor. As a result, the overall height of the device can be reduced, and in an application example such as an electric kettle, the overall height of the device itself is reduced, thereby lowering the position of the center of gravity, making it difficult to fall unexpectedly, and improving safety. . Further, since the rotor is made of a permanent magnet, it has excellent corrosion resistance and does not require a coating on the surface. Furthermore, because the rotor is a permanent magnet and the configuration is originally inferior in magnetic coupling efficiency, even if the impeller is locked, no abnormal current flows through the winding, and a protection circuit is unnecessary. Furthermore, since a commercial power supply can be used as a power supply, there is no need to use expensive components such as a rectifier, a smoothing capacitor, a low-voltage diode, and a dropper resistor as in the case of using a low DC potential as in the past. Therefore, it can be configured at very low cost.

Also, in the pump device according to the present invention, the pump chamber has an impeller above and a rotor below, and at least the inner peripheral wall of the pump chamber and the rotor are between the impeller and the rotor. And a partition plate that covers the gap between them. As a result, a highly reliable pump device can be provided without foreign matter being mixed in the narrow space between the rotor and the partition wall and the rotation is not locked.

The pump device according to the present invention is provided with a pump chamber in which a suction side inlet is connected to a container containing a liquid, and the impeller and a rotor of a motor having a rotary shaft connected to the impeller are rotatable in the pump chamber. And a stator of an electric motor is disposed around the outer periphery of the pump chamber so as to face the rotor, and the rotor is provided so as to be movable in the axial direction, and the impeller blocks the suction-side inlet. It is provided that a wall is provided. As a result, when the rotor is not rotating, that is, when the electric motor is not driven, the liquid in the storage container does not flow out. Therefore, even when this apparatus is used as an electric kettle, hot water flows out and burns. There is no such thing. Further, at this time, since the space between the storage container and the pump chamber is closed, even if the device is tilted, a negative pressure is generated and the residual water in the water pipe does not flow out.

[0044]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pump device showing a configuration of a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating a main part of the pump device according to the first embodiment of the present invention.

FIG. 3 is a perspective view illustrating a main part of the pump device according to the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a rotor of a motor of a pump device showing a configuration of a third embodiment of the present invention.

FIG. 5 is a partial vertical sectional view of a pump device showing a configuration of a fourth embodiment of the present invention.

FIG. 6 is a perspective view of a main electrode plate of a motor of a pump device showing a configuration of a fourth embodiment of the present invention.

FIG. 7 is a perspective view of an auxiliary electrode plate of a motor of a pump device showing a configuration of a fourth embodiment of the present invention.

FIG. 8 is a partial longitudinal sectional view of a pump device showing a configuration of a fifth embodiment of the present invention.

FIG. 9 is a partial vertical sectional view of a pump device showing a configuration of a sixth embodiment of the present invention.

FIG. 10 is a partial vertical sectional view of a pump device showing a configuration of a sixth embodiment of the present invention.

FIG. 11 is a longitudinal sectional view of a conventional pump device.

[Explanation of symbols]

1 storage container, 2 water pipe, 3 discharge port, 4,
Motor part, 5 impeller, 6 non-magnetic partition,
7 pump room, 8a, 8b disk-shaped magnet, 9 heater, 10 pump room partition, 10a partition top surface, 10b partition bottom surface, 10c partition side surface, 1
1 stator, 12 rotors, 13 rotation axes, 14
a, 14b bearing, 15 motor coil, 16
Shading coil, 17 Pump chamber inlet, 18 Pump chamber outlet, 19 Direction of moving magnetic field, 20 Alumite layer, 21 Main electrode plate, 21a Planar part of main electrode plate,
21b Outer frame of main electrode plate, 22a, 22b, 22c
Main pole, 23 supplementary electrode plate, 23 '
24a, 24b, 24c Complementary electrode, 25 partition plate,
26 compression spring, 27 blocking wall, 28 packing.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tetsumasa Kubota 1728-1 Omaeda, Hanazono-cho, Osato-gun, Saitama F-term in Mitsubishi Electric Home Equipment Co., Ltd. (Reference) 4B055 AA34 BA16 BA28 BA35 CA02 CA16 CC04 CC38 CD58 CD61 FA14 FB17 FC12

Claims (6)

[Claims] A pump chamber in which a suction side inlet communicates with a container containing a liquid, wherein an impeller and a rotor of an electric motor having a rotary shaft connected to the impeller are rotatably mounted in the pump chamber; A pump device, wherein a stator of an electric motor is disposed around the outside of the chamber so as to face the rotor. 2. The pump device according to claim 1, wherein the surface of the rotor is coated with a material having high corrosion resistance. 3. The pump device according to claim 1, wherein a corrosion-resistant alumite treatment is applied to a surface of the rotor. 4. The pump device according to claim 1, wherein a permanent magnet is used for the rotor. 5. The pump chamber has an impeller above and a rotor below, and a partition plate between the impeller and the rotor that covers at least a gap between the inner peripheral wall surface of the pump chamber and the rotor. 5. An arrangement according to claim 1, wherein
The pump device according to any one of the above. 6. A pump chamber in which a suction side inlet communicates with a container containing a liquid, wherein an impeller and a rotor of an electric motor having a rotary shaft connected to the impeller are rotatably mounted in the pump chamber. A stator of an electric motor is disposed around the outer periphery of the chamber so as to face the rotor, and the rotor is provided so as to be movable in the axial direction, and a blocking wall for closing the suction side inlet is provided in the impeller. Characteristic pump device.