JP3446382B2 - Electric water heater with cooling function - 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 with a cooling function capable of obtaining cooling water.

[0002]

2. Description of the Related Art Conventionally, in order to drink cold safe drinking water, tap water is passed through a water purifier, boiled in a kettle, boiled, and then cooled to a certain extent by tap water to remove rough heat, and then a refrigerator. It was general to cool with.

[0003]

However, according to such a method, it is troublesome to boil tap water or to take away the rough heat of the boiled hot water with tap water. Further, when cooling water that has been cooled to some extent in a refrigerator, the cooling time in the refrigerator is, for example, 2 liters of rough heat.
It took 5 to 6 hours to cool the water at 10 ° C. to 10 ° C., and there was a problem that it took a long time to cool the usability.

Therefore, the electric water heater with a cooling function of the present invention solves these conventional problems, and sterilizes the tap water by putting it in a container and circulating it at a high temperature while removing defective components of the tap water. The first purpose is to prevent the dew condensation of the circulation pump for circulating the liquid in providing the cold and safe water after cooling.

A second object of the present invention is to improve the dimensional accuracy of the impeller bearings constituting the circulation pump to reduce the noise and extend the life of the circulation pump.

A third object is to extend the life of the circulation pump by the shape of the impeller which constitutes the circulation pump.

In addition, there is an impeller in the circulation pump.
A fourth object is to extend the life of the circulation pump by considering the positional relationship between the magnets and other magnets.

A fifth object of the present invention is to reduce the noise and extend the life of the circulation pump by the support structure of the support shaft for supporting the impeller of the circulation pump.

[0009]

A first invention for achieving the above first object is to provide a container for containing a liquid and a circulation for guiding the liquid in the container to the outside of the container and again to the inside of the container. A circulating pump, a switching means provided in the middle of the path by the circulating pump, a heating means provided in one circulation path of the switching means, and a purifying means for purifying the liquid heated by the heating means and introduced into the container, A cooling means provided in the other circulation path of the switching means, and the liquid is circulated by the circulation path of the heating means and the purifying means by the switching of the switching means for temperature rise purification, and the liquid is cooled by the circulation path of the cooling means. It has a cooling function to circulate and cool the motor.The structure of the circulation pump is to attach a magnet to the outer rotor of the brushless motor and attach it to the motor case. A magnet is fixed to the power transmission body through the wall of the power transmission body, another magnet is further fixed to the power transmission body, and an impeller having a magnet is positioned inside the pump case to magnetically couple with this magnet. This is an electric water heater with a cooling function in which a space between a motor case and a pump case in which a transmitter is located is sealed.

A second aspect of the present invention for achieving the second object is an electric water heater with a cooling function, which is formed by symmetrically combining two bearing members of the same shape as a bearing of an impeller.

A third invention for achieving the third object is to provide an electric water heater with a cooling function in which a plurality of through holes, notches or slits are provided in a part of the blade of the impeller.

[0012] A fourth object of the fourth invention for achieving the, in the arrangement of the magnet and the other magnet having impellers, the position on the motor side of the mug <br/> net having other magnet impeller This is an electric water heater with a cooling function that is shifted.

A fifth aspect of the present invention for achieving the fifth object is to provide an electric water heater with a cooling function, wherein a support shaft for rotatably supporting an impeller is movable in a radial direction.

[0014]

According to the first aspect of the present invention, tap water is put in the container, the circulation pump is operated to heat the water in the container by the heating means, and the purifying means is circulated to be contained in the tap water. Boiled water can be obtained while removing the defective components. The boiling water can be cooled to a predetermined temperature by switching the path by the switching means and circulating the cooling means, and it is possible to obtain delicious water that is cold and has no bad components, and circulate the liquid through the cooling means. When a motor-side magnet that transmits power to the impeller that constitutes the circulation pump is placed in the space of the sealed structure consisting of the pump case and the motor case when it is cooled to a predetermined temperature by the air flow in the space Since it does not, condensation can be eliminated on the pump case.

According to the second aspect of the invention, the bearings of the impeller are constructed by symmetrically combining two bearing members of the same shape, so that the contact portion with the support shaft can be molded in a short time, and can be removed during molding. Since the dimensional accuracy can be obtained without the need for a gradient, the dimensional accuracy of the support shaft and the bearing can be ensured, and the noise of the circulation pump can be reduced.

According to the third invention, by providing a plurality of through holes, notches or slits in a part of the blade of the impeller, it is possible to move in the thrust direction of the impeller due to the back pressure generated when the impeller rotates. Since the bearing of the impeller rotates without contact when the impeller rotates, the life of the circulation pump can be extended.

[0017] According to a fourth invention, in the arrangement of the Ma <br/> Gunetto other magnet having impellers, the other mug <br/> net shifting the position on the motor side of the magnet having the impeller By setting the impeller, movement in the thrust direction caused by back pressure due to rotation of the impeller is suppressed and the impeller rotates without contact, so that the life of the circulation pump can be extended.

According to the fifth aspect of the invention, since the support shaft of the impeller is movable in the radial direction, there is no contact wear between the support shaft and the bearing even when the rotation is eccentric.
The life of the circulation pump can be extended.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 and 2, reference numeral 1 denotes an exterior body of an electric water heater, which has a container 2 for containing a liquid therein. An upper lid 3 is provided to close the opening of the container 2 when closed, and is configured to open and close the upper portion of the exterior body 1. The container 2 has a heat insulating structure in which a heat insulating material 4 is provided on the outer side surface and the entire lower bottom surface. A circulation pump 5 and a hot water discharge pump 6 are provided at the bottom between the exterior body 1 and the container 2.

The liquid in the container 2 is guided from the bottom of the container 2 to the outside of the container 2 by the circulation pump 5, and is supplied to one of the paths of the switching means 8, that is, the heating means 9 including a heating boiler and the purifying means 10. Then, it is circulated through the circulation path again guided into the container 2 and purified by heating. Here, the purifying means 10 is filled with activated carbon, metal oxide, or the like that removes the chlorine component in the water. Next, by switching the switching means 8, the liquid in the container 2 is returned from the upper part of the container 2 while being circulated and cooled by circulating through the circulation path through the cooling means 11 having the Peltier element which is the other path. . In addition, each pipe 7, 7
a to 7d constitute a liquid circulation path.

Further, in order to take out the liquid in the container 2, the hot water discharge pump 6 can be driven to take it out from the spout 7f through the pipe 7e.

Next, the structure of the circulation pump 5 will be described. In FIGS. 3 and 4, a brushless motor 12 is attached to the motor case 13 by fixing an annular magnet 12b to the outer rotor 12a. And the magnet 1
The magnet 14a is fixed to the bottom of the cylindrical power transmission body 14 having a bottom through the wall of the motor case 13 so as to be magnetically coupled to the magnet 2b.
4b is fixed. And, as shown in FIGS. 4 and 5, an impeller 17 incorporating a magnet 17a is provided inside the pump case 15 so as to be magnetically coupled to the magnet 14b.
Is located.

Here, the shaft support portion 18a provided in a part of the pump case 18 and the shaft support portion 15a provided in a part of the pump case 15 prevent the support shaft 19 from rotating. The support shaft 19 is equipped with an impeller 17 rotatably in a free state in the thrust direction via a bearing 20 integrated with the impeller 17. The hole diameter of each of the shaft support portions 15a and 18a is larger than that of the support shaft 19 so that the support shaft 19 can move in the radial direction. Therefore, even if there is eccentric rotation of the power transmission body 14, the support shaft 19 and the bearing 20 move relative to each other in response to the rotation of the power transmission body 14, and thus the support shaft 19 and the bearing 20 slide. Dynamic wear is eliminated.

As shown in FIG. 7, the bearing 20 is integrally formed as the bearing 20 of the impeller 17 by symmetrically combining two bearing members of the same shape. Therefore, the bearing members of the same shape are symmetrically aligned and the impeller 1
Since the bearing 20 of No. 7 can be configured, the contact portion of the support shaft 19 can be molded with a short length. That is, when a single bearing having the same length as that shown in FIG. 7 is machined and formed, a draft is required. Dimensional accuracy can be secured and smooth rotation can be obtained. In addition, the container 2 is provided on the inner surface of the bearing 20.
Reservoir 20a in which the liquid inside enters as a lubricating liquid and collects
Is configured.

Further, by providing a plurality of through holes 22 in a part of the blade 21 of the impeller 17, it is possible to prevent the impeller 17 from moving in the thrust direction (upward direction) due to the back pressure generated when the impeller 17 rotates. Is something that can be done. Therefore, when the impeller 17 rotates,
The bearing 20 of the impeller 17 and the pump case 18 rotate without contact. Instead of the through hole 22, the blade 21 may be provided with a notch or a slit.

Next, the magnet 17a and the magnet 14
In the arrangement with b, the magnet 14b is replaced by the magnet 1
It is set below the dimension 7a by a dimension t (on the motor side) so that the impeller 17 is biased downward when the pump is stopped. By setting the position of the magnet 14b to be shifted from the magnet 17a to the motor side,
It is possible to suppress the movement in the thrust direction caused by the back pressure due to the rotation of the impeller 17, and this means also causes the bearing 20 of the impeller 17 and the pump case 18 to rotate in a non-contact state.

Reference numeral 23 is a packing for shutting off the air, which is located between the pump case 15 and the motor case 13, and which has the power transmission body 1
4 is present in the space 25 having a closed structure in which air does not flow. Since the space portion 25 has a closed structure and air does not flow around the power transmission body 14, dew condensation can be eliminated on the outer wall of the pump case 15. Numeral 24 is a packing for sealing the liquid, which is present between the pump case 18 and the pump case 15. Reference numeral 25 is a suction port of the pump, and 26 is a discharge port.

The operation of the electric water heater having the above construction will be described below. When tap water is put in the container 2 and the electric water heater is driven, first, the circulation pump 5 is activated, and the liquid is heated here through the pipe 7 through the switching means 8 and the heating means 9 to the water purification means 10. It enters, is purified, and is returned to the container 2 again. In this way, the liquid in the container 2 is circulated and purified, and is heated and boiled to remove chlorine and free chlorine contained in water. Then, when the predetermined time is reached, the switching means 8 is automatically switched to cool the boiled liquid by circulating it through the cooling means 11 and keep it at a constant temperature. Here, the cooling means 11 uses a plurality of Peltier devices, and the liquid is heat-exchanged to be cooled by energizing the devices.

As described above, since the circulation pump 5 is always operated both when the liquid is heated and when the liquid is cooled, a long life and quiet operation noise are required, and the bearing of the impeller 17 of the circulation pump 5 is required. 20 can move freely in both the radial direction and the thrust direction and has no sliding contact portion, so that no sliding noise is generated and continuous operation can be performed for a long time.

Further, according to this electric water heater with a cooling function, 2 liters of tap water is boiled to 100 ° C. and then cooled to 10 ° C. It takes about 3 hours with two 40 mm × 40 mm Peltier elements. We were able to.

In the embodiment, the control means (not shown) automatically controls the process from boiling to cooling of the liquid. However, it is also possible to control to obtain only boiling water.
It is also easy to control so that only cooling water is obtained. Further, in order to take out the liquid of either the boiling water or the cooling water in the container 2, by driving the hot water discharge pump 6,
It can be taken out from the spout 7f through the pipe 7e.

[0032]

As described above, according to the electric water heater with a cooling function of the first invention, the tap water is heated and purified,
And, it is possible to purify, boil, and cool with the cooling means, to make tap water more harmless, to obtain safe and delicious water, and to cool the liquid, the circulation pump configuration is divided into a pump case and a motor case. Since the space portion is made to have a closed structure so that air does not flow around the power transmission body, dew condensation can be eliminated on the outer wall of the pump case, and the life of the circulation pump can be extended.

According to the electric kettle with a cooling function of the second invention, the bearing member of the same shape is symmetrically matched to constitute the impeller bearing, so that the contact portion with the support shaft can be molded short. Dimensional accuracy can be obtained without the need for a draft. As a result, the dimensional accuracy of the support shaft and the bearing can be ensured, and the noise of the circulation pump can be reduced.

According to the electric water heater with cooling function of the third invention, a plurality of through holes are formed in a part of the blade of the impeller,
By providing the notch or slit, it is possible to suppress the movement of the impeller in the thrust direction due to the back pressure generated when the impeller rotates, and the impeller bearing itself rotates without contact during rotation of the impeller, resulting in a long service life. A circulation pump can be provided.

[0035] According to the cooling function electric water heater of the fourth aspect of the invention, shifting the arrangement of the magnet and the other magnet having impellers, a position other magnet motor side than <br/> magnet having impellers By installing the circulating pump, it is possible to suppress the movement in the thrust direction caused by the back pressure due to the rotation of the impeller, and to provide a long-life circulation pump.

According to the electric water heater with a cooling function of the fifth aspect of the invention, since the support shaft is movable in the radial direction, the power transmission body can rotate even when the impeller rotational balance is deviated. Accordingly, since the support shaft moves relatively, it is possible to provide a long-life circulation pump without wear of the support shaft and the bearing.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric water heater with a cooling function according to an embodiment of the present invention.

FIG. 2 is a top sectional view of the electric water heater.

FIG. 3 is a top view of a circulation pump equipped in the electric water heater.

FIG. 4 is a vertical sectional view of the circulation pump.

FIG. 5 is a top view showing an impeller of the circulation pump.

FIG. 6 is a vertical sectional view of the impeller.

FIG. 7 is a vertical sectional view showing a bearing of the impeller.

[Explanation of symbols]

2 containers 5 circulation pumps 8 switching means 9 Heating means 10 Purification means 11 Cooling means 12 brushless motor 13 motor case 14 Power transmission 15 pump case 17 Impeller 18 pump case 19 Support shaft 20 bearings 21 blade

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kaoru Maekawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-5-285045 (JP, A) JP-A-6- 70850 (JP, A) JP 6-154087 (JP, A) JP 5-103724 (JP, A) JP 6-74184 (JP, A) JP 5-149288 (JP, A) JP-A-5-10287 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47J 27/21

Claims (5)

(57) [Claims] 1. A container for storing a liquid, a circulation pump for circulating the liquid in the container to the outside of the container and to the inside of the container again, and a switching means provided in the middle of the path by the circulation pump, and this switching. The heating means provided in one circulation path of the means, the purification means for purifying the liquid heated by the heating means and introduced into the container, and the cooling means provided in the other circulation path of the switching means, The switching pump has a cooling function that circulates the liquid through the circulation path of the heating means and the purification means to perform temperature rise purification, and has a cooling function that circulates and cools the liquid through the circulation path of the cooling means.The circulation pump has a magnet on the outer rotor of the brushless motor. Is fixed to the motor case and attached to the motor case, and the magnet is fixed to the bottom of the power transmission body through the wall of the motor case to magnetically couple with this magnet. Cooling by fixing another magnet, placing an impeller with a magnet inside the pump case to magnetically couple with this magnet, and sealing the space between the motor case where the power transmission body is located and the pump case. Electric water heater with functions. 2. The electric water heater with a cooling function according to claim 1, wherein two bearing members having the same shape are symmetrically combined to form a bearing for an impeller. 3. The electric water heater with a cooling function according to claim 1, wherein a plurality of through holes, notches or slits are provided in a part of the blade of the impeller. 4. A disposition of the magnet and the other mug <br/> net impeller has, with cooling function according to claim 1, wherein comprising shifting the position on the motor side of the magnet having the other magnet the impeller Electric water heater. 5. The electric water heater with a cooling function according to claim 1, wherein a support shaft for rotatably supporting the impeller is movable in the radial direction.