JP2002130176A - Hot water supply pump for electric pot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply pump for an electric pot for reducing contact resistance with a pump chamber of an impeller rotatably arranged in the pump chamber and reducing electric power consumption of a motor for driving the impeller. SOLUTION: In this electric pot for arranging the pump chamber 2 in a pipe 32 for delivering hot water to a hot water port 3 from a tank 31 for storing the hot water by boiling water, and rotatably arranging the impeller 4 driven by the motor 7 in the pump chamber 2, an impeller end surface 5 orthogonal to the rotational axis direction is arranged in one end part in the rotational axis direction of the impeller 4. An opposed surface 6 is arranged on an inside surface of the pump chamber 2 opposed to the impeller end surface 5. Rollingly contacting plural balls 1 are arranged between the impeller end surface 5 and the opposed surface 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply pump for an electric pot, and more particularly, to an arrangement of an impeller rotatably provided in a pump chamber.

[0002]

2. Description of the Related Art Conventionally, as a general structure of an electric pot, as shown in FIG. 8, a tank 31 for boiling and storing hot water is provided inside an electric pot body 30, and hot water is supplied from the tank 31 to the hot water. A pipe 32 extending to the mouth 3 is provided, and a hot water supply pump P for delivering hot water stored in the tank 31 to the hot water supply port 3 in the pipe 32 is provided.

FIG. 7 shows a hot water supply pump P for this electric pot. In this hot water supply pump for an electric kettle, a pump chamber 2 is arranged in a pipe 32 for delivering hot water from a tank 31 for boiling and storing hot water to a hot water supply port 3, and a motor chamber 12 is provided in the pump chamber 2 with a non-magnetic material. Plate-shaped partition wall 1 formed of
Adjacent via 3 A motor 7 driven by electric power is disposed in the motor chamber 12, and a drive magnet 19 is mounted on a motor drive shaft 14 extending from the motor 7 in the direction of the pump chamber 2. An impeller 4 is rotatably disposed in the pump chamber 2, and a rotating shaft 25 is provided so as to extend to both ends of the impeller 4 in the direction of the rotating shaft, and one end 25 a of the rotating shaft 25 is attached to bearings 26 a and 27 a. In addition to being rotatably inserted, the other end 25b of the rotating shaft 25 is rotatably inserted into the bearings 26b and 27b. Here, the other end 25b of the rotating shaft 25 and the bearings 26b and 27b are located in the direction of the motor chamber 12 of the impeller 4, and the one end 25
a and the bearings 26a, 27a are located in the opposite direction to the motor chamber 12, and the bearings 26a, 26b receive a radial load (arrow B in the figure) generated on the rotating impeller 4, and are bearings 27a, 27b. Is the rotation axis 25
Is positioned in the pump chamber 2. The bearings 26a, 26b, 27a, 27b are in sliding contact with the rotating shaft 25. A driven magnet 20 is mounted on the end face of the impeller 4 on the side of the motor chamber 12 in the direction of the rotation axis. The driving magnet 19 of the motor driving shaft 14 and the driven magnet 20 of the impeller 4
Are opposed to each other with the plate-like partition 13 positioned therebetween, and the driving magnet 19 and the driven magnet 20
Means that a magnetic coupling is formed, and the impeller 4 is rotationally driven via the magnetic coupling by rotating the motor 7. Hot water is delivered from the tank 31 to the hot water supply port 3 through the pipe 32 by the rotating impeller 4.

[0004]

As described above, when the electric pot is driven, the driving magnet 19 and the driven magnet 20 constituting the magnetic coupling are attracted to each other, so that the impeller 4 moves in the direction of the motor chamber 12. It rotates while being urged in the direction of the motor chamber 12 by receiving a thrust load (arrow A in the figure). At this time, the other end 25b of the rotating shaft 25 of the impeller 4 urged by the thrust load (arrow A in the figure) is pressed against the bearing 27b,
The contact between the other end 25b of the rotating shaft 25 and the bearing 27b is made stronger, and accordingly, the contact resistance of the sliding contact between the rotating shaft 25 of the impeller 4 and the bearing 27b is increased. It is. In the hot water supply pump for an electric pot having the above structure, the rotating impeller
The motor 7 is overloaded with an increase in the contact resistance between the rotary shaft 25 and the bearing 27b.
However, there is a problem that power consumption increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has an electric pot in which the contact resistance between an impeller rotatably provided in a pump chamber and a pump chamber is reduced, and the power consumption of a motor for driving the impeller is reduced. It is an object of the present invention to provide a hot water supply pump.

[0006]

According to a first aspect of the present invention, there is provided a pump for supplying hot water to a hot water supply port from a tank for boiling and storing hot water. In the electric pot in which the pump chamber 2 is disposed in the passage 32 and the impeller 4 driven by the motor 7 is rotatably disposed in the pump chamber 2, one end of the impeller 4 in the rotational axis direction is provided with the rotational axis direction. The pump chamber 2 is provided with an impeller end face 5 perpendicular to the impeller end face 5.
Of the impeller end surface 5 and the opposing surface 6
And a plurality of balls 1 that are in rolling contact with each other. Thereby, one end of the impeller 4 in the rotation axis direction is caused to face the impeller end face 5 perpendicular to the rotation axis direction and the opposing face 6 of the inner surface of the pump chamber 2, and the impeller end face 5 and the opposing face 6 are opposed to each other. Multiple balls 1 between
Is arranged, the plurality of balls 1 make rolling contact with the impeller end face 5 and the opposing face 6, and the contact resistance between the impeller end face 5 and the opposing face 6 of the rotated impeller 4. Can be reduced, the rotation of the impeller 4 can be performed smoothly, and therefore, the power consumption of the motor 7 can be reduced without overloading the motor 7 that drives the impeller 4 to rotate. It is.

Further, in the hot water supply pump for an electric pot according to claim 2 of the present invention, in the first aspect, the opposed surface 6 and the impeller end surface 5 are each provided with an annular ball receiving groove 8 having the same center and the same diameter. A plurality of balls 1 which are recessed and are in rolling contact between the opposing ball receiving grooves 8 and 8 are arranged, and the plurality of balls 1 are kept in order to keep the distance between adjacent balls 1 of the plurality of balls 1 constant. Characterized in that the ball 1 is held in a holder 9. As a result, the plurality of balls 1 are rollably and movably engaged with the ball receiving grooves 8, 8, so that the position of the rotation axis of the impeller 4 is fixed and the impeller 4 is fixed to the pump chamber 2. The impeller 4 can be arranged, and the plurality of balls 1 are held in a retainer 9 in order to keep the distance between the adjacent balls 1 constant. It is possible to prevent the plurality of balls 1 arranged in the inner space from being positioned close to each other in the ball receiving groove 8, and to ensure the stable rotation of the impeller 4.

According to a third aspect of the present invention, there is provided an electric pot hot water supply pump according to the first aspect, wherein an annular ball receiving groove 8 is formed in one of the opposed surface 6 and the impeller end surface 5. A circular flat surface 10 having the same center and the same outer diameter as the ball receiving groove 8 is recessed at a position of the opposing surface 6 or the impeller end surface 5 where the other ball receiving groove 8 is opposed, and the opposing ball receiver is formed. A plurality of balls 1 that are in rolling contact between the groove 8 and the flat surface 10 are arranged, and the plurality of balls 1 are held by a cage 9 in order to maintain a constant distance between adjacent ones of the plurality of balls 1. Characterized in that the Thus, the plurality of balls 1 are rollably and movably engaged with the ball receiving groove 8 and the flat surface 10 so that the position of the rotation axis of the impeller 4 is fixed and the impeller 4 is fixed. Can be arranged in the pump chamber 2, and the plurality of balls 1 are held in a holder 9 in order to keep the distance between the adjacent balls 1 constant.
, It is possible to prevent a plurality of balls 1 arranged in the ball receiving groove 8 from being positioned close to each other and to be positioned at a deviated position in the ball receiving groove 8, thereby ensuring stable rotation of the impeller 4. Is what you can do.

According to a fourth aspect of the present invention, in the hot water supply pump for an electric pot according to the first aspect, the plurality of ball receiving recesses 11 are spherically formed on one of the facing surface 6 and the impeller end surface 5. An annular ball receiving groove 8 is formed in the other of the opposing surface 6 and the impeller end surface 5 so that the ball receiving recess 11 is opposed to the ball receiving groove 11, and rolling is performed between the ball receiving recess 11 and the ball receiving groove 8. The present invention is characterized in that the contacting balls 1 are arranged in the respective ball receiving recesses 11. As a result, the balls 1 arranged in each of the ball receiving recesses 11 are rollably and movably engaged with the annular ball receiving groove 8 so that the position of the rotation axis of the impeller 4 is fixed. The impeller 4 can be arranged in the pump chamber 2 by means of a pump.
By disposing the impeller 4 at a substantially symmetrical position with respect to the rotation axis, stable rotation of the impeller 4 can be ensured.

According to a fifth aspect of the present invention, there is provided an electric pot hot water supply pump according to the first aspect, wherein a plurality of ball receiving recesses are provided on one of the facing surface 6 and the impeller end surface 5 in a spherical shape. Places 11 in a circumferential shape, and
Alternatively, a circular flat surface 10 having the same center as the arrangement circle of the plurality of ball receiving recesses 11 is recessed in the other of the impeller end surfaces 5, and an outer diameter portion of the flat surface 10 and the ball receiving recess 11 are formed. Oppose, the ball receiving recess 11 and the flat surface 1
0 and the ball 1 which is in rolling contact with the ball receiving recess 1
It is characterized by being arranged every one. Accordingly, the balls 1 arranged in the respective ball receiving recesses 11 are slidably and movably engaged with the flat surface 10 so that the position of the rotation axis of the impeller 4 is fixed and the pump chamber is fixed. 2. The impeller 4 can be arranged on the second impeller 2, and the plurality of ball receiving recesses 11 are arranged at substantially symmetric positions with respect to the rotation axis of the impeller 4, thereby ensuring stable rotation of the impeller 4. Can be done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

FIGS. 1 and 2 show an embodiment of the present invention. In this example, a pump chamber 2 is arranged in a pipe 32 for delivering hot water from a tank 31 (FIG. 8) for boiling and storing hot water to a hot water supply port 3, and this pump chamber 2 is formed of a non-magnetic material. The motor chamber 12 is adjacent via the plate-shaped partition 13 formed. A motor 7 driven by electric power is disposed in the motor chamber 12, and a drive magnet 19 is mounted on a motor drive shaft 14 extending from the motor 7 in the direction of the pump chamber 2. The motor 7 is installed in the motor chamber 12 via a screw 21. Here, reference numeral 24 denotes an O-ring for making the connection between the motor chamber 12 and the pump chamber 2 watertight.

On the other hand, an impeller 4 is rotatably arranged in the pump chamber 2. The impeller 4 has a central axis 16 protruding from one end face of a disk 15 orthogonal to the axis of rotation on the axis of rotation of the disk 15 and a number of blades 17 provided between the center axis 16 and the disk 15. Further, the disk 15 is formed by attaching the driven magnet 20 to the other end surface of the disk 15. The impeller 4 has an end face on which the driven magnet 20 of the disk 15 is mounted facing the plate-shaped partition wall 13, and a rotation axis and a center axis 16 thereof are positioned on an axial extension of the motor drive shaft 14. It is arranged in the chamber 2. Here, the end face of the disk 15 facing the plate-like partition 13 constitutes the impeller end face 5 and the plate-like partition 1
The portion where the impeller 4 of 3 opposes constitutes the opposing surface 6. Note that, in this example, the impeller end face 5 is
5 is provided with a circular recess 22 centered on the axis of rotation of the impeller 4, and a disc-shaped bush 2 is provided in the circular recess 22.
3 are formed by fitting. The impeller 4 disposed in the pump chamber 2 has a plurality of balls 1 that are in rolling contact between the impeller end face 5 and the opposing face 6 and a center shaft 16 having a tip formed on the inner surface of the pump chamber 2. By being supported by the support 18, the pump 18 is rotatably disposed in the pump chamber 2.

The structure between the impeller end face 5 and the opposing face 6 will be described in detail. As shown in FIG. 2, the opposing face 6 and the impeller end face 5 have the same diameter around the rotation axis of the impeller 4 respectively. An annular ball receiving groove 8 is recessed in a semicircular longitudinal section, and a plurality of balls 1 which are in rolling contact between the opposing ball receiving grooves 8, 8 are arranged. Further, the plurality of balls 1 are integrally connected by a retainer 9 for maintaining a distance between adjacent balls.

As described above, the impeller 4 disposed in the pump chamber 2 is driven to rotate by the motor 7. The driven magnet 20 and the driving magnet 19 which face each other with the plate-like partition 13 interposed therebetween. These constitute a magnetic coupling, and the motor 7 is rotationally driven to thereby rotationally drive the impeller 4 via the magnetic coupling. The rotating impeller 4 delivers hot water from the tank 31 to the hot water supply port 3.

At this time, the rotating impeller 4 is biased in the direction of the motor chamber 12 by the magnetic coupling, and the impeller 4 attempts to come closer to the motor chamber 12 from a normal arrangement position. , Impeller end face 5
A thrust load (arrow A in the figure) is applied between the first and second surfaces 6 and 6. In this example, as described above, a plurality of balls 1 are arranged between the impeller end surface 5 and the opposing surface 6, and the plurality of balls 1 are in rolling contact with the impeller end surface 5 and the opposing surface 6. Therefore, even under the influence of the above-mentioned thrust load (arrow A), the contact resistance between the impeller end face 5 and the opposing face 6 can be kept small, and the rotation of the impeller 4 can be performed smoothly.
Without overloading the motor 7 for rotating the
The power consumption of the motor 7 can be reduced. The rotating impeller 4 may receive a radial load (arrow B in the drawing) that causes the rattling of the rotation, but in this example, the plurality of balls 1 roll into the two ball receiving grooves 8. By freely and movably engaging, the impeller 4 can be disposed in the pump chamber 2 with the position of the rotation axis of the impeller 4 kept constant even under the influence of the radial load (arrow B). . In addition, since the plurality of balls 1 are held in the retainer 9 in order to keep the distance between the adjacent balls 1 constant, the plurality of balls 1 arranged in the ball receiving groove 8 become Since it is prevented from being located close to the biased position in the ball receiving groove 8, stable rotation of the impeller 4 is ensured.

Hereinafter, another example of the embodiment will be described. In the other examples of the following embodiments, the structure between the impeller end face 5 and the opposing face 6 of the example of the above embodiment is changed, and the description of the overlapping parts will be omitted and the differences will be described. I will.

Another example of the embodiment shown in FIG.
An annular ball receiving groove 8 centering on the rotation axis of the impeller 4 is recessed in a semicircular longitudinal section.
A circular flat surface 10 having a center about the rotation axis of the impeller 4 and having an outer diameter substantially the same as the outer diameter of the ball receiving groove 8 is recessed between the opposed ball receiving groove 8 and the flat surface 10. A plurality of balls 1 that are in rolling contact with
This is an example in which a plurality of balls 1 are held in a holder 9 in order to keep the distance between adjacent balls 1 constant. Also according to this example, between the flat surface 10 of the impeller end surface 5 and the ball receiving groove 8 of the opposing surface 6, that is, between the impeller end surface 5 and the opposing surface 6, that is, between the impeller end surface 5 and the opposing surface 6. Since a plurality of balls 1 that are in rolling contact with each other are arranged, the contact resistance between the impeller end face 5 and the opposing face 6 can be reduced even under the influence of a thrust load (arrow A in the figure), and the impeller 4 Can be smoothly performed, and therefore, the power consumption of the motor 7 can be reduced without overloading the motor 7 for driving the impeller 4 to rotate. Further, since the plurality of balls 1 are rollably and movably engaged with the ball receiving groove 8 and the flat surface 10,
The impeller 4 can be arranged in the pump chamber 2 with the position of the rotation axis of the impeller 4 constant even under the influence of the radial load (arrow B in the figure). By holding the plurality of balls 1 in the retainer 9 in order to keep the distance constant, the plurality of balls 1 arranged in the ball receiving groove 8 come close to each other, and
It is possible to prevent the impeller 4 from being located at a skewed position, and to ensure a stable rotation of the impeller 4.

Another example of the embodiment shown in FIG. 4 is shown in FIG.
Ball receiving groove 8 and flat surface 10
Are provided between the impeller end surface 5 and the opposing surface 6. Specifically, the impeller end surface 5 has an annular ball receiving groove 8 centered on the rotation axis of the impeller 4. Is recessed in a semicircular vertical section, and a circular flat surface 10 having the same outer diameter as the outer diameter of the ball receiving groove 8 and the center of the rotation axis of the impeller 4 is formed in the opposing surface 6. A plurality of balls 1 that are in rolling contact between the opposed ball receiving grooves 8 and the flat surface 10, and the distance between the adjacent balls 1 of the plurality of balls 1 is kept constant. This is an example in which a plurality of balls 1 are held in a holder 9. In this example, the same operation and effect as those of the other example of the embodiment shown in FIG. 3 can be obtained.

Another example of the embodiment shown in FIG.
A plurality of ball receiving recesses 11 formed in a spherical shape are arranged on a circumference centered on a rotation axis, and an annular ball receiver is formed so that the ball receiving recesses 11 face the impeller end face 5. The groove 8 is recessed in a semicircular longitudinal section, and the ball receiving recess 1
This is an example in which the balls 1 which are in rolling contact between the ball receiving grooves 1 and the ball receiving grooves 8 are arranged in the respective ball receiving recesses 11. Also in this example, a plurality of balls 1 that are in rolling contact between the ball receiving groove 8 of the impeller end face 5 and the ball receiving recess 11 of the opposing face 6, that is, between the impeller end face 5 and the opposing face 6 are arranged. Therefore, even under the influence of the thrust load (arrow A in the figure), the contact resistance between the impeller end face 5 and the opposing face 6 can be reduced, and the rotation of the impeller 4 can be performed smoothly. The power consumption of the motor 7 can be reduced without overloading the motor 7 for driving the impeller 4 to rotate. In addition, the balls 1 arranged in the respective ball receiving recesses 11 are each formed in an annular shape. It is rollingly and movably engaged with the ball receiving groove 8 and can be disposed in the pump chamber 2 with the position of the rotation axis of the impeller 4 constant even under the influence of a radial load (arrow B in the figure). There also, by arranging the substantially symmetrical positions a plurality of ball receiving recess 11 with respect to the rotation axis of the impeller 4, in which it is possible to secure stable rotation of the impeller 4. Note that, as in the relationship between the example of FIG. 3 and the example of FIG.
The same operation and effect as in the present embodiment can be obtained even if the member provided with the ball receiving groove 8 and the ball receiving recess 11 is reversed between the impeller end face 5 and the opposing face 6.

Another example of the embodiment shown in FIG.
A plurality of ball receiving recesses 11 which are concavely formed in a spherical shape are arranged circumferentially around the rotation axis, and are arranged on the impeller end face 5 at the same center as the arrangement circle of the plurality of ball receiving recesses 11. A circular flat surface 10 having the center of the rotation axis of a certain impeller 4 as a center is recessed, and the ball receiving recess 11 faces the outer diameter portion of the flat surface 10, and is flat with the ball receiving recess 11. This is an example in which balls 1 that are in rolling contact with a surface 10 are arranged for each ball receiving recess 11. Also in this example, a plurality of balls 1 that are in rolling contact between the flat surface 10 of the impeller end surface 5 and the ball receiving recess 11 of the opposing surface 6, that is, between the impeller end surface 5 and the opposing surface 6 are arranged. Therefore, even under the influence of the thrust load (arrow A in the figure), the contact resistance between the impeller end face 5 and the opposing face 6 can be reduced, and the rotation of the impeller 4 can be performed smoothly. The power consumption of the motor 7 can be reduced without overloading the motor 7 for driving the impeller 4 to rotate, and the ball receiving recess 11 has a circular shape centered on the rotation axis. The plurality of ball receiving recesses 11 are opposed to each other over an outer diameter portion of the flat surface 10 formed in a recessed manner, and the ball 1 arranged for each ball receiving recess 11 is disposed on the flat surface 10. 0, respectively, so that the plurality of balls 1 can freely roll and move on the peripheral wall of the outer diameter portion of the recessed flat surface 10, respectively. By freely contacting, that is, the plurality of balls 1 are rollingly and movably engaged with the flat surface 10, and the rotation of the impeller 4 even under the influence of a radial load (arrow B in the figure). The impeller 4 can be arranged in the pump chamber 2 while keeping the position of the shaft center constant. Further, by arranging the plurality of ball receiving recesses 11 at substantially symmetric positions with respect to the rotation shaft center of the impeller 4, Thus, stable rotation of the impeller 4 can be ensured. Note that, as in the relationship between the example of FIG. 3 and the example of FIG. 4, a member in which the flat surface 10 and the ball receiving recess 11 are provided between the impeller end surface 5 and the opposing surface 6 is reversed. The same operation and effect as described above can be obtained.

[0022]

As described above, in the pump for hot water supply of the electric pot according to the first aspect of the present invention, the pump chamber is disposed in a pipe for delivering hot water from a tank for boiling and storing hot water to a hot water supply port. In the electric pot in which the impeller driven by a motor is rotatably arranged in the pump chamber, an impeller end face orthogonal to the rotation axis direction is provided at one end of the impeller in the rotation axis direction, and the impeller end face is provided with the impeller end face. Since the inner surface of the opposed pump chamber is an opposing surface, and a plurality of balls that are in rolling contact between the impeller end surface and the opposing surface are arranged,
At one end of the impeller in the direction of the rotation axis, the impeller end face perpendicular to the rotation axis direction and the opposing face of the inner surface of the pump chamber are opposed to each other, and a plurality of balls are placed between the impeller end face and the opposing face. Because of the arrangement, the plurality of balls are in rolling contact with the impeller end face and the opposing face, and the contact resistance between the impeller end face and the opposing face of the rotated impeller can be reduced, The rotation of the impeller can be performed smoothly, and therefore, the power consumption of the motor can be reduced without overloading the motor that drives the impeller to rotate.

According to a second aspect of the present invention, there is provided a hot water supply pump for an electric pot, in addition to the effects of the first aspect,
An annular ball receiving groove having the same center and the same diameter is recessed in each of the opposing surface and the impeller end surface, and a plurality of balls in rolling contact are arranged between the opposing ball receiving grooves. In order to keep the distance between adjacent balls constant, the above balls were held in a cage,
Since the plurality of balls are slidably and movably engaged with the ball receiving grooves, the impeller can be arranged in the pump chamber with the position of the rotation axis of the impeller kept constant. In addition, since a plurality of balls are held by the retainer in order to keep the distance between adjacent balls of the plurality of balls constant, the plurality of balls arranged in the ball receiving groove come close to each other and are located in the ball receiving groove. Is prevented from being located at a biased position, and stable rotation of the impeller can be ensured.

According to a third aspect of the present invention, there is provided a pump for hot water supply of an electric pot, in addition to the effects of the first aspect,
An annular ball receiving groove is recessed in one of the opposing surface or the impeller end surface, and substantially coaxial with the ball receiving groove at a position where the other ball receiving groove opposes the opposing surface or the impeller end surface. Concave a circular flat surface of diameter,
A plurality of balls in rolling contact were arranged between the opposing ball receiving grooves and the flat surface, and the plurality of balls were held in a retainer in order to maintain a constant distance between adjacent balls. Since the plurality of balls are slidably and movably engaged with the ball receiving grooves and the flat surface, the impeller can be disposed in the pump chamber with the position of the rotation axis of the impeller kept constant. Things,
In addition, since a plurality of balls are held by the retainer in order to keep the distance between adjacent balls of the plurality of balls constant, the plurality of balls arranged in the ball receiving groove come close to each other and are located in the ball receiving groove. Is prevented from being located at a biased position, and stable rotation of the impeller can be ensured.

According to a fourth aspect of the present invention, there is provided a pump for hot water supply of an electric pot, in addition to the effects of the first aspect,
A plurality of ball receiving recesses are formed in a spherical shape on one of the facing surface or the impeller end surface, and an annular ball receiving groove in which the ball receiving recess faces the other of the facing surface or the impeller end surface. The balls that are in rolling contact between the ball receiving recesses and the ball receiving grooves are arranged in each of the ball receiving recesses, so that the balls arranged in each of the ball receiving recesses can freely roll into the annular ball receiving groove. In addition, since the impeller is movably engaged, the impeller can be arranged in the pump chamber with the position of the rotation axis of the impeller being fixed, and a plurality of ball receiving recesses can be formed in the rotation axis of the impeller. , A stable rotation of the impeller can be ensured.

According to a fifth aspect of the present invention, there is provided a hot water supply pump for an electric pot, in addition to the effects of the first aspect,
A plurality of ball receiving recesses recessed in a spherical shape on one of the opposing surface or the impeller end surface are circumferentially arranged, and an arrangement circle of a plurality of ball receiving recesses on the other of the opposing surface or the impeller end surface. Concave circular flat surface concentric with
Since the outer diameter portion of the flat surface and the ball receiving recess face each other, and balls that are in rolling contact between the ball receiving recess and the flat surface are arranged in each ball receiving recess, each ball receiving recess has Since the arranged balls are slidably and movably engaged with the flat surface, the impeller can be arranged in the pump chamber while the position of the rotation axis of the impeller is kept constant. Since the ball receiving recesses are arranged substantially symmetrically with respect to the rotation axis of the impeller, stable rotation of the impeller can be ensured.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an example of an embodiment of the present invention.

FIGS. 2A and 2B show a structure between an impeller end face of the impeller and an opposing face of a plate-like partition, wherein FIG. 2A is a side view, FIG. 2B is a top view, and FIG. It is a bottom view.

FIG. 3 shows a structure between an impeller end surface of an impeller according to another example of the embodiment and an opposing surface of a plate-like partition wall;
(A) is a side view, (b) is a top view, (c)
Is a bottom view.

FIG. 4 shows a structure between an impeller end face of an impeller of still another example of the embodiment and an opposing face of a plate-like partition,
(A) is a side view, (b) is a top view, (c)
Is a bottom view.

FIG. 5 shows a structure between an impeller end face of an impeller according to still another example of the embodiment and an opposing face of a plate-like partition wall,
(A) is a side view, (b) is a top view, (c)
Is a bottom view.

FIG. 6 shows a structure between an impeller end face of an impeller according to still another embodiment of the present invention and an opposing face of a plate-like partition wall;
(A) is a side view, (b) is a top view, (c)
Is a bottom view.

FIG. 7 is a side sectional view showing a conventional technique.

FIG. 8 is a schematic sectional view showing a structure of a general electric pot.

[Explanation of symbols]

 Reference Signs List 1 ball 2 pump chamber 3 hot water supply port 4 impeller 5 impeller end face 6 facing surface 8 ball receiving groove 9 retainer 13 plate-shaped partition wall 22 circular recess 23 bush

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masato Nagai 1048 Kazuma Kadoma, Kadoma-shi, Osaka F-term in Matsushita Electric Works, Ltd. (reference) 3H022 AA01 BA06 CA12 CA15 CA17 CA19 DA00

Claims (5)

[Claims] 1. An electric pot in which a pump chamber is arranged in a pipeline for delivering hot water from a tank for boiling and storing hot water to a hot water supply port, and an impeller driven by a motor is rotatably arranged in the pump chamber. An impeller end face perpendicular to the rotation axis direction is provided at one end in the rotation axis direction,
A hot water supply pump for an electric pot, wherein an inner surface of a pump chamber facing the impeller end surface is an opposing surface, and a plurality of balls that are in rolling contact are arranged between the impeller end surface and the opposing surface. 2. An annular ball receiving groove having the same center and the same diameter is recessed in each of the opposing surface and the impeller end surface, and a plurality of balls that are in rolling contact are arranged between the opposing ball receiving grooves. 2. The hot water supply pump for an electric pot according to claim 1, wherein the plurality of balls are held by a holder in order to keep a distance between adjacent balls of the plurality of balls constant. 3. An annular ball receiving groove is formed in one of the opposing surface and the impeller end face, and the annular ball receiving groove is formed in a position facing the other ball receiving groove in the opposing face or the impeller end face. At the center, a circular flat surface with approximately the same outer diameter is recessed, and a plurality of balls that are in rolling contact between the opposing ball receiving grooves and the flat surface are arranged, and the distance between adjacent balls of the plurality of balls 2. The pump for hot water supply of an electric pot according to claim 1, wherein the plurality of balls are held by a holder in order to keep a constant value. 4. An annular shape in which a plurality of ball receiving recesses are formed in a spherical shape on one of the opposed surface or the impeller end surface, and the ball receiving recess is opposed on the other of the opposed surface or the impeller end surface. 2. A pump for hot water supply of an electric pot according to claim 1, wherein a ball receiving groove is formed in a recess, and balls which are in rolling contact between the ball receiving groove and the ball receiving groove are arranged in each ball receiving groove. 5. A plurality of ball receiving recesses which are concavely formed in a spherical shape on one of the opposing surface and the impeller end surface, and are arranged circumferentially, and a plurality of ball receiving members are provided on the other of the opposing surface and the impeller end surface. A circular flat surface having the same center as the arrangement circle of the recess is recessed, and the outer diameter portion of the flat surface and the ball receiving recess face each other, and rolling contact between the ball receiving recess and the flat surface is performed. The hot water supply pump for an electric pot according to claim 1, wherein balls to be heated are arranged in each ball receiving recess.