JPH09242684A - Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise. SOLUTION: A shaft 42 is formed in the shroud 40 of an impeller 34, and supported by an axial bearing 44 and a radial bearing 46 formed in the hole 12a of a pump housing 12. The shaft 42 is supported by the axial bearing 44 so that force by which the impeller 34 is floated during the operation of a pump is adsorbed. Therefore, as the conventional case, the shroud 40 arranged in the upper part of the impeller 34 may not be worn by being brought in contact with the pump housing 12 by the float of the impeller 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump, and more particularly to a drive side magnet rotated by a motor,
The present invention relates to a pump that attracts a driven-side magnet provided on an impeller side to drive an impeller to rotate.

[0002]

2. Description of the Related Art A conventional spherical pump 1 of this type shown in FIG.
Is operated, the rotor 3 having the impeller 2 provided on the upper portion is rotated in the pump housing 4. Then, the fluid sucked from the suction port 5 formed in the upper portion of the pump housing 4 is discharged through a rotating impeller 2 from a discharge port (not shown) formed on the side surface of the pump housing 4.

[0003]

In the spherical pump 1 thus operated, the lower side of the impeller 2 is higher in pressure than the upper side of the impeller 2 in the pump chamber 6 in which the impeller 2 is arranged. Becomes Therefore, the rotating impeller 2 may float and the upper side of the impeller 2 may come into contact with the pump housing 4 in the pump chamber 6 and become worn, which causes a problem that normal operation cannot be performed.

In order to solve such a problem, the impeller 2 is provided with a balance hole which is a hole penetrating in the axial direction, and the pressure on the lower side of the impeller 2 is passed through the inside of the impeller 2 to the upper side by this balance hole. The lower surface of the impeller 2 is removed or a back blade is provided on the lower surface of the impeller 2 to release the pressure on the lower side of the impeller 2 to reduce the floating of the impeller 2. Further, the partition plate 7 that divides the inside of the pump chamber 6 and the rotor 3 that faces below the partition plate 7 are provided with magnets 8 and 9 that repel each other to prevent the impeller 2 from floating.

However, there is a limit to reducing the levitation of the impeller 2 by these methods, and when an excessive force for levitating the impeller 2 is applied, the impeller 2 is re-considered in consideration of levitation. It is necessary to design, but the design man-hour increases. Therefore, a main object of the present invention is to provide a pump capable of eliminating abnormal operation due to floating of an impeller.

[0006]

SUMMARY OF THE INVENTION The present invention is a pump in which an impeller having an impeller and a shroud is provided in a pump housing, and the impeller is rotationally driven by magnetic force, and a shaft formed in the shroud, and A pump having a bearing formed in a pump housing to receive a shaft.

[0007]

When the impeller is rotationally driven by magnetic force, a force is applied to the impeller due to the pressure. Then, the shaft formed in the shroud of the impeller is rotatably supported by the bearing formed in the pump housing, and this force is absorbed. Therefore, it is possible to prevent the shroud of the impeller from coming into contact with the pump housing due to the floating of the impeller and causing the shroud to be worn.

[0008]

According to the present invention, it is possible to prevent abrasion of the shroud due to floating of the impeller, and it is possible to operate even in a floating state. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The pump 10 of this embodiment shown in FIG. 1 includes a pump housing 12. A pump suction port 14 is formed in the center of the upper surface of the pump housing 12, and a pump discharge port (not shown) is formed on the upper side surface of the pump housing 12. A partition wall 20 that divides the internal space of the pump housing 12 into a motor chamber 16 and a pump chamber 18 is provided inside the pump housing 12. The partition wall 20 is formed so as to project toward the motor chamber 16 side.

A motor 22 is housed inside the motor chamber 16, and a magnet support member 26 is attached to a rotary shaft 24 of the motor 22. The magnet support member 26 includes a cylindrical drive-side magnet 2 that follows the shape of the partition wall 20.
8 is fixed. On the other hand, the pump chamber 18 accommodates a driven magnet 30, a rotor support 32, a rotor 36 including an impeller 34, and the like. The impeller 34 includes a disc-shaped impeller 38 and a shroud 40, and a plurality of blades having a predetermined curvature and a predetermined height are formed on the main surface of the impeller 38 arranged below the impeller 34. To be done. Further, the upper portion of the rotor support portion 32 is fitted into the hole formed in the center of the impeller 38. On the upper side of the impeller 38, a hole 38a having a diameter substantially equal to the diameter of the pump suction port 14 is formed in the center, and a shroud 40 covering the upper surfaces of a plurality of blades of the impeller 38 is attached. The center of the shroud 40 is formed in a cylindrical shaft shape so as to project upward, and a cylindrical shaft 42 made of ceramic having excellent wear resistance is fitted from the outside of the projecting end. On the other hand, the lower side of the rotor support portion 32 is formed in a cylindrical shape along the partition wall 20, and a cylindrical driven side magnet 30 attracting the driving side magnet 28 is fixed thereto.

Inside the pump chamber 18 of the pump housing 12 at the pump suction port 14, a hole 12 having a predetermined depth, which is slightly larger than the outer diameter of the shaft 42 fitted to the shroud 40.
a is formed, and an axial bearing 44 and a radial bearing 46 are arranged in this order in the hole 12a. The inner diameter of the axial bearing 44 is set to be substantially equal to the inner diameter of the shaft 42, and the outer diameter is set to be substantially equal to the diameter of the hole 12a.
Reference numeral 4 is formed in a ring shape made of ceramic and having a predetermined thickness. On the other hand, the inner diameter of the radial bearing 46 is set to be substantially equal to the outer diameter of the shaft 42, and the outer diameter is set to be substantially equal to the diameter of the hole 12a.
The radial bearing 46 is formed in a cylindrical shape made of carbon.

When the rotor 36 is arranged in the pump chamber 18, the upper surface of the shaft 42 arranged at the top of the rotor 36 abuts the lower surface of the axial bearing 44, and the outer circumference of the shaft 42 becomes the inner circumference of the radial bearing 44. Shaft 4 so that there is a constant gap
2 is placed. At this time, the driven-side magnet 30 arranged below the rotor 36 is arranged slightly below the drive-side magnet 28. Since the drive-side magnet 28 and the driven-side magnet 30 attract each other, the rotor 36
In the pump chamber 18, the upper surface of the upper shaft 42 is brought into contact with the lower surface of the axial bearing 44 and is held in a floating state.

In operation, when the start switch (not shown) is turned on to drive the motor 22, the magnet support member 26 and the drive magnet 28 are rotated as the rotary shaft 24 rotates. Then, the drive magnet 28
The driven magnet 30 attracted by is rotated,
Along with that, the entire rotor 36 including the impeller 34 and the like is rotated. When the entire rotor 36 is rotated, the impeller 34 acts to suck the fluid into the pump chamber 18 from the pump suction port 14 and discharge the fluid from a discharge port (not shown).

At this time, the lower surface of the impeller 38 has a higher pressure than the upper surface of the shroud 40 of the impeller 34. Therefore, a floating force is applied to the impeller 34. However, this force is absorbed by the upper surface of the shaft 42 fitted to the upper part of the shroud 40 being supported by the axial bearing 44. Also,
Although the axial bearing 44 and the radial bearing 46, which have wear resistance, and the shaft 42 wear over time, the shroud 40 of the impeller 34 contacts the pump housing 12 due to the floating of the impeller 34 as in the conventional case. And will not wear out. Further, the radial bearing 46 prevents the rotor 36 from swinging in the radial direction.

According to this embodiment, the abrasion of the shroud 40 due to the floating of the impeller 34 can be prevented, so that the noise can be reduced. Therefore, it is not necessary to redesign the complicated impeller 34 in consideration of the floating of the impeller 34 as in the conventional case, and it is possible to easily deal with the problem caused by the floating of the impeller 34.
Further, since the axial bearing 44 and the radial bearing 46 are incorporated on the pump housing 12 side, when the life of each bearing is reached, it can be easily replaced by disassembling the pump housing 12. Further, the pump housing 12
Since the impeller 34 and the impeller 34 are integrated via a bearing, assembly and the like are facilitated. Further, since the radial bearing 46 is used to support the rotor 36, the rotor 36 can be installed in a large radial load such as horizontal installation.

Further, in the above-described embodiment, the case where the driven side magnet 30 is arranged slightly below the driving side magnet 28 so as to absorb each other and the shaft 42 is supported by the axial bearing 44 and the radial bearing 46 has been shown. . A pump 50 having the same function as this is, for example, a pump 50 according to another embodiment shown in FIG. The pump 50 has the drive-side magnet 28 and the driven-side magnet 30 arranged at substantially the same height, and magnets that repel each other so as to float the rotor 36 at other positions. That is, magnets 54 and 56 that repel each other are provided on the lower surface of the impeller 38 of the impeller 34 and the partition plate 52 that faces the lower surface of the impeller 38 and divides the interior of the pump chamber 18 into two, and the rotor support portion 3
Magnets 58 and 60 that repel each other are also provided on the lower surface of 2 and the upper surface of the partition wall 20 facing this.

Although the shaft 42 and the axial bearing 44 are made of ceramic and the radial bearing 46 is made of carbon in the above embodiment, the shaft 42, the axial bearing 44 and the radial bearing 46 are made of carbon. It may be ceramic or a combination of ceramic and ceramic. Further, according to the above-described embodiment, the case where the drive side magnet 28 is rotated by driving the motor 22 and the driven side magnet 30 is attracted to rotate the impeller 34 and the like has been described. Alternatively, a coil may be arranged on the driven side to rotate the driven side by electromagnetic induction.

[Brief description of drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is an illustrative view showing another embodiment.

FIG. 3 is an illustrative view showing a conventional technique;

[Explanation of symbols]

 10, 50 ... Pump 12 ... Pump housing 14 ... Pump suction port 16 ... Motor chamber 18 ... Pump chamber 20 ... Partition wall 22 ... Motor 24 ... Rotating shaft 26 ... Magnet support member 28 ... Drive side magnet 30 ... Driven side magnet 32 ... Rotor Support part 34 ... Impeller 36 ... Rotor 38 ... Impeller 40 ... Shroud 42 ... Shaft 44 ... Axial bearing 46 ... Radial bearing 52 ... Partition plate 54, 56, 58, 60 ... Magnet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoaki Inouchi 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Vinyl Pipe Factory Co., Ltd. Incorporated (72) Inventor Masaru Tomisaka 1-247 Shikitsuhigashi Naniwa-ku, Osaka City Kubota Lang Co., Ltd.

Claims (1)

[Claims] 1. A pump for providing an impeller having an impeller and a shroud in a pump housing, and rotationally driving the impeller by magnetic force, the shaft being formed in the shroud, and the pump housing. And a bearing for receiving the shaft.