JP3357639B2 - Turbo type pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a turbo pump, and more particularly to a turbo pump applied to biotechnology, space station equipment, semiconductor manufacturing technology, medical equipment, and the like.

[0002]

2. Description of the Related Art A turbo type pump is an impeller (impeller).
Is used to increase the pressure by giving a rotational motion to a fluid, and is widely used in the industry.

FIG. 6 is a diagram showing a conventional turbo pump used for biotechnology, semiconductor manufacturing technology, medical equipment, and the like.

Referring to FIG. 6, a pump 20 includes an impeller 21 for imparting a rotational motion to a fluid. The impeller 21 is supported by a rotation shaft 22. The rotating shaft 22 is supported by a rolling bearing 23 and is driven by a motor 24. When the rotation shaft 22 is rotated by the motor 24, the impeller 21 supported by the rotation shaft 22 rotates. Impeller 2
With the rotation of 1, the fluid is sucked from the suction pipe 26 and discharged through the spiral chamber 27.

[0005] Pumps used in biotechnology, semiconductor manufacturing technology, medical equipment and the like are required to be extremely clean. Therefore, in the pump 20 shown in FIG. 6, a seal 25 is provided between the bearing 23 on the impeller 21 side and the impeller 21 in order to isolate the fluid from the rolling bearing 23 and the motor 24 that generate pollutants that contaminate the fluid. Provided.

[0006]

However, since the seal 25 is in contact with the rotating shaft 22, there is a problem that the fluid is contaminated by heat generation and generation of contaminants at the contact portion.

Further, in order to reduce contamination by rust or rust from the bearing portion or the motor portion, it is conceivable to mold an electromagnet such as a motor or to plate an iron portion. However, even with such an improvement, the conventional pump has a place where the fluid stagnates in the spindle, and such stagnation causes solidification of the fluid and precipitation of impurities. This is a serious problem.

[0008] Therefore, a main object of the present invention is to provide a turbo type pump capable of sending a fluid in a clean state without stagnation.

[0009]

SUMMARY OF THE INVENTION The present invention provides a controlled magnetic
Bearing and non-contact supported at a predetermined position in the casing
This is a turbo pump having an impeller .

[0010] The control type magnetic bearing, and the magnetic member provided on one surface of the impeller, an electromagnet attached to the casing so as to face the magnetic member of the impeller, this
Make sure that the distance between these magnetic members and the electromagnet is detected.
And a position sensor attached to the thing .

Further , the impeller is provided via a casing.
To apply rotational driving force to the impeller from the other side of the impeller
Magnetic force and a controlled magnetic bearing
Balanced by magnetic force acting on one surface
It is supported in a state.

[0012] (Function) In the present invention, the magnetic portion provided on one surface of the impeller
Controlled magnetism by the material and the electromagnet attached to the casing
Construct an air bearing. The impeller is inserted through the casing
It rotates by the magnetic force acting on the other surface of the impeller.
By these magnetic effects acting on both surfaces of the impeller, the impeller is supported from outside the casing in a non-contact manner.

[0013]

FIG. 1 is a sectional view showing the structure of a turbo pump according to an embodiment of the present invention. In FIG. 1, an impeller 3 is provided in a casing 2 of a pump 1. The casing 2 is made of a non-magnetic member. The impeller 3 is made by combining a non-magnetic member 5 having a permanent magnet 4 constituting a rotation driving means and a soft iron member 6 corresponding to a rotor of a control type magnetic bearing by rivets or the like. Also,
The soft iron member 6 is subjected to a surface treatment so that rust or the like is not generated. The permanent magnet 4 is divided in the circumferential direction of the impeller 3 and is magnetized so that the directions of the magnetic fields of the adjacent magnets are opposite to each other. The casing 2 is opposed to the side of the impeller 3 having the permanent magnet 4.
A stator 7 is provided outside. As shown in FIG. 2, the stator 7 has stator windings 8 arranged on a circumference. The number of stator windings 8 is 1.5 times the number of permanent magnets 4 on the impeller 3 side. A sensor (not shown) for detecting the rotational position of the impeller 3 is provided on the stator 7 side, and a contactless control commutator (see FIG. 1) connected to each stator winding 8 according to the rotational position. By turning on / off (not shown), the magnetic field is rotated, and the impeller 3 provided with the permanent magnet 4 is rotated.

On the other hand, the casing 2 is provided with a permanent magnet 4 so as to face the side of the impeller 3 having the soft iron member 6.
And magnet stator 1 acting to hold impeller 3 at the center of casing 2 in balance with the magnetic action of
0 is attached. In this embodiment, four electromagnets 10 are provided as shown by reference numerals m1 to m4 in FIG. 3, but it is necessary to provide at least three electromagnets. As shown in FIG. 4, this balances the force in the coordinate axis z direction (axial direction of the impeller), and the x-axis and y-axis are orthogonal to the z-axis.
This is to reduce the moment about the axis to zero. Electromagnet 10
As shown in FIG. 3, a pair of yokes 11 includes a pair of yokes 11 and a coil 12 wound around one yoke.

Position sensors s1 to s4 are provided between the electromagnets. The position sensors s1 to s4 allow the electromagnet 10
The interval between the gap and the soft iron member 6 is detected, and the detected output is fed back to a control unit (not shown) for controlling the current supplied to the coil 12. Thereby, z, θ _x and θ _y shown in FIG. 4 are controlled, and the impeller 3
Held in the center of the

Even if a radial force acts on the impeller 3 due to gravity or the like, a shear force of a magnetic flux (shown by a broken line in FIG. 1) between the electromagnet 10 and the soft iron member 6 acts. It is held at the center of the casing 2.

When the impeller 3 rotates as shown in FIG. 5 in the magnetically supported state, the fluid is sucked from the suction port 13 and sent to the discharge port 14.

The impeller 3 is fixed to the stator 7 by the casing 2.
The fluid discharged from the pump 1 keeps a clean state because it is isolated from the electromagnet 10 and does not receive contamination.

Further, since there is no place in the pump 2 where the fluid stays, even if the pump is applied to a blood pump, a thrombus or the like does not occur.

[0020]

As described above, according to the present invention, since the impeller is supported from the outside of the casing by magnetic action without contacting the impeller, the fluid is not contaminated and Can be sent without stagnation.

Further, the pump of the present invention does not require any shaft, bearings, and seals of the pump body, and does not have any moving mechanical parts that cause wear, so that maintenance and management is unnecessary.

Further, the life of the pump of the present invention depends only on the corrosion resistance of the material constituting the pump and the life of the electric circuit, so that the pump can be operated semipermanently. This is extremely important for artificial hearts and space equipment.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the structure of a turbo pump according to one embodiment of the present invention.

FIG. 2 is a view showing an arrangement state of windings of the stator shown in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III shown in FIG.

FIG. 4 is a view for explaining a balanced state of the impeller shown in FIG. 1;

FIG. 5 is a view for explaining a pumping operation of the turbo type pump shown in FIG. 1;

FIG. 6 is a sectional view showing a conventional centrifugal pump.

[Explanation of symbols]

1 turbo pump, 2 casing, 3 impeller,
4 permanent magnet, 5 non-magnetic member, 6 magnetic member, 7 stator, 8 stator winding, 10 electromagnet.

Continuation of front page (56) References JP-A-1-219391 (JP, A) JP-A 48-91503 (JP, U) JP-A 2-77318 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) F04D 13/06 F04D 15/00 101 F04D 29/04

Claims (1)

(57) [Claims] 1. A turbo pump comprising a control type magnetic bearing and an impeller supported at a predetermined position in a casing in a non-contact manner, wherein the control type magnetic bearing is provided on one surface of the impeller. A magnetic member, an electromagnet attached to the casing so as to face the magnetic member of the impeller, and a distance between the magnetic member and the electromagnet.
And a position sensor attached to the casing. The turbo pump is supported in a balanced state by a magnetic force acting on one surface of the turbo pump.