JPH05272492A - Motor integrated type pump - Google Patents

Abstract

PURPOSE:To dispense with shaft seal so as to dissolve friction loss and wear caused by sliding motion between a shaft and the seal and to prevent the leak of liquid by mounting the rotor of an induction motor to the outer periphery of a rotatably supported impeller, and disposing a stator inside a casing, face to face with the rotor. CONSTITUTION:In this pump, the rotor 1 of an induction motor is mounted to the outer periphery of an impeller 5, integrally with the impeller 5, and the impeller 5 integral with the rotor 1 is integrated into a casing 2, together with a bearing 6, a rotary shaft 3, and the like. Inside the casing, a stator 4 is fitted face to face with the rotor 1, and the inside where a fluid passes is completely separated from the outside by the casing 2. When magnetic force is generated by the stator 4, resiliency is generated to the rotor 1, against this magnetic force, so that the rotor 1 is rotated. At the same time, the impeller 5 is also rotated to perform pumping action. Accordingly, there is no need to pass the rotary shaft 3 through to the outside of the casing 2 to drive the impeller 5, so that shaft seal can be dispensed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-integrated pump applied to a liquid fuel booster in a rocket.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory view of a conventional pump. In the figure, a conventional pump operates by directly connecting a rotary shaft 03 to a power source such as an electric motor or a turbine.
A shaft seal is required to prevent fluid from flowing out of the pump to the outside or the electric motor, and packing 04 is attached. Reference numeral 05 is a rotor of an electric motor, 06 is a stator (stator), 07 is a bearing, and 08 is a packing holder for a shaft seal.

[0003]

As described above, the conventional pump needs a shaft seal so that the fluid does not flow out of the pump to the outside or the electric motor, and the sliding between the rotary shaft 03 and the packing 04. Causes power loss and wear. Further, it is difficult to completely prevent the fluid leakage from the inside of the pump by the shaft seal.

[0004]

SUMMARY OF THE INVENTION An electric motor-integrated pump according to the present invention is intended to solve the above problems, and is a rotor of an induction motor mounted on the outer periphery of an impeller rotatably supported in a casing. And a stator of the induction motor arranged inside the casing so as to face the rotor.

[0005]

That is, in the motor-integrated pump according to the present invention, the rotor of the induction motor is mounted on the outer periphery of the impeller rotatably supported in the casing, and the rotor is guided inside the casing so as to face the rotor. A stator of the electric motor is provided, and a rotor inside the casing rotates by a stator inside the casing to directly drive the impeller, thereby performing a pumping action. Therefore, it is not necessary to drive the impeller by penetrating the rotary shaft to the outside of the casing, and the shaft seal can be eliminated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an electric motor integrated pump according to an embodiment of the present invention. In the figure, the electric motor integrated pump according to the present embodiment is used as a booster for liquid fuel in a rocket, and is guided to the outer periphery of the impeller 5 of the present pump as shown in the figure so as not to require a shaft seal. The rotor 1 of the motor is mounted integrally with the impeller 5, and the impeller 5 integrated with the rotor 1 as a rotor together with the bearing 6, the rotating shaft 3 and the like in the casing 2.
Is incorporated. Further, inside the casing 2, a stator (stator) 4 facing the rotor 1 and driving the rotor 1 is attached, and an electric wire 7 of the stator 4 penetrates the casing 2 and is drawn out to the outside. By sealing this penetrating portion, the inside through which the fluid flows is completely separated from the outside by the casing 2. The rotor 1 may be integrally mounted on the outer circumference of an inducer (not shown) instead of the impeller 5. When a magnetic force is generated by the stator 4, a repulsive force is generated in the rotor 1 against this magnetic force, and the rotor 1 rotates on the same principle as an induction motor. The impeller 5 also rotates together with the rotor 1 to perform pumping action.

As described above, in the electric motor integrated pump, the rotor 1 is attached to the outer periphery of the impeller 5 so as to be integrated, so that the impeller 5 is directly driven by the rotor 1 in the casing 2 to rotate. Since the electric motor and the pump are integrated to eliminate the need for a shaft seal and the rotating shaft 3 is shortened, strict concentricity and dimensional tolerance with respect to the rotating shaft 3, the casing 2, the bearing 6, etc. are eliminated, and No special adjustment jig for sealing is required. Further, the rotor 4 faces the rotor 1 inside the casing 2 with a small gap, and is of high torque and high output type like the conventional electric motor. Also, impeller 6
Since the rotor 1 is directly attached and integrated on the outer circumference of the pump, there is no need for a shaft seal or a shaft seal push in the conventional pump, and there are no sliding points, so flammability and danger of hydrazines, hydrogen, etc. Leakage of fluid, fluid used in a vacuum such as a space station, etc. can be eliminated. In addition, the purge required for the shaft seal is not necessary especially in the case of extremely low temperature and flammable fluid. Further, by integrating the impeller 5 and the rotor 1, the rotating shaft 3 can be shortened and vibration due to eccentricity can be suppressed. Further, even when used in vacuum, cooling of the electric motor is unnecessary. In addition, the weight of the pump can be reduced and the size can be reduced, which is about 50 to 70% of the conventional weight. In addition, mechanical loss can be reduced, and life can be greatly extended. In addition, the superconducting coil can be cooled by using it for liquid cryogenic liquid such as liquid hydrogen and liquid nitrogen, which can greatly improve the conduction efficiency. Further, since the inside and outside of the pump are completely separated from each other by the casing 2, the combustible fluid can be prevented from leaking. Further, it can be used as a vacuum space pump in which fluid leakage is never allowed. Therefore, this pump should not only be used as a liquid fuel booster in rockets, but also for transporting cryogenic fluids such as liquid hydrogen, liquid oxygen, liquid nitrogen, and liquid helium, non-magnetic fluids, and flammable fluids. You can

[0008]

The electric motor-integrated pump according to the present invention is constructed as described above, and since the shaft seal can be eliminated, power loss and wear due to sliding between the rotary shaft and the shaft seal do not occur, and Fluid leakage from inside the pump is completely prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric motor integrated pump according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional pump.

[Explanation of symbols]

 1 rotor 2 casing 3 rotating shaft 4 stator 5 impeller 6 bearing 7 electric wire 8 seal

Claims (1)

[Claims] 1. A rotor of an induction motor mounted on an outer periphery of an impeller rotatably supported in a casing, and a stator of the induction motor arranged inside the casing so as to face the rotor. An electric motor integrated pump characterized by comprising: