JPH0583388U - Magnet pump - Google Patents

Abstract

(57) [Summary] [Purpose] The rotor and the impeller are mounted in a small size, high withstand pressure, and highly reliable, and the impeller can be easily replaced. [Structure] Cylindrical rotor 23 in which permanent magnet 9 is embedded
And a stator 28 provided on the outer periphery thereof constitute a DC motor, and an impeller 24 is fixedly coupled to one end of a rotor 23 by screwing a screw 30 into the casing 21. And its cylindrical portion 21a. During operation of the pump, the rotor 23 is rotated and is pumped by the impeller 24.
An iron core 27 is attached to the outer side of 1a and has a pressure resistance action.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnet pump, which is a leak-free pump in which a rotor having a permanent magnet embedded therein is rotated by the action of a magnetic field from the outside, and an impeller fixed to one end of the rotor is rotated to perform a pumping action. The present invention relates to a magnet pump suitable for easily responding to a liquid having a large specific gravity or a liquid having a high viscosity by changing the impeller diameter.

[0002]

[Prior Art]

 As an example of a conventional magnet pump, a magnet pump using a radial gap type magnet coupling is shown in FIG. In the figure, reference numeral 1 is a casing, and the casing 1 is composed of a suction casing 4 having a suction port 2 and a discharge port 3 and a casing cover (back casing) 5. Inside the casing 1, an impeller is provided. A pump chamber 7 that rotatably accommodates 6 is formed. The impeller 6 is composed of a blade 8, a permanent magnet 9 and a bearing 12 integrally fixed to each other, and both ends of a main shaft 10 are fixed by a bearing 11 fixed to a suction casing 4 and a bearing 11 fixed to a casing cover 5. It is supported. The permanent magnet 13 for rotating the impeller 6 is fixed in a ring shape along the inner circumference of the magnet yoke 14 fastened to the drive shaft 15 of the motor 14, and the impeller 6 is rotated by the bias of the motor 14 to transfer the impeller 6. The fluid to be introduced flows in through the suction port 2, is pressurized by the blade 8, and flows out through the discharge port 3. In this conventional example, the liquid contacting portion of the pump, that is, the casing 1, the impeller 6, and the bearing 11 are made of resin or ceramic in order to impart corrosion resistance.

[0003]

[Problems to be solved by the device]

 In the conventional magnet pump described above, a part of the casing cover 5 is arranged with a gap provided between the drive permanent magnet 13 attached to the magnet yoke 14 and the permanent magnet 9 embedded in the rotor. Since it is installed, it is not possible to increase the wall thickness at the part A in order to reduce the decrease of the attraction force / repulsion force between the magnets. Therefore, when the pump pressure is high, the outer circumference of the part A is However, due to the rotating magnetic field of the drive permanent magnet 13 and the permanent magnet 9, an eddy current is generated in the metal plate, resulting in a loss.

On the other hand, the impeller of this type of magnet pump is integrated with the rotor shown in FIGS. 4A, 4B, and 4C and the rotor shown in FIG. There are two types of monolithic type, but each has the following problems (defects).

That is, in the separation type (FIG. 4), splines 18 are provided at the center fitting portions of the rotor 16 and the impeller 17, respectively, and the rotor 16 is engaged by engaging both splines 18. The impeller 17 and the impeller 17 are integrally assembled. However, when the pump is frequently started and stopped, or when operation with load fluctuation such as operation in a state where cavitation occurs, the spline 18 is engaged. The joint may be damaged as shown at 18a in FIG. 4 (d).

Further, in the integrated type (FIG. 5), the rotor 16 and the impeller 17 are integrated, so that a rotor magnet with a rotor magnet must be prepared for each impeller diameter. Is an expensive task.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a magnet pump that is small in size, has high withstand pressure, and can be easily attached to the impeller to replace the impeller. ..

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention forms a DC motor with a cylindrical rotor in which a permanent magnet is embedded and a stator provided on the outer periphery of the rotor, and one end of the rotor in the rotation axis direction is formed. In a magnet pump in which an impeller is fixed and the rotor and the impeller are housed in a casing, the rotor and the impeller are screwed and fixed.

[0009]

[Action]

 Since the present invention is configured as described above, when the pump is in operation, the rotor embedded with the permanent magnet rotates and is fixed to one end of the rotor by the action of the rotating magnetic field by the stator provided on the outer periphery of the rotor. The driven impeller rotates, sucks the liquid from the suction port of the casing, boosts the pressure, and discharges it from the discharge port.However, since the stator is placed around the rotor, the discharge from the impeller is performed. Even if a part of the pressurized liquid that has been pressurized enters the rotor chamber, the casing cylindrical portion (21a in FIG. 1) surrounding the part retains pressure resistance.

Further, since the rotation direction of the impeller is one direction, and the impeller and the rotor are screwed and fixedly coupled with each other by a screw in a direction that tightens when the rotor rotates, Even when the pump is operating with load fluctuations, there is no risk of damage to the fixed joints, and the impeller can be replaced easily and at low cost.

[0011]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing an embodiment of the present invention, in which the same reference numerals as those shown in FIG. 3 denote the same or similar parts. In the figure, a casing 21 has a discharge port 3, a suction casing 22 having a suction port 2 is attached to one side of a suction side, and a permanent magnet 9 and a rotor 23 embedded therein are internally provided on the other side. Has a cylindrical portion 21a extending in the axial direction. A pump chamber 25 that rotatably accommodates the impeller 24 is formed in the casing 21, and the pump chamber 25 communicates with the inside of the casing cylindrical portion 21a that accommodates the rotor 23.

A stator 28 composed of an iron core 27 around which a coil 26 is wound is arranged on the outer periphery of the rotor 23 with a gap c, and the outside of the iron core 27 is sealed with a motor cover 29. Further, the inner side thereof is hermetically sealed by the casing cylindrical portion 21a and protected from contact with liquid.

Further, as shown in FIG. 2, the rotor 23 and the impeller 24 are adapted to be fixedly coupled by screwing with a screw 30 in a tightening direction when the rotor rotates. In the figure, 10 is a main shaft, 31 is a rotating side bearing mounted on the rotor 23, and 32 is a stationary side bearing.

With the above configuration, the stator 28 and the permanent magnet 9 of the rotor 23 constitute a DC motor, a magnetic field is generated inside the iron core 27 in the rotation direction, and the rotor 23 in which the permanent magnet 9 is embedded is formed. Rotates in a predetermined direction, and the blade wheel 24 fixed to one end of the rotor 23 rotates to suck the liquid from the suction port 2 of the suction casing 22, pressurize it, and discharge it from the discharge port 3 of the casing 21. Pumping is performed.

At this time, a part of the pressurized liquid pumped out from the impeller 24 flows from the pump chamber 25 as shown by the arrow a, and fills the inside of the casing cylindrical portion 21 a housing the rotor 23. However, since the iron core 27 of the stator 28 is disposed outside the cylindrical portion 21a, the cylindrical portion 21a is prevented from expanding radially due to the internal pressure of the pump chamber 25, and the pump casing 21 The pressure resistance is maintained.

On the other hand, the impeller 24 rotates in one direction, and the impeller 24 and the rotor 23 are screwed and fixedly coupled by the screw 30 in a direction in which the rotor is tightened when the rotor is rotated. Even when the pump is frequently started and stopped, or when the pump is operating with load fluctuations such as cavitation, there is no risk of damage to the fixed joints, and the blades are easy and inexpensive. Only the car 24 can be replaced.

[0017]

[Effect of the device]

 As described above, according to the present invention, a DC motor is composed of a cylindrical rotor in which a permanent magnet is embedded and a stator provided on the outer circumference of the rotor, and one end of the rotor in the rotation axis direction is formed. In a magnet pump in which an impeller is fixed and the rotor and the impeller are housed in a casing, the rotor and the impeller are screwed together and fixed, so that the casing is small and the casing has a high withstand pressure during operation, and The highly reliable screw-in installation makes it easy to replace the impeller.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a magnet pump according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a rotor and an impeller of the present invention are separated, (a) is a rotor, and (b) is an impeller.

FIG. 3 is a cross-sectional side view of essential parts of a magnet pump showing a conventional example.

FIG. 4 shows a conventional example of a separated impeller type, (a) and (b) are sectional views of the separated rotor and impeller, (c) is a front view, and (d) is an explanatory drawing. ..

FIG. 5 is a cross-sectional view showing a conventional example of an impeller integrated type.

[Explanation of symbols]

 21 Casing 21a Casing Cylindrical Part 22 Suction Casing 23 Rotor 24 Impeller 25 Pump Chamber 26 Coil 27 Iron Core 28 Stator 29 Motor Cover 30 Screw

Claims (1)

[Scope of utility model registration request] 1. A cylindrical rotor having a permanent magnet embedded therein,
A DC pump is constituted by a stator provided on the outer circumference of the rotor, an impeller is fixed to one end of the rotor in the rotation axis direction, and the rotor and the impeller are housed in a casing. A magnet pump with an impeller fixed by screwing.