JPH06101680A - Pipe shaft type motor fluid transporter - Google Patents

Abstract

PURPOSE: To deliver fluid efficiently with a simple structure. CONSTITUTION: A central shaft of a rotor 11 inside a stator 10 is a hollow tubular shaft. Pump units 20 A are mounted at both ends of the hollow tubular shaft in the same direction. An impeller 25a of an impeller body 25 built in the outer casing is fitted in a front outer casing 24a and a support blade 25b is fitted in a rear outer casing 24b respectively. When electricity is supplied to the stator 10, the fluid in an intake pipe 31a is sucked in by the left pump unit 20A, flows through the hollow tubular shaft, and discharged from the right pump unit 20A to a discharge pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube shaft type electric motor fluid transportation device for transporting fluids such as gas, liquid, powder and granular fluid, mixed fluid and the like. By changing the conventional transportation method by connecting the electric motor and the transportation device and attaching the pump unit to the tube shaft type electric motor, the fluid is directly transported through the hollow tube shaft.
Therefore, it is a mechanism that has the advantages of drastically improving transport efficiency, reducing noise, reducing failure rate, increasing heat dissipation effect, reducing installation space, energy saving, etc., and is a valuable mechanism as an industrial machine. .

According to the present invention, as compared with a conventional electric motor-based transportation device that employs an indirect system by combining with a complicated mechanism, its rotary shaft is a hollow pipe shaft, and a pump unit is mounted on the hollow pipe shaft. By doing so, it can be transported, has chemical resistance, and is a mechanism with excellent economical efficiency and productivity.

[0003]

2. Description of the Related Art In a conventional electric motor, a stator iron core (a magnetic circuit by inserting a primary coil) is attached to a stator frame (frame), and a rotor shaft (carbon steel rod) is rotated therein. This is a structure in which a child iron core (which becomes a timing circuit by inserting a secondary coil) is arranged. The torque generated in the secondary coil is exerted as a rotary motion through the shaft to the outside, and by connecting with another mechanism, the purpose of the rotary motion type work is achieved.

For example, in the axial flow pump shown in FIG. 6, a propeller B is arranged inside a blow-in curved pipe A, and a shaft C of the propeller B is connected to an electric motor M through a sealing device D for packing and a coupling E. I am letting you.

A friction pump (cascade pump) shown in FIG.
Is connected to the shaft F by an impeller G and rotated by an electric motor through a packing and sealing device, whereby water enters from the inlet H and is accelerated, and is blocked by the bulkhead of I to increase the pressure, It is discharged from J and is used for the purpose of small volume and high head.

[0006]

The above-described fluid transportation device with an electric motor has the following problems.

(1) In order to perform transportation, it is necessary to connect the electric motor, the transmission device, and the transportation means. Therefore, the structure is complicated, many steps are required for assembly, and the failure rate is high because the parts are worn out, so that maintenance and repair are troublesome. Further, since there is a loss between the mechanisms, the efficiency is reduced. Vibration and noise are involved during operation. In addition, the electric motor must be fastened to the base,
Installation is difficult.

(2) Since the fluid is conveyed through a considerably curved passage, it greatly affects the efficiency of the electric motor and reduces the effective value. Also, the noise becomes loud.

(3) Dust, water, oil or the like may reach the electric motor through the transmission device, causing a failure of the electric motor. In order to avoid this, it is necessary to devise a considerable device for the motor protection device.

(4) Since the heat dissipated by the electric motor is only convection of the space air in the outer shell, in order to prevent burnout due to poor heat dissipation, the outer shell of the dust collector with the built-in electric motor must be made large, and must be transported or stored. It's inconvenient.

(5) 3 of electric motor, transmission device and transportation means
Since they are connected to each other and transported through a bent path, the space and weight that they occupy become very large, and the direction of transportation is limited, so that the connection is difficult.

[0012]

Means for Solving the Problems The means of the present invention for solving the above-mentioned problems is such that the central axis of the rotor is a hollow tube axis,
A tube shaft type electric motor fluid transport device for transporting fluid such as gas, liquid, powder and granules, mixed fluid, etc. through the inside of the hollow tubular shaft. The outer shaft of the pump unit that performs discharge is fixed to both ends of the hollow tube shaft so that the fluid transfer direction of each pump unit matches when the hollow tube shaft rotates, and the tube shaft type electric motor fluid transfer is performed. Configured the device.

[0013]

When the hollow tube shaft, which is the central shaft of the rotor, is rotated, the outer shell of the pump unit fixed at both ends also rotates. The pump unit has a built-in vane, which inhales and discharges the fluid by rotating the outer shell, and each pump unit is fixed in the direction in which the fluid transport directions match. The fluid transported by the transportation device is sucked from one pump unit, passes through the inside of the hollow tube shaft, and is discharged from the other pump unit.

[0014]

EXAMPLES In order to further understand the contents and characteristics of the present invention, examples will be described with reference to the drawings.

FIG. 1 shows an embodiment of a tube shaft type electric motor fluid transport device according to the present invention. The tube shaft type electric motor of this embodiment is
A rotor (rotor core) 11 is arranged inside a stator (stator core) 10, and the central axis of the rotor 10 is a hollow tube shaft. The stator 10 is attached to the electric motor outer frame 12.

A pump unit 20 is provided at both ends of the hollow tube shaft.
A is fixed. In another embodiment shown in FIG. 2, pump units 20B are fixed to both ends of the hollow tube shaft.
Each pump unit 20A, 2 in each embodiment
OBs are fixed in the same direction so that the fluid transport directions are the same. The configuration of the pump units 20A and 20B is shown in FIG. 3, and the shape of each blade is shown in FIG.

The hollow tube shaft and the pump units A and B are rotatably supported by both hermetically sealed bearings 22 which are axially positioned by interposing a spacer bush 21a between them and the rotor 11. , The inner sealed bearings 22 and the spacer plate 23 fix the motor outer frame 12. Spacer plate 2
3 is provided with an air hole 23a for cooling.

The outer shell of each pump unit 20A, 20B is divided into a front outer shell 24a and a rear outer shell 24b.
Can be assembled together. The front outer shell 24a and the rear outer shell 24b each have a bowl shape, and the mouth portions of the bowl are assembled together. The bottom of the bowl is threaded.

The tube shaft type electric motor fluid transport apparatus of the embodiment of FIG. 1 is for medium pressure and low capacity, the blades of the pump unit 20A are impeller type, and the impeller fitting groove 24c is formed on the inner surface of the front outer shell 24a. And a support blade fitting groove 24d is provided on the inner surface of the rear outer shell 24b. Impeller body 2
Reference numeral 5 is a shape corresponding to the shape of the outer shell, and is a shape in which the bottoms of two cone shapes are matched. A plurality of impellers 25a are attached to the front part of the impeller body 25, and three support blades 25b are attached to the rear part.

When assembling the front shell 24a and the rear shell 24b so as to house the impeller body 25, the impeller 25a is fitted in the impeller fitting groove 24c, and the supporting blade 25b is fitted in the supporting blade fitting groove 24d. The outer shell and the impeller body 25 are arranged and assembled so as to be integrated.

The pipe shaft type electric motor fluid transport apparatus of the embodiment shown in FIG. 2 has a low pressure and medium capacity, the pump unit 20B has propeller type blades, and the propeller fixed outer ring 26c of the propeller body 26 is ring-shaped. The outer peripheral surface is threaded. The propeller 26 is attached to the inner peripheral surface of the propeller fixed outer ring 26c.
a is attached. A runner cone 26b is located at the center of the propeller 26a.

Propeller fixed outer ring 26 of propeller body 26
The threading on the outer peripheral surface of c corresponds to the threading provided on the joint between the front outer shell 24a and the rear outer shell 24b, and the propeller fixed outer ring 2
By screwing the front shell 24a and the palate 24b to 6c, the front shell 24a and the palate 24b are integrally assembled, and at the same time, the propeller body 26 is also integrated with the shell.

Each of the pump units 20A and 20B has one end fixed to the hollow pipe shaft by screws provided at the suction and discharge ports at both ends, and one end of the short pipe shaft 27 fixed to the other end. There is. At this time, the sets of the pump units 20A and 20B are fixed in the same direction. That is, the left pump units 20A, 20
In B, the front shell 24a is fixed to the short tube shaft 27 and the rear shell 24b is fixed to the hollow tube shaft, and the pump unit 2 on the right side is
In 0A and 20B, the front shell 24a is the hollow tube shaft, and the rear shell 2 is
4b are fixed to the short tube shafts 27, respectively.

The short tube shaft 27 has a spacer bush 21b,
Both hermetically sealed bearings 22 are fitted and rotatably supported with respect to the hub 28. Both ends cover 2 for hub 28
9. A pump housing 30 is attached. The hub 28 connects the pump units 20A and 20B to either the suction pipe 31a or the discharge pipe 31b.
The both-end covers 29 are provided with air holes 29a for cooling.

According to such a tube shaft type electric motor fluid transportation device, when the hollow tube shaft is rotated by energizing the stator 10, the pump units 20A and 20B also rotate integrally, and the fluid in the suction pipe 31a is sucked. Side (left side in FIGS. 1 and 2) is sucked into the pump units 20A, 20B, increases the flow velocity, passes through the inside of the outer shell to reach the inside of the hollow tube shaft, and the pressure rises to the inside of the hollow tube shaft. Pumped. Further, the fluid inside the hollow tube shaft is pump unit A on the discharge side (right side in FIGS. 1 and 2),
After reaching B, the flow velocity and pressure are further obtained, and the discharge pipe 3
It is discharged from 1b.

It is also possible to connect and use a plurality of such tube shaft type electric motor fluid transportation devices. As shown in FIG. 6, when a plurality of fluids are connected in series, the pressure for transporting the fluid can be increased.
Transport capacity can be increased.

According to the above embodiment, the load condition of the electric motor is balanced, so that various losses during operation are small and high efficiency can be obtained. Also, since the hollow tube shaft of the electric motor directly rotates the transportation device, the structure is simple and there are few failures,
It is possible to obtain a compact transportation device that does not require a base, is easy to install, and has a small volume and small weight. At the same time, dust, water and oil will not adhere to and damage the electric motor through the transmission mechanism. Since the transportation route is straight, noise can be reduced.

Further, since the fluid to be transported is transported through the inside of the hollow tube shaft, a cooling heat dissipating action can be expected from the shaft center portion. Further, since one end is made to act as suction and the other end is made to act as discharge, the efficiency is further improved. Furthermore, since the force is directly formed, the efficiency loss of the electric motor is small and the efficiency of the suction force is high.

[0029]

INDUSTRIAL APPLICABILITY The tube shaft type electric motor fluid transportation device according to the present invention can achieve the purpose of sucking, discharging and transporting fluid such as gas, liquid, powder and granular material, mixed fluid and the like. Since the load condition is balanced, various losses during operation can be reduced and high efficiency can be obtained, while facility simplification, efficiency improvement, installation volume reduction, machine weight reduction, noise reduction, failure rate Can be reduced and energy can be saved.
It can be said that this is an excellent mechanism that is highly practical.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main body of an embodiment of a tube shaft type electric motor fluid transportation device according to the present invention.

FIG. 2 is a cross-sectional view showing a main body of another embodiment of the tube shaft type electric motor fluid transportation device according to the present invention.

FIG. 3 is an exploded view of a pump unit used in the embodiment of FIGS. 1 and 2 and an exploded view of a pump unit peripheral portion of the embodiment of FIG.

FIG. 4 is a diagram showing structures of a propeller and an impeller used in the embodiments of FIGS. 1 and 2.

FIG. 5 is a schematic view showing an example of a form of series and parallel connection of the embodiment of FIGS.

FIG. 6 is a diagram showing an example of a conventional axial flow pump.

FIG. 7 is a diagram showing an example of a conventional friction pump.

[Explanation of symbols]

 Reference Signs List 10 stator 11 rotor 20A pump unit 24a front outer shell 24b rear outer shell 25 impeller body 25a impeller 25b supporting blade 31a suction pipe 31b discharge pipe

Claims (1)

[Claims] 1. A pipe shaft type electric motor fluid transporting device for transporting fluid such as gas, liquid, granular material, mixed fluid, etc. through the inside of the hollow pipe shaft as a central shaft of a rotor. , The blade is built-in, and by swirling it
Pipe shafts characterized in that the outer shell of the pump unit for discharging is fixed to both ends of the hollow pipe shaft so that the fluid transport directions of the pump units coincide with each other when the hollow pipe shaft rotates. Electric motor fluid transportation device.