JPH03218252A - Immersion-type electromagnetic pump - Google Patents

Abstract

PURPOSE:To obtain a small-size and large capacity pump whose inner coil is efficiently cooled by a method wherein a heat-pipe is provided at the center part in an inner duct and the radiation part of the heat-pipe is provided on the exit side of an annulus flow path to discharge heat generated in the inner coil efficiently. CONSTITUTION:Heat generated in an inner coil 7 is discharged through an inner stator core 8, an inner duct 6 and fluid and, at the same time, reaches the operating liquid in a heat-pipe 12 through the inner stator core 8 and the heat-pipe 12 to vaporize the liquid. The vaporized working liquid reaches a radiation part 12a outside the inner duct and is liquefied by cooling fluid. Thus the heat is discharged. As the heat generated in the inner coil 7 which is a heat generating part can be efficiently transmitted from the inner duct to liquid sodium, so that the temperature rise of the inner coil 7 can be allowed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a submerged electromagnetic pump that is immersed in a conductive fluid and used for transporting the fluid.

(Prior art) A three-phase induction electromagnetic pump has three-phase AC windings distributed in the order of each phase in the direction of flow of the electromagnetic pump, and when three-phase AC is applied to these windings, the direction of fluid flow changes. A traveling magnetic field is generated. When this traveling magnetic field is made to pass through the duct I ~ in which there is a conductive fluid, a voltage is induced in the fluid according to Fleming's right-hand rule, and an induced current flows thereby. This induced current and some components of the traveling magnetic field act to create an electromagnetic force, which acts as a pump by receiving force so that the fluid flows.

This electromagnetic force is the same as the torque in an induction machine or the thrust in a near motor.

Three-phase induction electromagnetic pumps are roughly divided into two types based on their structure: (1) flat linear electromagnetic pumps, and annular linear electromagnetic pumps.
Divided into types.

The present invention relates to an annular linear electromagnetic pump that is operated while being immersed in a fluid, and has a two-stator configuration in which a coil is also arranged in the inner core of the pump.The structure thereof will be described below.

The annular linear electromagnetic pump has an annular flow path, so it is called ALIP (Annular Linear I).
(abbreviation of induction pump). Electromagnetic pumps have become mainstream in recent years because of their high reliability and safety.

Figures 2 and 3 show the basic structure of ALIP.

The structural features are as follows.

(g) The duct has a concentric double pipe structure with an outer duct 4 and an inner duct 6, forming an annulus flow path 5 through which fluid flows.

■ For the outer and inner stators, in order to form a magnetic circuit of an alternating magnetic field, an outer stator core 2 and an inner stator core 8 of a laminated core block in which cores with slots are stacked in the circumferential direction are connected to an outer duct 4. A plurality of them are arranged in the circumferential direction on the outside of the inner duct 6 and inside the inner duct 6. At this time, the laminated surface faces toward the duct 1, and the slots are placed on the duct side, so that the entire core is radial.

A ring-shaped outer coil 3 and an inner coil 7 are arranged within this slot. A large number of coils are arranged in the axial direction and are connected so that the three-phase alternating current creates a traveling magnetic field.

(3) The outer stator core 2 and the outer coil 3 are frame]
The inner stator core 8 and the inner coil 7 are housed in the inner ducts 1 and 6, which have conical ends, and form the outer duct 1-. Form.

The internal duct is fixedly supported on the external duct by supports 9.

(d) The fluid enters the electromagnetic pump from the fluid inlet 10,
Pressure is induced while the fluid flows through the funulus channel 5 and exits from the fluid outlet 11.

(Problems to be Solved by the Invention) In the electromagnetic pump with the immersion structure as described above, liquid sodium is mainly used as the electromagnetic fluid, and the
It will be operated at a high temperature of 0°C. In order to increase the output of an electromagnetic pump, it is necessary to increase the length of the coil to allow a large amount of current to flow through the coil, thereby increasing the temperature of the coil. For this purpose, how to release the heat generated by the inner coil 7 in the inner duct 1 to the -3-Na1 helium fluid is an important issue in order to increase the temperature rise of the coil.

In the internal duct of the conventional structure, the heat generated by the internal coil 7 is transmitted through the internal iron core 8 to the internal duct 6 through the thermal path.
- Heat was transferred to the pump, and the heat dissipation from the inside of the internal duct 1 was poor, making it impossible to increase the capacity and downsize the electromagnetic pump.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a small, large-capacity immersion-type electromagnetic pump that has an inner coil that is well cooled.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a heat pipe at the center of the internal duct,
The heat radiation part of this heat pipe is provided on the exit side of the annulus flow path.

(Function) According to the above configuration, the heat generated in the internal duct heats the working fluid inside the heat pipe, and is cooled by sodium in the fluid in the heat dissipation section, efficiently dissipating the heat generated in the internal duct.
Dissipates heat to the outside.

41 (Example) Hereinafter, an example of the present invention will be described with reference to FIG. 1.

In this embodiment, a heat pipe 12 is provided inside the inner stator core 8 so as to be in close contact with the core 8. This heat pipe 12 is passed through the conical part of the inner duct 6 and outputted to the fluid outlet 11 of the annulus flow path, and the heat dissipation part 1 is equipped with fins.
2a is provided.

Note that the other configurations are the same as the conventional structure, so explanations will be omitted.

Next, the operation of this embodiment will be explained.

The heat generated in the inner coil 7 is transferred from the inner stator core 8 to the inner duct L-6 to the fluid and the heat is released, and also passes through the inner stator core 8 to the heat pipe 12 to the heel pipe 12.
The working fluid inside is vaporized and transferred to the heat dissipation section 12a outside the internal duct.
It is cooled by the fluid and liquefied. This allows heat to escape.

In this way, the heat generated in the inner coil 7, which is the heat generating part, can be efficiently released from the inner duct to the fluid, and the temperature rise of the inner coil 7 can be increased, and the electromagnetic pump can be made larger in capacity and more compact. can be achieved.

〔Effect of the invention〕

As described below, the present invention provides heat pipes inward to the internal duct 1, thereby distributing the heat generated in the inner coil in two directions from the inner stator core to the inner duct and the heat pipe to the fluid. Since the air can be released widely and efficiently, the temperature rise of the inner stator coil can be increased, and the electromagnetic pump can be made larger in capacity and smaller in size.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of an electromagnetic pump according to the present invention, and FIGS. 2 and 3 are longitudinal cross-sectional views and cross-sectional views of a conventional electromagnetic pump. 1...Frame 2...Outer stator core 3...
Outer coil 4... Outer duct 5... Annulus circuit 6. Inner duct 7... Inner coil 8.
Inner stator core 9...Support]:10...Fluid inlet 11...Fluid outlet 112...Heat pipe 12a...Heat radiation section

Claims (1)

[Claims] It has a double cylindrical duct through which conductive fluid flows, and several stator cores of a laminated core block with slots on the inner and outer peripheries of the double cylindrical duct are arranged, and the slots of the stator core are conductive. A large number of annular coils are arranged to flow three-phase alternating current to create a traveling magnetic field in the internal flow path of the duct containing the fluid, and a heat pipe heating section is installed in the center of the internal duct. An immersion type electromagnetic pump characterized in that a heat dissipation part is provided at the outlet of a conductive fluid flow path.