JPS59105856A - Apparatus for recovering magnetic metal powder in fluid - Google Patents

Abstract

PURPOSE:To obtain the titled apparatus with long life having no mechanically movable and friction parts, in the apparatus, by utilizing a rotary magnetic field being a unique electromagnet as an attracting body in place of a permanent magnet. CONSTITUTION:A magnetic metal powder-containing fluid is passed through a spiral pipeline 4 from an inflow port 6 to reach a flow dividing port 8. During this process, the magnetic metal powder uniformly mixed and distributed into the spiral pipeline 4 at the inflow port 6 is attracted to a rotary magnetic field generated between a coil 1 and an iron core 3 and being a magnetic field moving while matching the relative speed thereof with the fluid as the fluid advances through the pipeline 4. In this case, the concn. of the metal powder in the sides of the coil 1 and the iron core 3 in the spiral pipeline 4 becomes high while the concn. thereof at the central part between the coil 1 and the iron core 3 relatively becomes low. The fluid low in the concn. of the metal powder is exhausted to an effuent port 7 from the flow dividing port 8 while the metal powder is separated at the flow dividing port 8 and automatically transferred into a doughnut shaped recovery box 5 while attracted to the rotary magnetic field.

Description

[Detailed description of the invention] The present invention relates to an apparatus for recovering magnetic metal powder in a fluid.

Conventionally, methods for removing magnetic metal powder from fluids include installing a box with a built-in permanent magnet in the fluid conduit, and collecting the metal powder by flowing fluid into the box, or using a permanent magnet. Instead of moving it in a fluid, the metal powder was adsorbed and collected by scraping it off with a brush attached to a collection device.

However, according to these methods, the collection efficiency of metal powder is fixed depending on the strength of the magnetic field of the permanent magnet, and the collection efficiency can be adjusted by adjusting the magnetic field strength depending on the concentration of metal powder or fluid flow rate. I can't. Furthermore, in order to improve the collection efficiency, it is necessary to increase the surface area of the permanent magnet, which makes it difficult to remove the adsorbed metal powder. Furthermore, methods that have mechanically movable parts to remove adsorbed metal powder have the disadvantage of requiring maintenance due to wear and tear on the equipment.

The present invention utilizes a rotating magnetic field, which is a type of electromagnet, instead of a permanent magnet.The structure and operation of the present invention will be explained in detail below based on illustrated embodiments.

FIGS. 1 and 2 show cross-sectional views of a recovery device to which the present invention is applied. Reference numeral 3 designates an iron core, and a helical source conduit 4, which is a flow path for a fluid mixed with magnetic metal powder, is fitted onto the iron core 3, and a coil for a rotating magnetic field stamp JJD is fitted onto the helical conduit 4. 1 is fitted onto the outside of the coil 1, and the coil 1 is configured to be able to apply a rotating magnetic field to the fluid advancing force of the helical conduit 4. Further, a three-phase power supply with variable frequency and variable voltage is connected to the coil 1,
The strength and rotational speed of the rotating magnetic field are variable.

The spiral conduit also has an inlet 6, an outlet lower, and a branch port 8 at a branch point between the outlet lower and the collection box 5. 5 is a removable collection box for the metal powder, and between it and the diversion port 8,
It is connected via a gasket 2 for attaching and detaching the collection box.

FIG. 3 shows the configuration of a piping system including this device.

9 is a tank for fluid mixed with magnetic metal powder, 10 is a pump, and 11 is a recovery device according to this embodiment.

Next, the operation of this device will be explained. The fluid pumped through the pipe line 12 from the tank 9 in FIG.
It enters the recovery device 11 through the switching valve 13 connecting the two. In the recovery device 11, the fluid flows from the inlet 6 in FIG.

During this process, the magnetic metal powder 16 that was uniformly mixed and distributed in the spiral pipe 4 at the inlet 6 as shown in FIG. As it moves through the conduit 4, it is attracted by a rotating magnetic field that moves at the same speed and relative speed as the fluid, and as shown in Fig. 5, the coil 1 side and the iron core 3 side in the helical conduit 4 are The concentration of metal powder increases, and the temperature at the center of the coil 1 and the iron core 3 becomes relatively colder.

At this time, the voltage or frequency applied to the coil 3 can be changed depending on the concentration of the metal powder or the fluid feeding speed, and the strength or rotation speed of the rotating magnetic field can be controlled, thereby achieving a suitable recovery of the metal powder.

In this way, the metal powder is transferred while being attracted by the rotating magnetic field to the iron side of the spiral pipe 4, the side of the coil 3, and the side of the coil I, so that the fluid and the metal powder can be separated with high efficiency. The fluid with a low metal powder concentration flows from the diversion port 8 in FIG. 5 to the outflow lower and is returned to the tank 9 for 1 hour. On the other hand, the metal powder is separated at the diversion port 8, and while being attracted by the rotating magnetic field,
It is automatically transferred into a donut-shaped collection box 5 connected by a packing 2.

A partition wall 17 is provided inside the collection box 5 as shown in FIG. 6 to prevent the transferred metal powder from circulating inside the collection box 5. Furthermore, since the metal powder in the collection box 5 is always pressed in the direction of the partition wall 17 by the action of the rotating magnetic field, the metal powder newly entering the collection box 5 is pushed between it and the partition wall 17. , and will be solidified. Therefore, the metal powder collected in the collection box 5 can always be accumulated at a high density.

The collection box 5 includes a holding plate 18 and bolts 1 as shown in FIG.
By attaching and detaching with 9, only the collection box 5 below the packing 2 can be taken out. By making the collection box 5 from a recyclable material, the collected metal powder can be collected, packed and handled.

In FIG. 3, when replacing the collection box 5, the switching valve I3 is throttled so that the fluid remaining inside the pump does not flow out from the collection box attachment port 14, and air is introduced into the collection box 5. The fluid in the collection box 5 is returned to the tank 9.

The metal powder recovery device according to the present invention has no moving parts or frictional parts, so it has an essentially long life and is excellent in maintainability.It also has a built-in removable collection box. Automatically uses a rotating magnetic field to handle the collected metal powder, such as packing and discarding it with a single touch.
It has the characteristic that the treatment of recovered metal powder is extremely easy.

In addition, the collection efficiency can be adjusted by changing the strength of the rotating magnetic field or the rotation speed of the rotating magnetic field, but by changing the flow rate of the pump, a metal powder concentration meter is installed in the piping system.
By assembling a control system, it can be used as an operating end of a metal powder concentration control device.

[Brief explanation of drawings]

1 to 6 are diagrams showing embodiments of the device of the present invention.
The figure is a partial cross-sectional view, Figure 2 is a cross-sectional view, Figure 3 is an overall view, Figure 4 is a cross-sectional view of the spiral tube, Figure 5 is a partially enlarged view of Figure 1, Figure 6 is Figure 1, FIG. 2 is a partially enlarged view of FIG. 2; 1; Coil for generating recirculating magnetic field 2: Packing 3; Iron core 4; Spiral pipe 5; Recovery box 6; Inflow port 7; Outflow port 8: Diversion port 9; Tank 10; Pump 11: Recovery device 12; Pipe Channel 13; Switching valve 14; Recovery box attachment/detachment port 15; Fluid 16: Metal powder 17: Partition wall

Claims (1)

[Scope of Claims] l A helical conduit formed by winding a flow path of a fluid containing magnetic metal powder in a spiral shape around an iron core, a coil capable of applying a rotating magnetic field in a direction along the helical conduit □; A device for collecting magnetic metal powder in a fluid, comprising a collection box detachably installed on the outlet side of a helical conduit. 2. An apparatus for recovering magnetic metal powder in a fluid according to claim 1, wherein a variable voltage power source is connected to the coil coil. 3. An apparatus for recovering magnetic metal powder in a fluid according to claim 1 or 2, wherein a variable frequency power source is connected to the coil.