JPH0999253A - Iron powder attraction magnet and iron powder attracting and removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron powder attracting magnet and a powder attracting and removing device capable of attracting and removing even a fine-powder magnetic material with high efficiency. SOLUTION: An iron powder attracting magnet 21 and a reticular filter 35 are placed in a shell 2 having an inlet 7, and a lid 3 provided with an outlet 13 is attached to form an iron powder attracting and removing device 1. The magnet 21 has an almost columnar shape, plural U-shaped circular grooves are formed on the periphery in the axial direction, and an inlet protrusion projecting in the axial direction is formed on the peripheral edge of the one end face in the axial direction. Plural protrusions projecting in the axial direction are furnished on the inner periphery side of the inlet protrusion at a position corresponding to the circulation groove. A radial passage directed toward the inlet protrusion is formed between the protrusions. A liq. is made turbulent by the protrusions on the end face of the magnet 21 and passed through the passage and then through the groove from between the inlet protrusions, and the magnetic material in the liq. is attracted and removed. A nonmagnetic material is collected by the filter 35 and removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron powder adsorption magnet and an iron powder adsorption removal device for adsorbing and removing magnetic substances in a liquid.

[0002]

2. Description of the Related Art Conventionally, for example, in a hydraulic mechanism such as a hydraulic cylinder used in a machine tool or a fuel supply mechanism for supplying fuel to an internal combustion engine such as an automobile engine or a generator, a liquid such as oil or fuel is used. There is known a configuration in which a mesh filter is provided in a pipe through which the oil flows, and magnetic substances such as iron powder mixed in the liquid are removed to prevent damage to the hydraulic cylinder, the carburetor, the engine, and the like. However, in this mesh filter, fine iron powder finer than the mesh width flows through, which is not preferable for hydraulic cylinders, carburetors, engines and the like. On the other hand, you can make the eyes narrower,
It is possible to use a paper filter or the like, but the pressure loss becomes large, the flow of liquid is obstructed, and clogging easily occurs.

Further, as a means for removing magnetic substances in the liquid, for example, a cylindrical iron powder adsorbing magnet 41 shown in FIGS. 5 and 6 is arranged in a pipe 42 such as a hydraulic mechanism or a fuel supply mechanism. It has been known.

[0004]

By the way, in the cylindrical iron powder attracting magnet 41 shown in FIGS. 5 and 6, a magnetic field is generated as shown in FIG. However, the magnetic flux 43a generated on the outer peripheral side does not participate in the adsorption of the magnetic substance in the liquid because the fluid does not contact the outer peripheral surface of the iron powder adsorbing magnet 41.
Only the magnetic flux 43b generated on the inner peripheral side of 41 is involved in the adsorption of the magnetic substance, and the total magnetic flux from the iron powder adsorption magnet 41 does not effectively act on the iron powder adsorption surface, and the adsorption removal rate of the magnetic substance is low. Also plumbing
The flow velocity of the liquid flowing through the pipe 42 is as shown in FIG.
The central part of is the fastest. Since the iron powder attracting magnet 41 is formed in a cylindrical shape, there is a problem that the magnetic substance in the liquid that flows through the inner peripheral side of the pipe 42 at a high speed is not easily attracted by the magnetic force.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an iron powder adsorption magnet and an iron powder adsorption / removal device capable of adsorbing and removing fine powdery magnetic substances with high efficiency.

[0006]

The iron powder adsorbing magnet according to claim 1 is an iron powder adsorbing magnet that adsorbs a magnetic substance mixed in a liquid, and is formed in a substantially columnar shape having a magnetic pole direction in the axial direction. The outer peripheral surface is provided with a plurality of flow grooves along which the liquid can flow along the axial direction, and the liquid flowing through the end surface is turbulent, and the liquid flows on the outer peripheral surface side where the liquid flow speed becomes slow. Since a circulation groove for circulation is provided, it is possible to prevent the liquid flow opening from becoming large and the flow velocity from increasing without reducing the magnetic force, and the flow velocity slows due to turbulence, facilitating adsorption of magnetic substances in the liquid. At the same time, the surface for adsorbing the magnetic substance on which the magnetic flux effectively acts is increased, and the adsorption removal rate of the magnetic substance is improved.

The iron powder attracting magnet according to claim 2 is the same as in claim 1.
In the iron powder adsorbing magnet according to the description, a plurality of protruding portions along the axial direction corresponding to the flow grooves on one end surface on the upstream side in the flow direction of the liquid in the axial direction, the projection size of which decreases toward the central axis. The liquid with the highest velocity that flows through the central portion of the pipe through which the liquid flows is guided to the central portion by the protrusion whose projection size decreases toward the central axis, and turbulent flow is generated in this central portion. Since the liquid flows through the flow grooves provided on the outer peripheral surface through the protrusions, the flow velocity of the liquid is further reduced, and the surface for adsorbing the magnetic substance on which the magnetic flux effectively acts is further increased. The removal rate is further improved.

The iron powder adsorption / removal device according to claim 3 is an iron powder adsorption / removal device which adsorbs and removes magnetic substances mixed in a liquid, and causes resistance when the liquid flows through to adsorb the magnetic substances. And a flow-through means which is provided in the flow-through suppression means and which causes the liquid to flow through, wherein the liquid does not flow over when passing through the flow-through means by the flow-through suppression means. Since it is suppressed to generate resistance, the adsorptivity of the magnetic substance of the flow-through suppressing means is improved.

According to a fourth aspect of the present invention, there is provided an iron powder adsorption / removal device in which the iron powder adsorption magnet according to the first or second aspect of the invention is provided with an inlet through which liquid flows in and an outlet through which liquid flows out at one end. And is formed into a substantially cylindrical shape, and is provided with a case body that houses the iron powder adsorbing magnet substantially coaxially. The iron powder adsorbing magnet can be easily attached to and detached from a pipe through which liquid flows, and maintenance is possible. Manageability is improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an iron powder adsorption / removal device of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an iron powder adsorption / removal device,
This iron powder adsorption / removal device 1 has a case body 4 composed of a body portion 2 and a lid portion 3. And the body part 2
Has a storage part 6 formed in a bottomed cylindrical shape with one end open, and a substantially cylindrical connection having a diameter smaller than that of the storage part 6 by opening an inflow port 7 at the tip at substantially the center of the bottom part of the storage part 6. Upper pipe section 8
Are integrally formed on the same axis and are formed in a substantially cylindrical shape with both ends open. Further, on the outer peripheral surface of the tip of the connection upper pipe portion 8,
A retaining portion 9 that bulges in an arc shape in the outer peripheral direction is provided. Further, a positioning rib 10 protruding like a collar is provided on the outer peripheral surface of the opening-side end of the storage section 6.

On the other hand, the lid portion 3 is provided with a lid portion 12 which is formed into a cylindrical shape with a bottom into which the opening side end portion of the housing portion 6 of the body portion 2 is fitted, and the lid portion 12 is provided substantially at the center of the bottom portion. A connecting lower pipe portion 14 having the same diameter as the connecting upper pipe portion 8 of the body portion 2 and having an opening 13 at the tip end is formed coaxially and integrally, and is formed in a substantially cylindrical shape with both ends opened. A retaining portion 9 is formed on the outer peripheral surface of the distal end of the connecting lower pipe portion 14 so as to bulge out like the connecting upper pipe portion 8.
Further, a substantially cylindrical step portion 15 having a diameter larger than the inner diameter of the connecting lower pipe portion 14 is formed substantially at the center of the bottom surface of the lid portion 12. The opening side of the storage portion 6 of the body portion 2 is covered with the lid portion 12 of the lid portion 3.
The case body 4 is formed by fitting and fusion-bonding to the opening side and forming a storage chamber 16 inside.

Further, in the storage chamber 16 of the case body 4, there is stored an iron powder attraction magnet 21 which is a flow-through suppressing means for generating a resistance when the liquid flows through and adsorbing a magnetic substance. As shown in FIGS. 1 to 3, the iron powder attracting magnet 21 is formed of a magnetic material in a substantially columnar shape, and serves as a flow-through means through which liquid can flow in a U groove along the axial direction on the outer peripheral surface. A plurality of distribution grooves 22 are formed. Further, a retaining rib 23 is provided on the outer peripheral surface of the iron powder attracting magnet 21 in the shape of a wall having a semicircular cross section along the axial direction in which the tip end contacts the inner peripheral surface of the housing portion 6.

A dome portion 24, which is recessed in a concave arc shape, is formed on one end surface of the iron powder attraction magnet 21 in the axial direction. In addition, at the outer peripheral edge of the other end surface of the iron powder attracting magnet 21 in the axial direction, there is provided a projecting protrusion 25 that projects along the axial direction so as to be continuous in an annular shape in the circumferential direction. Then, these calling protrusions 25,
25 has a trumpet surface 26 that is inclined so as to expand in the axial direction in a trumpet shape.

Further, on the other end surface of the iron powder attracting magnet 21, a plurality of projections 28, 28 projecting along the axial direction are formed at positions corresponding to the flow grooves 22 on the inner peripheral side of the intake projection 25. A radial flow path 29 is formed between the protrusions 28, 28 toward the intake surface 26 of the intake protrusion 25. The protrusions 28, 28 are provided with tapered surfaces 30 that are inclined so as to expand in a trumpet shape in the axial direction, like the intake protrusions 25. A space 31 is formed. Furthermore, the protrusion 28
Has a contact surface that abuts the bottom of the storage section 6.
32 are provided.

Further, 35 is a mesh filter, and this mesh filter 35 is formed in a hemispherical shape having substantially the same curvature as the curvature of the dome portion 24 of the iron powder attracting magnet 21, and the tip of the body portion 2 is formed at the peripheral edge. A collar-shaped mounting portion 36 which is sandwiched between the lid body 3 and the bottom surface of the lid portion 12.
Is provided.

In the iron powder attracting magnet 21, the contact surface 32 of the protrusion 28 is brought into contact with the bottom surface of the housing portion 6 to form a turbulent flow space 31, and the holding rib 23 is formed on the inner peripheral surface of the housing portion 6. The outer peripheral surface of the iron powder attracting magnet 21 is inserted and fixed in the storage portion 6 so as to face the inner peripheral surface of the storage portion 6 with a gap therebetween. Then, the mesh filter 35 is positioned on the dome portion 24 of the iron powder attracting magnet 21, and the mesh filter is provided at the tip of the body portion 2 to which the iron powder attracting magnet 21 is fixed and the bottom surface of the lid portion 12 of the lid portion 3. The iron powder adsorption / removal apparatus 1 is configured by sandwiching and fixing the mounting portion 36 of 35 and welding and joining the body portion 2 and the lid portion 3 together.

Further, the iron powder adsorption / removal device 1 includes a hydraulic mechanism such as a hydraulic cylinder used for a machine tool (not shown), a fuel supply mechanism for supplying fuel to an internal combustion engine such as an automobile engine or a generator, and the like. In the pipe 37 through which a liquid such as oil or fuel mixed with magnetic substances such as powder flows, that is, the connecting upper pipe portion 8 of the storage unit 6 is fitted to the upstream end of the pipe 37, and the downstream side of the pipe 37. Connecting lower pipe part of the lid part 3 at the side end
14 are fitted and fixed. The retaining portions 9, 9 of the connecting upper pipe portion 8 and the connecting lower pipe portion 14 are pressed against the inner peripheral surface so as to increase the diameter of the pipe 37 and prevented from coming off. In addition, the connection upper pipe portion 8 and the connection lower pipe portion 14 and the pipe 37,
A connecting and fixing means such as a binding tool (not shown) may be further provided at the joint with 37.

Next, the operation of the above embodiment will be described.

The iron powder adsorption / removal device 1 in which the iron powder adsorption magnet 21 and the mesh filter 35 are stored in advance is arranged in the middle of a pipe 37 such as a hydraulic mechanism or a fuel supply mechanism (not shown).
Then, a liquid containing a magnetic substance (not shown) flows through the pipe 37 and flows into the iron powder adsorption / removal device 1. That is, piping
The liquid flows into the turbulent flow space 31 from the inflow port 7 of the connecting upper pipe portion 8 of the housing portion 6 of the body portion 2 connected to the 37 through the connecting upper pipe portion 8. Then, the liquid flows in the vicinity of the center of the turbulent flow space 31 while being guided by the tapered surface 30 of the protrusion 28, abuts against the end surface of the iron powder attraction magnet 21, and flows backward so as to be diffused at the tapered surface 30, Turbulence occurs in this turbulent space 31. further,
A part of the liquid in the turbulent flow space 31 in which the turbulent flow is generated is guided through the flow path 29 to the call-in surface 26 of the call-in projection 25, and the call-in projection 25,
It flows like a stitch between 25 and flows from the flow groove 22 to the dome portion 24.

When the liquid is turbulent in the turbulent space 31,
Between the protrusions 28, 28, between the protrusion protrusions 25, 25, between the protrusion 28 and the protrusion protrusion 25
And the flow groove 22, and when flowing between the outer peripheral surface of the iron powder adsorbing magnet 21 and the pipe 37, the magnetic force of the iron powder adsorbing magnet 21 causes magnetic properties such as iron powder mixed in the liquid. The substance is adsorbed on the surface of the iron powder adsorption magnet 21 and removed.

Then, the liquid flowing into the dome portion 24 flows through the mesh filter 35, further flows through the connecting lower pipe portion 14, and then flows from the outlet 13 to the pipe 37. A mesh filter
At the time of the flow of 35, the non-magnetic impurities mixed in the liquid are also captured and removed by the mesh filter 35.

In addition, when a magnetic substance is adsorbed to the iron powder adsorbing magnet 21 to some extent by long-term use and the adsorbed magnetic substance may be peeled off when used further, or the distribution rate of the mesh filter 35 is reduced due to impurities. If you start
The iron powder adsorption / removal device 1 is removed from 37, and the separate iron powder adsorption / removal device 1 is installed in the pipe 37.

According to the above embodiment, the iron powder attracting magnet
Since the circulation groove 22 through which the liquid circulates is provided on the outer peripheral surface of 21, the turbulent flow occurs when the center portion of the pipe 37, which has the fastest flow, comes into contact with the end face, and the flow-through speed of the liquid becomes slow. The magnetic substance mixed in the iron powder is easily attracted to the iron powder attraction magnet 21. Further, as compared with the conventional iron powder adsorbing magnet in which the liquid flow-through portion is in the center, the liquid flow-through portion is provided on the outer peripheral surface, so that the magnetic force of the iron powder adsorbing magnet 21 is not reduced. It is possible to widen the flow opening of the liquid, and the liquid is iron powder adsorption magnet 21
It is possible to prevent the flow velocity from further increasing when flowing through
Further, the iron powder adsorption property can be improved. Therefore, the iron powder adsorption / removal rate can be significantly improved as compared with the conventional case.

Further, a taper surface 30 is provided at the end of the iron powder adsorbing magnet 21 on the liquid inflow side so that the projecting dimension becomes smaller toward the central axis, and the tip of the taper surface 30 abuts the bottom surface of the accommodating portion 6.
Since a plurality of protrusions 28 are formed along the axial direction, a turbulent space 31 in which the inflowing liquid causes a turbulent flow is formed, and the turbulent liquid is sewn up to the flow groove 22 by the protrusion 28 and the intake protrusion 25. Thus, the magnetic substance in the liquid is more easily adsorbed by the iron powder adsorption magnet 21, and the iron powder adsorption / removal rate can be further improved.

Further, the iron powder adsorption magnet 21 is not directly arranged in the pipe 37 but is housed in the case body 4 to constitute the iron powder adsorption removal device 1, and the iron powder adsorption removal device 1 is installed in the pipe 37. Since it is provided, the workability can be improved and the maintenance management can be facilitated.

Further, the mesh filter 35 is replaced with an iron powder adsorption magnet.
Since it is housed in the case body 4 together with 21, it is possible to remove not only magnetic substances but also foreign substances which are non-magnetic substances that are not attracted to the iron powder attracting magnet 21.

Although the mesh filter 35 is used in the above embodiment, most of the magnetic substances are adsorbed and removed by the iron powder adsorbing magnet 21, so that clogging can be prevented even by using a paper filter or the like. By using this paper filter or the like, which does not occur frequently, even fine magnetic substances can be reliably removed. Further, the mesh filter 35 is made of a magnetic material so that the magnetic substance not adsorbed by the iron powder adsorption magnet 21 is adsorbed and removed by its own magnetic force or the magnetic force generated by the magnetic field of the iron powder adsorption magnet 21. But you can.
Thereby, the iron powder adsorption removal rate can be further improved.

Further, although the iron powder adsorption magnet 21 and the mesh filter 35 are housed in the case body 4 to constitute the iron powder adsorption / removal device 1 in the above description, only the iron powder adsorption magnet 21 is housed. The iron powder attracting magnet 21 may be directly arranged in the pipe 37.

On the other hand, a joining means (not shown) for detachably and fluid-tightly joining the body portion 2 and the lid body portion 3 to each other may be provided to form the case body 4 detachably. According to this configuration, it is easy to remove the adsorbed magnetic substance and the trapped foreign substances by removing the body portion 2 and the lid portion 3, and the iron powder adsorption / removal device 1 can be easily reused and the operating cost can be reduced. Can be reduced.

[0031]

[Example] The outflowing iron powder limit amount of the iron powder adsorbing magnet 21 of the above embodiment, that is, the inflowing iron powder amount when the inflowing fine iron powder flows out without being adsorbed by the iron powder adsorbing magnet 21 The upper limit was measured. In addition, this measurement is based on JIS-D-1608, the weight of the iron powder adsorption magnet 21 is 5.0 g, the particle size of the iron powder used is 10 μm to 50 μm, and the flow rate of the liquid is 40 l / hour. went. Also, FIGS.
The conventional cylindrical iron powder adsorbing magnet shown in (4) was used as a comparative sample.
FIG. 4 shows the results.

From the results shown in FIG. 4, the conventional cylindrical iron powder adsorbing magnet can adsorb up to 0.18 g of iron powder, whereas the iron powder adsorbing magnet of the present embodiment can adsorb up to 0.42 g. It can be seen that iron powder can surely be adsorbed and removed, and twice or more iron powder can be adsorbed and removed as compared with the conventional one.

[0033]

According to the iron powder attracting magnet of claim 1,
Since a plurality of circulation grooves along which the liquid can flow along the axial direction are provided on the outer peripheral surface of the substantially cylindrical shape, which is the outer peripheral surface side where the liquid flow velocity becomes slow, a large liquid flow opening can be obtained without reducing the magnetic force. It is possible to prevent the flow velocity from increasing and the flowing liquid is turbulent at the end face to slow down the flow velocity, making it easier to adsorb the magnetic substance in the liquid and adsorbing the magnetic substance on which the magnetic flux effectively acts. Can be increased, and the adsorption removal rate of magnetic substances can be improved.

According to the iron powder attracting magnet of the second aspect, in addition to the iron powder attracting magnet of the first aspect, a plurality of protrusions are provided along the axial direction at the end face on the upstream side in the axial direction corresponding to the flow grooves. Since the protrusion with a smaller protrusion size is provided toward the central axis, the magnetic substance adsorption surface on which the magnetic flux effectively acts can be further increased, and the multiple protrusions allow the fastest liquid to flow in the central portion of the pipe. The turbulent flow is made in the central part, and it is made to pass through between the protrusions to the flow groove provided on the outer peripheral surface, so that the flow velocity of the liquid is further slowed down, and the adsorption amount of the magnetic substance near the protrusions which slows down this flow velocity is The magnetic substance can be increased, and the adsorption rate of the magnetic substance can be further improved.

According to the iron powder adsorption / removal device of the third aspect, the flow-through suppressing means for adsorbing the magnetic substance, which is provided with the flow-through means for allowing the liquid to flow through, causes resistance during the flow of the liquid. The adsorbability of magnetic materials can be improved.

According to the apparatus for adsorbing and removing iron powder according to claim 4, the iron powder adsorbing magnet and the substantially cylindrical shape having the inflow port through which the liquid flows in open at one end and the outflow port through which the liquid flows out at the other end. Since the iron powder adsorbing magnet according to claim 1 or 2 is housed in the case body substantially coaxially, the iron powder adsorbing magnet can be easily attached to and detached from the pipe through which the liquid flows, and the maintainability can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a state where an iron powder adsorption / removal device according to an embodiment of the present invention is arranged in a pipe.

FIG. 2 is a sectional view of the same.

FIG. 3 is a side sectional view in the vicinity of the same iron powder attraction magnet as above.

FIG. 4 is a graph showing the results of measuring the limit amount of iron powder flowing out.

FIG. 5 is a cross-sectional view showing a state in which a conventional iron powder adsorption magnet is arranged in a pipe.

FIG. 6 is an explanatory diagram showing a relationship between flow velocities.

[Explanation of symbols]

 1 Iron powder adsorption / removal device 4 Case body 7 Inlet 13 Outlet 21 Iron powder adsorbing magnet serving as a flow-through suppressing means 22 Flow groove 28 as a flow-through means 28 Projection

Claims (4)

[Claims] 1. An iron powder adsorption magnet for adsorbing a magnetic substance mixed in a liquid, which is formed in a substantially columnar shape having a magnetic pole direction in the axial direction, and the liquid can flow along the axial direction on an outer peripheral surface. An iron powder attracting magnet having a plurality of flow grooves. 2. A plurality of protrusions are provided on one end face on the upstream side in the axial flow direction of the liquid in the axial direction so as to correspond to the flow grooves and project in the axial direction so as to reduce the protrusion dimension toward the central axis. The iron powder adsorption magnet according to claim 1, 3. An iron powder adsorption / removal device for adsorbing and removing a magnetic substance mixed in a liquid, and a flow-through suppressing device for generating resistance during the flow-through of the liquid to adsorb the magnetic substance, An iron powder adsorption / removal device comprising: a flow-through means that is provided in a suppression means and that allows the liquid to flow through. 4. The iron powder adsorbing magnet according to claim 1 or 2, which is formed into a substantially cylindrical shape by opening an inflow port through which liquid flows in at one end and an outflow port through which liquid flows out at the other end, An iron powder adsorption / removal device comprising: a case body that houses an iron powder adsorption magnet substantially coaxially.