JP2015036136A - Magnet filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to improve a capacity of removing magnetic powder and particles contained in a working fluid, and to facilitate assembly even if a permanent magnet having a high magnetic force is adopted.SOLUTION: Provided is a magnet filter capable of increasing a surface area of capturing magnetic powder and particles contained in a working fluid by magnetizing a magnetic casing and a magnetic top cover with a permanent magnet while facilitating assembly even if a permanent magnet having a high magnetic force is adopted.

Description

  The present invention relates to a magnet filter that removes magnetic particles in hydraulic fluid flowing in a hydraulic circuit and maintains the performance of a hydraulic control device.

  In hydraulic control equipment, there are a lot of equipment that control performance deteriorates due to damage of sliding surface or clogging when magnetic powder such as iron powder is present in hydraulic oil. Yes. In order to maintain the performance of hydraulic control equipment, a magnetic filter particle is usually included in the hydraulic oil by installing a magnet filter (also called a magnet filter or magnetic filter) in the hydraulic piping connected to the hydraulic control equipment. To be removed. As a form of the magnet filter installed in the hydraulic circuit, a rod-shaped permanent magnet is housed in a cylindrical casing, and hydraulic oil is allowed to flow through an oil passage between the rod-shaped permanent magnet and the casing, so that magnetic particles There is one that is captured on the surface of a rod-shaped permanent magnet.

FIG. 6 is a cross-sectional view of a conventional magnet filter similar to the above-described magnet filter.
Reference numeral 1 denotes a casing formed in a bottomed cylindrical shape, and a rod-shaped magnet (hereinafter referred to as a permanent magnet) 3 is accommodated in an oil passage portion 2 formed in an internal space of the casing 1, and the permanent magnet 3 is a casing. It is supported by being screwed into an upper lid 4 that closes an opening of one of them. An inlet pipe 5 that guides the hydraulic oil to the inside and an outlet pipe 6 that flows out the hydraulic oil from which the magnetic particles have been removed are attached to the upper lid 4 by welding or the like.

  By the way, this magnet filter has a casing 1 other than the permanent magnet 3, the upper lid 4, the inlet pipe 5 and the outlet pipe so that the permanent magnet 3 is not attracted to other parts when the permanent magnet 3 is inserted into the casing 1. 6 and other components are made of non-magnetic material to facilitate assembly work.

JP-A-7-275619

  As described above, the magnet filter shown in FIG. 6 is made of non-magnetic components other than the capture portion made of the permanent magnet 3 for the purpose of easy assembly. The removal performance of the powder particles must depend on the surface area and magnetic force of the magnet. For this reason, in the magnet filter of the form shown in FIG. 6, in order to ensure the surface area of a magnet, there existed a subject that it was difficult to reduce in size. In addition, as a method to increase the capture area of the magnetic particles contained in the hydraulic oil, a high magnetic permanent magnet such as neodymium is adopted as the permanent magnet, and the magnetic structure is within the range where the magnetic force of the high magnetic permanent magnet affects. A method of arranging the above is conceivable. However, when a high-magnetism permanent magnet is used, the permanent magnet has a large magnetic force, so that the permanent magnet and the casing may be adsorbed, which makes it difficult to assemble the magnet filter.

  Accordingly, the present invention has been made to solve the above-described problems. The main components such as a casing and an upper lid for housing a permanent magnet are made of a magnetic material, and the main components such as the casing and the upper lid are made permanent. A structure that can be easily assembled even if a high-magnetism permanent magnet is used while increasing the capture surface area of the magnetic powder particles contained in the hydraulic fluid by arranging and magnetizing the magnet within the range affected by the magnet's magnetic force An object of the present invention is to provide a magnet filter.

  In order to solve the above-mentioned problems, the magnet filter of the present invention has a cylindrical shape in which an internal space is formed as an oil passage, an inlet and an outlet for hydraulic oil are formed in the oil passage, and an opening is formed at one end. A magnetic casing, a magnetic upper lid that is oil-tightly attached to the opening of the casing, and an end portion of the upper lid that is attached to the inner wall surface of the upper lid in a substantially vertical state. A rod-shaped permanent magnet that is exposed to hydraulic oil, and a non-magnetic guide that prevents contact between the permanent magnet and the inner peripheral surface of the casing when the permanent magnet is inserted into the oil passage portion. The casing and the upper lid are magnetized by the permanent magnet, and the outer peripheral surface of the permanent magnet, the inner peripheral surface of the casing, and the inner wall surface of the upper lid are made of magnetic powder particles contained in the hydraulic oil. On the capture surface And wherein the door.

  According to the present invention, since the casing and the upper lid are magnetized by the magnetic force of the permanent magnet by strengthening the magnetic force of the permanent magnet, the capture area of the magnetic powder particles in the oil passage portion is added to the outer peripheral surface of the permanent magnet, It can be expanded to the inner peripheral surface of the casing and the inner wall surface of the upper lid. Moreover, since the periphery of the permanent magnet is surrounded by a guide member made of a non-magnetic material, it is possible to prevent the permanent magnet from contacting the inner peripheral surface of the casing when the permanent magnet is inserted into the casing and assembled. it can.

It is a block diagram of the magnet filter which concerns on the 1st Embodiment of this invention, (a) is a top view, (b) is side sectional drawing, (c) is a perspective view which shows a permanent magnet, an upper cover, and a guide rod. is there. It is a block diagram of the magnet filter which concerns on the 2nd Embodiment of this invention, (a) is side sectional drawing, (b) and (c) are perspective views which show a different guide sleeve, (d) is (a). It is an enlarged view of a broken-line circle part. It is a block diagram of the magnet filter which concerns on the 3rd Embodiment of this invention, (a) is side sectional drawing, (b) is a perspective view which shows a guide sleeve, (c) is a broken-line circle part of (a). It is an enlarged view. The cross-sectional block diagram of the magnet filter which concerns on the 4th Embodiment of this invention. It is a block diagram of the magnet filter which concerns on the 5th Embodiment of this invention, (a) is side sectional drawing, (b) is a perspective view of the principal part. The cross-sectional block diagram of the conventional magnet filter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is provided to the same part through each figure, and the overlapping description is abbreviate | omitted suitably.

(First embodiment)
FIG. 1 is a configuration diagram of a magnet filter according to a first embodiment of the present invention, where (a) is a plan view, (b) is a side sectional view, and (c) is a permanent magnet, an upper lid, and a guide rod. It is a perspective view.

  In FIG. 1, reference numeral 1A denotes a magnet filter casing, which is formed in a bottomed cylindrical shape by a magnetic material. In the casing 1, the internal space is formed as the oil passage portion 2 by installing the hydraulic oil inlet pipe 5 near the bottom and the outlet pipe 6 near the opening. 1F is a flange provided integrally on the outer periphery of the opening of the casing 1.

  4A is a disk-shaped upper lid that closes the opening of the cylindrical casing 1 and uses the inside of the casing 1 as a pressure vessel, and is formed of a magnetic material. The upper lid 4A is oil-tightly attached to the flange 1F when the magnet filter is assembled, and is removed during maintenance. The upper lid 4A is configured not only to block the opening of the casing 1 but also to support the rod-shaped permanent magnet 3 and one end of a non-magnetic guide member on its inner wall surface.

  That is, the upper lid 4A supports the one end portion of the rod-like permanent magnet 3 in a substantially vertical state at the center portion of the inner wall surface thereof, and is arranged in parallel so as to surround the permanent magnet 3 at equal intervals. One end portions of four guide rods 7 as body-made guide members are supported in a substantially vertical state. Thus, the permanent magnet 3 and the guide bar 7 are arranged in parallel. The permanent magnet 3 and the guide rod 7 are inserted into the oil passage portion 2, and are exposed to the working oil when the magnet filter is in operation.

  The non-magnetic guide rod 7 is used to prevent the permanent magnet 3 from being attracted to the inner peripheral surface of the casing 1A when the rod-shaped permanent magnet 3 is inserted into the casing 1A when the magnet filter is assembled. It is provided. And although the front-end | tip part which is the other end part of these permanent magnet 3 and the guide bar 7 has provided the slight clearance gap between the bottom part of the oil channel | path part 2, you may make it contact the bottom part. The permanent magnet 3 is strengthened so that the casing 1A and the upper lid 4A can be magnetized by its own magnetic flux such as neodymium.

  When assembling the magnet filter of this embodiment, first, one end of the permanent magnet 3 is attached to the center of the inner wall surface of the upper lid 4A, and one end of the four guide rods 7 is attached to the periphery thereof. The state shown in (c) is kept. Next, the end of the permanent magnet 3 and the guide rod 7 in the state shown in FIG. 1 (c) is inserted from the opening of the casing 1A. When the state shown in FIG. 1 (b) is reached, the upper lid 4A and the flange 1F are illustrated. Fix with fixing means such as bolts. Thus, the inside of the casing 4A becomes a pressure vessel.

  In the process of inserting the permanent magnet 3, an attractive force acts between the permanent magnet 3 and the casing 1 </ b> A by the magnetic force of the permanent magnet 3, but the periphery of the permanent magnet 3 is surrounded by a guide rod 7 made of a nonmagnetic material. Therefore, the permanent magnet 3 does not contact the inner peripheral surface of the casing 1 and can be assembled in the state shown in FIG.

  In the magnet filter assembled as described above, the hydraulic oil flowing in from the inlet pipe 5 on the bottom side of the casing 1A is in an internal space formed between the inner peripheral surface of the casing 1A and the outer peripheral surface of the permanent magnet 3. It passes through a certain oil passage 2 to reach the upper outlet pipe 6 and flows out of the magnet filter. The magnetic powder particles contained in the hydraulic oil are moved in the oil passage portion 2 from the inlet pipe 5 to the outlet pipe 6 in the inner peripheral surface of the casing 1A, the outer peripheral surface of the permanent magnet 3, and the inner lid 4A. When adsorbed and captured by the wall surface and flows out from the outlet pipe 6, most of the magnetic powder particles are removed.

  As described above, the magnet filter of the present embodiment strengthens the magnetic force of the permanent magnet 3 and magnetizes the casing 1A and the upper lid 4A by the magnetic force of the permanent magnet 3. In addition to the outer peripheral surface of the permanent magnet 3, the capture area of the powder particles increases to the inner peripheral surface of the casing 1A and the inner wall surface of the upper lid 4A. At the time of assembling the magnet filter, an attractive force acts between the casing 1A and the permanent magnet 3 by the magnetic force of the permanent magnet 3, but the periphery of the permanent magnet 3 is surrounded by a guide rod 7 made of a nonmagnetic material. Therefore, it can prevent that the inner peripheral surface of casing 1A and the permanent magnet 3 contact, and can ensure the ease of an assembly.

  In FIG. 1, the casing 1 </ b> A has a bottomed cylindrical shape, but is not limited to a cylindrical shape, and may be a bottomed polygonal cylindrical shape. You may make it the structure which forms an opening part and plugs each edge part with an upper cover and a lower cover.

(Second Embodiment)
FIG. 2 is a configuration diagram of a magnet filter according to a second embodiment of the present invention, in which (a) is a side sectional view, (b) and (c) are perspective views showing different guide sleeves, and (d ) Is an enlarged view of a broken-line circle portion of (a).

  2 (a) to 2 (d), this embodiment differs from the first embodiment (FIG. 1) in that four guide rods that are nonmagnetic guide members around the permanent magnet 3 are used. 7 is characterized in that a cylindrical guide sleeve 8a or 8b made of a non-magnetic material and having a plurality of holes on the circumferential surface is installed. This is the same as the embodiment.

  The guide sleeve 8a or 8b made of a nonmagnetic material has one end fixed to the inner wall surface of the upper lid 4A concentrically with the permanent magnet 3, and the other end fixed to the bottom of the casing 1A as shown in FIG. It is fixed. Furthermore, the guide sleeve 8a or 8b is provided with a plurality of holes 9 of an appropriate size in the longitudinal direction on the circumference. This hole 9 is for allowing hydraulic oil to pass through.

  When assembling the magnet filter of the present embodiment, one end of the permanent magnet 3 is attached to the center of the inner wall surface of the upper lid 4A, and one end of the cylindrical guide sleeve 8a or 8b is attached concentrically with the permanent magnet 3. deep. Next, the permanent magnet 3 and the tip of the guide sleeve 8a or 8b are inserted through the opening of the casing 1A, and the tip of the guide sleeve 8a or 8b is provided at the bottom of the casing 1A as shown in FIG. 2A, the upper lid 4A and the flange 1F are fixed by a fixing means such as a bolt (not shown).

  In the process of inserting the permanent magnet 3, an attractive force acts between the permanent magnet 3 and the casing 1A by the magnetic force of the permanent magnet 3, but the periphery of the permanent magnet 3 is a guide sleeve 8a made of a non-magnetic material or Since it is surrounded by 8b, the permanent magnet 3 does not contact the inner peripheral surface of the casing 1A, and can be assembled in the state shown in FIG.

  The cylindrical guide sleeve 8a or 8b is not fixed at one end to the upper lid 4A, but the other end is fitted in an annular groove 10 provided in the bottom of the casing 1A in advance, and a rod-shaped permanent sleeve is later installed. The magnet 3 may be inserted.

  In the magnet filter assembled as described above, the hydraulic oil flowing in from the inlet pipe 5 on the bottom side is between the inner peripheral surface of the casing 1A and the outer peripheral surface of the guide sleeve 8a or 8b, and between the guide sleeve 8a or 8b. It passes through the oil passage portion 2 between the inner peripheral surface and the outer peripheral surface of the permanent magnet 3, reaches the upper outlet pipe 6, and flows out of the magnet filter. The magnetic particles contained in the hydraulic oil are adsorbed and captured on the inner peripheral surface of the casing 1A, the outer peripheral surface of the permanent magnet 3, and the inner wall surface of the upper lid 4A in the process of moving from the inlet pipe 5 to the outlet pipe 6, respectively. Therefore, when it flows out from the outlet pipe 6, most of the magnetic substance particles are removed.

  As described above, according to this embodiment, the outer periphery of the permanent magnet 3 is concentrically surrounded by the cylindrical guide sleeve 8a or 8b at a predetermined distance, and the outer peripheral surface side of the guide sleeve 8a or 8b. Since the hydraulic oil is allowed to flow through the oil passage portion 2 and the oil passage portion 2 on the inner peripheral surface side, the capture area of the magnetic powder particles in the oil passage portion 2 is the casing 1A in addition to the outer peripheral surface of the permanent magnet 3. Increases to the inner peripheral surface and the inner wall surface of the upper lid 4A. At the time of assembling the magnet filter, an attractive force acts between the casing 1A and the permanent magnet 3 due to the magnetic force of the permanent magnet 3, but a cylindrical shape having a plurality of holes around the permanent magnet 3 on the circumferential surface. Since it is surrounded by the guide sleeve 8a or 8b, it is possible to prevent the inner peripheral surface of the casing 1A from coming into contact with the permanent magnet 3 during the assembly of the magnet filter, and to ensure the ease of assembly. it can.

(Third embodiment)
FIG. 3 is a configuration diagram of a magnet filter according to a third embodiment of the present invention, in which (a) is a side sectional view, (b) is a perspective view showing a guide sleeve, and (c) is (a). It is an enlarged view of a broken-line circle part.

  In FIG. 3, this embodiment differs from the second embodiment (FIG. 2) in that a magnetic punch metal 11 is formed on the outer peripheral surface of a nonmagnetic guide sleeve 8b which is a nonmagnetic guide member. And the punch metal 11 is magnetized by the permanent magnet 3, and the other points are the same as in the second embodiment.

  The mechanism by which the magnet filter according to this embodiment captures magnetic powder particles is the same as in the second embodiment, but in this embodiment, a magnetic punch metal 11 is provided on the outer peripheral surface of the nonmagnetic guide sleeve 8b. Therefore, in addition to the inner peripheral surface of the casing 1A and the inner wall surface of the upper lid 4A, the magnetic powder particles can be captured also on the outer peripheral surface of the punch metal 11, and the magnetic powder particles can be captured more than in the second embodiment. The area can be increased.

(Fourth embodiment)
FIG. 4 is a configuration diagram of a magnet filter according to a fourth embodiment of the present invention.
In FIG. 4, this embodiment differs from the embodiment (FIG. 1) in that a circle made of a non-magnetic material is used instead of installing a plurality of guide rods 7 which are non-magnetic material guide members. The plate-like guide cap 12 is preliminarily installed at the tip of the permanent magnet 3, and the other points are the same as in the first embodiment.

  The disc-shaped guide cap 12 has an outer diameter smaller than the inner diameter of the bottom portion of the casing 1A by an amount of fitting, and a fitting portion 12a for fitting the tip portion of the permanent magnet 3 is provided at the center portion. Yes.

  When assembling the magnet filter of this embodiment, first, one end of the permanent magnet 3 is attached to the center of the inner side surface of the upper lid 4A, and the fitting portion 12a is fitted into the other end of the permanent magnet 3. Next, the guide cap 12 is inserted from the opening of the casing 1A, and when the guide cap 12 reaches the bottom of the casing 1A as shown in FIG. 4, the upper lid 4A and the flange 1F are fixed by fixing means such as bolts.

The mechanism by which the magnet filter according to the present embodiment captures magnetic powder particles is the same as in the first embodiment (FIG. 1).
According to this embodiment, it is possible to prevent the permanent magnet 3 and the casing 1A from being magnetically attracted at the time of assembling only by fitting the disc-shaped guide cap 12 to the tip of the permanent magnet 3, thereby facilitating assembling. Secure.

(Fifth embodiment)
5A and 5B are configuration diagrams of a magnet filter according to a fifth embodiment of the present invention, in which FIG. 5A is a side sectional view and FIG. 5B is a perspective view of a main part.

This embodiment differs from the first embodiment (FIG. 1) in that a guide made of a non-magnetic material is provided at the tip of the permanent magnet 3 instead of installing a plurality of guide rods 7 around the permanent magnet 3. The member is characterized in that a plurality of non-magnetic ribs 13 are provided at equal intervals, and the other points are the same as in the first embodiment.
In the example of FIG. 5, four ribs 13 are installed at equal intervals in the circumferential direction of the tip outer peripheral portion of the permanent magnet 3 by an adhering means such as adhesion or welding.

The mechanism by which the magnet filter according to the present embodiment captures magnetic powder particles is the same as in the first embodiment (FIG. 1).
According to the present embodiment, it is possible to ensure the ease of assembly with a simple structure in which the four ribs 13 are installed at equal intervals in the circumferential direction at the tip of the permanent magnet 3.

  Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1A ... Casing, 1F ... Flange, 2 ... Oil passage part, 3 ... Permanent magnet, 4A ... Upper lid, 5 ... Inlet pipe, 6 ... Outlet pipe, 7 ... Guide rod, 8a, 8b ... Guide sleeve, 9 ... Hole, 10 An annular groove, 11 a punch metal, 12 a guide cap, 12a a fitting part, 13 a rib.

Claims (6)

An internal space portion is formed as an oil passage portion, a hydraulic fluid inlet and outlet are formed in the oil passage portion, and a cylindrical magnetic casing having an opening at one end portion;
An upper lid made of a magnetic material that is oil-tightly attached to the opening of the casing;
A rod-shaped permanent magnet that is inserted into the oil passage portion and exposed to hydraulic oil in a state where one end is attached to the inner wall surface of the upper lid in a substantially vertical state;
A non-magnetic guide member that prevents contact between the permanent magnet and the inner peripheral surface of the casing when the permanent magnet is inserted into the oil passage portion;
The casing and the upper lid are magnetized by the permanent magnet, and the outer peripheral surface of the permanent magnet, the inner peripheral surface of the casing, and the inner wall surface of the upper lid are used as trapping surfaces for the magnetic powder particles contained in the hydraulic oil. Features a magnetic filter.   The magnet filter according to claim 1, wherein the guide member is composed of a plurality of guide bars parallel to the permanent magnet.   The magnet filter according to claim 1, wherein the guide member includes a guide cap that is fitted to the other end of the permanent magnet.   The magnet filter according to claim 1, wherein the guide member is configured by a rib installed on an outer periphery of the other end of the permanent magnet.   The magnet filter according to claim 1, wherein the guide member is configured by a guide sleeve that is arranged substantially concentrically with the permanent magnet and has a plurality of holes.   6. The magnet filter according to claim 5, wherein an outer peripheral surface of the guide sleeve is covered with a punch metal made of a magnetic material, and the punch metal is magnetized by the permanent magnet.

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