Magnetic foreign matter removing device

Abstract

To provide a magnetic foreign matter removing device capable of flexibly adjusting the intensity of a magnetic field acting on a flow passage according to the property or the like of a fluid.SOLUTION: A magnetic foreign matter removing device 10 according to the present invention includes: a case 15 in which are formed an introduction port 22a for introducing a fluid, a discharge port 23a for discharging the fluid, and a flow passage R1 communicating with the introduction port 22a and the discharge port 23a for allowing the fluid to flow therethrough; and magnetic members 58, 68 made of permanent magnets; where a pair of flow passage forming walls 25, 43 forming a flow passage R1 are arranged in the case 15, and both of the magnetic members 58, 68 are held at predetermined positions by advancing / retreating means for changing distances to magnetic member abutting surfaces 28a, 43a.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a magnetic foreign matter removal device for removing magnetic foreign matter from a fluid containing magnetic foreign matter by adsorbing the magnetic foreign matter using a magnetic field. [Background technology]

[0002] Fluids may contain magnetic foreign matter, which usually needs to be removed because they affect the properties and performance of the fluid.

[0003] As an example of an apparatus for removing magnetic foreign matter from a fluid, the following Patent Document 1 describes a foreign matter removal device having an inlet for introducing a fluid containing magnetic foreign matter, an outlet for discharging the fluid from which the foreign matter has been removed, a fluid transfer passage connecting the inlet and the outlet, a storage section for storing a flat permanent magnet unit of length a, and a case body in which all of these are formed, and a flat section of length b is formed in the fluid transfer passage at a position facing the permanent magnet unit at a distance d.

[0004] The flat portion of the case body is formed on the bottom of a concave groove carved downward from the outer surfaces of the inlet and outlet, and a permanent magnet unit is mounted on the bottom of the concave groove. When the fluid is introduced from the inlet into the fluid transfer passageway, magnetic foreign matter contained in the fluid is attracted to and removed by the permanent magnet unit as the fluid flows through the fluid transfer passageway. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-247488 A Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, there are cases where it is desired to adjust the strength of the magnetic field acting on the fluid depending on the properties of the fluid, etc. For example, when the viscosity of the fluid is high, it becomes difficult to attract and remove magnetic foreign matter from the fluid, so it is sometimes desired to strengthen the magnetic field acting on the fluid.

[0007] However, in the foreign matter removal device of Patent Document 1 mentioned above, the permanent magnet unit on the lower case side is fitted into a storage section recessed into the bottom surface of the lower case, and the permanent magnet unit on the upper case side is placed on the outer surface of the flat section of the upper case.

[0008] Therefore, if it was desired to change the strength of the magnetic field acting on the moving body transfer passage, it was necessary, for example, to change the thickness or outer diameter of the permanent magnet unit itself, or to change the thickness or shape of the bottom surface of the lower case or the flat part of the upper case of the case body, and it was not possible to flexibly adjust the strength of the magnetic field acting on the moving body transfer passage according to the properties of the fluid, etc.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a magnetic foreign matter remover that can flexibly adjust the strength of the magnetic field acting on the flow passage in accordance with the properties of the fluid, etc. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the present invention provides a magnetic foreign matter removal device that uses a magnetic field to adsorb and remove magnetic foreign matter from a fluid containing the magnetic foreign matter, the device comprising: a case forming an inlet through which the fluid is introduced, an outlet through which the fluid is discharged, and a flow passage communicating with the inlet and the outlet and through which the fluid flows; and a magnetic member made of a permanent magnet, the case having a pair of flow passage forming walls that form the flow passage arranged to face each other at a predetermined distance apart, the magnetic members being arranged to face magnetic member arrangement spaces provided on the opposite side of the pair of flow passage forming walls from the flow passage, one or both of the magnetic members being provided in the magnetic member arrangement space and held in a predetermined position by an advancing / retracting means that changes the distance from the magnetic member abutment surface with which the magnetic member abuts.

[0011] According to the above invention, one or both of the magnetic members arranged to face each other in a pair of magnetic member arrangement spaces provided in the case are held in a predetermined position by an advancing / retracting means that changes the distance from the magnetic member abutment surface.Therefore, the distance of the magnetic member from the magnetic member abutment surface can be appropriately changed depending on the properties of the fluid containing magnetic foreign matter, and the strength of the magnetic field acting on the fluid can be flexibly adjusted.

[0012] In the magnetic foreign matter removal device of the present invention, a pair of the flow passage forming walls are arranged in the up-down direction of the case, and a pair of the magnetic member arranging spaces are provided in the up-down direction of the case corresponding to the pair of the flow passage forming walls, the flow passage forming wall arranged below the case has an introduction wall arranged on the inlet side, a discharge wall arranged on the discharge outlet side, and an upper wall portion arranged between the introduction wall and the discharge wall and arranged above lower ends of the introduction wall and the discharge wall, the upper wall portion has a bottom wall having a width shorter than an inner dimension of the case, and abutting wall portions abutting against the flow passage forming wall arranged above the case via steps provided on both ends in the width direction of the bottom wall, and the magnetic member arranged in the magnetic member arranging space located above the case is wider than the bottom wall, and it is preferable that the magnetic member arranging space located below the case is provided inside the introduction wall, the discharge wall, the bottom wall, and the abutting wall portions.

[0013] According to the above aspect, the upper wall portion constituting the flow passage forming wall below the case has a bottom wall having a width shorter than the inner dimensions of the case, and an abutment wall portion abutting the flow passage forming wall above the case via steps provided at both ends in the extension direction of the bottom wall, thereby making it possible to narrow the distance between the bottom wall on the lower side of the case and the flow passage forming wall on the upper side of the case opposite the bottom wall.

[0014] In addition, since the magnetic member arranged in the magnetic member arrangement space located above the case is wider than the bottom wall, a strong magnetic field can be applied from the magnetic member to the flow passage which narrows the distance between the bottom wall on the lower side of the case and the flow passage forming wall on the upper side of the case opposite the bottom wall, thereby preventing magnetic foreign matter from being attracted to and leaking from the fluid.

[0015] In the magnetic foreign matter remover of the present invention, it is preferable that a foreign matter capture section for capturing the magnetic foreign matter is disposed at a position downstream of the bottom wall in the flow direction of the fluid in the flow passage.

[0016] According to the above-mentioned aspect, a foreign object capture section for capturing magnetic foreign objects is disposed downstream of the bottom wall in the direction of fluid flow. Therefore, even if a magnetic foreign object captured by the bottom wall detaches from the inner surface of the bottom wall, it can be captured by the foreign object capture section, thereby more reliably preventing the magnetic foreign object from being adsorbed and leaking from the fluid. Effect of the Invention

[0017] According to the present invention, one or both of the magnetic members arranged to face each other in a pair of magnetic member arrangement spaces provided in the case are held in a predetermined position by an advancing / retracting means that changes the distance from the magnetic member abutment surface.Therefore, the distance of the magnetic member from the magnetic member abutment surface can be appropriately changed depending on the properties of the fluid containing magnetic foreign matter, and the strength of the magnetic field acting on the fluid can be flexibly adjusted. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic diagram showing an embodiment of a magnetic foreign matter removal device according to the present invention; [Diagram 2] FIG. 2 is a schematic exploded perspective view of the magnetic foreign matter removal device. [Diagram 3] FIG. 2 is a schematic plan view of the magnetic foreign matter removal device. [Figure 4] 13 is an explanatory diagram of the magnetic foreign matter removal device in which the distance between both magnetic members and the magnetic member abutment surfaces is changed via a movable means. FIG. [Diagram 5] 5 is an explanatory diagram showing a relationship between a bottom wall and a magnet and a yoke of a magnetic member in the magnetic foreign matter removal device. FIG. [Figure 6] 3 is an explanatory diagram showing the layout of a plurality of magnets in the magnetic foreign matter removal device. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] (One embodiment of a magnetic foreign matter removal device) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic foreign matter removal device according to the present invention will now be described with reference to the drawings.

[0020] As shown in FIG. 1, the magnetic foreign matter removal device 10 in this embodiment (hereinafter also referred to simply as "removal device 10") adsorbs and removes magnetic foreign matter from a fluid containing magnetic foreign matter by using a magnetic field, and has an inlet 22a through which the fluid is introduced, an outlet 23a through which the fluid (the fluid from which the magnetic foreign matter has been removed) is discharged, a case 15 forming a flow passage R1 that communicates with the inlet 22a and the outlet 23a and through which the fluid flows, and magnetic members 58, 68 made of permanent magnets.

[0021] The case 15 in this embodiment is composed of a first case 20 and a second case 40 that is detachably assembled to the first case 20. The first case 20 is disposed below the case 20 in the vertical direction, and the second case 40 is disposed above the case 20 in the vertical direction.

[0022] In addition, in the case 15, a pair of flow passage forming walls 25, 43 that form the flow passage R1 are arranged facing each other at a predetermined distance (it can also be said that the flow passage forming walls 25, 43 are arranged facing each other with a predetermined gap between them).

[0023] In this embodiment, a pair of flow passage forming walls 25, 43 are disposed in the up-down direction of the case 20. Here, the flow passage forming wall 25 is provided on the first case 20 side, and the flow passage forming wall 43 is provided on the second case 40 side.

[0024] Referring also to Figure 2, the first case 20 of this embodiment has a peripheral wall 21 having a generally cylindrical shape, and from the lower end of the peripheral wall 21, at locations facing radially, generally cylindrical tubular portions 22, 23 each protrude radially outward.

[0025] The internal space at the tip of the cylindrical portion 22 in the protruding direction forms the inlet 22a, and the internal space at the tip of the cylindrical portion 23 in the protruding direction forms the outlet 23a. In addition, a first flange portion 21a having a substantially annular flange shape protrudes from the upper end portion of the peripheral wall 21.

[0026] Furthermore, as shown in Figures 1 and 2, the flow passage forming wall 25 provided in the first case 20 has an inlet wall 26 arranged on the inlet 22a side, a discharge wall 27 arranged on the discharge outlet 23a side, and an upper wall portion 28 provided between the inlet wall 26 and the discharge wall 27 and arranged above the lower ends of the inlet wall 26 and the discharge wall 27.

[0027] The inlet wall 26 and the outlet wall 27 are disposed opposite the pair of cylindrical portions 22, 23 at a predetermined distance, and are erected at an incline so as to gradually approach each other from below to above. Furthermore, flange walls 29, 30 protrude outward from the lower ends of the inlet wall 26 and the outlet wall 27, and these flange walls 29, 30 close the inner periphery of the lower end of the peripheral wall 21.

[0028] 3, the upper wall portion 28 is formed with a predetermined width along a direction perpendicular to the arrangement direction of the pair of cylindrical portions 22, 23 (which can also be said to be a direction along the fluid flow direction. Hereinafter, this will be referred to as "flow direction X"). The direction along the width of the upper wall portion 28 and the bottom wall 33 constituting the upper wall portion 28, which will be described below, will be referred to as the "width direction Y".

[0029] Furthermore, as shown in Figures 2 and 3, the upper wall portion 28 has a bottom wall 33 extending with a width shorter than the inner dimension of the case 20 (here meaning the inner diameter of the approximately cylindrical peripheral wall 21 of the first case 20), and abutment wall portions 31, 31 that abut from both ends of the bottom wall 33 in the width direction Y, via step portions 32, 32, against a flow passage forming wall 43 arranged above the case 20.

[0030] In addition, the abutment walls 31, 31 constituting the upper wall portion 28 abut against the flow passage forming wall 43 of the second case 40 (in this embodiment, they indirectly abut against the flow passage forming wall 43 via the third flange portion 71a of the capture member forming portion 70), thereby forming a space surrounded by the bottom wall 33, the pair of step portions 32, 32, and the flow passage forming wall 43 of the second case 40, and this space becomes the portion of the flow passage R1 that passes through the upper wall portion 28 (constitutes part of the flow passage R1).

[0031] In addition, the width (length along the width direction Y) of the bottom wall 33 is narrower (shorter) than the flow-passage forming wall 43 on the second case 40 side and the magnetic member 68 arranged on the side of the flow-passage forming wall 43. Furthermore, as shown in Fig. 2, the width of the bottom wall 33 is also narrower than the length of the magnetic member 58 arranged on the first case 20 side.

[0032] Furthermore, as shown in Figure 1, a magnetic member arrangement space R2 in which a magnetic member 58 is arranged is formed, located below the case 20 and on the opposite side to the flow passage R1, inside the inlet wall 26, the outlet wall 27, and the upper wall portion 28 (old paragraph 0030).

[0033] The width of the bottom wall 33 is narrower than the width of the flow passage R1 on the upstream side (the flow passage on the inlet 22a side) and the width of the flow passage R1 on the downstream side (the flow passage on the outlet 23a side). In this way, by narrowing the width of the flow passage R1 in the upper wall portion 28, i.e., the width of the adsorption section for adsorbing magnetic foreign matter, a strong magnetic field is applied to the flow passage R1 from the magnetic members 58, 68.

[0034] The magnetic member arrangement space R2 is further provided with a magnetic member abutment surface 28a against which the magnetic member 58 abuts. In this embodiment, the outer surface (which can be called the lower surface) of the upper wall portion 28 constituting the flow passage forming wall 25, which is opposite to the surface (which can be called the inner surface or upper surface) facing the flow passage R1 including the bottom wall 33 and the step portions 32, 32, forms the magnetic member abutment surface 28a against which the magnetic member 58 abuts. The magnetic member 58 abuts against, approaches, or moves away from the magnetic member abutment surface 28a via the advancing and retreating means (this will be described later).

[0035] On the other hand, the second case 40 has a substantially cylindrical peripheral wall 41 having an outer diameter that fits the peripheral wall 21 of the first case 20, and a substantially disk-shaped flow passage forming wall 43 disposed so as to close the lower end opening of the peripheral wall 41. A second flange portion 41a having a substantially annular flange shape projects from the lower end of the peripheral wall 41.

[0036] As shown in FIG. 1, a magnetic member arrangement space R3 is formed between the peripheral wall 41 and the flow passage forming wall 43, located above the case 20 and on the opposite side to the flow passage R1, in which a magnetic member 68 is arranged.

[0037] The magnetic member arrangement space R3 is further provided with a magnetic member abutment surface 43a against which the magnetic member 68 abuts. In this embodiment, the outer surface (which can be called the upper surface) opposite to the surface (which can be called the inner surface or lower surface) of the flow passage forming wall 43 facing the flow passage R1 forms the magnetic member abutment surface 43a against which the magnetic member 68 abuts. The magnetic member 68 abuts against, approaches, or moves away from the magnetic member abutment surface 43a via the advancing and retreating means (this will be described later).

[0038] The magnetic members 58, 68 can be moved toward and away from the magnetic member abutment surfaces 28a, 43a by magnetic member advancing and retracting operation units 50, 60 as shown in FIG.

[0039] In the removal device 10 of this embodiment, the magnetic members 58, 68 are arranged to face the magnetic member arranging spaces R2, R3 provided on the opposite side of the flow passage R1 of the pair of flow passage forming walls 25, 43. Here, the magnetic member 58 is arranged in the magnetic member arranging space R2 of the first case 20, and the magnetic member 68 is arranged in the magnetic member arranging space R3 of the second case 40.

[0040] 2, the magnetic member 58 in this embodiment will be described as a generally rectangular block extending in a specific direction and having a specific thickness, for convenience's sake. Similarly, the magnetic member 68 in this embodiment will be described as a generally disk-like member having a circular periphery and a specific thickness, for convenience's sake.

[0041] Also, as shown in Figures 1 and 4, both of the pair of magnetic members 58, 68 are configured to be held in a predetermined position by an advancing / retracting means that changes the distance from the magnetic member abutment surfaces 28a, 43a (it can also be said that they are configured to move forward and backward so as to change the distance from the magnetic member abutment surfaces 28a, 43a via the advancing / retracting means).

[0042] The magnetic member advancing / retreating operation unit 50 has a base portion 51 , a shaft portion 54 , a shaft support portion 53 that supports the shaft portion 54 , and a biasing spring 57 that biases the magnetic member 58 .

[0043] The base 51 abuts against the flange walls 29, 30 of the flow passage forming wall 25 of the first case 20, and has a shaft support hole 51a formed in the center thereof. The shaft 54 ​​extends a predetermined length, is inserted into the shaft support hole 51a, and is movable back and forth in the vertical direction. A magnetic member 58 is fixed to the tip 54a (upper end) of the shaft 54 ​​in the extending direction.

[0044] Moreover, the shaft support portion 53 is disposed on the lower surface side of the shaft support hole 51a of the base portion 51, and supports a base end portion 54b in the extending direction of the shaft portion 54. Furthermore, the biasing spring 57 is disposed between the base portion 51 and the magnetic member 58, and both ends thereof are supported by a pair of upper and lower spring support portions 57a, 57a, so as to constantly bias the magnetic member 58 upward, i.e., toward the magnetic member abutment surface 28a.

[0045] The biasing spring 57 is disposed so that its axis is generally coaxial with the shaft portion 54. The biasing spring 57 serves to suppress tilting of the magnetic member 58 and to maintain the upper surface of the magnetic member 58 in the thickness direction parallel to the magnetic member abutment surface 28a.

[0046] The shaft portion 54 is a threaded shaft having a male screw formed on its outer periphery. The shaft portion 54 is screwed into a female screw formed on the inner periphery of the shaft support portion 53. The base end portion 54b (lower end portion) of the shaft portion 54 in the extending direction is rotated in a predetermined direction using a handle, tool, or the like (not shown), so that the tip portion 54a of the shaft portion 54 moves up and down (it can also be said that it moves in the axial direction in the ascending and descending direction). That is, the shaft portion 54 and the shaft support portion 53 have a so-called ball screw structure.

[0047] Then, when the base end 54b of the shaft 54 ​​is rotated in a predetermined direction from the state shown in FIG. 1, i.e., from the state where the upper surface of the magnetic member 58 is in contact with the magnetic member abutment surface 28a, the tip end 54a of the shaft 54 ​​retracts downward a predetermined distance (moves axially downward a predetermined length) against the biasing force of the multiple biasing springs 57, as shown in FIG. 4, and the magnetic member 58 moves away from the magnetic member abutment surface 28a by a predetermined distance.

[0048] On the other hand, when the base end 54b of the shaft 54 ​​is rotated in the opposite direction to that when the shaft is lowered from the state shown in Figure 4, i.e., the state in which the upper surface of the magnetic member 58 is separated from the magnetic member abutment surface 28a, the tip end 54a of the shaft 54 ​​moves upward a predetermined distance (moves axially a predetermined length in the upward direction), and the magnetic member 58 approaches or abuts against the magnetic member abutment surface 28a.

[0049] Further, the magnetic member advance / retreat operation unit 60 has a base portion 61 , a shaft portion 64 , a shaft support portion 63 that supports the shaft portion 64 , and a biasing spring 67 that biases the magnetic member 68 .

[0050] The base 61 abuts against the upper end of the peripheral wall 41 of the second case 40, and has a shaft support hole 61a formed in the center. The shaft 64 extends a predetermined length, is inserted into the shaft support hole 61a, and is movable back and forth in the vertical direction. A magnetic member 68 is fixed to the tip 64a (lower end) of the shaft 64 in the extending direction.

[0051] Moreover, the shaft support portion 63 is disposed on the upper surface side of the shaft support hole 61a of the base portion 61, and supports a base end portion 64b in the extending direction of the shaft portion 64. Furthermore, the biasing spring 67 is disposed between the base portion 61 and the magnetic member 68, and both ends thereof are supported by the spring support portion 67a, so as to constantly bias the magnetic member 68 downward, i.e., toward the magnetic member abutment surface 43a.

[0052] The biasing spring 67 is disposed so that its axis is generally coaxial with the shaft portion 64. The biasing spring 67 serves to suppress tilting of the magnetic member 68 and to maintain the lower surface of the magnetic member 68 in the thickness direction parallel to the magnetic member abutment surface 43a.

[0053] Similarly to the shaft portion 54, the shaft portion 64 is a threaded shaft having a male screw formed on its outer periphery. The shaft portion 64 is screwed into a female screw formed on the inner periphery of the shaft support portion 63. By rotating a base end portion 64b (upper end portion) of the shaft portion 64 in the extending direction in a predetermined direction, a tip portion 64a of the shaft portion 64 moves forward and backward in the vertical direction. That is, the shaft portion 64 and the shaft support portion 63 have a so-called ball screw structure.

[0054] Then, when the base end 64b of the shaft 64 is rotated in a predetermined direction from the state shown in FIG. 1, i.e., from the state where the lower surface of the magnetic member 68 is in contact with the magnetic member abutment surface 43a, the tip end 64a of the shaft 64 moves upward a predetermined distance (moves axially in the upward direction a predetermined length) against the biasing force of the biasing spring 67, as shown in FIG. 4, and the magnetic member 68 moves away from the magnetic member abutment surface 43a by a predetermined distance.

[0055] On the other hand, when the base end 54b of the shaft 64 is rotated in the opposite direction to when the shaft is raised from the state shown in Figure 4, i.e., the state in which the lower surface of the magnetic member 68 is separated from the magnetic member abutment surface 43a, the tip end 64a of the shaft 64 advances downward a predetermined distance (moves axially in the downward direction for a predetermined length), and the magnetic member 68 approaches or abuts against the magnetic member abutment surface 43a.

[0056] In this embodiment, the shaft support portion 53 and the shaft portion 54 in the first case 20 and the shaft support portion 63 and the shaft portion 64 in the second case 40, which have a so-called ball screw structure, form the "advancing and retreating means" in the present invention.

[0057] Furthermore, as shown in FIG. 1, when the upper surface of the magnetic member 58 is in contact with the magnetic member abutment surface 28a and the lower surface of the magnetic member 68 is in contact with the magnetic member abutment surface 43a, a strong magnetic field action region A is created between the bottom wall 33 on the lower side of the case and the flow passage forming wall 43 on the upper side of the case at a position opposite to the bottom wall 33, where a strong magnetic field acts from the magnetic members 58, 68.

[0058] 2, a foreign matter capture section 75 that captures magnetic foreign matter is disposed downstream in the fluid flow direction of the flow passage R1 from the bottom wall 33. For convenience, the foreign matter capture section 75 is omitted from FIG.

[0059] In this embodiment, the foreign object capture portion 75 is arranged downstream of the bottom wall 33 by the capture member forming portion 70, which is arranged between the first case 20 and the second case 40, as shown in FIG.

[0060] In addition, the capture member forming portion 70 has an annular body 71 having a substantially circular ring shape, a third flange portion 71a having an annular flange shape extending from the upper end portion of the annular body 71, an extending wall 72 having a substantially arc-like shape extending from the radial discharge outlet 23a side of the annular body 71 toward the axial downward direction of the annular body 71, and a substantially crescent-shaped bottom portion 73 extending from the tip (lower end) of the extending wall 72 in the extending direction, and the extending wall 72 and the bottom portion 73 constitute the foreign matter capture portion 75.

[0061] Furthermore, notches 71b, 71b into which the abutment walls 31, 31 of the upper wall 28 fit are formed in radially opposing locations of the annular body 71.

[0062] Then, as shown in Figures 1 and 4, with the foreign object capture portion 75 of the capture member forming portion 70 aligned on the downstream side of the bottom wall 33, the third flange portion 71a of the capture member forming portion 70 is sandwiched between the first flange portion 21a of the first case 20 and the second flange portion 41a of the second case 40, whereby the capture member forming portion 70 is sandwiched and fixed between the pair of cases 20, 40, and the foreign object capture portion 75 is positioned on the downstream side of the bottom wall 33.

[0063] At this time, the abutment walls 31, 31 of the upper wall portion 28 enter the notches 71b, 71b of the annular body 71 and abut against the back surface of the third flange portion 71a, so that the abutment walls 31, 31 indirectly abut against the flow passage forming wall 43 of the second case 40 via the third flange portion 71a.

[0064] The pair of cases 20, 40 are fixed to each other by clamps, fasteners, etc. (not shown) so that the ends of the peripheral walls 21, 41 are not separated from each other.

[0065] Also, as shown in FIG. 5, in this embodiment, the magnetic members 58, 68 are composed of a plurality of magnets 80 arranged in a predetermined layout, with adjacent magnets 80 arranged with the same poles facing each other via a yoke 85.

[0066] 1, 3 and 4, for convenience, the magnets 80 are omitted, and the magnets are illustrated as single magnetic members 58 and 68. Furthermore, in Fig. 5, for convenience, the capture member forming portion 70 is omitted. This also applies to the modified examples shown in Figs. 7 to 12 described later.

[0067] More specifically, in this embodiment, each magnet 80 is a permanent magnet having a substantially rectangular columnar shape (solid rectangular bar shape) that has a predetermined width and a predetermined length. One end side in the width direction of the magnet 80 forms an N pole 81, and the other end side in the width direction forms an S pole 82. Also, in this embodiment, the yoke 85 is a plate-like body made of a metal such as pure iron or low carbon steel.

[0068] As shown in FIG. 5, each magnet 80 is arranged such that the north poles 81, 81 of adjacent magnets 80, 80 face each other with a yoke 85 interposed between the north poles 81, 81, or the south poles 82, 82 of adjacent magnets 80, 80 face each other with a yoke 85 interposed between the south poles 82, 82.

[0069] Furthermore, by disposing the yoke 85 between adjacent magnets 80, 80 with the same poles, the magnetic force of the magnets 80 acts on the yoke 85, and the yoke 85 becomes an attraction portion for magnetic foreign matter.

[0070] Note that Figure 6 shows the layout of magnets 80 on the second case 40 side. The multiple magnets 80, which are roughly rectangular prism-shaped, extend across the peripheral wall 41 of the second case 40, and multiple magnets of different lengths are provided. These multiple magnets 80 are arranged within the peripheral wall 41 of the second case 40, which is roughly cylindrical, in a layout that minimizes wasted space.

[0071] Fig. 5 shows the relationship between the bottom wall 33 and the magnets 80 and yoke 85 of the magnetic members 58 and 68 in this embodiment. As shown in Fig. 5, the yoke 85 arranged between the magnets 80, 80 that constitute the magnetic member 58 and the yoke 85 arranged between the magnets 80, 80 that constitute the magnetic member 68 are aligned in the width direction Y of the bottom wall 33.

[0072] In addition, the north pole 81 of the magnet 80 on the magnetic member 58 side and the south pole 82 of the magnet 80 on the magnetic member 68 side are arranged in positions that align in the width direction Y of the bottom wall 33, and further, the south pole 82 of the magnet 80 on the magnetic member 58 side and the north pole 81 of the magnet 80 on the magnetic member 68 side are arranged in positions that align in the width direction Y of the bottom wall 33 (see Figure 5).

[0073] (Modification of magnetic foreign matter removal device) The structure and shape of the magnetic foreign matter remover of the present invention, and the shapes and structures of the casing and magnetic members that constitute the magnetic foreign matter remover are not limited to the above-mentioned embodiments.

[0074] Although the case 15 in this embodiment is made up of two parts, a first case 20 and a second case 40, the case may be a single part. The peripheral wall of the case may be in the shape of a substantially rectangular cylinder or a substantially elliptical cylinder. Furthermore, the flow passage forming wall of the second case may have the same shape as the flow passage forming wall of the first case.

[0075] Furthermore, in this embodiment, both the magnetic member 58 on the first case 20 side and the magnetic member 68 on the second case 40 side are moved forward and backward via an advancing / retracting means and held in a predetermined position, but it is also possible to move either one of the magnetic members forward and backward via an advancing / retracting means so that the distance from the magnetic member abutment surface can be changed and held in a predetermined position.

[0076] In addition, in this embodiment, the pair of flow passage forming walls 25, 43 are arranged in the upward direction of the case 15, but the pair of flow passage forming walls may be arranged, for example, in the left-right direction or diagonally of the case, and are not particularly limited.

[0077] Furthermore, in this embodiment, the shaft support portions 53, 63 and shaft portions 54, 64 having a so-called ball screw structure form the "advancing / retreating means" of the present invention, but the advancing / retreating means may also be, for example, an electric actuator, a hydraulic cylinder, an air cylinder, etc., and may be configured to move the magnetic member so as to abut against, approach, or move away from the magnetic member abutment surface, thereby changing the distance from the magnetic member abutment surface.

[0078] Furthermore, if magnetic foreign matter contained in the fluid has solidified or aggregated, a well-known so-called disintegrator may be disposed further upstream of the inlet 22a in order to disintegrate or disperse the solidified or aggregated magnetic foreign matter.

[0079] (Effects of magnetic foreign matter removal device) Next, a method of using the removal device 10 having the above structure and its functions and effects will be described.

[0080] 1 shows a state in which the first case 20 and the second case 40 of the case 15 are assembled, and the magnetic member 58 is in contact with the magnetic member abutment surface 28a, and the magnetic member 68 is in contact with the magnetic member abutment surface 43a via the movable means. In this case, the distance between the magnetic members 58, 68 and the magnetic member abutment surfaces 28a, 43a is 0 (in contact / in contact), so that the magnetic field from the magnetic members 58, 68 acts on the magnetic member abutment surfaces 28a, 43a in the strongest state.

[0081] In this state, when a fluid containing magnetic foreign matter is introduced into flow passage R1 from inlet 22a of case 15, it flows through flow passage R1 on the inlet 22a side, and then flows into bottom wall 33. Note that arrows F in Figures 1 to 4 indicate the flow path of the fluid.

[0082] Then, the fluid flows into the flow passage R1 formed in the upper wall portion 28, and passes through a strong magnetic field action region A (see FIGS. 1 and 5) partitioned by the bottom wall 33 and the flow passage forming wall 43 located opposite to the bottom wall 33. That is, as a result of the strong magnetic field from the magnetic members 58, 68 acting on the fluid passing through the strong magnetic field action region A located on the surface opposite to the magnetic member abutting surfaces 28a, 43a, magnetic foreign matter contained in the fluid is adsorbed and removed.

[0083] The fluid that has passed through bottom wall 33 passes through downstream flow passage R1 on the bottom wall 33 side, i.e., flow passage R1 on the discharge port 23a side, and is then discharged from discharge port 23a to a downstream line (not shown).

[0084] In this removal device 10, as shown in Figures 1 and 4, both of the magnetic members 58, 68 arranged on the magnetic member abutment surfaces 28a, 43a of a pair of flow passage forming walls 25, 43 arranged in the case 15 are configured to be held in a predetermined position by an advancing / retracting means that changes the distance from the magnetic member abutment surfaces 28a, 43a.

[0085] As a result, the distance of the magnetic members 58, 68 from the magnetic member abutment surfaces 28a, 43a of the flow passage forming walls 25, 43 can be appropriately changed depending on the properties of the fluid containing magnetic foreign matter, and the strength of the magnetic field acting on the fluid can be flexibly adjusted. This makes it possible to appropriately select the magnetic field acting on the fluid depending on the properties of the fluid, and therefore to effectively adsorb and remove the magnetic foreign matter from the fluid.

[0086] In addition, it may be necessary to remove both cases 20, 40 when assembling the two cases 20, 40 (this can also be considered setup time), or when removing magnetic foreign matter adhering to the inner surface of the flow passage R1, removing magnetic foreign matter from the foreign matter capture section 75, or performing maintenance.

[0087] In the above cases, the magnetic member 58 on the first case 20 side is moved away from the magnetic member abutment surface 28a, the magnetic member 68 on the second case 40 side is moved away from the magnetic member abutment surface 43a, or both of the magnetic members 58, 68 are moved away from the magnetic member abutment surfaces 28a, 58a. As a result, the magnetic field and surface magnetic flux density from the magnetic members 58, 68 can be weakened, making it easy to attach and detach one case to the other.

[0088] Also, as shown in Figures 2 and 3, in this embodiment, the upper wall portion 28 constituting the flow passage forming wall 25 below the case has a bottom wall 33 having a width shorter than the inner dimension of the case 20, and abutment wall portions 31, 31 that abut against the flow passage forming wall 43 above the case via step portions 32, 32 provided on both ends of the bottom wall 33 in the width direction Y.

[0089] This makes it possible to narrow the distance between the bottom wall 33 on the lower side of the case and the flow-path forming wall 43 on the upper side of the case opposing the bottom wall 33. In addition, the magnetic member 68 arranged in the magnetic member arrangement space R3 located above the case 20 is wider than the bottom wall 33, so that a strong magnetic field from the magnetic member 68 can be applied to the flow path R1 which narrows the distance between the bottom wall 33 on the lower side of the case and the flow-path forming wall 43 on the upper side of the case opposing the bottom wall 33, thereby making it possible to prevent magnetic foreign matter from being attracted to and leaking from the fluid.

[0090] Furthermore, as shown in FIG. 2, in this embodiment, a foreign matter capture portion 75 for capturing magnetic foreign matter is disposed at a position downstream of the bottom wall 33 in the flow direction of the fluid in the flow passage R1.

[0091] According to the above-mentioned embodiment, even if the magnetic foreign matter captured by the bottom wall 33 detaches from the inner surface of the bottom wall 33, it can be captured by the foreign matter capture section 75, thereby more reliably preventing the magnetic foreign matter from being adsorbed and leaking from the fluid.

[0092] It should be noted that the present invention is not limited to the above-described embodiment, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. [Explanation of symbols]

[0093] 10 Magnetic foreign matter removal device (removal device) 15 cases 20 Case 1 22a Introduction 23a Outlet 25 Flow path forming wall 26 Introduction wall 27 Discharge wall 28 Upper wall 28a Magnetic member contact surface 31,31 Abutting wall part 32,32 Stepped section 33 Bottom Wall 40 Case 2 43 Flow path forming wall 43a Magnetic member contact surface 50,60 Magnetic member advance / retract movement unit 53,63 Shaft support part 54,64 Shaft 58,68 Magnetic members 70 Capturing member forming section 75 Foreign object capture section 80 Magnet 81 N pole 82 S pole 85 York R1 Distribution path

Claims

1. A magnetic foreign matter removal device that adsorbs and removes magnetic foreign matter from a fluid containing the magnetic foreign matter by using a magnetic field, a case having an inlet through which the fluid is introduced, an outlet through which the fluid is discharged, and a flow passage communicating with the inlet and the outlet and through which the fluid flows; The magnetic member is a permanent magnet. A pair of flow passage forming walls that form the flow passage are disposed in the case so as to face each other at a predetermined distance, the magnetic members are disposed so as to face magnetic member disposition spaces provided on the opposite sides of the flow passage of the pair of flow passage forming walls, A magnetic foreign matter removal device characterized in that one or both of the magnetic members are arranged in the magnetic member arrangement space and are held in a predetermined position by an advance / retract means that changes the distance from the magnetic member abutment surface with which the magnetic member abuts.

2. a pair of the flow passage forming walls are disposed in a vertical direction of the case, and a pair of the magnetic member arrangement spaces are provided in the vertical direction of the case in correspondence with the pair of the flow passage forming walls, the flow passage forming wall disposed below the case includes an introduction wall disposed on the introduction port side, a discharge wall disposed on the discharge port side, and an upper wall portion provided between the introduction wall and the discharge wall and disposed above lower ends of the introduction wall and the discharge wall, the upper wall portion has a bottom wall having a width shorter than an inner dimension of the case, and abutting wall portions that abut against the flow passage forming wall disposed above the case via steps provided at both ends of the bottom wall in a width direction, The magnetic member disposed in the magnetic member disposition space located in the upper portion of the case is wider than the bottom wall, 2. The magnetic foreign matter remover according to claim 1, wherein the magnetic member arrangement space is defined below the case and is inside the introduction wall, the discharge wall, the bottom wall and the contact wall.

3. 3. The magnetic foreign matter remover according to claim 2, wherein a foreign matter capture section for capturing the magnetic foreign matter is disposed downstream of the bottom wall in the flow direction of the fluid in the flow passage.

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