Magnetic material removal device

Abstract

The present invention provides a magnetic material removal device that allows for easy maintenance work and can easily and efficiently remove magnetically attracted magnetic materials. [Solution] A magnetic adsorption part 11 is provided inside the main body 1, and an outer casing 21 is provided that encloses the magnetic adsorption part 11 and is movable along the surface of the magnetic adsorption part 11. One end of the outer casing 21 is provided with a flange 22 that is wider than the outer diameter of the outer casing 21, and a return part 23 that is bent toward the other end of the outer casing 21 is provided on the outer circumference of the flange 22. During maintenance work, the gripping part 26 is pulled to move the outer casing 21. Magnetic material 8 that is magnetically adsorbed to the surface of the outer casing 21 is scraped off by the flange 22 and return part 23 as the outer casing 21 moves and falls into the foreign matter storage chamber 5, and is finally discharged from the foreign matter discharge port 6.

Description

Technical Field

[0001] The present invention relates to a magnetic substance removing device for removing magnetic substances from a fluid by magnetic force.

Background Art

[0002] For the purpose of collecting dust generated in pipes of fluids such as water, oil, air, gas, etc. and rust peeled off from the inner surface of the pipe, foreign substance removing devices called, for example, strainers are adopted in most pipes. In a general foreign substance removing device, a net-like filter is provided inside, and foreign substances in the fluid are filtered and removed by this net-like filter.

[0003] On the other hand, a magnetic substance removing device provided with a magnet inside is also used for the purpose of collecting rust inside the pipe or removing magnetic substances in the fluid. There is also a magnetic substance removing device that incorporates the net-like filter used in the above-mentioned foreign substance removing device and filters foreign substances while removing magnetic substances.

[0004] FIG. 5 is a cross-sectional view showing an example of a conventional magnetic substance removing device. In the figure, 1 is the main body, 2 is the inlet, 3 is the outlet, 4 is the foreign substance removal chamber, 41 is the filter section, 42 is the magnet, and 43 is the cap. The fluid supplied from the inlet 2 flows into the foreign substance removal chamber 4. A magnet 42 is provided in the foreign substance removal chamber 4, and magnetic substances present in the fluid are magnetically adsorbed and removed on the surface of the magnet 42 by the magnetic force of the magnet 42. In this example, a filter section 41 is provided around the magnet 42, and the fluid flowing into the foreign substance removal chamber 4 is configured to pass through this filter section 41 and head toward the outlet 3. Foreign substances are filtered and removed when the fluid passes through the filter section 41.

[0005] When using such a magnetic material removal device, removed magnetic material accumulates on the surface of the magnet 42. As the amount of magnetic material attracted by magnetic force increases, the magnetic force acting on newly arriving magnetic material decreases, making it impossible to adequately magnetically attract the magnetic material, or magnetic material that has been magnetically attracted may detach and re-contaminate the material, causing problems. In addition, foreign matter accumulates in the filter section 41, causing clogging, which can reduce the fluid flow rate, or even cause the system to stop, putting pressure on the upstream piping and potentially damaging it, leading to malfunctions and accidents. Therefore, it is necessary to clean and remove the magnetic material accumulated on the surface of the magnet 42 and the foreign matter accumulated in the filter section 41 at appropriate times.

[0006] In the configuration shown in Figure 5, after stopping the fluid inflow, the cap 43 is removed to take out the magnet 42 and filter section 41 for cleaning. The cap 43 is either screw-on or bolted on, but it is firmly attached to the main body 1 to prevent the fluid from leaking out during operation, and its removal requires tools such as a wrench, making it a very time-consuming task. Furthermore, it is not possible to check how much foreign matter or magnetic material has accumulated without removing it, but due to the difficulty of the removal process, this is often neglected and left unattended, resulting in maintenance that does not allow the system to perform at its best.

[0007] The conventional configuration shown in Figure 5 above is also described in, for example, Patent Document 1. Although Patent Document 1 further includes a cover to enclose the magnet, it is still not possible to check the degree of magnetic material adhesion or clean the magnet without removing the cap 43 and taking out the magnet, which still requires time-consuming work.

[0008] One example of a magnetic material removal device with a structure that allows for easy cleaning is described in Patent Document 2. In the configuration described in Patent Document 2, a magnet is inserted into an outer casing called a drywell, and magnetic materials are attracted to the outer surface of the casing. During maintenance work, by slowly pulling the magnet out of the casing, the magnetic materials attracted to the surface of the casing also move downward along with the movement of the magnetic force. When the magnet is pulled out, the magnetic force that attracted the magnetic materials is lost, so the magnetic materials separate from the surface of the casing and accumulate at the bottom of the foreign material removal chamber. The magnetic materials accumulated at the bottom are discharged from an outlet provided at the bottom of the foreign material removal chamber.

[0009] However, in the case of magnetic particles, they tend to remain on the surface of the casing even when the magnet is moved. This is because the roughness of the casing surface creates resistance to the movement of the particles, and the magnetic force acting on them is also small. In particular, with tar-like magnetic materials, they remain on the surface of the casing even when the magnet is moved, and in cases where a large amount is attracted, we have observed in the past that they slowly drip downwards over time after the magnet is removed.

[0010] Furthermore, when performing maintenance work including the filter section, the fluid in the foreign matter removal chamber is discharged to the outside, thereby removing foreign matter along with the fluid. At that time, magnetic matter remaining on the surface of the outer casing is also washed away by the fluid, but magnetic matter remaining near the tip of the outer casing may adhere to the filter section due to sedimentation by its own weight and remain even after the fluid has been discharged. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Japanese Patent Publication No. 2010-279887 [Patent Document 2] Japanese Patent Publication No. 2020-121301 [Overview of the project] [Problems that the invention aims to solve]

[0012] The present invention has been made in view of the above circumstances, and aims to provide a magnetic material removal device that can easily perform maintenance work and can easily and efficiently remove magnetically adsorbed magnetic materials down to fine particles. [Means for solving the problem]

[0013] The invention described in claim 1 of this application is a magnetic material removal device for removing magnetic materials contained in a fluid by magnetic adsorption, characterized in that it comprises a magnetic adsorption means having magnetic force, an outer casing means enclosing the magnetic adsorption means and causing magnetic materials to be magnetically adsorbed to its outer surface by the magnetic force of the magnetic adsorption means, a flange portion provided at one end of the outer casing means that is wider than the outer diameter of the outer casing means, and a moving means provided at the other end of the outer casing means that moves the outer casing means along the extending direction of the magnetic adsorption means.

[0014] The invention described in claim 2 of this application is a magnetic material removal device characterized in that the outer circumference of the flange portion in the invention described in claim 1 of this application is provided with a return portion that is bent toward the other end of the exterior means.

[0015] The invention described in claim 3 of this application is a magnetic material removal device characterized by further comprising a filtration means for removing foreign matter from a fluid, in addition to the configuration of the invention described in claim 1 or claim 2 of this application. [Effects of the Invention]

[0016] According to the present invention, by moving the exterior means relative to the magnetic adsorption means by the moving means, for magnetic substances moving on the surface of the exterior means by magnetic force, they abut against the flange portion and are pushed outwards, the magnetic adsorption force decreases and they fall off. For magnetic substances remaining on the surface as the exterior means moves, they simply move away from the magnetic force of the magnetic adsorption means. Thus, any magnetic substances can be easily and efficiently removed. Also, such maintenance work only requires moving the exterior means by the moving means, eliminating the need for cumbersome operations such as removing the cap member using tools as in the prior art, and the maintenance work can be easily performed. Furthermore, even when performing maintenance work by discharging the internal fluid in a configuration having a filtering means, after moving the exterior means by the moving means, no magnetic substances will adhere to or remain on the filter portion during fluid discharge, and the maintenance work can be easily performed.

[0017] Also, if a return portion is provided on the outer peripheral portion of the flange portion, magnetic substances reaching the flange portion can be efficiently scraped off. Note that the present invention can be applied to both configurations having a filtering means and configurations not having a filtering means.

Brief Description of the Drawings

[0018] [Figure 1] It is a cross-sectional view showing an embodiment of the present invention. [Figure 2] It is a schematic view of an example of the magnetic adsorption portion and the exterior body in an embodiment of the present invention. [Figure 3] It is an explanatory view of an example of the operation in an embodiment of the present invention. [Figure 4] It is a partially enlarged view of an example of the operation in an embodiment of the present invention. [Figure 5] It is a cross-sectional view showing an example of a conventional magnetic substance removing device.

Modes for Carrying Out the Invention

[0019] FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a schematic view of an example of the magnetic adsorption part and the exterior body. In the figures, 1 is the main body, 2 is the inlet, 3 is the outlet, 4 is the foreign matter removal chamber, 5 is the foreign matter storage chamber, 6 is the foreign matter discharge port, 7 is the packing member, 8 is the magnetic material, 11 is the magnetic adsorption part, 12 is the base part, 13 is the slit part, 14 is the magnet, 21 is the exterior body, 22 is the flange part, 23 is the return part, 24 is the rod-shaped part, 25 is the protrusion, 26 is the gripping part, and 31 is the filtering part.

[0020] In this example, an inlet 2 is provided on the left side of the main body 1 in the figure, an outlet 3 is provided on the right side in the figure, a foreign matter removal chamber 4 is provided in the central part, and a foreign matter storage chamber 5 is provided diagonally downward to the right of the foreign matter removal chamber 4 in the figure. Fluid is supplied from the inlet 2, and the supplied fluid is in the foreign matter removal chamber 4, the magnetic material 8 is removed by the magnetic adsorption part 4, and after other foreign matters are removed by the filtering part 31, the fluid is discharged from the outlet 3. A foreign matter discharge port 6 is provided at the lower part of the foreign matter storage chamber 5, and foreign matters including the removed magnetic material 8 can be discharged to the outside.

[0021] Inside the main body 1, a magnetic adsorption part 11, an exterior body 21, and a filtering part 31 are provided. The magnetic adsorption part 11 houses a plurality of magnets 14 inside, and due to these magnets 14, the magnetic adsorption part 11 has a magnetic force. Each magnet 14 housed in the magnetic adsorption part 11 is loaded so that the same poles face each other. The magnetic flux density is the largest at the part where the same poles face each other, and more magnetic materials 8 will be adsorbed. As will be described later, the magnetic adsorption part 11 is covered by the exterior body 21 during use, and the magnetic material 8 will be adsorbed on the surface of the exterior body 21. However, as shown in the figure, a large amount of magnetic materials 11 will be adsorbed and removed like a ring at the part where the same poles of the magnet 14 face each other.

[0022] The magnetic adsorption part 11 is substantially rod-shaped, but the cross-sectional shape is not limited to circular and may be various shapes. However, as will be described later, since the exterior body 21 moves on the outer surface of the magnetic adsorption part 11, it is desirable that the cross-sectional shape is uniform within the movement range of the exterior body 21.

[0023] As shown in Figure 2(A), a base portion 12 is provided at the bottom of the magnetic adsorption portion 11, and the lower part of the base portion 12 is fixed to the bottom of the foreign matter storage chamber 5. The upper magnetic adsorption portion 11 is mainly located in the foreign matter removal chamber 4, and the lower base portion 12 is mainly located in the foreign matter storage chamber 5. A slit portion 13 is provided on the side of the base portion 12. This slit portion 13 serves as a guide when moving the outer casing 21, which will be described later.

[0024] The outer casing 21 encloses the magnetic adsorption part 11 and is configured to move along the surface of the magnetic adsorption part 11. Therefore, its cross-sectional shape is in line with the cross-sectional shape of the magnetic adsorption part 11. The outer casing 21 is a magnetic material, and the magnetic force of the magnetic adsorption part 11 magnetically attracts magnetic material 8 to its outer surface.

[0025] One end of the outer casing 21 is provided with a flange portion 22 that is wider than the outer diameter of the outer casing 21, and the outer circumference of the flange portion 22 is provided with a return portion 23 that is bent toward the other end of the outer casing 21. The flange portion 22 and the return portion 23 have the function of scraping off magnetic material 8 that is magnetically attached to the surface when the outer casing 21 is pulled down during cleaning. Details will be described later along with the operation.

[0026] As shown in Figure 2(B), the other end of the outer casing 21 is provided with a rod-shaped portion 24 and a gripping portion 26 as means for moving the outer casing 21 relative to the magnetic adsorption portion 11 along its extending direction. The rod-shaped portion 24 protrudes from the bottom of the foreign matter storage chamber 5, and the gripping portion 26 is provided at the outer end of the rod-shaped portion 24 that protrudes from the foreign matter storage chamber 5. A packing member 7 is provided at the portion where the rod-shaped portion 24 penetrates the foreign matter storage chamber 5 to prevent leakage of the internal fluid. To prevent water leakage at the through-hole portion of the rod-shaped portion 24, a simple cross-sectional shape such as a circle is preferable. Alternatively, a known water leakage prevention mechanism other than the packing member 7 may be applied.

[0027] Furthermore, a projection 25 is provided near the other end of the outer casing 21. This projection 25 engages with a slit 13 provided on the base 12, and the projection 25 moves along the shape of the slit 13, allowing the outer casing 21 to move up and down. In this example, the slit 13 is provided on the base 12 and the projection 25 is provided on the outer casing 21 to restrict the movement of the outer casing 21, but it goes without saying that the mechanism for restricting the movement of the outer casing 21, or the configuration for moving the outer casing 21, could be any other configuration.

[0028] The filtration section 31 is made of, for example, a mesh material and removes foreign matter from the fluid. This filtration section 31 is positioned to surround the magnetic adsorption section 11, and the fluid flowing in from the inlet 2 is supplied to the space surrounded by the filtration section 31. The fluid then passes through the filtration section 31 to the space outside the filtration section 31, where it is removed. The fluid that has passed outside the filtration section 31 is discharged from the outlet 3. In this way, the filtration section 31 is positioned so that the fluid flowing in from the inlet 2 cannot reach the outlet 3 without passing through the filtration section 31. Note that if there is no need to remove foreign matter other than the magnetic material 8, the filtration section 31 may be omitted.

[0029] Of the above configurations, the foreign matter storage chamber 5 can be configured to be separable from the foreign matter removal chamber 4. In that case, the magnetic adsorption unit 11 and base unit 22, the outer casing 21, the filtration unit 31, etc., should be configured to be separable together with the foreign matter storage chamber 5. This allows for handling of damage to these parts.

[0030] Figure 3 is an explanatory diagram of an example of operation in one embodiment of the present invention, and Figure 4 is a partially enlarged view thereof. In the normal state, as shown in Figure 1, the magnetic adsorption part 11 is used with its sides covered by the outer casing 21. As described above, the fluid supplied from the inlet 2 flows into the foreign matter removal chamber 4. The magnetic force of the magnetic adsorption part 11 acts on the fluid through the outer casing 21, and if magnetic objects 8 are present in the fluid, they are attracted by the magnetic force and magnetically adsorbed onto the surface of the outer casing 21. The fluid from which the magnetic objects 8 have been removed passes through the filtration part 31, and other foreign matter is removed at that time. The fluid from which foreign matter has been removed after passing through the filtration part 31 is discharged from the outlet 3.

[0031] As the device is used in this manner, magnetically attracted magnetic material 8 will accumulate on the surface of the outer casing 21. If left as is, problems may occur, such as the inability to magnetically attract new magnetic material or the magnetically attracted material detaching and being discharged with the fluid. Therefore, it is necessary to perform maintenance work at appropriate times to remove the magnetically attracted magnetic material.

[0032] In one implementation, maintenance work can be performed by stopping the fluid flow and pulling out the gripping part 26. When the gripping part 26 is pulled out, the rod-shaped part 24, which serves as a means of movement, is pulled out, and the outer casing 21 connected to the rod-shaped part 24 is pulled and moves in the direction of the gripping part 26. At this time, most of the magnetic materials 8 magnetically attached to the surface of the outer casing 21 do not move in the direction of movement even when the outer casing 21 moves, but try to remain in the position where the magnetic force of the magnetic attachment part 11 is strong. Even if the outer casing 21 moves relative to the magnetic attachment part 11, most of the magnetic materials 8 do not move relative to the magnetic attachment part 11. Therefore, simply pulling and moving the outer casing 21 will not move the magnetic materials 8 together with the outer casing 21.

[0033] However, a flange portion 22 is provided at the end of the outer casing 21, and this flange portion 22 scrapes off the magnetic object 8. That is, when the flange portion 22 moves to the position where the magnetic object 8 is magnetically attracted, the magnetic object 8 comes into contact with the flange portion 22, and the magnetic object 8 can no longer remain in the position where it was magnetically attracted, and is moved by the flange portion 22. As shown in Figure 1, the positions where the magnetic force of the magnetic attraction portion 11 is strong are discrete, so when the magnetic object 8 is moved by the flange portion 22, the magnetic force that was attracting it weakens, and it separates from the surface of the outer casing 21 and falls. Alternatively, the magnetic object 8 that comes into contact with the flange portion 22 is pushed towards the outer circumference of the flange portion 22, and in this case as well, the magnetic force weakens as the distance from the magnet increases, and it also falls. In the example shown in Figure 1, a return portion 23 is provided on the outer circumference of the flange portion 22. As shown in Figure 4(A), the magnetic object 8 is held in the space between the flange portion 22 and the return portion 23, and by moving it to a position where the magnetic force weakens, the magnetic object 8 can be dropped as shown in Figure 4(B). In this way, the flange portion 22, or the flange portion 22 and the return portion 23, act like a scraper and can scrape off the magnetic object 8 that is magnetically attached to the surface of the outer casing 21.

[0034] As mentioned above, even with only the flange portion 22, the distance from the magnet can be increased to cause the magnetic object 8 to fall. However, depending on the magnetic force of the magnetic adsorption portion 11, the distance that must be separated increases, and the outer diameter of the flange portion 22 also increases. This can lead to a reduction in the flow area, hindering fluid inflow, or an increase in the size of the main body 1. By providing the return portion 23 as in this example, even if there is magnetic object 8 that cannot be dropped by the diameter of the flange portion 22 alone, the magnetic object 8 can be held and moved in the space between the flange portion 22 and the return portion 23, thereby ensuring the removal of the magnetic object 8. Furthermore, by providing the return portion 23, the outer diameter of the flange portion 22 can be reduced, securing the flow area, or the size of the main body 2 can be reduced.

[0035] As described above, when the gripping portion 26 is pulled out, the outer casing 21 is pulled and moves in the direction of the gripping portion 26. This movement of the outer casing 21 causes the flange portion 22 and the return portion 23 to scrape off the magnetic material 8 that is magnetically attached to the surface of the outer casing 21. This movement of the outer casing 21 can be performed smoothly by the movement of the projection 25 along the slit portion 13 provided in the base portion 12.

[0036] Figure 3 shows the gripping portion 26 fully extended. In this state, the flange portion 22 provided at the end of the outer casing 21 moves to a position away from the magnetic adsorption portion 11. Therefore, no magnetic force is generated on the outer casing 21. The magnetic material 8 scraped off before the outer casing 21 reaches this position accumulates at the bottom of the foreign matter storage chamber 5. At this point, most of the magnetic material 8 that was magnetically adsorbed to the surface of the outer casing 21 is removed. The simple maintenance work is completed by pushing the gripping portion 26 back in, returning the outer casing 21 to cover the magnetic adsorption portion 11, and the fluid inflow can be restarted. The surface of the outer casing 21 can then start operation in a good state where it can sufficiently magnetically adsorb magnetic material 8.

[0037] In the simple maintenance work described above, the scraped-off magnetic material 8 will accumulate in the foreign matter storage chamber 5. In addition, even in a single maintenance operation, a large amount of magnetic material 8 may be scraped into the foreign matter storage chamber 5. In such cases, work is performed to discharge the magnetic material 8 accumulated in the foreign matter storage chamber 5 to the outside. Furthermore, fine magnetic material 8 does not move to the flange portion 22 due to the magnetic force accompanying the movement of the outer casing 21 as described above, and the roughness of the surface of the outer casing 21 acts as resistance to movement by magnetic force, making it easy for it to remain on the surface of the outer casing 21. Tar-like magnetic material 8 may also not be completely removed by the up-and-down movement of the outer casing 21 as described above. Furthermore, if a filtration section 31 is provided, the foreign matter removed in this filtration section 31 also needs to be discharged to the outside.

[0038] For magnetic materials 8 and foreign matter that cannot be completely removed by such simple maintenance work, as well as magnetic materials 8 accumulated in the foreign matter storage chamber 5, maintenance work is performed to discharge them to the outside along with the internal fluid. Specifically, the fluid inflow is stopped, the gripping part 26 is pulled to lower the end of the outer casing 21 below the lower end of the magnetic adsorption part 11, and the foreign matter outlet 6 is opened. Then, the fluid inside the main body 1 flows to the foreign matter outlet 6, and the magnetic materials 8 accumulated in the foreign matter storage chamber 5 are discharged to the outside from the foreign matter outlet 6 along with the fluid. In addition, foreign matter attached to the filtration part 31 also falls into the foreign matter storage chamber 5 due to the flow and is discharged from the foreign matter outlet 6. Furthermore, fine particles and tar-like magnetic materials 8 of the magnetic material 8 remaining on the surface of the outer casing 21 also move to the bottom of the foreign matter storage chamber 5 over time, and also separate from the surface of the outer casing 21 with the flow of fluid and are discharged to the outside from the foreign matter outlet 6. In this way, the same effect as cleaning can be obtained by discharging the fluid, and foreign matter, including the magnetic material 8 removed from inside the main body 1, can be discharged to the outside through the foreign matter discharge port 6. After the maintenance work is completed, the foreign matter discharge port 6 is closed, the gripping part 26 is pushed in, and the magnetic adsorption part 11 is covered by the outer casing 21, thus completing the maintenance work. After that, the fluid inflow can be started again.

[0039] In such maintenance work, the end of the outer casing 21 is lowered below the lower end of the magnetic adsorption part 11, as described above. For example, when the magnetic adsorption part 11 is removed as in the configuration described in Patent Document 2, many of the magnetic materials 8 that were magnetically adsorbed to the surface of the outer casing 21 lose their magnetism and fall and settle. However, the magnetic materials 8 that remain on the surface of the outer casing 21 in the absence of magnetism may detach from the outer casing 21 due to the discharge of the fluid, and as they fall, they may adhere to the filtration part 31 and remain there. In particular, tar-like magnetic materials 8 become difficult to remove once they adhere to the filtration part 31. In this example, since the end of the outer casing 21 is lowered below the lower end of the magnetic adsorption part 11, the magnetic materials 8 that detach from the surface of the outer casing 21 due to the discharge of the fluid will not adhere to the filtration part 31 and will fall into the foreign matter storage chamber 5 and be discharged to the outside from the foreign matter discharge port 6.

[0040] Furthermore, if a screw-on lid is used, as in the configuration described in Patent Document 1, it is necessary to remove the lid using a tool, which is a troublesome task, and maintenance work cannot be performed until the internal fluid has also been drained. However, with a configuration like this example, simple maintenance work only requires lowering and raising the gripping part 26, which can be done with very simple operations. Therefore, it becomes possible to perform maintenance work frequently, and the device can always be used in good condition. Even when draining the internal fluid, as described above, the residue of magnetic material 8 is suppressed, and the removed magnetic material 8 can be efficiently discharged and recovered from the foreign matter discharge port 6.

[0041] Here, we have shown an example of applying the present invention to a so-called Y-type magnetic strainer, but the present invention can also be applied to strainers of other shapes, such as T-type and bucket-type strainers. Of course, it goes without saying that various modifications are possible without departing from the spirit of the present invention. [Explanation of symbols]

[0042] 1...Main body, 2...Inlet, 3...Outlet, 4...Foreign matter removal chamber, 5...Foreign matter storage chamber, 6...Foreign matter discharge port, 7...Packing member, 8...Magnetic material, 11...Magnetic adsorption part, 12...Base part, 13...Slit part, 14...Magnet, 21...Outer casing, 22...Flange part, 23...Return part, 24...Rod-shaped part, 25...Protrusion, 26...Gripping part, 31...Filtration part, 41...Filter part, 42...Magnet, 43...Cap.

Claims

1. A magnetic material removal device for removing magnetic materials contained in a fluid by magnetic adsorption, characterized by comprising: a magnetic adsorption means having magnetic force; an outer casing means enclosing the magnetic adsorption means and causing magnetic materials to be magnetically adsorbed to its outer surface by the magnetic force of the magnetic adsorption means; a flange portion provided at one end of the outer casing means that is wider than the outer diameter of the outer casing means; and a moving means provided at the other end of the outer casing means that moves the outer casing means along the extending direction of the magnetic adsorption means.

2. The magnetic material removal device according to claim 1, characterized in that the outer circumference of the flange portion is provided with a return portion that is bent toward the other end of the outer covering means.

3. Furthermore, the magnetic material removal device according to claim 1 or 2 is characterized by having a filtration means for removing foreign matter from the fluid.

Images