Filter element and internal pressure filter

Abstract

To provide a filter element suitable for reuse.SOLUTION: A filter element includes: a filter cloth 20 which has a cylindrical shape including an upper end opening 20a and a lower end opening 20b and has pleats 21 in a circumferential direction; an intermediate flange 30 connected to the upper end opening 20a of the filter cloth 20 and having a connection cylinder part 31 which maintains an opening state of the upper end opening 20a; and a bottom plate flange 40 having a connection cylinder part 41 connected to the lower end opening 20b of the filter cloth 20, and a bottom part 42 which closes the lower end opening 20b. A shape of the filter cloth 20 when the intermediate flange 30 is held and brought up is a shape in which a diameter is reduced toward the bottom plate flange 40.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a filter element suitable for reuse and an internal pressure filter using the filter element. [Background technology]

[0002] Patent Document 1 describes a filter element in which a filter body is fastened to a porous cylinder by a fastening band. When such a filter element is used in a so-called internal pressure type in which a fluid passes from the inside to the outside of the filter body, the filter element is housed in a cylindrical cage having an inner shape that is approximately the same as the outer shape of the filter body, and the filter body is used while abutting against the inner surface of the cage, so that the filter body does not burst due to internal pressure. When the filter element becomes clogged, the filter element is removed by pulling it out of the cage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 57-30512 Summary of the Invention [Problem to be solved by the invention]

[0004] The filter element in Patent Document 1 has a substantially uniform outer diameter from the top to the bottom, which can cause the filter body to get caught on the inner surface of the basket and break when the filter element is pulled out of the basket, making it difficult to reuse the filter element.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a filter element suitable for reuse. [Means for solving the problem]

[0006] The filter element of the present invention comprises a tubular filter cloth 20 having an upper end opening 20a and a lower end opening 20b, an intermediate flange 30 having a connecting tubular portion 31 connected to the upper end opening 20a of the filter cloth 20 and maintaining the upper end opening 20a in an open state, and a bottom plate flange 40 having a connecting tubular portion 41 connected to the lower end opening 20b of the filter cloth 20 and a bottom portion 42 that closes the lower end opening 20b, and is characterized in that when the filter cloth 20 is lifted by holding the intermediate flange 30, the shape of the filter cloth 20 is such that its diameter decreases toward the bottom plate flange 40.

[0007] In the above-mentioned filter element, the bottom plate flange 40 preferably has a finger grip portion 42a.

[0008] In addition, it is preferable that the intermediate flange 30 and the bottom plate flange 40 are each detachably connected to the filter fabric 20 .

[0009] In addition, the filter cloth 20 and the intermediate flange 30 and the bottom plate flange 40 are detachably connected by fastening bands 13, 16, and it is preferable that the connecting tubular portion 31 of the intermediate flange 30 and the connecting tubular portion 41 of the bottom plate flange 40 are provided with hook portions 33, 43, respectively, to prevent the fastening bands 13, 16 from coming off the connecting tubular portions 31, 41.

[0010] The internal pressure filter of the present invention comprises the above-described filter element 10, a main cage 50 having an accommodation section 57 for accommodating the filter element 10, and an upper opening 53a for inserting and removing the filter element 10 into and from the accommodation section 57, and is characterized in that the axial length L20 of the filter fabric 20 is longer than the inside height L57 of the accommodation section 57 of the main cage 50. Effect of the Invention

[0011] In the filter element of the present invention, when lifted by holding the intermediate flange, the shape of the filter fabric decreases in diameter toward the bottom plate flange. Therefore, when pulling the filter element out of the main cage, it is less likely to get caught if it is pulled out from the intermediate flange side, and after cleaning, it can be reattached to the main cage and used.

[0012] When the bottom plate flange has a finger grip, the bottom plate flange can be easily grasped by hand, making it easier to work, for example, when shaking off filtered matter adhering to the filter cloth.

[0013] When the intermediate flange and the bottom flange are detachably connected to the filter cloth, for example, the filter cloth can be replaced with a new one while the intermediate flange and the bottom flange continue to be used.

[0014] When the filter cloth and the intermediate flange or the bottom plate flange are removably connected by a tightening band, and the connecting tubular portion of the intermediate flange and the connecting tubular portion of the bottom plate flange are each provided with a hook portion to prevent the tightening band from coming off the connecting tubular portion, unintentional detachment can be prevented even if the filter cloth and the intermediate flange or the bottom plate flange are detachable.

[0015] In the internal pressure filter of the present invention, the axial length of the filter cloth is longer than the internal height of the housing of the main cage, so that the filter cloth becomes loose when the filter element is housed in the main cage. This looseness makes the filter cloth more likely to expand radially outward, ensuring a sufficient filtering area. Furthermore, when the filter element is pulled out from the upper opening, the expansion is also eliminated as the looseness is eliminated, making the removal operation easy. [Brief description of the drawings]

[0016] [Figure 1] 1 is an exploded perspective view of an internal pressure filter according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a vertical cross-sectional view of a filter element according to one embodiment of the present invention. [Diagram 3] FIG. 3A is a cross-sectional view of the filter fabric before it is attached to the intermediate flange and the bottom plate flange, and FIG. 3B is a side view thereof. [Figure 4] FIG. [Diagram 5] FIG. 4 is a horizontal end view of the side portion of the main cage. [Figure 6]FIG. 2 is a vertical cross-sectional view of an internal pressure filter. [Figure 7] FIG. 4 is a cross-sectional view showing a state in which a filter element is accommodated in a container. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Next, one embodiment of the internal pressure filter 1 and filter element 10 of the present invention will be described in detail with reference to the drawings. As shown in Fig. 1 to Fig. 7, the internal pressure filter 1 of the present invention comprises a filter element 10 and a container 11 that accommodates the filter element 10. The filter element 10 is used for filtering liquids such as coolant (cutting oil), and comprises a filter cloth 20, an intermediate flange 30, and a bottom plate flange 40, as shown in Fig. 1 and Fig. 2. The filter element 10 is portable, and has a size and weight that allows installation, removal, and cleaning work to be performed by a single worker.

[0018] As shown in Figs. 3A and 3B, the filter cloth 20 is cylindrical and has an upper end opening 20a and a lower end opening 20b at the axial end. It also has folds 21 in the circumferential direction (omitted in Figs. 6 and 7). The filter cloth 20 is made of a flexible sheet material, such as a nonwoven fabric. However, it may be made of woven fabric or paper. The folds 21 are formed by alternately repeating mountain folds and valley folds in the sheet material. The interval between the mountain folds and the valley folds is, for example, 10 to 30 mm, preferably 15 to 20 mm, and more preferably 17 mm. The circumferential length of the filter cloth 20 with the folds 21 stretched is, for example, 1.5 to 2.5 m, and preferably 1.9 m. The axial length L20 of the filter cloth 20 is longer than the inside height L57 of the storage section 57 of the main cage 50 described later, and is, for example, 400 mm.

[0019] 2, the intermediate flange 30 located at the upper part of the filter element 10 has a connecting tubular portion 31 connected to the upper end opening 20a of the filter fabric 20, and a protruding portion 32 extending radially outward from the upper end of the connecting tubular portion 31. The intermediate flange 30 is made of metal, specifically stainless steel.

[0020] A cylindrical packing 12 is fitted onto the connecting tubular portion 31. A hook portion 33 extending radially outward is provided at the lower end of the connecting tubular portion 31 to prevent the packing 12 from slipping out downward. The length of the hook portion 33 protruding radially outward is greater than the thickness of the packing 12.

[0021] The upper end opening 20a of the filter cloth 20 is fitted onto this connecting tube portion 31. The fastening band 13 is attached from the outside of the filter cloth 20 and fastened to connect the filter cloth 20 to the intermediate flange 30. Since the packing 12 is fitted onto the connecting tube portion 31, the fastening seals the gap between the filter cloth 20 and the connecting tube portion 31. Also, since a catch portion 33 is provided at the lower end of the connecting tube portion 31, the fastening band 13 will not come off the connecting tube portion 31. The filter cloth 20 can be removed by loosening the fastening band 13. In other words, the intermediate flange 30 and the filter cloth 20 are detachable.

[0022] The protruding portion 32 has an annular portion 34 that is substantially annular in plan view, and a handle 35 that extends radially outward from the annular portion 34 .

[0023] The annular portion 34 is placed on the receiving portion 53 of the main cage 50, which will be described later. It is also the portion on which the lid 60, which will be described later, is placed (see FIG. 6). It can therefore be said that the annular portion 34 is sandwiched between the receiving portion 53 and the lid 60. A recessed groove 34a for installing an O-ring 14 is provided on the upper surface of the annular portion 34. The O-ring 14 is for sealing the gap between the intermediate flange 30 and the lid 60.

[0024] The handle 35 is sized to protrude radially outward from the receiving portion 53 when the annular portion 34 is placed on the receiving portion 53, and can be easily grasped when lifting the intermediate flange 30. Although it is simply plate-shaped in Fig. 2, a separate handle may be attached or a hole for passing a finger through may be provided.

[0025] The bottom plate flange 40 located at the bottom of the filter element 10 has a connecting tubular portion 41 connected to the bottom end opening 20b of the filter fabric 20, and a bottom portion 42 that closes the bottom end of the connecting tubular portion 41. The material is metal, specifically stainless steel.

[0026] A cylindrical packing 15 is fitted onto the connecting tubular portion 41. A hook portion 43 extending radially outward is provided at the upper end of the connecting tubular portion 41 to prevent the packing 15 from slipping out upward. The length of the hook portion 43 protruding radially outward is greater than the thickness of the packing 15.

[0027] The lower end opening 20b of the filter cloth 20 is fitted onto this connecting tube portion 41. The fastening band 16 is attached from the outside of the filter cloth 20 and fastened to connect the filter cloth 20 to the bottom plate flange 40. Since the packing 15 is fitted onto the connecting tube portion 41, the fastening seals the gap between the filter cloth 20 and the connecting tube portion 41. Also, since a catch portion 43 is provided at the upper end of the connecting tube portion 41, the fastening band 16 will not come off the connecting tube portion 41. The filter cloth 20 can be removed by loosening the fastening band 16. In other words, the bottom plate flange 40 and the filter cloth 20 are detachable.

[0028] The outer diameter D41 of the connection tubular portion 41 of the bottom plate flange 40 is smaller than the outer diameter D31 of the connection tubular portion 31 of the intermediate flange 30. Therefore, when the filter cloth 20 connected to the intermediate flange 30 and the bottom plate flange 40 is lifted by holding the intermediate flange 30, the filter cloth 20 has a shape in which the outer diameter gradually decreases toward the bottom plate flange 40. For example, the connection tubular portion 41 of the bottom plate flange 40 is 80A (piping standard), and the connection tubular portion 31 of the intermediate flange 30 is 100A (piping standard). It is preferable that the difference in diameter is 20 mm or more.

[0029] The bottom portion 42 is a disk having a diameter of, for example, 120 mm, which is larger than the outer diameter D41 of the connecting tube portion 41. Therefore, in a plan view, it protrudes radially outward from the connecting tube portion 41. The amount of protrusion is approximately uniform in the circumferential direction, for example, about 15 mm, and this protruding portion becomes the finger hook portion 42a. Specifically, when the bottom plate flange 40 is grasped with the palm facing the bottom portion 42, the multiple fingertips can be hooked.

[0030] In the filter element 10 configured as described above, the upper end opening 20a of the filter cloth 20 is kept open by the connecting tube portion 31 of the intermediate flange 30, and the lower end opening 20b of the filter cloth 20 is closed by the bottom portion 42 of the bottom plate flange 40. A fluid such as a coolant is poured from the upper end opening 20a, passes through the filter cloth 20, and flows out of the filter element 10.

[0031] The filter element 10 is used while being housed in a storage container 11 shown in Fig. 4. The storage container 11 includes a main cage 50 and a lid 60. The storage container 11 is made of a metal, specifically, stainless steel. The storage container 11 and the internal pressure filter 1 are also preferably portable, and have a size and weight that allows installation, removal, and cleaning work to be performed by a single worker.

[0032] The main cage 50 is a cylindrical shape with a bottom and an upper opening 53a, and has a cylindrical side portion 51, a closing portion 52 that closes the lower end of the side portion 51, and a receiving portion 53 provided at the upper end of the side portion 51.

[0033] As shown in FIG. 5, the inner peripheral surface of the side portion 51 has ridges 54 and valleys 55 continuously provided in the circumferential direction (omitted in FIG. 6 and FIG. 7). The ridges 54 and valleys 55 are formed by folding a plate material to form pleats in the circumferential direction. The height of the ridges 54 (depth of the valleys 55) is preferably matched to the height of the pleats 21 of the filter cloth 20. In addition, it is preferable to match the number of the ridges 54 to the number of the pleats 21 of the filter cloth 20. For example, 50 to 80 ridges 54 are provided, preferably 60 to 70 ridges, and more preferably 66 ridges are provided. The side portion 51 has a large number of holes to provide liquid permeability. However, it may be a net. In order to suppress outward deformation of the side portion 51, it is preferable to provide a ring material 56 on the outer periphery of the side portion 51, as shown in FIG. 1 and FIG. 4.

[0034] Closing portion 52 is a disk attached to the lower end of side portion 51. The outer diameter is at least equal to the outermost diameter of side portion 51 (the outer diameter of ridges 54), and completely closes the lower end of side portion 51. The area surrounded by closing portion 52 and side portion 51 forms storage portion 57.

[0035] The inner height L57 of the storage section 57 is, for example, 300 mm. Therefore, the axial length L20 of the filter cloth 20 is longer, and when the filter element 10 is stored in the storage section 57, the filter cloth 20 becomes slack (see FIG. 6). The amount of slack (extra length) is set to an amount that allows the filter cloth 20 to come into close contact with the inner circumferential surface of the side portion 51 when the filter cloth 20 expands due to internal pressure. Therefore, it is appropriately adjusted in accordance with the relationship between the outer diameters D31 and D41 of the connecting tubular portion 31 of the intermediate flange 30 and the connecting tubular portion 41 of the bottom plate flange 40 and the inner diameter of the side portion 51.

[0036] The receiving portion 53 is a circular ring attached to the upper end of the side portion 51 and has an opening in the center. This opening becomes the upper opening 53a of the main cage 50. The size of the upper opening 53a is equal to or slightly smaller than the innermost diameter of the side portion 51 (the outer diameter of the valley 55). Also, it is set to be 1.3 times or more the outermost diameter of the bottom plate flange 40 (the outer diameter of the bottom portion 42). The outermost diameter of the receiving portion 53 is larger than the outermost diameter of the side portion 51 and extends radially outward from the side portion 51. A recessed groove 53b for installing an O-ring 17 is provided on the upper surface of the receiving portion 53. The O-ring 17 is for sealing between the receiving portion 53 and the intermediate flange 30.

[0037] The cover 60 comprises a disk-shaped base 61, a connection port 62 attached to the base 61, and a handle 63 attached to the upper surface of the base 61. The outer diameter of the base 61 is approximately equal to the outer diameter of the annular portion 34 of the intermediate flange 30. The connection port 62 is for introducing a fluid into the filter element 10. It is a cylinder that protrudes upward from the center of the upper surface of the base 61 and communicates in the axial direction. It can also be said that it penetrates the base 61. Its size is, for example, 25A (piping standard). The handle 63 is approximately inverted U-shaped when viewed from the side, and is attached to two places on the upper surface of the base 61.

[0038] As shown in Fig. 6, the annular portion 34 of the intermediate flange 30 is placed on the receiving portion 53 of the main cage 50, and the base body 61 of the cover body 60 is placed on the annular portion 34. The receiving portion 53, the annular portion 34, and the base body 61 are detachably fixed by bolts that pass through these three members. To facilitate the fixing operation, the receiving portion 53 is provided with a guide rod 58 (see Fig. 1), and the annular portion 34 and the base body 61 are provided with insertion holes 34b, 61a through which the guide rod 58 can be inserted, respectively.

[0039] Next, a method of using the internal pressure filter 1 having the above-mentioned configuration will be described. First, the filter element 10 is accommodated in the accommodation container 11. Specifically, as shown in FIG. 7, the bottom plate flange 40 is inserted into the main cage 50 from the upper opening 53a of the main cage 50. The bottom plate flange 40 is inserted until the annular portion 34 of the intermediate flange 30 is placed on the receiving portion 53 of the main cage 50 while abutting on the blocking portion 52 of the main cage 50, and then the lid 60 is placed on the annular portion 34 and fixed with a bolt. Before attaching the lid 60, the filter cloth 20 may be pushed open by hand or the like. Since the axial length L20 of the filter cloth 20 is longer than the inner height L57 of the accommodation portion 57 of the main cage 50, the filter cloth 20 is in a loose state in the accommodation portion 57 and can be easily pushed open. After that, a pipe is connected to the connection port 62 of the lid 60, and a fluid such as a coolant is introduced into the filter element 10. The fluid filtered by the filter cloth 20 is discharged to the outside through the side portion 51 of the main cage 50 (see the solid arrow in FIG. 6). In essence, it is an internal pressure type. When fluid is introduced, internal pressure is applied to the filter cloth 20, so the filter cloth 20 naturally expands and comes into close contact with the inner surface of the side portion 51 of the main cage 50. Specifically, the folds 21 of the filter cloth 20 enter the ridges 54 of the main cage 50.

[0040] Filtration continues, and when the filtration resistance of the filter element 10 exceeds a predetermined value, use is stopped and the filter element 10 is removed from the storage container 11. Specifically, the cover 60 is removed, and the filter element 10 is pulled upward by holding the handle 35 of the intermediate flange 30. Since the shape of the filter cloth 20 when lifted by holding the intermediate flange 30 is a shape in which the diameter decreases toward the bottom plate flange 40, it is easy to pull out. Since it is an internal pressure type, filtered material such as sludge accumulates inside the filter element 10. To remove the filtered material, for example, the filter element 10 is grasped with one hand so that the finger is hooked on the finger hook portion 42a of the bottom plate flange 40, and is turned upside down and shaken.

[0041] After cleaning, the filter element 10 can be reused by storing it in the storage container 11. The filter cloth 20 can also be replaced as necessary. In this case, the fastening bands 13, 16 are loosened, the intermediate flange 30 and the bottom plate flange 40 are removed from the filter cloth 20, and the intermediate flange 30 and the bottom plate flange 40 are attached to a new filter cloth 20. It is also possible to replace the intermediate flange 30 and the bottom plate flange 40.

[0042] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, as long as the side portion 51 of the main cage 50 has ridges 54 and valleys 55 on the inner peripheral surface, it is not necessary that the ridges 54 and valleys 55 are provided on the outer peripheral surface, and the outer peripheral surface may be smooth, for example.

[0043] As the tightening bands 13 and 16, for example, stainless steel bands, pole bands, or screw-type bands called hose bands are used. Specifically, the tightening bands 13 and 16 are provided with a band portion, a housing portion attached to one end of the band portion and through which the other end of the band portion is inserted, and a screw gear housed in the housing portion, and the band portion has a series of holes that mesh with the screw gear, and the other end of the band portion is fed into and out of the housing portion by turning the screw gear. However, the tightening bands 13 and 16 are not limited to the above, and any other known means may be used as long as the inner diameter is adjustable, such as a so-called cable tie, in which the band portion has a series of teeth and the housing portion has a lock portion that engages with the teeth, and the lock portion restricts the inner diameter from being increased, but the inner diameter can be increased by releasing the lock portion, or the tightening band 16 itself has an elasticity that allows the inner diameter to be changed.

[0044] Also, a clean tank may be provided to house the storage vessel 11. In this case, the filtered fluid that flows out of the main cage 50 can be stored. [Explanation of symbols]

[0045] 1. Internal pressure filter 10 Filter element 11 Containment Container 12 Packing 13 Fastening band 14 O-ring 15 Packing 16 Fastening band 17 O-ring 20 Filter cloth 20a Top opening 20b Bottom opening 21 Folds 30 Intermediate flange 31 Connection tube 32 Protruding part 33 Hook 34 Circular Ring 34a groove 34b Insertion hole 35 Handle 40 Bottom plate flange 41 Connection tube 42 Bottom 42a Finger grip 43 Hook 50 Main body cage 51 Side part 52 Occlusion 53 Receiving part 53a Top opening 53b Groove 54 Mountain 55 Valley 56 Ring material 57 Storage unit 58 Guide Stick 60 Lid 61 Base 61a Insertion hole 62 Connection port 63 Handle L20 Axial length of filter cloth D31 Outer diameter of connecting tube of intermediate flange D41 Outer diameter of the connecting tube of the bottom plate flange L57 Inner height of the cage housing

Claims

1. A cylindrical filter cloth having an upper end opening and a lower end opening; an intermediate flange having a connecting tube portion connected to an upper end opening of the filter fabric and maintaining the upper end opening in an open state; A bottom plate flange having a connecting tube portion connected to a lower end opening of the filter cloth and a bottom portion closing the lower end opening, A filter element in which the shape of the filter fabric when lifted by holding the intermediate flange is such that the diameter decreases toward the bottom plate flange.

2. 2. The filter element of claim 1, wherein the base flange has a finger grip.

3. 2. The filter element according to claim 1, wherein an intermediate flange and a bottom flange are each detachably connected to the filter fabric.

4. The filter cloth is detachably connected to the intermediate flange and bottom flange by fastening bands.

4. The filter element according to claim 3, wherein the connecting tubular portion of the intermediate flange and the connecting tubular portion of the bottom plate flange are each provided with a hook portion for preventing the fastening band from coming off the connecting tubular portion.

5. A filter element according to claim 1; a main cage having a storage section for storing a filter element and an upper opening for inserting and removing the filter element into and from the storage section; An internal pressure filter in which the axial length of the filter fabric is longer than the inside height of the housing section of the main cage.

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