Filter device

Abstract

Dust can be easily disposed of. [Solution] The filter comprises a case having a cylindrical first side surface and a bottom surface covering one end of the first side surface; a head provided to cover the opening of the case; a filter element provided in the space formed by the case and the head, the filter element having a cylindrical filter material and a first plate and a second plate covering both ends of the filter material, respectively; a cylindrical adsorption member provided on the inner circumferential surface of the first side surface; and a separation wall having a cylindrical second side surface provided between the filter material and the adsorption member. The head has an inlet into which the liquid to be filtered flows in, an outlet out which the filtered liquid flows out, and a cylindrical part communicating with the outlet. The first plate is provided on the cylindrical part so as to communicate with the hollow part of the filter material and the hollow part of the cylindrical part. The upper end of the separation wall is provided on the first plate or the head. The hollow part of the inlet and the space between the adsorption member and the separation wall communicate with each other, and gaps are formed between the separation wall and the bottom surface of the case and between the separation wall and the filter material.

Description

【Technical Field】 【0001】 The present invention relates to a filter device. 【Background Art】 【0002】 Patent Document 1 discloses a liquid cyclone filtration device that combines centrifugal separation by a liquid cyclone and filter filtration separation. The liquid cyclone filtration device described in Patent Document 1 sandwiches a partition plate provided with a filter filtration mechanism at a position near the ceiling wall of a columnar hollow portion in a container composed of a columnar hollow portion and an inverted conical hollow portion, and a cartridge support cylinder is provided at the center of the partition plate, and a plurality of filter cylinders are suspended from its outer periphery. Further, the filter cylinder is a bottomed cylinder made of a porous plate material with a filter cloth attached thereto. On the other hand, a cartridge-type filter made of a cylindrical filter medium with a smaller filtration accuracy than the filter cloth is vertically fixed between the bottom of the cartridge support cylinder and the filtration water outlet provided at the center of the ceiling wall, and the axial hollow portion of the filter and the outlet are communicated. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2019-42614 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the filter device described in Patent Document 1, since the coarse particles separated from the suspension by centrifugal separation accumulate at the bottom of the case as a slurry, they must be discharged together with the slurry and the suspension in the container at regular intervals, which is troublesome to process. In addition, before the coarse particles separated by centrifugal separation accumulate at the bottom of the case, the coarse particles are lifted up by the suspension, and clogging of the filter medium occurs early, and as a result, the replacement cycle of the filter medium may be shortened. 【0005】 This invention has been made in view of these circumstances, and aims to provide a filter device that can reduce the frequency of filter media replacement. [Means for solving the problem] 【0006】 To solve the above problems, the filter device according to the present invention comprises, for example, a case having a cylindrical first side surface and a bottom surface covering one end of the first side surface; a head provided to cover the opening of the case; a filter element provided in the space formed by the case and the head, the filter element having a cylindrical filter material and a first plate and a second plate covering both ends of the filter material, respectively; a cylindrical adsorption member provided on the inner circumferential surface of the first side surface; and a cylindrical second side surface provided between the filter material and the adsorption member. The head comprises a separation wall and a head, the head having an inlet into which the liquid to be filtered flows, an outlet outlet into which the filtered liquid flows out, and a cylindrical portion communicating with the outlet outlet, the first plate is provided on the cylindrical portion such that the hollow portion of the filter material and the hollow portion of the cylindrical portion communicate with each other, the upper end of the separation wall is provided on the first plate or the head, the hollow portion of the inlet communicates with the space between the adsorption member and the separation wall, and gaps are formed between the separation wall and the bottom surface of the case and between the separation wall and the filter material. 【0007】 According to the filter device of the present invention, a head having an inlet into which the liquid to be filtered flows, an outlet outlet into which the filtered liquid flows out, and a cylindrical part communicating with the outlet outlet is provided with a first plate of a filter element, and a separation wall having a cylindrical second side surface is provided between a cylindrical adsorption member provided on the inner circumferential surface of the first side surface of the case and the filter material of the filter element. The liquid flowing in from the inlet flows into the space between the adsorption member and the separation wall, and dust is adsorbed onto the adsorption member, so the dust can be processed by replacing the adsorption member. Therefore, dust can be easily processed. 【0008】 Furthermore, according to the filter device of the present invention, since the liquid passes through the filter medium after dust has been adsorbed onto the adsorption member, clogging of the filter medium is prevented, thereby reducing the frequency of filter medium replacement. In addition, by adsorbing larger dust particles onto the adsorption member first, the size of the dust particles passing through the filter medium is reduced, and as a result, the resistance of the fluid passing through the filter medium is reduced, thereby preventing an increase in pressure loss. This eliminates the need for valves. 【0009】 The lower end of the separation wall may be located near the lower end of the filter material. This prevents liquid that does not have dust adsorbed by the adsorption member from passing through the filter material. As a result, the entire filter material can be used effectively, and the frequency of filter material replacement can be reduced. 【0010】 The inlet may allow the liquid to flow in along a tangent to the cylindrical portion at any position. This generates a vortex, which allows the dust to be efficiently adsorbed onto the adsorption member by centrifugal force. 【0011】 The filter element has the separation wall, which is provided on the first plate, and a second adsorption member may be provided on the outer circumferential surface of the second side. This makes it possible to prevent clogging of the filter material more efficiently. [Effects of the Invention] 【0012】 According to the present invention, dust can be easily disposed of. [Brief explanation of the drawing] 【0013】 [Figure 1] A schematic perspective view of filter device 1. [Figure 2] This is a schematic front view of the filter device 1. [Figure 3] This is a cross-sectional view AA in Figure 2. [Figure 4] Figure 2 is a cross-sectional view of BB. [Figure 5] A perspective view (partially cross-sectional view) showing the general structure of filter device 1. [Figure 6] It is a diagram showing the outline of the filter device 1 and is a diagram with a partially enlarged view. [Figure 7] It is a diagram showing the outline of the filter device 1 and is a diagram with a partially enlarged view. [Figure 8] It is a diagram showing the outline of the filter device 1 and is a diagram with a partially enlarged view. [Figure 9] It is a diagram schematically showing the positional relationship among the head 20, the suction member 40, the filter element 50, and the separation wall 60. 【Embodiments for Carrying Out the Invention】 【0014】 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The filter device of the present invention removes dust and the like contained in liquids such as oil and water using a filter. Hereinafter, the filter device of the present invention will be described by taking a line filter installed on the pump discharge side of a hydraulic circuit as an example. However, the filter device of the present invention is not limited to a line filter. 【0015】 <The First Embodiment> FIGS. 1 and 2 are diagrams showing the outline of the filter device 1. FIG. 1 is a perspective view, and FIG. 2 is a front view. FIG. 3 is a sectional view taken along line A - A of FIG. 2, and FIG. 4 is a sectional view taken along line B - B of FIG. 2. FIG. 5 is a perspective view showing the outline of the filter device 1 with a part shown in section. The filter device 1 mainly includes a case 10, a head 20, an indicator 30, a suction member 40, a filter element 50, and a separation wall 60. 【0016】 Hereinafter, the vertical direction on the paper surface of FIGS. 1 and 2 is defined as the z - direction, the upper side is the +z side, and the lower side is the -z side. Also, the directions orthogonal to the z - direction are defined as the x - direction and the y - direction. The x - direction and the y - direction are orthogonal to each other. 【0017】 The case 10 has a cylindrical side surface 11 (corresponding to the first side surface of the present invention) and a bottom surface 12 that covers one end of the side surface 11. The bottom surface 12 is provided at the lower end of the side surface 11 (here, the end on the -z side). The upper end of the side surface 11 (the end on the +z side) is an opening 11c. A screw portion 11d is formed near the opening 11c of the case 10. 【0018】 The head 20 is provided on the case 10 so as to cover the opening 11c. One end of the head 20 is open, and a screw portion 20b is provided near this opening 20a. By screwing the screw portion 20b and the screw portion 11d together, the head 20 is provided on the case 10, and a space is formed inside the case 10 and the head 20 into which the suction member 40, the filter element 50, and the separation wall 60 are inserted. Also, a seal member 31 is provided between the case 10 and the head 20, and the seal member 31 prevents liquid leakage. 【0019】 An indicator 30 for measuring the pressure in the internal space of the case 10 is provided on the head 20. However, the indicator 30 is not essential. 【0020】 The head 20 mainly has an inflow portion 21 into which the liquid to be filtered flows, a cylindrical portion 22 in which the filter element 50 is provided, and an outflow portion 23 through which the filtered liquid flows out. 【0021】 Figures 6 and 7 are diagrams showing the outline of the filter device 1, and are diagrams in which a part (near the head 20) is enlarged. The head 20 has a hollow interior and is partitioned into two spaces by the outflow portion 23 and the cylindrical portion 22. The hollow portion of the inflow portion 21 communicates with the outer space S1 partitioned by the outflow portion 23 and the cylindrical portion 22, and the inflow portion 21 allows liquid to flow into the space S1. The space formed by the communication between the hollow portion (hole 23c) of the outflow portion 23 and the hollow portion 22a of the cylindrical portion 22 is the space S2. The space S1 and the space S2 are partitioned by the end face 22b of the outflow portion 23. 【0022】 Let's return to the explanation of Figures 3, 4, and 5. The adsorption member 40 is a cylindrical member provided on the inner circumferential surface 11a of the side surface 11. The adsorption member 40 is made of, for example, a nonwoven fabric or a porous synthetic resin having many fine holes inside. In this embodiment, the adsorption member 40 is constructed by attaching a sheet-like member capable of adsorbing dust, such as a nonwoven fabric, to the inner circumferential surface of a cylindrical member made of resin, using an adhesive, double-sided tape, etc. In addition, to prevent the adsorption member 40 from rotating relative to the side surface 11, a rib 41 formed along the longitudinal direction is fitted into an elongated hole 11b formed in the inner circumferential surface 11a. By making the outside of the adsorption member 40 out of resin, the rib 41 can be easily formed. Also, by pulling out the rib 41 from the elongated hole 11b, the adsorption member 40 can be easily removed from the side surface 11. However, the configuration of the adsorption member 40 is not limited to this. 【0023】 A filter element 50 is provided in the space formed by the case 10 and the head 20. The filter element 50 mainly consists of a filter medium 51, plates 52 and 53 provided at both ends of the filter medium 51, and a separation wall 60. 【0024】 The filter material 51 is cylindrical in shape and has open ends. The filter material 51 is formed by folding a sheet of filter paper made of synthetic resin or paper into pleats, connecting the ends of the pleated filter paper, and rolling it into a cylindrical shape. In this embodiment, the liquid to be filtered is filtered as it moves from the outside to the inside of the filter material 51. 【0025】 An inner cylinder (not shown) may be provided inside the filter material 51. The inner cylinder is a cylindrical member provided in the hollow part of the filter material 51, and has numerous holes through which oil passes. 【0026】 Plates 52 and 53 are provided on the filter material 51 so as to cover the opening at the end of the filter material 51. Plate 52 (corresponding to the first plate of the present invention) is provided on the upper side of the filter material 51, and plate 53 (corresponding to the second plate of the present invention) is provided on the lower side of the filter material 51. 【0027】 As shown in Figure 7, the plate 52 is provided on the cylindrical portion 22. By providing the plate 52 on the cylindrical portion 22, the hollow portion of the filter material 51 and the hollow portion 22a of the cylindrical portion 22 are connected. Therefore, the filtered liquid that flows into the inside of the filter material 51 moves to the hollow portion of the filter material 51 and the hollow portion 22a of the cylindrical portion 22, i.e., space S2. 【0028】 The separation wall 60 mainly has a cylindrical side surface 61 (corresponding to the second side surface of the present invention) and a mounting portion 62. The mounting portion 62 is a disc-shaped member and is provided at the upper end of the side surface 61. By attaching the mounting portion 62 to the upper surface of the plate 52, the upper end of the separation wall 60 is provided on the plate 52. 【0029】 Note that the mounting portion 62 is not mandatory for the separation wall 60; for example, the separation wall 60 may consist only of a side surface 61. In this case, it is sufficient that the upper end of the side surface 61 is provided on the plate 52. 【0030】 The side surface 61 is provided between the filter material 51 and the adsorption member 40 and is positioned along the outer circumferential surface of the filter material 51. The lower end of the separation wall 60 (side surface 61) is located near the lower end of the filter material 51. In this embodiment, the lower end of the separation wall 60 (side surface 61) and the lower end of the filter material 51 are approximately coincident. 【0031】 As shown in Figures 3-5, a gap is formed between the side surface 61 and the filter material 51. Therefore, the liquid can pass through the space between the side surface 61 and the filter material 51. The gap between the side surface 61 and the filter material 51 is space S4. In addition, a gap is formed between the side surface 61 and the adsorption member 40. The gap between the side surface 61 and the adsorption member 40 is included in space S3. 【0032】 As shown in Figure 7, space S3 is the space outside the filter element 50 within the space formed by the case 10 and the head 20. Space S3 is in communication with space S1, and the liquid before filtration that flows in from the inlet 21 flows into space S3 via space S1. Also, as shown in Figures 4 and 5, a gap is formed between the side surface 61 and the bottom surface 12, that is, on the -z side of the side surface 61. 【0033】 Figure 8 is a schematic diagram of the filter device 1, showing a magnified view of a portion of it (near the lower end of the filter element 50). The case 10 is not shown in Figure 8. The liquid before filtration that flows into space S3 flows into space S4 through the -z side of side 61 (between side 61 and bottom surface 12) (see dashed arrow). 【0034】 Next, the function of the filter device 1 will be explained using Figures 4 to 8. In the figures, the dashed arrows indicate the flow of liquid. The liquid before filtration flows into the filter device 1 from the inlet 21. The liquid before filtration first flows through space S1 into space S3. Since an adsorption member 40 is provided in space S3, dust particles are adsorbed onto the adsorption member 40 as the liquid passes through space S3. Relatively large dust particles are adsorbed onto the adsorption member 40. 【0035】 Figure 9 schematically shows the positional relationship between the head 20 (inlet 21, cylindrical part 22), the adsorption member 40, the filter element 50, and the separation wall 60 (side surface 61). Because the central axis ax2 of the inlet 21 is offset from the central axis ax1 of the cylindrical part 22 (the central axes of the filter element 50, the separation wall 60, and the side surface 11 are also the central axis ax1) (see Figure 5), the liquid flowing in from the inlet 21 flows into space S1 along the tangent at any position M of the cylindrical part 22. As a result, the liquid becomes a vortex flow in space S1. 【0036】 The liquid flowing into space S1 moves in the -z direction due to gravity and flows from space S1 to space S3. Since the central axis ax1 of the cylindrical portion 22 and the separation wall 60 are the same, the liquid that becomes a vortex in space S1 also becomes a vortex in space S3. As a result, the liquid flows along the adsorption member 40, making it easier for dust to be adsorbed onto the adsorption member 40 by centrifugal force. 【0037】 Returning to the explanation of Figures 4 to 8, the liquid after dust has been adsorbed onto the adsorption member 40 flows from space S3 into space S4. Since the lower end of the separation wall 60 is located near the lower end of the filter material 51, the liquid can be prevented from coming into contact with the filter material 51 before dust is adsorbed onto the adsorption member 40. 【0038】 The liquid flowing into space S4 passes through the filter material 51 and flows into the hollow part of the filter material 51. Since the liquid after dust has been adsorbed by the adsorption member 40 passes through the filter material 51, the filter material 51 is less likely to clog compared to the case without the adsorption member 40. In addition, it is assumed that relatively large dust particles move to the outside due to centrifugal force, and that large dust particles are preferentially adsorbed by the adsorption member 40, resulting in the liquid containing small dust particles passing through the filter material 51. Therefore, high pressure loss due to clogging of the filter material 51 is prevented. 【0039】 The filtered liquid that flows into the hollow section of the filter material 51 moves into the hollow section 22a of the cylindrical section 22, i.e., the space S2, and flows out from the outlet section 23. 【0040】 As the filtration capacity of the adsorption member 40 and filter media 51 gradually decreases due to the filtration of liquid, the adsorption member 40 and filter element 50 are replaced periodically or as needed. Since the replacement times for the adsorption member 40 and filter element 50 are different, the adsorption member 40 and filter element 50 are configured to be replaceable separately. 【0041】 First, remove the case 10 from the head 20. Since the case 10 is connected to the filter element 50 and the separation wall 60, removing the case 10 from the head 20 separates the head 20 from the rest, and the adsorption member 40, filter element 50 and separation wall 60 are separated. It is exposed through opening 11c. 【0042】 When the suction member 40 is pulled out from the opening 11c, the rib 41 is pulled out from the elongated hole 11b, and the suction member 40 is removed from the case 10. The suction member 40 is replaced by removing the old suction member 40 and installing a new suction member 40 on the inner circumferential surface 11a. If only the suction member 40 is to be replaced, the case 10 is attached to the head 20 after the suction member 40 is replaced. Alternatively, the filter element 50 and the separation wall 60 are removed from the case 10 by pulling them out in the +z direction from the opening 11c. The filter element 50 and the separation wall 60 are replaced by pushing a new filter element 50 and separation wall 60 into the case 10 through the opening 11c. Finally, the case 10 is attached to the head 20, completing the assembly of the filter device 1. 【0043】 According to this embodiment, dust contained in the fluid is first adsorbed by the adsorption member 40, and the liquid after the dust has been adsorbed by the adsorption member 40 is filtered by the filter material 51. This prevents clogging of the filter material 51 and reduces the need to replace the filter element 50. Since only the adsorption member 40 needs to be replaced instead of the filter element 50, maintenance is easy and running costs can be reduced. 【0044】 Furthermore, according to this embodiment, since dust is adsorbed by the adsorption member 40, dust does not accumulate at the bottom of the case 10. Therefore, maintenance is easy as only the adsorption member 40 needs to be replaced and there is no need to separately discharge the dust. 【0045】 Furthermore, according to this embodiment, since the liquid flowing in from the inlet 21 flows into the space S1 along the tangent at any position M of the cylindrical portion 22, the liquid flow in the space S3 also becomes a vortex, and the centrifugal force collects the dust outwards, thereby efficiently adsorbing the dust onto the adsorption member 40. 【0046】 Furthermore, according to this embodiment, since the case 10 is provided with an adsorption member 40 and the liquid after dust has been adsorbed by the adsorption member 40 is filtered by the filter material 51, it is possible to prevent the pressure loss from increasing due to clogging of the filter material 51. For example, if the pressure loss increases, it can lead to malfunction of the hydraulic equipment to which the filter device 1 is installed, so by reducing the pressure loss, malfunction can be prevented. 【0047】 Furthermore, according to this embodiment, since the pressure loss does not increase by providing the adsorption member 40, a relief valve is not required in the filter device 1. As a result, the structure of the filter device 1 can be simplified and malfunctions can be reduced. In addition, the manufacturing cost of the filter device 1 can be reduced by eliminating the relief valve. 【0048】 In this embodiment, the liquid flowing in from the inlet 21 is introduced into space S1 along the tangent at an arbitrary position M of the cylindrical portion 22, generating vortices in spaces S1 and S3. However, vortices are not essential. Even if the liquid is simply flowed along the z-direction, dust can still be adsorbed by the adsorption member 40. However, generating vortices is desirable in order to efficiently adsorb dust onto the adsorption member 40. 【0049】 Furthermore, in this embodiment, the inner circumferential surface 11a of the side surface 11 and the adsorption member 40 were cylindrical (the diameter did not change), but the shape of the inner circumferential surface 11a and the adsorption member 40 is not limited to this. For example, the diameter of the inner circumferential surface 11a and the adsorption member 40 may gradually decrease as they move toward the -z direction. This is expected to efficiently adsorb dust onto the adsorption member 40. 【0050】 Furthermore, in this embodiment, a separation wall 60 is provided along the outer surface of the filter material 51, but an adsorption member may be provided on the outer surface of the separation wall 60. This adsorption member can be made of the same material as the adsorption member 40. The adsorption member can be attached to the outer surface of the separation wall 60 by adhesion or the like. In this case, dust can be adsorbed on both sides of the cylindrical space S3. In particular, when vortex flow is not generated, it is desirable to provide an adsorption member not only on the adsorption member 40 but also on the outer surface of the separation wall 60. 【0051】 Furthermore, in this embodiment, the filter element 50 has a separation wall 60, and the separation wall 60 is provided on the plate 52, but the separation wall 60 does not have to be included in the filter element 50. For example, the separation wall 60 may be separated from the filter element 50, the upper end of the separation wall 60 may be provided on the head 20, and the separation wall 60 may be arranged along the outer circumferential surface of the filter media 51. When the filter element 50 has a separation wall 60, the separation wall 60 must be replaced when the filter element 50 is replaced, but by separating the separation wall 60 from the filter element 50, it becomes unnecessary to replace the separation wall 60, which does not need to be replaced, along with the filter element 50. However, if an adsorption member is provided on the outer circumferential surface of the separation wall 60, it is desirable to include the separation wall 60 in the filter element 50 and provide the upper end of the separation wall 60 on the plate 52. 【0052】 Furthermore, in this embodiment, the lower end of the separation wall 60 is located near the lower end of the filter material 51, but the position of the lower end of the separation wall 60 is not limited to this. However, in order to adsorb dust onto the adsorption member 40 before the liquid comes into contact with the filter material 51, it is desirable that the lower end of the separation wall 60 be located near the lower end of the filter material 51. At a minimum, it is desirable that the separation wall 60 covers about half to two-thirds or more of the side surface of the filter material 51. 【0053】 Although embodiments of this invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are also included within the scope of the gist of this invention. Those skilled in the art can modify, add, or change each element of the embodiments as appropriate. 【0054】 Furthermore, in this invention, "approximately identical" is a concept that includes not only cases where the objects are strictly identical, but also errors or modifications that do not result in a loss of identity. For example, "approximately identical" is a concept that includes errors that do not result in a loss of identity, and is not limited to cases where the objects are strictly identical. Also, for example, when simply using the term "identical," it includes not only cases where the objects are strictly identical, but also cases where they are approximately identical. Furthermore, in this invention, "neighborhood" means including a certain range (which can be arbitrarily defined) of area near a reference position. For example, when referring to the neighborhood of A, it means a certain range of area near A, which may or may not include A. [Explanation of Symbols] 【0055】 1: Filter device 10: Case 11: Side view 11a: Inner surface 11b: Long hole 11c: Opening 11d: Threaded part 12: Bottom 20: Head 20a: opening 20b: Threaded part 21 :Inflow part 22: Cylindrical part 22a: Hollow part 22b: End face 23: Outlet 23c: Hole 30: Indicator 31: Sealing member 40: Adsorption material 41: Rib 50: Filter element 51: Filter medium 52, 53: Plate 60: Separation wall 61: Side view 62: Mounting part

Claims

[Claim 1] A case having a cylindrical first side surface and a bottom surface covering one end of the first side surface, A head provided to cover the opening of the case, A filter element provided in the space formed by the case and the head, comprising a cylindrical filter medium and a first plate and a second plate that cover both ends of the filter medium, A cylindrical suction member provided on the inner circumferential surface of the first side surface, A separation wall having a cylindrical second side surface is provided between the filter material and the adsorption member, Equipped with, The head has an inlet into which the liquid to be filtered flows, an outlet into which the filtered liquid flows out, and a cylindrical portion communicating with the outlet. The first plate is provided on the cylindrical portion such that the hollow portion of the filter material and the hollow portion of the cylindrical portion are in communication with each other. The separation wall has its upper end provided on the first plate or the head. The hollow portion of the inlet and the space between the adsorption member and the separation wall are in communication. A gap is formed between the separation wall and the bottom surface of the case, and between the separation wall and the filter material. A filter device characterized by the following features. [Claim 2] The lower end of the separation wall is located near the lower end of the filter material. The filter device according to claim 1. [Claim 3] The inlet allows the liquid to flow in along the tangent at any position of the cylindrical portion. The filter device according to claim 1 or 2, characterized by the above. [Claim 4] The filter element has the separation wall, The separation wall is provided on the first plate, A second suction member is provided on the outer circumferential surface of the second side surface. The filter device according to any one of claims 1 to 3.

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