JP2011143371A - Filter element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter element for trapping water in a liquid to be filtered while suppressing the cost of a line where the liquid to be filtered is fluidized. <P>SOLUTION: The filter element 40 includes a filter medium 71 for filtering foreign matter I in an operating oil L and a water adsorption material 72 having a function of adsorbing and trapping water in the operating oil L. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique of a filter element that is provided in, for example, a hydraulic oil circulation circuit of a hydraulic engine and filters a liquid to be filtered such as hydraulic oil.

  Conventionally, hydraulic fluid circulates in the hydraulic fluid circulation circuit of a hydraulic machine. The hydraulic oil contains foreign substances such as dust in the process of circulation. For this reason, a filtration device is provided to filter dust in the hydraulic oil flowing through the hydraulic oil circulation circuit. The filter device includes a filter element including a filter medium. The filter element generally includes a filter main body formed in a tubular shape by folding a filter medium, and a frame that supports the filter main body. The frame includes a cylindrical inner cylinder that is accommodated inside the filter body, an outer cylinder that accommodates the filter body, and plates that support the inner cylinder, the outer cylinder, and both ends of the filter body.

  A plurality of holes are formed in the inner cylinder and the outer cylinder. For this reason, the hydraulic oil to be filtered flows from the outer cylinder toward the inner side of the inner cylinder. At this time, foreign matters such as dust in the hydraulic oil are collected by the filter element. That is, the hydraulic oil is filtered (see, for example, Patent Document 1).

  On the other hand, the liquid to be filtered such as hydraulic oil may contain water in addition to foreign matters such as dust. This water also needs to be collected. For this reason, conventionally, for example, a circulation circuit for removing moisture is used for the purpose of collecting moisture. This water removal circulation circuit communicates with a tank for storing clean hydraulic oil filtered through a filtration device, and a water adsorbent is provided in the circuit. The moisture adsorbing material has a function of adsorbing only moisture in the hydraulic oil that passes through the moisture adsorbing material.

Japanese Patent No. 3492429

  However, as described above, if a water removal circulation circuit is provided separately from the hydraulic oil circulation circuit to collect moisture, the cost of the circuit through which the hydraulic oil circulates increases. That is, the cost increases. It is not preferable that the cost increases.

  An object of this invention is to provide the filter element which can collect the water | moisture content in the liquid which should be filtered, suppressing that the cost of the circuit through which the liquid which should be filtered flows becomes high.

  The filter element according to claim 1 of the present application includes a filter medium for filtering a liquid to be filtered, and a moisture adsorbing material having a function of adsorbing and collecting moisture in the liquid.

  A filter element according to a second aspect of the present invention is the filter element according to the first aspect, wherein the first filter element portion includes at least a first filter body in which the filter medium is formed in a cylindrical shape, and the moisture adsorbent. Includes a second filter element portion including at least a second filter body formed in a cylindrical shape. The first filter element portion and the second filter element portion are arranged in the respective axial directions, and the inside of the first filter body and the inside of the second filter body communicate with each other.

  The filter element according to claim 3 of the present application is the filter element according to claim 1, wherein the filter medium is formed in a cylindrical shape, and the moisture adsorbent is in a partial range in a circumferential direction of a side surface of the filter medium. Overlap and touch the entire surface of the area.

  The filter element according to claim 4 of the present application is the filter element according to claim 1, wherein the filter medium is formed in a cylindrical shape, and the moisture adsorbing material is formed in a cylindrical shape and is formed in the cylindrical shape inside. Accommodates the formed filter media.

  A filter element according to a fifth aspect of the present invention is the filter element according to the fourth aspect, wherein the moisture adsorbing material overlaps with the entire surface of the filter medium.

  The filter element according to the sixth aspect of the present invention is the filter element according to the fourth aspect, wherein the filter medium is formed into a cylindrical shape by being folded, and the moisture adsorbing material is formed into a cylindrical shape.

  ADVANTAGE OF THE INVENTION According to this invention, the filter element which can collect the water | moisture content in the liquid which should be filtered can be provided, suppressing that the cost of the circuit through which the liquid which should be filtered flows becomes high.

Sectional drawing which shows a filtration apparatus provided with the filter element which concerns on the 1st Embodiment of this invention. The perspective view which shows the filter element shown by FIG. Sectional drawing of the filter element shown along F3-F3 line shown in FIG. The perspective view which shows the edge parts of the 1st, 2nd part joined by the filter medium for joining shown by FIG. Sectional drawing which shows the state which cut | disconnected the filter element which concerns on the 2nd Embodiment of this invention so that the axial center line of a filter element may be perpendicularly crossed. The perspective view which shows the filter element which concerns on the 3rd Embodiment of this invention. Sectional drawing of the filter element which follows the F7-F7 line | wire shown in FIG. The perspective view which shows the filter element which concerns on the 4th Embodiment of this invention. Sectional drawing which shows a filtration apparatus provided with the filter element which concerns on the 5th Embodiment of this invention.

  A filter element according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a filtration device 10 including a filter element 40 of the present embodiment. As shown in FIG. 1, the filtration device 10 is incorporated in the hydraulic oil circulation circuit 5. The hydraulic oil circulation circuit 5 is provided in a device such as a heavy machine (not shown). In the hydraulic oil circulation circuit 5, hydraulic oil L is circulated. The filtering device 10 filters the hydraulic oil L circulating in the hydraulic oil circulation circuit 5. The hydraulic oil L that circulates through the hydraulic oil circulation circuit 5 and contains foreign matters such as dust inside is an example of the liquid to be filtered in the present invention.

  The filter device 10 communicates with the hydraulic oil circulation circuit 5, a base member 20 in which the hydraulic oil L flows, a filter case 30 fixed to the base member 20, and a filter defined inside the filter case 30 A filter element 40 provided in the accommodation space 31 and a lid member 78 are provided.

  The base member 20 includes an inlet 21 that guides the hydraulic oil L before being filtered into the filter housing space 31, and an outlet 22 that returns the filtered hydraulic oil L to the hydraulic oil circulation circuit 5.

  The filter case 30 includes a communication portion 32 that communicates with the inlet 21 and the outlet 22 of the base member 20, and an internal space defining member 33 that defines the filter housing space 31 described above. The communicating portion 32 is formed with a protruding threaded portion 34 that is threadedly engaged with the outlet 22 of the base member 20. A male thread is formed on the peripheral surface of the threaded portion 34. On the inner surface of the outlet port 22 of the base member 20, a female screw to which the male screw of the screwing portion 34 is screwed is formed. A communication hole 34 a penetrating the base member 20 is formed inside the screwing portion 34. In addition, a communication hole 35 that communicates with the inflow port 21 is formed in the communication portion 32.

  The internal space defining member 33 has a cylindrical shape and is open at one end and closed at the other end. The internal space defining member 33 is fixed with the edge 37 of the opening 36 in contact with the base member 20. Between the edge 37 of the opening 36 and the base member 20, a seal member 38 is formed over the entire circumferential direction of the opening 36. For this reason, the space between the edge 37 of the opening 36 and the base member 20 is sealed in a liquid-tight manner.

  In the communication portion 32, the periphery of the communication hole 35 is a protruding portion 39 that protrudes outward. The filter element 40 has a cylindrical shape, and the protrusion 39 is fitted inside. As a result, the filter element 40 is fixed to the base member 20. The filter element 40 will be described in detail later.

  A spring member 23 is provided between the internal space defining member 33 and the end of the filter element 40 (the end opposite to the communicating portion 32 in the figure). The spring member 23 is set so as to contract in a state where the internal space defining member 33 is fixed to the base member 20. For this reason, since the filter element 40 is pressed against the communicating portion 32 by the urging force of the spring member 23, the posture of the filter element 40 in the filter housing space 31 is maintained. The communication holes 34 a and 35 formed in the communication portion 32 are opened in the filter housing space 31. Therefore, the filter housing space 31 and the inflow port 21, and the filter housing space 31 and the outflow port 22 communicate with each other. Yes.

  Next, the filter element 40 will be specifically described. FIG. 2 is a perspective view showing the filter element 40. The filter element 40 shown in FIG. 1 is shown in a cross-sectional state. As shown in FIGS. 1 and 2, the filter element 40 includes a frame 50 and a filter body 70.

  As shown in FIG. 1, the frame 50 includes an inner cylinder 51, an outer cylinder 52, a first plate 53, and a second plate 54. The inner cylinder 51, the outer cylinder 52, the first plate 53, and the second plate 54 are made of resin, for example.

  The inner cylinder 51 is cylindrical. In the present embodiment, as an example, the inner cylinder 51 is a cylinder. One end 51 a of the inner cylinder 51 is connected and fixed to the first plate 53, and the other end 51 b of the inner cylinder 51 is connected to the second plate 54. The first and second plates 53 and 54 have communication holes 53a and 54a formed at portions corresponding to the inner side of the inner cylinder 51 so that the inner side and the outer side of the inner cylinder 51 communicate with each other. A plurality of communication holes 58 for communicating the inside and the outside are formed in the side wall portion 57 of the inner cylinder 51 over the entire area. The communication holes 58 are evenly distributed in the side wall portion 57. Note that only a part of the communication hole 58 is shown in the figure, and the others are omitted.

  The first and second plates 53, 54 are formed in a circular shape so as to spread outward from the edges of the openings of both ends 51 a, 51 b of the inner cylinder.

  The outer cylinder 52 has a cylindrical shape that is open at both ends, and is a cylinder as an example in the present embodiment. The outer cylinder 52 accommodates the inner cylinder 51 on the inner side and is arranged so as to be concentric with the inner cylinder 51 (so that the axis X of the inner cylinder 51 and the axis Y of the outer cylinder 52 overlap). ing. The edge of the opening at one end of the outer cylinder 52 is in contact with the first plate 53. The edge of the opening at the other end of the outer cylinder 52 is in contact with the second plate 54. A plurality of communication holes 60 for communicating the inside and the outside of the outer cylinder 52 are formed in the entire region of the side wall portion 59 of the outer cylinder 52. The communication holes 60 are uniformly distributed on the side wall portion 59. In FIG. 2, the outer cylinder 52 is shown with a part thereof omitted to show the internal structure. The outer cylinder 52 is actually formed in an annular shape in the circumferential direction. Further, a part of the communication hole 60 is illustrated, and the other is omitted.

  On the peripheral edges of the first and second plates 53, 54, rising portions 61, 62 rising inward are formed. The outer cylinder 52 is in contact with the rising portions 61 and 62 and is positioned.

  The filter body 70 includes a sheet-shaped filter medium 71 and a sheet-shaped moisture adsorbent 72. FIG. 3 is a cross-sectional view of the filter element 40 shown along line F3-F3 shown in FIG. FIG. 3 shows a state in which the filter element 40 is cross-sectioned so as to cross the axial center line Z vertically. Note that the axial lines X, Y, and Z overlap.

  As shown in FIG. 3, the filter medium 71 is formed in a cylindrical shape by being folded. By passing the hydraulic oil L to be filtered through the filter medium 71 in the thickness direction of the filter medium 71 (the direction indicated by the arrow A in the drawing, in other words, the direction from the outside to the inside or the direction from the outside to the inside). Then, foreign matter I such as dust in the hydraulic oil L is collected. As a result, the hydraulic oil L is filtered.

  The moisture adsorbing material 72 has a function of adsorbing and collecting water in the hydraulic oil L. The moisture adsorbing material 72 is overlapped in a state in which it partially contacts the circumferential direction of the outer peripheral surface 73 of the filter medium 71 (the surface facing the outside of the filter medium 71 formed in a cylindrical shape). The moisture adsorbing material 72 may be any material (material) having a function of adsorbing and collecting water in the hydraulic oil L as described above.

  More specifically, the entire surface of the moisture adsorbing material 72 is overlapped in contact with the outer surface 73 of the filter medium 71, and is folded with the filter medium 71. By being folded in this way, the moisture adsorbing material 72 is held by the filter medium 71.

  In the present embodiment, as an example, the range B in which the moisture adsorbing material 72 is provided is a range of 90 degrees in the circumferential direction of the filter medium 71. Note that the range in which the moisture adsorbent 72 is overlapped with the filter medium 71 is not limited to 90 degrees. For example, other angles such as 60 degrees and 120 degrees may be used. The range in which the moisture adsorbing material 72 is brought into contact with each other is set according to the moisture adsorption capacity required for the filter element 40.

  In the range B, the moisture adsorbing material 72 is in contact with the entire outer surface 73 of the filter medium 71 along the axis Z. In other words, in the range B, the moisture adsorbent 72 is in contact with the outer surface 73 of the filter medium 71 from one end to the other end of the filter medium 71 formed in a cylindrical shape.

  In FIG. 3, a range F3 surrounded by a two-dot chain line of the filter element 40 is shown enlarged. A range F3 shows a fixed structure of the filter medium 71 and the moisture adsorbing material 72. As shown in the range F3, the filter medium 71 is separated from a portion within the range B and a portion other than the range B, and these are integrally connected. Here, in the filter medium 71, a portion within the range B is a first portion 74, and a portion outside the range B is a second portion 75.

  The moisture adsorbing material 72 is stacked in contact with the entire surface of the first portion 74, and both are folded. In the first portion 74 and the second portion 75, end portions 74 a and 75 a that are adjacent to each other in the circumferential direction are connected to each other by being sandwiched between the joining clips 76. The clip 76 is metallic as an example. FIG. 4 is a perspective view showing end portions 74a and 75a that are sandwiched and connected by a clip 76 for joining.

  More specifically, as shown in FIGS. 3 and 4, the end portions 74 a and 75 a are in contact with each other on the outer side, and the contacted portion is connected to the moisture adsorbing material by the joining clip 76. 72 is also inserted and connected to each other. The end portions 74a and 75a may be joined with an adhesive, for example.

  In addition, in the range F3 of FIG. 3, although one joining structure is shown among the joining structures of the 1st part 74 and the 2nd part 75, the other junction part 77 is also the same.

  The filter body 70, which is a unit in which the filter medium 71 and the moisture adsorbent 72 are integrated, is disposed between the inner cylinder 51 and the outer cylinder 52 of the frame 50 so as to be concentric with the inner cylinder 51 and the outer cylinder 52. Is done. The inner cylinder 51 has a function of supporting the filter body 70 so that the filter body 70 is not excessively deformed inward when the hydraulic oil L passes through the filter body 70 in the thickness direction A. The outer cylinder 52 has a function of supporting the filter main body 70 so that it does not open excessively (not to be deformed).

  In the present embodiment, the structure in which the filter element 40 includes the inner cylinder 51 and the outer cylinder 52 is adopted. However, when the filter main body 70 is not excessively deformed inward, the inner cylinder 51 is used. It does not have to be done. Similarly, when the filter body 70 is not excessively deformed to the outside, the outer cylinder 52 may not be used.

  As shown in FIG. 1, the lid member 78 liquid-tightly blocks the communication hole 54 a of the second plate 54 and receives the spring member 23.

  Next, the operation of the filtration device 10 will be described. The hydraulic oil L that circulates in the hydraulic oil circulation circuit 5 includes foreign substances such as dust during the circulation. In addition, the hydraulic oil L originally contains water or water in the process of circulating through the hydraulic oil circulation circuit 5. The hydraulic oil L that has flowed into the filter housing space 31 from the base member 20 is still in a state before filtration and moisture removal by the filter element 40.

  The hydraulic oil L that has flowed into the filter housing space 31 passes through the filter element 40 from the outside toward the inside in the thickness direction, as indicated by arrows in the drawing. At this time, the hydraulic oil L passing through the first portion 74 of the filter medium 71 first passes through the moisture adsorbent 72. The moisture adsorbing material 72 adsorbs and collects the moisture W in the hydraulic oil L. For this reason, the water W in the hydraulic oil L that has passed through the water adsorbent 72 is removed. Next, the hydraulic oil L that has passed through the moisture adsorbent 72 passes through the first portion 74. At this time, foreign matters such as dust are removed by the filter medium 71. That is, the hydraulic oil L is filtered.

  Foreign matter such as dust is removed from the hydraulic oil L passing through the second portion 75 by the filter medium 71.

  Thus, the hydraulic oil L passes through the filtration device 10 many times in the process of circulating through the hydraulic oil circulation circuit 5. At this time, the moisture in the hydraulic oil L is gradually removed together with the foreign matter I such as dust.

  That is, it is not necessary to separately provide a moisture removal circulation circuit for removing moisture in the hydraulic oil L. In other words, moisture can be removed at the same time using a filtration device that filters foreign matter such as dust. This eliminates the need for a separate water removal circulation circuit for removing the water in the hydraulic oil L, thereby suppressing an increase in the cost of the circuit through which the hydraulic oil L circulates. Can remove moisture.

  In the present embodiment, the first portion 74 and the second portion 75 are made of the same material and have the same filtration accuracy. However, the first portion 74 and the second portion 75 may have different filtration accuracy. Alternatively, when the first and second portions 74 and 75 are made of the same material and have the same filtration accuracy, the filter medium 71 is formed into one sheet without being divided into the first and second portions 74 and 75. May be.

  Next, a filter element according to a second embodiment of the present invention will be described with reference to FIG. In addition, the structure which has the same function as 1st Embodiment attaches | subjects the code | symbol same as 1st Embodiment, and abbreviate | omits description. In the present embodiment, the structure of the filter body 70 is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The effect by the said different structure is demonstrated.

  FIG. 5 is a cross-sectional view showing a state in which the filter element 40 of the present embodiment is cut so as to cross the axial center line Z in the same manner as in FIG. As shown in FIG. 5, in this embodiment, the filter medium 71 is not divided into first and second portions 74 and 75, and a single sheet-like material is folded and formed into a cylindrical shape. . In FIG. 5, a range F5 surrounded by a two-dot chain line indicating a part of the filter element 40 is enlarged. The moisture adsorbing material 72 is stacked in contact with the entire outer peripheral surface of the filter medium 71 and is folded together with the filter medium 71. In this embodiment, the shape of the filter medium 71 and the shape of the moisture adsorbent 72 are different from those of the first embodiment. However, the material and filter performance of the filter medium 71 and the material of the moisture adsorbent 72 and the moisture adsorption performance are different. Etc. may be the same as in the first embodiment. The different structure will be specifically described.

  In the present embodiment, the same effect as in the first embodiment can be obtained, and furthermore, the moisture adsorbing material 72 is provided over the entire outer peripheral surface of the filter medium 71, so that the moisture in the hydraulic oil L can be more effectively obtained. Can be removed.

  Next, a filter element according to a third embodiment of the present invention will be described with reference to FIG. In addition, the structure which has the same function as 1st Embodiment attaches | subjects the code | symbol same as 1st Embodiment, and abbreviate | omits description. In the present embodiment, the structure of the filter body 70 is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The different structure will be specifically described.

  FIG. 6 is a perspective view showing the filter element 40 of the present embodiment. In FIG. 6, the outer cylinder 52 is omitted to show the filter main body 70. However, in the present embodiment, the filter element 40 actually includes the outer cylinder 52. FIG. 7 is a cross-sectional view of the filter element 40 taken along line F7-F7 shown in FIG. FIG. 7 is a cross section of the filter element 40 so as to cross the axial center line Z vertically.

  As shown in FIG. 7, in this embodiment, the filter medium 71 is not divided into first and second portions 74 and 75, but a single sheet is folded and formed into a cylindrical shape. Yes. The moisture adsorbing material 72 is rounded into a cylindrical shape, and contains the filter medium 71 inside. In FIG. 7, a range F <b> 7 surrounded by a two-dot chain line that is a part of the vicinity of the moisture adsorbent 72 in the filter element 40 is shown in an enlarged manner. As shown in the figure, in the present embodiment, the moisture adsorbing material 72 is not superimposed on the filter medium 71 as in the first embodiment. Furthermore, the inner end 72a of the cylindrical moisture adsorbing material 72 is formed in a cylindrical shape so that the protruding end portion 71a of the filter medium 71 that is folded and protrudes to the outside comes into contact.

  As shown in FIG. 6, the moisture adsorbing material 72 is formed not in the whole area but in a part in the axial center line Z direction. In the present embodiment, as an example, the moisture adsorbing material 72 is disposed at the center in the axis Z direction. In this embodiment, the shape of the filter medium 71 and the shape of the moisture adsorbent 72 are different from those of the first embodiment, but the material of the filter medium 71 and the filtration performance, the material of the moisture adsorbent 72, the moisture adsorption performance, and the like. May be the same as in the first embodiment. The effect by the said different structure is demonstrated.

  This embodiment can obtain the same effects as those of the first embodiment.

  Next, a filter element according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the structure which has the same function as 3rd Embodiment attaches | subjects the same code | symbol as 3rd Embodiment, and abbreviate | omits description. In the present embodiment, the structure of the moisture adsorbing material 72 is different from that of the third embodiment. Other structures may be the same as those of the third embodiment. The different structure will be specifically described.

  FIG. 8 is a perspective view showing the filter element 40 of the present embodiment. In FIG. 8, the outer cylinder 52 is omitted to show the filter main body 70. However, in the present embodiment, the filter element 40 actually includes the outer cylinder 52. As shown in FIG. 8, in this embodiment, the moisture adsorbent 72 is formed so as to cover the entire area of the filter medium 71 along the axial center line of the filter medium 71. That is, the moisture adsorbing material 72 extends from one end of the filter medium 71 to the other end. In the drawing, in order to show the filter medium 71, a part of the moisture adsorbing material 72 is notched.

  In the present embodiment, the same effect as in the third embodiment can be obtained.

  Next, a filter element according to a fifth embodiment of the present invention will be described with reference to FIG. In addition, the structure which has the same function as 1st Embodiment attaches | subjects the code | symbol same as 1st Embodiment, and abbreviate | omits description. In the present embodiment, the structure of the filtration device 10 is different from that of the first embodiment. The different structure will be specifically described.

  FIG. 9 is a cross-sectional view showing the filtration device 10 in which the filter element 40 of the present embodiment is installed. As shown in FIG. 9, the filtration device 10 of the present embodiment does not include the base member 20 and the filter case 30 as in the first embodiment.

  In the present embodiment, the filtration device 10 includes a tank 80 provided in the hydraulic oil circulation circuit 5 and a filter element 40 accommodated in the tank 80.

  The tank 80 includes a tank body 81 and a lid member 82. The tank body 81 has a cylindrical shape with one end opened. The side wall 83 of the tank body 81 is formed with an inflow port 84 into which the hydraulic oil L before being filtered flows. An outlet 86 for returning the hydraulic oil L after passing through the filter element 40 to the hydraulic oil circulation circuit 5 is formed in the bottom wall portion 85 of the tank body 81.

  The edge of the outflow port 86 or the vicinity of the edge protrudes into the tank body 81. In the present embodiment, as an example, a part of the pipe portion 200 constituting the hydraulic oil circulation circuit 5 protrudes into the tank body 81 from the outlet 86. The pipe part 200 is cylindrical.

  The pipe part 200 is fitted to the outlet 86, and therefore the gap between the edge of the outlet 86 and the pipe part 200 is sealed in a liquid-tight manner. The structure is not limited to this. In the present embodiment, the pipe portion 200 protrudes into the tank main body 81 as an example of the vicinity of the edge of the outlet 86. For example, the edge of the outlet 86 may protrude toward the inside of the tank body 81.

  The filter element 40 includes a first filter element portion 90 and a second filter element portion 91.

  The first filter element unit 90 includes a frame 50 and a moisture adsorbing material 72. The frame 50 may be the same as the frame 50 described in the first embodiment. The moisture adsorbing material 72 has a sheet shape and is wound around the inner cylinder 51 between the inner cylinder 51 and the outer cylinder 52. A first filter body 300 is formed by forming the moisture adsorbing material 72 into a cylindrical shape. The first filter main body 300 is an example of the first filter main body referred to in the present invention.

  The first filter element portion 90 is positioned in the tank main body 81 by fitting the outflow port 86 into the communication hole 53 a of the first plate 53 of the first filter element portion 90. By fitting as described above, the space between the pipe part 200 and the edge of the communication hole 53a is liquid-tightly closed.

  The second filter element portion 91 includes a frame 50 and a filter medium 71. The frame 50 may be the same as the frame 50 described in the first embodiment, but the structure of the first and second plates 53 and 54 is different from that of the first embodiment. This different part will be described. In the first plate 53 of the second filter element portion 91, the peripheral edge portion 53 b of the communication hole 53 a protrudes outward along the axis X of the inner cylinder 51. The communication hole 54a of the second plate 54 is liquid-tightly closed. The filter medium 71 is folded and formed into a cylindrical shape, and is accommodated between the inner cylinder 51 and the outer cylinder 52 so as to be concentric with the inner cylinder 51. A filter body 71 formed in a cylindrical shape is a second filter body 301. The 2nd filter main body 301 is an example of the 2nd filter main body said by this invention.

  The second filter element portion 91 is configured such that the edge portion 53 b that protrudes outside the first plate 53 is fitted into the communication hole 54 a of the second plate 54 of the first filter element portion 90, whereby the tank body 81. Positioned within. In other words, the first and second filter element portions 90 and 91 are arranged in the directions 203 and 204 in which the respective axis lines 201 and 202 extend. Thus, the insides of the first and second filter element portions 90 and 91 communicate with each other. This is an example in which the insides of the first and second filter bodies referred to in the present invention communicate with each other.

  The communication hole 54a of the second plate 54 of the first filter element part 90 and the protruding edge part 53b of the first plate 53 of the second filter element part 91 are such that the edge part 53b is connected to the communication hole 54a. It is formed to fit closely. As a result, since the space between the edge of the communication hole 54a and the edge portion 53b is liquid-tightly sealed, when the hydraulic oil L flows from the second filter element portion 91 to the first filter element portion 90, The hydraulic fluid leaks from the communication hole 54a of the second plate 54 of the first filter element part 90, or the second plate 54 of the first filter element part 90 without passing through the second filter element part 91. The hydraulic oil L is prevented from flowing into the first filter element portion 90 from the communication hole 54a.

  The lid member 82 is fixed to the edge 88 of the opening 87 of the tank body 81 by a bolt 100 so as to be opened and closed. The edge 88 is formed over the entire circumference of the opening 87, for example, in a flange shape. As a result, the lid member 82 closes the opening 87. An O-ring 101 is provided between the edge 88 and the lid member 82 as an example of a seal member. When the lid member 82 closes the opening 87 and is fixed with the bolt 100 by the O-ring 101, the gap between the lid member 82 and the edge portion 88 is liquid-tightly sealed.

  A spring member 102 is provided between the lid member 82 and the second filter element portion 91. In a state where the lid member 82 closes the opening 87, the spring member 102 contracts and the first and second filter element portions 90 and 91 are pressed by the urging force of the spring member 102. As a result, the postures of the first and second filter element portions 90 and 91 are maintained.

  Below, operation | movement of the filtration apparatus 10 of this embodiment is demonstrated. The hydraulic oil L before being filtered flows into the tank 80 through the inlet 84. The hydraulic oil L accumulated in the tank 80 passes through the first and second filter element portions 90 and 91 from the outside toward the inside. Moisture is removed from the hydraulic oil L passing through the first filter element portion 90 by the moisture adsorbent 72. The hydraulic oil L that has passed through the moisture adsorbing material 72 flows into the inner cylinder 51, and then returns to the hydraulic oil circulation circuit 5 through the outlet 86.

  Foreign matter such as dust is removed from the hydraulic oil L passing through the second filter element portion 91 by the filter medium 71. The hydraulic oil L that has passed through the second filter element portion 91 passes through the communication hole 53a of the first plate 53 and the communication hole 54a of the second plate 54 of the first filter element portion 90, so that the first It flows into the inner cylinder 51 of the filter element portion 90.

  In the present embodiment, the filter element 40 includes the first filter element portion 90 including the moisture adsorbing material 72, whereby the moisture can be removed at the same time as the foreign matter I such as dust is filtered. For this reason, since it is not necessary to provide a circulation circuit for removing moisture separately from the filtering device 10, the same effect as in the first embodiment can be obtained.

  In the present embodiment, a structure including a frame 50 is used as an example of the first and second filter element portions. However, for example, when the first and second filter bodies 300 and 301 in which the filter medium 71 and the moisture adsorbing material 72 are formed in a cylindrical shape have sufficient strength and the frame 50 is not necessary, The filter element portions 1 and 2 do not have to include a frame.

  In this case, the first and second filter bodies 300 and 301 in which the filter medium 71 and the moisture adsorbing material 72 are formed in a cylindrical shape are the first and second filter element portions referred to in the present invention. Further, in this case, the first and second filter bodies (first and second filter element portions) may be communicated with each other, for example, by being overlapped with each other in the axial direction.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

  DESCRIPTION OF SYMBOLS 40 ... Filter element, 71 ... Filter material, 72 ... Water | moisture-content adsorption material, 90 ... 1st filter element part, 91 ... 2nd filter element part, 203 ... Axial direction, 204 ... Axial direction, 300 ... 1st filter part , 301, second filter section, L, hydraulic oil (liquid to be filtered), B, range.

Claims (6)

A filter medium for filtering the liquid to be filtered;
A filter element comprising: a moisture adsorbent having a function of adsorbing and collecting moisture in the liquid. A first filter element portion including at least a first filter body in which the filter medium is formed in a cylindrical shape;
A second filter element portion comprising at least a second filter body in which the moisture adsorbing material is formed in a cylindrical shape,
The first filter element portion and the second filter element portion are arranged in the respective axial directions, and the inside of the first filter body and the inside of the second filter body are communicated with each other. The filter element according to claim 1. The filter medium is formed in a cylindrical shape,
The filter element according to claim 1, wherein the moisture adsorbing material overlaps a partial range in a circumferential direction of a side surface of the filter medium and contacts the entire surface of the range. The filter medium is formed in a cylindrical shape,
The filter element according to claim 1, wherein the moisture adsorbing material is formed in a cylindrical shape and accommodates the filtering material formed in the cylindrical shape inside.   The filter element according to claim 4, wherein the moisture adsorbing material overlaps with the entire surface of the filter medium in contact with the filter element. The filter medium is folded and formed into a cylindrical shape,
The filter element according to claim 4, wherein the moisture adsorbent is formed in a cylindrical shape.

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