JP2017196552A - Filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly open a valve when a cartridge is exchanged.SOLUTION: When a cartridge is inserted in the inside of a filter case, a first surface of a first cover member and a third surface of a third cover member which have complementary shapes abut on each other, and a second surface of a second cover member and a fourth surface of a fourth cover member abut on each other, so that the cartridge presses a platy member against the energizing of a third compression spring, and the third cover member and the forth cover member press the first cover member and the second cover member against the energizing force of the first compression spring and the second compression spring. Consequently, a first hole and a second hole formed on the cartridge are respectively coupled with a third hole and a fourth hole formed on a filter case, and the first cover member to the fourth cover member do not cover the first hole to the fourth hole, and an inner space of the cartridge and an inner space of the filter case are communicated with each other.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a filter device.

  In Patent Document 1, a head having a capsule mounting portion having an introduction port and a discharge port, an introduction port that can be inserted into and removed from the capsule mounting portion, and that is connected to the introduction port and the discharge port of the head are introduced. A tank-shaped capsule filter having a built-in filter medium for filtering the liquid flowing from the inlet to the outlet, and setting the capsule filter in the capsule mounting portion of the head. A capsule-type filter device for liquid comprising a self-closing valve that opens an outlet is disclosed.

JP-A-6-327900

  However, in the invention described in Patent Document 1, since the valve rods are brought into contact with each other when the valve is opened, the valve rods do not make good contact with each other or the valve rods are bent. May not open well.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a filter device that can reliably open and close a valve when a cartridge is replaced.

  In order to solve the above problems, a filter device according to the present invention includes, for example, a cartridge having a substantially cylindrical filter medium and a valve receiving member provided on an end surface of the filter medium, and a cylinder in which the cartridge is provided. And a filter case having a head on which the cartridge is mounted. The valve receiving member is filtered by the filter medium with a substantially cylindrical first hole through which oil flows into the filter medium. A second hole through which filtered oil that is filtered oil flows out is formed, and the valve receiving member is inserted into the first hole so as to close the first hole, and has a substantially disc-shaped first insertion. A first cover member including a first cover member, a first compression spring that disposes the first cover member at a position where the first insertion portion closes the first hole, and an interior of the second hole. A circle inserted into the second hole to close the second hole A second cover member having a second cover member having a shape, and a second compression spring having the second cover member disposed at a position where the second insert member closes the second hole. A plate-like member provided in the head, wherein a third hole having a diameter equal to or larger than the diameter of the first hole and a fourth hole having a diameter equal to or larger than the diameter of the second hole are formed; A third cover member having a substantially disc-shaped third insertion portion inserted into the inside of the fourth hole, a fourth cover member having a substantially disc-shaped fourth insertion portion to be inserted into the fourth hole, A force in a direction away from the head is applied to the plate-like member so that the third insertion portion closes the third hole and the fourth insertion portion closes the fourth hole. A third compression spring to be disposed, the first surface of the first cover member and the third surface of the third cover member One is a convex shape, the other is a concave shape complementary to the convex shape, and one of the second surface of the second cover member and the fourth surface of the fourth cover member is convex. And the other is a concave shape complementary to the convex shape, the cartridge is inserted into the filter case, the first surface and the third surface abut, and the second When the plate member is pressed by the cartridge against the urging force of the third compression spring, the surface and the fourth surface abut against the urging force of the first compression spring. Three cover members press the first cover member, the fourth cover member presses the second cover member against the urging force of the second compression spring, and the cartridge is mounted on the head. And the first hole and the third hole are connected, and the second hole The fourth hole is connected, and the internal space of the cartridge communicates with the internal space of the filter case.

  According to the filter device of the present invention, when the cartridge is inserted into the filter case, the first surface of the first cover member and the third surface of the third cover member having a complementary shape come into contact with each other, and The second surface of the second cover member and the fourth surface of the fourth cover member come into contact with each other, and the cartridge presses the plate-shaped member against the urging force of the third compression spring, and the third cover member and the fourth cover The member presses the first cover member and the second cover member against the urging force of the first compression spring and the second compression spring. As a result, the first hole and the second hole formed in the cartridge are connected to the third hole and the fourth hole formed in the filter case, respectively, and the first cover member to the fourth cover member are connected to the first hole. The fourth hole is not covered (the valve is open), and the internal space of the cartridge communicates with the internal space of the filter case. Since the valve is opened by bringing two surfaces having complementary shapes into contact with each other, the valve can be reliably opened when the cartridge is set in the filter case. Further, while applying a force to the third compression spring (shrinking the third compression spring) and applying a force to the first compression spring and the second compression spring (shrinking the first compression spring and the second compression spring), When the length of the three compression springs returns to the original length, the lengths of the first compression spring and the second compression spring also return to the original at the same time. Therefore, when removing the cartridge from the filter case, the valve can be reliably closed. Thus, the valve can be reliably opened and closed when the cartridge is replaced.

  Further, according to the filter device of the present invention, the first surface and the third surface are complementary shapes, and the second surface and the fourth surface are complementary shapes. And the second surface and the fourth surface contact. Accordingly, when the filter device is used, liquid such as hydraulic oil does not adhere to the first surface, the second surface, the third surface, and the fourth surface. Therefore, it is possible to prevent the hydraulic oil from dripping from the cartridge when the cartridge is replaced.

  Here, the first surface and the second surface may have a generally truncated conical concave shape, and the third surface and the fourth surface may have a generally frustoconical convex shape. Thereby, when inserting a cartridge in a filter case, a 1st surface and a 3rd surface and a 2nd surface and a 4th surface can be made to contact | abut reliably. Further, the third cover member and the fourth cover member can reliably push up the first cover member and the second cover member against the urging force of the first compression spring and the second compression spring.

  Here, seal members that contact the inner peripheral surfaces of the first hole and the second hole may be provided on the outer peripheral surfaces of the first cover member and the second cover member, respectively. As a result, when the cartridge is exchanged, the liquid remaining inside the cartridge can be confined in the cartridge, and the hydraulic oil can be prevented from dripping from the cartridge.

  According to the present invention, the valve can be reliably opened and closed when the cartridge is replaced.

It is a disassembled perspective view which shows the outline of the filter apparatus 1 which is one Embodiment of this invention. FIG. 2 is a cross-sectional view schematically showing the filter device 1 and shows a state before the cartridge 20 is mounted on the head 32. 4 is a partially enlarged cross-sectional view of the filter device 1 in a state before the cartridge 20 is mounted on the head 32. FIG. 3 is a partially enlarged cross-sectional view of the filter device 1 in a state where the cartridge 20 is mounted on a head 32. FIG. FIG. 2 is a cross-sectional view schematically showing the filter device 1 and shows a state where the cartridge 20 is mounted on a head 32.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing an outline of a filter device 1 according to a first embodiment of the present invention.

  The filter device 1 mainly includes a cover 10, a cartridge 20, and a filter case 30. The filter device 1 is a filter device used in, for example, hydraulic equipment. The filter case 30 is attached to a pipe or the like of a hydraulic device. When the filter case 30 is used for a predetermined period, the used cartridge 20 is taken out from the filter case 30 and replaced with a new cartridge 20. In addition, although the filter apparatus 1 of this Embodiment filters oil, the filter apparatus of this invention can filter various liquids, such as oil and water.

  FIG. 2 is a cross-sectional view schematically showing the filter device 1, and shows a state before the cartridge 20 is mounted on the head 32. In addition, illustration of the cover 10 is abbreviate | omitted in FIG. Further, in FIG. 2, a part of hatching indicating a cross section is omitted.

  The cartridge 20 mainly includes a filter medium 21, a handle portion 22, an outer cylinder 23, and a valve receiving member 24.

  The filter medium 21 has a substantially hollow cylindrical shape having a thickness in the radial direction. The filter medium 21 is formed by fold-folding a sheet-like filter paper using synthetic resin, paper, or the like, and connecting both ends of the fold-folded filter paper and rounding it into a cylindrical shape.

  The outer cylinder 23 is a substantially hollow cylindrical member formed using a highly corrosion-resistant material (resin or metal). The outer cylinder 23 is provided outside the filter medium 21.

  A handle 22 is provided at one end (upper end) of the filter medium 21 and the outer cylinder 23. The handle portion 22 is fixed to the filter medium 21 and the outer cylinder 23 so as to cover the upper ends of the filter medium 21 and the outer cylinder 23. The handle portion 22 has a role as a lid of the cartridge 20, and a grip portion 22 a is formed so as to protrude upward (+ z direction). The grip portion 22 a is a member for the operator to grip the cartridge 20.

  A valve receiving member 24 is provided at the other end (lower end) of the filter medium 21 and the outer cylinder 23. The valve receiving member 24 is a substantially cylindrical member, and is formed using a material (resin or metal) having high corrosion resistance.

  FIG. 3 is a partially enlarged cross-sectional view of the filter device 1 in a state before the cartridge 20 is mounted on the head 32. In FIG. 3, hatching indicating a cross section is partially omitted.

  The valve receiving member 24 mainly has an inner cylinder part 24a, a plate-like part 24b, and an outer cylinder part 24c. The front end of the inner cylinder part 24a is fitted to the inner peripheral surface of the plate 21a provided at the end part of the filter medium 21, and the outer cylinder 23 is fitted to the groove 24d formed at the front end of the outer cylinder part 24c. The filter medium 21, the outer cylinder 23, and the valve receiving member 24 are integrated.

  Substantially cylindrical holes 24e and 24f are formed in the plate-like portion 24b. The hole 24e is an oil introduction port through which dirty oil (oil before filtration) that has not been filtered flows into the filter medium 21, and the hole 24f is oil through which oil filtered through the filter medium 21 (oil after filtration) flows out. This is the outlet. The hole 24e is connected to the inflow space S3, and the hole 24f is connected to the outflow space S4.

  A valve 40 is provided in each of the holes 24e and 24f. The valve 40 includes a cover member 41 that closes the hole 24e and the hole 24f by being inserted into the hole 24e and the hole 24f, and a compression spring 42 that biases the cover member 41 with a force.

  The cover member 41 includes a substantially disc-shaped insertion portion 41a inserted into the holes 24e and 24f, and a flange portion 41b provided on the surface (+ z side surface) of the insertion portion 41a. The flange portion 41b is plate-shaped and has an outer diameter larger than the inner diameters of the holes 24e and 24f.

  The insertion portion 41a has a substantially cylindrical shape, and the outer diameter is substantially the same as the inner diameter of the holes 24e and 24f. A groove 41c is formed on the outer periphery of the insertion portion 41a, and a seal member (for example, an O-ring) 55 is provided in the groove 41c. The back surface (the surface on the -z side) 41d of the insertion portion 41a has a concave shape with a substantially truncated cone as a whole.

  The compression spring 42 is, for example, a coil spring, and one end is provided on the bottom bottom side (projection 24g) of the inner cylinder portion 24a, and the other end is provided on the cover member 41 (projection 41e formed on the surface of the flange portion 41b). Provided. Therefore, the compression spring 42 urges the cover member 41 with a force in the −z direction.

  When the force in the −z direction is urged by the compression spring 42, the insertion portion 41a is inserted into the hole 24e or the hole 24f to close the hole 24e or the hole 24f, and the flange portion 41b is in a position where it abuts the plate-like portion 24b. A cover member 41 is disposed. This state is a state in which the valve 40 is closed.

  Returning to the description of FIG. The filter case 30 mainly includes a cylindrical portion 31 in which the cartridge 20 is provided, and a head 32 to which the cartridge 20 is mounted.

  The cylindrical part 31 is a substantially cylindrical member, and is formed of metal or resin. A flange portion 31 a for attaching to a pipe or the like is formed at the upper end (+ z side) of the cylindrical portion 31. The cartridge 20 is inserted from the opening at the upper end of the cylindrical portion 31. When the cartridge 20 is inserted, the opening at the upper end of the cylindrical portion 31 is covered with the cover 10 (not shown in FIG. 2).

  The lower (−z side) open end of the cylindrical portion 31 is attached to the head 32. The head 32 is a substantially cylindrical member and is made of metal. The filter case 30 is assembled by connecting the upper opening end of the head 32 and the lower opening end of the cylindrical portion 31, and a space into which the cartridge 20 is inserted is formed inside the filter case 30. The

  The head 32 will be described with reference to FIG. The head 32 mainly filters a case 32a having a hole in the bottom surface, an inflow space S1 for allowing the oil before filtration to flow into the cartridge 20 through the inside of the case 32a, and the filtered oil that has flowed out of the cartridge 20 It has an outflow space S2 that flows out of the apparatus 1 and a main body 32b that is divided.

  On the side surface of the case 32a, an inflow port 32c that guides oil before filtration to the inflow space S1 is formed. A hole 32d is formed in the bottom surface of the case 32a, and a discharge pipe 33 communicating with the outflow space S2 is provided in the hole 32d. The discharge pipe 33 is provided so as to cover the valve 34 provided in the main body 32b. The valve 34 opens and closes according to the difference between the pressure in the inflow space S1 and the pressure in the external space of the filter case 30. Since the valve 34 is well-known, detailed description is abbreviate | omitted.

  A seal member 50 (for example, an O-ring) is provided between the tubular portion 31 and the head 32. By the seal member 50, the liquid is sealed from between the tubular portion 31 and the head 32 so as not to leak to the outside.

  Further, the filter case 30 includes a plate 35 and a compression spring 36. One end of the compression spring 36 is provided on the back surface of the plate 35, and the other end is provided on the surface of the main body portion 32 b, and biases an upward (+ z direction) force to the plate 35. Therefore, the plate 35 is disposed at a position separated from the main body portion 32 b by the natural length of the compression spring 36.

  The plate 35 includes a substantially plate-shaped main body portion 35a and a cylindrical portion 35b formed to protrude upward from the main body portion 35a. A groove 35c is formed on the outer peripheral surface of the main body 35a, and a seal member 51 (for example, an O-ring) is provided in the groove 35c. The sealing member 51 is sealed so that liquid does not leak from between the cylindrical portion 31 and the main body portion 35a.

  The plate 35 is formed with holes 35d and 35e penetrating the main body 35a in the plate pressure direction. The hole 35d is an oil inlet through which oil before filtration passes, and the hole 35e is an oil outlet through which oil after filtration passes. The diameter of the hole 35d is substantially the same as the diameter of the hole 24e, and the diameter of the hole 35e is substantially the same as the diameter of the hole 24f.

  The main body portion 35a is formed with a cylindrical portion 35f protruding in the −z direction. One opening of the cylindrical portion 35f is a hole 35d. The other opening of the cylindrical portion 35f is slidably provided inside the cylindrical portion 32f formed on the upper surface of the case 32a. The internal space of the cylindrical portion 32f and the cylindrical portion 35f is an inflow space S1, and the external space of the cylindrical portion 32f and the cylindrical portion 35f is an outflow space S2. The cylindrical portion 35f is thinner than the hole 35d.

  A sealing member 57 is provided on the outer periphery of the cylindrical portion 35f, and is sealed so that liquid does not leak from between the cylindrical portion 32f and the cylindrical portion 35f.

  In addition, a hole 35g narrower than the hole 35e is formed in the main body portion 35a as a lower hole of the hole 35e. The diameter of the hole 35g is substantially the same as the diameter of the cylindrical portion 35f.

  A cover member 45 is provided in each of the holes 35d and 35e. The cover member 45 is fixed to the main body portion 32b through the shaft 32e.

  The cover member 45 has a thick plate-like insertion portion 45a that is inserted into the holes 35d and 35e. The insertion portion 45a has a substantially cylindrical shape, and the outer diameter is substantially the same as the inner diameter of the holes 35d and 35e. A groove 45c is formed on the outer periphery of the insertion portion 45a, and a seal member (for example, an O-ring) 56 is provided in the groove 45c.

  A protrusion 45d that is thinner than the insertion portion 45a is formed on the back surface of the insertion portion 45a. The shaft 32e is provided on the protrusion 45d. The protruding portion 45d is thinner than the cylindrical portion 35f and the hole 35g, and the insertion portion 45a is thicker than the cylindrical portion 35f and the hole 35g.

  The cover member 45 and the compression spring 36 constitute a valve 46. When the compression spring 36 pushes up the plate 35, the plate 35 is disposed at a position where the insertion portion 45a closes the holes 35d and 35e (a position where the protruding portion 45d is inserted into the cylindrical portion 35f or the hole 35g). At this time, the valve 46 is closed. When the valve 46 is closed, the seal member 56 seals the liquid so as not to leak between the insertion portion 45a and the holes 35d and 35e.

  The entire surface 45b of the insertion portion 45a is a convex shape having a substantially truncated cone shape. The front surface 45b and the back surface 41d have complementary shapes.

  Next, the assembly and operation of the filter device 1 formed in this way and the replacement of the cartridge 20 will be described.

  Before using the filter device 1, the cartridge 20 is set in the filter case 30. Specifically, first, as shown in FIGS. 1 and 2, the operator inserts the cartridge 20 through an opening formed at the upper end of the cylindrical portion 31. When the cartridge 20 is inserted as it is, the back surface 41d of the cover member 41 and the front surface 45b of the cover member 45 come into contact with each other, and the outer periphery of the plate-like portion 24b (seal member 52) and the cylindrical portion 35b are fitted.

  FIG. 4 is a partially enlarged cross-sectional view of the filter device 1 with the cartridge 20 mounted on the head 32. In FIG. 4, hatching indicating a cross section is partially omitted.

  Due to the load of the cartridge 20, the plate 35 is pressed against the urging force of the compression spring 36 while the back surface 41 d of the cover member 41 and the front surface 45 b of the cover member 45 are in contact with each other. As a result, the compression spring 36 is compressed, and the valve receiving member 24 and the plate 35 are pushed down (moves in the −z direction, see the thick arrow in FIG. 4).

  As a result, the cover member 41 is pressed and pushed up by the cover member 45 against the urging force of the compression spring 42 (moves in the + z direction, see the thick arrow in FIG. 4).

  Since the back surface 41d of the cover member 41 and the front surface 45b of the cover member 45 have a complementary shape, the entire back surface 41d is in contact with the entire front surface 45b. Therefore, the cover member 45 can reliably push up the cover member 41 against the urging force of the compression spring 42.

  When the cartridge 20 is mounted on the head 32, the plate-like portion 24b of the valve receiving member 24 is fitted into the cylindrical portion 35b of the plate 35, so that the hole 35d and the hole 24e come into contact with each other, and the hole 24f and the hole 35e contact each other. Touch. When the cover member 41 is pushed up, the hole 24e and the hole 35d are opened, and the inflow space S1 and the inflow space S3 communicate with each other. Moreover, the hole 24f and the hole 35e are opened, and the outflow space S2 and the outflow space S4 communicate with each other.

  When the cartridge 20 is set in the filter case 30, the filter device 1 can be used by covering the cover 10.

  FIG. 5 is a cross-sectional view schematically showing the filter device 1, and shows a state where the cartridge 20 is mounted on the head 32. In addition, illustration of the cover 10 is abbreviate | omitted in FIG. Further, in FIG. 5, a part of hatching indicating a cross section is omitted. In FIG. 5, an arrow indicated by a two-dot chain line indicates the flow of oil.

  The unfiltered oil that has flowed into the head 32 from the inflow port 32c passes through the cylindrical portion 32f and the cylindrical portion 35f, which are the inflow space S1, passes through the hole 35d and the hole 24e, flows out of the filter case 30, and It flows into the inflow space S3 of the cartridge 20. The unfiltered oil guided to the inflow space S3 is filtered by passing through the filter medium 21 from the outside to the inside, and is guided to the outflow space S4.

  The filtered oil passes through the hole 24f and the hole 35e, is discharged from the cartridge 20, and is guided to the outflow space S2 in the filter case 30. The filtered oil guided to the outflow space S2 passes through the discharge pipe 33 and is discharged to the outside of the filter device 1.

  Since the back surface 41d of the cover member 41 and the front surface 45b of the cover member 45 have a complementary shape, the entire back surface 41d is in contact with the entire front surface 45b. Therefore, even if the filter device 1 is used, the oil before filtration and the oil after filtration (hereinafter referred to as hydraulic oil) do not adhere to the back surface 41d.

  When used for a predetermined period, the used cartridge 20 is taken out from the filter case 30 and replaced with a new cartridge 20. First, the operator removes the cover 10, holds the holding part 22a, and pulls up the cartridge 20 in the + z direction. As a result, the load of the cartridge 20 is not applied, and the compression spring 36 returns to its original length, whereby the plate 35 and the valve receiving member 24 are pushed up. Accordingly, the cover member 41 is pushed down by the compression spring 42.

  As a result, as shown in FIG. 2, the cover member 41 closes the holes 24e and 24f (the valve 40 is closed), and the cover member 45 closes the holes 35d and 35e (the valve 46 is closed). Then, the contact between the back surface 41d of the cover member 41 and the surface 45b of the cover member 45 is released, the fitting between the plate-like portion 24b and the cylindrical portion 35b is released, and the cartridge 20 and the filter case 30 are separated.

  Since the valve 40 is closed, the hydraulic oil remaining in the cartridge 20 is trapped inside the cartridge 20. Further, since the valve 46 is closed, even if the cartridge 20 is taken out, dust does not enter the inside of the filter case 30 (inside the discharge pipe 33).

  When the cartridge 20 is taken out of the filter case 30, a new cartridge 20 is set in the filter case 30 according to the procedure already described.

  According to the present embodiment, when the valves 40 and 46 are opened, the back surface 41d of the cover member 41 and the front surface 45b of the cover member 45 are in contact with each other. Therefore, when the cartridge 20 is set in the filter case 30, the substantially disk-shaped cover member 45 can reliably push the substantially disk-shaped cover member 41 and open the valves 40 and 46.

  In the present embodiment, when the cartridge 20 is set in the filter case 30, a force is applied to the compression spring 36 while the compression spring 36 is contracted while a force is applied to the compression spring 42. In the opposite case, that is, when the length of the compression spring 36 tries to return to the original length, the length of the compression spring 42 also tries to return to the original length at the same time. Then, since the compression spring 36 pushes up the valve receiving member 24 together with the plate 35, when the compression spring 36 returns to the original length, the length of the compression spring 42 is also surely restored. Therefore, when removing the cartridge from the filter case, the valve can be reliably closed.

  Further, according to the present embodiment, the insertion portion 41a is provided in the holes 24e and 24f, and the gap between the insertion portion 41a and the holes 24e and 24f is provided by the seal member 55 provided on the outer periphery of the insertion portion 41a. Sealed. Therefore, it is possible to prevent the hydraulic oil from dripping from the cartridge 20 when the cartridge 20 is replaced.

  Further, according to the present embodiment, since the back surface 41d of the cover member 41 and the front surface 45b of the cover member 45 are complementary shapes, the entire back surface 41d abuts on the front surface 45b, and the filter device 1 is used. The hydraulic oil does not adhere to the back surface 41d. Therefore, it is possible to prevent the hydraulic oil from dripping from the cartridge 20 at the time of replacement work of the cartridge 20.

  In the present embodiment, the filter device 1 is provided in a hydraulic device or the like so that the −z direction is downward in the vertical direction, but the mounting posture of the filter device 1 is not limited to this. For example, you may attach the filter apparatus 1 to hydraulic equipment etc. so that a -z direction may turn sideways.

  In the present embodiment, the back surface 41d of the insertion portion 41a has a substantially truncated conical concave shape, and the surface 45b of the insertion portion 45a has a substantially truncated cone convex shape, but the back surface 41d has a substantially truncated cone convex shape. The surface 45b may have a substantially truncated conical concave shape. Moreover, although the back surface 41d and the surface 45b need to be a complementary shape, these shapes are not restricted to the convex shape and concave shape of a substantially truncated cone. However, when the cartridge 20 is inserted, in order to ensure that the back surface 41d and the front surface 45b come into contact with each other, the entire one surface has a substantially truncated conical convex shape, and the other surface has a substantially truncated conical concave shape. The shape is desirable. Further, in order for the cover member 45 to reliably push up the cover member 41 against the urging force of the compression spring 42, the front surface 45b is a convex shape of a substantially truncated cone and the back surface 41d is a concave shape of a substantially truncated cone. It is desirable.

  Further, in the present embodiment, the diameter of the insertion portion 41a and the holes 24e and 24f and the diameter of the insertion portion 45a and the holes 35d and 35e are substantially the same, but these diameters may not be substantially the same. The diameter of the part 45a and the holes 35d and 35e may be equal to or larger than the diameter of the insertion part 41a and the holes 24e and 24f. If the diameters of the insertion portion 45a and the holes 35d and 35e are equal to or larger than the diameters of the insertion portion 41a and the holes 24e and 24f, the cover member 45 can surely push up the cover member 41 against the urging force of the compression spring 42. In addition, hydraulic oil does not adhere to the back surface 41d during use of the filter device 1.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included. . For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, a part of the configuration of the embodiment can be replaced with the configuration of the other embodiment, and other configurations can be added to, deleted from, or replaced with the configuration of the embodiment.

  Further, in the present invention, “substantially” is a concept including not only a case where they are exactly the same but also errors and deformations that do not lose the identity. For example, the “substantially cylindrical shape” is not limited to a strictly cylindrical shape. In addition, for example, in the case where the expression is simply “substantially center”, the case is not limited to strictly the center, but includes the case of the approximate center.

1: Filter device 10: Cover 20: Cartridge 21: Filter medium 21a: Plate 22: Handle part 22a: Grasping part 23: Outer cylinder 24: Valve receiving member 24a: Inner cylinder part 24b: Plate-like part 24c: Outer cylinder part 24d : Grooves 24e, 24f: Hole 24g: Projection 30: Filter case 31: Tubular portion 31a: Flange 32: Head 32a: Case 32b: Main body 32c: Inlet 32d: Hole 32e: Shaft 32f: Cylindrical portion 32g: Hole 33: Discharge pipe 34: Valve 35: Plate 35a: Main body 35b: Cylindrical portion 35c: Groove 35d, 35e: Hole 35f: Cylindrical portion 35g: Hole 36: Compression springs 40, 46: Valve 41: Cover member 41a: Insertion Portion 41b: Flange portion 41c: Groove 41d: Back surface 41e: Projection portion 42: Compression spring 45: Cover member 45a: Join the club 45b: surface 45 c: Groove 45d: protruding portions 50,51,52,55,56,57: sealing member

Claims (3)

A cartridge having a substantially cylindrical filter medium, and a valve receiving member provided on an end surface of the filter medium;
A filter case having a cylindrical portion in which the cartridge is provided; and a head to which the cartridge is mounted;
With
The valve receiving member is formed with a substantially cylindrical first hole through which oil flows into the filter medium, and a second hole through which filtered oil that is oil filtered by the filter medium flows out,
The valve receiving member includes a first cover member having a substantially disc-shaped first insertion portion that is inserted into the first hole and closes the first hole, and the first insertion portion includes the first hole. A first compression spring that disposes the first cover member at a position that closes the first valve, and a substantially disc-shaped second insertion portion that is inserted into the second hole and closes the second hole. A second cover member, and a second valve having a second compression spring that arranges the second cover member at a position where the second insertion portion closes the second hole,
The head has a plate-like member formed with a third hole having a diameter equal to or larger than the diameter of the first hole and a fourth hole having a diameter equal to or larger than the diameter of the second hole, and the inside of the third hole. A third cover member having a substantially disc-shaped third insertion portion to be inserted; a fourth cover member having a substantially disc-shaped fourth insertion portion to be inserted into the fourth hole; and the plate-like shape. A force is applied to the member in a direction away from the head, and the third insertion portion closes the third hole and the fourth insertion portion closes the fourth hole. 3 compression springs,
One of the first surface of the first cover member and the third surface of the third cover member is a convex shape, and the other is a concave shape complementary to the convex shape,
Either one of the second surface of the second cover member and the fourth surface of the fourth cover member is a convex shape, and the other is a concave shape complementary to the convex shape,
The cartridge is inserted into the filter case, the first surface and the third surface are in contact with each other, the second surface and the fourth surface are in contact with each other, and the urging force of the third compression spring is applied. When the plate member is pressed against the cartridge by the cartridge, the third cover member presses the first cover member against the biasing force of the first compression spring, and the second compression spring The fourth cover member presses the second cover member against an urging force,
When the cartridge is mounted on the head, the first hole and the third hole are connected, the second hole and the fourth hole are connected, and the internal space of the cartridge and the filter case A filter device characterized by communicating with an internal space. The first surface and the second surface are generally conical concave shapes, and the third surface and the fourth surface are generally conical convex shapes. 2. The filter device according to 1. The outer peripheral surfaces of the first cover member and the second cover member are provided with seal members that contact the inner peripheral surfaces of the first hole and the second hole, respectively. The filter device according to 1.

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