JP3204806U - Filter device - Google Patents

Abstract

A filter device capable of reliably preventing the use of non-genuine parts. A first plate 15 provided at an end of a filter medium includes a main body part 15a having a ring-shaped part whose bottom surface comes into contact with the filter medium, and an outer cylinder part 15b formed along the outer periphery of the main body part 15a. And an inner cylinder portion 15c formed along the inner periphery of the main body portion 15a, and a plurality of protrusions 15d formed to protrude radially inward from the inner periphery of the main body portion 15a or the inner cylinder portion 15c. The lid member 16 whose outer periphery is smaller than the inner diameter of the main body portion 15a and the inner cylinder portion 15c is attached so as to cover the hollow portion of the first plate 15. The back surface of the lid member 16 is in contact with the projection 15d, and the convex portion or the concave portion formed on the back surface of the lid member 16 is fitted into the fitted portion formed on the projection 15d. [Selection] Figure 2

Description

  The present invention relates to a filter device.

  Patent Document 1 discloses a filter structure in which a lid-side convex portion that protrudes toward an end surface of a filter element is formed on the lower surface of the lid member, and a filter-side concave portion that is shaped to fit with the lid-side convex portion is formed in the filter element. Is disclosed.

Utility model registration No. 3185612

  In the device described in Patent Literature 1, there is a possibility that a non-genuine part can be used by cutting the lid-side convex part and the filter-side concave part of the genuine part.

  This invention is made | formed in view of such a situation, and it aims at providing the filter apparatus which can prevent reliably use of components other than a regular article.

  In order to solve the above problems, a filter device according to the present invention includes, for example, a hollow cylindrical filter medium having openings at both ends, a first plate and a second plate provided at both ends of the filter medium, and the first plate. A lid member attached to the first plate so as to cover a hollow portion of one plate, and when the lid member is attached to the first plate, the lid member is disposed between the first plate and the lid member. The first plate includes a main body portion having an annular portion whose bottom surface comes into contact with the filter medium, an outer cylinder portion formed along an outer periphery of the main body portion, An inner cylinder part formed along an inner periphery of the main body part, and a plurality of protrusions formed to protrude radially inward from the inner periphery of the main body part or the inner cylinder part, and the lid member is The diameter of the outer periphery is the inner diameter of the main body and the A convex portion or a concave portion is formed on the back surface of the lid member that is smaller than an inner diameter of the cylindrical portion, and a plurality of projections are formed on the plurality of projections to be fitted with the convex portion or the concave portion, respectively. When the portion or the concave portion and the fitted portion are fitted, the back surface of the lid member and the plurality of protrusions come into contact with each other.

  According to the filter device according to the present invention, the first plate provided at the end of the filter medium includes a main body portion having an annular portion whose bottom surface is in contact with the filter medium, and an outer cylinder portion formed along the outer periphery of the main body portion. A first plate having an inner cylinder portion formed along the inner periphery of the main body portion and a plurality of protrusions formed to project radially inward from the inner periphery of the main body portion or the inner cylinder portion. A lid member is attached so as to cover the hollow portion. The back surface of the lid member is in contact with the projection, and the convex portion formed on the back surface of the lid member is fitted to the fitted portion formed on the projection. Since the outer periphery of the lid member is smaller than the inner diameters of the main body portion and the inner cylinder portion, the lid member cannot be attached to the first plate if the protrusion is cut to eliminate the fitted portion. Thereby, use of components other than a regular product can be prevented reliably.

  Here, two said protrusions may be formed in the position which opposes. As a result, it is possible to reliably prevent the use of parts other than the regular product with the smallest number of protrusions, that is, with a simple shape.

  Here, the seal member is provided between an inner peripheral surface of the first plate and an outer peripheral surface of the lid member, and the seal member is an outer periphery of the inner peripheral surface of the first plate and the lid member. When provided between the first and second surfaces, the sealing member may be elastically deformed to be in close contact with the inner peripheral surface of the first plate and the outer peripheral surface of the lid member. Accordingly, the first plate and the lid member can be integrated, and the lid member can be prevented from being detached from the first plate when the lid member is pulled up.

  Here, an annular holding ring having elasticity formed by bending a metal rod is further provided, and a groove having a depth smaller than the diameter of the holding ring is formed on the inner peripheral surface of the main body portion of the plate. When the pressing ring is provided in the groove in a state where the convex portion or the concave portion and the fitted portion are fitted, the pressing ring may abut on the groove and the lid member. Thereby, the lid member is prevented from coming off.

  Here, the convex portion or the fitted portion may have a shape representing a character. Thereby, the user can visually recognize a convex part or a to-be-fitted part as a character.

  According to the present invention, it is possible to reliably prevent the use of parts other than the genuine products.

It is the schematic of the filtration apparatus 1 concerning the 1st Embodiment of this invention. It is a figure which shows the detail of the plate 15, the cover member 16, and the sealing member 17. FIG. It is a figure explaining the fitting part of the plate 15 and the cover member 16. FIG. It is a figure explaining the case where the filter element 10-1 using the plate 15-1 in which the protrusion 15d is not formed is used accidentally. It is a figure showing filter element 10A using plate 15A concerning a 2nd embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<First Embodiment>
FIG. 1 is a diagram showing an outline of the filtration device 1. The filtering device 1 removes dust and the like contained in a liquid such as oil and water using a filter, and mainly includes a filter element 10 and a hydraulic circuit 20. The filter element 10 is provided inside the hydraulic circuit 20.

  The filter element 10 mainly includes an outer cylinder 11, an inner cylinder 12, a filter medium 13 provided between the outer cylinder 11 and the inner cylinder 12, and plates provided at both ends of the outer cylinder 11, the inner cylinder 12 and the filter medium 13. 14 and 15. Further, the filter element 10 is provided with a lid member 16, a seal member 17, and a pressing ring 18. The filter element 10 with the lid member 16 and the like attached thereto is referred to as a filter device 30.

  The outer cylinder 11 and the inner cylinder 12 are substantially hollow cylindrical members having openings at both ends. The outer cylinder 11 and the inner cylinder 12 are formed using a highly corrosion-resistant material (for example, stainless steel) or resin. The inner cylinder 12 is accommodated inside the outer cylinder 11. The diameter of the inner cylinder 12 is smaller than that of the outer cylinder 11, and the height of the inner cylinder 12 is substantially the same as the height of the outer cylinder 11.

  A plurality of holes (not shown) are formed in substantially the entire area of the outer cylinder 11 and the inner cylinder 12. The hole formed in the outer cylinder 11 communicates the outer side and the inner side of the outer cylinder 11, and the hole formed in the inner cylinder 12 communicates the outer side and the inner side of the inner cylinder 12. The outer cylinder 11 is not an essential configuration.

  The filter medium 13 has a substantially hollow cylindrical shape having a thickness in the radial direction. The filter medium 13 is formed by folding a sheet-like filter paper using synthetic resin, paper, or the like, and connecting both ends of the folded filter paper and rounding it into a cylindrical shape. The height of the filter medium 13 is substantially the same as that of the outer cylinder 11 and the inner cylinder 12.

  The liquid that has passed through the holes formed in the outer cylinder 11 passes through the filter medium 13 from the outside to the inside. At that time, impurities in the liquid are removed by the filter medium 13. The liquid that has passed through the inside of the filter medium 13 passes through the hole formed in the inner cylinder 12 and flows out into the inner cylinder 12.

  A plate 14 is provided at one end of the outer cylinder 11 and the inner cylinder 12, and a plate 15 is provided at the other end. The plate 14 and the plate 15 are provided so as to cover the ends of the outer cylinder 11 and the inner cylinder 12 with the filter medium 13 provided therebetween. In other words, the outer cylinder 11, the inner cylinder 12, and the filter medium 13 are provided inside the plate 14 and the plate 15.

  The plate 14 and the plate 15 are bottomed substantially cylindrical members, and are formed using a resin or a material having high corrosion resistance (for example, stainless steel). The plates 14 and 15 may be provided with gaskets (not shown). Thereby, the outer cylinder 11, the inner cylinder 12, the filter medium 13, the plate 14, and the plate 15 are integrated as the filter element 10.

  The lid member 16 is provided on the plate 15. The seal member 17 is an annular member formed of an elastic member such as rubber. When the lid member 16 is provided on the plate 15, the seal member 17 is elastically deformed and comes into close contact with the plate 15 and the lid member 16. The plate 15, the lid member 16, and the seal member 17 will be described in detail later.

  The hydraulic circuit 20 mainly includes a tank 21, an inflow pipe 22, and an outflow pipe 23. The tank 21 forms an inner room 24 and an outer room 26. The inner chamber 24 has a bottomed shape with an upper end opened. The upper end opening of the inner chamber 24 is liquid-tightly closed by the tank cover 25. The outer room 26 is formed so as to surround the inner room 24.

  The filter element 10 is provided inside the inner chamber 24. A communication pipe 27 communicating with the inner room 24 and the outer room 26 is provided so as to penetrate the bottom surface of the inner room 24. A communication tube 27 is fitted into the lower end opening of the filter element 10, that is, the hollow portion of the plate 14.

  A fixing spring 28 is provided between the upper surface of the lid member 16 and the lower surface of the tank cover 25 to prevent the filter element 10 from floating.

  The inflow pipe 22 is provided so as to penetrate the side surface of the tank 21 in the vicinity of the upper end of the side surface of the tank 21. The inflow pipe 22 opens inside the inner chamber 24. The outflow pipe 23 is provided so as to penetrate the bottom surface of the tank 21. The outflow pipe 23 opens into the outer chamber 26.

  The arrows in FIG. 1 indicate the flow of liquid. The inflow pipe 22 guides the liquid F1 to be filtered to the inner chamber 24. The outflow pipe 23 guides the clean liquid F2 after filtration from the outer chamber 26 to other parts of the hydraulic circuit 20.

  The liquid flow is not limited to this. For example, the liquid may flow from below and the liquid may flow from above or from the side.

FIG. 2 is a diagram showing details of the plate 15, the lid member 16, and the seal member 17.
The plate 15 has a main body portion 15a, an outer cylinder portion 15b, an inner cylinder portion 15c, and a protrusion 15d. In FIG. 2, the boundary between the inner cylinder portion 15 c and the protrusion 15 d is indicated by a dotted line, but this is only indicated by a dotted line for the sake of explanation.

  The main body 15a is a member having an annular portion, and has a substantially L-shaped cross section, for example. The lid member 16 is inserted into the hollow portion of the main body portion 15a. Further, a groove 15e with which the seal member 17 abuts and a groove 15j with which a pressing ring 18 (detailed later) is fitted are formed on the inner peripheral surface of the main body portion 15a. The bottom surface 15f of the annular portion of the main body 15a abuts on the outer cylinder 11, the inner cylinder 12, and the filter medium 13 (not shown in FIG. 2).

  The outer cylinder portion 15b is formed to protrude downward (−z direction) from the main body portion 15a along the outer periphery of the main body portion 15a. The outer cylinder portion 15b covers the outer periphery of the outer cylinder 11 that is in contact with the bottom surface 15f.

  The inner cylinder portion 15c is formed to protrude downward (−z direction) from the main body portion 15a along the inner periphery of the main body portion 15a. The inner cylinder portion 15c covers the inner periphery of the inner cylinder 12 that is in contact with the bottom surface 15f.

  The diameter of the inner periphery of the main body portion 15a and the diameter of the inner periphery of the inner cylinder portion 15c are the same. In addition, the same in the present invention is a concept including the same case and the case where it can be identified as the same but not the same.

  Hereinafter, the inner peripheral surface of the main body portion 15a and the inner peripheral surface of the inner cylinder portion 15c are referred to as an inner peripheral surface 15g (see FIG. 3). In the present embodiment, the groove 15e is formed on the inner peripheral surface of the main body portion 15a, but the groove 15e may be formed on the inner peripheral surface 15g. That is, the groove 15e may be formed on the inner peripheral surface of the main body portion 15a, or may be formed on the inner peripheral surface of the inner cylinder portion 15c.

  The protrusion 15d is a plate-like member, and is formed to protrude radially inward from the inner peripheral surface of the inner cylinder portion 15c. The protrusion 15d may be formed on the inner peripheral surface 15g, or may be formed to protrude radially inward from the inner periphery of the main body portion 15a. In the present embodiment, two protrusions 15d are formed at opposing positions.

  A hole 15i (see FIG. 3) is formed in the protrusion 15d. The hole 15i will be described in detail later.

  The lid member 16 includes a main body portion 16a, a handle 16b, and a relief valve 16c.

  The main body portion 16 a has a substantially disc shape and is provided on the plate 15 of the filter element 10. The main body portion 16a is sized to fit into the hollow portions of the main body portion 15a and the inner cylinder portion 15c. That is, the outer peripheral diameter of the main body portion 16a is smaller than the inner diameter of the inner peripheral surface 15g. The back surface (-z side surface) 16f of the main body portion 16a abuts on the protrusion 15d.

  A groove 16e is formed on the side surface 16d of the main body 16a. A seal member 17 is provided in the groove 16e. When the lid member 16 is provided on the plate 15, the seal member 17 provided in the groove 16e is elastically deformed and comes into close contact with the groove 15e. Thereby, the hollow part of the plate 15, ie, the inner side of the inner cylinder 12, is liquid-tightly closed.

  The handle 16b is formed on the upper surface (the surface on the + z side) of the main body portion 16a. The relief valve 16c is provided at the center of the back surface 16f of the main body 16a. The relief valve 16c is opened when the pressure outside the filter element 10 becomes larger than a predetermined value. Since the relief valve 16c is well-known, detailed description is abbreviate | omitted.

  FIG. 3 is a diagram illustrating a fitting portion between the plate 15 and the lid member 16. In FIG. 3, the plate 15 is viewed obliquely from above and the lid member 16 is viewed from obliquely below. In FIG. 3, the relief valve 16c is not shown.

  The back surface 16f of the main body portion 16a faces the upper surface 15h of the protrusion 15d of the plate 15. A plurality of convex portions 16g are formed on the back surface 16f so as to protrude downward (in the −z direction) in FIG.

  The convex portion 16g has, for example, a shape representing a character. In the present embodiment, the number of convex portions 16g is eight (4 × 2 sets), and includes shapes representing the characters “D”, “M”, “O”, and “X”.

  The convex portion 16g is fitted into a hole 15i formed in the protrusion 15d. In other words, the hole 15i is formed in a shape in which the convex portion 16g can be fitted. In the present embodiment, the hole 15i has a shape including a mirror image of the letters “D”, “M”, “O”, and “X”.

  When the back surface 16f comes into contact with the upper surface 15h and the convex portion 16g is fitted into the hole 15i, the side surface 16d is fitted into the inner peripheral surface 15g, and the seal member 17 is in close contact with the groove 16e and the groove 15e. Thereby, the lid member 16 is provided on the plate 15.

  Further, positioning ribs 16h are provided on the back surface 16f. The rib 16h protrudes downward (in the −z direction) in FIG. 2 in the same manner as the convex portion 16g. The rib 16h is positioned between the two protrusions 15d when the convex portion 16g is fitted into the hole 15i.

  In addition, the shape of the hole 15i and the convex part 16g is not limited to this. The plurality of holes 15i and the convex portions 16g may have a shape representing at least one of a character, a symbol, and a pattern, and a mirror image shape thereof. For example, the convex part 16g and the hole 15i may be the mirror image shape of the company name or registered trademark of the company that manufactures and sells the filter element 10 and the hydraulic actuator in which the filter element 10 is incorporated. .

  Further, the positions of the holes 15i (projections 15d) and the convex portions 16g are not limited to this. For example, three protrusions 15d may be formed, holes 15i may be formed in each protrusion 15d, and the protrusions 16g may be formed at positions where they can be fitted thereto. However, the number of the projections 15d is the smallest when two locations are formed at opposing positions.

  Furthermore, what is formed in the protrusion 15d is not limited to the hole 15i. For example, the protrusion 16g may have a shape that can be fitted, and a recess that is deeper than the height of the protrusion 16g may be formed in the protrusion 15d. Note that the recess includes a hole.

  Returning to the description of FIG. When the lid member 16 is provided on the plate 15, the seal member 17 is elastically deformed and comes into close contact with the groove 16 e and the groove 15 e, so that the seal member 17 integrates the lid member 16 and the plate 15.

  The holding ring 18 is an elastic member formed by, for example, bending a metal rod into an annular shape. Both ends of the pressing ring 18 are bent at approximately 90 degrees. Since the pressing ring 18 has elasticity, when a force is applied in a direction in which the bent ends are brought closer, the pressing ring 18 is deformed in a direction in which the diameter decreases. Further, when the force is removed, the shape of the pressing ring 18 returns to its original shape due to elasticity.

  The holding ring 18 is fitted into a groove 15j formed on the inner peripheral surface 15g of the plate 15.

  The groove 15j is concave toward the outside in the radial direction, and has an annular shape along the inner peripheral surface 15g. The depth of the concave shape is shallower than the diameter of the pressing ring 18. Therefore, when the pressing ring 18 is fitted into the groove 15j, a part of the pressing ring 18 comes out of the groove 15j. It is more desirable that the depth of the concave shape of the groove 15j is shallower than the radius of the pressing ring 18.

  The groove 15j is formed at a position that is substantially as high as the thickness of the main body portion 16a from the upper surface 15h of the protrusion 15d. Therefore, when the convex portion 16g is fitted in the hole 15i and the lid member 16 is provided on the plate 15, a part of the pressing ring 18 is engaged with the vicinity of the peripheral edge of the upper surface of the main body portion 16a. In this way, the lid member 16 is prevented from coming off by the pressing ring 18.

  Thereby, the cover member 16 is integrated with the filter element 10 so as to be detachable and not easily detached. The stopper of the lid member 16 is not limited to the structure using the pressing ring 18.

Next, operations of the filter element 10 and the hydraulic circuit 20 will be described.
Plates 14 and 15 are attached to both ends of the filter medium 13 inserted between the outer cylinder 11 and the inner cylinder 12, and the filter element 10 is assembled.

  Thereafter, the lid member 16 is attached to the plate 15 so that the convex portion 16g fits into the hole 15i formed in the protrusion 15d and the back surface 16f contacts the top surface 15h. As a result, the lid member 16 is provided on the filter element 10. Since the lid member 16 is provided with the seal member 17 in advance, the seal member 17 is also provided on the filter element 10 together with the lid member 16.

  At this time, the lid member 16 is overlapped after the positions are determined to some extent so that the convex portion 16g and the hole 15i face each other. In addition, when the convex part 16g and the hole 15i do not fit in the state which accumulated the cover member 16, the cover member 16 is rotated with respect to the plate 15. FIG. For example, when the rib 16h is in contact with the protrusion 15d, the lid member 16 is on the plate 15. When the lid member 16 is rotated with respect to the plate 15 from this state and the rib 16h is positioned between the projections 15d, the convex portion 16g and the hole 15i face each other, and the convex portion 16g and the hole 15i can be fitted. .

  When the pressing ring 18 is mounted in the groove 15j in a state where the lid member 16 is provided on the plate 15, the lid member 16 is prevented from coming off by the pressing ring 18.

  Next, as shown in FIG. 1, the filter device 30 is provided in the inner chamber 24 of the tank 21 using the tank cover 25 and the fixing spring 28. In this state, the liquid F <b> 1 to be filtered is guided from the inflow pipe 22 to the inside of the inner chamber 24 of the tank 21.

  The liquid F1 to be filtered passes through a hole formed in the outer cylinder 11 of the filter element 10 and is filtered by the filter medium 13. The clean liquid F2 after filtration enters the inner cylinder 12 from the hole formed in the inner cylinder 12. When the pressure inside the inner chamber 24 becomes higher than a predetermined value, the relief valve 16c (see FIG. 2) is opened.

  The opening of the plate 15 is liquid-tightly closed by the lid member 16 and the seal member 17. For this reason, the liquid F1 to be filtered does not enter from a portion other than the hole formed in the outer cylinder 11.

  The clean liquid F 2 that has entered the inside of the inner cylinder 12 is guided to the inside of the outer chamber 26 of the tank 21 through the communication pipe 27. The liquid F2 accumulates in the outer chamber 26 and is guided from the outflow pipe 23 to other parts of the hydraulic circuit 20 by a pump or the like (not shown).

  The filter element 10 is replaced with a new filter element 10 periodically or as necessary because the filtering ability gradually decreases by filtering the liquid F1 to be filtered. Hereinafter, the exchange procedure will be described.

  First, the tank cover 25 and the fixing spring 28 are removed, and the filter device 30 is taken out from the inside chamber 24 of the tank 21. At this time, the filter element 10 is pulled up by holding the handle 16b of the lid member 16. However, if the pressing ring 18 is mounted in the groove 15j, the filter device 30 can be pulled up without removing the lid member 16.

  When the filter device 30 is removed from the hydraulic circuit 20, the holding ring 18 is removed from the groove 15j. Next, the lid member 16 is removed from the filter element 10. Thereby, the used filter element 10 is taken out. The lid member 16, the seal member 17, and the pressing ring 18 are used again.

  The unused new filter element 10 is provided with a lid member 16 and a seal member 17 that are removed from the used filter element 10. Next, the holding ring 18 removed from the used filter element 10 is mounted in the groove 15j.

  When the filter element 10 is replaced, the user of the filter element 10 visually recognizes the hole 15 i formed in the protrusion 15 d of the plate 15 and the convex portion 16 g formed in the lid member 16. Therefore, it is desirable to form the convex portion 16g or the hole 15i in a shape that can be visually recognized as a character so that the user can easily recognize the character as a character.

  Next, as shown in FIG. 4, the case where the filter element 10-1 using the plate 15-1 on which the protrusion 15d is not formed is used by mistake will be described. Since the filter element 10-1 has the same configuration as the filter element 10 except for the plate 15-1, the illustration and detailed description of the configuration other than the plate 15-1 are omitted.

  The plate 15-1 has no protrusion 15d. For this reason, when the cover member 16 is attached to the filter element 10-1, the back surface 16f of the cover member 16 does not come into contact with the protrusion 15d. Therefore, the cover element 16 is used due to a pressure difference between the inside and the outside of the filter element 10-1. The lid member 16 may fall inside the inner cylinder 12.

  According to the present embodiment, it is possible to prevent the filter element 10-1, which is an unauthorized product other than the regular filter element 10, from being attached to the lid member 16. Therefore, use other than the regular filter element 10 can be reliably prevented.

  In this embodiment, as a measure for preventing the attachment of the non-genuine product, the convex portion 16g is formed on the lid member 16 and the hole 15i is formed on the projection 15d of the plate 15. Not limited to. For example, as a measure for preventing attachment of the non-genuine product, a protrusion may be formed on the protrusion 15d, and a recess that fits into the protrusion may be formed on the lid member 16. Further, the cover member 16 may be formed with a convex portion 16g, the protrusion 15d may be formed with a hole 15i, the protrusion 15d may be formed with a convex portion, and a concave portion that fits into the convex portion may be formed in the cover member 16. . For example, for “D” and “O”, the protrusion 16 g and the hole 15 i are fitted, and for “M” and “X”, the protrusion formed on the protrusion 15 d and the recess formed on the lid member 16. And may be fitted.

<Second Embodiment>
In the first embodiment, the pressing ring 18 is attached to the groove 15j to prevent the filter element 10 from falling off, but the pressing ring 18 is not essential. FIG. 5 is a diagram showing a filter element 10A using a plate 15A according to the second embodiment. Since the filter element 10A has the same configuration as the filter element 10 except for the plate 15A, the illustration and detailed description of the configuration other than the plate 15A are omitted.

  The plate 15 has a main body portion 15k, an outer cylinder portion 15b, an inner cylinder portion 15c, and a protrusion 15d. In FIG. 5, the boundary between the inner cylinder portion 15 c and the protrusion 15 d is indicated by a dotted line, but this is only indicated by a dotted line for the sake of explanation.

  The main body portion 15k is an annular member. A groove 15e with which the seal member 17 abuts is formed on the inner peripheral surface of the main body portion 15k (the groove 15j is not formed). In other respects, the main body 15k is the same as the main body 15a.

  Depending on the size (weight) of the outer cylinder 11, the inner cylinder 12, the filter medium 13, etc., it is desirable to provide the pressing ring 18. However, in the case of a small filter element 10A, etc., when the seal member 17 is elastically deformed and closely contacts the plate 15A and the lid member 16, the plate 15A and the lid member 16 are integrated and the handle 16b is pulled up. The lid member 16 can be prevented from being detached from the plate 15A.

  According to the present embodiment, it is possible to provide a filter element with a simple structure that reliably prevents the use of a non-genuine product.

  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 includes design changes and the like within a scope not departing from the gist of the present invention. . A person skilled in the art can appropriately change, add, or convert each element of the embodiment.

  Further, in the present invention, “substantially” is not only a case where they are exactly the same, but also a concept including errors and deformations that do not lose the identity. For example, “substantially identical” is not limited to exactly the same case, and is a concept including an error that does not lose the identity. Further, for example, in the case of simply expressing the same, not only the exact same case but also the substantially identical case is included. Further, in the present invention, “near” means including a region in a certain range (which can be arbitrarily determined) near the reference position. For example, in the case of the vicinity of A, it is a concept indicating that it is an area in a certain range near A and may or may not include A.

1: Filtering device 10, 10-1, 10A: Filter element 11: Outer cylinder 12: Inner cylinder 13: Filter media 14, 15, 15-1, 15A: Plates 15a, 15k: Main body part 15b: Outer cylinder part 15c: Inner Tube portion 15d: Protrusion 15e: Groove 15f: Bottom surface 15g: Inner peripheral surface 15h: Upper surface 15i: Hole 15j: Groove 16: Cover member 16a: Main body portion 16b: Handle 16c: Relief valve 16d: Side surface 16e: Groove 16f: Back surface 16g : Convex portion 16h: rib 17: seal member 18: holding ring 20: hydraulic circuit 21: tank 22: inflow pipe 23: outflow pipe 24: inner chamber 25: tank cover 26: outer chamber 27: communication pipe 28: for fixing Spring 30: Filter device

Claims (5)

A hollow cylindrical filter medium having openings at both ends;
A first plate and a second plate provided at both ends of the filter medium;
A lid member attached to the first plate so as to cover the hollow portion of the first plate;
A seal member provided between the first plate and the lid member when the lid member is attached to the first plate;
The first plate has a main body portion having an annular portion whose bottom surface is in contact with the filter medium, an outer cylinder portion formed along an outer periphery of the main body portion, and an inner periphery of the main body portion. An inner cylinder portion formed, and a plurality of protrusions formed to project radially inward from the inner periphery of the main body portion or the inner cylinder portion,
The lid member has an outer diameter smaller than an inner diameter of the main body part and an inner diameter of the inner cylinder part,
A convex portion or a concave portion is formed on the back surface of the lid member,
Each of the plurality of protrusions is formed with a fitted portion that fits with the convex portion or the concave portion,
When the convex portion or the concave portion and the fitted portion are fitted, the back surface of the lid member and the plurality of protrusions come into contact with each other. The filter device according to claim 1,
The filter device is characterized in that the plurality of protrusions are formed at two positions facing each other. The filter device according to claim 1,
The seal member is provided between an inner peripheral surface of the first plate and an outer peripheral surface of the lid member;
When the seal member is provided between the inner peripheral surface of the first plate and the outer peripheral surface of the lid member, the seal member is elastically deformed and the inner peripheral surface of the first plate and the lid member A filter device characterized by being in close contact with an outer peripheral surface. The filter device according to claim 1,
It further comprises a holding ring having elasticity formed by bending a metal rod into an annular shape,
A groove having a depth smaller than the diameter of the pressing ring is formed on the inner peripheral surface of the main body of the plate,
When the pressing ring is provided in the groove in a state in which the convex portion or the concave portion and the fitted portion are fitted, the pressing ring comes into contact with the groove and the lid member. . The filter device according to claim 1,
The said convex part or the said to-be-fitted part is a shape showing a character, The filter apparatus characterized by the above-mentioned.

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