JP6403514B2 - Filter device - Google Patents

Description

  The present invention relates to a filter device.

  Patent Document 1 discloses a filtration device including a case unit and a cartridge assembly inserted into the case unit. In the invention described in Patent Document 1, the cartridge assembly has an element, and only the element is replaced and other parts are reused.

JP 2005-288293 A

  In the invention described in Patent Document 1, since the inner cylinder is provided in the element, there is a problem that when the element is replaced, the inner cylinder must be replaced together. In general, since the inner cylinder is made of metal, including the inner cylinder in the element increases the cost of the element.

  This invention is made | formed in view of such a situation, and it aims at providing the filter apparatus which can replace | exchange only a resin part easily and can improve recyclability.

In order to solve the above problems, a filter device according to the present invention includes, for example, a filter element having a substantially cylindrical filter medium, and a first end member provided at a first end of the filter medium, and an internal A substantially cylindrical case into which the filter element is inserted, and a substantially cylindrical inner cylinder that is inserted into the filter medium when the filter element is inserted into the case. A cover assembly having a case assembly including: a cover assembly that covers an open end of the case; and a valve provided on the cover member. A detachable cover assembly, wherein the valve has a substantially cylindrical first fitting surface along a longitudinal direction of the filter medium, and the first end member is the first end member. Having a second fitting surface on which the fitting surface is fitted, When the fitting surface is fitted into the second fitting surface, wherein the filter element is attached to said valve, said filter element, the second end is an end other than the first end of the filter media A rib-like protrusion along the longitudinal direction is formed on the inner cylinder, and the protrusion is formed on the first end member and the second end member. the inserted notch is formed, characterized in Rukoto.

According to the filter device of the present invention, the valve provided on the cover member that covers the open end of the case in the cover assembly has a substantially cylindrical first fitting along the longitudinal direction of the filter medium included in the filter element. Has a surface. The first end member provided at the first end of the filter medium has a second fitting surface with which the first fitting surface is fitted, and the first fitting surface is the second fitting surface. When fitted, the filter element is attached to the valve. The cover assembly has a substantially cylindrical case into which a filter element is inserted, and a substantially cylindrical inner cylinder that is inserted inside the filter medium and has a large number of openings. Detachable. Thereby, only a resin part (filter element) can be replaced | exchanged easily and recyclability can be improved. Further, the filter element can be positioned in the rotation direction (circumferential direction).

  Here, a concave portion is formed in the second fitting surface, an elastic member is inserted into the concave portion, and the first fitting surface is fitted to the second fitting surface. The elastic member may be elastically deformed by the first fitting surface. Thereby, a sealing effect is obtained and liquid is prevented from leaking from between the valve and the filter element. Furthermore, the filter element can be more securely attached to the valve.

  Here, the case assembly has a substantially cylindrical protective inner cylinder inserted into the inner cylinder, and the case, the inner cylinder, and the protective inner cylinder are integrated, and the integrated In the converted state, the height from the lower end of the inner cylinder to the upper end of the protective inner cylinder may be not more than half the height from the lower end of the inner cylinder to the upper end of the inner cylinder. Thereby, at the time of filter element replacement | exchange, it can prevent that the liquid which is not filtered flows out inside a protection inner cylinder.

Here, before SL case assembly includes a cup-shaped positioning member on which the second end member is inserted, the central axis of the central shaft and the positioning member of said second end member, said It may be offset in the radial direction with respect to the central axis of the case and the inner cylinder. Thereby, it can prevent that the filter element in which the countermeasure against counterfeit goods is not taken is attached to a case assembly.

  ADVANTAGE OF THE INVENTION According to this invention, only the resin part can be replaced | exchanged easily and the filter apparatus which can improve recyclability is provided.

It is the schematic of the filtration apparatus 1 which is the 1st Embodiment of this invention. 1 is a cross-sectional view of a filtration device 1. FIG. 2 is an enlarged view of a main part of a cross section of the filtration device 1. FIG. 2A is an exploded perspective view of the case assembly 30, and FIG. 3A is a perspective view of an outer portion 30 </ b> A of the case assembly 30 including a case 31, a head cover 35, a flange portion 36, and the like, and FIG. FIG. 5 is a perspective view of an inner portion 30B including a protective inner cylinder 33, a head member 34, and the like. 2 is an enlarged view of a main part of a cross section of the filtration device 1. FIG. 2 is an enlarged view of a main part of a cross section of the filtration device 1. FIG. It is a figure which shows the positional relationship of the height of the liquid level at the time of filter element replacement | exchange, and the protection inner cylinder. It is a principal part enlarged view in sectional drawing of the filtration apparatus 2, (A) is the case of the regular goods in which the countermeasure against the counterfeit goods was taken, and (B) is the case of the counterfeits.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is a schematic view of the filtration device 1. The filtration device 1 is provided inside the tank 50. The tank 50 is provided with a flange 51 in which a hole 51a into which a liquid such as water or oil flows is formed. The liquid is supplied into the filtration device 1 through the hole 51a and the introduction pipe 52 (see arrow α in FIG. 1). The liquid supplied to the filtration device 1 is filtered by the filtration device 1 and discharged into the tank 50 from below the filtration device 1 (see arrow β in FIG. 1).

  FIG. 2 is a cross-sectional view of the filtration device 1. The filtration device 1 mainly includes a cover assembly 10, a filter element 20, and a case assembly 30.

  The cover assembly 10 mainly includes a cover 11 and a valve 12. The cover assembly 10 attaches the filtering device 1 to the tank 50 while covering an opening formed at the upper end (+ z side end) of the case assembly 30.

  The cover assembly 10 will be described in detail. FIG. 3 is an enlarged view of a main part of a cross section of the filtration device 1. The cover 11 is formed with a screw hole 11a. The cover 11 is coupled to the flange portion 36 fixed to the case 31 via the attachment portion 37 by a bolt or the like inserted into the hole 11a. As a result, the cover assembly 10 is coupled to the case assembly 30.

  The valve 12 is fixed to the back side (−z side) of the cover 11 with a screw or the like. The valve 12 includes a valve body 12a, a moving part 12b, and an elastic member 12c. When the pressure (external pressure) between the case 31 and the filter element 20 becomes higher than the internal pressure (internal pressure) of the filter element 20, it moves against the elastic force of the elastic member 12c due to the differential pressure between the external pressure and the internal pressure. The portion 12b is pushed down (-z direction) (see the white arrow in FIG. 3). Thereby, the bypass flow path 12d formed in the valve body 12a is opened, and the liquid flows out from the outside of the filter element 20 to the inside of the filter element 20 separately from the normal flow of liquid (see the solid line arrow in FIG. 3). (See dotted arrow in FIG. 3).

  Returning to the description of FIG. The filter element 20 mainly includes a filter medium 21, an upper end member 22, and a lower end member 23.

  The filter medium 21 is, for example, a substantially cylindrical member formed by bending a thin resin plate into a pleat shape. An upper end member 22 is provided at the upper end (+ z side end) of the filter medium 21, and a lower end member 23 is provided at the lower end (−z side end) of the filter medium 21. The upper end member 22 and the lower end member 23 are made of resin and have a substantially cylindrical portion that fits with other components.

  As shown in FIG. 3, the valve body 12a has a cylindrical fitting surface 12x. Further, the upper end member 22 has a fitting surface 22x to be fitted with the fitting surface 12x. The fitting surface 22x is formed with a dimension that allows fitting to fit snugly with the fitting surface 12x, for example, a dimension (indentation dimension) in which the inner diameter of the fitting surface 22x is smaller than the outer diameter of the fitting surface 12x. The As a result, when the fitting surface 12x and the fitting surface 22x are fitted, the filter element 20 is attached to the valve 12.

  A recess 22y is formed in the fitting surface 22x. An elastic member (for example, an O-ring) 41 is inserted into the recess 22y. When the fitting surface 12x and the fitting surface 22x are fitted, the elastic member 41 is elastically deformed by the fitting surface 12x. As a result, a sealing effect is obtained, and liquid is prevented from leaking from between the valve body 12a and the upper end member 22. Further, the elastic member 41 is elastically deformed, so that the filter element 20 can be more securely attached to the valve 12.

  In order to mount the filter element 20 on the valve 12, it is not essential that the recess 22y and the elastic member 41 are provided.

  Returning to the description of FIG. The case assembly 30 mainly includes a case 31, an inner cylinder 32, a protective inner cylinder 33, a head member 34, a head cover 35, and a flange portion 36. Each component (case 31, inner cylinder 32, protective inner cylinder 33, head member 34, head cover 35, flange portion 36, etc.) constituting the case assembly 30 is made of metal. In particular, the case 31, the inner cylinder 32, and the protective inner cylinder 33 are formed in a substantially cylindrical shape using a thin metal plate. In addition, the case 31, the inner cylinder 32, and the protection inner cylinder 33 should just be a substantially cylindrical shape, and do not need to be a substantially cylindrical shape.

  The inner cylinder 32 is formed with a number of holes (not shown) through which the filtered liquid passes. Each component constituting the case assembly 30 may be made of resin, but is preferably made of metal in consideration of thickness reduction, size reduction, strength, ease of manufacture, cost, and the like.

  The case 31, the inner cylinder 32, and the protective inner cylinder 33 are disposed substantially concentrically. The case 31, the inner cylinder 32, and the protective inner cylinder 33 are integrally formed via a head member 34, a head cover 35, and the like. The head cover 35 and the flange portion 36 are attached to and integrated with the case 31.

  An outflow pipe 35 a is provided on the bottom surface of the head cover 35. Further, a hole 35 b into which the introduction pipe 52 is inserted is formed on the side surface of the head cover 35.

  The case assembly 30 will be described in detail. FIG. 4 is an exploded perspective view of the case assembly 30. 4A is a perspective view of the outer portion 30A of the case assembly 30 including the case 31, the head cover 35, the flange portion 36, and the like, and FIG. 4B is an inner cylinder 32, a protective inner cylinder 33, and a head. It is a perspective view of inner part 30B containing member 34 grade | etc.,.

  As shown in FIG. 4A, the head cover 35 is a substantially bottomed cylindrical member. A case 31 is attached to an opening facing the bottom surface 35c of the head cover 35 (+ z side). Since the case 31 has a substantially cylindrical shape, the outer portion 30A has a substantially bottomed cylindrical shape.

  The outflow pipe 35a is integrated with the bottom surface 35c. Further, when the inner portion 30B is inserted into the hollow portion of the outer portion 30A, the bottom surface 35c of the head cover 35 and the bottom surface of the head member 34 are fixed to the bottom surface 35c with screws or the like. Thereby, all the components (case 31, inner cylinder 32, protective inner cylinder 33, head member 34, head cover 35, flange portion 36, etc.) included in the case assembly 30 are integrated.

  As shown in FIG. 4B, a hole 34 a is formed on the side surface of the head member 34. The introduction pipe 52 is inserted into the hole 34a. Further, a hole 34b is formed on the upper surface (the surface on the + z side) of the head cover 35.

  The head member 34 is provided with an attachment portion 34c, and the protective inner cylinder 33 is attached to the attachment portion 34c. Although not shown, the protective inner cylinder 33 and the outflow pipe 35a are connected inside the head member 34. Further, the wall 34d (see FIG. 2) provided inside the head member 34 separates the liquid flowing into the head member 34 from the introduction pipe 52 and the liquid flowing into the head member 34 from the protective inner cylinder 33. Accordingly, the liquid introduced into the head cover 35 through the introduction pipe 52 flows out of the head member 34 (here, between the case 31 and the inner cylinder 32) from the hole 34b. Further, the liquid flowing in from the protective inner cylinder 33 flows out of the filtering device 1 from the outflow pipe 35a.

  An attachment portion 38 is provided on the outer peripheral surface of the protective inner cylinder 33, and the inner cylinder 32 is provided on the attachment portion 38. The inner cylinder 32 is provided with a positioning projection 32a. The protrusion 32 a is formed in a rib shape along the central axis of the inner cylinder 32.

  FIG. 5 is an enlarged view of a main part of a cross section of the filtration device 1. The attachment portion 38 includes a first attachment portion 38a and a second attachment portion 38b. The first attachment portion 38a and the second attachment portion 38b are substantially cylindrical members having a substantially L-shaped cross section. The first attachment portion 38a connects the outer periphery of the protective inner cylinder 33 and the second attachment portion 38b, and the second attachment portion 38b connects the first attachment portion 38a and the inner cylinder 32. Thereby, the inner cylinder 32 and the protection inner cylinder 33 are integrated.

  When the filter element 20 is inserted between the case 31 (not shown in FIG. 5) and the inner cylinder 32, the lower end member 23 of the filter element 20 and the upper surface (the surface on the + z side) of the mounting portion 38 are provided. The contact member 39 contacts.

  The lower end member 23 has a substantially bottomed cylindrical filter medium attachment portion 23a into which the filter medium 21 is inserted. A cutout 23c having substantially the same shape as the protrusion 23a is formed on the inner peripheral surface 23b of the filter medium mounting portion 23a. When the filter element 20 is inserted between the case 31 and the inner cylinder 32, the filter element 20 is positioned in the rotational direction (circumferential direction) by inserting the protrusion 32a into the notch 23c. In the present embodiment, in the cross section parallel to the direction orthogonal to the central axis, the protrusion 23a is a substantially semicircular arc-shaped protrusion, and the notch 23c is a substantially semicircular arc-shaped recess. The shape of the notch 23c is not limited to this.

  When the notch 23 c is not formed in the lower end member 23, the protrusion 32 a and the lower end member 23 collide with each other, and the filter element 20 cannot be inserted into the case assembly 30. Thus, the protrusion 32a and the notch 23c provide the effect of preventing the imitation product from being attached together with the rotational positioning effect.

  The contact member 39 has a substantially bottomed tubular filter element attachment portion 39a. The inner periphery of the filter element attachment portion 39 a is fitted with the lower end member 23.

  The lower end member 23 has a substantially cylindrical contact portion 23d. The outer periphery of the contact portion 23d can be fitted so as to fit the inner periphery of the filter element attachment portion 39a, for example, the inner diameter of the filter element attachment portion 39a is smaller than the outer diameter of the contact portion 23d. (Press-fit dimension).

  When the filter element 20 has been inserted into the case assembly 30, the outer periphery of the contact portion 23d and the inner periphery of the filter element attachment portion 39a are fitted, and the filter element 20 is positioned in the radial direction.

  A recess 23e is formed on the outer periphery of the contact portion 23d, and an elastic member (for example, an O-ring) 42 is provided in the recess 23e. When the outer periphery of the contact portion 23d and the inner periphery of the filter element attachment portion 39a are fitted, the elastic member 42 is elastically deformed by the inner periphery of the filter element attachment portion 39a. As a result, a sealing effect is obtained, and liquid is prevented from leaking from the outside of the filter medium 21 to the inside of the filter medium 21.

  Next, an assembling / disassembling method and operation of the thus configured filtering device 1 will be described.

  As shown in FIG. 2, first, the case assembly 30 is inserted into the tank 50. Next, the filter element 20 attached to the cover assembly 10 is inserted into the case assembly 30.

  Bolts 61 inserted into a plurality of holes 11 a formed at a predetermined pitch in the circumferential direction of the cover 11 fix the cover assembly 10 to the flange portion 36. As a result, the cover assembly 10 is attached to the case assembly 30, and the filter element 20 attached to the cover assembly 10 is inserted between the case 31 and the inner cylinder 32.

  When the filter element 20 is inserted between the case 31 and the inner cylinder 32, first, the protrusion 23a is inserted into the notch 23c, and then the cut formed on the upper end member 22 as shown in FIG. The protrusion 23a is inserted into the notch 22a (substantially the same shape as the notch 23c). Thereby, the cover assembly 10 and the filter element 20 are positioned in the rotation direction.

  Bolts (not shown) inserted into a plurality of holes 36 a formed at a predetermined pitch in the circumferential direction of the flange portion 36 fix the flange portion 36, that is, the case assembly 30 to the tank 50. The flange portion 36 and the cover 11 are fastened together by bolts 61. Thereby, the filtration device 1 is fixed to the tank 50. Thereby, the filtration apparatus 1 is assembled.

  The liquid flowing in from the introduction pipe 52 flows between the case 31 and the filter element 20 via the head member 34 as shown by the arrow in FIG. Thereafter, the liquid flowing between the case 31 and the filter element 20 is filtered by the filter element 20 and flows into the inner cylinder 32 through the holes formed in the inner cylinder 32. The liquid flowing into the inner cylinder 32 flows out of the outflow pipe 35a through the protective inner cylinder 33.

  When a certain amount of liquid is filtered, the filtration performance deteriorates, so that the filter element 20 needs to be replaced.

  When the bolt 61 or the like that fixes the cover assembly 10 to the case assembly 30 is removed and the cover assembly 10 is pulled upward (+ z direction), the outer periphery of the contact portion 23d and the inner periphery of the filter element attachment portion 39a Is disengaged (see FIG. 5), and the filter element 20 is pulled out together with the cover assembly 10.

  Thereafter, the fitting surface 12x and the fitting surface 22x are disengaged (see FIG. 3), and the filter element 20 is removed from the cover assembly 10, whereby only the filter element 20 can be replaced. In the present embodiment, the metal inner cylinder 32 is integrated with the case assembly 30 and is not included in the filter element 20. Therefore, only the resin part (filter element 20) can be replaced, and the metal part can be reused.

Since the filtering device 1 is provided inside the tank 50, when the filter element 20 is replaced, a part of the liquid that has not been filtered remains in the filtering device 1. FIG. 7 is a diagram showing the positional relationship between the height of the liquid level and the protective inner cylinder 33 when the filter element is replaced.

  The lower end of the filter element 20, that is, the lower end of the filter element attachment portion 39a is provided so as to be higher (positioned on the + z side) than the liquid level S of the liquid remaining inside the filtering device 1 when the filtering device 1 is stopped. Therefore, when the filter element 20 is replaced, it is possible to prevent the liquid from adhering to the filter element 20 from increasing the weight of the filter element 20. Further, it is possible to shorten the time for waiting for the liquid to be cut off from the filter element 20 when the filter element 20 is replaced.

  In the present embodiment, the distance h2 from the reference position H to the bottom surface of the inner cylinder 32 is set to be approximately 2 to 2.3 times the distance h1 from the reference position H to the upper end of the protective inner cylinder 33. Is done. That is, in the integrated state, the height from the lower end of the inner cylinder 32 to the upper end of the protective inner cylinder 33 is not more than half of the height from the lower end of the inner cylinder 32 to the upper end of the inner cylinder 32. This is because, when the filtering device 1 is mounted on a vehicle or the like, the liquid level is shaken by vibration, but the liquid level S is not higher than the upper end of the protective inner cylinder 33 due to the vibration, and when the filter element 20 is replaced, This is to prevent the unfiltered liquid from flowing out to the outflow pipe 35a.

  According to the present embodiment, since the metal inner cylinder 32 is included not in the filter element 20 but in the case assembly 30, only the resin portion (filter element 20) can be replaced, and the recyclability is improved. be able to.

  According to the present embodiment, since the cover 11 and the valve 12 are integrated as the cover assembly 10, the valve 12 can be securely attached to the filter element 20 when the filter element 20 is replaced.

  Moreover, according to this Embodiment, since the filter element 20 is attached to the valve | bulb 12, a structure becomes simple and replacement | exchange of the filter element 20 becomes easy. Furthermore, since the filter element 20 is attached to the valve 12, a crimp spring for crimping the filter element 20 to the case 31 that is necessary for the conventional structure can be eliminated. This reduces the number of parts, facilitates assembly, and further reduces costs.

  Moreover, according to this Embodiment, since the protection inner cylinder in which the hole is not formed is provided inside the inner cylinder in which the hole is formed, liquid dripping can be prevented when the filter element is replaced.

<Second Embodiment>
The second embodiment of the present invention is a form in which measures for preventing counterfeit goods are taken. Hereinafter, the filtration apparatus 2 which concerns on the 2nd Embodiment of this invention is demonstrated. The difference between the filtering device 1 and the filtering device 2 is only the lower end member of the filter element and the contact member of the case assembly. In the filtration device 2, the same components as those in the filtration device 1 are denoted by the same reference numerals and description thereof is omitted.

  FIG. 8 is an enlarged view of a main part in a cross-sectional view of the filtration device 2. FIG. 8A shows a case of a genuine product in which counterfeit product prevention measures are taken, and FIG. 8B shows a case of a counterfeit product.

  As shown in FIG. 8A, the filter element 20A includes a filter medium 21, an upper end member 22, and a lower end member 23A. The lower end member 23A has a substantially bottomed cylindrical filter medium attachment portion 23a into which the filter medium 21 is inserted. A notch 23c is formed in the inner peripheral surface 23b of the filter medium mounting portion 23a.

  The lower end member 23A has a substantially cylindrical contact portion 23f. The center of the contact portion 23f is the central axis A2, and the radius of the outer periphery of the contact portion 23f is the radius r. The central axis A2 of the contact portion 23f is offset in the radial direction with respect to the central axis A1 of the filter medium 21. In other words, the outer periphery of the contact portion 23f is asymmetric with respect to the central axis A1, and the radius of the outer periphery of the contact portion 23f centered on the central axis A1 of the filter medium 21 depends on the position of the contact portion 23f in the circumferential direction. Change. Specifically, the smallest distance r1 (r1 <r) among the distances from the center axis A1 of the filter medium 21 to the outer periphery of the contact part 23f is the distance from the center axis A1 of the filter medium 21 to the outer periphery of the contact part 23f. Is smaller than the largest distance r2 (r2> r).

  A concave portion 23g is formed in the contact portion 23f, and an elastic member 42 is provided in the concave portion 23g.

  A contact member 39 </ b> A is provided on the upper surface (+ z side surface) of the attachment portion 38. The contact member 39A has a substantially bottomed tubular filter element attachment portion 39b that fits with the lower end member 23A.

  The center axis A2 of the filter element attachment portion 39b is the same as the center axis A2 of the contact portion 23f. The inner periphery of the filter element attachment portion 39b can be fitted so as to fit the outer periphery of the contact portion 23f, for example, the inner diameter of the filter element attachment portion 39b is smaller than the outer diameter of the contact portion 23f. (Press-fit dimension).

  Therefore, when the lower end member 23A comes into contact with the contact member 39A, the contact portion 23f and the filter element attachment portion 39b are fitted, and the filter element 20A is attached to the case assembly 30C.

  However, as shown in FIG. 8B, when the filter element 20 is inserted into the case assembly 30C, the lower end member 23 interferes with the contact member 39A, and the filter element 20 can be attached to the case assembly 30C. Can not.

  This will be specifically described. The central axis of the lower end member 23 is the same as the central axis A1 of the filter medium 21. If the radius of the substantially cylindrical abutting portion 23d of the lower end member 23 is r2, r2 is larger than r1, and therefore the lower end of the abutting portion 23d is at the upper end of the filter element attachment portion 39b on the left side in FIG. have a finger in the pie. Therefore, the filter element 20 cannot be inserted all the way into the contact member 39A.

  Although not shown, if the radius of the filter element 20 is r1, the lower end member 23 can be inserted into the filter element mounting portion 39b. However, on the right side in FIG. 8B, a gap is formed between the lower end member 23 and the filter element attachment portion 39b. As a result, the filter element 20 moves with respect to the case assembly 30 </ b> C and cannot function as the filtration device 2.

  According to the present embodiment, it is possible to prevent the filter element that has not been subjected to counterfeit countermeasures from being attached to the case assembly.

  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.

  For example, in the first embodiment and the second embodiment, a differential pressure sensor may be provided in the flange 51 to measure the differential pressure between the external pressure and the internal pressure of the filter element 20. Further, the flange 51 may be provided with a contamination degree measuring device for measuring the contamination degree of the liquid. The contamination degree measuring apparatus measures, for example, the amount of impurities contained in the liquid based on the light that is applied to the liquid and reflected by the liquid.

  The differential pressure measured by the differential pressure sensor and the contamination level of the liquid measured by the contamination level measuring device may be displayed on a display unit provided on the flange 51 or the like, or may be wired or wirelessly connected to the differential pressure sensor or contamination. It may be output to an external device connected to a degree measuring device or the like. In the case of outputting to an external device, the external device may obtain the life of the filter element 20 based on the transition of the differential pressure, the degree of contamination, or the like, or generates a signal based on these measurement results, and the filtering device. A signal may be output to a vehicle provided with the above, another device, or the like. For example, the signal generated by the external device includes a signal for prompting replacement of the filter element, a signal indicating the degree of contamination of the liquid, and the like. Accordingly, it is possible to prompt the user to replace the filter element and to remotely manage the liquid state. As a result, a failure of the vehicle or the like can be predicted or the reliability of the vehicle or the like can be improved.

  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.

1, 2: Filtration device 10: Cover assembly 11: Cover 11a: Hole 12: Valve 12a: Valve body 12b: Moving part 12c: Elastic member 12d: Bypass passage 12x: Fitting surface 20, 20A: Filter element 21: Filter medium 22: Upper end member 22a: Notch 22x: Fitting surface 22y: Recess 23, 23A: Lower end member 23a: Filter medium mounting portion 23b: Inner peripheral surface 23c: Notches 23d, 23f: Contact portions 23e, 23g: Recess 30 30C: Case assembly 30A: Outer portion 30B: Inner portion 31: Case 32: Inner tube 32a: Protrusion 33: Protection inner tube 34: Head member 34a: Hole 34b: Hole 34c: Mounting portion 34d: Wall 35: Head cover 35a : Outflow pipe 35b: Hole 35c: Bottom surface 36: Flange portion 36a: Hole 37: Mounting portion 38: Mounting portion 38a 1st attachment part 38b: 2nd attachment part 39, 39A: Contact member 39a, 39b: Filter element attachment part 41, 42: Elastic member 50: Tank 51: Flange 51a: Hole 52: Introducing pipe 61: Bolt A1 : Center axis A2: Center axis H: Reference position S: Liquid level

Claims (4)

A filter element having a substantially cylindrical filter medium, and a first end member provided at a first end of the filter medium;
A substantially cylindrical case into which the filter element is inserted; and a substantially cylindrical inner cylinder to be inserted into the filter medium when the filter element is inserted into the case. A case assembly having an inner cylinder formed with an opening;
A cover assembly having a lid member that covers an open end of the case; and a valve provided on the lid member, the cover assembly being detachable from the case assembly;
With
The valve has a substantially cylindrical first fitting surface along the longitudinal direction of the filter medium,
The first end member has a second fitting surface into which the first fitting surface is fitted,
When the first fitting surface is fitted to the second fitting surface, the filter element is attached to the valve ,
The filter element has a second end member provided at a second end which is an end other than the first end of the filter medium,
The inner cylinder is formed with rib-shaped protrusions along the longitudinal direction,
Wherein the first end member and said second end member, a filter device, characterized in that notches the protrusions are inserted Ru is formed. The filter device according to claim 1,
A recess is formed in the second fitting surface,
An elastic member is inserted into the recess,
When the first fitting surface is fitted to the second fitting surface, the elastic member is elastically deformed by the first fitting surface. The filter device according to claim 1 or 2 ,
The case assembly has a substantially cylindrical protective inner cylinder inserted into the inner cylinder,
The case, the inner cylinder, and the protective inner cylinder are integrated, and in the integrated state, the height from the lower end of the inner cylinder to the upper end of the protective inner cylinder is the lower end of the inner cylinder The filter device is not more than half of the height from the top to the upper end of the inner cylinder. The filter device according to any one of claims 1 to 3 ,
Before SL case assembly includes a cup-shaped positioning member on which the second end member is inserted,
The filter device, wherein a center axis of the second end member and a center axis of the positioning member are offset in a radial direction with respect to a center axis of the case and the inner cylinder.

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