JP4595826B2 - Filter device and filter cartridge - Google Patents

Description

  The present invention relates to a filter device for purifying air sucked into an engine and a filter cartridge used in the filter device.

As this type of conventional filter device, for example, ones having configurations as shown in Patent Document 1 and Patent Document 2 have been proposed.
In the configuration described in Patent Document 1, the case of the filter device is configured by a bottomed cylindrical case body having one end opened and a lid that is detachably attached to the open end of the case body. A cylindrical filter cartridge is inserted into the case body, and a lid is attached. By tightening the butterfly bolt provided on the lid, the filter cartridge is inserted through the closed end plate on the butterfly bolt side. The filter cartridge is pressed against the inner surface of the case body, and the filter cartridge is held in the case while being sandwiched between the case body and the lid.

  Further, in the configuration described in Patent Document 2, in a state where the cylindrical filter cartridge is locked and held on the inner surface of the lid body, the lid body is attached to the open end in the bottomed cylindrical case body with one end opened. By being attached, the filter cartridge is inserted into the case body. In this state, the lid is clamped and fixed to the case body, so that the annular seal portion provided at the tip of the filter cartridge is pressed against the inner surface of the case body, and the filter cartridge is attached to the case body and the lid. It is held in the case while being sandwiched between the body and the body.

Conventionally, a filter cartridge having the configuration shown in FIG. 10 is also embodied. In this conventional configuration, the case 40 includes a case main body 42 having a bottomed cylindrical shape and a lid body 43, and a seal cylinder 41 a provided at one end of the cylindrical filter cartridge 41 is used as an inner surface of the case main body 42. The filter cartridge 41 is inserted and held in the case main body 42 by being inserted into and fitted into the holding cylinder 42 a projecting from the case. In this state, the lid body 43 is fixed to the open end of the case body 42, whereby the seal plate 41b provided at the other end of the filter cartridge 41 is pressed against the inner surface of the lid body 43, so that the filter cartridge 41 is The case 40 is held in a clamped state between the case main body 42 and the lid body 43.
Japanese Utility Model Publication No. 5-83353 Japanese Utility Model Publication No. 6-60760

  However, these conventional filter devices have the following problems. That is, in the configuration described in Patent Document 1, it is necessary to tighten and rotate the butterfly bolt when assembling the filter cartridge in the case. In this case, it is necessary to tighten the butterfly bolt with a strong force in order to secure the sealing property of the filter cartridge mounting portion, and there is a problem that the assembling work is troublesome and troublesome. In addition, the configuration described in Patent Document 1 requires a closed lid plate, a butterfly bolt, and the like in addition to the case and the filter cartridge, which increases the number of parts and complicates the configuration.

  Even in the configuration described in Patent Literature 2, when the lid is assembled to the open end of the case, the seal portion at the tip of the filter cartridge needs to be brought into pressure contact with the inner side surface of the case. Sometimes it takes a lot of effort and requires a strong force.

  Similarly, in the conventional configuration shown in FIG. 10, since the seal cylinder 41a at the tip of the filter cartridge 41 needs to be forcibly fitted into the holding cylinder 42a, a strong force is required at the time of assembly. That is, in the conventional configuration shown in FIG. 10, not only is the airtightness between the seal cylinder 41a and the holding cylinder 42a held by their pressure contact, but the seal cylinder 41a is also capable of maintaining the sealing performance. Therefore, it is formed of a member such as rubber and has a high friction coefficient. Therefore, the assembly of the filter cartridge 41 needs to be performed against a high frictional resistance, and therefore has a considerably strong force and is a very troublesome operation.

  Moreover, in the conventional configurations shown in Patent Documents 1 and 2 and FIG. 10, since the filter cartridge is sandwiched and held between the case and the lid, the length of the filter cartridge, the length of the case and the lid, There is also a problem that a fixed dimensional relationship needs to be set between the two, and the versatility of the filter cartridge or the case is poor.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is that the filter cartridge can be easily assembled to the case without requiring a strong force or troublesome work, and the length of the filter cartridge needs to be set according to the length of the case. Therefore, an object of the present invention is to provide a filter device that can improve versatility such as a filter cartridge.

In order to achieve the above object, the present invention provides a filter device including a case and a cylindrical filter cartridge that is detachably mounted in the case, and a seal ring is provided on an outer periphery of the filter cartridge. together with the engaging projection provided on at least one location of the periphery of the filter cartridge, the inner circumference of the case, the engaging projection engaged with the holding portion for locking holding the filter cartridge within the case When the a sealing surface on which the sealing ring in engagement holding state of the filter cartridge are joined is formed, the holding portion is a flange portion formed inner circumference of the case, said flange portion, A recess is formed through which the engagement protrusion can pass along the axial direction of the case. By rotating the filter cartridge about its axis, the flange portion is sandwiched between the engagement protrusion and the seal ring, and the seal surface is one side surface of the flange portion and the outer periphery of the recess. The seal ring is formed over the entire circumference, and the lip portion of the seal ring is joined .

Therefore, according to this configuration, the filter cartridge is inserted into the case, and the engagement protrusions on the outer periphery of the filter cartridge are engaged with the holding portions in the case, so that the filter cartridge is clamped from both ends thereof. Even if not, it can be locked and held in the case. At this time, the seal ring on the outer periphery of the filter cartridge is joined to the sealing surface in the case, the mounting portion of the filter cartridge is sealed against the inside of the case, and the airtightness of the mounting portion is maintained. Therefore, when assembling the filter cartridge in the case, it can be assembled easily and in a short time without requiring strong force or troublesome work. Further, since it is not necessary to hold the filter cartridge in the case, it is not necessary to set the length of the filter cartridge according to the length of the case. Therefore, even a short filter cartridge can be used. The versatility of the cartridge or case can be enhanced.
Moreover, it is only necessary to push the filter cartridge in its axial direction and rotate it, and the assembly can be performed easily.

Further, in the above configuration, the filter cartridge is configured by a filter element and a ring member provided on an outer periphery of one end of the filter element, and the engagement protrusion is formed on an outer periphery of the ring member . the seal ring may be fitted on the outer periphery of the ring member. In such a configuration, the structure is simple and the engagement protrusion and the seal ring can be easily provided on the outer periphery of the filter cartridge.

Further, the engaging protrusion and the flange, by providing the locking means for locking the holding state the filter cartridge relative to the flange portion can be effectively held without departing from the filter cartridge in the mounting state.

In addition, the engaging projection and the flange portion, by providing the confirmation means wherein the filter cartridge has to be able to see a state of being arranged in a defined position relative to the flange portion with respect to a specified position the filter cartridge It becomes possible to install without mistake.

  As described above, according to the present invention, the filter cartridge can be easily assembled to the case without requiring a laborious work, and the length of the filter cartridge can be set to the length of the case. There is no need to set according to the height, and the excellent versatility of the filter cartridge and the case can be enhanced.

(First embodiment)
Below, 1st Embodiment of this invention is described based on FIGS.
As shown in FIG. 1, the case 10 of this filter device is provided with a lid 15 that detachably closes the other end open portion of the bottomed cylindrical case body 11 with one end open. A cylindrical inlet 12 projects from the peripheral wall of the case body 11 and a cylindrical outlet 13 projects from the center of the end wall opposite to the opening. A substantially cylindrical filter cartridge 14 is detachably mounted in the case 10. The lid 15 is fixed by a clamp fitting 16 in the closed state. When the filter device is connected to the intake side of an engine (not shown) and the engine is operated, air is sucked from the inlet 12 into the case body 11 and passed through the filter cartridge 14. And is sucked from the outlet 13 to the intake side of the engine.

  As shown in FIGS. 1 and 3, in the filter cartridge 14, a substantially cylindrical filter element 14c constitutes a filtering portion, and the filter element 14c includes a flat filter sheet 17a and a fold-fold filter sheet. The filter material 17 composed of 17b is formed in a spiral shape so as to form a cylindrical shape as a whole. In FIG. 1, the upper and lower filter members 17 on the left side are omitted, and in FIG. 2, the filter element 14c is drawn as a simple cylinder. One end of one of the adjacent honeycomb spaces 14a and 14b of the filter element 14c is closed by the closing member 19, and the other end of the other honeycomb space 14a and 14b is closed by the closing member 19. . Therefore, the air flow is introduced into the filter cartridge 14 from the open end on the right side of FIG. 1 of one of the honeycomb spaces 14a and 14b, and passes through the filter wall of the filter material 17 between the honeycomb spaces 14a and 14b while being filtered. The other honeycomb spaces 14a and 14b reach the engine side from the open ends of the honeycomb spaces 14a and 14b on the left side in FIG.

  As shown in FIG. 1, FIG. 2, FIG. 4 and FIG. 5, a ring member 20 is fixed to the outer periphery of the tip portion (left side in FIG. 1) of the filter element 14c, and its axial direction (left-right direction in FIG. 1) A stepped portion 20a is formed at the intermediate portion. Engagement protrusions 21 are formed at four locations at equal intervals on the outer periphery of the tip of the ring member 20. A locking protrusion extending in the radial direction and a positioning protrusion 22 as a confirmation means are formed on the side surface of each engagement protrusion 21 that faces the stepped portion 20a, and a confirmation protrusion is provided on the outer peripheral surface of each engagement protrusion 21. The confirmation mark 23 is attached.

  On the outer periphery of the ring member 20, a seal ring 24 is fitted so as to be joined to the stepped portion 20 a, and is arranged in parallel with the engagement protrusion 21 in the axial direction of the filter cartridge 14. The seal ring 24 is formed of a lip seal, and the lip portion 24a faces the engagement protrusion 21 side.

  As shown in FIGS. 1, 2, and 6, a flange portion 25 as a holding portion is formed on the inner periphery of the outlet 13 of the case body 11. At the inner peripheral edge of the flange portion 25, notch recesses 26 for allowing the engagement protrusions 21 on the filter cartridge 14 to pass are formed at four equal intervals, and the inner surface of the flange portion 25 (the right side in FIG. 1). A seal surface 25a joined to the seal ring 24 is formed on the entire surface. In the vicinity of one side of each notch recess 26, on the outer surface of the flange portion 25, a locking groove 27 that can be engaged with the positioning protrusion 22 on each engagement protrusion 21 and a positioning groove 27 as a confirmation means are formed. ing. Corresponding to one positioning groove 27 located above, a confirmation window 28 as a confirmation means made of a transparent material is formed on the upper peripheral wall of the outlet 13.

  The seal ring 24 is coated with grease for reducing the friction coefficient, and the corner portion of the notch recess 26 facing the seal ring 24 is formed in an arc shape so that no edge is formed. The grease is for making the seal ring 24 slip easily on the flange portion 25 of the case body 11 when the filter cartridge 14 to be described later is assembled, and the arc of the corner portion has the seal ring 24 on the flange portion 25. This is to prevent the seal ring 24 from being damaged by the edge during the movement.

Next, a method of assembling the filter cartridge 14 in the case 10 in the filter device configured as described above will be described.
When the filter cartridge 14 is assembled, the filter cartridge 14 is inserted into the case main body 11 with the lid 15 removed from the open end of the case main body 11. Then, the respective engagement protrusions 21 on the filter cartridge 14 are caused to protrude outside the flange portion 25 through the respective notch recesses 26 in the case body 11 along the axial direction of the case body 11. In this state, the lip portion 24a of the seal ring 24 is joined to the seal surface 25a of the flange portion 25, and an airtight state between the seal ring 24 and the case body 11 is formed. Next, when the filter cartridge 14 is rotated in the direction of the arrow in FIG. 7 with respect to the case main body 11, each engagement protrusion 21 and the seal ring 24 are in a state of sandwiching the flange portion 25, and each engagement protrusion 21. The upper positioning protrusions 22 are engaged with the respective positioning concave grooves 27 on the flange portion 25 to be locked. Therefore, as shown in FIGS. 1 and 2, the filter cartridge 14 is locked and held in the case main body 11.

  At this time, as shown in FIGS. 1 and 2, the confirmation mark 23 on the engagement protrusion 21 positioned above is disposed below the confirmation window 28. Therefore, it is possible to confirm that the filter cartridge 14 is assembled and held at a specified position in the case body 11 by viewing the confirmation mark 23 through the confirmation window 28. Thereafter, when the lid 15 is attached to the open end of the case main body 11 by the clamp fitting 16, the assembly work of the filter cartridge 14 to the case main body 11 is completed.

Therefore, the filter device of this embodiment has the following effects.
(1) By simply pushing the filter cartridge 14 in the axial direction and turning it, the engagement protrusion 21 and the seal ring 24 hold the flange portion 25 of the case body 11, and the filter cartridge 14 is held by the case body 11. Is done. For this reason, the filter cartridge 14 can be easily held in the case body 11 regardless of the attachment of the lid 15 to the case body 11. Therefore, the filter cartridge 14 can be easily and quickly assembled into the case main body 11 without requiring a troublesome work having a strong force.

  (2) Since the filter cartridge 14 is not configured to be sandwiched and held between the case body 11 and the lid 15, an end plate or a fastening bolt may be used on the end surface of the filter cartridge 14 on the lid 15 side. Therefore, the number of parts can be reduced and the configuration can be simplified.

  (3) As described above, the filter cartridge 14 is held by the engagement between the flange portion 25 and the engagement protrusion 21, and is not sandwiched between the case main body 11 and the lid body 15. Therefore, it is not necessary to set the length of the filter cartridge 14 according to the length of the case 10. Therefore, if the filter cartridge 14 is shorter than the case 10, it can be used regardless of its length, and the versatility of the filter cartridge 14 or the case 10 can be improved.

  (4) Since the positioning protrusion 22 of the engaging protrusion 21 engages with the positioning groove 27 of the flange portion 25, the case main body 11 and the filter cartridge 14 are locked. it can. Further, when the positioning protrusions 22 are engaged with the positioning concave grooves 27, the operator can confirm the state with a click feeling, so that the operation becomes easier and the filter cartridge 14 is erroneously set to the specified position. Can be installed without.

  (5) In the state where the filter cartridge 14 is disposed at the specified position, the confirmation mark 23 faces the confirmation window 28, so that the filter cartridge 14 is disposed at the defined position via the confirmation window 28. This can be confirmed visually.

( Reference example )
Next, a reference example of the present invention will be described with a focus on differences from the first embodiment.
In this reference example , as shown in FIGS. 8 and 9, the end wall on the outlet side of the case main body 11 is formed as an annular thick part 31, and the inner side surface of the thick part 31 (FIG. 8). A seal surface 31a that is joined to the seal ring 24 on the outer periphery of the filter cartridge 14 is formed over the entire periphery. The thick portion 31 has four notch recesses 32 for inserting the engaging protrusions 21 on the filter cartridge 14, and a holding groove 33 as a holding portion extending in the circumferential direction from the back of each notch recess 32. And are formed. On the inner bottom surface of each holding groove 33, a positioning groove 34 that can be engaged with the positioning protrusion 22 on each engaging protrusion 21 is formed.

  Then, when the filter cartridge 14 is assembled into the case main body 11, the engagement protrusions 21 of the filter cartridge 14 are inserted into the respective notch recesses 32 of the case main body 11, as indicated by a chain line in FIG. Rotate in the direction of the arrow in the figure. Then, each engagement protrusion 21 enters the holding groove 33 from the notch recess 32, and the positioning protrusion 22 on the engagement protrusion 21 is engaged with the positioning groove 34 in the holding groove 33, and the filter cartridge. 14 is latched and held in the case body 11. At this time, the seal ring 24 on the filter cartridge 14 is joined to the seal surface 31a in the case body 11 and sealed.

Therefore, in this reference example , the portion of the case main body 11 that engages and holds the filter cartridge 14 is close to the peripheral wall of the case main body 11. For this reason, the thing of a large diameter can be used as the ring member 20 of the filter cartridge 14, and the filtration capability can be improved.

(Example of change)
Note that this embodiment and the reference example may be modified and embodied as follows.
As the filter cartridge 14, one having a simple cylindrical structure in which the peripheral wall is formed by a cylindrical filter portion or a one having a fold-fold structure in which the peripheral wall is formed by a fold-fold filter portion is used.

  The number of engagement protrusions 21 formed on the outer periphery of the filter cartridge 14 and the number of locations where the cutout recesses 26 and 32 of the case body 11 are formed are arbitrarily changed. For example, the engagement protrusion 21 and the notch recesses 26 and 32 are one, two, three, or five or more.

The positioning grooves 27 and 34 are formed on the side of the engagement protrusion 21 on the filter cartridge 14, and the positioning protrusion 22 is formed on the case body 11 side.
An electrical detection configuration is provided instead of the confirmation configuration including the confirmation mark 23 and the confirmation window 28 as confirmation means. For example, a permanent magnet is provided on the outer peripheral surface of the engaging protrusion 21 on the filter cartridge 14, and a hall element for detecting the permanent magnet on the case body 11 side and confirming the assembly position of the filter cartridge 14 is provided.

  The ring member 20 of the filter cartridge 14 is provided at the center in the length direction of the filter element 14c. In this way, although the one end portion side of the filter element 14c is arranged in a protruding state on the engine side, the protruding amount on the other end portion side is reduced, and the case 10 can be miniaturized.

The end of the filter cartridge 14 opposite to the seal ring 24 is configured to be pressed by the lid 15.
In the case where the filter cartridge 14 is mounted with directionality in the direction of rotation about its axis, at least one of the plurality of engaging protrusions 21 is provided at a position deviated from the uniform distribution position in the circumferential direction. Accordingly, the notch recesses 26 and the like on the flange portion 25 side are similarly arranged at positions deviating from the uniform distribution position. With this configuration, in the configuration in which the filter cartridge 14 is mounted with directionality, if the mounting direction is incorrect, the mounting becomes impossible, so that the filter cartridge 14 can be mounted without misdirection.

Sectional drawing which shows the filter apparatus of 1st Embodiment. The fragmentary sectional view which expands and shows a part of filter apparatus of FIG. Sectional drawing in the 3-3 line of FIG. The principal part front view which shows the filter cartridge in the filter apparatus of FIG. The side view of the filter cartridge. Sectional drawing of the case in the 6-6 line | wire of FIG. Sectional drawing which shows the process in which a filter cartridge is assembled | attached to the case shown in FIG. The fragmentary sectional view which shows the filter apparatus of a reference example . The fragmentary sectional view in the 9-9 line | wire of FIG. Sectional drawing which shows the conventional filter apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Case, 11 ... Case main body, 14 ... Filter cartridge, 14c ... Filter element, 15 ... Cover, 20 ... Ring member, 21 ... Engagement protrusion, 22 ... Positioning protrusion, 24 ... Seal ring, 25 ... Holding Flange portion as part, 25a ... sealing surface, 26 ... notch recess, 27 ... positioning groove, 31 ... thick portion, 31a ... seal surface, 32 ... notch recess, 33 ... holding groove as holding portion, 34 ... Positioning ridge.

Claims (5)

In a filter device comprising a case and a cylindrical filter cartridge detachably mounted in the case,
Provided with a sealing ring on the outer periphery of the filter cartridge, the engaging projection provided on at least one location of the periphery of the filter cartridge,
Seal on the inner circumference of the case, and the engaging projection engaged with the holding portion for locking holding the filter cartridge within the case, wherein the sealing ring in engagement holding state of the filter cartridge are joined A surface is formed ,
The holding portion is a flange portion formed on the inner periphery of the case,
The flange portion is formed with a recess through which the engagement protrusion can pass along the axial direction of the case,
After the engagement protrusion has passed through the recess, the flange portion is sandwiched between the engagement protrusion and the seal ring by rotating the filter cartridge about its axis.
The filter device is characterized in that the seal surface is formed on one side surface of the flange portion and on the outer peripheral side of the concave portion over the entire circumference, and the lip portion of the seal ring is joined. . The filter cartridge is composed of a filter element and a ring member provided on one end outer periphery of the filter element,
The engaging projection, together are formed on the outer periphery of the ring member, the seal ring, the filter device according to claim 1, characterized in that it is fitted on the outer periphery of the ring member. The engaging projection and the flange portion, the filter device according to claim 1 or 2, characterized in that the filter cartridge is provided with locking means for locking the holding state with respect to the flange portion. The engaging protrusion and the flange, either one of claims 1 to 3, characterized in that said filter cartridge is provided with a confirmation means that to be able to check the state of being arranged in a defined position relative to the flange portion filter apparatus according to one paragraph or. The filter cartridge which has the structure described in any one of Claims 1-4 .

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