JP3671278B2 - Fluid filter - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fluid filter for filtering a fluid such as oil, and further relates to a fluid filter provided with a detachable filter element.
[0002]
[Prior art]
Since the lubricating oil used in various machines and the hydraulic oil in the hydraulic circuit of industrial hydraulic equipment are contaminated by use, it is necessary to appropriately filter. These oil filters used for filtration of hydraulic oil or the like are provided in the middle of the hydraulic circuit piping or connected to the end of the return side piping and installed in the oil tank. A filter element having a filter medium for filtering oil is provided in the oil filter. However, since this filter element needs to be replaced every predetermined time, the filter element should be easily replaced. There have been proposed various oil filters that can be used.
[0003]
For example, Japanese Patent Application Laid-Open No. 6-327909 discloses a capsule-type filter device for liquid as an oil filter disposed in the middle of a return side pipe.
In this filter device, a hydraulic oil inflow hole and a filtered hydraulic oil outflow hole are formed at the bottom of a detachable filter element, and a self-closing valve is provided in each of the inflow hole and the outflow hole. Thus, the hydraulic oil accumulated in the filter element when the filter element is removed can be easily exchanged without spilling outside to contaminate the surroundings.
[0004]
[Problems to be solved by the invention]
However, in such a filter device, the bottom valve closes in a state where the filter element is filled with residual hydraulic oil. Therefore, as the filter element increases in size, the weight of the element increases when the filter element is removed. There is a problem that it becomes difficult.
In addition, the valve closing mechanism provided in the filter element is configured to include a valve seat moving mechanism, a spring, and the like, which increases the weight of the filter element itself and increases the manufacturing cost. is there. In particular, since the filter element is periodically replaced and discarded, there is a strong demand for it to be inexpensive and easy to discard. However, in the case of the above filter element, a non-combustible material such as a spring is used in part. Therefore, there is a problem that a residue is generated even when incinerated, and the filter element cannot be completely discarded by incineration.
[0005]
The present invention has been made in view of such a problem, and the filter element can be easily replaced by reducing the weight of the filter element to be replaced, and the internal fluid spills out during the replacement. An object of the present invention is to provide an inexpensive fluid filter that does not pollute the surroundings and is easy to dispose of.
[0006]
[Means and Actions for Solving the Problems]
In order to achieve the above object, in the fluid filter of the present invention, a case part is formed in a bottomed cylindrical shape with a case part discharge hole at the bottom, and a hollow pipe having a flow hole on the side surface is discharged into the case part. It extends from the hole upward. The filter element is inserted into the case through the upper opening and attached to the case, and the filter element is formed in a bottomed cylindrical shape having an element part discharge hole formed so that a hollow pipe can pass through the bottom part. Yes. A hollow pipe protrudes from the element part discharge hole into the inner circumferential space of the filter element, and a lid member configured to be detachable with respect to the upper end part of the hollow pipe and the element part discharge hole is arranged in the filter element. Has been established.
[0007]
According to the fluid filter configured as described above, in a state where the filter element is mounted in the case, the fluid filtered through the filter medium in the filter element is formed on the side surface of the hollow pipe. After passing, it is discharged from the case part discharge hole through the element part discharge hole. And in the state which removed the filter element, since the element part discharge hole is block | closed by the cover member, the fluid which remained in the element does not leak outside. Here, by adjusting the length of the hollow pipe and the mounting position of the fluid filter, the amount of residual fluid in the filter element can be adjusted when the filter element is pulled out, and the weight of the filter element to be replaced can be adjusted.
[0008]
In addition, a reinforcing plate in which a through hole penetrating vertically and a lid member locking portion is formed in the inner circumferential space of the filter element is provided so that the outer circumference is joined to the inner circumferential surface of the filter element, thereby reinforcing the lid member. In the unused state before the filter element is mounted in the case, the lid member is formed in a state in which the lid member is locked to the lid locking portion. You may comprise so that it may be arrange | positioned in a filter element.
According to the fluid filter configured as described above, the strength of the filter element can be increased without hindering the flow of fluid from the outer peripheral space to the inner peripheral space of the filter element, and the lid member can be easily attached to the filter element. Can be disposed within.
Here, the lid engaging portion is formed as a lid member fitting hole formed through the reinforcing plate, and a reinforcing plate fitting projection is formed on the upper surface of the lid member so as to be fitted into the lid member fitting hole. In this case, the lid member can be more easily disposed in the filter element.
[0009]
In addition, when the cover member is arranged in the filter element in the unused state before the filter element is mounted in the case, the cover member is mounted so as to cover the element portion discharge hole. The configuration of the filter element can be simplified, and a lid member can be disposed in the filter element.
[0010]
Further, a reinforcing plate in which a through hole penetrating vertically is formed in the inner peripheral space of the filter element so that the outer periphery is joined to the inner peripheral surface of the filter element, and the filter element is mounted in the case In this case, if the lid member is attached to the upper end of the hollow pipe and the upper surface of the lid member is positioned near the lower surface of the reinforcing plate, the lid member can be Since it is pressed, it is possible to prevent the lid member from falling off.
[0011]
If at least the fitting part of the lid member with the hollow pipe and the element part discharge hole is formed of an elastic material, the element part discharge hole along the outer periphery of the hollow pipe is obtained by pulling the filter element upward and removing the filter element. After the lid moves upward and the lid member is fitted into the element part discharge hole, the lid member can be detached from the tip of the hollow pipe, so that the filter element can be removed simultaneously by performing the removal operation of the filter element. The bottom can be closed.
[0012]
And if a filter element is formed with a combustible material, the used filter element can be incinerated. The flammable material is preferably a material such as flammable plastic, flammable furnace paper, or flammable rubber. These materials may be used alone, or may be a composite or a mixture of these materials.
[0013]
In addition, if the handle for attaching / detaching the filter element is detachably provided on the upper part of the filter element, the filter element can be easily attached to / detached from the case, and this handle can also be used as a cover for covering the upper surface of the filter element. If configured so that dust can enter from inside the filter element when the filter element is not used, residual fluid inside the filter element can be prevented from splashing out during replacement. You can also
[0014]
【Example】
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
First, an oil filter (return filter) 1 that is connected to an end of a return side pipe in a hydraulic circuit and that is installed in an oil tank 50 and filters hydraulic oil will be described with reference to FIG.
The oil filter 1 includes a case portion 10 and a filter element 20 disposed in the case portion 10. The case portion 10 is provided so as to be detachable from the case main body 11 while covering the case main body 11 formed in a cylindrical shape, a bottom plate 12 closing the lower end face of the case main body 11, and the upper end face of the case main body 11. The case lid 13 is constituted. The case main body 11, the bottom plate 12, and the case lid 13 are made of a non-ferrous metal such as an aluminum alloy or a metal material such as iron.
[0015]
A hollow pipe insertion hole 12a is formed at the center of the bottom plate 12, and a hollow pipe 14 formed in a cylindrical shape extends upward (inside the case body) into the hollow pipe insertion hole 12a. Has been. A plurality of hollow pipe circulation holes 14 a are formed on the side surface of the hollow pipe 14, so that hydraulic oil can freely flow from the outer peripheral side to the inner peripheral side of the hollow pipe 14.
[0016]
A flange 11c is formed at the upper end of the case body 11, and an O-ring 31 is disposed on the flange 11c. A case lid 13 can be placed on the upper surface of the flange 11c (on the O-ring 31), and the case lid 13 is firmly attached to the case main body 11 by a fixing screw (not shown) so that no oil leaks. .
[0017]
The case lid 13 is provided with a relief valve assembly 16 and a filter presser 17. The relief valve assembly 16 is attached to a support shaft 16 a that is slidable in the vertical direction with respect to the filter retainer 17, a spring receiver 16 b that is attached to the upper end of the support shaft 16 a, and the case lid 13. The assembly case 16d, and a relief valve spring 16c disposed in the assembly case 16d and having a biasing force for pulling the support shaft 16a upward together with the spring receiver 16d.
The assembly case 16d may be configured to be detachable from the case lid 13 using screws or pins.
[0018]
The filter retainer 17 is for retaining the filter element 20, which will be described in detail later, so as not to move in the case portion 10. The filter retainer 17 has a disc shape and a center portion protruding upward. A relief hole 17a for allowing relief oil to flow is formed on the side surface of the protruding portion. The lower surface of the protruding portion is formed so that the relief valve 15 fixed to the support shaft 16a is fitted, and the relief valve 15 is always in close contact with the filter presser 17 by the urging force of the relief valve spring 16c. The hole 17a and the inner circumferential space S2 of the filter element 20 are configured not to flow.
Between the filter retainer 17 and the case lid 13, a filter retainer spring 18 is also provided for urging the filter retainer 17 downward to retain the filter element 20 when the filter element 20 is attached.
[0019]
The case portion 10 configured as described above is attached to the oil tank 50 using an attachment flange 11b formed in a ring shape on the outer periphery of the case body 11, and an O-ring 32 is provided on the lower surface of the flange 11b. Therefore, the oil in the oil tank 50 does not leak from the mounting portion.
[0020]
Next, FIG. 2 and FIG. 3 are added and the filter element 20 arrange | positioned detachably in the case part 10 in order to filter return oil is demonstrated. The filter element 20 includes an outer cylinder 21, an inner cylinder 23 disposed inside the outer cylinder 21, a cylindrical filter medium 22 disposed on the outer periphery of the inner cylinder 23, and an upper portion of the outer cylinder 21. The upper end plate 27 is fixed to the end surface, the lower end plate 28 is fixed to the lower end surface of the outer cylinder 21, and the handle 29 is configured to be detachable from the upper end plate 27.
[0021]
The outer cylinder 21, the inner cylinder 23, the upper end plate 27, the lower end plate 28, and the handle 29 are formed so as to be incinerated with a combustible resin material such as plastic or paper. The outer cylinder 21 is also referred to as a shell, and the outer cylinder 21, the inner cylinder 23, the upper end plate 27, the lower end plate 28, and the like in which the filter medium 22 is covered is also referred to as a shell pack.
[0022]
The outer cylinder 21 is formed in a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the case main body 11, and a ring shape formed with an outer diameter in contact with the inner periphery of the case main body 11 at an upper end portion thereof. A seal 33 is provided.
The lower end plate 28 is provided with an element part discharge hole 25 having a through hole formed at the center. The element portion discharge hole 25 is formed with a fitting protrusion 25a on the inner peripheral surface, which can be fitted to the outer peripheral side of a cap (lid member) 26, the details of which will be described later.
[0023]
The filter medium 22 is formed in a cylindrical shape with an outer diameter smaller than the inner diameter of the outer cylinder 21 so that a predetermined outer peripheral space S1 is formed with respect to the inner peripheral surface of the outer cylinder 21, and the inner peripheral surface is the inner surface. It is mounted so as to come into contact with the outer periphery of the cylinder 23. The filter medium 22 is formed by forming plate-shaped filter paper into a pleated shape (chrysanthemum shape) with a predetermined width, or having a predetermined thickness using filter paper, glass fiber, nonwoven fabric, or the like.
[0024]
The inner cylinder 23 is formed in a cylindrical shape, and a plurality of inner cylinder flow holes 23a are formed on the side surface thereof. An intermediate plate (reinforcing plate) 24 whose outer periphery is joined to the inner peripheral surface of the inner cylinder 23 is formed in the vicinity of the intermediate portion in the vertical direction of the inner cylinder 23. The intermediate plate 24 is provided to increase the strength of the inner cylinder 23, and is provided to dispose (hold) a cap 26, which will be described in detail later, in the lower inner circumferential space S3 of the filter element 20. Further, a plurality of intermediate plate flow holes 24 b are formed on the outer peripheral side of the intermediate plate 24 (inner peripheral side of the inner cylinder 23).
[0025]
The handle 29 includes a disc-shaped lid portion 29a formed with a diameter slightly smaller than the outer diameter of the outer cylinder 21, a grip portion 29b formed extending upward from the lid portion 29a, and a lower surface of the lid portion 29a. And a plurality of hook portions 29c, 29c formed to project.
[0026]
The upper end plate 27 has a through hole having the same size as the inner diameter of the inner cylinder 23 and is formed in a ring shape, and the element part flows into the outer peripheral side (the side fixed to the outer cylinder 21). A hole 27a is formed. The element portion inflow hole 27a is a plurality of long holes formed concentrically with the upper end plate 27. The hook portion 29c of the handle 29 can be inserted therein, and the handle 29 can be inserted with the hook portion 29c inserted. The handle 29 and the upper end plate 27 are formed so as to engage with each other by turning in the horizontal direction.
In a state where the handle 29 is attached, the upper surface of the filter element 20 is covered with the lid portion 29a, so that intrusion of dust or the like can be prevented.
[0027]
The cap 26 is made of an elastic material such as rubber, plastic, or synthetic resin, and is preferably flammable. The cap 26 includes a disc-shaped lid portion 26a, a fitting portion 26b formed to extend downward from the lid portion 26a, and an intermediate plate fitting portion 26e formed to extend above the lid portion 26a. It is configured.
[0028]
The cap 26 is formed in the element part discharge hole 25 so as to be freely detachable from above (the inner peripheral side of the filter element 20). When the cap 26 is inserted from above, the fitting part 26b is elastically deformed to the outer periphery of the fitting part 26b. The formed outer protrusion 26 c and the element part protrusion 25 a formed on the inner periphery of the element part discharge hole 25 can be fitted.
[0029]
When the cap 26 is engaged with the element portion discharge hole 25, the outer peripheral end portion 26 g of the lid portion 26 a comes into contact with the upper end surface of the element portion discharge hole 25. I will not be depressed.
Further, in order to release the fitting between the outer projection 26c and the element projection 25a, the cap 26 must be lifted upward (by pushing up from below) with a force that elastically deforms the fitting portion 26b again. The cap 26 does not come off the element part discharge hole 25 due to the influence of the residual oil.
Thereby, when the cap 26 is fitted to the element part discharge hole 25, the upper opening surface of the element part discharge hole 25 is firmly covered, and the oil accumulated in the filter element 20 flows out from the element part discharge hole 25. Absent.
[0030]
The cap 26 is configured to be detachable from the distal end portion of the hollow pipe 14. An inner protrusion 26 d is formed on the inner periphery of the cap 26, and a fitting protrusion 14 b is formed on the upper end portion of the hollow pipe 14 so as to have a diameter slightly larger than the outer diameter of the hollow pipe 14. Therefore, the cap 26 and the hollow pipe 14 inserted from below the cap 26 are configured to be fitted.
[0031]
Further, the cap 26 is configured to be freely inserted into and removed from the intermediate plate 24. This insertion and removal is performed from the lower side (element part discharge hole 25) side of the intermediate plate 24. An intermediate plate fitting portion 26e formed on the upper surface of the cap 26 is formed so as to be insertable into a cap fitting hole 24a formed in the central portion of the intermediate plate 24, and at the outer periphery of the upper end portion, the cap fitting hole 24a. The upper protrusion 26f is formed so as to have a diameter slightly larger than the inner diameter dimension of the upper protrusion 26f.
[0032]
Thus, when the cap 26 is inserted from below the intermediate plate 24, the intermediate plate fitting portion 26e is elastically deformed so that the upper protrusion 26f penetrates the cap fitting hole 24a, and the upper protrusion 26f is formed on the upper surface of the intermediate plate 24. The cap 26 is locked to the intermediate plate 24. Note that the cap 26 can be removed from the intermediate plate 24 by pulling it down again with a force that causes the intermediate plate fitting portion 26e to elastically deform.
[0033]
A case where return oil is filtered by the oil filter 1 configured as described above will be described. First, a procedure for attaching the filter element 20 to the case portion 10 will be described.
The filter element 20 before being attached to the case portion 10 (unused state) is in a state in which a handle 29 is attached to the upper end plate 27 as shown by a solid line in FIG. In addition, dust does not enter the filter element 20 from above.
Further, the cap 26 is fitted into the element portion discharge hole 25 as indicated by a solid line, or attached to the intermediate plate 24 as indicated by a chain line.
[0034]
First, a case where the filter element 20 attached to the intermediate plate 24 as shown by a chain line is attached to the case portion 10 will be described.
Since the attachment to the case part 10 is performed from the upper opening of the case main body 11, first, the fixing screw is removed and the case lid 13 is removed. Since the relief valve assembly 16 and the filter retainer 17 are attached to the case lid 13, if the case lid 13 is removed, the upper opening of the case body 11 is opened. When the operator grasps the handle 29 and inserts the filter element 20 straight into the case main body 11 from above the case main body 11, the filter element 20 is inserted into the case portion discharge hole 25 in the state where the hollow pipe 14 is inserted into the case main body 11. Mounted in the main body 11. Here, the length of the hollow pipe 14 is slightly shorter than the dimension obtained by subtracting the thickness of the lid portion 26a from the dimension from the upper surface of the bottom plate 12 to the lower surface of the intermediate plate 24 when the filter element 20 is mounted. Has been.
Thereby, after the fitting projection 14b of the hollow pipe 14 abuts against the inner projection 26d, if the filter element 20 is pushed in until it abuts against the upper surface of the bottom plate 12, the cap 26 is fitted to the tip of the hollow pipe 14. It becomes.
[0035]
After fitting the cap 26 to the tip of the hollow pipe 14, the handle 29 is rotated in the horizontal direction to disengage the hooks 29c, 29c from the upper end plate 27, and is shown by a chain line in FIG. Remove the handle 29 as shown.
After the filter element 20 with the handle 29 removed is attached, the case lid 13 is again attached to the case main body 11, and the filter presser 17 that is biased downward by the ineffective force of the filter presser spring 18 causes the case to It is firmly held in the part 10.
[0036]
Next, the flow of return oil filtered by the oil filter 1 to which the filter element 20 is mounted as described above will be described with reference to FIG. 1 again. In FIG. 1, the oil flow is represented by an arrow A.
The oil that flows in from the inflow hole 11 a formed in the upper side surface of the case body 11 flows into the filter element 20. Here, since the relief valve 15 is normally in close contact with the filter retainer 17, it passes through the upper surface of the filter retainer 17 and the element portion inflow hole 27a after the hook portion 29c is removed. Flow into. Since oil always flows on the upper surface of the relief valve 15, dust in the oil does not accumulate on the relief valve 15.
Further, the unfiltered oil is not discharged out of the oil filter 1 (flows into the oil tank 50) by the seal 33 on the upper end plate 27.
[0037]
The oil that has flowed into the outer peripheral space S1 flows from the outside to the inside of the filter medium 22, and at this time, impurities such as dust mixed in the oil are filtered. The filtered oil flows into the upper inner circumferential space S2 and the lower inner circumferential space S3 through the inner cylinder circulation hole 23a of the inner cylinder 23. In addition, since the inner periphery is in contact with the outer periphery of the inner cylinder 23, the filter medium 22 does not deform even when oil flows in from the outer periphery direction.
The oil that has flowed into the upper inner circumferential space S2 flows into the lower inner circumferential space S3 from the intermediate plate inflow hole 24b, and then flows into the hollow pipe 14 from the hollow pipe circulation hole 14a, and then the lower discharge hole 14c. To the outside of the oil filter 1.
[0038]
As described above, the outer cylinder 21 is formed of resin or the like with an outer diameter slightly smaller than the inner diameter of the case body 11. For this reason, the force in the direction of expanding from the inside by the pressure of the oil flowing in from the inflow hole 11 a acts on the outer cylinder 21, and the outer periphery of the outer cylinder 21 swells outward, but the outer cylinder 21 is the inner periphery of the case body 11. By abutting and contacting the surface, the pressure acting on the outer cylinder 21 can be received by the case body 11 that is firmly formed of a metal material.
Accordingly, the strength of the outer cylinder 21 itself may be small, and it is not necessary to increase the thickness of the outer cylinder 21, so that the weight of the filter element 20 itself can be reduced.
[0039]
When the filter medium 22 is clogged, the pressure loss of the filter medium 22 increases, and the oil flowing from the inflow hole 11a cannot smoothly flow through the filter medium 22. For this reason, a force greater than the urging force of the relief valve spring 16 c acts on the relief valve 15, and the relief valve 15 is pushed downward as shown by a chain line to create a space between the relief valve spring 16 c and the filter presser 17. As a result, as shown by A ′, the oil flows into the upper space S2 from the relief hole 17a without passing through the filter medium 22, and is discharged out of the oil filter 1 from the lower end discharge hole 14c. We are going to prevent damage.
[0040]
In the oil filter 1 configured as described above, the filter medium 22 is clogged when used for a long time. Therefore, it is necessary to replace the filter element 20 every predetermined time. The reverse procedure is performed.
When the case lid 13 is removed to replace the filter element 20, the inside of the case portion 10 is at atmospheric pressure, so that the oil in the case portion 10 falls to the oil level L1 in the oil tank 50. At this time, oil in the case portion 10 (oil above the relief valve 15) flows into the filter element 20, so that unfiltered oil may be discharged out of the oil filter 1 from the discharge hole 14c at the lower end. Absent.
[0041]
Thereafter, the operator grasps and lifts the handle 29 attached to the filter element 20, thereby lifting the filter element 20 upward. Here, the fitting force of the cap 26 to the intermediate plate 24 is configured to be weaker than the fitting force of the cap 26 to the hollow pipe 14. For this reason, when the filter element 20 is pulled upward, the cap 26 is detached from the intermediate plate 24 while being fitted to the hollow pipe 14.
[0042]
When the filter element 20 is further lifted, the cap 26 is fitted into the element part discharge hole 25, and the element part discharge hole 25 is blocked by the cap 26. Further, by further lifting the filter element 20, the fitting between the hollow pipe 14 and the cap 26 is released, so that the filter element 20 can be separated from the case portion 10.
Thus, even when the cap 26 in the filter element 20 once attached to the case portion 10 is not attached to the case portion 10, the cap 26 of the filter element 20 in the unused state is arranged. It will be different from the installation position. For this reason, if the bottom face of the filter element 20 is observed, it can be easily determined whether or not the filter element has been used once.
[0043]
Here, when the oil level in the oil tank 50 is L1, the cap 26 is closed when the element portion discharge hole 25 rises to the position L0 (the position of the cap 26). At this time, only the oil corresponding to the difference H between L1 and LO is accumulated in the filter element 20 and the filter element 20 is not filled with oil, so that the filter element 20 to be removed can be lightened. At the same time, residual oil does not leak from the element portion discharge hole 25.
In addition, since the upper part of the filter element 20 is covered with the lid portion 29a of the handle 29, the residual oil in the replaced filter element 20 will not splash and get on the operator or contaminate the surroundings.
[0044]
If the initial level of oil is set to a level L2 below the position of the cap 26, or if the hollow pipe 14 is formed long so that the cap 26 is positioned above the level L1, the oil level at the time of replacement Residual oil in the filter element 20 can be eliminated and replacement is facilitated.
Moreover, since the filter element 20 is formed of a combustible material, the replaced filter element 20 can be incinerated. Furthermore, since the filter element 20 to be incinerated does not require a mechanism such as a spring or a sliding shaft that closes the element discharge hole 25 by the cap 26, the disposable filter element 20 can be manufactured at low cost. it can.
[0045]
In the above embodiment, the cap 26 is disposed in the filter element 20 by inserting the intermediate plate fitting portion 26e formed on the upper surface of the cap 26 into the cap fitting hole 24a of the intermediate plate 24. However, the present invention is not limited to this, and a fitting protrusion (claw) that can be fitted to at least a part of the outer peripheral surface of the cap 26 is formed on the lower surface of the intermediate plate 24. You may comprise so that the cap 26 may be arrange | positioned in the filter element 20 by carrying out fitting holding of the cap 26 to this fitting protrusion. Therefore, in this case, the intermediate plate fitting portion 26e is not necessary. Moreover, you may comprise so that the said fitting protrusion may be fitted and hold | maintained to the intermediate | middle board fitting part 26e, without making the intermediate | middle board fitting part 26e unnecessary.
[0046]
As described above, when the cap 26 is arranged in the middle portion of the filter element 20, the outer cylinder 21 is formed when the cap 26 is formed of flammable rubber or the like that is easily affected by heat. Even when the lower end plate 28 is fixed to the lower end surface of the metal plate by welding, the heat at the time of welding does not act on the cap 26, so that the cap 26 is not adversely affected.
[0047]
Next, as shown by a solid line in FIG. 2, the case where the filter element 20 is mounted from the state where the cap 26 is fitted in the element portion discharge hole 25 will be described.
Also in this case, the filter element 20 is inserted into the case portion 10 from the upper opening of the case body 11 in the same manner as described above. For this reason, when the filter element 20 is inserted, first, the cap 26 is fitted to the tip of the hollow pipe 14. When the filter element 20 is pushed down in this state, the cap 26 and the element portion discharge hole 25 are disengaged from each other, and insertion until the bottom surface of the filter element 20 comes into contact with the bottom surface of the case body 11 is possible.
[0048]
When the bottom surface of the filter element 20 is in contact with the bottom surface of the case body 11, the intermediate plate fitting portion 26e penetrates the cap fitting hole 24a. Then, by adjusting the length of the hollow pipe 14 and the position of the intermediate plate 24 so that the upper surface of the lid portion 26a contacts the lower surface of the intermediate plate 24, an external force such as oil flow or vibration of the oil tank 50 can be obtained. It is possible to prevent the cap 26 from being inclined with respect to the distal end portion of the hollow pipe 14 or coming off from the distal end portion.
[0049]
In the present embodiment, the upper surface of the lid portion 26a and the lower surface of the intermediate plate 24 are brought into contact with each other. However, the cap 26 is not necessarily in contact with each other, and the cap 26 is inclined with respect to the distal end portion of the hollow pipe 14. However, it may be configured to have a slight gap as long as it does not come off from the tip.
Further, as indicated by the chain line, only the cap 26 is not locked to the intermediate plate 24, and therefore it is not always necessary to form the upper protrusion 26f, and the length of the intermediate plate fitting portion 26e is also equal to the thickness of the intermediate plate 24. There is no need to adjust strictly. Furthermore, it is not necessary to adjust the inner diameter of the cap fitting hole 24a to be slightly larger than the outer diameter of the intermediate plate fitting portion 26e, and it is sufficient that the cap fitting hole 24a is formed smaller than the diameter of the lid portion 26a.
[0050]
The intermediate plate 24 is not necessarily provided with a locking portion such as the cap fitting hole 24a, and the intermediate plate 24 may be provided with only the intermediate plate inflow hole 24b. When such an intermediate plate 24 is provided, it is not necessary to form the intermediate plate fitting portion 26e and the upper protrusion 26f, and the cap 26 is attached to the distal end portion of the hollow pipe 14 in the state where the lid portion 26a is attached. The upper surface and the lower surface of the intermediate plate 24 may be in contact with each other, or the cap 26 may be configured with a slight gap so that the cap 26 is not inclined with respect to the distal end portion of the hollow pipe 14 or detached from the distal end portion.
In this case, it is preferable that the shape of the upper surface of the lid portion 26a of the cap 26 is a gentle convex shape so that oil flows smoothly.
[0051]
Further, if the flow rate and vibration of the oil flowing in the filter element 20 are small, the cap 26 is not likely to come off from the hollow pipe 14, and the strength of the filter medium 22 is sufficient, the intermediate plate 24 and the intermediate plate fitting portion 26e is not necessarily required.
[0052]
According to the filter element 20 configured as described above, the upper element portion inflow hole 27a is blocked by the handle 29 and the element portion discharge hole 25 is blocked by the cap 26. In the state before mounting, dust or the like does not enter from the upper side of the filter element 20 as well as the lower side.
[0053]
Furthermore, even if there is a slight shift in the position of the cap fitting hole 24a formed in the center of the intermediate plate 24, it can be allowed to be configured, or the intermediate plate 24 and the cap 26 can be configured not to be fitted. Therefore, the case portion 10 (particularly the formation position and length of the hollow pipe 14) can be easily manufactured, and the filter element 20 (particularly the position of the intermediate plate 24, the position of the cap fitting hole 24a, and the inner diameter) can be obtained. Manufacture is also easy. For this reason, since the oil filter 1 can be manufactured at a lower cost and the hollow pipe 14 and the cap 26 can be easily fitted, the filter element 20 can be easily attached to the case portion 10. It can be carried out.
[0054]
In the above embodiment, the oil filter 1 is connected to the end of the return side pipe in the hydraulic circuit with the inflow hole 11a, the case portion 10 is attached to the upper portion of the oil tank 50, and the lower end portion of the filter element 20 Although the case where the exhaust hole 14c is used as a return filter configured to be immersed in the oil in the oil tank 50 has been described, the present invention is not limited to this.
For example, as in the oil filter 4 shown in FIG. 4, an L-shaped discharge pipe 49 connected to the discharge hole 44 c is provided at the lower end of the case body 41, and mounting brackets 41 a, 41 a. An in-line filter that filters the hydraulic fluid flowing in the hydraulic circuit piping by connecting to the pipe 49 and the inflow hole 11a in the middle of the piping of the hydraulic circuit (not shown) and fixing to the wall surface or the like by mounting brackets 41a, 41a. Can also be used.
[0055]
According to the oil filter 4 configured as described above, the oil in the filter element 20 flows out from the discharge pipe 49 by removing the case lid 43. Therefore, when the filter element 20 is removed, the oil is contained in the filter element 20. Will not remain.
[0056]
Furthermore, the case lid 43 may be provided with an air vent plug 43a. According to the oil filter 4 thus configured, air in the pipe can be appropriately vented.
In addition, since it is the structure similar to the said oil filter 1 except the part demonstrated by attaching the number in the oil filter 4, each description is abbreviate | omitted.
In each of the above embodiments, the case where the fluid filter according to the present invention is used as an oil filter for filtering hydraulic oil in a hydraulic circuit has been described. However, filtration of other fluids such as water and fuel is performed. Of course, it can also be used as a filter to be performed.
[0057]
【The invention's effect】
As described above, the fluid filter according to the present invention has a lid member attached to the tip of a hollow pipe formed to extend upward from the case part discharge hole at the bottom of the case through the filter element discharge hole. Yes. And in the state which removed the filter element, it remove | deviates from a hollow pipe, and the filter element bottom part is obstruct | occluded by mounting | wearing with an element part discharge hole.
Therefore, by adjusting the length of the hollow pipe and the position of the fluid filter with respect to the level of the fluid flowing out of the fluid filter, the amount of fluid such as oil remaining inside the filter element can be adjusted when replacing the filter element. It is possible to reduce the weight of the filter element at the time of replacement. Furthermore, since the remaining fluid does not leak out of the filter element, the surroundings are not soiled during replacement.
In addition, since the pressure of the fluid acting on the filter element is received by the case where the filter element is mounted, the strength of the filter element (especially the outer cylinder) may be small. The weight of the element itself can be reduced.
[0058]
Here, when the filter element is in an unused state before being mounted in the case, the lid member disposed in the filter element is locked to the reinforcing plate joined to the inner peripheral surface of the filter element. In this case, even when the bottom surface of the filter element is heated during the assembly of the filter element, it is not affected by the heat. In addition, when the filter element is in an unused state and the cover member disposed in the filter element is mounted so as to cover the element portion discharge hole, dust from below the filter element in the unused state Intrusion of the filter element can be prevented, and when the filter element is attached to the case portion, the hollow pipe and the lid member can be easily fitted, so that the filter element can be easily attached to the case. Can do.
[0059]
Here, in the case where at least the fitting portion of the lid member with the hollow pipe and the element portion discharge hole is formed of an elastic material and is configured to be freely fitted to the hollow pipe and the element portion discharge hole, the filter element is When the operation of removing the filter element by pulling upward is performed, the lid member is detached from the tip of the hollow pipe and fitted into the element part discharge hole, so that the filter element can be easily replaced. Further, since it is not necessary to provide a mechanism for closing the element portion discharge hole with the lid member, the filter element to be replaced can be manufactured at low cost.
[0060]
In addition, since it can incinerate if a filter element is formed with a combustible material, the process of the filter element after use can be performed easily.
In addition, since the filter element can be easily attached to and detached from the case by providing a detachable handle on the top of the filter element, the filter element can be replaced more easily. .
Furthermore, if this handle can also be used as a cover that covers the upper surface of the filter element, it is possible to prevent dust from entering the filter element when not in use, and at the time of replacement, The residual fluid does not splash outside, so the surroundings of the fluid filter and the clothes of the operator are not soiled.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an oil filter which is an example of a fluid filter according to the present invention.
FIG. 2 is a side sectional view showing a filter element attached to the oil filter.
FIG. 3 is a partial cross-sectional view showing the filter element.
FIG. 4 is a side cross-sectional view showing another oil filter according to the present invention.
[Explanation of symbols]
1,4 Oil filter
11, 41 Case body
14 Hollow pipe
20 Filter elements
25 Element part discharge hole
26 Cap (lid member)
29 Handle

Claims (9)

A case formed in a bottomed cylindrical shape with a case part discharge hole at the bottom;
A hollow pipe extending upward from the case part discharge hole and having a flow hole on the side surface;
The bottom part has an element part discharge hole formed so that the hollow pipe can pass therethrough and is formed in a bottomed cylindrical shape, and is inserted into the case from the upper opening of the case, and the element part discharge hole A hollow pipe projecting into the inner space, and a filter element attached to the case;
A lid member disposed in the filter element and configured to be detachable with respect to an upper end portion of the hollow pipe and the element portion discharge hole;
In the state where the filter element is mounted in the case, the lid member is mounted on the upper end portion of the hollow pipe, and the fluid introduced into the outer peripheral space formed on the outer peripheral side in the filter element is the filter element. After passing through the filter medium disposed therein and filtering, the fluid is discharged from the case portion discharge hole to the outside through the flow hole of the hollow pipe protruding into the inner peripheral space of the filter element,
In the state where the filter element is removed from the case, the lid member is detached from the hollow pipe and attached to the element part discharge hole to close the bottom of the filter element. In the inner peripheral space of the filter element, a flow hole penetrating vertically is formed, a lid member locking portion is formed, and a reinforcing plate whose outer periphery is joined to the inner peripheral surface of the filter element is provided,
The lid member is detachably formed with respect to the lid member locking portion,
In an unused state before the filter element is mounted in the case, the lid member is locked to the lid member locking portion, and the lid member is disposed in the filter element. The fluid filter according to claim 1. The lid member locking portion is a lid member fitting hole formed through the reinforcing plate,
The fluid filter according to claim 2, wherein a reinforcing plate fitting protrusion that can be fitted into the lid member fitting hole is formed on an upper surface of the lid member. The lid member is mounted in the filter element so as to cover the element part discharge hole in an unused state before the filter element is mounted in the case. The fluid filter according to 1. In the inner circumferential space of the filter element, there is provided a reinforcing plate in which a flow hole penetrating in the vertical direction is formed and the outer periphery is joined to the inner circumferential surface of the filter element,
In the state where the filter element is mounted in the case, the lid member is mounted on the upper end of the hollow pipe, and the upper surface of the lid member is positioned near the lower surface of the reinforcing plate, The fluid filter according to any one of claims 1 to 4, wherein the lid member is prevented from falling off. At least the fitting portion of the lid member with the upper end portion of the hollow pipe and the fitting portion with the element portion discharge hole are formed of an elastic material, and when the filter element is removed, the filter element is pulled upward The element part discharge hole moves upward along the outer periphery of the hollow pipe and the cover member is fitted to the element part discharge hole, and then the cover member is detached from the tip of the hollow pipe. The fluid filter according to any one of claims 1 to 5. The fluid filter according to any one of claims 1 to 6, wherein the filter element is made of a combustible material. The fluid filter according to any one of claims 1 to 7, wherein a handle for attaching and detaching the filter element is detachably disposed on an upper portion of the filter element. The fluid filter according to claim 8, wherein the handle for attaching and detaching the filter element also serves as a lid that covers an upper surface of the filter element.

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