JPH08192004A - Fluid filter - Google Patents

Abstract

PURPOSE: To obtain a fluid filter in which a filter element is easily replaced and a fluid inside a filter is kept from spilling to the outside to soil the surroundings with it and also the element is easily disposed of and which is inexpensive by reducing the weight of the filter element to be replaced. CONSTITUTION: A case 11 is formed into a blind cylinder, and also a hollow pipe 14 having flow holes 14a on the side face is arranged extending upwards from a hollow pipe inserting hole 12a. A filter element 20 is inserted into the case 11 from the upper opening thereof and fitted. The filter element 20 is formed into a blind cylinder, having an element part discharge hole 25 formed so that the hollow pipe 14 can be passed through a lower end plate 28. The hollow pipe 14 is projected from the element part discharge hole 25, and in the filter element 20, a cap 26 freely attachable and detachable to the upper end part of the hollow pipe 14 and the element part discharge hole 25 is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid filter for filtering a fluid such as oil, and more particularly to a fluid filter provided with a detachable filter element.

[0002]

2. Description of the Related Art Lubricating oils used in various machines and hydraulic oils in hydraulic circuits of industrial hydraulic equipment must be appropriately filtered because impurities are mixed in during use. The oil filter used for filtering these operating oils or the like is provided in the middle of the hydraulic circuit pipe, or is connected to the return side pipe end and mounted in the oil tank. A filter element having a filter material for filtering oil is provided in the oil filter, but this filter element needs to be replaced every predetermined time, so this filter element can be easily replaced. Various oil filters have been proposed that are capable of achieving the above.

For example, Japanese Patent Laid-Open No. 6-327909 discloses a liquid capsule-type filter device as an oil filter arranged in the return pipe. In this filter device, an inflow hole for operating oil and an outflow hole for filtered operating oil are formed in the bottom of a removable filter element, and a self-closing valve is provided in each of these inflow hole and outflow hole. This makes it possible to easily replace the filter element without the operating oil accumulated in the filter element spilling to the outside when the filter element is removed and polluting the surrounding area.

[0004]

However, in such a filter device, since the valve at the bottom is closed while the filter element is filled with the residual hydraulic oil, the weight of the element when removing it as the filter element becomes larger. Is large and it becomes difficult to replace the filter element. Further, since the valve closing mechanism provided in the filter element is configured to have a valve seat moving mechanism, a spring, and the like, there is a problem that the weight of the filter element itself increases and the manufacturing cost also increases. is there. In particular, since the filter element is regularly replaced and discarded, there is a strong demand for it to be inexpensive and easy to discard, but 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.

The present invention has been made in view of the above problems. The weight of the filter element to be replaced can be reduced so that the filter element can be easily replaced. It is an object of the present invention to provide a fluid filter which does not spill and stain the surroundings, is easy to dispose of, and is inexpensive.

[0006]

In order to achieve the above object, in the fluid filter of the present invention, a case-shaped discharge hole is formed in the bottom to form a case having a bottomed cylindrical shape, and the side surface is formed. A hollow pipe having a flow hole is arranged so as to extend upward from the case portion discharge hole. The filter element is inserted into the case through the upper opening and mounted in this case, and the filter element has a bottomed tubular shape with an element portion discharge hole formed through which a hollow pipe can penetrate. There is. From the element part discharge hole, project the hollow pipe into the inner peripheral space of the filter element,
Inside the filter element, a lid member that is detachably attached to the upper end portion of the hollow pipe and the element portion discharge hole is arranged.

According to the fluid filter thus constructed, 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 through the circulation hole, it is discharged from the case discharge hole through the element discharge hole. When the filter element is removed, the element portion discharge hole is closed by the lid member, so that the fluid remaining in the element does not leak out. 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.

In the inner space of the filter element, a reinforcing plate having a vertically extending through hole and a lid member locking portion is provided so that the outer circumference is joined to the inner circumferential surface of the filter element. The member is also formed so as to be attachable / detachable to / from the lid member locking portion of the reinforcing plate, and in the unused state before the filter element is mounted in the case, the lid member is locked in the lid locking portion. The lid member may be arranged in the 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 the fluid from the outer peripheral space of the filter element to the inner peripheral space, and the lid member can be easily attached to the filter element. Can be disposed within. Here, the lid locking portion is a lid member fitting hole formed by penetrating the reinforcing plate, and a reinforcing plate fitting protrusion is formed on the upper surface of the lid member so that the lid locking portion can be fitted into the lid member fitting hole. In this case, the cover member can be more easily arranged in the filter element.

Further, in the unused state before the filter element is mounted in the case, the lid member is arranged inside the filter element in a state where the lid member is mounted so as to cover the element portion discharge hole. In this case, the configuration of the filter element can be simplified, and
A lid member can be arranged in the filter element.

Further, a reinforcing plate having a vertically extending through hole is provided 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,
When the filter element is installed in the case, if the lid member is installed on the upper end of the hollow pipe and the upper surface of the lid member is located near the lower surface of the reinforcing plate, the lid member moves due to the flow of fluid or the like. However, since the lid member is pressed by the lower surface of the reinforcing plate, the lid member can be prevented from falling off.

If at least the fitting portion of the lid member for the hollow pipe and the element portion discharge hole is made of an elastic material, when the filter element is pulled out upward and the filter element is removed, the element extends along the outer circumference of the hollow pipe. After the part discharge hole is moved upward and the lid member is fitted into the element part discharge hole, the lid member can be removed from the tip portion of the hollow pipe, and therefore by performing the removal operation of the filter element, At the same time, the bottom of the filter element can be closed.

If the filter element is made of 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, and these materials may be used alone or as a composite or mixture of these materials.

If a handle for attaching and detaching the filter element is detachably provided on the upper portion of the filter element,
The filter element can be easily attached to and detached from the case, and if the handle is also used as a cover for covering the upper surface of the filter element, the filter element can be placed inside the filter element in an unused state. It is possible to prevent the invasion of dust from the inside and to prevent the residual fluid inside the filter element from splashing outside during replacement.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. First, an oil filter (return filter) 1 which is connected to an end of a return side pipe in a hydraulic circuit and which is mounted in an oil tank 50 and filters operating oil will be described with reference to FIG. The oil filter 1 includes a case portion 10 and a filter element 20 arranged in the case portion 10. The case portion 10 is a case body 1 formed in a cylindrical shape.
1, and a bottom plate 12 that closes the lower end surface of the case body 11,
It is configured by a case lid 13 which covers the upper end surface of the case body 11 and is detachably provided to the case body 11. The case body 11, the bottom plate 12, and the case lid 13 are made of a nonferrous metal such as an aluminum alloy or a metal material such as iron.

A hollow pipe insertion hole 12a is formed in the center of the bottom plate 12, and the hollow pipe insertion hole 12a is formed.
A hollow pipe 14 formed in a cylindrical shape extends upward (inside the case body) and is joined and joined thereto. A plurality of hollow pipe circulation holes 14a are formed on the side surface of the hollow pipe 14 so that the working oil can freely flow from the outer peripheral side to the inner peripheral side of the hollow pipe 14.

A flange 11 is provided on the upper end of the case body 11.
c is formed, and an O-ring 31 is provided on the flange 11c. The upper surface of the flange 11c (O
The case lid 13 can be placed on the ring 31), and the case lid 13 is firmly attached to the case body 11 by a fixing screw (not shown) so that oil does not leak.

The case lid 13 is provided with a relief valve assembly 16 and a filter retainer 17. The relief valve assembly 16 is attached to the case lid 13 and a support shaft 16a that is slidable in the vertical direction with respect to the filter retainer 17, a spring receiver 16b attached to the upper end of the support shaft 16a. It is composed of an assembly case 16d, and a relief valve spring 16c disposed in the assembly case 16d and having a biasing force for pulling up the support shaft 16a together with the spring receiver 16d. The assembly case 16d may be detachable from the case lid 13 by using screws or pins.

The filter retainer 17 is for retaining a filter element 20 which will be described in detail later so as not to move in the case portion 10, and is formed in a disk shape and has a central portion protruding upward. A relief hole 17a for allowing relief oil to flow is formed on the side surface of the projecting portion. The lower surface of the projecting portion is formed so that the relief valve 15 fixed to the support shaft 16a fits therein. The holes 17a and the inner peripheral space S2 of the filter element 20 are configured not to flow. A filter retainer spring 18 is provided between the filter retainer 17 and the case lid 13 to urge the filter retainer 17 downward to retain the filter element 20 when the filter element 20 is attached.

The case portion 10 thus constructed is attached to the oil tank 50 by using a mounting flange 11b formed in a ring shape on the outer periphery of the case body 11, and an O-ring is formed on the lower surface of the flange 11b. Since 32 is provided, the oil in the oil tank 50 does not leak from the mounting portion.

Next, referring to FIGS. 2 and 3, a description will be given of the filter element 20 which is detachably arranged in the case portion 10 for filtering the return oil. The filter element 20 includes an outer cylinder 21 and an outer cylinder 2
1, an inner cylinder 23 arranged inside 1, a cylindrical filter medium 22 arranged on the outer periphery of the inner cylinder 23, an upper end plate 27 fixed to the upper end surface of the outer cylinder 21, and an outer cylinder 21. The lower end plate 28 fixed to the lower end surface of the upper end plate 27 and the handle 29 detachably attached to the upper end plate 27.

Outer cylinder 21, inner cylinder 23, upper end plate 2
7. The lower end plate 28 and the handle 29 are formed of a combustible resin material such as plastic, paper, or the like so as to be incinerated. The outer cylinder 21 is also called 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 called a shell pack.

The outer cylinder 21 is formed in a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the case body 11, and has an outer diameter at its upper end portion that abuts and contacts the inner circumference of the case body 11. A ring-shaped seal 33 is provided. The lower end plate 28 is provided with an element portion discharge hole 25 having a through hole formed in the center thereof. The element portion discharge hole 25 has a cap (lid member) 26, the details of which will be described later.
A fitting projection 25a is formed on the inner peripheral surface of which the outer peripheral side can be fitted freely.

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 on the inner peripheral surface of the outer cylinder 21. The surface is mounted so as to come into contact with the outer circumference of the inner cylinder 23.
The filter material 22 is formed by forming a plate-like filter paper into a pleated shape (chrysanthemum shape) with a predetermined width, or a filter paper, a glass fiber, a non-woven fabric or the like having a predetermined thickness.

The inner cylinder 23 is formed in a cylindrical shape, and a plurality of inner cylinder circulation holes 23a are formed on the side surface thereof. Further, 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 an 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, the details of which will be described later, in the lower inner circumferential space S3 of the filter element 20. Further, a plurality of intermediate plate circulation holes 24b are formed on the outer peripheral side of the intermediate plate 24 (the inner peripheral side of the inner cylinder 23).

The handle 29 has a disk-shaped lid portion 29a having a diameter slightly smaller than the outer diameter of the outer cylinder 21, and a grip portion 29b extending upward from the lid portion 29a.
It is composed of a plurality of hook portions 29c, 29c formed so as to project from the lower surface of the lid portion 29a.

The upper end plate 27 is formed in a ring shape having a through hole having the same size as the inner diameter of the inner cylinder 23, and the return oil flows into the outer peripheral side (the side fixed to the outer cylinder 21). An element part inflow hole 27a is formed. The element part inflow hole 27a is a plurality of elongated holes formed concentrically with the upper end plate 27, and the hook part 29c of the handle 29 can be inserted into the element part inflow hole 27a. The handle 29 and the upper end plate 27 are formed so as to engage with each other by pivoting in the horizontal direction. And in the state where the handle 29 is attached,
Since the upper surface of the filter element 20 is covered with the lid portion 29a, it is possible to prevent dust and the like from entering.

The cap 26 is made of an elastic material such as rubber, plastic or synthetic resin and is preferably flammable. The cap 26 is a disc-shaped lid 2
6a, a fitting portion 26b extending downward from the lid portion 26a, and an intermediate plate fitting portion 26e extending upward from the lid portion 26a.

The cap 26 has an element portion discharge hole 25.
An outer projection 26c formed on the outer periphery of the fitting portion 26b by elastically deforming the fitting portion 26b when inserted from above (the inner circumference side of the filter element 20). The element projection 25a formed on the inner circumference of the partial discharge hole 25 can be fitted.

When the cap 26 is fitted in the element portion discharge hole 25, the outer peripheral end portion 26g of the lid portion 26a comes into contact with the upper end surface of the element portion discharge hole 25, so that the cap 26 is placed in the element portion discharge hole. I will never fall into 25. Further, the outer protrusion 26c and the element portion protrusion 2
In order to release the fitting with 5a, the fitting portion 26b is again used.
Since the cap 26 has to be pulled upward (pushed from below) by the force that elastically deforms the cap 26, the cap 26 may be affected by the residual oil and the element portion discharge hole 2
It does not come off from 5. As a result, when the cap 26 is fitted in 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 may flow out from the element part discharge hole 25. Absent.

The cap 26 is constructed so that it can be attached to and detached from the tip of the hollow pipe 14 as well. Cap 26
Since the inner protrusion 26d is formed on the inner periphery of the hollow pipe 14 and the fitting protrusion 14b is formed on the upper end of the hollow pipe 14 so as to have a diameter slightly larger than the outer diameter of the hollow pipe 14, The cap 26 and the hollow pipe 14 that is inserted from below the cap 26 are configured to fit together.

Further, the cap 26 is constructed so that it can be inserted into and removed from the intermediate plate 24 as well, and this insertion and removal is performed from the lower side of the intermediate plate 24 (element portion discharge hole 25). Intermediate plate fitting portion 26 formed on the upper surface of the cap 26
e is formed so that it can be inserted into a cap fitting hole 24a formed in the central portion of the intermediate plate 24, and has a diameter slightly larger than the inner diameter of the cap fitting hole 24a at the outer periphery of the upper end. The upper protrusion 26f is formed.

Thus, when the cap 26 is inserted from below the intermediate plate 24, the intermediate plate fitting portion 26e is elastically deformed and the upper protrusion 26f penetrates the cap fitting hole 24a.
The upper protrusion 26f is locked to the upper surface of the intermediate plate 24, and 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.

The oil filter 1 configured as described above
The case where the return oil is filtered will be described. First, a procedure for mounting the filter element 20 on the case portion 10 will be described. As shown by the solid line in FIG. 2, the filter element 20 before being attached to the case portion 10 (unused state) is in a state in which the handle 29 is attached to the upper end plate 27, which is easy for an operator to carry. And the filter element 20 from above
No dust will get inside. Also, the cap 26
Is fitted into the element portion discharge hole 25 as shown by a solid line, or attached to the intermediate plate 24 as shown by a chain line.

First, as shown by the chain line, the filter element 20 attached to the intermediate plate 24 is attached to the case portion 1.
The case of mounting on 0 will be described. Since the mounting on the case portion 10 is performed from the upper opening of the case body 11,
First, the fixing screw is removed to remove the case lid 13.
The case lid 13 includes a relief valve assembly 16
Since the filter holder 17 is attached, the upper opening of the case body 11 is opened when the case lid 13 is removed. Then, when the operator grasps the handle 29 and inserts the filter element 20 straight into the case body 11 from above the case body 11, the filter element 20 is inserted into the element portion discharge hole 25 with the hollow pipe 14 inserted into the case. It is mounted in the main body 11. Here, the length of the hollow pipe 14 is formed to be slightly shorter than the dimension from the upper surface of the bottom plate 12 to the lower surface of the intermediate plate 24 minus the thickness of the lid portion 26a when the filter element 20 is mounted. Has been done. As a result, the fitting protrusion 14b of the hollow pipe 14 becomes
When the filter element 20 is pushed in until it comes into contact with the upper surface of the bottom plate 12, the cap 26 is fitted to the tip portion of the hollow pipe 14.

After fitting the cap 26 to the end of the hollow pipe 14, the handle 29 is rotated in the horizontal direction to release the engagement between the hook portions 29c, 29c and the upper end plate 27, as shown in FIG. Remove the handle 29 as indicated by the dashed line. Filter element 2 with handle 29 removed
After 0 is attached, the case lid 13 is again attached to the case main body 1
When the filter holder 17 is attached to No. 1, the filter holder 17 is firmly held in the case portion 10 by the filter holder 17 which is urged downward by the inward force of the filter holder spring 18.

Next, as described above, the filter element 2
The flow of the return oil that is filtered by the oil filter 1 equipped with 0 will be described with reference to FIG. 1 again. In FIG. 1, the flow of oil is indicated by arrow A.
Represented by. The oil that has flowed in through the inflow hole 11a formed in the upper side surface of the case body 11 flows into the filter element 20. Here, since the relief valve 15 is usually in close contact with the filter retainer 17, the relief valve 15 flows through the upper surface of the filter retainer 17 and the hook 29c is removed from the element portion inflow hole 27a to the inside of the outer peripheral space S of the filter medium 22. 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 seal 33 on the upper end plate 27 prevents unfiltered oil from being discharged to the outside of the oil filter 1 (flowing into the oil tank 50).

The oil flowing into the outer peripheral space S1 flows from the outer side to the inner side of the filter medium 22. At this time, impurities such as dust mixed in the oil are filtered. The filtered oil flows into the upper inner peripheral space S2 and the lower inner peripheral space S3 through the inner cylinder circulation hole 23a of the inner cylinder 23. In addition,
Since the inner periphery of the filter medium 22 is in contact with the outer periphery of the inner cylinder 23, the filter medium 22 is not deformed even when oil flows in from the outer peripheral direction. The oil that has flowed into the upper inner peripheral space S2 flows into the lower inner peripheral space S3 from the intermediate plate inflow hole 24b, then flows into the hollow pipe 14 from the hollow pipe flow hole 14a, and the discharge hole 14c at the lower end. Is discharged to the outside of the oil filter 1.

Further, as described above, the outer cylinder 21 is made of resin or the like with an outer diameter slightly smaller than the inner diameter of the case body 11. For this reason, a force in a direction to spread the oil from the inside by the pressure of the oil flowing from the inflow hole 11a is applied to the outer cylinder 2.
1, the outer cylinder 21 bulges outward, but when the outer cylinder 21 abuts and contacts the inner peripheral surface of the case body 11, the pressure acting on the outer cylinder 21 is firmly formed by the metal material. The case body 11 can be received. Therefore, 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.
The weight of 0 itself can be reduced.

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 flow through the filter medium 22 smoothly. Therefore, a force equal to or greater than the urging force of the relief valve spring 16c 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 15 and the filter retainer 17. As a result, the oil flows into the upper space S2 from the relief hole 17a without passing through the filter medium 22 and is discharged to the outside of the oil filter 1 through the discharge hole 14c at the lower end as indicated by A '. It is supposed to prevent damage.

Oil filter 1 constructed as described above
The filter element 20 needs to be replaced every predetermined time because the filter material 22 is clogged due to long-term use, but removal of the filter element 20 is performed in the reverse order of the attachment. Filter element 20
When the case lid 13 is removed for replacement, the inside of the case portion 10 becomes atmospheric pressure, and the oil inside the case portion 10 drops to the level L1 of the oil inside the oil tank 50. At this time, since the oil in the case portion 10 (oil above the relief valve 15) flows into the filter element 20, unfiltered oil may be discharged from the oil filter 1 through the discharge hole 14c at the lower end portion. Absent.

After that, the operator grasps the handle 29 attached to the filter element 20 and lifts it, whereby the filter element 20 is pulled 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. Therefore, when the filter element 20 is pulled up, the cap 26 is removed from the intermediate plate 24 while being fitted in the hollow pipe 14.

When the filter element 20 is further pulled up, the cap 26 is inserted into the element portion discharge hole 25.
And the element discharge hole 25 is closed by the cap 26. Then, by further pulling up 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. In this way, the disposition position of the cap 26 in the filter element 20 once attached to the case portion 10 is
Even when the filter element 20 is not attached to the case portion 10, it is different from the disposing position of the cap 26 of the unused filter element 20. Therefore, by observing the bottom surface of the filter element 20, it is possible to easily determine whether or not the filter element has been used once.

When the oil level in the oil tank 50 is L1, the element portion discharge hole 2
When 5 goes up to the position of L0 (the position of the cap 26), it is closed by 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. Therefore, the filter element 20 to be removed can be lightened. At the same time, the residual oil does not leak from the element discharge hole 25. Further, the upper portion of the filter element 20 has a handle 2
Since it is covered with the lid portion 29a of No. 9, the residual oil in the replaced filter element 20 does not splash and impinge on the operator, and the surroundings are not polluted.

The initial oil level should be adjusted to the cap 2
Set it to be level L2 below the 6th position,
If the hollow pipe 14 is formed so that the cap 26 is located above the level L1, the residual oil in the filter element 20 at the time of replacement can be eliminated, and the replacement becomes easier. Further, since the filter element 20 is made of a flammable material, the replaced filter element 20 can be incinerated. Further, since the filter element 20 to be incinerated does not require a mechanism such as a spring or a sliding shaft for closing the element portion discharge hole 25 with the cap 26, the disposable filter element 20 can be manufactured at low cost. it can.

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 at least a part of the outer peripheral surface of the cap 26 can be fitted with a fitting protrusion (claw) on the lower surface of the intermediate plate 24. The cap 26 may be formed, and the cap 26 may be configured to be disposed in the filter element 20 by fitting and holding the cap 26. Therefore, in this case, the intermediate plate fitting portion 26e becomes unnecessary. Further, the intermediate plate fitting portion 26e may not be unnecessary, and the fitting protrusion may be fitted into and held by the intermediate plate fitting portion 26e.

As described above, when the cap 26 is arranged in the intermediate portion of the filter element 20, when the cap 26 is made of flammable rubber or the like which is easily affected by heat, Even when the lower end plate 28 is fixed to the lower end surface of the outer cylinder 21 by welding, the heat during welding does not act on the cap 26, so that the cap 26 is not adversely affected.

Next, as shown by the 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. In this case as well, the filter element 20 is inserted from the upper opening of the case body 11 as in the case described above to be mounted on the case portion 10. Therefore, when the filter element 20 is inserted, first, the cap 26 is fitted to the tip portion of the hollow pipe 14. When the filter element 20 is pushed downward in this state, the cap 26 and the element portion discharge hole 25 are disengaged from each other, and insertion is possible until the bottom surface of the filter element 20 abuts the bottom surface of the case body 11.

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, so that the upper surface of the lid portion 26a contacts the lower surface of the intermediate plate 24,
By adjusting the length of the hollow pipe 14 and the position of the intermediate plate 24, the cap 26 is inclined with respect to the tip portion of the hollow pipe 14 by the external force such as the flow of oil and the vibration of the oil tank 50, and It can be prevented from coming off.

In this embodiment, the upper surface of the lid portion 26a and the lower surface of the intermediate plate 24 are in contact with each other, but it is not always necessary to bring them into contact with each other, and the cap 26 is attached to the tip portion of the hollow pipe 14. It may be configured to have a slight gap as long as it does not incline with respect to the tip and does not come off from the tip. Further, as shown by the chain line, since only the cap 26 is not locked to the intermediate plate 24, it is not always necessary to form the upper protrusion 26f, and the length of the intermediate plate fitting portion 26e is set to the thickness of the intermediate plate 24. On the other hand, it does not need to be strictly adjusted. Further, 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 to have a diameter smaller than that of the lid portion 26a.

Further, the intermediate plate 24 does not necessarily need to be provided with the cap fitting hole 24a or the like engaging portion with the cap 26, 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 and the lid portion 26a Upper surface and intermediate plate 24
The cap 26 may have a slight gap so that it does not come into contact with the lower surface of the hollow pipe 14 or the cap 26 does not incline with respect to the distal end of the hollow pipe 14 or come off from the distal end.
In this case, the lid portion 26a of the cap 26 is
It is preferable that the shape of the upper surface of the is a gentle convex shape so that the oil flows smoothly.

Further, as long as the flow rate and vibration of the oil flowing through the filter element 20 is small and 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 or the intermediate plate is obtained. Fitting part 26e
Is not necessary.

According to the filter element 20 thus constructed, the upper element portion inflow hole 27a is closed by the handle 29, and the element portion discharge hole 25 is closed by the cap 26. In a state before being attached to the portion 10, dust and the like do not enter not only from above the filter element 20 but also from below.

Further, the cap fitting hole 24a formed in the central portion of the intermediate plate 24 is allowed to be slightly displaced, or the intermediate plate 24 and the cap 26 are not fitted to each other. Because it is possible,
(In particular, the formation position and length of the hollow pipe 14) can be easily manufactured, and the filter element 20 can be easily manufactured.
(In particular, the position of the intermediate plate 24, the position of the cap fitting hole 24a, and the inner diameter) can be easily manufactured. Therefore, the oil filter 1 can be manufactured more inexpensively, and the hollow pipe 14 and the cap 26 can be easily fitted to each other, so that the filter element 20 can be easily attached to the case portion 10. It can be carried out.

In the above embodiment, the oil filter 1 is connected to the end portion 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 filter element 20 is provided. The case where the discharge hole 14c at the lower end of the above is used as a return filter configured to be immersed in the oil in the oil tank 50 has been described, but the present invention is not limited to this. For example, the oil filter 4 shown in FIG.
As described above, the L-shaped discharge pipe 49 connected to the discharge hole 44c is provided at the lower end of the case main body 41, and the case main body 41 is provided with the mounting brackets 41a, 41a ... Not connected in the middle of the piping of the hydraulic circuit, and the mounting brackets 41a, 41a ...
It can be used also as an in-line filter for filtering the hydraulic oil flowing in the piping of the hydraulic circuit by fixing it to the wall surface or the like.

According to the oil filter 4 thus constructed, by removing the case lid 43, the oil in the filter element 20 flows out from the discharge pipe 49. Therefore, when the filter element 20 is removed, the oil inside the filter element 20 is removed. There is no oil left in.

Further, the case lid 43 may be provided with an air bleeding plug 43a. According to the oil filter 4 having such a construction, the air in the pipe can be appropriately evacuated. The oil filter 4 has the same structure as that of the oil filter 1 except for the parts described by adding numbers, and therefore the individual description thereof will be omitted. Further, in each of the above-mentioned 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, but it is possible to filter other fluids such as water and fuel. Of course, it can also be used as a filter.

[0057]

As described above, in the fluid filter according to the present invention, the end portion of the hollow pipe formed by extending upward from the case portion discharge hole of the case bottom portion through the filter element portion discharge hole is covered. The member is attached. And
When the filter element is removed, the bottom of the filter element is closed by being removed from the hollow pipe and mounted in the element portion 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 from the fluid filter, it is possible to adjust the amount of fluid such as oil remaining inside the filter element when the filter element is replaced. Therefore, the weight of the filter element at the time of replacement can be reduced. Furthermore, since the residual fluid does not leak out of the filter element, the surroundings are not contaminated during replacement. Further, 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, so that it can be formed of plastic or the like. The weight of the element itself can be reduced.

Here, when the filter element is in an unused state before being mounted in the case, the lid member arranged in the filter element is locked to the reinforcing plate joined to the inner peripheral surface of the filter element. In this case, even if the bottom portion of the filter element is heated during the assembly of the filter element, it is not affected by the heat. Further, when the filter element is in the unused state and the lid member provided inside the filter element is mounted so as to cover the element portion discharge hole, dust from below the filter element in the unused state Can be prevented from entering and the filter element can be easily attached to the case because the hollow pipe and the lid member can be easily fitted when the filter element is attached to the case. You can

Here, in the case where at least the fitting portion of the lid member with respect to the hollow pipe and the element portion discharge hole is formed of an elastic material so that the hollow pipe and the element portion discharge hole can be fitted with each other, When the filter element is pulled out upward to remove the filter element, the lid member is disengaged from the tip end of the hollow pipe and fitted into the element portion discharge hole, so that the filter element can be easily replaced. Further, since the replacement filter element does not need to be provided with a mechanism for closing the element portion discharge hole by the lid member,
The filter element can be manufactured inexpensively.

If the filter element is made of a combustible material, it can be incinerated, so that the filter element after use can be easily treated. Also, by providing a detachable handle for the filter element on the upper part of the filter element,
Since the filter element can be easily attached to and detached from the case, the filter element replacement work can be performed more easily. Furthermore, if this handle can also be used as a lid for covering the upper surface of the filter element, it is possible to prevent dust from entering the inside of the filter element in the unused state from above, and at the time of replacement, the inside of the filter element can be prevented. Since the residual fluid of 1 does not splash outside, it does not stain the surroundings of the fluid filter or the clothes of the worker.

[Brief description of 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 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 element 25 Element part discharge hole 26 Cap (lid member) 29 Handle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimio Okabe 2-1-22 Higashi-Arima, Miyamae-ku, Kawasaki-shi, Kanagawa WAKO SANGYO CO., LTD.

Claims (9)

[Claims] 1. A case formed in a bottomed cylindrical shape having a case portion discharge hole at a bottom portion, and a hollow pipe extending upward from the case portion discharge hole and having a side surface with a through hole. The bottom pipe is formed in a cylindrical shape with a bottom portion having an element portion discharge hole formed so that the hollow pipe can penetrate therethrough, and is inserted into the case from an upper opening of the case, and from the element portion discharge hole. A filter element mounted on the case by protruding the hollow pipe into an inner peripheral space, and disposed in the filter element, and detachably attached to an upper end portion of the hollow pipe and the element portion discharge hole. A lid member configured, and in a state in which the filter element is mounted in the case, the lid member is mounted on the upper end portion of the hollow pipe, The fluid introduced into the outer peripheral space formed on the outer peripheral side after filtered through a provided filter media within the filter element in the data element,
The fluid is discharged to the outside from the case portion discharge hole through the flow hole of the hollow pipe protruding into the inner peripheral space of the filter element, and in a state where the filter element is removed from the inside of the case, A fluid filter characterized in that a lid member is detached from the hollow pipe and attached to the element portion discharge hole to close the filter element bottom portion. 2. A reinforcing plate having a through hole vertically formed therein, a lid member engaging portion formed therein, and an outer periphery joined to an inner peripheral surface of the filter element in an inner peripheral space of the filter element. The lid member is detachably formed with respect to the lid member locking portion, and in the unused state before the filter element is mounted in the case, the lid member is fixed to the lid member locking portion. The fluid filter according to claim 1, wherein the lid member is locked so that the lid member is disposed in the filter element. 3. The lid member engaging portion is a lid member fitting hole formed by penetrating the reinforcing plate, and a reinforcing member which is fittable with the lid member fitting hole on an upper surface of the lid member. The fluid filter according to claim 2, wherein a plate fitting protrusion is formed. 4. In the unused state before the filter element is mounted in the case, the lid member is mounted so as to cover the element portion discharge hole and disposed in the filter element. The fluid filter according to claim 1, wherein the fluid filter is a filter. 5. A reinforcing plate having a vertical through hole formed in the inner space of the filter element and an outer periphery joined to the inner surface of the filter element is provided in the case. When the filter element is attached, the lid member is attached to the upper end of the hollow pipe, and the upper surface of the lid member is located near the lower surface of the reinforcing plate, so that the lid member falls off. The fluid filter according to any one of claims 1 to 4, wherein the fluid filter is prevented. 6. At least a fitting portion of the lid member with the upper end portion of the hollow pipe and a fitting portion with the element portion discharge hole are formed of an elastic material, and the filter element is removed when the filter element is removed. After the element portion discharge hole is moved upward along the outer circumference of the hollow pipe by pulling upward, and the lid member is fitted into the element portion discharge hole,
The fluid filter according to any one of claims 1 to 5, wherein the lid member is detached from a tip portion of the hollow pipe. 7. The fluid filter according to claim 1, wherein the filter element is made of a combustible material. 8. The fluid filter according to claim 1, wherein a handle for attaching and detaching the filter element is detachably arranged on an upper portion of the filter element. 9. The fluid filter according to claim 8, wherein the handle for attaching and detaching the filter element also serves as a lid for covering the upper surface of the filter element.