WO2019235530A1

WO2019235530A1 - Filter device

Info

Publication number: WO2019235530A1
Application number: PCT/JP2019/022353
Authority: WO
Inventors: 信行北島; 正法若林
Original assignee: ヤマシンフィルタ株式会社
Priority date: 2018-06-07
Filing date: 2019-06-05
Publication date: 2019-12-12
Also published as: JPWO2019235530A1; CN112118898A; CN112118898B; JP7394754B2

Abstract

Provided is a filter device that can be applied to a product being used by a user and that is easy to maintain. A lid provided to an upper side of a tank having an opening section on an upper surface thereof includes: a substantially cylindrical flange part detachably provided to the tank; and a cover assembly detachably provided to the flange part. The diameter of a hole in the flange part is larger than the diameter of a filter element, and a hole provided with a detection unit is formed on the outer peripheral surface of the flange part toward the radially inner side thereof. A substantially plate-shaped plate part provided to the upper side of the flange part so as to cover a hollow section of the flange part is provided with an insertion part to be inserted into the hollow section of the flange part and a case. At an end of the insertion part opposite the plate part, there is provided a pressing member having a substantially annular flat surface portion that abuts on a substantially annular seal member provided to the upper surface of the upper plate of the filter element.

Description

Filter device

The present invention relates to a filter device.

Patent Document 1 discloses a filter device in which a differential pressure measuring device is provided in a filter housing.

Special table 2018-511465 gazette

However, the invention described in Patent Document 1 has a problem that the shape of the filter housing is complicated, and maintenance such as replacement of the filter element is not easy. Moreover, in the invention described in Patent Document 1, a dedicated filter housing and filter element are required to provide the differential pressure measuring device in the filter housing, and there is a problem that it cannot be applied to a product being used by a user.

The present invention has been made in view of such circumstances, and an object thereof is to provide a filter device that can be applied to a product being used by a user and that can be easily maintained.

In order to solve the above-described problem, a filter device according to the present invention is, for example, a filter device provided in a tank having an opening on an upper surface thereof, and a substantially bottomed cylindrical case provided in the tank. A filter element provided in the case, the filter element having a substantially cylindrical filter medium, and an upper plate provided at an upper end of the filter medium, and the tank so as to cover the opening A lid having a substantially cylindrical flange portion detachably provided on the tank, and a cover assembly detachably provided on the flange portion; A detection portion provided in the flange portion, wherein a diameter of the hole of the flange portion is larger than a diameter of the filter element, and the outer peripheral surface of the flange portion is directed radially inward. And the cover assembly is provided with a substantially plate-like plate-like portion provided on the flange portion so as to cover the hollow portion of the flange portion, and the plate-like portion. And an insertion portion that is inserted into the inside of the case, and a pressing portion having a substantially annular flat surface portion that abuts against the seal member at an end opposite to the plate-like portion of the insertion portion. A member is provided, and a substantially annular seal member is provided between the upper plate and the pressing member.

According to the filter device of the present invention, the lid provided on the upper side of the tank having the opening on the upper surface is provided with the substantially cylindrical flange portion detachably provided on the tank, and detachably provided on the flange portion. A cover assembly having a diameter of a hole in the flange portion larger than a diameter of the filter element, and an outer peripheral surface of the flange portion is formed with a hole provided with a detection portion toward a radially inner side. Yes. As a result, the filter element can be replaced simply by removing the cover assembly, and additional work such as removing the wiring provided in the detection unit when the filter element is replaced is unnecessary. Easy.

Further, according to the filter device of the present invention, the substantially flat plate-like portion provided above the flange portion so as to cover the hollow portion of the flange portion is inserted into the hollow portion of the flange portion and the inside of the case. And a pressing member having a substantially annular plane portion is provided at the end opposite to the plate-like portion of the insertion portion, and between the upper plate of the filter element and the pressing member. A substantially annular seal member is provided. Thus, since the pressing member is configured to press against the filter element, the lid of the present invention can be applied to a product being used by the user. Therefore, the conventional filter device can be used as the filter device of the present invention only by replacing the lid without replacing the dedicated parts.

Here, the cover assembly includes an elastic member having both ends provided on the plate-like portion and the pressing member, and a valve provided on the plate-like portion, and the valve has the plate-like shape. A substantially cylindrical valve body provided in the portion, the pressing member is provided movably with respect to the valve body, and in the state where the cover assembly is attached to the flange portion, When the elastic member is deformed, the flat portion presses the filter element, and when the elastic member is not deformed, the valve body does not protrude from the flat portion, and the elastic member When it is deformed, the tip of the bulb may be formed at a height protruding from the flat portion. Thus, in a state where the cover assembly is removed, the elastic member that applies a biasing force to the filter element is not deformed, and the valve does not protrude from the flat portion, so that the removed cover assembly can be placed on the upper surface of the tank. And maintainability is further improved.

Here, a first seal member is provided between the cover assembly and the flange portion, and a second seal member is provided between the valve body and the pressing member. The deformation amount of the second seal member may be smaller than the deformation amount of the first seal member, or the hardness of the second seal member may be softer than the hardness of the first seal member. Accordingly, the pressing member can be provided so as to be movable in the vertical direction along the outer peripheral surface of the valve body and so as to be inclined with respect to the valve body.

Here, the pressing member is movable in the vertical direction along the outer peripheral surface of the valve body and is movable so as to be inclined with respect to the valve body. The outer peripheral surface of the pressing member has a substantially cylindrical shape. The positioning portion is provided so as to protrude downward, the outer peripheral surface of the upper plate is provided along the inner peripheral surface of the positioning portion, and the tip of the positioning portion has a low height on the inner peripheral surface side. The outer peripheral surface side may be cut out so as to have a high height. The pressing member is movable in the vertical direction along the outer peripheral surface of the valve body, and is movable so as to be inclined with respect to the valve body. The pressing member is substantially protruded downward. A cylindrical positioning portion is provided, and the inner peripheral surface of the upper plate is provided along the outer peripheral surface of the positioning portion. The tip of the positioning portion has a lower height on the outer peripheral surface side, and the inner peripheral surface side. It may be cut out so as to increase the height. Thereby, the pressing member moves and the upper plate and the pressing member are automatically positioned. Therefore, it is easy to attach the cover assembly even when the operator performs rough work such as exchanging many filter elements at once.

Here, the pressing member includes a pressing portion main body having a substantially cylindrical tubular portion and a substantially annular ring plate portion provided outside the cylindrical portion, and a lower portion of the pressing portion main body. A tubular body provided on a side of the valve body, wherein the tubular portion is provided along an outer peripheral surface of the valve body, and the annular plate portion may include the flat surface portion. . Thereby, a press member can be made into a simple structure.

According to the present invention, it is possible to provide a filter device that can be applied to a product being used by a user and can be easily maintained.

It is a section perspective view showing the outline of tank 100 provided with return filter 1 which is one embodiment of the present invention. 2 is a cross-sectional view showing an outline of a return filter 1. FIG. FIG. 3 is a cross-sectional view showing an outline of the return filter 1 in a state where a cover assembly 32 is removed from a flange portion 31. It is a figure which shows a mode that the cover assembly 32 is removed from the flange part 31, and the filter element 20 is replaced | exchanged. FIG. 3 is a cross-sectional view showing an outline of the return filter 1 and is an enlarged view of the vicinity of a lid body 30. FIG. 3 is a cross-sectional view showing an outline of the return filter 1 and is an enlarged view of the vicinity of a lid body 30. 3 is an exploded perspective view of a lid body 30. FIG. 3 is an exploded perspective view of a lid body 30. FIG. It is a perspective view which shows the outline of the return filter 2 which is one Embodiment of this invention. 3 is a perspective sectional view showing an outline of a return filter 2. FIG. It is a perspective view which shows the outline of the return filter 2 when the cover assembly 32A is removed from the flange part 31A. It is sectional drawing which shows the outline of 32 A of cover assemblies when the cover assembly 32A is removed from the flange part 31A.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, a hydraulic oil is described as an example of the liquid to be filtered, but the liquid to be filtered is not limited to the hydraulic oil. In this embodiment, a return filter is described as an example, but the filter device of the present invention is not limited to a return filter.

<First Embodiment>
FIG. 1 is a cross-sectional perspective view showing an outline of a tank 100 provided with a return filter 1 according to an embodiment of the present invention. In FIG. 1, hatching indicating a cross section is omitted.

The tank 100 is a tank for storing hydraulic oil. The tank 100 is installed in a working machine (not shown) (for example, a hydraulic device), and is provided in a hydraulic circuit for hydraulic oil supplied to the hydraulic device. However, the tank 100 is not limited to the one provided in the hydraulic circuit.

The tank 100 has a box shape, for example, and is hollow inside. The tank 100 mainly includes a bottom surface 101, a top surface 102 that faces the bottom surface 101, and a side surface 103 that is substantially orthogonal to the bottom surface 101 and the top surface 102.

An opening 102 a is formed on the upper surface 102. On the upper surface 102, a thick portion 102b for attaching the return filter 1 is formed around the opening portion 102a. However, the thick portion 102b is not essential. The return filter 1 is provided inside the tank 100 (here, below the thick portion 102b). The opening 102a is covered with a lid 30 (detailed later) of the return filter 1.

The side surface 103 is provided with an inflow portion 104 through which hydraulic oil flows into the return filter 1. The inflow portion 104 guides hydraulic oil from the outside of the tank 100 to the inside of the return filter 1 (space S1). The hydraulic fluid guided to the return filter 1 is filtered by the return filter 1 and flows out into the space S2, and then stored in the tank 100 (space S3).

In the vicinity of the bottom surface 101, an outflow portion 101a is formed for allowing hydraulic oil in the tank 100 to flow out to a hydraulic pump (not shown) or the like. A suction strainer (not shown) is provided inside the tank 100, and the hydraulic oil that has passed through the suction strainer flows out of the tank 100 from the outflow portion 101a.

A partition plate 105 is provided inside the tank 100 so that the hydraulic oil flowing out from the return filter 1 does not directly hit the suction strainer. The partition plate 105 is not essential.

Hereinafter, the return filter 1 will be described. FIG. 2 is a cross-sectional view schematically showing the return filter 1. In FIG. 2, hatching indicating a cross section is omitted.

The return filter 1 mainly includes a case 10, a filter element 20, and a lid 30.

The case 10 is formed of a material having high corrosion resistance (for example, a metal such as stainless steel). The case 10 is provided inside the tank 100 so as to protrude downward (−z side) from the upper surface 102 of the tank 100. The case 10 and the tank 100 may be an integral part or may not be an integral part.

The case 10 has a substantially cylindrical shape with a bottom, and an upper end surface is open. The case 10 has a hollow inside, and is provided with a filter element 20 and the like.

The case 10 has a substantially cylindrical side surface 11. In the side surface 11, an inflow port 12 that is a hole through which hydraulic oil flows into the return filter 1 from the inflow portion 104 (see FIG. 1) is formed. When hydraulic oil flows in from the inflow port 12, the hydraulic oil is stored in a space (space S 1) inside the case 10 and outside the filter element 20.

The case 10 also has a bottom surface 13. A substantially cylindrical outflow portion 15 is provided so as to penetrate the bottom surface 13. The outflow portion 15 communicates the space inside the filter element 20 (space S2) and the space outside the case 10 (space S3, see FIG. 1).

The filter element 20 is a bottomed substantially cylindrical member and is provided inside the case 10. The filter element 20 mainly includes a filter medium 21, an outer cylinder 22, an inner cylinder 23, a plate 24, a plate 25, and a seal member 26. In FIG. 2, a part of the filter element 20 is shown in cross section.

The filter medium 21 is a substantially cylindrical member having openings at both ends. The filter medium 21 is formed by folding a filter paper made of synthetic resin, paper, or the like, and connecting both ends of the folded filter paper into a cylindrical shape. On the outside of the filter medium 21, an outer cylinder 22 having a hole through which hydraulic oil passes is provided in substantially the entire area. Further, an inner cylinder 23 in which a hole through which hydraulic oil passes is formed in substantially the entire area is provided inside the filter medium 21. However, the outer cylinder 22 is not essential.

A plate 24 is provided at the upper end of the filter medium 21. The plate 24 is a member provided along the upper end surface of the filter medium 21, and covers the upper end surfaces of the filter medium 21, the outer cylinder 22, and the inner cylinder 23. The plate 24 has a substantially annular plane portion, and a substantially annular seal member 26 is provided on the upper surface (the upper (+ z side) surface) thereof.

In the present embodiment, the seal member 26 is bonded to the plate 24, but the form in which the seal member 26 is provided on the plate 24 is not limited thereto. For example, the sealing member 26 may be provided on the plate 24 by forming a recess in the plate 24 and press-fitting the sealing member 26 into the recess. Moreover, although the cross-sectional shape of the sealing member 26 is a substantially plate shape, the form of the sealing member 26 is not restricted to this. For example, an O-ring may be provided on the plate 24 to serve as a seal member.

A plate 25 is provided at the lower end of the filter medium 21. The plate 25 is a substantially disk-shaped member provided along the lower end surface of the filter medium 21, and covers the lower end surfaces of the filter medium 21, the outer cylinder 22, and the inner cylinder 23. In a state where the filter element 20 is provided inside the case 10, the plate 25 contacts the bottom surface 13 and the outflow portion 15 via a seal member (not shown). Thereby, the hydraulic oil filtered by the filter element 20 does not flow out into the space S1.

The lid 30 is provided on the upper side of the tank 100 so as to cover the opening 102a. When the case 10 penetrates the upper surface 102 of the tank 100, the lid 30 is provided on the case 10.

The lid 30 mainly has a flange portion 31 and a cover assembly 32. The flange portion 31 has a substantially cylindrical shape and is detachably provided on the tank 100. A substantially cylindrical hole 31 b is formed in the approximate center of the flange portion 31. The diameter d1 of the hole 31b is larger than the diameter d2 of the filter element 20.

The hole 31a is formed in the outer peripheral surface 31e of the flange part 31 toward radial inner side, and the detection part 63 is provided in the hole 31a. By providing the detection unit 63 in the hole 31 a, the opening of the hole 31 a is covered by the detection unit 63. The detection unit 63 is a differential pressure detection device that detects a differential pressure between the space S1 and the space S2. However, the detection unit provided in the hole 31a is not limited to the differential pressure detection device. For example, the temperature in the space S 2 can be measured by providing a temperature sensor in the flange portion 31.

The cover assembly 32 is provided on the upper side (+ z side) of the flange portion 31 so as to cover the hollow portion of the flange portion 31. The cover assembly 32 is detachably attached to the flange portion 31.

FIG. 3 is a cross-sectional view showing an outline of the return filter 1 in a state where the cover assembly 32 is removed from the flange portion 31. The filter element 20 can be replaced by removing the cover assembly 32 from the flange portion 31.

FIG. 4 is a view showing a state in which the cover assembly 32 is removed from the flange portion 31 and the filter element 20 is replaced. The removed cover assembly 32 can be placed on the upper surface 102 of the tank 100. Further, since the diameter d1 of the hole 31b is larger than the diameter d2 of the filter element 20 (see FIGS. 2 and 3), the filter element 20 can be easily taken out. Therefore, maintenance is easy.

Next, the cover assembly 32 will be described in detail. 5 and 6 are cross-sectional views schematically showing the return filter 1, and are enlarged views of the vicinity of the lid 30. FIG. FIG. 5 shows a state in which the valve 36 (detailed later) is closed, and FIG. 6 shows a state in which the valve 36 is opened. 5 and 6, the hatching showing the cross section is omitted.

The cover assembly 32 mainly has a plate-like portion 33 and an insertion portion 34. The insertion portion 34 mainly includes a pressing member 35, a valve 36, and an elastic member 37. The plate-like portion 33 is a substantially plate-like member, and is provided on the upper side of the flange portion 31 so as to cover the hollow portion of the flange portion 31. The insertion portion 34 is provided on the lower side (−z side) of the plate-like portion 33, and is inserted into the hole 31 b of the flange portion 31, the opening 102 a and the inside of the case 10.

7 and 8 are exploded perspective views of the lid 30. FIG. FIG. 7 shows a state seen from diagonally upward, and FIG. 8 shows a state seen from diagonally downward.

The pressing member 35 is a member provided on the opposite end of the insertion portion 34 from the plate-like portion 33, and an elastic member 37 is provided between the plate-like portion 33 and the pressing member 35. In other words, both ends of the elastic member 37 are provided on the plate-like portion 33 and the pressing member 35. The valve 36 is provided on the lower side (−z side) of the plate-like portion 33 and is inserted inside the elastic member 37.

The pressing member 35 includes a substantially cylindrical tubular portion 35a, a flat portion 35b provided below the tubular portion 35a, and a positioning portion 35c provided on the outer peripheral surface of the flat portion 35b.

Returning to the description of FIGS. A valve body 36c (detailed later) of the valve 36 is provided on the inner peripheral surface of the cylindrical portion 35a. A seal member 38 (described in detail later) is provided between the cylindrical portion 35a and the valve body 36c, and thereby the cylindrical portion 35a is provided so as to be movable with respect to the valve body 36c. An elastic member 37 is provided on the outer peripheral surface of the cylindrical portion 35a. The elastic member 37 is in contact with the outer peripheral surface of the cylindrical portion 35a and is movable along the outer peripheral surface of the cylindrical portion 35a.

The flat portion 35 b has a substantially annular shape, and abuts against the seal member 26 in a state where the cover assembly 32 is attached to the flange portion 31.

The positioning portion 35c is a substantially cylindrical member provided along the outer peripheral surface of the flat portion 35b, and protrudes toward the lower side (−z side). The diameter of the inner peripheral surface of the positioning portion 35 c is larger than the diameter of the outer peripheral surface of the plate 24, and the outer peripheral surface of the plate 24 along the inner peripheral surface of the positioning portion 35 c in a state where the cover assembly 32 is attached to the flange portion 31. Is provided. In the present embodiment, the outer peripheral surface of the plate 24 is a cylindrical portion provided outside the substantially annular planar portion, but when the cylindrical portion is not provided outside the planar portion. The outer peripheral surface of the flat portion is the outer peripheral surface of the plate 24.

The tip of the positioning portion 35c (the end on the -z side) has a cutout portion 35d cut obliquely. The cutout portion 35d has a taper such that the height on the inner peripheral surface side of the positioning portion 35c is low and the height on the outer peripheral surface side is high. Thereby, when attaching the cover assembly 32 to the flange part 31, positioning with the press member 35 and the filter element 20 becomes easy. The positioning part 35c is not essential.

The valve 36 is provided in the cover assembly 32 and protrudes to the lower side (−z side) of the cover assembly 32. The valve 36 mainly includes a valve stem 36a, a valve body 36b movable with the valve stem 36a, a substantially cylindrical valve body 36c, an elastic member 36d, and a fixed portion 36e. One end of the elastic member 36d is provided on the fixed portion 36e, and the other end is provided on the valve body 36c.

The valve body 36c has a substantially cylindrical shape (see FIGS. 7 and 8) and is provided in the plate-like portion 33. When the valve 36 is closed (see FIG. 5), the valve body 36b is in contact with the lower end surface of the valve body 36c. A plurality of holes 36g penetrating the valve body 36c in the radial direction are formed on the side surface of the valve body 36c. When the filter medium 21 is clogged and the pressure in the space S1 is increased, the valve body 36b is pushed down against the urging force of the elastic member 36d and separated from the valve body 36c, thereby opening the valve 36 (see FIG. 6). Thus, the return filter 1 is prevented from being damaged by flowing the hydraulic oil from the space S1 to the space S2.

The valve body 36c is formed with a hole 36f penetrating the valve body 36c in the axial direction. The hole 36 f, the hole 33 a formed in the plate-like portion 33, and the hole 31 c formed in the flange portion 31 constitute a flow path 61, and the flow path 61 includes the space inside the hole 31 a and the filter element 20. It communicates with the internal space (space S2). The flow path 61 has a substantially U-shape or a substantially U-shape when cut along a plane passing through the central axis of the cover assembly 32.

The detection unit 63 can detect the pressure in the space S2 by the flow path 61. In addition, a hole 31d that connects the hole 31a and the space S1 is formed in the flange portion 31, and the detection unit 63 can detect the pressure in the space S1 through the hole 31d. As a result, the detection unit 63 can detect the differential pressure between the space S1 and the space S2.

The valve body 36c and the pressing member 35 are sealed by a sealing member 38. Further, the flange portion 31 and the plate-like portion 33 and the flange portion 31 and the upper surface 102 are sealed by a seal member 39. The

seal members

38 and 39 are, for example, O-rings and are formed of deformable rubber or the like. The deformation amount of the seal member 38 is smaller than the deformation amount of a general seal member (for example, the seal member 39). For example, the deformation amount of a general seal member is approximately 8% to approximately 30%, while the deformation amount of the seal member 38 is approximately 8% or less. For this reason, the pressing member 35 is movable in the vertical direction along the outer peripheral surface of the valve body 36c, and is movable so as to be inclined with respect to the valve body 36c.

In addition, the form which provides the pressing member 35 so that it can move to the up-down direction along the outer peripheral surface of the valve body 36c, and to be able to move with respect to the valve body 36c is not restricted to this. For example, the deformation amounts of the

seal members

38 and 39 are substantially the same (approximately 8% to approximately 30%), and the hardness of the seal member 38 may be softer than the hardness of the seal member 39. By softening the seal member 38, the pressing member 35 can easily move in the vertical direction along the outer peripheral surface of the valve body 36c, and can easily move so as to be inclined with respect to the valve body 36c.

As shown in FIGS. 2, 5, and 6, in the state where the cover assembly 32 is attached to the flange portion 31, the elastic member 37 is deformed (compressed) so that the plane portion 35 b moves the filter element 20 downward (−z Direction). Thereby, the filter element 20 is provided inside the case 10. Further, since the flat portion 35 b contacts the seal member 26, the hydraulic oil does not leak from between the pressing member 35 and the filter element 20.

When the cover assembly 32 is attached to the flange portion 31, the elastic member 37 is deformed, so that the tip (lower end) 36 h of the valve 36 protrudes below the flat portion 35 b and is inserted into the filter element 20. The

On the other hand, as shown in FIG. 3, when the cover assembly 32 is not attached to the flange portion 31, the elastic member 37 is not deformed, so that the tip 36h of the valve 36 does not protrude from the flat portion 35b. Is accommodated inside the pressing member 35. In other words, the valve body 36c has such a height that the valve 36 protrudes from the flat portion 35b when the elastic member 37 is deformed, and the valve 36 does not protrude from the flat portion 35b when the elastic member 37 is not deformed. Formed with. As a result, the removed cover assembly 32 can be placed on the upper surface 102 of the tank 100 (see FIG. 4), and the maintainability is improved.

Next, the function of the return filter 1 configured as described above will be described. The two-dot chain line arrow in FIG. 2 indicates the flow of hydraulic oil.

For example, when the driving of the work machine is started, the hydraulic oil starts to flow in the hydraulic circuit, and accordingly, the hydraulic oil flows into the space S1 and the inside of the case 10 is filled with the hydraulic oil. The hydraulic oil that has flowed into the space S1 flows from the outside to the inside of the filter medium 21, and dust or the like in the hydraulic oil is removed by the filter medium 21. The filtered hydraulic oil flows out into the space S2. Thereafter, the filtered hydraulic oil flows out from the outflow portion 15 into the space S3.

When filtration is repeated, the filter medium 21 is clogged and the pressure in the space S1 rises, so the filter element 20 is replaced. When replacing the filter element 20, the work machine is first stopped.

3 and 4, when the cover assembly 32 of the lid 30 is removed from the flange portion 31, the filter element 20 can be extracted through the opening 102a and the hole 31d. Since the diameter of the opening 102a and the diameter d1 of the hole 31d are larger than the diameter d2 of the filter element 20, the filter element 20 can be replaced simply by removing the cover assembly 32, and maintenance is easy.

Further, since the detection unit 63 is provided on the flange portion 31, the detection unit 63 remains attached to the tank 100 side when the filter element 20 is replaced, and the detection unit 63 is attached together with the cover assembly 32 from the tank 100. Not removed. Therefore, additional work such as removal of wiring provided in the detection unit 63 is not required, and maintenance is easy.

When the used filter element 20 is taken out, the unused filter element 20 is inserted into the case 10. Since the diameter of the opening 102a and the diameter d1 of the hole 31d are larger than the diameter d2 of the filter element 20, the filter element 20 can be easily inserted.

Thereafter, the cover assembly 32 is attached to the flange portion 31. At this time, the positioning portion 35c covers the plate 24 as shown in FIG. 5, but the plate 24 and the pressing member 35 are automatically positioned because the notch portion 35d is formed at the tip of the positioning portion 35c. . Accordingly, the cover assembly 32 can be easily attached even when the operator performs a rough operation such as replacing a large number of filter elements 20 at a time.

It should be noted that maintenance work other than the replacement of the filter element 20 (for example, repair work) may occur. In this case, the flange portion 31 and the cover assembly 32 may be removed from the tank 100. This facilitates repair work.

According to the present embodiment, since the diameter d1 of the hole 31b of the flange portion 31 is larger than the diameter d2 of the filter element 20, the filter element 20 can be replaced simply by removing the cover assembly 32, and maintenance is easy. is there. Moreover, since the detection part 63 is provided in the flange part 31, additional work, such as removing the wiring etc. which were provided in the detection part 63, becomes unnecessary, and a maintenance is easy. Furthermore, since the removed cover assembly 32 can be placed on the upper surface 102 of the tank 100, the maintainability is further improved.

Further, according to the present embodiment, since the flange portion 31 is provided in the tank 100 and the pressing member 35 presses the filter element 20, the lid of the present invention is applied to the product being used by the user. 30 can be applied. Therefore, a conventional filter device can be used as the return filter 1 of the present invention by simply replacing the lid 30 without using a dedicated filter element.

<Second Embodiment>
Hereinafter, the return filter 2 according to the second embodiment will be described. In addition, about the part same as the return filter 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 9 is a perspective view showing an outline of the return filter 2 according to an embodiment of the present invention. FIG. 10 is a perspective cross-sectional view showing an outline of the return filter 2. In FIG. 10, the hatching indicating the cross section is omitted. In FIG. 10, a part of the return filter 2 is enlarged and displayed.

The return filter 2 is provided on the upper surface 102A of the tank 100A for storing hydraulic oil. The difference between the tank 100A and the tank 100 is that an attachment member 102c is provided on the upper surface 102 of the tank 100A, whereas the upper surface 102 of the tank 100 has a thick portion 102b. The inner peripheral surface of the attachment member 102c is the opening 102a.

The return filter 2 mainly includes a case 10, a filter element 20A, and a lid 30A.

The filter element 20 A is a bottomed substantially cylindrical member and is provided inside the case 10. The filter element 20A mainly includes a filter medium 21, an outer cylinder 22, an inner cylinder 23, a plate 24A, and a plate 25 (not shown).

A plate 24 A is provided at the upper end of the filter medium 21. The plate 24 A has two cylindrical portions provided on both sides of a substantially annular flat portion covering the upper ends of the filter medium 21, the outer cylinder 22, and the inner cylinder 23, and the outer cylindrical portion is the outer periphery of the outer cylinder 22. The inner cylindrical portion covers the inner peripheral surface of the inner cylinder 23.

The lid 30A is provided on the upper side of the tank 100A so as to cover the opening 102a. When case 10 passes through upper surface 102 A of tank 100, lid body 30 A is provided in case 10.

The lid 30A mainly has a flange portion 31A and a cover assembly 32A. The flange portion 31A is provided on the upper side of the upper surface 102A (here, the attachment member 102c). The flange portion 31A and the attachment member 102c are sealed by the seal member 39.

The flange portion 31A has a substantially cylindrical shape and is detachably attached to the tank 100A. A substantially cylindrical hole 31 b is formed in the approximate center of the flange portion 31. The diameter of the hole 31b is larger than the diameter of the filter element 20A.

The flange portion 31A has a convex portion 31g. Of the outer peripheral surface 31e of the flange portion 31A, a hole 31a is formed radially inward in a portion where the convex portion 31g is provided, and a detection portion 63 is provided in the hole 31a. Thereby, the arrangement | positioning position of the detection part 63 is made radial inside, and the diameter of 31 A of flange parts is made small.

The cover assembly 32A is provided on the upper side (+ z side) of the flange portion 31A so as to cover the hollow portion of the flange portion 31A. The cover assembly 32A is detachable from the flange portion 31A.

The cover assembly 32A mainly has a plate-like portion 33A and an insertion portion 34A.

The plate-like portion 33A is a substantially plate-like member, and is provided on the upper side of the flange portion 31A so as to cover the hollow portion of the flange portion 31A. Further, the plate-like portion 33A has a cylindrical portion 33c that is inserted into the hollow portion of the flange portion 31A. The flange portion 31A and the plate-like portion 33A are sealed by a seal member 39. Further, the plate-like portion 33A is provided with a concave portion 33b into which the convex portion 31g is inserted.

The insertion portion 34A is provided on the lower side (−z side) of the plate-like portion 33A, and is inserted into the opening 102a and the inside of the case 10. The insertion portion 34A mainly includes a pressing member 35A, a valve 36A, and an elastic member 37.

The pressing member 35A includes a pressing portion main body 35m and a cylindrical body 35n provided on the lower side (−z side) of the pressing portion main body 35m. An elastic member 37 is provided between the plate-like portion 33A and the pressing member 35A (here, the pressing portion main body 35m). The elastic member 37 biases a downward force (−z direction) to the pressing member 35A.

The pressing portion main body 35m includes a substantially cylindrical tubular portion 35h and a substantially annular annular plate portion 35i provided outside the tubular portion 35h. A valve body 36p (detailed later) of the valve 36 is provided on the inner peripheral surface of the cylindrical portion 35h, and the cylindrical portion 35h is provided along the outer peripheral surface of the valve body 36p. A seal member 38 is provided between the cylindrical portion 35h and the valve body 36p, whereby the cylindrical portion 35h can be moved in the vertical direction along the outer peripheral surface of the valve body 36p. The portion 35h is movable so as to be inclined with respect to the valve body 36p.

The annular plate part 35i has a substantially annular planar part 35g, and the planar part 35g is located on the outermost side of the annular plate part 35i. A substantially annular seal member 35j is provided on the lower side (−z side) of the flat portion 35g, that is, the surface on the plate 24A side. Therefore, when the cover assembly 32 is attached to the flange portion 31, the seal member 35j is provided between the plate 24A and the pressing member 35A.

The seal member 35j is a substantially ring-shaped member. As shown in FIG. 12, the cross-sectional shape of the sealing member 35j is a substantially plate shape. Two substantially annular projections are formed below the seal member 35j. However, the form of the seal member 35j is not limited to this. For example, an O-ring may be provided between the plate 24A and the pressing member 35A to serve as a seal member. Moreover, although the sealing member 35j is stuck or bonded to the flat portion 35g, the method of providing the sealing member 35j on the flat portion 35g is not limited thereto.

Returning to the explanation of FIG. A substantially cylindrical positioning part 35e is provided adjacent to the flat part 35g. The positioning portion 35e protrudes downward (−z side). The diameter of the outer peripheral surface of the positioning portion 35e is smaller than the diameter of the inner peripheral surface of the plate 24A, and the inner peripheral surface of the plate 24A extends along the outer peripheral surface of the positioning portion 35e when the cover assembly 32A is attached to the flange portion 31A. Provided. A cylindrical body 35n is provided along the inner peripheral surface of the positioning portion 35e. A plurality of holes are formed in the cylindrical body 35n, but the holes are not essential.

In the present embodiment, the inner peripheral surface of the plate 24A is a cylindrical portion provided inside the substantially annular flat portion, but when the cylindrical portion is not provided inside the flat portion. The inner peripheral surface of the flat portion is the inner peripheral surface of the plate 24A.

The tip of the positioning portion 35e (the end on the −z side) has a cutout portion 35f that is cut obliquely. The cutout portion 35f has a taper such that the height on the outer peripheral surface side of the positioning portion 35e is low and the height on the inner peripheral surface side is high. Accordingly, when the cover assembly 32A is attached to the flange portion 31A, the pressing member 35A and the filter element 20A can be easily positioned.

The valve 36A is provided on the lower side (−z side) of the plate-like portion 33A and is inserted inside the elastic member 37 and the pressing member 35A. The valve 36A mainly includes a valve stem 36a, an elastic member 36d, a valve body 36o movable together with the valve stem 36a, a substantially cylindrical valve body 36p, and a fixed portion 36q. One end of the elastic member 36d is provided on the fixed portion 36q, and the other end is provided on the valve body 36p.

The valve body 36p has a substantially cylindrical shape and is provided on the plate-like portion 33A. When the valve 36A is closed (see FIG. 10), the valve body 36o is in contact with the lower end surface of the valve body 36p. A plurality of holes 36k (see FIG. 12) penetrating the valve body 36p in the radial direction are formed on the side surface of the valve body 36p. When the filter medium 21 is clogged and the pressure in the space S1 increases, the valve body 36o is pushed down against the urging force of the elastic member 36d and separated from the valve body 36p, thereby opening the valve 36A. Thus, the return filter 2 is prevented from being damaged by flowing the hydraulic oil from the space S1 to the space S2.

The valve body 36p is formed with a hole 36f that penetrates the valve body 36c in the axial direction. The hole 36f, the hole 33a formed in the plate-like portion 33, and the hole 31f formed in the flange portion 31 constitute a flow path 61A, and the flow path 61A includes the space inside the hole 31a and the filter element 20A. It communicates with the internal space (space S2). The shape of the channel 61A when cut along a plane passing through the central axis of the cover assembly 32A is substantially L-shaped.

The detection unit 63 can detect the pressure in the space S2 by the flow path 61A. In addition, a hole 31d that connects the hole 31a and the space S1 is formed in the flange portion 31, and the detection unit 63 can detect the pressure in the space S1 through the hole 31d. As a result, the detection unit 63 can detect the differential pressure between the space S1 and the space S2.

In a state where the cover assembly 32A is attached to the flange portion 31A, the elastic member 37 is deformed (compressed) so that the flat surface portion 35g presses the filter element 20A downward (−z direction). Thereby, the filter element 20 is provided inside the case 10. Further, since the sealing member 35j is provided between the flat portion 35g and the plate 24A, the hydraulic oil does not leak from between the pressing member 35A and the filter element 20A.

When the cover assembly 32A is attached to the flange portion 31A, the elastic member 37 is deformed, so that the tip (lower end) 36h of the valve 36A projects below the lower end of the cylindrical body 35n, and the tip 36h is the filter element. It is inserted inside 20A.

FIG. 11 is a perspective view schematically showing the return filter 2 when the cover assembly 32A is removed from the flange portion 31A. In FIG. 11, a part of the return filter 2 is enlarged and displayed. FIG. 12 is a cross-sectional view schematically showing the cover assembly 32A when the cover assembly 32A is removed from the flange portion 31A. In FIG. 12, hatching indicating a cross section is omitted.

When the cover assembly 32A is not attached to the flange portion 31A, the elastic member 37 returns to the undeformed state (original shape), and the pressing member 35A moves downward (−z direction). As a result, the tip 36h of the valve 36A does not protrude from the lower end of the cylindrical body 35n and is accommodated in the pressing member 35A. In other words, in the valve body 36p, the tip 36h of the valve 36A protrudes from the lower end of the cylindrical body 35n when the elastic member 37 is deformed, and the tip 36h of the valve 36A is cylindrical when the elastic member 37 is not deformed. It is formed with a height that does not protrude from the lower end of the body 35n.

Next, replacement of the filter element 20A in the return filter 2 will be described. When the filtration is repeated, the filter medium 21 is clogged and the pressure in the space S1 rises, so the filter element 20A is replaced. When replacing the filter element 20A, the work machine is stopped and the cover assembly 32A is removed from the flange portion 31A. Since the diameter of the opening 102a and the diameter of the hole 31b are larger than the diameter of the filter element 20, the filter element 20A can be replaced simply by removing the cover assembly 32A, and maintenance is easy.

Further, since the detection unit 63 is provided in the flange portion 31A, the detection unit 63 remains attached to the tank 100A side when the filter element 20 is replaced. Therefore, additional work such as removal of wiring provided in the detection unit 63 is not required, and maintenance is easy.

When the used filter element 20A is taken out, the unused filter element 20A is inserted into the case 10. Thereafter, the cover assembly 32A is attached to the flange portion 31A. As shown in FIGS. 10 and 12, since the notch 35f is formed at the tip of the positioning portion 35e, the plate 24A is guided to the outside of the positioning portion 35e, and the plate 24A and the pressing member 35A are automatically positioned. Is done. Accordingly, the cover assembly 32A can be easily attached even when the operator performs a rough operation such as replacing a large number of filter elements 20A at a time.

As shown in FIGS. 11 and 12, when the cover assembly 32A is removed from the flange portion 31A, the elastic member 37 returns to its original position, so that the tip 36h is accommodated inside the pressing member 35A. Thereby, the removed cover assembly 32A can be placed on the upper surface 102A of the tank 100A, etc., and the maintainability is improved.

According to the present embodiment, the height of the pressing member 35A is lowered, and the column portion 33c is inserted into the hollow portion of the flange portion 31A, and the flow path 61A is provided in the column portion 33c. Can be miniaturized. In particular, by providing the cylindrical portion 33c on the plate-like portion 33A, the lid body 30A can be lowered (lower head).

Further, according to the present embodiment, the pressing member main body 35m is provided with the cylindrical body 35n to form the pressing member 35A. Therefore, the pressing member 35A can have a simple structure.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention. . For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, a part of the configuration of the embodiment can be replaced with the configuration of the other embodiment, and other configurations can be added to, deleted from, or replaced with the configuration of the embodiment.

In addition, “substantially” is a concept that includes not only the case of being exactly the same but also errors and deformations that do not lose the identity. For example, the “substantially cylindrical shape” is not limited to a strictly cylindrical shape, and is a concept including a case where it can be identified with a cylindrical shape, for example. Further, for example, when simply expressing as orthogonal, parallel, coincidence, etc., not only strictly orthogonal, parallel, coincidence, etc. but also cases of substantially parallel, substantially orthogonal, substantially coincidence, etc. are included.

Also, “neighboring” means including an area of a certain range (which can be arbitrarily determined) near the reference position. For example, in the case of the vicinity of the end, it is a concept indicating that the region is in a certain range near the end and may or may not include the end.

1, 2: Return filter 10: Case 11: Side surface 12: Inlet 13: Bottom surface 15: Outflow portion 20, 20A: Filter element 21: Filter medium 22: Outer cylinder 23: Inner cylinder 24, 24A, 25: Plate 26: Seal Member 30, 30A: Cover 31, 31A: Flange 31a: Hole 31b, 31c, 31d, 31f: Hole 31e: Peripheral surface 31g: Convex 32, 32A: Cover assembly 33, 33A: Plate-like part 33a: Hole 33b: concave portion 33c: cylindrical portion 34, 34A: insertion portion 35, 35A: pressing member 35a: cylindrical portion 35b: flat portion 35c, 35e: positioning portion 35d, 35f: notch portion 35g: flat portion 35h: cylindrical portion 35i: Flange part 35j: Seal member 35m: Press part main body 35n: Tubular part 36, 36A: Valve 36a: Rod 36b, 36o: Valve body 36c, 36p: Valve body 36d: Elastic member 36e, 36q: Fixing portion 36f, 36g, 36k: Hole 36h: Tip 37: Elastic member 38, 39: Seal member 61, 61A: Flow path 63 : Detection unit 100, 100A: Tank 101: Bottom surface 101a: Outflow part 102, 102A: Upper surface 102a: Opening part 102b: Thick part 102c: Mounting member 103: Side surface 104: Inflow part 105: Partition plate

Claims

A filter device provided in a tank having an opening on an upper surface,
A substantially bottomed cylindrical case provided inside the tank;
A filter element provided inside the case, the filter element having a substantially cylindrical filter medium, and an upper plate provided at an upper end of the filter medium;
A lid provided on the upper side of the tank so as to cover the opening, and a substantially cylindrical flange portion detachably provided on the tank, and a cover assembly detachably provided on the flange portion A lid having a solid; and
A detecting portion provided on the flange portion;
With
The diameter of the hole of the flange portion is larger than the diameter of the filter element,
On the outer peripheral surface of the flange portion, a hole in which the detection portion is provided toward the radially inner side is formed,
The cover assembly includes a substantially plate-like plate-like portion provided in the flange portion so as to cover a hollow portion of the flange portion, and an insertion portion provided in the plate-like portion and inserted into the case. And having
At the end opposite to the plate-like part of the insertion part, a pressing member having a substantially annular plane part is provided,
A filter device, wherein a substantially annular seal member is provided between the upper plate and the pressing member.
The filter device according to claim 1,
The cover assembly includes an elastic member having both ends provided on the plate-like portion and the pressing member, and a valve provided on the plate-like portion,
The valve has a substantially cylindrical valve body provided in the plate-like portion,
The pressing member is provided to be movable with respect to the valve body,
In a state where the cover assembly is attached to the flange portion, the elastic member is deformed so that the flat portion presses the filter element,
The valve body is configured such that when the elastic member is not deformed, the tip of the valve does not protrude from the pressing member, and when the elastic member is deformed, the valve tip protrudes from the pressing member. A filter device, characterized in that it is formed.
The filter device according to claim 2,
A first sealing member is provided between the cover assembly and the flange portion,
A second seal member is provided between the valve body and the pressing member,
The deformation amount of the second seal member is less than the deformation amount of the first seal member, or the deformation amount of the first seal member and the deformation amount of the second seal member are substantially the same, The filter device, wherein the hardness of the second seal member is softer than the hardness of the first seal member.
The filter device according to claim 2 or 3,
The pressing member is movable in the vertical direction along the outer peripheral surface of the valve body, and is movable so as to be inclined with respect to the valve body,
On the outer peripheral surface of the pressing member, a substantially cylindrical positioning portion is provided so as to protrude downward,
Along the inner peripheral surface of the positioning portion, an outer peripheral surface of the upper plate is provided,
The tip of the positioning part is cut out so that the height on the inner peripheral surface side is low and the height on the outer peripheral surface side is high.
The filter device according to claim 2 or 3,
The pressing member is movable in the vertical direction along the outer peripheral surface of the valve body, and is movable so as to be inclined with respect to the valve body,
The pressing member is provided with a substantially cylindrical positioning portion so as to protrude downward,
Along the outer peripheral surface of the positioning portion, an inner peripheral surface of the upper plate is provided,
The tip of the positioning part is cut out so that the height on the outer peripheral surface side is low and the height on the inner peripheral surface side is high.
A filter device according to any one of claims 2 to 5,
The pressing member is provided on a lower side of the pressing portion main body, and a pressing portion main body having a substantially cylindrical tubular portion and a substantially annular ring plate portion provided outside the cylindrical portion. A cylindrical body,
The cylindrical portion is provided along the outer peripheral surface of the valve body,
The annular plate part has the plane part. A filter device characterized by things.