JP7454941B2 - Filter element and filter container - Google Patents

Description

The present invention relates to a filter container and a filter element contained therein.

BACKGROUND ART In fluid filtration, it has become common to use a removable and replaceable filter container to filter fluids. Such a filter container has a built-in filter element incorporating a filter material, and performs filtration by forming a flow of fluid inside the filter container so as to pass through the filter material of the filter element. Various configurations of the filter medium in the filter element are applicable, and a typical filter element includes a cylindrical filter medium formed by winding the filter medium around a core material. This type of filter element is used by forming a flow such that fluid flows into the filter medium from the cylindrical outer peripheral surface and filtered fluid flows out from the inner peripheral surface, or vice versa.

For such a filter element, for example, as shown in Patent Document 1, fluid is introduced into the filter container from an inlet provided at one end of a container containing the filter element (hereinafter referred to as a filter container), and then the fluid is introduced into the filter container from the opposite side. There is a filter container that removes the filtered fluid through an outlet provided at its end. In a filter container in which the inlet and the outlet are arranged on opposite sides in this manner, the variation in distance difference is relatively small in all the paths from the inlet to the outlet. That is, for example, there is no difference in distance between the P1 route and the P2 route in FIG. 5A. Therefore, there is relatively little variation in the difference in distance between the flow path P1 in FIG. 5A and the flow path P2 in FIG. The amount of fluid becomes uniform and the fluid to be filtered tends to spread throughout the filter medium of the filter element. If the inlet and outlet can be selected in this way, the entire area of the filter medium of the filter element can be used efficiently, which is advantageous from the viewpoint of filtration efficiency and the life of the filter element.

On the other hand, some filter containers have an inlet and an outlet located on the same side of the filter container. If the filter container is configured to be easily removable in the flow circuit of the fluid to be filtered, it is very advantageous if the inlet and the outlet can be arranged on the same side of the filter container. Filter vessels in which the filters are located on the same side are particularly common. When a filter element in which the filter material is wound around the core material to form a cylindrical filter material is applied to a filter container in which the inflow port and the outflow port are arranged on the same side, the following problems occur. be.

International Publication No. WO99/56851 Pamphlet

In a filter container in which the inlet and outlet are arranged at one end on the axis of the cylindrical filter medium of the filter element, the variation in distance difference is relatively small over all paths from the inlet to the outlet. growing. In such a container, the fluid behaves in such a way that it follows a path as short as possible. Therefore, for example, as shown in FIG. 5B, the fluid behaves so that the inlet and outlet become closer, and the fluid flow in this path (P3 in FIG. 5B) becomes stronger. It is difficult for the fluid to flow in the path away from the path, and the fluid flow in this path (P4 in FIG. 5B) tends to be weak. Therefore, the filter element of the filter element closer to the inlet and outlet filters more frequently, while the filter element of the filter element farther from the inlet and outlet filters less frequently. Therefore, the filtration function of the filter element on the side closer to the inlet and outlet is consumed faster than the filtration function of the filter element on the side farther from the inlet and outlet. The life of a filter element is planned on the assumption that the entire area of the filter medium is used evenly and evenly, but the filter element is equipped with a cylindrical filter medium in a filter container in which the inlet and outlet are located on the same side. When a filter element is applied, the fluid path near the inlet and outlet is used more, and only this region becomes clogged with filtered impurities, which impedes the filtration function of the filter medium of the filter element at this location. There is a problem that the filter element wears out quickly and the life of the filter element becomes shorter than the expected life. Therefore, a filter element with a filter medium in which filtration can be carried out using the entire area of the filter medium, i.e. a cylindrical body in a filter vessel, even if the inlet and the outlet are arranged on the same side of the filter vessel. Where applicable, a filter element is desired that eliminates variation in the length of the total flow path taken by the fluid within the filter.

A filter element used by being stored inside a filter container having an inlet and an outlet for introducing a fluid to be filtered on the same side, the filter element being a cylindrical core body having a hollow part. , a cylindrical core body with fluid communication between an outer surface and an inner surface, and a cylindrical core body arranged in a cylindrical shape around the outer surface of the cylindrical core body, and arranged to form an outer peripheral surface on the outside of the cylindrical core body. A filter medium is inserted into the hollow part of the cylindrical core, and extends so that its outer surface has a gap with the inner surface of the cylindrical core, and guides the fluid from one end of the cylindrical core to the other end. a central pipe; and a collision plate disposed on the other end side of the central pipe and having a plane perpendicular to the central axis of the central pipe, which allows the fluid guided by the central pipe to pass through the central pipe. The entire circumference of the edge of the end portion is joined to the terminal end of the hollow portion of the cylindrical core, so that the fluid introduced into the central pipe does not flow into the hollow portion of the cylindrical core. The fluid that has collided with the collision plate is guided to a flow path defined between the outer circumferential surface of the filter medium and the filter container, and the fluid that has flowed into the flow path is guided to a flow path defined between the outer peripheral surface of the filter medium and the filter container. It is introduced into the filter medium from the outer circumferential surface of the filter medium, passes through the inside of the filter medium, is filtered, and flows into the hollow part from the inner surface of the cylindrical core body, and flows into the outer surface of the central pipe and the hollow part of the cylindrical core body. The filter element is discharged from the outlet through a gap defined between the filter element and the outlet.

In another aspect, a filter element is used while being stored inside a filter container having an inlet and an outlet for introducing a fluid to be filtered on the same side, the filter element having a hollow part. a cylindrical core having an outer surface and an inner surface in fluid communication; a cylindrical core arranged in a cylindrical shape around the outer surface of the cylindrical core, and an outer circumferential surface on the outside of the cylindrical core; A filter medium is inserted into the hollow part of the cylindrical core, and extends from one end of the cylindrical core so that the outer surface thereof has a gap with the inner surface of the cylindrical core. a central pipe that guides the fluid to the other end; a collision plate that is disposed on the other end side of the central pipe and has a plane perpendicular to the central axis of the central pipe, and that directs the fluid guided by the central pipe; , the entire circumference of the edge of the end of the central pipe is joined to the terminal end of the hollow part of the cylindrical core, so that the fluid introduced into the central pipe flows through the rim of the cylindrical core. The fluid collides with the collision plate without flowing into the hollow part, and the fluid that collides with the collision plate is guided to a flow path defined between the outer circumferential surface of the filter medium and the filter container, and the fluid collides with the collision plate. The fluid that has flowed into the filter medium is introduced into the filter medium from the outer circumferential surface of the filter medium, passes through the inside of the filter medium, is filtered, and flows from the inner surface of the cylindrical core body into the hollow portion, and flows between the outer surface of the central pipe and the A filter container is formed to be sealed so as to contain a filter element that passes through a gap defined between the hollow portion of the cylindrical core body and is discharged from the outlet, the filter container being The problem is solved by a filter container that has an inlet and an outlet on the same side and is detachable at a predetermined point in the fluid circuit of the fluid.

In a further aspect, the filter element is used while being stored inside a filter container having an inlet and an outlet for introducing a fluid to be filtered on the same side, the filter element having a hollow part. a cylindrical core, the outer surface and the inner surface of which are in fluid communication; A filter medium is inserted into the hollow part of the cylindrical core body, and extends so that the outer surface thereof has a gap with the inner surface of the cylindrical core body, and the filter medium is inserted into the hollow part of the cylindrical core body, and extends from one end of the cylindrical core body to the other end. a central pipe that guides the fluid to an end; and a collision plate that is disposed on the other end side of the central pipe and has a plane perpendicular to the central axis of the central pipe that conducts the fluid guided by the central pipe. The entire periphery of the edge of the end of the central pipe is joined to the terminal end of the hollow part of the cylindrical core, so that the fluid introduced into the central pipe flows into the hollow of the cylindrical core. The fluid that collided with the collision plate is guided to a flow path defined between the outer circumferential surface of the filter medium and the filter container, and the fluid collides with the collision plate without flowing into the flow path. The flowing fluid is introduced into the filter medium from the outer circumferential surface of the filter medium, passes through the inside of the filter medium, is filtered, and flows into the hollow part from the inner surface of the cylindrical core body, and is connected to the outer surface of the central pipe and the cylinder. A filter container that can replaceably incorporate a filter element that passes through a gap defined between the core body and the hollow portion and is discharged from the outlet, and forms a part of the fluid circuit for the fluid. Accordingly, the filter container is provided with the inlet and the outlet on the same side.

According to the present invention, a filter element is realized in which the length of the flow path of the fluid to be filtered is uniform so that filtration can be performed using the entire area of the filter medium.

1 shows a perspective view of a filter element according to an embodiment of the present invention. 1 is a perspective view of a filter container of Example 1 in which a filter element according to an embodiment of the present invention is incorporated; FIG. FIG. 3 is a sectional view taken along section XX in FIG. 2 of a filter element and a filter container according to an embodiment of the present invention. FIG. 3 is a cross-sectional view in Example 2 of a filter element and a filter container according to an embodiment of the present invention. FIG. 3 is a diagram schematically showing the flow of fluid in a filter container in which an inlet and an outlet are arranged on opposite sides of the filter container. FIG. 2 is a diagram schematically showing the flow of fluid in a filter container in which an inlet and an outlet are arranged on the same side of the filter container.

With reference to FIGS. 1 to 3, a filter container 1 of Example 1 will be described as an embodiment of the present invention. FIG. 1 is a perspective view of a filter element 3 of the present invention. FIG. 2 is a perspective view of the filter container 1 containing the filter element 3, in which the filter container 1 itself functions as a cartridge. In FIG. 1, a part of the outer container of the filter container 1 is cut away to show the inside. FIG. 3 is a sectional view of the filter container 1 taken along the section XX in FIG. The filter container 1 is used while being fixed to the filter container holder 5, and in FIGS. The container holder 5 is shown separately. In reality, the filter container 1 is used by being detachably attached to the filter container holder 5, as shown by the dashed-dotted lines in FIGS. 2 and 3. Moreover, the arrows in FIG. 3 indicate the flow of the fluid to be filtered.

The filter container 1 includes, for example, a main body shell 11 that is a cylindrical outer container with a hollow interior, a vent cap 12 for venting air from the inside, and a complementary shape that matches the contour shape of the inner surface 5a of the filter container holder 5. and a shell cap 13 having an outer surface 13a having an outer shape. The main body shell 11 typically has a cylindrical cross section with a central axis defined. The filter container holder 5 includes an upstream pipe line 51 that is part of a flow circuit through which a fluid to be filtered flows and for introducing the fluid into the filter container 1, and an upstream pipe line 51 for introducing the fluid into the filter container 1, and an upstream pipe 51 for introducing the fluid into the filter container 1. A downstream pipe line 52 for recovery is provided. On the bottom surface of the filter container holder 5, the upstream pipe line 51 and the downstream pipe line 52 form an inflow hole 51a, and the downstream pipe line 52 forms an outflow hole 52a.

The filter container 1 has a capsule shape whose interior can be sealed by a main body shell 11, a vent cap 12 for venting air from the inside, and a shell cap 13. The bottom surface of the shell cap 13 has an inflow hole 51a and an outflow hole 52a when the filter container 1 is fitted into the filter container holder 5 so that the outer surface 13a of the filter container 1 matches the inner surface 5a of the filter container holder 5. It has an inflow port 1a and an outflow port 1b which respectively correspond to the above.

A filter element 3 is arranged in a hollow portion inside the filter container 1 . The filter element 3 includes a cylindrical core body 31 having a cylindrical shape. The cylindrical core body 31 is a member that functions as a cylindrical core rod having a hollow portion, and is a pipe-shaped member with fluid communication between an outer surface 31a and an inner surface 31b. The filter medium 33 can be freely set, such as a nonwoven fabric, according to the fluid to be filtered, and the filter medium 33 is arranged in a cylindrical shape around the outer surface 31a of the cylindrical core body 31. Typically, it is arranged in a wound manner, and the central axis of the cylindrical core body 31 is defined as the central axis of the filter element 3, and the outer circumferential surface of the filter medium 33 is located outside the cylindrical core body 31 and the outer circumferential surface of the filter element 3. Form 3a.

Alternatively, the outer cover 32 may be disposed outside the cylindrical core 31, such as in a double pipe in which the cylindrical core 31 serves as a central tube serving as an inner cover. The cylindrical core body 31 serving as the inner cover and the outer cover 32 are arranged so that their respective central axes become concentric axes, forming a double cylindrical shape. The central axis of the outer cover 32 and the central axis of the cylindrical core body 31, which are concentric axes, are defined as the central axis of the filter element 3. In this form, a plurality of openings are formed in the surfaces of the cylindrical core body 31 and the outer cover 32, a filter medium 33 is arranged between the cylindrical core body 31 and the outer cover 32, and the cylindrical core body 31 and the outer cover 32 functions as a holding member for the filter medium 33. The filter medium 33 may be made of non-woven fabric, for example, and can be freely selected according to the fluid to be filtered. The fluid to be filtered is introduced into the outer cover 32 from the opening of the outer cover 32, passes through the filter medium 33, and flows out from the opening of the cylindrical core body 31. As described above, the filter element 3 may have a structure in which the filter medium 33 is simply wound around the cylindrical core body 31. In this case, for example, a cloth-like nonwoven fabric serving as a filter medium is wound around and fixed to the cylindrical core body 31, and the outer circumferential surface 3a of the filter element 3 becomes the outer circumferential surface of the filter medium 33. On the other hand, an outer cover 32 may be arranged outside the cylindrical core body 31 like a double pipe, and a filter medium may be arranged therebetween. In this case, the outer circumferential surface 3a of the filter element 3 becomes an outer cover 32, and a filter medium 33 is placed between the outer cover 32 and the cylindrical core 31 (between the path from the outer cover 32 to the hollow part of the cylindrical core 31). is placed. In either case, the fluid to be filtered flows into the filter element 3 from the outer peripheral surface 3 a of the filter element 3 and reaches the hollow portion of the cylindrical core body 31 . That is, any configuration may be used to arrange the filter medium 33 as long as it flows into the filter element 3 from the outer circumferential surface 3 a of the filter element 3 and reaches the hollow portion of the cylindrical core body 31 . Hereinafter, as a representative example, an example in which the outer cover 32 is arranged will be explained.

One end of the filter element 3, which is one end of the outer cover 32 and the cylindrical core body 31, is sealed with a circular top plate 34. Further, the other ends of the outer cover 32 and the cylindrical core body 31, which are the opposite ends of the filter element 3 that are opposite to the top plate 34, are sealed with a circular base plate 35. Therefore, the filter medium 33 disposed between the outer cover 32 and the cylindrical core 31 has a structure in which fluid does not flow into or out of both ends in the central axis direction of the outer cover 32 and the cylindrical core 31. be. That is, in the filter element 3 , fluid does not flow into or out of the filter medium 33 from the direction along the central axis of the filter element 3 , and the fluid to be filtered flows into the filter medium 33 only from the outer periphery of the filter element 3 . The fluid to be filtered flows out of the filter medium 33 only from the inner periphery of the filter medium 33.

The filter element 3 is fixed within the filter container 1 by fixing the base plate 35 within the main body shell 11 of the filter container 1 . At this time, typically, the filter element 3 is fixed so as to be independent within the filter container 1 such that the central axis of the main body shell 11 of the filter container 1 and the central axis of the filter element 3 form a concentric axis. . Further, this central axis direction is the vertical direction.

A central pipe 4 is arranged inside the cylindrical core 31 so as to extend in the central axis direction of the cylindrical core 31 . The central pipe 4 is inserted into the hollow part of the cylindrical core body 31, and arranged so that the outer surface of the central pipe 4 is inserted and extends so as to have a gap with the inner surface 31b of the cylindrical core body 31. It functions to direct fluid from one end of 31 to the other. There is no opening penetrating the front and back sides of the central pipe 4 on the wall surface of the central pipe 4, and the outer surface and the inner surface of the central pipe 4 are separated from each other. A hole 34a having approximately the same diameter as the diameter of the central pipe 4 is bored in the center of the top plate 34, and the entire circumference of one end of the central pipe 4 is fixed to the hole 34a so as to fit tightly into the opening 4a. is formed. The side of the filter element 3 where the opening 4a is formed is defined as the upper side in the vertical direction. A hole 35a having a diameter larger than that of the central pipe 4 is bored in the center of the base plate 35, and the central pipe 4 passes through the hole 35a of the base plate 35. A gap is formed between the outer periphery of the central pipe 4 and the base plate 35 to define a flow path cross section. The other end of the center pipe 4, which is opposite to one end of the center pipe 4 fixed to the top plate 34, reaches the shell cap 13 and is fixed thereto. As described above, the shell cap 13 side may have a pipe extending so as to be connected to the central pipe 4. The opening 4b at the other end of the central pipe 4 is defined as an opening in the shell cap 13 as an inlet 1a. The central pipe 4 may be a single pipe member or may be a pipe formed by connecting a plurality of pipes. When the central pipe 4 is composed of a plurality of pipes, a part thereof may be formed as a member on the filter container side and connected to the central pipe 4 of the filter element 3. That is, in FIG. 1, the central pipe 4 is configured to extend for a long time so as to protrude from the end surface of the filter element 3, but the length is the same as the end surface of the filter element 3, and the other part is placed on the side of the filter container 1. They may be connected as members.

A collision plate 36 is arranged above the filter element 3 in which the opening 4a of the central pipe 4 is formed. The collision plate 36 is disposed on one end side of the central pipe 4 (on the downstream side of the fluid flow), and is disposed so as to have a plane perpendicular to the central axis of the central pipe 4 so that the fluid guided by the central pipe 4 can flow through the collision plate 36 . The collision plate 36 has a shape larger than the inner diameter of the central pipe, and is typically a disk. The collision plate 36 is fixed to the top plate 34 so that the central axis of the collision plate 36 is concentric with the central axis of the filter element 3 and a gap is formed between the top plate 34 and the collision plate 36. Ru. Collision plate 36 is typically secured to top plate 34 with four legs 36a, 36b, 36c, and 36d. The lengths of the four legs 36a, 36b, 36c, and 36d become gaps formed between the top plate 34 and the collision plate 36, forming a flow that spreads outward in the radial direction of the filter element 3. Define the flow path cross section. The entire circumference of the edge on one end side of the central pipe 4 is joined to the terminal end of the hollow portion of the cylindrical core body 31. As a result, the fluid introduced into the central pipe 4 always collides with the collision plate 36 without flowing into the hollow portion of the cylindrical core body 31. In FIG. 1, the length of the central pipe 4 is drawn longer than the end opposite to the collision plate 36, but as shown in FIG. On the one hand, the length of the central pipe 4 is shortened, and on the other hand, a pipe is arranged on the inflow hole 51a side, and connected to it to form the central pipe 4. As shown in FIGS. 2 and 3, the central pipe is formed by a plurality of members. It may also be configured as a pipe 4.

A discharge channel 37 is defined in the base plate 35 on the opposite side to the side where the filter medium 33 is arranged. The entire space between the outer periphery of the central pipe 4 and the hole 35a of the base plate 35 is connected to the discharge passage 37. The entire flow path of the discharge flow path 37 is connected only to the outlet 1b and does not communicate with anything other than the outlet 1b. The filter element 3 is fixed by the base plate 35 such that a gap is defined between the outside of the outer circumferential surface of the outer cover 32, that is, the outside of the outer circumferential surface of the filter element 3 and the inner wall surface of the main body shell 11 of the filter container 1. This gap functions as a flow path cross section. A curved surface is formed on the inner side of the main body shell 11 of the filter container 1 at the height of the gap formed between the top plate 34 and the collision plate 36. This curved surface allows the flow, which is formed to spread outward in the radial direction of the filter element 3 due to the gap formed between the top plate 34 and the collision plate 36, to the outside of the outer peripheral surface of the filter element 3 and the filter. It functions as a flow path curved surface 11a that leads to the gap between the inner wall surface of the main body shell 11 of the container 1 and the inner wall surface of the main body shell 11 of the container 1.

Next, how the fluid to be filtered guided from the inflow hole 51a of the upstream pipe line 51 behaves inside the filter container 1 in the present invention in relation to the filter element 3, A description will be given of how the water is discharged from the outflow hole 52a of the downstream pipe line 52. The arrows in Figure 3 indicate this flow behavior. Here, an example in which the inflow hole 51a of the upstream pipe line 51 and the outflow hole 52a of the downstream pipe line 52 are arranged vertically downward, and the filter element 3 is attached so that the collision plate 36 is located vertically upward. It is explained in However, the inflow hole 51a of the upstream pipe line 51 and the outflow hole 52a of the downstream pipe line 52 may be arranged vertically upward, and the filter element 3 may be attached so that the collision plate 36 is located vertically downward. . In the case where the inlet hole 51a of the upstream pipe line 51 and the outlet hole 52a of the downstream pipe line 52 are arranged vertically downward, the collision plate 36 further collides with the outside of the outer peripheral surface of the filter element 3 and the main body of the filter container 1. The flow introduced into the gap between the inner wall surface of the shell 11 flows as a downward flow between the outside of the outer circumferential surface of the filter element 3 and the inner wall surface of the main body shell 11 of the filter container 1, so that the flow is more effective against the filter element 3. An additional effect can be produced that reaches far beyond the outer circumferential surface of.

When the filter container 1 is firmly fixed in close contact with the filter container holder 5, the inflow hole 51a and the inflow port 1a communicate with each other, and the outflow hole 52a and the outflow port 1b communicate with each other. The fluid in the upstream conduit 51 flows only into the central pipe 4 from the inflow hole 51a, and flows upward toward the top of the filter element 3 in the vertical direction based on the pressure in the upstream conduit 51. No fluid flows out of the central pipe 4. The fluid that has risen to the upper opening 4a of the central pipe 4 collides with the collision plate 36 and flows out through the gap between the top plate 34 and the collision plate 36 so as to spread outward in the radial direction of the filter element 3. The flow expanding outward in the radial direction of the filter element 3 is guided by the flow path curved surface 11a on the inner surface of the main body shell 11 and flows between the outer circumferential surface of the filter element 3 (the outer circumference of the outer cover 32) and the inner surface of the main body shell 11. The flow appears to flow through the gap between the two. The flow in the gap between the outer circumferential surface of the filter element 3 (the outer circumference of the outer cover 32 ) and the inner surface of the main body shell 11 is introduced into the inside of the outer cover 32 from the opening of the outer cover 32 of the filter element 3 and passes through the filter medium 33 . Then, it flows out from the opening of the cylindrical core body 31 into the inside of the filter medium 33. The fluid flowing out from the opening of the cylindrical core 31 flows through the gap between the cylindrical core 31 and the central pipe 4, passes through the hole 35a of the base plate 35, and flows out into the discharge channel 37. The fluid flowing out of the discharge channel 37 passes through the outlet 1b, reaches the downstream pipe 52 from the outlet hole 52a, and is recovered as a filtered fluid.

In the configuration of the present invention, the fluid that has risen to the highest point in the vertical direction in the central pipe 4 reaches the outer peripheral surface of the filter element 3 without passing through the inner peripheral surface of the filter element 3, and in the axial direction of the filter element. There is no need to pass through the edges and there is no contact with the filter medium 33. The fluid whose flow direction is bent by the flow path curved surface 11a reaches the outer circumferential surface of the filter element 3 for the first time and touches the filter medium 33, so that the fluid can easily spread to the farthest bottom of the filter element 3. This prevents the fluid from touching the filter medium 33 near the inlet 1a, which is the shortest part from the inlet 1a, and allows the fluid to reach the filter medium 33 of the filter element 3 near the outlet 1b, which is farthest from the inlet 1a. . This makes it possible to utilize the entire area of the filter medium 33, leading to the effect of extending the life of the filter medium 33.

As Example 1, a filter container 1 in which the filter container 1 itself functions as a cartridge has been described. The filter container 1 of Example 1 is formed in a sealed manner so as to house the filter element as described above, and functions as a filter container that can be attached and detached at a predetermined point in the fluid circuit for the fluid to be filtered. The container 1 is not necessarily limited to this. Embodiment 2 is a filter container in which the filter element functions as a replaceable cartridge, can house the filter element 3 as the cartridge, and is configured to form a part of the fluid circuit for the fluid. It may be. In this case, in the former case (Embodiment 1), the filter container 1 has a sealed structure, and the filter container 1 itself can be replaced as a cartridge, and an assembly is provided in which the filter container 1 can be detached from the fluid circuit for the fluid to be filtered. It is sufficient if it is placed. On the other hand, in the latter case (Embodiment 2), the filter element 3 is replaceable and the filter container 1 is fixedly arranged so as to form part of the fluid circuit for the fluid to be filtered. In this case, the filter container 1 is not of a sealed structure, but is of a form in which the filter element 3 is attached and detached while opening and closing the lid of the filter container 1 when the filter element 3 is attached and detached. Any filter container 1 is not limited as long as it has an inlet and an outlet for introducing the fluid to be filtered on the same side. However, in the case of the first embodiment, the filter container 1 is often made of resin, and in the case of the second embodiment, the filter container is often made of metal. However, there are no restrictions on the materials. There is no difference in the structure of the filter element 3 between the first embodiment and the second embodiment. That is, in the second embodiment, the filter container 1 is configured to include a main body shell 6, which is a cylindrical outer container with a hollow interior, and a holder 7, as shown in FIG. 3 may be configured to be attachable. In this case, the filter element mounting structure 7a is arranged in the holder 7. When the filter element 3 is attached to the filter element attachment structure 7a, a flow path is formed between the main body shell 6 and the filter element 3, and the flow circuit of the first embodiment is completed. As in the first embodiment, the holder 7 includes an upstream pipe line 71 and a downstream pipe line 72 for recovering the filtered fluid. The main body shell 6 and the holder 7 are fixed, for example, by sandwiching a flange 6a disposed on the main body shell 6 and a flange 7b disposed on the holder 7 with a fixing ring (not shown). In addition, the main body shell 6 and the holder 7 are fixed with a flange or the like and sealed, and in this state, the internal flow has the same structure as in the first embodiment.

1 Filter container 1a Inflow port 1b Outflow port 3 Filter element 4 Central pipe 5 Filter container holder 6, 11 Main body shell 7 Holder 12 Vent cap 13 Shell cap 31 Cylindrical core body 32 Outer cover 33 Filter medium 34 Top plate 35 Base plate 36 Collision plate 37 Discharge channel 51 Upstream pipeline 52 Downstream pipeline 51a Inflow hole 52a Outflow hole 71 Upstream pipeline 72 Downstream pipeline

Claims (5)

A filter element used while being stored inside a filter container having an inlet for a fluid to be filtered and an outlet for the fluid in a vertically downward direction, the filter element comprising:
a cylindrical core body having a hollow portion, the outer surface and the inner surface of which are in fluid communication;
a filter medium arranged in a cylindrical shape around the outer surface of the cylindrical core;
A central pipe having a vertical lower end communicating with the inlet and a vertical upper end, the central pipe having a gap defined between an outer surface of the central pipe and an inner surface of the cylindrical core. a central pipe inserted into and extending from the hollow part of the cylindrical core body so as to guide the fluid introduced from the lower end toward the upper end;
a collision plate disposed above the upper end of the central pipe and having a plane perpendicular to the direction in which the central pipe extends, the collision plate being guided from the lower end of the central pipe to the upper end; a collision plate arranged so that the fluid flowing out from the upper end collides with the plane,
The gap does not communicate with the central pipe, but the lower end of the gap communicates with the outlet, and the fluid flowing out from the upper end of the central pipe flows between the gap and the upper end of the cylindrical core. The fluid introduced from the inlet to the lower end of the central pipe flows toward the upper end of the central pipe and collides with the collision plate; The fluid that has collided with the collision plate is guided into a flow path defined between the outer circumferential surface of the filter medium and the filter container and becomes a downward flow, and the fluid that has flowed into the flow path is caused to flow downward toward the outer circumference of the filter medium. A filter element that is introduced from the surface into the filter medium, passes through the inside of the filter medium, is filtered, flows into the gap from the inner surface of the cylindrical core, passes through, and is discharged from the outlet. The filter element according to claim 1,
The structure is a top plate that seals the gap and the filter medium on the side of the upper end of the central pipe and the upper end of the cylindrical core,
The fluid that has collided with the collision plate is guided along the top plate to the flow path defined between the outer peripheral surface of the filter medium and the filter container,
A filter element in which the arrangement of the filter medium is wound around and attached to the cylindrical core, and the outer peripheral surface of the filter element forms the filter medium. The filter element according to claim 1,
The cylindrical core body includes a cylindrical outer cover disposed concentrically with the cylindrical core body, the filter medium is disposed between the inside of the outer cover and the cylindrical core body, and the cylindrical core body and the outer cover Each of the filter elements has an opening that guides fluid from the outer circumferential surface of the filter element to the filter medium and into the hollow portion inside the cylindrical core. A filter container that is sealed and formed to house the filter element according to any one of claims 1 to 3, and is detachable at a predetermined location in a fluid circuit for the fluid. A filter container that can replaceably incorporate the filter element according to any one of claims 1 to 3 and forms a part of a fluid circuit for the fluid.

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