In-line filter

Abstract

The object of this invention is to provide an inline filter that can more reliably prevent the concentrated adhesion and accumulation of solid foreign matter in a part of the filter. In the inline filter of this invention, the outer casing 9 includes: a hollow cylindrical wall 24 extending vertically, and a top wall 25 sealing the upper end of the cylindrical wall 24. The filter chamber 8 is divided into a primary flow path chamber 39 formed on the upper side and communicating with the inlet 6, and a secondary flow path chamber 40 formed on the lower side and communicating with the outlet 7, and a through hole 38 is provided between the two chambers 39 and 40. The filter 10 includes: a hollow cylindrical filter tube 33 with openings at both ends and elongated vertically, and a bottom cover 34 sealing the lower opening of the filter tube 33; and an inlet 36 for allowing liquid to enter is formed at the upper end of the filter tube 33. The filter 10 is disposed in the filter chamber 8 with the inlet 36 facing the through hole 38, and the outlet 7 is opened on the cylinder wall 24 facing the lower half of the filter cylinder 33.

Description

Technical Field

[0001] This invention relates to an inline filter that is assembled into a liquid flow pipeline and filters out solid foreign matter contained in the liquid. Background Technology

[0002] The main purpose of the strainer of the present invention is to prevent solid foreign matter (filter residue) from accumulating and adhering to the filter cylinder forming the screen near the outlet. Patent Document 1 discloses a filter with the same purpose. In the filter of Patent Document 1, the inlet for liquid inflow and the outlet for liquid outflow are coaxially arranged, and a shell (filter body) having a filter chamber (receiving chamber) is provided between the inlet and the outlet. The filter (filter) provided inside the filter chamber has a filter screen formed into a cylindrical shape and a circular plate-shaped bottom plate disposed at the lower end of the filter screen, forming a bottomed cylindrical shape with an opening at the top. When the filter is installed and fixed in the filter chamber, the upper half of the filter faces the outlet. Inside the filter, a spiral plate for fluid control is provided, so that the fluid flowing into the filter flows downward while swirling along the spiral plate, thereby filtering not only above the filter screen but throughout the entire filter screen.

[0003] [Existing technical documents]

[0004] [Patent Literature]

[0005] [Patent Document 1] Microfilm of Japanese Patent No. 60-91902 (Patent No. 62-1714). Summary of the Invention

[0006] [The problem that the invention aims to solve]

[0007] As mentioned above, the filter in Patent Document 1 utilizes a spiral plate located inside the filter to cause the fluid flowing into the filter to swirl and flow downwards, thereby filtering not only above the filter screen but throughout the entire filter screen. However, because Patent Document 1's configuration places the spiral plate inside the filter, solid foreign objects easily adhere to it. When solid foreign objects adhere to the spiral plate in this way, the smooth flow of fluid inside the filter is obstructed by the spiral plate, which may instead cause solid foreign objects to accumulate in the upper part of the filter.

[0008] The purpose of this invention is to provide an inline filter that can more reliably prevent solid foreign matter from adhering and accumulating in a part of the filter.

[0009] [Methods for solving the problem]

[0010] The inline strainer of the present invention comprises: a housing 9 having an inlet 6 for liquid inflow, an outlet 7 for filtered liquid outflow, and a filter chamber 8 connected from the inlet 6 to the outlet 7; and a screen 10 disposed within the filter chamber 8 for filtering the liquid flowing in from the inlet 6. The housing 9 includes: a hollow cylindrical wall 24 extending vertically, and a top wall 25 sealing the upper end of the cylindrical wall 24. The filter chamber 8 is divided into a primary flow path chamber 39 formed on the upper side and communicating with the inlet 6, and a secondary flow path chamber 40 formed on the lower side and communicating with the outlet 7, and a through hole 38 is provided between the two chambers 39 and 40. The filter 10 includes a filter cylinder 33 with openings at both ends, which is a hollow cylindrical shape that is elongated in the vertical direction, and a bottom cover 34 that seals the lower opening of the filter cylinder 33. An inlet 36 is formed at the upper end of the filter cylinder 33 to allow liquid to enter. The filter 10 is disposed in the filter chamber 8 with the inlet 36 facing the through hole 38, and the outlet 7 is opened on the cylinder wall 24 facing the lower half of the filter cylinder 33.

[0011] When the extension direction of the cylinder wall 24 is defined as the cylinder axis HC and the extension direction of the filter cylinder 33 is defined as the cylinder axis SC, the two axes HC and SC coincide. On the inner circumferential surface of the cylinder wall 24 that separates the secondary flow path chamber 40, there is a spirally inclined downward spiral protrusion 43.

[0012] The inline filter includes a connecting pipe 44 that is formed to rotate and tilt upwards along the outer circumferential surface of the cylinder wall 24 from the outlet 7. The inline filter is configured such that, when viewed from above, the upward tilting rotation direction of the connecting pipe 44 is the same as the downward tilting rotation direction of the spiral protrusion 43.

[0013] The inline filter includes an inlet pipe 11 that communicates with the primary flow path chamber 39, and the inline filter is configured such that the cylindrical axis IC of the inlet pipe 11 is orthogonal to the cylindrical axis HC of the cylindrical wall 24, and when viewed from above the housing 9, the cylindrical axis IC of the inlet pipe 11 is located at a position offset from the cylindrical axis HC of the cylindrical wall 24.

[0014] An inlet 6 is provided in the cylinder wall 24 that separates the primary flow path chamber 39. At the inner corner between the cylinder wall 24 facing the inlet 6 and the top wall 25 that connects to the cylinder wall 24, a guide wall 42 is provided to guide the liquid in the primary flow path chamber 39 to the secondary flow path chamber 40.

[0015] [The effects of the invention]

[0016] In the inline filter of the present invention, the filter 10 is configured with its inlet 36 facing the through hole 38 formed between the primary flow path chamber 39 and the secondary flow path chamber 40 of the filter chamber 8, and the outlet 7 is opened on the cylinder wall 24 facing the lower half of the filter cylinder 33. Therefore, the liquid flowing into the primary flow path chamber 39 through the inlet 6 flows into the filter cylinder 33 of the filter 10 through the inlet 36, and flows downward through the filter cylinder 33 to reach the secondary flow path chamber 40, and then flows out from the outlet 7. More specifically, a portion of the liquid flowing into the filter 10 flows out through the filter cylinder 33 and flows downward at the same time, and finally flows from the lower half of the filter cylinder 33 facing the outlet 7 into the secondary flow path chamber 40. As described above, according to the present invention, a downward flow of liquid can be formed inside the filter cartridge 33 of the filter 10, thus suppressing the situation where solid foreign matter is filtered out only in a part of the filter cartridge 33, and solid foreign matter can be filtered out by using the entire filter cartridge 33 in the vertical direction. Therefore, according to the present invention, it is more reliable to prevent solid foreign matter from being concentrated and attached to only a part of the filter 10, and it is more reliable to prevent solid foreign matter from accumulating in that part.

[0017] When the cylinder axis SC of the filter 10 located in the filter chamber 8 coincides with the cylinder axis HC of the cylinder wall 24, the horizontal distance between the outer circumferential surface of the opposing filter cylinder 33 and the inner circumferential surface of the cylinder wall 24 is fixed around the filter 10 in the secondary flow path chamber 40 where the filtered liquid flows. Therefore, the flow resistance of the secondary flow path chamber 40 around the outer circumferential surface of the filter 10 is approximately uniform in the circumferential direction, allowing the liquid to flow more smoothly in the secondary flow path chamber 40. In addition, when a spiral protrusion 43 is provided on the inner circumferential surface of the cylinder wall 24 that separates the secondary flow path chamber 40, which is inclined downwards towards the bottom wall 26 in a spiral shape, the spiral protrusion 43 can be used to make the liquid passing through the filter cylinder 33 swirl around the cylinder axis HC of the cylinder wall 24, allowing the liquid to flow smoothly towards the outlet 7. In this way, by making the flow resistance around the outer side of the filter 10 approximately uniform and ensuring that the liquid flowing smoothly through the filter cartridge 33 towards the outlet 7, turbulence in the liquid flow within the secondary flow chamber 40 around the outer side of the filter 10 can be prevented, thereby reducing the pressure loss of the inline filter 1. Furthermore, since the liquid velocity and pressure vary depending on the size of the flow path, if the horizontal distance between the outer circumferential surface of the filter cartridge 33 and the inner circumferential surface of the cartridge wall 24 is different around the filter 10, the flow resistance will vary locally, causing turbulence in the liquid flow around the outer side of the filter 10.

[0018] The present invention includes a connecting pipe 44 that is formed to rotate and tilt upwards along the outer peripheral surface of the cylinder wall 24 from the outlet 7, and is configured such that, when viewed from above the outer casing 9, the upward tilting rotation direction of the connecting pipe 44 is the same as the downward tilting rotation direction of the spiral protrusion 43. Therefore, the rotation direction of the liquid swirling around the outside of the filter 10 via the spiral protrusion 43 is aligned with the rotation direction of the liquid flowing from the outlet 7 to the connecting pipe 44, thereby allowing the fluid to flow smoothly from the outlet 7 to the connecting pipe 44. Consequently, pressure loss caused by turbulent liquid flow in the connecting pipe 44 can be suppressed.

[0019] The present invention includes an inflow pipe 11 communicating with a primary flow path chamber 39, and is configured such that the cylindrical axis IC of the inflow pipe 11 is orthogonal to the cylindrical axis HC of the cylindrical wall 24, and when viewed from above the outer casing 9, the cylindrical axis IC of the inflow pipe 11 is positioned away from the cylindrical axis HC of the cylindrical wall 24. Therefore, the primary flow path chamber 39, with a cross-section orthogonal to the cylindrical axis HC of the cylindrical wall 24, is circular (see above, the primary flow path chamber 39 is circular (refer to above)). Figure 6 The liquid can flow in tangentially, thus causing the liquid flow within the primary flow chamber 39 to swirl around the cylinder axis HC of the cylinder wall 24. Furthermore, this flow is maintained as the liquid flows into the inner side of the filter 10 from the inlet 36. In summary, due to the swirling liquid flow within the filter 10, coupled with the downward flow of liquid inside the filter 10, the liquid passes through the entire vertical and circumferential directions of the filter cylinder 33, allowing solid impurities to be filtered out using the entire filter cylinder 33.

[0020] When an inlet 6 is provided in the cylinder wall 24 that separates the primary flow path chamber 39, and a guide wall 42 is provided at the inner corner between the cylinder wall 24 facing the inlet 6 and the top wall 25 continuing the cylinder wall 24, the liquid can flow smoothly from the primary flow path chamber 39 to the secondary flow path chamber 40. Furthermore, liquid tends to stagnate at the inner corner, and solid foreign objects may clump together there. However, by providing a guide wall 42 at the inner corner, liquid stagnation at the inner corner can be prevented, thus preventing the clumping of solid foreign objects. Additionally, when clumps of solid foreign objects reach the filter 10, abnormal noise may be generated due to contact between the foreign object clump and the filter cartridge 33, potentially causing damage to the filter cartridge 33. Attached Figure Description

[0021] Figure 1 This is a longitudinal cross-sectional front view of the main part of the inline filter according to an embodiment of the present invention.

[0022] Figure 2 for Figure 1A front view of a vertical filter.

[0023] Figure 3 for Figure 1 A top view of a vertical filter.

[0024] Figure 4 This is a longitudinal sectional front view of the outer shell.

[0025] Figure 5 for Figure 4 AA-line cross-section view.

[0026] Figure 6 for Figure 4 BB line cross-section.

[0027] Figure 7 This is an exploded front view of the internal structure.

[0028] Figure 8 This is a longitudinal sectional front view showing the connection between the cylinder wall and the top wall. Detailed Implementation

[0029] (Implementation Method)

[0030] Figures 1 to 8 This invention illustrates an embodiment of the inline filter. In this embodiment, the terms "front and back," "left and right," and "up and down" refer to... Figure 1 , Figure 3 and Figure 5 The crossed arrows are displayed, along with indications of their position relative to the surrounding area (front, back, left, right, up, down). For example... Figure 2 As shown, an in-line filter (hereinafter referred to as "filter") 1 is disposed between a first conveying pipe 2 on the upstream side and a second conveying pipe 3 on the downstream side extending in the left-right direction. It filters the liquid flowing through the piping system consisting of these conveying pipes 2 and 3, removing solid foreign matter and other contaminants contained in the liquid. The cylindrical axes of the first conveying pipe 2 and the second conveying pipe 3 are arranged coaxially.

[0031] like Figure 1 The filter 1 shown includes: a housing 9 having an inlet 6 for liquid inflow and an outlet 7 for liquid outflow, and having a filter chamber 8 internally connected to the inlet 6 and the outlet 7; a filter 10 disposed in the filter chamber 8 for filtering liquid flowing in from the inlet 6; an inlet pipe 11 disposed on the left side of the housing 9 and connected to the inlet 6; and an outlet pipe 12 disposed on the right side of the housing 9 and connected to the outlet 7, etc.

[0032] like Figure 2As shown, the inflow pipe 11 and the outflow pipe 12 extend horizontally in the left and right directions. The cylindrical axis IC of the inflow pipe 11 and the cylindrical axis OC of the outflow pipe 12 are arranged coaxially. Flanges 15 and 16 are respectively provided at the left end of the inflow pipe 11 and the right end of the first conveying pipe 2. After the flanges 15 and 16 of the inflow pipe 11 and the first conveying pipe 2 are aligned, the two flanges 15 and 16 are locked and fixed with a locking fitting 17 composed of bolts and nuts, thereby connecting the inflow pipe 11 and the first conveying pipe 2. Similarly, flanges 18 and 19 are respectively provided at the right end of the outflow pipe 12 and the left end of the second conveying pipe 3. After the flanges 18 and 19 of the outflow pipe 12 and the second conveying pipe 3 are aligned, the two flanges 18 and 19 are locked and fixed with a locking fitting 20 composed of bolts and nuts, thereby connecting the outflow pipe 12 and the second conveying pipe 3. Figure 2 Symbol 21 in the figure refers to the packing used to create a watertight seal between flanges 15 and 16 and between flanges 18 and 19.

[0033] like Figure 1 and Figure 4 As shown, the outer casing 9 includes: a hollow cylindrical wall 24 with its axis HC positioned vertically in the vertical direction; a top wall 25 sealing the opening at the upper end of the cylindrical wall 24; and a bottom wall 26 sealing the opening at the lower end of the cylindrical wall 24. The space enclosed by these walls 24, 25, and 26 serves as the filter chamber 8. Since the axis HC of the cylindrical wall 24 points vertically in the vertical direction, the axes IC and OC of the aforementioned inflow pipe 11 and outflow pipe 12 are orthogonal to the axis HC of the cylindrical wall 24. The top wall 25 serves as a cover for opening the upper end of the cylindrical wall 24 and can be attached and detached relative to the cylindrical wall 24. The upper end opening of the cylindrical wall 24 serves as an inlet / outlet 27 for entering the interior of the filter chamber 8. The inlet / outlet 27 can be closed by fixing the top wall 25 to the cylindrical wall 24 and can be opened by separating the top wall 25 from the cylindrical wall 24.

[0034] like Figure 2 and Figure 3 As shown, the top wall 25 of the cover, which forms the inlet / outlet 27, is secured to the cylinder wall 24 by locking bolts 29, which are made of hexagonal bolts, at its four corners to a roughly square-frame-shaped flange wall 28 that protrudes outward from the upper end of the cylinder wall 24. When the user needs to install or remove the filter 10 or inspect the inside of the filter chamber 8, the locking bolts 29 are loosened, allowing the top wall 25 to separate from the cylinder wall 24 and the inlet / outlet 27 to open, so that the user can reach into the filter chamber 8 from the upper side of the outer casing 9. After the installation or removal of the filter 10 or the inspection of the inside of the filter chamber 8 is completed, the user covers the inlet / outlet 27 with the top wall 25 and then locks the locking bolts 29 to close the filter chamber 8. Figure 1 In the middle, symbol 30 is a gasket used to create a watertight seal between the upper edge of the cylinder wall 24 and the top wall 25.

[0035] like Figure 1 As shown, the filter 10 includes: a filter cylinder 33 formed as a hollow cylinder with its axis SC arranged vertically in the vertical direction; a bottom cover 34 sealing the lower opening of the filter cylinder 33; and a retaining ring 35 provided at the upper end of the filter cylinder 33. The filter 10 is formed as a bottomed cylinder with an inlet 36 at the upper end for guiding liquid flowing from the inlet 6 into the filter chamber 8 into the filter cylinder 33. The filter cylinder 33 is made of stainless steel mesh with many micropores and is formed as a tapered cylinder that narrows downwards. The bottom cover 34 is formed as a shallow disc and is integrally fixed to the lower edge of the filter cylinder 33 in an externally fitted manner. The retaining ring 35 is used to fix the filter 10 relative to the filter chamber 8, and is formed as an annular ring and integrally fixed to the upper edge of the filter cylinder 33 in an externally fitted manner. The filter cylinder 33 maintains its shape by the retaining ring 35 and the bottom cover 34 fixed to its upper and lower ends.

[0036] The filter chamber 8 is divided into a primary flow path chamber 39 on the upper side for liquid flow before filtration, and a secondary flow path chamber 40 on the lower side for liquid flow before and after the filter cartridge 33, where the filter 10 is disposed. A circular mounting base 41 protrudes inward from the inner circumferential surface of the cylinder wall 24, slightly above the center in the vertical direction. The upper side above the mounting base 41 is the primary flow path chamber 39, and the lower side below the mounting base 41 is the secondary flow path chamber 40. The cylinder wall 24 separating the primary flow path chamber 39 is formed as a straight cylinder with the same outer circumferential dimensions in both the vertical and horizontal directions, while the cylinder wall 24 separating the secondary flow path chamber 40 is formed as a tapered cylinder that narrows downwards. Through holes 38 are formed between these primary flow path chambers 39 and secondary flow path chambers 40 to allow liquid flow; in this embodiment, the through hole 38 is located on the inner side of the mounting base 41.

[0037] The filter 10 is placed in the filter chamber 8 by falling into the secondary flow path chamber 40 through the through hole 38. At this time, the retaining ring 35 is blocked by the retaining seat 41, thereby restricting the downward movement limit of the filter 10. In this configuration, the inlet 36 of the filter 10 faces the through hole 38. Moreover, the cylinder axis SC of the filter 10 coincides with the cylinder axis HC of the cylinder wall 24. When the filter 10 and the cylinder wall 24 are configured such that the cylinder axis SC of the filter 10 coincides with the cylinder axis HC of the cylinder wall 24, the horizontal distance between the outer circumferential surface of the opposing filter cylinder 33 and the inner circumferential surface of the cylinder wall 24 is fixed around the filter 10 as the filtered liquid flows through the secondary flow path chamber 40.

[0038] like Figure 6As shown, the inlet 6 for fluid to flow into the filter chamber 8 is located on the cylindrical wall 24 facing the primary flow path chamber 39. Specifically, the inlet 6 is located at the center of the left rear circumference of the cylindrical wall 24 that separates the primary flow path chamber 39 in the vertical direction. The inlet pipe 11 extending in the horizontal direction communicates with the inlet 6, and when viewed from above the housing 9, the cylindrical axis IC of the inlet pipe 11 passing through the center of the inlet 6 is configured to be offset rearward from the cylindrical axis HC of the cylindrical wall 24.

[0039] When the cylinder axis IC of the inflow pipe 11 is thus positioned away from the cylinder axis HC of the cylinder wall 24, liquid can flow in tangentially into the primary flow chamber 39, which has a cross-section orthogonal to the cylinder axis HC of the cylinder wall 24. (Refer to...) Figure 6 Therefore, the liquid can be guided along the inner surface of the cylinder wall 24, causing a swirling flow around the cylinder axis HC of the cylinder wall 24 to be generated in the primary flow path chamber 39. The liquid thus forming a swirling flow in the primary flow path chamber 39 will maintain its flow (swirling flow) and flow from the inlet 36 into the filter cartridge 33. Therefore, a swirling flow can also be imparted to the liquid within the filter 10. In this embodiment, since the cylinder axis IC of the inlet pipe 11, configured to be located on the left rear side of the cylinder wall 24, passes through the rear side of the cylinder axis HC of the cylinder wall 24 (see reference...), Figure 6 Therefore, when viewed from above, the outer casing 9 produces a flow that swirls clockwise (right-handed) within the primary flow chamber 39.

[0040] like Figure 8 As shown, a guide wall 42 is provided at the inner corner between the cylinder wall 24 facing the inlet 6 and the top wall 25 continuing the cylinder wall 24, guiding the liquid in the primary flow chamber 39 towards the secondary flow chamber 40 (lower side). The guide wall 42 is provided on the lower surface of the top wall 25 continuing on the cylinder wall 24 facing the inlet 6. In this embodiment, it is formed on the lower surface of the right half of the top wall 25. The guide wall 42 is formed in a semi-cylindrical shape protruding downwards, and its inner circumferential surface is formed in a quarter-circular arc shape. The liquid flowing into the primary flow chamber 39 is guided downwards on the inner circumferential surface of the guide wall 42, thereby increasing the flow potential towards the secondary flow chamber 40.

[0041] like Figure 4 and Figure 5As shown, a spiral protrusion 43 is formed on the inner circumferential surface of the cylinder wall 24 that separates the secondary flow path chamber 40, spiraling downward toward the bottom wall 26. The spiral protrusion 43 is a flat, downward-sloping, extended protrusion protruding toward the cylinder axis HC of the cylinder wall 24. When viewed from above, the spiral protrusion 43 is formed in a spiral shape that slopes downward toward the bottom wall 26 as it moves clockwise (right-handed). The formation of the spiral protrusion 43 on the cylinder wall 24 allows the liquid to be guided by the concave surfaces formed between adjacent spiral protrusions 43 in the vertical direction, thereby maintaining or enhancing the flow potential of the swirling flow generated in the primary flow path chamber 39.

[0042] The outlet 7, from which liquid flows out of the filter chamber 8, is located on the cylinder wall 24 facing the lower half of the filter cylinder 33. Specifically, the outlet 7 extends from the lower end of the cylinder wall 24, which separates the secondary flow path chamber 40, to a position slightly above the center in the vertical direction of the secondary flow path chamber 40. Furthermore, the outlet 7 faces downward from the central portion of the filter 10 located in the filter chamber 8.

[0043] Figure 3 and Figure 4 In the diagram, symbol 44 represents a connecting pipe 44, one end of which is connected to the outlet 7 and the other end of which is connected to the outlet pipe 12. The connecting pipe 44 bulges out from the outer peripheral surface of the rear half of the cylinder wall 24 and is formed to rotate clockwise (right-handed) along the outer peripheral surface of the cylinder wall 24 from the outlet 7 and then tilt upwards to the outlet pipe 12. When viewed from above the outer casing 9, the upward tilting rotation direction of the connecting pipe 44 is set to the same rotation direction as the downward tilting rotation direction of the spiral protrusion 43. The end of the connecting pipe 44 on the outlet pipe 12 side is connected to the lower surface of the base end of the outlet pipe 12.

[0044] The filter 10 installed in the filter chamber 8 is made removable by means of a filter retaining structure. Figure 1 In this filter, the retaining structure consists of: a pressure plate 47 that cooperates with the fixing seat 41 to clamp the fixing ring 35 in the vertical direction; a pressing spring 48 consisting of a torsion coil spring that presses the pressure plate 47 against the fixing seat 41; a first boss 49 located on the lower surface of the bottom cover 34 of the filter 10; and a second boss 50 located on the upper surface of the bottom wall 26 of the cylinder wall 24 and fitted inside and outside the first boss 49. The first boss 49 is formed into a cylindrical shape, and the second boss 50 is formed into a cylindrical shape for the first boss 49 to be fitted inside. The fit of the two bosses 49 and 50 restricts the positional displacement of the bottom cover 34 relative to the cylinder wall 24 in the front-back and left-right directions.

[0045] like Figure 7As shown, the pressure plate 47 includes: an inner ring 51 that blocks the pressing spring 48, an outer ring 52 that contacts the fixing ring 35, and a plurality of brackets 53 arranged radially to connect the inner and outer rings 51 and 52. The inner and outer rings 51 and 52 are composed of concentric ring bodies, and the pressure plate 47 has a plurality of through-holes 54, each of which is surrounded by two rings 51 and 52 and two adjacent brackets 53. Liquid in the primary flow chamber 39 enters the interior of the filter cartridge 33 through the inlet 36 via the through-holes 54.

[0046] The pressing spring 48 and the hollow cylindrical top shaft 55 disposed on the upper side of the pressing spring 48 are together located between the lower surface of the top wall 25 and the upper surface of the inner ring 51. Figure 1 As shown, the upper end of the top shaft 55 is blocked by the top wall 25, and the spring force of the pressing spring 48 acts on the fixing ring 35 through the pressure plate 47. Under the action of the aforementioned spring force, the fixing ring 35 is clamped in the vertical direction by the fixing seat 41 and the outer ring 52, restricting the vertical displacement of the filter 10 relative to the cylinder wall 24. Therefore, the filter 10 is set in the secondary flow path chamber 40 of the filter chamber 8 in a state where its front-back and left-right positions are maintained by the inner and outer fitting first and second protrusions 49 and 50, and its vertical position is maintained by the fixing seat 41 and the outer ring 52 clamping the fixing ring 35.

[0047] Inside the filter 10, a cleaning brush 58 is provided to remove filter residue adhering to the inner surface of the filter cartridge 33. For example... Figure 7 As shown, the cleaning brush 58 includes a brush shaft 59 extending in the same direction as the cylinder axis SC of the filter 10, and three (or more) rows of bristle tufts 60 disposed on the outer peripheral surface of the brush shaft 59 for contacting the inner surface of the filter cylinder 33. Each bristle tuft 60 is composed of multiple bundles of unit bristles 61 arranged in a vertical direction. Moreover, each bristle tuft 60 is arranged in a spiral shape, that is, when the cleaning brush 58 is viewed from above, the front end of the unit bristle tuft 61 is offset around the brush shaft 59 as it moves downward. In this embodiment, each bristle tuft 60 is configured in a spiral shape such that the front end of the unit bristle tuft 61 rotates clockwise (right-handed) as it moves downward.

[0048] The swirling direction of the liquid in the primary flow chamber 39 is preferably the same as the swirling direction of the liquid around the outside of the filter 10 generated by the swirling protrusion 43. This is because if the swirling direction of the liquid is different, the flow will be turbulent, and the pressure loss of the filter 1 will increase. In addition, as in this embodiment, when the rotation direction of the spirally arranged unit bristles 61 is set to be the same as the swirling direction of the liquid under the action of the swirling protrusion 43, the liquid can flow along each bristle row 60, thus effectively preventing the reduction of the flow potential of the liquid in the secondary flow chamber 40.

[0049] The cleaning brush 58 can be operated via a handle 62 located on the upper exterior of the housing 9. The handle 62 consists of a handle shaft 63 coaxially mounted on the upper end of the brush shaft 59 and extending upwards to the exterior of the housing 9, and an operating handle 64 located at the upper end of the handle shaft 63. The handle shaft 63 is composed of a shaft with a diameter smaller than that of the brush shaft 59, and... Figure 1 As shown, it is connected to the outside of the outer casing 9 via the inner hole of the inner ring 51, the inner side of the pressing spring 48, the inside of the top shaft 55, and the shaft hole 65 formed vertically in the top wall 25.

[0050] The handle shaft 63 is supported so that it can rotate relative to the top wall 25 but cannot move up and down. Specifically, an annular retaining groove 66 is formed in the portion of the top wall 25 where the handle shaft 63 is recessed. A pair of semi-circular collars 67 are inserted into the retaining groove 66 to clamp the handle shaft 63, thus supporting the handle shaft 63 so that it can rotate relative to the top wall 25 but cannot move up and down. The pair of collars 67 are fixed by collar clamping plates 69, which are fixed to the upper surface of the top wall 25 by fixing bolts 68. The operating handle 64 has a pair of rods extending in opposite directions, with the handle shaft 63 located between the pair of rods, and the operating handle 64 can be attached to and detached relative to the handle shaft 63. Figure 8 In the diagram, symbol 70 is a fixing screw used to fix the operating handle 64 to the handle shaft 63, and symbol 71 is a sealing ring that seals the gap between the handle shaft 63 and the shaft hole 65.

[0051] The filter 1 includes a drain line 73 for discharging filter residue, along with liquid, from the cleaning brush 58 to the outside of the housing 9. The drain line 73 consists of an upper drain passage 74 and a lower drain passage 75 connected vertically, and is formed from the inside of the filter 10 to the lower outside of the housing 9. At the end of the drain line 73, that is, at the downstream end of the lower drain passage 75, a drain valve 76 is provided to control the operation of the drain line 73.

[0052] The upper discharge passage 74 is formed by a through hole extending from the upper surface of the bottom cover 34 to the lower surface of the first protrusion 49. Similarly, the lower discharge passage 75 is formed by a through hole extending from the upper surface of the second protrusion 50 to the lower surface of the valve protrusion 77, which protrudes from the lower surface of the bottom wall 26. The inner surface of the lower discharge passage 75 in the valve protrusion 77 portion is formed with an internal thread. The upper discharge passage 74 and the lower discharge passage 75 constituting the discharge line 73 are connected by the engagement of the first protrusion 49 and the second protrusion 50. In this embodiment, because the upper discharge passage 74 is formed in the bottom cover 34, the bottom cover 34, the first and second protrusions 49 and 50, the bottom wall 26, and the discharge valve 76 together seal the lower opening of the filter cartridge 33. Alternatively, in a filter 1 without a discharge line 73, the lower opening of the filter cartridge 33 can be sealed solely by the bottom cover 34.

[0053] The discharge valve 76 is locked in place from below by the valve seat 77, and the internal valve body can be operated by manually turning the handle 78. Figure 2 As shown, when the handle 78 is in a horizontal position, the valve body of the discharge valve 76 is in a closed position, closing the flow path within the discharge valve 76. By rotating the handle 78 downwards from this horizontal position, the valve body of the discharge valve 76 can be operated to the open position, opening the flow path within the discharge valve 76. When the handle 78 is rotated 90 degrees from the horizontal position to a vertical position, the valve body of the discharge valve 76 becomes fully open.

[0054] The liquid flows within the filter 1 in the following manner, removing solid impurities. Liquid flowing through the piping and then through the inlet pipe 11 into the primary flow chamber 39 of the filter chamber 8 from the inlet 6, swirls around the cylinder axis HC of the cylinder wall 24 within the primary flow chamber 39, and flows downwards into the secondary flow chamber 40 under the guidance of the guide wall 42, reaching the inlet 36 of the filter 10. Maintaining its swirling flow, the liquid flows from the inlet 36 of the filter 10 into the filter cartridge 33, flowing towards the outlet 7, i.e., downwards through the secondary flow chamber 40, while passing through the filter cartridge 33 under the centrifugal force of its flow, thus filtering out solid impurities. The filtered liquid flowing around the outside of the filter 10 maintains or enhances its swirling flow due to the swirling protrusions 43, flowing towards the outlet 7. The liquid flowing to outlet 7 will flow through connecting pipe 44 to outlet pipe 12, and then flow again in the piping line.

[0055] The piping system, including filter 1, requires regular inspection and cleaning of all its components. This regular inspection and cleaning necessitates stopping the operation of the piping system; therefore, filter 1 can be disassembled for cleaning. Disassembly of filter 1 involves loosening the locking bolts 29 to release the top wall 25 from the cylinder wall 24. At this time, in addition to the handle 62 supported on the top wall 25, the cleaning brush 58, the pressure plate 47 with the handle shaft 63 inserted, the pressing spring 48, and the top shaft 55 are all removed from the housing 9. Furthermore, by removing the pressure plate 47 from the housing 9, the filter 10, now freed from its clamping position, can be removed from the housing 9.

[0056] The components integrated with the top wall 25 can be disassembled into the following parts: the operating handle 64 can be separated from the handle shaft 63 by loosening the fixing screw 70, and the retaining ring pressure plate 69 and retaining ring 67 can be separated from the top wall 25 by loosening the fixing bolt 68. This allows disassembly into the top wall 25, the handle shaft 63 connected to the cleaning brush 58, the operating handle 64, the pressure plate 47, the pressing spring 48, and the top shaft 55. After cleaning the disassembled components, they are reassembled relative to the outer casing 9 in the reverse order to complete the disassembly and cleaning process.

[0057] The filter 1 of this embodiment, equipped with a discharge line 73, allows for easy cleaning of the filter 10 even during normal equipment operation. First, slowly turn the horizontal handle 78 downwards to open the valve body of the discharge valve 76. As liquid begins to drain from the discharge valve 76, rotate the operating handle 64 around the handle shaft 63 to brush away solid foreign matter adhering to the inner surface of the filter cartridge 33 using the cleaning brush 58. The brushed-off filter residue is discharged along with the liquid through the discharge line 73 to the outside of the housing 9. Once no filter residue is visible in the discharged liquid, the simple cleaning of the filter 10 is complete. Then, turn the handle 78 to a horizontal position to close the discharge line 73 and end the cleaning of the filter 10. At this time, a bucket or similar container can be placed below the discharge valve 76 to catch the liquid containing solid foreign matter discharged from the discharge line 73.

[0058] As described above, in the filter 1 of this embodiment, the filter 10 is positioned with its inlet 36 facing the through hole 38 formed between the primary flow path chamber 39 and the secondary flow path chamber 40 in the filter chamber 8, and the outlet 7 is opened on the cylinder wall 24 facing the lower half of the filter cylinder 33. Therefore, a downward flow of liquid can be formed inside the filter 10. In this way, when a downward flow of liquid can be formed inside the filter 10, the situation where solid foreign matter is filtered out only in a part of the filter cylinder 33 can be suppressed. Instead, solid foreign matter can be filtered out by filtering out the entire filter cylinder 33 in the vertical direction. Therefore, it is more reliable to prevent solid foreign matter from being concentrated and attached to only a part of the filter cylinder 33, and to avoid the accumulation of solid foreign matter in that part. This also prevents premature blockage of the filter cylinder 33 due to filter residue. In summary, the filter 1 according to this embodiment can prevent premature blockage of the filter cartridge 33, thus extending the cleaning cycle and suppressing the reduction in maintenance time and labor and the equipment operating rate of the piping.

[0059] Because the cylinder axis SC of the filter 10 located in the filter chamber 8 is arranged to coincide with the cylinder axis HC of the cylinder wall 24, the horizontal distance between the outer circumferential surface of the opposing filter cylinder 33 and the inner circumferential surface of the cylinder wall 24 is fixed around the filter 10 in the secondary flow path chamber 40 where the filtered liquid flows. Therefore, the flow resistance of the secondary flow path chamber 40 around the outer circumferential surface of the filter 10 is approximately uniform in the circumferential direction. In addition, because a spiral protrusion 43 is provided on the inner circumferential surface of the cylinder wall 24 that separates the secondary flow path chamber 40, it can be used to make the liquid passing through the filter cylinder 33 swirl around the cylinder axis HC of the cylinder wall 24, so that the liquid flows smoothly towards the outlet 7. As described above, when the flow resistance around the outside of the filter 10 is made approximately uniform and the liquid passing through the filter cartridge 33 flows smoothly toward the outlet 7, the flow of the liquid in the secondary flow chamber 40 around the outside of the filter 10 can be prevented from becoming turbulent, thereby reducing the pressure loss of the inline filter 1.

[0060] The present invention is configured such that the outlet 7 and the outlet pipe 12 are connected via a connecting pipe 44. The connecting pipe 44 is configured to rotate and tilt upwards along the outer circumferential surface of the cylinder wall 24 from the outlet 7 to the outlet pipe 12. When viewed from above, the upward rotation direction of the connecting pipe 44 is the same as the downward rotation direction of the spiral protrusion 43. Based on this, the rotation direction of the liquid swirling around the outside of the filter 10 via the spiral protrusion 43 is aligned with the rotation direction of the connecting pipe 44 from the outlet 7 to the outlet pipe 12, thus allowing the fluid to flow smoothly from the outlet 7 to the outlet pipe 12 via the connecting pipe 44. Therefore, pressure loss caused by turbulent liquid flow in the connecting pipe 44 can be suppressed.

[0061] The present invention includes an inflow pipe 11 communicating with a primary flow path chamber 39, and is configured such that the cylindrical axis IC of the inflow pipe 11 is orthogonal to the cylindrical axis HC of the cylindrical wall 24, and when viewed from above the outer casing 9, the cylindrical axis IC of the inflow pipe 11 is positioned away from the cylindrical axis HC of the cylindrical wall 24. Therefore, the primary flow path chamber 39, with a cross-section orthogonal to the cylindrical axis HC of the cylindrical wall 24, is circular (see above, the primary flow path chamber 39 is circular (refer to above)). Figure 6 The liquid can flow in tangentially, thus causing the liquid flow within the primary flow chamber 39 to swirl around the cylinder axis HC of the cylinder wall 24. Furthermore, this flow is maintained as the liquid flows into the inner side of the filter 10 from the inlet 36. In summary, due to the swirling liquid flow within the filter 10, coupled with the downward flow of liquid inside the filter 10, the liquid passes through the entire vertical and circumferential directions of the filter cylinder 33, allowing solid impurities to be filtered out using the entire filter cylinder 33.

[0062] Since an inlet 6 is provided in the cylinder wall 24 that separates the primary flow path chamber 39, and a guide wall 42 is provided at the inner corner between the cylinder wall 24 facing the inlet 6 and the top wall 25 continuing the cylinder wall 24, the liquid in the primary flow path chamber 39 can be smoothly guided to the secondary flow path chamber 40. Furthermore, liquid tends to stagnate at the inner corner, and solid foreign objects may clump together there. However, by providing the guide wall 42 at the inner corner, liquid stagnation at the inner corner can be prevented, thus preventing the clumping of solid foreign objects. Additionally, when clumps of solid foreign objects reach the filter 10, abnormal noise may be generated due to contact between the foreign object clump and the filter cartridge 33, which may also cause damage to the filter cartridge 33.

[0063] Inside the filter 10, a cleaning brush 58 is provided, operated by a handle 62 located outside the housing 9, to brush away filter residue adhering to the inner surface of the filter cartridge 33. A discharge line 73 extending from the primary side of the filter 10 to the outside of the housing 9 is also provided, along with a discharge valve 76 for switching the discharge line 73 on and off. Therefore, filter residue adhering to the inner surface of the filter cartridge 33 can be discharged to the outside of the filter 10 without stopping the pipeline. Thus, the filter 10 can be cleaned without removing it from the housing 9.

[0064] In the above embodiments, although the filter cylinder 33 of the filter 10 is formed as a tapered cylinder that narrows downwards, the filter cylinder 33 can also be formed as a straight cylinder that expands downwards into a tapered cylinder.

[0065] Explanation of reference numerals in the attached figures

[0066] 1. In-line filter

[0067] 6. Inlet

[0068] 7. Outlet

[0069] 8 Filter Chamber

[0070] 9. Outer shell

[0071] 10 Filters

[0072] 11 Inflow pipe

[0073] 12 Outflow tubes

[0074] 24. Cylinder wall

[0075] 25 Top Wall

[0076] 26 bottom wall

[0077] 33 Filter Cartridge

[0078] 34 Bottom Cover

[0079] 36 Inlet Port

[0080] 38 through holes

[0081] 39 Primary flow path chamber

[0082] 40 Secondary flow path chamber

[0083] 42 Guide Wall

[0084] 43. Circular protrusion

[0085] 44 Connecting pipe

[0086] HC housing cylinder shaft

[0087] IC inflow tube cylinder core

[0088] The cylindrical shaft of the SC filter.

Claims

1. An inline filter, comprising: The housing (9) has an inlet (6) for liquid to flow in, an outlet (7) for filtered liquid to flow out, and a filter chamber (8) connected from the inlet (6) to the outlet (7); and A filter (10), installed inside the filter chamber (8), filters the liquid flowing in from the inlet (6). The outer shell (9) includes: a cylindrical wall (24) formed in a hollow cylindrical shape and extending in the vertical direction, and a top wall (25) sealing the upper end of the cylindrical wall (24). The filter chamber (8) is divided into a primary flow path chamber (39) formed on the upper side and connected to the inlet (6), and a secondary flow path chamber (40) formed on the lower side and connected to the outlet (7), and a through hole (38) is provided between the two chambers (39, 40). The filter (10) comprises: a filter cylinder (33) having openings at both ends and being formed as a hollow cylindrical shape that is elongated in the vertical direction; a bottom cover (34) that seals the lower opening of the filter cylinder (33); and an inlet (36) that allows liquid to enter is formed at the upper end of the filter cylinder (33). The filter (10) is positioned inside the filter chamber (8) with its inlet (36) facing the through hole (38). The outlet (7) is located on the cylinder wall (24) facing the lower half of the filter cylinder (33). When the extension direction of the cylinder wall (24) is defined as the cylinder axis (HC) and the extension direction of the filter cylinder (33) is defined as the cylinder axis (SC), the two axes (HC, SC) coincide. On the inner circumferential surface of the cylinder wall (24) that separates the secondary flow path chamber (40), there is a spirally inclined downward spiral protrusion (43). It has a connecting pipe (44) that is formed to rotate and tilt upward along the outer circumferential surface of the cylinder wall (24) from the outlet (7). Furthermore, the inline filter is configured such that when viewed from above, the upward rotation direction of the connecting pipe (44) is the same as the downward rotation direction of the spiral protrusion (43).

2. The in-line filter according to claim 1, comprising: an inflow pipe (11) communicating with the primary flow path chamber (39), Furthermore, the inline filter is configured such that the cylinder axis (IC) of the inlet pipe (11) is orthogonal to the cylinder axis (HC) of the cylinder wall (24), and when viewed from above the housing (9), the cylinder axis (IC) of the inlet pipe (11) is located away from the cylinder axis (HC) of the cylinder wall (24).

3. The inline filter according to claim 1, wherein, An inlet (6) is provided in the cylinder wall (24) of the partitioned primary flow path chamber (39). At the inner corner between the cylinder wall (24) facing the inlet (6) and the top wall (25) that connects to the cylinder wall (24), a guide wall (42) is provided to guide the liquid in the primary flow path chamber (39) to the secondary flow path chamber (40).

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