FILTER PULSE DAMPING DEVICE

Abstract

A replaceable filter element includes an annular filter medium defining a central passage, a central tube disposed in the central passage of the annular filter medium defining a central reservoir, an upper open end attached to the central tube, the upper open end including an opening allowing fluid to flow from the central reservoir to the outside of the filter element, a lower open end attached to the central tube opposite the upper open end, and a filter pulsation dampening device including a filter element baffle extending longitudinally upward from the filter element.

Description

FILTER PULSE DAMPING DEVICE FIELD OF INVENTION This description generally refers to tank-style filter systems that employ a replaceable filter element. More specifically, this description refers to a filter element that includes a positioning and sealing feature for axially and radially positioning the filter element in a desired location while providing a seal that helps ensure that the dirty fluid is filtered through the filter element's filtration medium. BACKGROUND OF THE INVENTION Liquid filter systems are known for filtering various fluids such as gas, oil, diesel fuel, etc., to remove contaminants. In some cases, the filter is in direct contact with pumps, motors, or other similar devices that can create pressure pulses in the fluid being filtered, which can reach the filter. Pressure pulses have been shown to reduce filter effectiveness during use, depending on the operating environment. United States Patent No. 8,479,712 describes a pulsation-reducing apparatus that includes a piston that is displaced in a valve chamber due to an increase in r Lcicnn / zznz / E / YiAi Ref. 334151 describes a fuel pressure surge in an upstream fuel passage caused by a pressure pulse. Fluid communication between the valve chamber and a downstream fuel passage is blocked, while fluid communication between the valve chamber and a return passage is unblocked, allowing a bypass flow of fluid. The pressure pulse is thus conducted into the return passage and dampened by a pulsation-reduction mechanism, including a plurality of fluid restriction orifices. The fuel, once it has passed through the orifices, is returned to the upstream fuel passage via the return passage. As can be seen, patent '712 requires an additional mechanism outside the filter to provide protection against pressure pulses. This additional mechanism increases the overall cost of the system and may require maintenance. Therefore, it is desirable to develop a pressure pulse protection mechanism that is less complicated, less expensive, and easier to maintain. BRIEF DESCRIPTION OF THE INVENTION A replaceable filter element is provided that includes at least one partially cylindrical configuration and defines a longitudinal axis and a radial direction according to one embodiment of the present description. The filter element may comprise an annular filter medium r Lacnn / zznz / E / YiAi that defines a central passage, a central tube disposed in the central passage of the annular filter medium that defines a central reservoir, and the annular filter medium surrounding the central tube and the central reservoir, an upper open end attached to the central tube disposed along the longitudinal axis, the upper open end including an opening that allows fluid to flow from the central reservoir to the outside of the filter element, and a lower open end attached to the central tube opposite the upper open end disposed along the longitudinal axis.A filter pulsation dampening device may be provided that includes a filter element baffle extending longitudinally upwards from the upper open end or from the center tube of the filter element. A cover bolt is provided for use with a filter element to provide a filter pulse damping device according to one embodiment of the present description. The cover bolt may comprise at least partially cylindrical body defining a cylindrical axis and a radial direction, and may include a head defining a head diameter, a shaft portion extending axially from the head, the shaft portion defining a shaft portion diameter that is smaller than the head diameter, forming a bearing surface configured to contact a portion of the filter element, and a first baffle extending from the baffle portion, the first baffle extending axially away from the head and radially away from the shaft portion. A pulse-damping interface is provided between a filter and a filter base that is configured to mitigate pulses according to a modality of the present description. The interface may comprise a filter element that includes at least partially a cylindrical configuration and defines a longitudinal axis and a radial direction.The filter element may further comprise an annular filter medium defining a central passage, a central tube disposed within the central passage of the annular filter medium defining a central reservoir, the annular filter medium surrounding the central tube and the central reservoir, an upper open end attached to the central tube arranged along the longitudinal axis, the upper open end including an opening allowing fluid to flow from the central reservoir to the outside of the filter element, and a lower open end attached to the central tube opposite the upper open end arranged along the longitudinal axis. Additionally, a cover bolt and base interconnecting with the filter element may be provided.A filter pulsation damping device r Lacnn / zznz / E / YiAi that is operatively associated with the base and filter element may include a first damper extending from the cover bolt, and a second baffle extending from the base or filter element that is arranged close to the first baffle, defining a flow passage with a minimum distance between the first baffle and the second baffle. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a front cross-sectional view of a filter assembly showing a filtration pulse damping device using small passages and baffles to prevent pressure pulses from reaching the filter element according to one embodiment of the present description. FIG. 2 is an enlarged detailed view of the filtration pulsation damping device of the filter assembly in FIG. 1. FIG. 3 is a front cross-sectional view of a filter assembly showing a filtration pulse damping device using a rubber valve to prevent pressure pulses from reaching the filter element according to another embodiment of the present description. FIG. 4 is an enlarged detailed view of the filtration pulsation damping device of the filter assembly in FIG. 3. r Lcicnn / zznz / E / YiAi DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the various features described, examples of which are illustrated in the accompanying figures. Wherever possible, the same reference numbers will be used in all figures to refer to identical or similar parts. In some cases, a reference number will be indicated in this description, and the figures will show the reference number followed by a letter, for example, 100a, 100b, or a prime indicator such as 100', 100'', etc. It should be understood that the use of letters or primes immediately following a reference number indicates that these features have a similar form and function, as is often the case when geometry is mirrored around a plane of symmetry.For the sake of ease of explanation in this description, letters or primes will often not be included herein, but may be shown in the figures to indicate duplicates of features described within this written description. First, a filter system will now be described to provide the reader with the appropriate context for understanding how the various modalities of this description are used. It should be understood that this description is provided as an example and is not in any way limiting. Any modality of an apparatus or method described herein may be used in conjunction with any filter system. r Lacnn / zznz / E / YiAi A filter element will then be described, which may include a pulsation damping device according to various configurations. The device may include an assembly of baffles, deflectors, and / or valves, etc., that are attached to various components of the filter element, such as the center tube, the top end cap, the base, etc. Figures 1 to 4 illustrate a 100, 100' reservoir filter system that can use a 200, 200' filter element according to various embodiments of the present description. This system may also be referred to as a pulse-damping interface between a filter and a filter base that is configured to mitigate pulses. Beginning with Figures 1 and 3, the tank filter system 100, 100' may include a base 102, a tank 104, and a filter element 200, 200'. The tank filter system 100 can be used to filter fluids such as diesel or gasoline or other liquid fuels, lubricating oil, hydraulic fluid for hydraulic power systems, transmission fluid, or even possibly intake air for an engine. The tank filter system 100 can also be used as a fuel / water separator filter. The tank filter system 100 with the features described herein could be adapted by a person skilled in the art for many different purposes and suited to many other applications. r Lcicnn / zznz / E / YiAi Base 102 includes an inlet channel 106 for fluid to enter the reservoir filter system 100, and an outlet channel 108 for fluid to exit the reservoir filter system 100. Base 102 also includes base threads 110. A joining structure other than threads may be used. The tank 104 includes an upper open end 112 and a lower closed end 114. Adjacent to the upper open end 112 are bolt threads 116 that can engage with base threads 110 to fasten the tank 104 to the base 102. The threads are an example of mating structures that can be included in the base 102 and bolt 300, 300' to form a releaseable coupling. Other mating structures may be used, as will be recognized by those skilled in the art. The filter element 200, 200' can take different forms to suit a particular application. In the illustrated embodiment, the filter element 200, 200' is well-suited for filtering fuel or lubricating oil. The filter element 200, 200' may include an annular filter medium 202 circumferentially surrounding a central reservoir 204 defined by a central tube 206. Axial ends of the annular filter medium 202 to be sealed by end caps are shown. A top end cap 208 can define an axial open end of the filter element 200. The top end cap 208 is called open because it includes an opening 210 to allow fluid passage to the outlet channel 108 of the central reservoir 204 defined by the central tube 206. On the other hand, the lower end cap 212 defines an axially closed end of the filter element 200. The lower end cap 212 is called closed because it prevents any fluid outside the filter element 200 adjacent to the axial end of the annular filter medium 202 from flowing unfiltered into the center tube 206. The lower end cap 212 can be closed by engaging with a cover bolt 300, 300' which in turn engages with the center tube 206. This may not be the case for other embodiments of the present description. The upper end cap 208 and the lower end cap 212 can each be attached to the center tube 206 by welding, adhesives, etc. Alternatively, several or all of the center tubes 206, the upper end cap 208, and the lower end cap 212 can be constructed as unitary components. Other configurations are possible. During operation, the fluid to be filtered enters from the inlet channel 106 and flows into the annular cavity 118 between the reservoir 104 and the annular filter medium 202. The fluid then passes into and through the filter medium 202, then into the central tube 206 through perforations 214 r Lcicnn / zznz / E / YiAi shown therein in FIGS. 1 and 2. The fluid then exits the central tube 206 through the upper end cap 208 and the opening 210 into the outlet channel 108. The sealed construction at the bottom of the filter element 200, 200' helps define the fluid channels to and from the annular filter medium 202, preventing any fluid from flowing directly into the outlet channel 108 and bypassing the annular filter medium 202. For the same purpose, baffles, baffles, and valves, etc., may be provided at the top of the tank filter system 100, 100', which will be described in detail later herein, preventing a similar seal and potentially providing a pulsation damping device according to various modalities of this description. Referring now to FIGS. 1 and 2, a 100 tank filter system will now be described in accordance with various embodiments of the present description that provides a pulsation damping device. The reservoir filter system 100 may comprise a filter element 200 that includes at least partially a cylindrical configuration and defines a longitudinal axis 216 and a radial direction 218. The filter element 200 may comprise an annular filter medium 202 that defines a central passage 219 and a central tube 206 that are arranged in the central passage 219 of the annular filter medium 220 that defines a central reservoir 204. Therefore, the annular filter medium 202 surrounds the central tube 206 and the central reservoir 204. As best seen in FIG. 1, the filter element 200 may further include an upper open end 220 attached to the central tube 206 arranged along the longitudinal axis 216. The upper open end 220 includes an opening 210 that allows fluid to flow from the central reservoir 204 to the outside of the filter element 200. Similarly, referring again to FIG. 1, the filter element 200 may include a lower open end 222 attached to the central tube 206 opposite the upper open end 220 which is also arranged along the longitudinal axis 216. Therefore, the lower open end 222 allows the insertion of the cover bolt 300. The tank filter system 100 may also include a tank 104 comprising an upper open end 112 (see FIG. 1), and a lower closed end 114 with respect to the longitudinal axis 216 (as previously described herein, see FIGS. 1 and 3), and a cover bolt 300 that may penetrate through the lower closed end 114 of the tank 104 (providing one or more seals) or side into the top of the lower closed end 114 as shown in FIGS. 1 and 3. This may be referred to as a stud-style bolt that rests on the lower closed end of the tank so that its shoulder portion or its head is trapped between the filter element and the tank, etc. Looking at FIGS. 1 and 2, a pulsation dampening device 224 may include a first baffle 226 extending from the cover bolt 300, and a second baffle 228 extending from the base 102 or the filter element 200 disposed close to the first baffle 226, defining a flow passage 230 with a minimum distance 232 between the first baffle 226 and the second baffle 228. In certain embodiments of the present description, the minimum distance 232 varies from 0.1 mm to 5.0 mm. As a result of the present construction, one or more pressure pulses 120 downstream of the annular filter medium 202 can be greatly reduced before reaching the annular filter medium 202. This, in turn, can reduce any degradation of the filter element 200's performance, such as its output to a motor or other downstream device. The minimum distance 232 can be varied to achieve the desired effect and may differ from the interval just mentioned in other embodiments of the present description. As will be described momentarily, the configurations of the first baffle 226 and the second baffle 228 can be reversed in other embodiments of the present description. As shown in FIGS. 1 and 2, the first deflector r Lacnn / zznz / E / YiAi 226 can extend radially outwards and longitudinally upwards from the cover bolt 300 past the upper open end 220 (e.g., the upper terminal cap 208) of the filter element 200. The second baffle 228 can be attached to the base 102 and extends longitudinally downwards and radially inwards from the base 102 past the upper open end 220 (e.g., the upper terminal cap 208) of the filter element 200. The second baffle 228 may define an S-shaped portion 234. A third baffle 236 may extend purely longitudinally from the S-shaped portion 234 of the second baffle 228 to the upper open end 220 (for example, the upper end cap 208) or to the center tube 206, forming a downward-facing V-shaped region 239 with the second baffle 228. The first baffle 226 may be disposed between the second baffle 228 and the third baffle 236, defining a serpentine flow passage 230 (which may or may not have a consistent minimum distance 232). Other configurations are possible in other embodiments. For example, the second baffle may have other configurations such as a straight shape, etc. In some embodiments of the present description, as shown in FIG.1. The second deflector 228 is attached to the base 102, the first deflector 226 is attached to the cover bolt 300, and the third deflector 236 is attached to the filter element 200 (the third deflector 236 can be attached to the upper open end 220 (e.g., the upper end cap 208) or to the center tube 206, etc.). During assembly, the cover bolt 300 can be attached to the tank 104 and the filter element 200, forming a sub-assembly. Next, the reservoir 104, the filter element 200, and the cover bolt 300 are attached to the base 102. The third baffle 236 then comes into contact with the second baffle 228, forming a seal between them, and the second baffle 228 fits between the first baffle 226 and the second baffle 228 to form the serpentine flow passage. In other embodiments, the second deflector 228 and the third deflector 236 may be unitary and may be attached to the filter element 200 so that these deflectors come into contact with the base 102. Other variations are possible. The first baffle 226, the second baffle 228, and the third baffle 236 may all comprise a thermoplastic material (e.g., polyurethane, nylon, etc.). Other materials, such as metal, may be used in other embodiments, and the materials of different baffles may differ from each other, etc. The first baffle 226, the second baffle 228, and the third baffle 236 may all have the same thickness 238 (minimum dimension), which varies from 0.1 mm to 45.0 mm in certain embodiments. Other thicknesses and ranges may be used in other embodiments of this description. The first baffle 226, the second baffle 228, and the third baffle 236 can be concentric around the longitudinal axis 216 (for example, they can be geometrically formed by rotating the cross-section shown in FIG. 1 around the longitudinal axis). Similarly, the filter element 200 can be concentric with the tank 104 and with the cover bolt 300. Other configurations are possible in other embodiments of this description. The cover bolt 300 can be attached to the tank 104 or the base 102, fixing the position of the cover bolt 300 with respect to the tank 104 and / or the base 102. A filter element 200 will now be described that can be supplied as a spare part according to an embodiment of the present description and can be used with the tank filter system 100 just described with reference to FIGS. 1 and 2. The filter element 200 can include a filter pulsation dampening device 224 having a filter element baffle 236' extending longitudinally upward from the upper open end 220 (e.g., upper end cap 208) or from the center tube 206 of the filter element 200. The filter element 200 may further comprise a cover bolt 300 with a bolt baffle 226' extending radially outward and longitudinally upward from the cover bolt 300 through the upper open end 220 (e.g., the upper end cap 208) of the filter element 200, terminating in a free end of bolt baffle 240 in close relation to, but separated from, the filter element baffle 236', defining a flow passage 230 having a minimum distance 232 between the filter element baffle 236' and the bolt baffle 226'. The minimum distance 232 may vary from 0.1 mm to 5.0 mm. This distance may vary as previously described. In the embodiment shown in FIGS. 1 and 2, the filter element baffle 236' may be attached to the upper open end 220 (e.g., the upper end cap 208) of the filter element 200, to the center tube 206, or both. The bolt baffle 226' may be attached to the cover bolt 300 at a point 242 arranged longitudinally below the upper open end 220 (e.g., the upper end cap 208) of the filter element 200. As previously mentioned herein, the filter element baffle 236' and the bolt baffle 226' comprise a thermoplastic material and have the same thickness, which varies from 0.1 mm to 54.0 mm. Other variations are possible as previously described herein. Similarly, the filter element baffle 236', and the bolt baffle 226' can be concentric around the longitudinal axis 216 (for example, they can be formed by rotating the transverse geometry in FIG. 1 around the longitudinal axis 216). The center tube 206 and the cover bolt 300 can be separate components or can be formed as a unitary component. The 300 cover bolt will now be described in further detail with continued reference to FIGS. 1 and 2. The cover bolt may comprise at least partially cylindrical body 300 defining a cylindrical shaft 302 and a radial direction 304. The cover bolt 300 may have a head 306 defining a head diameter 308, and a shaft portion 310 extending axially from the head 306. The shaft portion 310 defining a shaft portion diameter 312 that is smaller than the head diameter 308, forming a bearing surface 314 configured to contact a portion of the filter element 200. A first baffle 226 (as previously described herein) may extend from the shaft portion 310. More specifically, the first baffle 226 may extend from the side of the shaft portion 310, axially away from the head 306, and radially away from the shaft portion 310. The first baffle 226 can extend from the shaft portion 310 at a junction point 242, which is axially separated from the head 306 by an axial distance from the junction point 316 that varies from 50% to 100% of the filter length. The first baffle 226 can define a first baffle thickness 238 that varies from 0.1 mm to 54.0 mm. Other configurations and dimensional ranges are possible in other embodiments of this description. The first baffle 226 may terminate in a free end 240' that is also axially separated from the head 306 by an axial free end distance 318 that varies from 50% to 120% of the filter length. The free end 240' may also be radially separated from the shaft portion 310 by a radial free end distance 320 that varies from 10% to 98% of the center tube's internal diameter. Again, other configurations and dimensional ranges are possible in other embodiments of this description. Referring now to FIGS. 3 and 4, the 100' tank filter system (similar to the 100 tank filter system) using a 224' filter pulsation dampening device will now be described in accordance with other embodiments of the present description. The filtration pulsation dampening device 224' may include a first baffle 226'' extending from the cover bolt 300' and terminating at a first baffle free end 240'', and a flexible valve 244 extending from the filter element 200' defining a valve free end 246 that is arranged radially inward and longitudinally above the first baffle free end 240''. This construction defines a cut-off gap distance 248 between the first baffle valve free end 240'' and the flexible valve 244. The cut-off gap distance 248 may vary from 0.1 mm to 5.0 mm. As a result of the present design, one or more pressure pulsations 120 downstream of the annular filter medium 202 can be greatly reduced before reaching the annular filter medium 202. This, in turn, can reduce any degradation of the filter element's performance, such as its output to a motor or other downstream device. The cut-off gap distance 248 can be varied to achieve the desired effect, differing from the interval mentioned above in other embodiments of this description. The flexible valve 244 opens when there is no downstream pressure pulsation, allowing normal flow of filtered fluid. This arrangement of the flexible valve and the first baffle can be reversed in other embodiments of the present description. In FIGS. 3 and 4, the flexible valve 244 (e.g., a diaphragm, a flap, etc.) extends radially inward and longitudinally downward from the central tube 206 or the upper open end 220 (e.g., the upper end cap 208) of the filter element 200' '. In certain embodiments, the flexible valve 244 extends from the central tube 206 and terminates in the central reservoir 204 of the filter element 200'. The pulsation damping device 224' may also have a support baffle 250 extending from the upper open end 220 (e.g., the upper end cap 208) or the center tube 206 of the filter element 200' longitudinally below and parallel with the flexible valve 244. The first baffle 226' and the support baffle 250 may comprise the same material (similar to that described earlier herein) and may have the same thickness 238''. The support baffle 250 terminates in a free end of support baffle 252 that is arranged radially outward and longitudinally above the free end of valve 246. The support baffle 250 may help to support the flexible valve 244 so that it does not tear, deform excessively, or otherwise become ineffective as the flexible valve 244 opens and closes in the first baffle 266. A second baffle 228' includes a serpentine shape (e.g., an S-shaped curve, a wavy curve, etc.) extending longitudinally below the upper open end 220 (e.g., the upper end cap 208) of the filter element 200', terminating at a second free end of the baffle 254 that is arranged longitudinally above the valve free end 246. The second baffle 228' may extend entirely from the base 102 or may be divided into two pieces, including a lower piece extending from the upper end cap and an upper piece extending from the base to the filter element, creating a seal between these components, etc. The support baffle and the second baffle may also be integrated into a single baffle extending from the filter element and contacting the base. Other configurations are possible in other embodiments of the present description. The second baffle 228' can limit the upward movement of the flexible valve 244 as it opens so that it does not tear, deform, or otherwise become ineffective as the flexible valve 244 opens and closes. Similar to what was previously described herein, the first baffle 226'', the second baffle 228', the support baffle 250, and the flexible valve 244 are concentric around the longitudinal axis 216. That is, these components can be created by rotating the transverse geometry around the longitudinal axis 216. Likewise, the filter element 200' can be concentric with the tank 104 and with the cover bolt 300'. The cover bolt 300' can be attached to the tank 104 or the base 102, fixing the position of the cover bolt 300' with respect to the tank 104 and / or the base 102. Other constructions are possible in other embodiments of this description. A filter element 200', which can be supplied as a spare part according to an embodiment of the present description, will now be described. This element can be used with the newly described reservoir filter system 100', with reference to Figures 3 and 4. The filter element 200' includes a filter pulsation dampening device 224', which has a flexible valve 244 defining a valve free end 246 disposed in the central reservoir 204 of the central tube 206. The flexible valve 246 extends radially inward and longitudinally downward from either the central tube 206 or the upper open end 220 (for example, the upper end cap 208) of the filter element 200'. As shown in Figures 3 and 4, the flexible valve 246 actually extends from the central tube 206 in the embodiment shown. The pulsation dampening device 224' may include a radially external baffle 256 extending from the central tube 206, which is arranged longitudinally below the flexible valve 244. The radially external baffle 256 extends longitudinally downwards and radially inwards from the central tube 206. The radially external baffle 256 terminates in a free external baffle end 258 that separates longitudinally above and radially outwards away from the free valve end 246. The radially external baffle 256 may comprise a thermoplastic or other suitable material as previously described herein. The radially external baffle 256 has an external baffle thickness 260 ranging from 0.1 mm to 5.0 mm. The flexible valve 244 may comprise a rubber or other suitable material. The flexible valve 244 has a valve thickness 262 ranging from 0.01 mm to 5.0 mm (it may be made of an elastomer such as is used in seals, and the range may be more specifically from 0.1 mm to 5.0 mm, etc.). These dimensional ranges may differ in other embodiments of this description. The flexible valve 244 and the radially internal baffle 256 can be concentric around the longitudinal axis 216 as previously mentioned herein. This may not be the case for other configurations. The cover bolt 300' may have an internal radial baffle 322 extending longitudinally upward and radially outward from the cover bolt 300', terminating in an internal baffle free end 324. The internal baffle free end 324 may be arranged radially outward and longitudinally below the free end of the valve 246, defining a gap 264 with a minimum gap distance 266 ranging from 0 mm to 10.0 mm. The range for this distance may be different in other embodiments of the present description. The cover bolt 300' will now be described in more detail with continued reference to FIGS. 3 and 4. The cover bolt 300' may be constructed similarly to that described above herein with respect to FIG. 1. The cover bolt 300' may also include a first deflector 226'' extending from the shaft portion 310. The first deflector 226'' may extend axially away from the head 306 and radially away from the shaft portion 310. More specifically, the first baffle 226'' may extend from the shaft portion 310 at a junction point 242' that is axially separated from the head 306 by an axial junction point distance 316' that varies from 50% to 100% of the filter length, and the first baffle 226'' defines a first baffle thickness 238' that varies from 0.1 mm to 5.0 mm. These dimensional ranges may differ in other embodiments of the present description. Furthermore, the first deflector 226'' may terminate in a free end 240' ' ' that is axially separated from the head 306 by an axial free end distance 318' that varies from 5.0 mm to 15.0 mm. The free end 240' ' ' may also be radially separated from the shaft portion 310 by a radial free end distance 320' that varies from 5.0 mm to 15.0 mm. Any of the aforementioned dimensions and configurations may differ from those specifically stated herein. Furthermore, the materials of the various components described above may differ from those specifically mentioned. Industrial application In practice, a filter element, cover bolt, or tank filter system may be obtained or supplied in an OEM (original equipment manufacturer) or aftermarket context according to various modalities of the present description. The center tube and cover bolt can be made of any suitable material, including plastic, metal, etc. It may be desirable to choose materials that are chemically compatible with the fluids being filtered. Several parameters can be measured to determine the effectiveness of any of the methods described herein for a particular application. For example, at point A in Figures 1 and 3, the magnitude of the pressure pulse 120, the pressure, and the flow rate of the outgoing fluid can be monitored. Furthermore, at point B in Figures 1 and 3, the baseline pressures of the pressure pulses and the fluid pressure can be monitored. The fluid pressure drop and flow rate can then be determined as a function of opposing pressure pulses. The geometry of the pulse damping mechanism can be adjusted to achieve the desired outgoing fluid flow rate and / or the desired pulse pressure exerted on the filter medium, etc. Additionally, or instead of the actual evaluation, these parameters can determine the geometry of the custom pulsation damping device using AEF (finite element analysis). Only the central reservoir, the outlet, and any areas in fluid communication between these areas (defined by the baffles) may need to be molded. It will be appreciated that the preceding description provides examples of the assembly and technique described. However, it is understood that other implementations of the description may differ in detail from the examples above. All references to the description or examples thereof are intended to refer to the particular example being described at that time and are not intended to imply any limitation on the scope of the description in general. Any language of distinction or disparagement with respect to certain features is intended to indicate a lack of preference for those features, but not to exclude them from the scope of the description entirely unless otherwise stated. r Lcicnn / zznz / E / YiAi The mention of value ranges herein is intended merely as a shorthand method for referring individually to each separate value within the range, unless otherwise stated herein, and each separate value is incorporated into the description as if it were mentioned individually herein. It will be evident to a person skilled in the art that various modifications and variations to the embodiments of the apparatus and assembly methods as described herein may be made without departing from the scope or spirit of the invention. Other embodiments of the present description will become evident to those skilled in the art from consideration of the description and the implementation of the various embodiments described herein. For example, some parts of the apparatus may be constructed and operated differently from how described herein, and certain steps of any method may be omitted, performed in a different order than specifically mentioned, or in some cases performed simultaneously or in sub-steps.Furthermore, variations or modifications can be made to certain aspects or features of various modalities to create more modalities and features, and aspects of various modalities can be added or replaced by other features or aspects of other modalities to provide more additional modalities. Therefore, this description includes all modifications and equivalents of the object stated in the appended claims as permitted by applicable law. Furthermore, the description covers all combinations of the elements described above in all possible variations thereof, unless otherwise stated herein or clearly contradicted by the context. It is hereby stated that, as of this date, the best method known to the applicant for putting the aforementioned invention into practice is the one that is clear from the present description of the invention.

Claims

1. A replaceable filter element comprising at least one partially cylindrical configuration defining a longitudinal axis and a radial direction, characterized in that it comprises: an annular filter medium defining a central passage; a central tube disposed in the central passage of the annular filter medium defining a central reservoir, the annular filter medium surrounding the central tube and the central reservoir; an upper open end attached to the central tube disposed along the longitudinal axis, the upper open end including an opening allowing fluid to flow from the central reservoir to the outside of the filter element; a lower open end attached to the central tube opposite the upper open end disposed along the longitudinal axis;and a filter pulsation dampening device that includes a filter element baffle extending longitudinally upwards from the upper open end or from the center tube of the filter element.

2. The replaceable filter element according to claim 1, characterized in that it further comprises a cover bolt and a bolt deflector extending radially outward and longitudinally upward from the cover bolt through the upper open end of the filter element, terminating in a free end of the bolt deflector in close relation to, but separated from, the filter element deflector, defining a flow passage having a minimum distance between the filter element deflector and the bolt deflector.

3. The replaceable filter element according to claim 2, characterized in that the filter element baffle is attached to the upper open end of the filter element.

4. The replaceable filter element according to claim 3, characterized in that the bolt deflector is attached to the cover bolt at a longitudinally arranged attachment point below the upper open end of the filter element.

5. The replaceable filter element according to claim 2, characterized in that the minimum distance varies from 0.1 mm to 5.0 mm.

6. The replaceable filter element according to claim 4, characterized in that the filter element baffle and the bolt baffle comprise thermoplastic material and have the same thickness ranging from 0.1 mm to 5.0 mm.

7. A pulse-damping interface between a filter and a filter base configured to mitigate pulses, characterized in that it comprises: a filter element including at least a partially cylindrical configuration and defining a longitudinal axis and a radial direction, the filter element comprising: an annular filter medium defining a central passage; a central tube disposed in the central passage of the annular filter medium defining a central reservoir, the annular filter medium surrounding the central tube and the central reservoir; an upper open end attached to the central tube disposed along the longitudinal axis, the upper open end including an opening allowing fluid to flow from the central reservoir to the outside of the filter element; and a lower open end attached to the central tube opposite the upper open end disposed along the longitudinal axis; and a cover bolt.r Lacnn / zznz / E / YiAi a base that interconnects with the filter element; and a filter pulsation dampening device; wherein the filter pulsation dampening device includes a first baffle extending from the cover bolt, and a second baffle extending from the base or the filter element that is disposed close to the first baffle, defining a flow passage with a minimum distance between the first baffle and the second baffle.; 8. The interface according to claim 7, characterized in that the first deflector extends radially outwards and longitudinally upwards from the cover bolt passing through the upper open end of the filter element, and the second deflector is attached to the base and extends longitudinally downwards and radially inwards from the base passing through the upper open end of the filter element.

9. The interface according to claim 8, characterized in that the second deflector defines an S-shaped portion.

10. The interface according to claim 9, characterized in that it further comprises a third deflector extending longitudinally from the S-shaped portion of the second deflector to the upper open end or central tube r Lcicnn / zznz / E / YiAi, forming a downward-facing V-shaped region with the second deflector, and the first deflector is disposed between the second deflector and the third deflector, defining a serpentine flow passage, and the third deflector is attached to the upper open end or central tube.

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