Filtering device for extracting beverages

Abstract

A filter device (10) for extracting a beverage (B) by diafiltration comprises a tubular body (11) and a support (12) for accommodating a filter (13) on which a powder product (C) is placed.

Description

Technical Field

[0001] This invention relates to a filtration apparatus for extracting beverages, particularly by means of percolation. The filtration apparatus of this invention is particularly suitable for preparing coffee or other beverages, such as tea, herbal teas, etc., from powdered or granular products. The following description will particularly relate to the preparation of coffee. Background Technology

[0002] As is well known, there are various ways to obtain coffee beverages from powdered products, namely by using coffee machines, coffee pots, etc., or by using containers and filtering devices for percolation or brewing.

[0003] Coffee extraction via percolation essentially involves pouring hot water onto coffee grounds and collecting the beverage in a container below through a filter, which can be made of, for example, paper, fabric, metal, or plastic. Using a technique known as "pour over," the hot water passes through the coffee grounds held in the filter solely by gravity.

[0004] On the other hand, coffee brewing is achieved by pouring hot water into a vessel and allowing ground coffee to steep for a few minutes. After the desired steeping time, a filter is used to separate the liquid from the ground coffee, thus obtaining the beverage.

[0005] A method for preparing beverages using a percolation filtration system is known in the prior art, and is named "V60". The name is derived from the degree measure of the angle at the apex of the container and the disposable paper filter, both of which have a conical shape.

[0006] This percolation filtration system is essentially instantaneous, meaning that water rapidly passes through the coffee grounds and comes into contact with them for a very limited time. Therefore, this system does not allow for the production of a beverage with optimal sensory characteristics, as the amount of time the water is in contact with the coffee grounds is generally insufficient to absorb the sensory properties of coffee in a satisfactory manner.

[0007] Furthermore, this type of percolation filtration system requires a high level of skill from the user. The user must ensure that the liquid is distributed as evenly as possible across the powdered product to avoid bypass phenomena, which occur when liquid may pass through the filter above a filter where no powdered product is present. The user must also avoid channeling phenomena, where liquid enters the powdered product with forces that preferentially allow it to pass through channels, rather than being evenly distributed throughout the product. Clearly, these phenomena lead to partial and uneven extraction of the beverage, thus compromising its quality.

[0008] Another method for preparing coffee by percolation is described in document US-B-7849784, in which a filter is positioned above a container. This filter provides the use of a cylinder, at the lower end of which, near the container, is a filter containing coffee grounds. The lower end is configured as a grid on which the filter rests. A certain amount of water is poured into the cylinder above the coffee grounds, and a piston is used to force the water through the coffee grounds. This piston can be inserted from the upper part of the cylinder and is configured to apply pressure to a volume of air above the water.

[0009] The system is quite complex and requires various tools, such as a cylinder and a piston. Furthermore, in this case, the contact time between the water and the coffee grounds is quite limited. Whenever the user wants to prepare a beverage, they also need to apply pressure to the piston. On the one hand, the presence of the grid is necessary to prevent the pressure of the piston from causing the filter to detach from the cylinder; on the other hand, it obstructs the flow of the beverage, resulting in an increase in the pressure the user must apply to the piston to obtain the beverage.

[0010] Document WO2007 / 119546A describes a coffee extractor that essentially comprises two overlapping containers, one for supplying water at the top and the other for collecting coffee at the bottom. A filter holder for holding coffee grounds is also positioned between the two containers, defining a closed chamber for holding the coffee. This configuration inevitably involves the compaction of the coffee grounds within the closed chamber, forming coffee clumps. This is certainly undesirable, as the denser the powder, the less likely it is to be properly and completely extracted from the beverage. To achieve this, water needs to be evenly distributed within the chamber, and the amount of time all coffee grounds are in contact with water must be sufficient to ensure beverage extraction.

[0011] The extractor is quite large because, for example, the filter holder is positioned at a certain distance from the water container above. The water supply container and the filter holder are separated by a vertical conduit several centimeters long.

[0012] Given its construction, this extractor, which consists of many parts, is quite difficult to assemble and does not allow for optimal uniformity of water distribution on the product contained in the filter holder.

[0013] The presence of a vertical water supply conduit means that water reaches the filter holder at different pressures and velocities between the center and the surrounding circular edge areas. Specifically, in the area directly below the conduit, the water pressure and velocity are very high, causing pores to form in the coffee block. These pores define a preferential path for the water. Through these pores, the water flows very quickly, with insufficient residence time for complete extraction.

[0014] In addition, the extractor features a paper filter supported by a mesh, creating an area below the filter that resists the free passage of the beverage.

[0015] Therefore, in addition to introducing hydraulic resistance to the advance of the liquid, the construction of the extractor described in WO2007 / 119546 also leads to the generation of preferential extraction channels, thus causing channeling phenomena.

[0016] Another well-known method for obtaining coffee beverages is the use of sealed capsules, preferably airtight, containing a predetermined dose of coffee powder, through which hot water is passed when the capsule is placed in a special beverage extraction machine. Examples of this type of capsule are described in prior art documents KR20120114736A and WO2015 / 124534A.

[0017] Therefore, there is a need to improve the filtration device for extracting beverages, which can overcome at least one of the disadvantages of the prior art.

[0018] In particular, one object of the present invention is to provide a filtration device for extracting beverages that is easy to manufacture and use.

[0019] Another object of the present invention is to provide a filtration device that, compared with known systems, allows for a slower and more gradual extraction of the beverage, thereby improving the sensory properties of the beverage.

[0020] Another object of the present invention is to provide a filtration device in which a beverage is obtained substantially by gravity by means of water passing slowly through coffee grounds positioned on a filter.

[0021] Another object of the present invention is to provide a filtration device that allows for uniform extraction of the beverage and ensures that the liquid evenly wets the coffee powder.

[0022] The applicant has designed, tested and implemented the present invention to overcome the disadvantages of the prior art and to obtain these and other objectives and advantages. Utility Model Content

[0023] The invention is set forth and characterized in the independent claims. The dependent claims describe other features of the invention or variations of the main inventive concept.

[0024] According to the above objectives, the filtration device for extracting beverages according to the present invention includes a tubular body and a support for housing the filter, on which a powdered product (e.g., coffee powder) is placed.

[0025] According to some implementations, the tubular body is open at the top. This makes it easier to use a filtration device and means that the powdered product can be placed randomly, as it settles after falling without any powder compaction. This is advantageous compared to known solutions in the prior art, where the powder is contained in a closed chamber, which inevitably leads to powder compaction and thus impairs beverage extraction efficiency.

[0026] According to one aspect of the invention, the filtration device provides a chamber for containing liquid, particularly hot water, located outside a tubular body. The chamber has a bottom positioned at a height higher than the filter itself, and is fluidly connected to the tubular body by means of a plurality of through-holes that allow liquid to flow from the chamber to the tubular body by gravity, thereby flowing to the powdered product. Furthermore, the chamber is annular and arranged around the tubular body.

[0027] According to some implementation schemes described here, the annular chamber is open at the top.

[0028] Due to the separation between the liquid-containing chamber and the tubular body containing the powdered product (e.g., coffee powder), the time for the liquid (especially hot water) to pass through the powdered product can be advantageously extended, thereby obtaining a beverage with better sensory properties by percolation compared to that obtained using conventional apparatus.

[0029] This device is also advantageous because it is compact, easy to manufacture, and does not require the user to use cylinders, pistons, etc.

[0030] The annular shape of the chamber also allows the extracted beverage to be evenly distributed around the entire filter, thereby distributing it around the powdered product, further increasing the uniformity of contact with and passage of the product.

[0031] According to another aspect of the invention, the chambers are arranged concentrically around the tubular body. In this way, hot water penetrates laterally into the coffee grounds, which facilitates the uniform extraction of the beverage along the entire circular perimeter.

[0032] According to another aspect of the invention, the chamber has a truncated conical shape, the cross section of which decreases from the upper opening toward the bottom.

[0033] According to another aspect of the invention, the bottom slopes downward toward the tubular body and toward the through-hole. This detail, for example, prevents possible liquid stagnation.

[0034] According to another aspect of the invention, the through holes are uniformly distributed on the tubular body. The through holes may also be radially oriented or have a tangential component.

[0035] According to another aspect of the invention, the through hole slopes downward toward the interior of the tubular body.

[0036] According to another aspect of the invention, the through hole is positioned adjacent to the bottom of the chamber.

[0037] According to another aspect of the invention, the through hole is cylindrical in shape.

[0038] According to another aspect of the invention, the through-hole has a truncated conical shape and a larger cross-section on the liquid inlet side and a smaller cross-section on the liquid outlet side.

[0039] The size of these pores can be adjusted to obtain a uniform extraction and beverage, requiring a smaller amount of powdered product (e.g., coffee powder) for the same total dissolved solids (TDS) compared to current commercially available preparation methods.

[0040] According to another aspect of the invention, the tubular body can be screwed into a support integral with the chamber.

[0041] According to another aspect of the invention, a component for holding the filter in place is positioned between the tubular body and the support. These components may be, for example, a labyrinth system, a gasket, etc. Attached Figure Description

[0042] Referring to the accompanying drawings, these and other aspects, features, and advantages of the invention will become apparent from the following description of some embodiments given as non-limiting examples, wherein:

[0043] - Figure 1 This is a longitudinal cross-sectional view of a filtering device for extracting beverages according to the present invention, the filtering device being disposed on a container for collecting the extracted beverages;

[0044] - Figure 2 This is a three-dimensional top view of the filtering device of the present invention;

[0045] - Figure 3 This is a three-dimensional bottom view of the filtering device of the present invention;

[0046] - Figure 4 This is a longitudinal cross-sectional view of a portion of the filter device of the present invention, which has holes for liquid to pass through;

[0047] - Figure 5 yes Figure 4 A longitudinal cross-sectional view of a variant of the hole;

[0048] - Figure 6 This is a cross-sectional view of the tubular body of the filter device of the present invention, considering the through-holes for liquid passage;

[0049] - Figure 7This is another cross-sectional view of the tubular body that provides different constructions of the through-hole;

[0050] - Figure 8 This is a longitudinal cross-sectional view of a variant of the filtering device of the present invention;

[0051] - Figure 8a It is similar to Figure 8 The view, which is magnified. Figure 8 Details of the filtration device;

[0052] - Figure 9 This is a longitudinal cross-sectional view of another variation of the filtering device of the present invention;

[0053] - Figure 9a It is similar to Figure 9 The view, which is magnified. Figure 9 Details of the filtration device.

[0054] We must clarify that the wording and terminology used in this specification, as well as the figures in the described drawings, are only for better illustration and explanation of the invention. Their function is to provide non-limiting examples of the invention itself, since the scope of protection is defined by the claims.

[0055] For ease of understanding, the same reference numerals are used to identify the same general elements in the figures where possible. It should be understood that elements and features of one embodiment can be readily combined or incorporated into other embodiments without further clarification. Detailed Implementation

[0056] We will now refer in detail to possible embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings by way of non-limiting example. The wording and terminology used herein are also for the purpose of giving non-limiting examples.

[0057] Refer to the accompanying drawings, especially see Figure 1 , Figure 2 and Figure 3 The filtration device 10 for extracting beverage B includes a tubular body 11 and a support 12 for housing a filter 13 on which a powdered product C, such as ground coffee, or a preparation of coffee, tea, herbal tea, etc., is placed. The support 12 is specifically positioned at the lower end of the tubular body 11. The support 12 may, for example, be provided with an annular step 31 projecting inward from the lower end of the tubular body 11.

[0058] The filter device 10 provides a chamber 14 for containing liquid W (particularly hot water), which is located outside the tubular body 11. The chamber 14 has a bottom 15 positioned at a height higher than that of the filter 13, and the chamber 14 is fluidly connected to the tubular body 11 by means of a plurality of through holes 16, which allow the liquid W to flow from the chamber 14 to the tubular body 11 by gravity, and thus to the powder product C.

[0059] The filter 13 can be made of plastic, metal, etc., and includes a series of appropriately sized through-holes 17. Alternatively, such as Figure 8 or Figure 9 As shown, a paper filter 25 can be provided.

[0060] The filter device 10 is positioned on the container 18, in which the beverage B extracted by percolation is collected. The container 18 can be of any type, such as a cup, a kettle, or other types known in the art, as long as its size is suitable to allow the filter device 10 to be stably positioned thereon.

[0061] In the example shown here, the filter device 10 includes a flange 19 configured to allow it to rest on the upper edge of the container 18 during use.

[0062] The flange 19 is concentrically arranged around the tubular body 11.

[0063] The flange 19 is provided with an annular step 20, which is configured to allow the filter device 10 to rest stably on the container 18. Of course, different resting systems can also be provided without the flange 19 and the annular step 20.

[0064] In other embodiments not shown, additional temporary and removable coupling systems may be provided between the filter device 10 and the container 18. As a non-limiting example, the filter device may include threads that allow the filter device 10 to be screwed into the associated container 18, which is also provided with corresponding threads. Alternatively, a mechanical conformal coupling with interference (e.g., male-female type), particularly with annular ridges engaging in corresponding grooves, may be provided.

[0065] An annular recess 21 is formed between the tubular body 11 and the flange 19. Ribs 22 are positioned within the annular recess 21. If the flange 19 and step 20 are not provided, the ribs 22 can be used to allow the filter device 10 to rest on the container 18. The ribs 22 are also useful because they provide an outlet for water vapor formed on the beverage B, thereby preventing the formation of condensate. Furthermore, the ribs 22 can function to reinforce the filter device 10.

[0066] The chamber 14 into which the user pours hot water is annular and arranged around the tubular body 11. In particular, the chamber 14 is arranged around the tubular body 11 without any interruption in continuity. This allows, for example, hot water to impact the powder product C at 360° through the through-hole 16, thereby achieving optimal uniformity in contact with and through the powder.

[0067] The chamber 14 is concentrically arranged around the tubular body 11, so that it has a uniform width around the tubular body 11.

[0068] The chamber 14 preferably has a truncated conical shape, particularly its cross section decreases from the upper orifice 24 toward the bottom 15, so as to ensure better distribution of hot water to the through hole 16.

[0069] The tubular body 11 may provide a first portion 11a having a truncated conical cross section and a second portion 11b having a cylindrical cross section, the first portion 11a decreasing from the corresponding upper orifice 23 into which the powder product C is introduced, and the second portion 11b extending to the vicinity of the support 12 of the filter 13.

[0070] In the example described here, the upper orifice 24 of chamber 14 and the corresponding upper orifice 23 of tubular body 11 are exposed to the surrounding environment, such that both chamber 14 and tubular body 11 are open. This avoids overpressure, which would cause the coffee grounds to compact and produce hot water parameters (pressure, speed) unsuitable for effective extraction.

[0071] The support 12 is integral with the chamber 14 and provides an annular wall 26 in which threads 27 can be formed, which are configured to engage with corresponding reverse threads 28 formed in the second part 11b. In this way, the tubular body 11 can be substantially screwed onto and unscrewed from the support 12, and thus unscrewed from the chamber 14.

[0072] Therefore, the filter device 10 can be made into, for example, two parts: a tubular body 11 and a chamber 14 with a support member 12, the tubular body 11 being screwed into the support member 12. These two parts can be made of plastic or thermoplastic materials (such as polypropylene), metal materials, etc.

[0073] The bottom 15 of the chamber 14 slopes downward toward the tubular body 11 and toward the through hole 16 to allow water to pass through and to allow the chamber 14 to be effectively emptied.

[0074] The through-hole 16 is positioned adjacent to the bottom 15 to allow access to all water poured into the chamber 14.

[0075] To ensure that water is distributed more evenly to the powder product C, the through holes 16 are evenly distributed on the tubular body 11, so that they are distributed in 360° and are equally spaced from each other.

[0076] See, for example Figure 4 The through-hole 16 may be inclined downward toward the interior of the tubular body 11 or pointed horizontally. In either case, it is preferred that the through-hole 16 has a certain inclination to facilitate the outflow of water.

[0077] Through hole 16 can have the following characteristics: Figure 4 The cylindrical shape shown, or having a truncated conical shape, see, for example Figure 5 Through hole 16'. In this case, through hole 16' has a larger cross-section on the inlet side of liquid W and a smaller cross-section on the outlet side.

[0078] Through hole 16 or 16' can be radially oriented, such as... Figure 6 As shown in the example, or to provide the tangential component, please refer to [link to example]. Figure 7 The orifice 16" in the middle, with the help of the tangential component, generates a flow that helps to further increase the uniformity of contact between the liquid W and the powder product C. In fact, this tangential component can bring a vortex component to the flow that improves the liquid distribution in the powder product C.

[0079] Therefore, in some embodiments of the invention, the through holes may have a truncated conical shape, which gives them a certain inclination to facilitate the outflow of liquid, such as, for example... Figure 5 Holes 16', and they can simultaneously have a certain tangential component, such as, for example Figure 7 "16" or even just one of these tilt / components.

[0080] Figure 8 , Figure 8a A variation of the filtration device 10a of the present invention, equipped with a paper filter 25 positioned at the bottom between the end 29 of the tubular body 11 and the support member 12, is shown. Specifically, the end 29 and the support member 12 are shaped to engage with each other and form a labyrinth system 30, thereby clamping the filter 25 in place, particularly its peripheral portion. Specifically, the labyrinth system 30 may have one or more protrusions 33 and one or more recesses 34 at the end 29 and the support member 12, which can connect with each other when the tubular body 11 is fully screwed into the support member 12.

[0081] Therefore, before screwing the tubular body 11 into the annular wall 26 of the support 12, the user positions the filter 25 above the annular step 31. Then, he screws the tubular body 11 into the support 12, thus clamping the filter 25 in place. At this point, he will be able to pour the desired amount of powder product C onto the filter 25.

[0082] Figure 9 , Figure 9a Another variation of the filter device 10b of the present invention is shown, wherein the opposing surfaces of the end 29 and the support 12 are substantially flat and spaced apart from each other, and a gasket 32 ​​for clamping the filter 25 is disposed between them. In particular, once the tubular body 11 is screwed into the support 12, the peripheral portion of the filter 25 remains confined between the gasket 32 ​​and the annular step 31 of the support 12.

[0083] Therefore, the labyrinth system 30 and the washer 32 are two examples of components used to hold the filter 25 in place between the tubular body 11 and the support 12.

[0084] The user places the filter devices 10, 10a, 10b on the container 18 (e.g., a kettle, cup, etc.) and pours the desired amount of powdered product C onto the filter 13. Then, the user pours liquid W (especially hot water) into the chamber 14. The hot water passes through the through-holes 16, 16', 16" and slowly agitates the powdered product C, percolating it in the container 18, thus allowing the beverage B to be obtained.

[0085] Figure 8 and Figure 9 The embodiments of the filter devices 10a and 10b also advantageously allow for the removal of powdered product C and disposable paper filter 25 after the beverage B is obtained. In fact, the user simply places the filter devices 10a and 10b on a suitable container for processing and unscrews the tubular body 11 from the support 12. In doing so, the filter 25 is no longer held in place by the retaining member, and the weight of the powdered product C, moistened by the beverage extraction, is sufficient to cause the filter 25 and the dose of powdered product C present on the filter 25 to fall off due to gravity.

[0086] We have tested and obtained beverage B by using approximately 12 grams of powdered product C (especially coffee powder) and 300 ml of liquid W (especially hot water) over a period of approximately 3 minutes and 30 seconds. Furthermore, as mentioned above, advantageously, the same TDS as conventional filtration systems can be obtained by means of the filtration devices 10, 10a, 10b of the present invention, but with a smaller amount of powdered product C.

[0087] This time is much longer than the shorter time required to obtain a beverage using a conventional filtration system (with or without a cylinder and plunger), therefore the resulting beverage B has better sensory properties than beverages obtained using such known systems. Furthermore, the filtration device of the present invention advantageously avoids bypass and channeling phenomena, thereby preventing the formation of liquid-preferred pathways that could impair extraction uniformity and thus beverage quality in known systems. In addition, filtration devices 10, 10a, and 10b are easy to use and require less manual skill from the user compared to known systems.

[0088] Example 1

[0089] Table 1 below shows examples of how to use filter devices 10a, 10b, and 10c, with seven extractions performed using these filter devices. In comparison, three extractions were performed using a conventional V60 filter system.

[0090] The data shows that, with the same formulation and particle size, and therefore with the same surface area available for extraction, the filter device of the present invention has a higher extraction efficiency than conventional filters (such as V60).

[0091] Table 1:

[0092]

[0093]

[0094] The results shown in Table 1 are particularly significant because there are no bypasses or channels in the filtration device of the present invention; that is, there are no preferred channels (paths with minimal hydraulic resistance) for water that would typically not extract coffee. This is achieved, in particular, through the separation between the feed chamber 14, the tubular body 11, and the container 18, and the shape of the filtration device of the present invention, wherein the chamber 14 is annular and arranged around the tubular body 11. The chamber 14 is also fluidly connected to the tubular body 11 by means of a plurality of through-holes 16, 16', 16" which allow liquid W to flow from the chamber 14 to the tubular body 11 by gravity, thereby uniformly distributing it to the powdered product C.

[0095] Furthermore, if the 16” through-hole provides a tangential component, such as Figure 7 As shown, the vortex motion of the liquid triggered by the arrangement of the orifices 16” can potentially provide agitation of the powder product C. Agitation in conventional methods relies on operator skill and can lead to the extraction of unwanted substances.

[0096] The filter device of this invention also allows for the avoidance of perforation of the powder product C, which is typically a compact assembly when placed in the filter. This phenomenon can occur in conventional water-pouring techniques.

[0097] In addition, to obtain a lower extraction rate at the same particle size, it is sufficient to simply reduce the amount of coffee or increase the amount of water, i.e., change the coffee / water ratio.

[0098] Due to bypass and channeling phenomena, the same thing cannot be achieved with conventional filters. In fact, in case 3 of the V60, the particle size changed (became finer), thus increasing the extraction surface. However, despite the larger extraction surface and longer extraction time (4 minutes), the single extraction rate did not increase much, entirely due to bypass and channeling phenomena.

[0099] Compared to conventional methods, the filtration device of this invention, due to its geometry, allows for the use of less coffee or a larger amount of water to obtain a beverage with an ideal extraction rate (17-27%). This saves costs for the user. See, for example, extraction number 7 in Table 1.

[0100] Furthermore, this preparation does not require the typical pouring and preparation techniques of conventional methods, which require trained personnel and their constant presence throughout the extraction process.

[0101] By using the filtration device of the present invention, this situation does not occur, and the result obtained is controlled extraction within a time suitable for wetting all coffee particles and extracting their substances, which is different from what happens in conventional filters, where the time is shorter and the presence of bypass and channel phenomena does not allow for proper extraction of substances from coffee.

[0102] Example 2

[0103] Table 2 below shows additional extractions made with different types of coffee and a coarser grind (level 4).

[0104] The following data percolation is performed using the filtration devices 10a, 10b, and 10c of this invention for six cycles to demonstrate the repeatability and consistency of the extraction facilitated by their geometry. The particle size, weight, and coffee used were the same.

[0105] Table 2:

[0106]

[0107] It is clear that modifications and / or additions can be made to various parts of the filtration device for extracting beverages as described above without departing from the scope and range of the invention as defined in the claims.

[0108] It is equally clear that, although the invention has been described with reference to some specific examples, those skilled in the art will be able to implement other equivalent forms of the filtering device for extracting beverages, which have the features described in the claims and therefore all fall within the scope of protection defined by the claims.

[0109] In the following claims, the references in parentheses are for ease of reading only and should not be considered as limiting factors regarding the scope of protection defined by these claims.

Claims

1. A filtration apparatus (10, 10a, 10b) for extracting a beverage (B), the filtration apparatus comprising a tubular body (11) and a support (12) for accommodating a filter (13, 25), wherein a powdered product (C) is placed on the filter, characterized in that, The filtration device provides a chamber (14) for containing liquid (W) outside the tubular body (11). The chamber has a bottom (15) positioned at a height higher than that of the filters (13, 25). The chamber is fluidly connected to the tubular body (11) by means of a plurality of through holes (16, 16', 16") that allow the liquid (W) to pass from the chamber (14) to the tubular body (11) by gravity, thereby to the powder product (C). The chamber (14) is also annular and arranged around the tubular body (11).

2. The filter device (10, 10a, 10b) according to claim 1, characterized in that The chamber (14) is concentrically arranged around the tubular body (11).

3. The filter device (10, 10a, 10b) according to claim 1, characterized in that The chamber (14) has a truncated conical shape, the cross section of which decreases from the upper opening (24) toward the bottom (15).

4. The filter device (10, 10a, 10b) according to claim 1, characterized in that The bottom (15) slopes downward toward the tubular body (11) and toward the through hole (16, 16', 16") 5. The filter device (10, 10a, 10b) according to claim 1, characterized in that The through holes (16, 16', 16") are evenly distributed on the tubular body (11) and are radially oriented or have a tangential component.

6. The filter device (10, 10a, 10b) according to claim 1, characterized in that The through holes (16, 16', 16") slope downward toward the interior of the tubular body (11).

7. The filter device (10, 10a, 10b) according to claim 1, characterized in that The through holes (16, 16', 16") are located adjacent to the bottom of the chamber (14).

8. The filtration device (10, 10a, 10b) according to any one of claims 1 to 7, characterized in that, The through hole (16) is cylindrical in shape.

9. The filter device (10, 10a, 10b) according to any one of claims 1 to 7, characterized in that The through-hole (16') has a truncated conical shape and a larger cross-section on the inlet side of the liquid (W) and a smaller cross-section on the outlet side.

10. The filter device (10, 10a, 10b) according to any one of claims 1 to 7, characterized in that The tubular body (11) can be screwed into the support (12) which is integral with the chamber (14).

11. The filter device (10, 10a, 10b) according to any one of claims 1 to 7, characterized in that Between the tubular body (11) and the support member (12), there are components (30, 32) for holding the filter (25) in place.

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