Coffee filter cup

Abstract

The utility model discloses a coffee filter cup, it includes cup body and the base of setting in the bottom of cup body, cup body has the internal space of containing filter paper, and the cross section area of this internal space gradually reduces along downward direction, is provided with several strip-shaped protrusions along the circumferential distribution of cup body on the inner surface of internal space, is provided with the filter out portion on the downside of internal space, and the middle part of filter out portion is opened first filter hole, is provided with several convex edges on the circumferential of first filter hole around on filter out portion, and each convex edge extends along the radial direction of first filter hole, is opened several second filter holes on filter out portion and is provided with along the circumferential of first filter hole, and the radius of second filter hole is less than the radius of first filter hole. The utility model discloses through the combination of first filter hole and second filter hole, can flexible switching fast flush and slow speed soak mode, cover from the full flavor extraction of refreshing fruit acid to mellow bitter sweet, satisfy the demand of various extraction mode of user.

Description

Technical Field

[0001] This utility model relates to a coffee filter cup for extracting coffee liquid from coffee powder obtained by grinding coffee beans. Background Technology

[0002] People's pursuit of coffee quality is also increasing. They not only demand a rich and full-bodied taste, but also want to savor the unique flavor of the coffee beans. To meet consumer demands, the design of coffee filters has undergone continuous iteration. Current coffee filters are mainly of the trapezoidal and conical shapes, improving extraction efficiency by incorporating raised strips on the inner surface of the filter wall and perforations in the bottom. This method allows water to effectively pass through the coffee grounds, and the raised strips on the inner surface of the filter wall provide good flow guidance, helping to release carbon dioxide and allowing for a longer contact time between water and coffee grounds, thus increasing the extraction rate. It should be noted that the term "trapezoidal" is used because the coffee filter paper appears trapezoidal when viewed from the front when installed on the coffee filter.

[0003] However, most existing filter cups have limitations. Their effectiveness is limited; the insufficient number of raised strips results in poor flow guidance, and they don't consider the commonly used table-shaped coffee filter paper, leading to insufficient adhesion between the filter paper and the cup wall, causing some water to drip into the sharing pot without reaching the coffee. Furthermore, during coffee extraction, different users require different approaches: sometimes a high flow for rapid extraction, and sometimes a low flow for slow extraction. Most existing filter cups have completely perforated bottom holes, and some have holes that are too small or too few, failing to meet the needs of high-quality and diverse coffee extraction.

[0004] Chinese utility model patent CN207384109U discloses a detachable double-layer coffee filter cup, which includes an outer cup, a filter cup wall, an inner layer, a handle, and a base. The filter cup wall is installed inside the outer cup, and the side of the outer cup is connected to the handle. The inner layer is connected to the inside of the outer cup, and a temperature-sensitive material is provided on the inner layer. The temperature-sensitive material is connected to the outer cup, and the bottom of the outer cup is connected to the base. The filter cup wall is composed of a spiral-patterned filter screen, an exhaust port, threads, a tapered opening, and filter screen holes. The bottom of the spiral filter screen is connected to the filter screen holes. The threads are evenly installed on the spiral filter screen, and the threads are connected to each other. The conical opening is connected to the lower end of the spiral filter screen. In the above structure, there is only one fully hollow filter screen hole at the bottom of the filter cup wall for filtering coffee liquid. The outlet hole is of a single type. When the user needs a slow extraction with a small water flow, the coffee liquid will flow out directly and will not stay at the bottom of the filter cup. The coffee liquid is filtered unevenly at the bottom of the filter cup, which makes it impossible for the coffee to have a better sweetness and body. Utility Model Content

[0005] The present invention aims to address the above-mentioned technical problems by providing a coffee filter cup that can simultaneously satisfy both slow extraction with a small water flow and rapid extraction with a large water flow, thereby improving the diversity of coffee extraction.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A coffee filter cup includes a cup body having an internal space for accommodating filter paper, the cross-sectional area of ​​which gradually decreases downwards. A plurality of strip-shaped protrusions distributed circumferentially along the inner surface of the internal space are provided. A filter outlet is provided on the lower side of the internal space, with a first filter hole in the center of the filter outlet. A plurality of raised ridges are provided circumferentially around the first filter hole on the filter outlet, each ridge extending radially along the first filter hole. A plurality of second filter holes are provided on the filter outlet, arranged circumferentially along the first filter hole, the radius of the second filter holes being smaller than the radius of the first filter holes.

[0008] According to this invention, the filter section has two different sized first and second filter holes. After the coffee liquid flows downward into the filter section, it first passes through the smaller radius second filter hole. If the user uses a slow extraction method with a small water flow, the slow-flowing coffee liquid will form a liquid film on the surface of the second filter hole due to the surface tension of the liquid and will not be filtered out in the second filter hole. As a result, the coffee liquid will continue to flow towards the first filter hole in the middle, increasing the residence time of the coffee liquid in the filter cup and giving the coffee liquid a better sweetness and body. Conversely, when the user chooses a large water flow extraction, because the coffee liquid flows into the filter section quickly, under the pressure, part of the coffee liquid will flow out when passing through the second filter hole, and the other part will flow out through the first filter hole in the middle. The multi-channel coordinated operation significantly shortens the liquid residence time, retains volatile aroma substances, and highlights the fresh flavor of the coffee. In addition, because the surface of the filter section has raised ridges, there is space between the bottom of the filter paper and the surface of the filter section for the coffee liquid to flow. The raised ridges also guide the flow of the coffee liquid, increasing its fluidity.

[0009] Based on the embodiments of this utility model, further optimizations can be made to this utility model. The optimized technical solutions are as follows:

[0010] In one specific embodiment, the upper surface of the filter section is formed with an inclined surface that slopes from the outer edge of the filter section toward the first filter hole. Due to the inclined surface design of the upper surface of the filter section, the coffee liquid is guided to converge toward the center, avoiding edge stagnation and improving extraction uniformity.

[0011] In one specific embodiment, a flow channel is formed between two adjacent strip-shaped protrusions to allow coffee liquid to flow into the filter section, and a fan-shaped area is formed between two adjacent protrusions that extends along the lower end of the flow channel, thereby forming a continuous flow channel. Because the flow channel on the inner wall of the cup and the fan-shaped area of ​​the filter section form a continuous channel, the flow path of the coffee liquid from top to bottom is unobstructed, reducing uneven extraction caused by localized blockages.

[0012] In one specific embodiment, each of the sector regions is provided with a plurality of second filter holes arranged along the radial direction of the first filter hole.

[0013] In one specific embodiment, the width of the convex ridge gradually decreases from the outer edge of the filter section toward the first filter hole along the radial direction of the filter section. Since the wide convex ridge near the edge can disperse the impact force of the water flow, while the narrow convex ridge near the center enhances the concentration of the water flow, a gradient guiding effect is formed, which is suitable for flow rate control under different water injection intensities.

[0014] In one specific embodiment, the upper surface of the protruding ridge is an arc-shaped surface.

[0015] In one specific embodiment, the radius of the first filter pore is 9 mm-9.5 mm, and the radius of the second filter pore is 1 mm-1.5 mm. During rapid extraction, the first filter pore can achieve a fast flow rate of approximately 1.5 g / s (suitable for dark roast beans), while the second filter pore corresponds to a slow flow rate of 0.7 g / s (suitable for light roast beans), matching mainstream extraction parameters in the industry. During slow extraction, the pore size of the second filter pore (1 mm-1.5 mm) also makes it easier for the coffee liquid to form a liquid film on the surface of the second filter pore.

[0016] In one specific embodiment, the width of the strip-shaped protrusion gradually decreases from top to bottom along the height direction of the cup body.

[0017] In one specific embodiment, the top of the strip-shaped protrusion is provided with a guide slope.

[0018] In one specific embodiment, a handle is provided on the outer surface of the cup body, a base is provided at the bottom of the cup body, and a plurality of support members are provided on the lower surface of the base along the circumference of the cup body.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1) The coffee filter cup of this utility model can flexibly switch between fast rinsing and slow steeping modes through the combination of the first filter hole and the second filter hole, covering the extraction of all flavors from refreshing fruit acidity to rich bitter sweetness, and meeting the needs of users for multiple extraction methods.

[0021] 2) The strip-shaped protrusions on the inner wall of the coffee filter cup of this utility model and the convex ridges of the filter part form a continuous flow channel, avoiding over-extraction or under-extraction caused by local water flow concentration, so that the coffee liquid can penetrate evenly in the coffee bed. The inclined surface of the filter part guides the coffee liquid to converge towards the center, and the arc-shaped surface of the convex ridge reduces flow resistance. Together, they promote the even distribution of coffee liquid in the filter part, and enhance the sweetness and body.

[0022] 3) The guide slope and width gradient design of the strip-shaped protrusions of the coffee filter cup of this utility model help the platform-shaped filter paper fit tightly against the cup wall, reduce air bubble residue, and prevent unextracted water from bypassing. Attached Figure Description

[0023] Figure 1 This is an isometric structural diagram of the coffee filter cup of this utility model;

[0024] Figure 2 This is a top view of the coffee filter cup of this utility model;

[0025] Figure 3 This is a front-view sectional view of the coffee filter cup of this utility model;

[0026] Figure 4 This is an isometric sectional view of the coffee filter cup of this utility model.

[0027] In the diagram: 1-Cup body; 11-Internal space; 12-Strip protrusion; 121-Guide slope; 13-Flow channel; 2-Base; 21-Support; 3-Filter section; 31-First filter hole; 32-Protruding ridge; 33-Second filter hole; 34-Fan-shaped area; 4-Handle. Detailed Implementation

[0028] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0029] like Figures 1-4As shown, the coffee filter cup in this embodiment includes a cup body 1 and a base 2 disposed at the bottom of the cup body 1. The cup body 1 has an internal space 11 for accommodating filter paper, and the cross-sectional area of ​​the internal space 11 gradually decreases in the downward direction (the downward direction refers to the direction from the cup mouth to the cup bottom). The diameter of the cup mouth is larger than the diameter of the cup bottom. A plurality of strip-shaped protrusions 12 are provided on the inner surface of the internal space 11, distributed circumferentially along the cup body 1. The width of the strip-shaped protrusions 12 gradually decreases from top to bottom along the height direction of the cup body 1, and a guide slope 121 is provided on the top of the strip-shaped protrusions 12. In this embodiment, there are 22 strip-shaped protrusions 12, which are evenly arranged circumferentially along the cup body. This can match the size of most coffee filter papers on the market, allowing the filter paper to fit the filter cup more closely, avoiding or minimizing the situation where brewed water falls into the sharing pot without passing through the coffee grounds, thereby affecting the taste of the coffee. The outer surface of the cup body 1 is provided with a handle 4, and a plurality of support members 21 arranged around the cup body 1 are provided on the lower surface of the base 2.

[0030] The cross-section of the internal space 11 of the cup body 1 gradually decreases from top to bottom, matching the longitudinal expansion characteristics of the platform filter paper after it gets wet, enhancing the bottom seal and reducing bypass water that has not passed through the coffee grounds; 22 strip-shaped protrusions 12 evenly distributed around the circumference, together with the guide slope 121 at the top and the "wider at the top and narrower at the bottom" width gradient design, can guide the platform filter paper to fit tightly against the inner wall of the cup, reducing the gap between the filter paper and the cup wall, preventing brewing water from dripping directly from the gaps into the sharing pot without passing through the coffee grounds, ensuring that the water flow and coffee grounds are in full contact, reducing the problem of under-extraction, and thus stabilizing the coffee taste.

[0031] like Figure 2 , Figure 3 , Figure 4 As shown, a filter section 3 is provided on the lower side of the internal space 11, and a first filter hole 31 is opened in the middle of the filter section 3; the upper surface of the filter section 3 is formed with an inclined surface that slopes from the outer edge of the filter section 3 toward the first filter hole 31.

[0032] Therefore, the inclined surface of the upper surface of the filter section 3, which slopes from the outer edge towards the first filter hole 31, can actively guide the coffee liquid to flow towards the center of the first filter hole 31, preventing the coffee liquid from lingering at the edge of the filter section, reducing coffee liquid residue, ensuring that the coffee liquid is fully discharged through the filter hole, and improving extraction efficiency. In this embodiment, the cross-section of the filter section 3 is an inverted cone shape with a higher top and a lower bottom.

[0033] A plurality of protruding ridges 32 are arranged circumferentially around the first filter hole 31 on the filter section 3, and each protruding ridge 32 extends along the radial direction of the first filter hole 31; a flow channel 13 is formed between two adjacent strip-shaped protrusions 12 to allow coffee liquid to flow into the filter section 3, and a fan-shaped area 34 is formed between two adjacent protruding ridges 32 that communicates with the lower extension path of the flow channel 13, thereby forming a continuous flow channel. In order to make the protruding ridges 32 have a better flow guiding effect, the width of the protruding ridges 32 gradually decreases from the outer edge of the filter section 3 toward the first filter hole 31 along the radial direction of the filter section 3, and the upper surface of the protruding ridges 32 is an arc-shaped surface.

[0034] Therefore, the guide groove 13 between the strip-shaped protrusions 12 on the inner wall of the cup body 1 and the fan-shaped area between the protrusions 32 of the filter section 3 are "connected by an extended path", forming a continuous guide channel from the upper part of the cup body 1 to the filter section 3. This ensures that the coffee liquid flows unimpeded from the top to the filter section, avoiding local water flow blockage or stagnation and reducing extraction dead zones. The "wide on the outside and narrow on the inside" design of the protrusions 32, with a wider outer edge and a narrower edge near the first filter hole 31, disperses the water flow impact force at the outer end and enhances the concentration of water flow towards the center at the inner end, adapting to water flow control under different pouring pressures. The arc-shaped surface of the upper surface of the protrusions 32 reduces the frictional resistance between the water flow and the protrusions, avoiding turbulence and allowing the coffee liquid to flow stably in a laminar state, improving extraction stability. Because the surface of the filter section 3 is provided with protrusions 32, there is space between the bottom of the filter paper and the surface of the filter section 3 for the coffee liquid to flow. The protrusions 32 also guide the flow of the coffee liquid, increasing its fluidity.

[0035] The filter section 3 has a plurality of second filter holes 33 arranged circumferentially along the first filter hole 31, and the radius of the second filter holes 33 is smaller than the radius of the first filter hole 31; each fan-shaped region 34 has a plurality of second filter holes 33 arranged radially along the first filter hole 31. In this embodiment, the radius of the first filter hole 31 is 9 mm or 9.5 mm, and the radius of the second filter hole 33 is 1 mm or 1.5 mm.

[0036] The first filter hole 31 has a larger diameter, which can achieve rapid extraction with a large water flow, such as the quick rinsing required for dark roast coffee beans; the second filter hole 33 has a smaller diameter, which is suitable for slow extraction with a small water flow, such as the thorough soaking required for light roast coffee beans. The combination of the two hole diameters covers different extraction scenarios and solves the problem of the single form of liquid outlet hole in existing filter cups. Because the filter section of this invention is equipped with two different sized first filter holes 31 and second filter holes 33, after the coffee liquid flows downward into the filter section, it will first pass through the smaller radius second filter hole 33. If the user uses a slow extraction method with a small water flow, the coffee liquid with a slower flow rate will form a liquid film on the surface of the second filter hole 33 due to the surface tension of the liquid, and will not be filtered out in the second filter hole 33. As a result, the coffee liquid will continue to flow towards the first filter hole 31 in the middle, increasing the time that the coffee liquid stays in the filter cup, making the coffee liquid have a better sweetness and body. Conversely, when the user chooses a large water flow extraction, because the coffee liquid flows into the filter section at a fast flow rate, under the action of pressure, part of the coffee liquid will flow out when passing through the second filter hole 33, and the other part will flow out through the first filter hole 31 in the middle. The multi-channel coordinated operation significantly shortens the liquid retention time, retains volatile aroma substances, and highlights the fresh flavor of the coffee.

[0037] Based on the surface tension effect of liquids, water molecules form an inwardly contracting "elastic film" on the liquid surface, generating an inward resultant force at the edge of the micropores. When the pore radius is ≤1.5mm, the surface tension is sufficient to resist gravity, forming a temporary liquid film at the pore opening to prevent liquid seepage. The smaller the pore size, the greater the pressure difference required to resist gravity, and the easier it is for liquid to be retained. In addition, according to the capillary effect of liquids, the adsorption force of the liquid on the inner wall of the micropore causes the liquid to climb along the pore wall, forming a concave liquid surface, further increasing the resistance to the downward flow of liquid. The colloids and oils dissolved in coffee liquid increase the contact angle, enhancing the capillary effect.

[0038] Therefore, firstly, slow-flowing coffee liquid flows into the fan-shaped area 34, contacting the second filter pore 33 with a radius of 1-1.5 mm, and liquid quickly forms on the surface of the micropores. Subsequently, the surface tension of the coffee liquid resists gravity, and capillary action causes the liquid surface to concave, with the liquid temporarily stagnating on the surface of the filter section. Finally, the liquid film ruptures after accumulating to a critical thickness, or the liquid is diverted to the first filter pore 31 to flow out, achieving slow-release extraction under a small water flow, enhancing sweetness and body. However, when the water pressure exceeds the surface tension threshold, the liquid film cannot form, and the liquid directly penetrates the dual pores and flows out, achieving rapid extraction.

[0039] The coffee filter cup in this embodiment is a high-temperature ceramic piece, handcrafted in one piece. High-temperature ceramic has a very good specific heat capacity and better heat retention than other materials such as resin and stainless steel, which can ensure the stability of coffee extraction. At the same time, high-temperature ceramic has better corrosion resistance, making it safer, with high strength and not easy to scratch, and low water absorption, making it easy to clean and maintain hygiene. This application uses a more reasonable strip-shaped protrusion design on the cup wall to make the filter paper fit better. The filter part 3 at the bottom of the cup body 1 has first filter holes 31 and second filter holes 33 of different sizes. By controlling the brewing intensity, the speed of coffee water flow can be adjusted, allowing the coffee filter cup to have more diverse brewing methods to express different coffee flavors.

[0040] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the present invention by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

Claims

1. A coffee filter cup comprising a cup body (1), characterised in that: The cup body (1) has an internal space (11) for accommodating filter paper, and the cross-sectional area of ​​the internal space (11) gradually decreases in the downward direction. Several strip-shaped protrusions (12) are provided on the inner surface of the internal space (11) and distributed around the circumference of the cup body (1). A filter outlet (3) is provided on the lower side of the internal space (11), and a first filter hole (31) is opened in the middle of the filter outlet (3). Several protruding ridges (32) are provided around the first filter hole (31) on the filter outlet (3), and each protruding ridge (32) extends along the radial direction of the first filter hole (31). Several second filter holes (33) are provided around the first filter hole (31) on the filter outlet (3), and the radius of the second filter hole (33) is smaller than the radius of the first filter hole (31).

2. The coffee filter cup according to claim 1, characterized in that: The upper surface of the filter section (3) is formed with an inclined surface that slopes from the outer edge of the filter section (3) toward the first filter hole (31).

3. The coffee filter cup according to claim 1, characterized in that: A flow channel (13) is formed between two adjacent strip-shaped protrusions (12) to allow coffee liquid to flow to the filter section (3), and a fan-shaped area (34) is formed between two adjacent protrusions (32) that is connected to the lower extension path of the flow channel (13), thereby forming a continuous flow channel.

4. The coffee filter cup according to claim 3, characterized in that: Each of the fan-shaped regions (34) is provided with a plurality of second filter holes (33) arranged along the radial direction of the first filter hole (31).

5. The coffee filter cup according to claim 1, characterized in that: The width of the protruding ridge (32) gradually decreases from the outer edge of the filter portion (3) toward the first filter hole (31) along the radial direction of the filter portion (3).

6. The coffee filter cup according to claim 1, characterized in that: The upper surface of the protruding ridge (32) is an arc-shaped surface.

7. The coffee filter cup according to claim 1, characterized in that: The radius of the first filter hole (31) is 9 mm to 9.5 mm, and the radius of the second filter hole (33) is 1 mm to 1.5 mm.

8. The coffee filter cup according to claim 1, characterized in that: The width of the strip-shaped protrusion (12) gradually decreases from top to bottom along the height direction of the cup body (1).

9. The coffee filter cup according to claim 1, characterized in that: The top of the strip-shaped protrusion (12) is provided with a guide slope (121).

10. The coffee filter cup according to claim 1, characterized in that: A handle (4) is provided on the outer surface of the cup body (1).

11. The coffee filter cup according to any one of claims 1 to 10, characterized in that: The bottom of the cup body (1) is provided with a base (2), and a number of support members (21) are provided on the lower surface of the base (2) along the circumference of the cup body (1).

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