Filtering device and coffee preparation equipment thereof

Abstract

The utility model provides a filtering device and coffee preparation equipment comprising the filtering device. The filtering device comprises a filtering net groove (106), the side wall of the filtering net groove (106) is closed, and a liquid outlet hole is formed in the bottom of the filtering net groove (106) so that liquid in the filtering device can flow out of the filtering net groove (106); the first filter screen (1042) is detachably arranged in the filter screen groove (106); the first filter screen (1042) is detachably arranged in the filter screen groove (106), the second filter screen (1044) is detachably arranged in the filter screen groove (106), and the opening area of the first filter screen (1042) is larger than the opening area of the second filter screen (1044), so that the flowing-out speed of liquid in the filter device in the hot extraction mode is larger than the flowing-out speed of liquid in the filter device in the cold extraction mode.

Description

Technical Field

[0001] This disclosure relates to the field of kitchen appliances, and more specifically, to a filtration device and a coffee preparation apparatus including the filtration device. Background Technology

[0002] There are many drip coffee machines on the market, but they have certain limitations in terms of functionality. Most drip coffee machines can only perform hot brewing. Specifically, coffee beans are first ground into a fine powder in the grinding chamber, and then this coffee powder enters the filter chamber. Next, a stream of hot water is used to quickly extract the coffee powder, thus obtaining hot coffee. Because hot brewing has special requirements for extraction, these types of hot brew coffee machines often have many large air vents in the filter.

[0003] As living standards improve, consumers' demands for brewed coffee are also increasing. Cold brew coffee is a method of extraction that involves steeping coffee grounds in cold water for an extended period. Compared to traditional hot brew coffee, cold brew typically has a smoother texture, lower acidity, and milder bitterness, making it popular among coffee lovers. However, in the cold brew mode of the aforementioned hot brew coffee machines, the excessive pores in the filter cause water to flow out too quickly, preventing sufficient contact between the water and coffee grounds. This results in insufficient steeping time and a less concentrated cold brew, thus failing to achieve the desired cold brew coffee concentration. To meet consumer needs, a few coffee machines now combine cold and hot brew functions. For example, Chinese patent CN220898463U uses a water pump to circulate water between the water tank and the coffee grounds container, thereby quickly extracting coffee grounds and reducing the time required for cold brew. However, the design also has its shortcomings. For example, it does not take into account the improvement of the filter screen. Therefore, in order to control the flow of coffee liquid, a liquid outlet valve needs to be installed at the outlet, which increases the manufacturing cost. Utility Model Content

[0004] This disclosure is provided to introduce, in a simplified form, some concepts that will be further described in the following detailed description. This disclosure is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0005] One of the purposes of this disclosure is to provide a filtration device and coffee preparation equipment, which adjusts the water flow and coffee powder steeping time by changing the filter screen area, thereby integrating the two methods of hot and cold brewing coffee, allowing for switching between hot and cold brewing, and enabling multiple coffee liquid concentrations to be varied to meet different user needs.

[0006] According to one aspect of this disclosure, a filtration device for a coffee preparation apparatus is provided, comprising: a filter screen groove with sealed sidewalls and a liquid outlet at the bottom for liquid outflow within the filtration device; a first filter screen detachably disposed within the filter screen groove; and a second filter screen detachably disposed within the filter screen groove, wherein the opening area of ​​the first filter screen is larger than that of the second filter screen, such that the liquid outflow rate within the filtration device is greater in hot brew mode than in cold brew mode. This design achieves switching between hot and cold extraction by changing the filter screen structure of the coffee preparation apparatus to obtain different steeping times for coffee powder.

[0007] According to one embodiment of this disclosure, a first filter screen is disposed in a filter screen groove for the hot extraction mode; and for the cold extraction mode, both a first filter screen and a second filter screen are disposed in superimposed in the filter screen groove. This design achieves the switching between hot and cold extraction modes by using a filter screen with a larger opening area in the hot extraction mode and superimposing filters with different opening areas in the cold extraction mode.

[0008] According to another embodiment of this disclosure, a first filter screen is disposed in the filter screen groove for the hot extraction mode; and a second filter screen is disposed in the filter screen groove alternatively for the cold extraction mode. This design achieves the switching between the hot and cold extraction modes by alternately using a filter screen with a larger opening area in the hot extraction mode and a filter screen with a smaller opening area in the cold extraction mode.

[0009] According to another embodiment of this disclosure, the opening area of ​​the first filter is set to be greater than 50% of the total surface area of ​​the first filter; and the opening area of ​​the second filter is set to be between 1% and 30% of the total surface area of ​​the second filter. This design achieves coffee brewing in both hot and cold brew modes by further limiting the difference in opening areas between the different filters.

[0010] According to another embodiment of this disclosure, one or more openings are provided at a position no higher than 1 / 3 of the sidewall of the second filter. This design further defines the position of the openings in the filter used in cold brew mode, so that the coffee in the filter must sink to the bottom to be filtered out through the openings, thereby slowing down the flow of coffee through the limited opening area and position, resulting in better saturation during cold brew mode.

[0011] According to a further embodiment of this disclosure, one or more overflow prevention holes are provided on the upper part of the sidewall of the second filter. This design further provides overflow prevention holes on the upper part of the filter used in cold extraction mode to prevent liquid from overflowing from the second filter.

[0012] According to another aspect of this disclosure, a coffee preparation apparatus is provided, comprising: a liquid supply device for supplying liquid for brewing coffee; a heating device for heating the liquid supplied by the liquid supply device so that the temperature of the liquid in hot brewing mode is higher than that in cold brewing mode; and a filtration device according to this disclosure. This design employs the filtration device of this disclosure, achieving switching between hot and cold extraction by changing the filter structure of the coffee preparation apparatus to obtain different steeping times for the coffee powder.

[0013] According to one embodiment of this disclosure, the liquid supply device includes a water pump configured to have multiple on / off ratios, thereby adjusting multiple liquid discharge rates through different on / off ratios. The design further adjusts different water supply rates by controlling the on / off state of the water pump.

[0014] According to another embodiment of this disclosure, the heating device is configured to have multiple operating powers to heat the liquid supplied by the liquid supply device to a first plurality of temperatures corresponding to a hot brewing mode and a second plurality of temperatures corresponding to a cold brewing mode, wherein the first plurality of temperatures are higher than the second plurality of temperatures. This design further controls different steeping effects by adjusting different water temperatures, achieving different coffee concentrations in both hot and cold brewing modes.

[0015] According to a further embodiment of this disclosure, a first plurality of temperatures are between 80-100°C, and a second plurality of temperatures are between 0-55°C. This design further defines the water temperature difference during hot and cold brew modes to accommodate different filters for coffee brewing.

[0016] These and other features and advantages will become apparent from the following detailed description and with reference to the accompanying drawings. It should be understood that the foregoing general description and the following detailed description are illustrative only and do not limit the scope of the claims. Attached Figure Description

[0017] To gain a more detailed understanding of the manner in which the features of this disclosure are described above, reference can be made to the various embodiments for a more specific description of the above-briefly summarized aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as this description may allow for other equivalent and effective aspects.

[0018] Figure 1 A side view of the internal structure of a coffee preparation apparatus according to an embodiment of the present disclosure is shown.

[0019] Figure 2 A side view of the internal structure of the filtration apparatus in thermal extraction mode according to an embodiment of the present disclosure is shown.

[0020] Figure 3a A side view of the internal structure of the filtration apparatus in cold extraction mode according to an embodiment of the present disclosure is shown.

[0021] Figure 3b A side view of the internal structure of the filtration apparatus in cold extraction mode according to another embodiment of the present disclosure is shown.

[0022] Figure 4a A top view of the internal structure of the filtration apparatus in cold extraction mode according to an embodiment of the present disclosure is shown.

[0023] Figure 4b A top view of the internal structure of the filtration apparatus in cold extraction mode according to another embodiment of the present disclosure is shown.

[0024] Explanation of reference numerals in the attached figures:

[0025] 102 Grinding chamber; 104 Filter screen; 106 Filter screen groove; 108 Coffee cup; 110 Filtration device; 112 Liquid supply device; 114 Heating device; 116 Temperature sensor.

[0026] 1042 First filter screen; 1044 Second filter screen; 1052 Opening; 1054 Overflow prevention hole. Detailed Implementation

[0027] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0028] In the description of this disclosure, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0029] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this disclosure. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0032] Figure 1 This is a side view of the internal structure of a coffee preparation apparatus according to an embodiment of the present disclosure. The coffee preparation apparatus can perform both hot and cold brew coffee preparation functions.

[0033] like Figure 1 As shown, the beverage preparation equipment may include a liquid supply device 112, a heating device 114, and a filtering device 110. The liquid supply device 112 provides liquid (e.g., water) for brewing coffee, and the heating device 114 heats the liquid supplied by the liquid supply device 112 so that the temperature of the liquid in hot brew mode is higher than that in cold brew mode. The filtering device 110 may include a filter screen 104 and a filter screen tank 106.

[0034] Furthermore, for Figure 1 The filter device 110 may include two or more filter screens 104, and the two or more filter screens 104 are detachably disposed in the filter screen groove 106, so as to facilitate the placement of the appropriate filter screen 104 in the filter screen groove 106 according to actual needs, and to facilitate the cleaning of each device.

[0035] The following will combine Figures 2 to 4bThe filtration device of this disclosure will now be described in detail. The filtration device may include a filter screen trough 106, a first filter screen 1042, and a second filter screen 1044, with the first and second filter screens 1042 and 1044 detachably disposed within the filter screen trough 106. The filter screen trough 106 has sealed sidewalls and a liquid outlet at its bottom for the outflow of liquid from the filtration device. Further, the opening area of ​​the first filter screen 1042 is larger than that of the second filter screen 1044, so that the outflow rate of liquid from the filtration device in hot extraction mode is greater than that in cold extraction mode. It will be understood that more filter screens, with different opening areas, can be provided as needed.

[0036] In one example, corresponding to the hot extraction mode, a first filter 1042 can be provided in the filter tank 106, and corresponding to the cold extraction mode, both the first filter 1042 and the second filter 1044 can be superimposed in the filter tank 106.

[0037] In another example, corresponding to the hot extraction mode, a first filter 1042 may be provided in the filter tank 106, and corresponding to the cold extraction mode, a second filter 1044 may be provided in the filter tank 106.

[0038] Specifically, Figure 2 This is a side view of the internal structure of the filtration device in hot extraction mode according to an embodiment of the present disclosure. Figure 2 As shown, in hot brewing mode, a first filter screen 1042 with a larger opening area can be placed in the filter screen tank 106. At this time, heated liquid or high-temperature steam enters the first filter screen 1042 through the upper opening of the filter device, dissolving the coffee powder within. Figure 2 The grid pattern is used to represent the coffee grounds, but it's easy to understand. Figure 2 The height of the coffee powder shown is merely exemplary; more or less coffee powder can be added as needed. The powder then passes through the opening of the first filter screen 1042, flows along the inner wall of the filter screen groove 106 to the outlet hole at the bottom of the filter screen groove 106, and is discharged. Figure 2 The arrow in the image indicates the direction.

[0039] Figure 3a and Figure 4a These are, respectively, a side view and a top view of the internal structure of the filtration device in cold extraction mode according to an embodiment of this disclosure. Similarly, Figure 3a The grid pattern is used to represent the coffee grounds, but it's easy to understand. Figure 3a The height of the coffee powder shown is merely exemplary; more or less coffee powder can be added as needed. In this embodiment, a cold brew mode is achieved by stacking different filters. Figure 3a and Figure 4aAs shown, in cold extraction mode, a first filter 1042 and a second filter 1044 can be stacked within the filter tray 106, wherein the opening area of ​​the second filter 1044 is smaller than the opening area of ​​the first filter 1042. For ease of explanation, in... Figure 3a and Figure 4a In this process, the second filter 1044 is placed inside the first filter 1042, but it is also possible to place the first filter 1042 inside the second filter 1044. At this time, the liquid used for brewing coffee is not heated or is only slightly heated, and enters the first filter 1042 and the second filter 1044 from the top opening of the filter device. Because the second filter 1044 has a small opening area after being placed inside, the liquid can fully contact and soak the coffee powder in the filter device, and then the coffee liquid is filtered out through the opening of the first filter 1042 and the second filter 1044 stacked together, and then flows along the inner wall of the filter screen groove 106 to the liquid outlet at the bottom of the filter screen groove 106 for discharge.

[0040] Figure 3b and Figure 4b These are, respectively, a side view and a top view of the internal structure of the filtration device in cold brew mode according to another embodiment of this disclosure. Similarly, Figure 3b The grid pattern is used to represent the coffee grounds, but it's easy to understand. Figure 3b The height of the coffee powder shown is merely exemplary; more or less coffee powder can be added as needed. In this embodiment, the cold brew mode is achieved by alternatively using a filter with a smaller opening area. Figure 3b and Figure 4b As shown, in cold brew mode, a second filter 1044 can be replacedly placed in the filter tray 106, wherein the opening area of ​​the second filter 1044 is smaller than that of the first filter 1042. At this time, the liquid used for brewing coffee is not heated or is only slightly heated, and enters the second filter 1044 from the top opening of the filter device. Similarly, because the second filter 1044 has a smaller opening area, the liquid can fully contact and soak the coffee powder in the filter device before producing coffee liquid which is filtered out through the opening of the second filter 1044 and then flows along the inner wall of the filter tray 106 to the outlet hole at the bottom of the filter tray 106 for discharge.

[0041] The above explanation details the different placement methods of the filters within the filtration device during hot and cold brew modes. The structure of the filters within the filtration device will be further described below. For example, each of two or more filters 104 (including the first filter 1042 and the second filter 1044) has a filter membrane attached to its opening portion. This filter membrane allows only water and water vapor to pass through, preventing coffee grounds from falling off. Accordingly, filters 104 with different opening areas can be configured by adjusting the number and size of the openings in each filter 104. Furthermore, these filters 104 can be cleaned for reuse.

[0042] In one example, the opening area of ​​the first filter 1042 can be set to be greater than 50% of its total surface area, and the opening area of ​​the second filter 1044 can be set to be between 1% and 30% of its total surface area. Thus, by limiting the difference in opening areas between the first and second filters 1042, coffee brewing in both hot and cold brew modes can be better achieved.

[0043] In another example, such as Figures 3a to 4b As shown, for the second filter 1044 used in cold brew mode, one or more openings 1052 can be provided on its side wall at a distance not exceeding 1 / 3. The openings 1052 on the lower side wall of the second filter 1044 allow the liquid and coffee powder ( Figure 3a and Figure 3b After the coffee powder (represented by a grid pattern) is mixed, it needs to slowly settle to the openings below to be filtered out. This, through the limited opening area and position, slows down the flow of coffee, prolonging the extraction time and resulting in better saturation during cold brew. Therefore, it can be understood that the opening at no more than 1 / 3 of the side wall of the second filter 1044 is merely exemplary; in practice, the opening position of the second filter 1044 can be adjusted according to the height of the coffee powder. In a further non-limiting embodiment, one or more overflow holes 1054 can also be provided on the upper part of the side wall of the second filter 1044. This design prevents liquid from overflowing from the upper edge of the second filter 1044.

[0044] In conjunction with the filtration device described above, refer to the following... Figure 1 The following will further describe a coffee preparation apparatus that includes the filtration device described in this disclosure.

[0045] In one example, the coffee preparation apparatus may further include a detection device (not shown). The detection device may be configured to activate the hot brew mode when only the first filter 1042 is detected in the filter compartment 106, and to activate the cold brew mode when a second filter 1044 is detected in the filter compartment 106 (including both the first and second filters 1042). This design automatically activates the hot or cold brew mode by detecting the filter placed in the filter device 110, eliminating the need for manual settings and making it more convenient to use.

[0046] In another example, the liquid supply device 112 in the coffee preparation apparatus can be configured to adjust multiple dispensing rates so that the liquid in the filter device 110 has corresponding multiple outflow rates during cold brew mode. This design can adjust different water supply rates through the liquid supply device 112, thereby further controlling different steeping times within the filter device 110 to achieve different coffee concentrations in cold brew mode. In a further non-limiting embodiment, the liquid supply device 112 may include a water pump, which can be configured to have multiple on / off ratios, thereby adjusting multiple dispensing rates through different on / off ratios. That is, different water supply rates can be adjusted by controlling the on / off state of the water pump.

[0047] In another example, the heating device 114 in the coffee preparation apparatus can be configured to have multiple operating powers to heat the liquid supplied by the liquid supply device 112 to a first plurality of temperatures corresponding to a hot brewing mode and a second plurality of temperatures corresponding to a cold brewing mode, wherein the first plurality of temperatures are higher than the second plurality of temperatures. Considering that higher water temperatures lead to faster dissolution, this design controls different steeping effects by adjusting different water temperatures, thereby further achieving different coffee concentrations in both hot and cold brewing modes.

[0048] In a further non-limiting embodiment, the first plurality of temperatures may be between 80-100°C, and the second plurality of temperatures may be between 0-55°C. This design further defines the water temperature difference during the hot and cold brew modes, thereby better accommodating different filters to achieve coffee brewing.

[0049] In a further non-limiting embodiment, corresponding to a first plurality of temperatures, the opening area of ​​the first filter 1042 can be set such that the beverage concentration produced by the filtering device 110 is between 1.1% and 3%, and corresponding to a second plurality of temperatures, the opening area of ​​the second filter 1044 can be set such that the beverage concentration produced by the filtering device 110 is between 0.5% and 1.1%. This design achieves different coffee concentrations in both hot and cold brew modes by setting appropriate opening areas for different filters.

[0050] In another example, the concentration of coffee produced by the filter device 110 can be at least inversely proportional to the opening area of ​​the filter screen 104 (including the first filter screen 1042 and / or the second filter screen 1044), inversely proportional to the dispensing rate of the liquid supply device 112, directly proportional to the temperature of the liquid inside the filter device 110, or any combination thereof. That is, different coffee concentrations can be adjusted by combining the opening area of ​​the filter screen, the water flow rate inside the filter screen, and the water temperature inside the filter screen.

[0051] In a further non-limiting embodiment, the coffee preparation apparatus may further include an instruction receiving device for receiving instructions from a user regarding the preparation of coffee of different strengths in either hot or cold brew mode. This configuration may further provide a user selection interface, offering the user more options.

[0052] As you can understand, the examples above can be applied individually or in combination. For instance, the concentration of coffee can be adjusted by changing the pore area of ​​the filter, the water flow rate (such as the outflow rate), and / or the temperature. Furthermore, the setting of the filter's pore area, or which pore area of ​​the filter is used, can also be adjusted based on the water flow rate and / or temperature. Accordingly, it's even possible to use only one filter (with an pore area that can be set to be compatible with the intermediate values ​​of hot and cold brew modes) and simply change the water flow rate to switch between hot and cold brew modes, such as using a high flow rate in hot brew mode and a low flow rate in cold brew mode.

[0053] The above describes the coffee preparation equipment disclosed herein. The following section will use a grinder-type coffee machine as an example to describe the entire coffee preparation process in detail. Figure 1 As shown, the coffee preparation equipment may further include a grinding chamber 102 for grinding coffee beans into powder and then feeding them into a filter device 110.

[0054] The filter 104 can be placed in the filter tray 106, and the coffee powder also enters the interior of the filter 104. For ease of explanation, two filters are used as an example: the filter 104 can include both a hot brew filter (i.e., the first filter 1042) and a cold brew filter (i.e., the second filter 1044), and the opening area of ​​the hot brew filter is larger than that of the cold brew filter. It can be understood that more filters with different opening areas can be used as needed.

[0055] The hot brew filter has one or more openings, each covered with a filter membrane that allows only water and steam to pass through, preventing coffee grounds from falling out. The opening area of ​​the hot brew filter accounts for more than 50% of its total area.

[0056] The cold brew filter can have perforations on its side walls and bottom. Specifically, perforations on the bottom allow for smoother water flow, thus requiring a smaller perforation area; while perforations on the side walls obstruct water flow at the bottom, allowing for a larger perforation area. Perforations can also be made on both the bottom and side walls simultaneously, with the perforation area adjusted according to desired results. Additionally, each perforation is fitted with a filter membrane that allows only water and steam to pass through, preventing coffee grounds from falling out. The perforated area of ​​the cold brew filter accounts for 1%-30% of its total area.

[0057] Furthermore, a channel may be provided below the filter slot 106 to communicate with the coffee cup 108.

[0058] refer to Figure 2 In hot brew mode: The hot brew filter is placed in the filter basket 106. The coffee powder produced by the coffee machine after grinding in the grinding chamber 102 falls into the hot brew filter. At the same time, hot water is generated inside the coffee machine. The temperature of the hot water can be between 80-100℃. It enters the hot brew filter and fully extracts coffee powder. The resulting coffee liquid enters the filter basket 106 through the opening of the hot brew filter, and then flows into the coffee cup 108 through the channel below the filter basket 106 to produce hot brewed coffee. The coffee concentration can be 1.1-3%.

[0059] In cold brew mode, two methods can be used: stacking two filters (cold brew method 1) and replacing them (cold brew method 2). In this mode, the water inside the coffee machine can be left unheated or only slightly heated, maintaining a water temperature between 0-55℃. For example, without heating, the water temperature can be room temperature, such as 20℃ or 25℃; alternatively, the water can be slightly heated as needed, such as to 40℃ or 50℃.

[0060] refer to Figure 3a and Figure 4a In the cold brew scheme 1, the cold brew filter is placed inside the hot brew filter, and the two filters are then stacked and placed in the filter tray 106. The coffee grounds produced by the coffee machine fall into the cold brew filter. At the same time, the water inside the coffee machine is not heated or is only slightly heated, and enters the cold brew filter. Because the cold brew filter has a small opening area, the water will not flow out quickly, but can fully soak with the coffee grounds (the soaking time can be, for example, 6-15 minutes). After being fully in contact with the coffee grounds, the coffee liquid produced enters the filter tray 106 through the opening of the stacked cold brew and hot brew filters, and then flows into the coffee cup 108 through the channel below the filter tray 106 to produce cold brew coffee. The coffee concentration obtained is 0.5-1.1%.

[0061] refer to Figure 3b and Figure 4b In the cold brew scheme 2, the cold brew filter is placed directly into the filter slot 106. When switching between cold and hot brew modes, the filter opening area is changed by switching between the cold brew filter and the hot brew filter. After the cold brew filter is placed in, the coffee liquid can only flow out through the openings at the bottom and / or side walls of the cold brew filter, so as to achieve full contact and soaking of coffee and water.

[0062] Furthermore, the water flow rate can be controlled by switching the water pump in the liquid supply device 112 on and off. For example, if the water pump is set to continuously supply water, the water flow rate is the fastest, while if the water pump is set to run for 10 seconds and then stop for 1 second, the water flow rate will be slower. Correspondingly, if the on / off ratio of the water pump is set to be smaller, the water flow rate will be even slower.

[0063] Alternatively, the water temperature can be adjusted using the heating device 114. For example, a temperature sensor 116 can also be attached to the heating device 114. The temperature sensor 116 is used to detect changes in water temperature or steam temperature, thereby controlling the operation of the heating device 114 to achieve changes in water temperature.

[0064] Based on the above methods, the following formula for the concentration of coffee liquid can be derived:

[0065] N = k * T / (S * V)

[0066] Where N is the concentration of the coffee liquid, k is a coefficient, T is the water temperature, S is the pore area of ​​the filter, and V is the water flow rate from the pump. It can be seen that the concentration of the coffee liquid is inversely proportional to S and V, and directly proportional to T. By adjusting these parameters, different concentrations of hot and cold brew coffee can be obtained, providing users with more choices.

[0067] It is understood that the coffee preparation equipment disclosed herein encompasses various types and is not limited to the grinder-type coffee machines described above. In fact, it may also include types such as drip coffee machines without a grinding function. Regardless of the type, these coffee preparation devices can switch between hot and cold brew modes by altering certain factors, primarily the filter's pore area and water flow rate. Specifically, in hot brew mode, the filter's pore area is larger, and the water flow rate is faster, resulting in a shorter steeping time for coffee grounds and water, thus quickly producing hot coffee. In cold brew mode, the filter's pore area is smaller, and the water flow rate is slower, resulting in a longer steeping time for coffee grounds and water, thus producing cold brew coffee. Correspondingly, such coffee preparation equipment offers numerous advantages, such as lower cost, faster dispensing speed, and continuous dispensing. These advantages allow it to well meet the needs of different users, satisfying both those seeking efficiency and convenience and those with specific requirements for coffee flavor.

[0068] The foregoing description includes examples of various aspects of the claimed subject matter. It is certainly impossible to describe every conceivable combination of components or methods for the purpose of depicting the claimed subject matter, but those skilled in the art will recognize that many further combinations and arrangements of the claimed subject matter are possible. Thus, the disclosed subject matter is intended to cover all such changes, modifications, and variations that fall within the spirit and scope of the appended claims.

Claims

1. A filtration device for coffee preparation equipment, characterized in that, The filtration device includes: The filter screen groove (106) has a sealed side wall and a liquid outlet hole at the bottom for the liquid to flow out of the filter device. A first filter screen (1042) detachably disposed within the filter screen groove (106); and A second filter (1044) is detachably disposed within the filter groove (106). The opening area of ​​the first filter screen (1042) is larger than that of the second filter screen (1044), so that the outflow rate of the liquid in the filter device in the hot extraction mode is greater than that in the cold extraction mode.

2. The filtration device as described in claim 1, characterized in that, Corresponding to the hot extraction mode, the first filter (1042) is disposed in the filter groove (106); and Corresponding to the cold extraction mode, the first filter (1042) and the second filter (1044) are stacked in the filter groove (106).

3. The filtration device as described in claim 1, characterized in that, Corresponding to the hot extraction mode, the first filter (1042) is disposed in the filter groove (106); and Corresponding to the cold extraction mode, the second filter (1044) is alternatively disposed in the filter groove (106).

4. The filtration device as described in claim 1, characterized in that, The opening area of ​​the first filter screen (1042) is set to be greater than 50% of the total surface area of ​​the first filter screen (1042); and The opening area of ​​the second filter (1044) is set to be between 1% and 30% of the total surface area of ​​the second filter (1044).

5. The filtration device as claimed in claim 1, characterized in that, One or more openings (1052) are provided at a position no higher than 1 / 3 of the side wall of the second filter screen (1044).

6. The filtration device as described in claim 5, characterized in that, One or more overflow holes (1054) are provided on the upper part of the side wall of the second filter (1044).

7. A coffee preparation device, characterized in that, The coffee preparation equipment includes: Liquid supply device (112) for supplying liquid for brewing coffee; A heating device (114) for heating the liquid supplied by the liquid supply device (112) such that the temperature of the liquid in the hot extraction mode is higher than the temperature of the liquid in the cold extraction mode; and The filtration device (110) as described in any one of claims 1-6.

8. The coffee preparation apparatus as described in claim 7, characterized in that, The liquid supply device includes a water pump configured to have multiple on / off ratios, thereby adjusting multiple liquid discharge rates through different on / off ratios.

9. The coffee preparation apparatus as described in claim 7, characterized in that, The heating device is configured to have multiple operating powers to heat the liquid supplied by the liquid supply device to a first plurality of temperatures corresponding to the hot extraction mode and a second plurality of temperatures corresponding to the cold extraction mode, wherein the first plurality of temperatures are higher than the second plurality of temperatures.

10. The coffee preparation apparatus as described in claim 9, characterized in that, The first plurality of temperatures are between 80-100°C, and the second plurality of temperatures are between 0-55°C.

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