A cold brew coffee extraction device
By using an automated cold brew coffee extraction device and advanced extraction technology, utilizing a circulating gas heating and cooling water system to control the temperature, combined with weakly alkaline water extraction and a filter inner tank design, the problem of poor quality of cold brew coffee in existing technologies has been solved, and the production of high-quality cold brew coffee has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-14
AI Technical Summary
Existing cold brew coffee production equipment and processes are insufficient to produce high-quality cold brew coffee, resulting in poor taste.
It adopts an automated cold brew coffee extraction device, which controls the extraction temperature through a circulating gas heater and cooling water circulation system. Combined with weakly alkaline water extraction and filter inner tank design, it can efficiently extract the beneficial components in coffee and reduce bitterness and mineral content.
It has achieved the production of high-quality cold brew coffee with a bitter acid content of less than 20%, no more than 20 kinds of minerals, and preservation of coffee oil aroma, thus improving the taste and nutritional value of coffee.
Smart Images
Figure CN224483681U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cold brew coffee extraction technology, specifically to a cold brew coffee extraction device. Background Technology
[0002] Cold brew coffee is popular with consumers due to its excellent taste. However, current cold brew coffee production processes and equipment are too rudimentary, making it difficult to produce high-quality cold brew coffee. To improve the quality of cold brew coffee, automated extraction equipment and advanced extraction processes are adopted to extract high-quality cold brew coffee. After rapid testing and qualification, it is then bottled, providing equipment and technical support for high-quality cold brew coffee. Summary of the Invention
[0003] To address the above shortcomings, the present invention provides a cold brew coffee extraction device to solve the aforementioned technical problems.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A cold brew coffee extraction device includes an extraction cylinder with a detachable filter liner inside. A circulating gas pipeline is provided between the upper and lower parts of the extraction cylinder. A gas heater is provided on the circulating gas pipeline. A circulating water pipeline is also provided between the upper and lower parts of the extraction cylinder. A coolant layer is provided between the inner and outer walls of the extraction cylinder, and a cooling water circulation pipeline is provided between the upper and lower parts of the coolant layer. A cooling water circulation pump and a chiller are provided on the cooling water circulation pipeline for cooling the circulating cooling water in the cooling water circulation pipeline.
[0006] Optionally, a powder pressing cover can be detachably installed inside the extraction tank.
[0007] Optionally, a cooling water temperature sensor transmitter is also installed on the cooling water circulation pipeline.
[0008] Optionally, the circulating gas pipeline is equipped with a circulating gas temperature sensor transmitter and a heater temperature sensor transmitter. The circulating gas temperature sensor transmitter is located on the inlet side of the circulating gas pipeline; the heater temperature sensor transmitter is located on the outlet side of the circulating gas pipeline; the gas heater is located between the circulating gas temperature sensor transmitter and the heater temperature sensor transmitter; the outlet side of the circulating gas pipeline is connected to the circulating water pipeline via a T-junction A.
[0009] Optionally, a circulating water pump and a solenoid valve B are installed on the circulating water pipeline. An inlet pipe is also installed between the circulating water pump and the solenoid valve B. A weak alkaline generator, a solenoid valve A, and a flow transmitter are installed on the inlet pipe.
[0010] Optionally, a high-temperature solenoid valve D is installed on the circulating water pipeline, and the high-temperature solenoid valve D is located between the three-way valve A and the solenoid valve B.
[0011] Optionally, a finished coffee concentrate discharge pipe is further provided between the high-temperature solenoid valve D and the solenoid valve B; a solenoid valve C is provided on the finished coffee concentrate discharge pipe.
[0012] Optionally, the air inlet side of the circulating air pipeline is provided with a fan, a high-temperature solenoid valve F, and a cooling air inlet pipe; the cooling air inlet pipe is connected to the air inlet of the fan; and a solenoid valve G is provided on the cooling air inlet pipe.
[0013] Optionally, a cooling exhaust pipe is provided at the outlet end of the circulating air pipeline, and the cooling exhaust pipe is connected to the air outlet of the fan; a solenoid valve H is provided on the cooling exhaust pipe.
[0014] Optionally, a gap is reserved between the filter inner liner and the inner wall of the extraction cylinder, and the bottom center of the filter inner liner bulges upward.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] This invention utilizes a circulating high-temperature gas supply to rapidly melt and release the oils in coffee powder (granules) under high-temperature impact, creating micropores that allow for better and faster extraction of beneficial coffee components. After the coffee powder undergoes a secondary Maillard reaction within the extraction container, treated weakly alkaline water is injected through the top of the extraction device in a spray-like manner, suppressing the coffee's oily aroma within the extract. Simultaneously, the extract is maintained at a constant temperature of 4–12°C, ensuring that the IBU content in the cold-brewed coffee is below 20%, and the number of mineral types does not exceed 20 (coffee contains over 40 minerals; besides IBU, some of the bitterness comes from these minerals, most of which exist in large molecular form and are difficult to dissolve in water at low temperatures). The majority of these minerals are water-soluble at low temperatures and are also beneficial minerals that are easily absorbed by the body. This device enables the extraction of high-quality cold-brewed coffee with excellent results. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0018] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0020] In the description of this utility model, it should be noted that the terms "inner", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.
[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0022] A cold brew coffee extraction device, such as Figure 1 As shown, the system includes an extraction cylinder 1, within which a filter inner liner 4 is detachably installed. In this embodiment, a gap is provided between the filter inner liner 4 and the inner wall of the extraction cylinder 1 to facilitate airflow circulation. The bottom surface of the filter inner liner bulges upwards in the center. This structure facilitates airflow entering the bulging cavity from the bottom and then diffusing outwards. The airflow passes through the coffee powder inside the filter inner liner 4 and flows outwards, thus achieving airflow circulation. In this embodiment, a sealing ring 8 is provided between the top of the filter inner liner 4 and the inner wall of the extraction cylinder 1.
[0023] A circulating gas pipeline is provided between the upper and lower parts of the extraction cylinder 1. In this embodiment, the upper end of the circulating gas pipeline is the gas outlet, and the lower end is the gas inlet. The gas outlet is connected to the cylinder head 9 through a detachable connection structure. A gas heater is provided on the circulating gas pipeline. In this embodiment, a 160°C gas constant temperature heater 19 is used. A circulating water pipeline is also provided between the upper and lower parts of the extraction cylinder 1. In this embodiment, the upper end of the circulating water pipeline is the water outlet, and an extraction water nozzle 6 is provided on the water outlet. A coolant layer 2 is provided between the inner and outer walls of the extraction cylinder 1. An insulation layer 3 is provided on the outer side of the coolant layer 2. A cooling water circulation pipeline is provided between the upper and lower parts of the coolant layer 2. In this embodiment, the upper end of the cooling water circulation pipeline is the cooling water inlet 13. A cooling water circulation pump 12 and a cooler 10 are provided on the cooling water circulation pipeline. In this embodiment, the cooler 10 is a semiconductor cooler used to cool the circulating cooling water in the cooling water circulation pipeline. The cooling water circulation pipeline is also equipped with a cooling water temperature sensor transmitter 11 for measuring the temperature of the circulating cooling water.
[0024] Optionally, a detachable tamping cap 5 is provided inside the extraction cylinder. In this embodiment, it is a coffee powder tamping cap 5, characterized by a stainless steel circular mesh. Its function is to prevent overflow when the coffee powder volume is too large. In this embodiment, the filter screen is preferably made of 300-mesh stainless steel, which maintains a certain gap with the inner wall of the extraction cylinder, and the tamping cap 5 holds the coffee powder in place. During the operation of the high-temperature resistant micro fan, this reduces the upward movement of coffee powder and prevents blockage.
[0025] Optionally, the circulating gas pipeline is equipped with a circulating gas temperature sensor transmitter 20 and a heater temperature sensor transmitter 23. The circulating gas temperature sensor transmitter 20 is located at the inlet end of the circulating gas pipeline and is used to measure the temperature of the circulating gas flowing out of the extraction cylinder 1. The heater temperature sensor transmitter 23 is located at the outlet end of the circulating gas pipeline and is used to measure the temperature of the gas after it has been heated by the 160°C gas constant temperature heater 19. The gas heater is located between the circulating gas temperature sensor transmitter and the heater temperature sensor transmitter. The outlet end of the circulating gas pipeline is connected to the circulating water pipeline through a three-way valve A. A high-temperature solenoid valve E 24 is also provided on the circulating gas pipeline, and the high-temperature solenoid valve E 24 is located between the heater temperature sensor transmitter 23 and the three-way valve A.
[0026] Optionally, a circulating water pump 17 and a solenoid valve B18 are installed on the circulating water pipeline. An inlet pipe is also installed between the circulating water pump and the solenoid valve B. A weakly alkaline generator 14, a solenoid valve A15, and a flow transmitter 16 are installed on the inlet pipe. The function of the weakly alkaline generator 14 is to weakly alkalize the drinking water to obtain weakly alkaline water. The advantage of using weakly alkaline water as extraction water is that coffee itself is slightly acidic; after neutralization with weakly alkaline water, the acidity of the coffee is reduced. The inlet of the weakly alkaline generator 14 is the drinking water inlet 31.
[0027] Optionally, a high-temperature solenoid valve D 29 is installed on the circulating water pipeline, and the high-temperature solenoid valve D 29 is located between the three-way valve A and the solenoid valve B18.
[0028] Optionally, a finished coffee concentrate discharge pipe is also provided between the high-temperature solenoid valve D 29 and the solenoid valve B18; the finished coffee concentrate discharge pipe is provided with a solenoid valve C 30 and a secondary filter 32, preferably a 300-mesh filter in this embodiment, and the outer end of the finished coffee concentrate discharge pipe is the finished coffee concentrate discharge outlet 33.
[0029] Optionally, the air inlet side of the circulating air pipeline is provided with a fan, a high-temperature solenoid valve F 21, and a cooling air inlet pipe. In this embodiment, the fan is preferably a high-temperature resistant micro fan 22 with a power of 45W to generate sufficient air pressure to drive the airflow circulation. The cooling air inlet pipe is connected to the air inlet of the fan. In this embodiment, it is set between the high-temperature solenoid valve F 21 and the fan through a T-junction. The cooling air inlet pipe is also provided with a solenoid valve G 25, and the outer end of the solenoid valve G 25 is the heater cooling air inlet 27.
[0030] Optionally, a cooling exhaust pipe is provided at the outlet end of the circulating gas pipeline. The cooling exhaust pipe is connected to the air outlet of the fan. A solenoid valve H is provided on the cooling exhaust pipe. The solenoid valve H is preferably a high-temperature solenoid valve 26. In this embodiment, the cooling exhaust pipe is connected between the heater temperature sensor transmitter 23 and the 160°C gas constant temperature heater 19 through a tee. The outer end of the cooling exhaust pipe is the heater cooling exhaust port 28.
[0031] Optionally, a pressure relief safety valve 7 is provided on the cylinder cover 9 of the extraction cylinder.
[0032] This embodiment also includes a central control unit 34, optionally an AI controller, used for data acquisition, storage, and command issuance for control of the aforementioned solenoid valves, temperature sensors, and electrical appliances. The operating principle / steps of this utility model are as follows:
[0033] 1. Cool the inner wall of the extraction tank and the removable filter inner tank, then put the removable filter inner tank into the extraction tank, pour in the coffee powder, put in the coffee powder tamper cap, close the tank lid and lock it.
[0034] 2. Turn on the semiconductor cooler and the circulating water pump of the cooling water circulation system. Cooling water is injected into the coolant layer through the cooling water inlet, and the refrigeration system starts to work. The water temperature is sent to the central control unit by the cooling water temperature sensor transmitter for real-time monitoring and adjustment.
[0035] 3. After the cooling program is started, high-temperature solenoid valves F and E, the high-temperature resistant miniature fan, and the 160℃ gas constant-temperature heater are activated, while solenoid valves G and H are closed, and the heating program begins. The heating system temperature is monitored in real time and adjusted by the central control unit, which receives data from the circulating gas temperature sensor transmitter and the heater temperature sensor transmitter. During the Maillard reaction, if the pressure inside the reaction cylinder becomes too high, the pressure will be released and adjusted by the pressure relief safety valve installed on the openable cylinder head.
[0036] 4. After the Maillard reaction is completed, the high-temperature solenoid valve F, the high-temperature solenoid valve E, and the 160°C gas constant temperature heater are closed, while the solenoid valve G and the high-temperature solenoid valve H are opened. The high-temperature resistant micro fan continues to work, and air enters the 160°C gas constant temperature heater from the heater cooling inlet and is discharged from the heater cooling exhaust port until the 160°C gas constant temperature heater cools down. Then the high-temperature resistant micro fan stops working.
[0037] 5. After the Maillard reaction is complete, the weakly alkaline water generator, solenoid valve A, coffee water supply, and circulating water pump start working, while solenoid valve B closes. Drinking water enters the weakly alkaline water generator through the drinking water inlet and is electrolyzed into weakly alkaline water. This weakly alkaline water is then injected into the extraction tank through the extraction water nozzle. The volume of the extract is monitored by a flow transmitter, and the data is sent to the central control unit for real-time monitoring and adjustments. Once the extract has been added, the weakly alkaline water generator, solenoid valve A, coffee water supply, and circulating water pump stop working, and solenoid valve B opens, initiating the formal extraction stage.
[0038] 6. After the formal extraction mode is turned on, solenoid valve B and high-temperature solenoid valve D are turned on, while solenoid valve C, i.e., coffee dispensing valve 30, is turned off. The coffee water adding and circulating water pump stops working and starts once an hour to circulate the cold brew coffee liquid and allow more coffee components to dissolve.
[0039] 7. After coffee extraction is complete, the coffee dispensing valve 30 is opened, and the coffee pulp enters the 300-mesh secondary filter for filtration. Finally, it is discharged into the bottling system through the finished coffee liquid outlet, and the extraction process is completed.
Claims
1. A cold brew coffee extraction device, characterized in that: The extraction system includes an extraction cylinder, within which a detachable filter liner is installed. A circulating gas pipeline is provided between the upper and lower parts of the extraction cylinder. A gas heater is installed on the circulating gas pipeline. A circulating water pipeline is also provided between the upper and lower parts of the extraction cylinder. A coolant layer is provided between the inner and outer walls of the extraction cylinder. A cooling water circulation pipeline is provided between the upper and lower parts of the coolant layer. A cooling water circulation pump and a chiller are installed on the cooling water circulation pipeline for cooling the circulating cooling water within the pipeline.
2. The cold brew coffee extraction device according to claim 1, characterized in that: The extraction tank is equipped with a removable powder pressing cover.
3. The cold brew coffee extraction device according to claim 1, characterized in that: A cooling water temperature sensor transmitter is also installed on the cooling water circulation pipeline.
4. The cold brew coffee extraction apparatus according to claim 1, characterized in that: The circulating gas pipeline is equipped with a circulating gas temperature sensor transmitter and a heater temperature sensor transmitter. The circulating gas temperature sensor transmitter is located at the inlet end of the circulating gas pipeline; the heater temperature sensor transmitter is located at the outlet end of the circulating gas pipeline; the gas heater is located between the circulating gas temperature sensor transmitter and the heater temperature sensor transmitter; the outlet end of the circulating gas pipeline is connected to the circulating water pipeline via a T-junction A.
5. A cold brew coffee extraction apparatus according to claim 4, characterized in that: The circulating water pipeline is equipped with a circulating water pump and a solenoid valve B. An inlet pipe is also provided between the circulating water pump and the solenoid valve B. A weak alkaline generator, a solenoid valve A, and a flow transmitter are provided on the inlet pipe.
6. The cold brew coffee extraction apparatus according to claim 5, characterized in that: A high-temperature solenoid valve D is installed on the circulating water pipeline, and the high-temperature solenoid valve D is located between the three-way valve A and the solenoid valve B.
7. A cold brew coffee extraction apparatus according to claim 6, characterized in that: A finished coffee concentrate discharge pipe is also provided between the high-temperature solenoid valve D and the solenoid valve B; a solenoid valve C is provided on the finished coffee concentrate discharge pipe.
8. The cold brew coffee extraction apparatus according to claim 1, characterized in that: The circulating air pipeline is equipped with a fan, a high-temperature solenoid valve F, and a cooling air inlet pipe at its inlet end; the cooling air inlet pipe is connected to the air inlet of the fan; and a solenoid valve G is installed on the cooling air inlet pipe.
9. A cold brew coffee extraction apparatus according to claim 8, characterized in that: A cooling exhaust pipe is provided at the outlet end of the circulating air pipeline, and the cooling exhaust pipe is connected to the air outlet of the fan; a solenoid valve H is provided on the cooling exhaust pipe.
10. A cold brew coffee extraction apparatus according to claim 1, characterized in that: A gap is reserved between the filter inner liner and the inner wall of the extraction cylinder, and the bottom center of the filter inner liner bulges upward.