Negative pressure pre-soaking system

Abstract

The utility model provides a negative pressure pre-soaking system, and relates to the technical field of coffee machine extraction. The negative-pressure pre-soaking system is used for coffee extraction of a coffee machine and comprises a water tank, a flow meter, a water pump, a heating block, a first electromagnetic valve, a brewing head, a negative-pressure generator, a pressure sensor, a water level sensor, a second electromagnetic valve and a waste water disc, and a water outlet of the water tank is connected with the flow meter through a connecting pipeline. The output end of the flow meter is connected with the water pump through a connecting pipeline, and the water outlet end of the water pump is connected with the heating block through a connecting pipeline. According to the negative-pressure pre-soaking system, coffee can be completely soaked by injecting water every time, and meanwhile, constant pressure is applied to coffee powder, so that a pre-soaking process with an obvious effect is generated, the extraction rate and the coffee flavor can be effectively improved, and the obvious effects of reducing the channel effect, exhausting and the like can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee machine extraction, in particular to a negative pressure pre-soaking system. Background Art

[0002] Pre-soaking involves applying low-pressure hot water to the coffee grounds to pre-wet them. This process helps create resistance to high-pressure extraction, minimizing the possibility of drainage and fines migration, and preventing channeling. Channeling refers to the phenomenon in which the inertia of water, caused by its surface tension, causes water to flow through easily accessible areas, neglecting other pathways, resulting in uneven extraction. Pre-soaking increases the extraction surface area, improving extraction yield and enhancing the depth and richness of the coffee's flavor. Pre-soaking also helps release carbon dioxide trapped within the coffee bean's cell walls. This gas, upon contact with hot water during extraction, rapidly transforms into a gaseous state, increasing the resistance within the coffee puck and hindering balanced extraction. Pre-soaking the carbon dioxide release allows for more stable extraction of the grounds, thereby enhancing the depth and richness of the extracted flavor. Overall, pre-soaking is a technique for optimizing the coffee extraction process. By pre-wetting the coffee grounds with low-pressure hot water, it improves extraction efficiency and quality, resulting in a richer, more balanced cup.

[0003] While most espresso machines on the market currently feature a pre-infusion program, these methods typically involve injecting a certain amount of hot water into the brew head before full-pressure extraction, followed by a pause of a few seconds as a pre-infusion process before injecting a large flow of hot water for extraction, or directly commencing full-pressure extraction. This pre-infusion method is highly uncertain because the pressure generated by the water injection process into the brew head during pre-infusion is not constant. Furthermore, due to differences in coffee bean variety, roast degree, and grind size, coffee grounds have varying water absorption rates. Consequently, this pre-infusion method often results in the coffee grounds in the powder basket remaining dry while water enters the upper layer. This indicates inadequate pre-infusion.

[0004] Therefore, the utility model proposes a coffee brewing system that can perform pre-soaking evenly and fully, so that the coffee extraction process is more stable and the flavor of the extracted coffee liquid is more obvious. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the utility model provides a negative pressure pre-infusion system, which allows each water injection to completely soak the coffee while also applying constant pressure to the coffee powder, thereby producing an effective pre-infusion process, which can effectively improve the extraction rate and coffee flavor, reduce the channel effect, and exhaust, etc.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a negative pressure pre-infusion system, which is used for coffee extraction in a coffee machine, and the negative pressure pre-infusion system includes a water tank, a flow meter, a water pump, a heating block, a first solenoid valve, a brewing head, a negative pressure generator, a pressure sensor, a water level sensor, a second solenoid valve and a waste water tray, the water outlet of the water tank is connected to the flow meter through a connecting pipe, the output end of the flow meter is connected to the water pump through a connecting pipe, the water outlet end of the water pump is connected to the heating block through a connecting pipe, the water outlet end of the heating block is connected to the first solenoid valve through a connecting pipe, the water outlet end of the first solenoid valve is connected to the brewing head through a connecting pipe, the brewing head is connected to the negative pressure generator, the negative pressure generator is connected to the pressure sensor, the pressure sensor is connected to the water level sensor, the water level sensor is connected to the second solenoid valve, and the water outlet end of the second solenoid valve is connected to the waste water tray.

[0009] Preferably, the pressure sensor and the water level sensor can be connected in parallel between the negative pressure generator and the second solenoid valve;

[0010] Through the above technical solution, both connection methods can realize the function of detecting liquid water level.

[0011] Preferably, a coffee cup is placed below the water outlet of the brewing head for receiving the extracted coffee.

[0012] Working principle: The working steps of the negative pressure pre-infusion system for coffee extraction in a coffee machine are as follows: when the user operates the coffee machine to extract coffee, the coffee machine first performs the pre-infusion process. At this time, the water pump 103 of the negative pressure pre-infusion system starts working, pumping liquid from the water tank 101 and injecting it into the heating block 104 to obtain 92°C hot water. At this time, the first solenoid valve 105 opens to inject water into the brewing head 106. At the same time, the negative pressure generator 108 works to generate negative pressure under the brewing head 106. The negative pressure enables the hot water injected into the first solenoid valve 105 to evenly soak the coffee powder in the brewing head 104 and apply a certain negative pressure. Synchronously, the negative pressure sensor 109 starts to work synchronously and starts to detect the negative pressure inside the brewing head. When the negative pressure reaches the set threshold, the negative pressure generator 108 stops working. At the same time, the water level sensor 110 detects the liquid, indicating that the pre-infusion is completed. The second solenoid valve 111 opens and closes to release the negative pressure. After the pre-soaking is completed, the water pump 103 starts working again and starts to extract the coffee at full pressure. When the extraction process is completed, the extraction is completed.

[0013] (3) Beneficial effects

[0014] The utility model provides a negative pressure pre-soaking system with the following beneficial effects:

[0015] The utility model provides a negative pressure pre-infusion system, by arranging a negative pressure device inside the coffee extraction device, the negative pressure device ensures that each time water is injected, the coffee can be completely soaked, and at the same time, a constant pressure is applied to the coffee powder, thereby producing a pre-infusion process with obvious effect, which can effectively improve the extraction rate and coffee flavor, reduce the channel effect, exhaust and other obvious effects. The structure is controlled by a negative pressure sensor and a water level sensor, and the infusion effect is consistent and controllable each time, thereby greatly improving the extraction quality of the coffee extraction device, and is not affected by the type of coffee beans, the grinding degree of the coffee powder, and the amount of coffee powder, so that the pre-infusion effect is stable and the quality of the pre-infusion is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram of the serial installation of the negative pressure pre-soaking system of the present invention;

[0017] Figure 2 This is a diagram of the parallel installation method of the negative pressure pre-soaking system of the present invention.

[0018] Legend: 101, water tank; 102, flow meter; 103, water pump; 104, heating block; 105, first solenoid valve; 106, brewing head; 107, coffee cup; 108, negative pressure generator; 109, pressure sensor; 110, water level sensor; 111, second solenoid valve; 112, waste water tray. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings to clearly and comprehensively describe the technical solutions in the embodiments of the present invention. It should be noted that the described embodiments are only some of the embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without inventive effort are within the scope of protection of the present invention. It should be noted that the terms used herein are intended only to describe specific embodiments and are not intended to limit the exemplary embodiments of the present invention. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to scale. Technologies, methods, and devices known to persons of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] Example 1:

[0021] like Figure 1 and Figure 2 As shown, the embodiment of the present invention provides a negative pressure pre-infusion system, which is used for coffee extraction in a coffee machine. The negative pressure pre-infusion system includes a water tank 101, a flow meter 102, a water pump 103, a heating block 104, a first solenoid valve 105, a brewing head 106, a negative pressure generator 108, a pressure sensor 109, a water level sensor 110, a second solenoid valve 111 and a waste water tray 112. The water outlet of the water tank 101 is connected to the flow meter 102 through a connecting pipe, the output end of the flow meter 102 is connected to the water pump 103 through a connecting pipe, the water outlet end of the water pump 103 is connected to the heating block 104 through a connecting pipe, and the water outlet end of the heating block 104 is connected to the water outlet end of the heating block 104. The coffee pot is connected to the first solenoid valve 105 through a connecting pipe, the water outlet end of the first solenoid valve 105 is connected to the brewing head 106 through a connecting pipe, the brewing head 106 is connected to the negative pressure generator 108, the negative pressure generator 108 is connected to the pressure sensor 109, the pressure sensor 109 is connected to the water level sensor 110, the water level sensor 110 is connected to the second solenoid valve 111, and the water outlet end of the second solenoid valve 111 is connected to the waste water tray 112. The pressure sensor 109 and the water level sensor 110 can be connected in parallel between the negative pressure generator 108 and the second solenoid valve 111. A coffee cup 107 is placed at the water outlet below the brewing head 106 for receiving the extracted coffee.

[0022] Example 2:

[0023] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a negative pressure pre-soaking system. Pre-soaking is the first stage of Italian coffee extraction. It refers to the process of sending some water into the coffee powder cake before extracting with coffee powder, so that the coffee powder layer is gradually soaked and the coffee powder cake reaches the optimal stable state for extraction. The main functions of the coffee machine pre-soaking include improving the extraction rate, reducing the channel effect, exhausting and improving the coffee flavor. Pre-soaking is an indispensable step in the coffee extraction process. Through the above-mentioned mechanism of action, the extraction efficiency and quality of coffee are significantly improved. A negative pressure generator is provided inside it. By generating negative pressure, the water pump can evenly pass through the coffee powder cake and apply negative pressure to the coffee powder to perform the coffee powder pre-soaking action. A negative pressure sensor and a water level sensor are provided inside the negative pressure generator. When the negative pressure reaches the set value and the water level sensor detects the presence of water, the pre-soaking ends and the formal full-pressure extraction begins. When the user operates the coffee machine to extract coffee, the extraction steps of the coffee machine are as follows:

[0024] S1: The coffee machine first performs a pre-infusion process. At this time, the water pump 103 works, pumping liquid from the water tank 101 and injecting it into the heating block 104 to obtain 92°C hot water.

[0025] S2: The first solenoid valve 105 is opened to inject water into the brewing head 106. At the same time, the negative pressure generator 108 operates to generate negative pressure below the brewing head 106. The negative pressure causes the hot water injected into the solenoid valve 105 to evenly soak the coffee grounds inside the brewing head 104 and apply a certain negative pressure.

[0026] S3: The negative pressure sensor 109 starts to work synchronously to detect the negative pressure inside the brewing head. When the negative pressure reaches the set threshold, the negative pressure generator 108 stops working.

[0027] S4: At the same time, the water level sensor 110 detects liquid, indicating that the pre-soaking is complete, and the solenoid valve 111 opens and closes to release the negative pressure;

[0028] S5: After the pre-soaking is completed, the water pump 103 starts working again to extract the coffee at full pressure. When the extraction process is completed, the extraction is completed.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A negative pressure pre-soaking system, characterized in that: The negative pressure pre-infusion system is used for coffee extraction in a coffee machine. The negative pressure pre-infusion system comprises a water tank (101), a flow meter (102), a water pump (103), a heating block (104), a first electromagnetic valve (105), a brewing head (106), a negative pressure generator (108), a pressure sensor (109), a water level sensor (110), a second electromagnetic valve (111) and a waste water tray (112). The water outlet of the water tank (101) is connected to the flow meter (102) via a connecting pipe, the output end of the flow meter (102) is connected to the water pump (103) via a connecting pipe, and the water outlet end of the water pump (103) is connected to the water pump (103) via a connecting pipe. The connecting pipe is connected to the heating block (104), the water outlet end of the heating block (104) is connected to the first solenoid valve (105) through the connecting pipe, the water outlet end of the first solenoid valve (105) is connected to the brewing head (106) through the connecting pipe, the brewing head (106) is connected to the negative pressure generator (108), the negative pressure generator (108) is connected to the pressure sensor (109), the pressure sensor (109) is connected to the water level sensor (110), the water level sensor (110) is connected to the second solenoid valve (111), and the water outlet end of the second solenoid valve (111) is connected to the waste water tray (112).

2. A negative pressure pre-soaking system according to claim 1, characterized in that: The pressure sensor (109) and the water level sensor (110) can be connected in parallel between the negative pressure generator (108) and the second solenoid valve (111).

3. The negative pressure pre-soaking system according to claim 1, characterized in that: A coffee cup (107) is placed at the water outlet below the brewing head (106) for receiving the extracted coffee.

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