Pump pressure type coffee machine brewing kettle with pressure control function and pressure control method

Abstract

The invention relates to a pump pressure type coffee machine brewing kettle with a pressure control function and a pressure control method. The pump pressure type coffee machine brewing kettle can directly measure and control the absolute pressure in a brewing kettle which directly influences the coffee quality so as to control the coffee quality, and comprises a coffee machine shell, a water pipe, a water tank, a hot water boiler, a high-pressure water pump, a base, a hot water nozzle and the brewing kettle, the coffee machine shell is installed on the base, the water tank is installed on thecoffee machine shell, and the water pipe, the hot water boiler and the high-pressure water pump are all arranged in the coffee machine shell. One end of the water pipe communicates with the water tank through the hot water boiler and the high-pressure water pump. The other end of the water pipe is communicated with the hot water nozzle, the hot water nozzle is installed on the coffee machine shell, the brewing kettle is also installed on the coffee machine shell and arranged on the hot water nozzle, and a coffee outlet is formed in the brewing kettle. The pump pressure type coffee machine brewing kettle is characterized by further comprising an absolute pressure sensor, a pressure sensor data acquisition and processing unit, a water pump bypass and a water pump bypass electromagnetic valve.

Description

Technical field [0001] The invention relates to a pump pressure coffee machine brewing kettle with a pressure control function and a pressure control method. Background technique [0002] Coffee is a beverage made from roasted and ground coffee beans as raw materials and cooked with water. Coffee beans contain about 100 different substances, including caffeine, tannins, oils and nitrogen compounds, etc., which can be produced with different flavors with various cooking utensils and methods. [0003] The espresso method is a method of making coffee. It is named after it originated in Italy. It mainly uses high-temperature and high-pressure water or steam to quickly flow through coffee powder to produce coffee. In addition to extracting the water-soluble substances in the coffee powder, high-pressure water can also further extract the non-water-soluble substances, and it can also completely emulsify the lipids in the coffee powder and dissolve into the water to produce a special fla...

AI Technical Summary

Problems solved by technology

[0040] In the prior art, only the outlet pressure of the high-pressure pump is considered. On the one hand, there is no throttling effect of the hot water nozzle, and the outlet pressure of the high-pressure pump is different from the pressure of the brewing kettle; on the other hand, the characteristics of the pipeline are not considered. When the quantity, particle size, and degree of compaction of coffee powder change, the pressure in the brewing kettle changes accordingly, which affects the taste of coffee; thirdly, when the coffee powder is too fine, compacted too tightly or the filter is blocked, the flow rate is close to zero, It will cause the pressure in the brewing kettle to be too high, which will affect the life of the gasket between the brewing kettle and the coffee machine body, and even cause high-pressure water to spray directly out of the gasket, resulting in failure. ACCIDENT;

[0041] Traditional technology uses gauge pressure as a pressure reference without considering the influence of atmospheric pressure, and atmospheric pressure is related to the altitude and weather of the location. The higher the altitude, the lower the atmospheric pressure; the atmospheric pressure at the same location will also change with the weather conditions

It can be seen from formula (6) that even if the gauge pressure pg measured remains unchanged, if pb changes, the absolute pressure at the measuring point will also be different, resulting in a change in the flavor of coffee

[0042] So to sum up, the current pump-pressed coffee machines cannot directly measure and control the absolute pressure in the brewing kettle that has a direct impact on coffee quality

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