Is Bkon good for coffee? What is the principle of negative pressure, vacuum and positive pressure?

Professional coffee knowledge exchange more coffee bean information please follow the coffee workshop (Wechat official account cafe_style)

People who like coffee must be very familiar with the word "extraction". Extraction is a very important part of getting a cup of delicious coffee, and many enthusiasts or coffee maker manufacturers are trying to optimize the process to make the coffee more delicious. Tools like VST/MojoToGo abound, and the SCAA American Special Coffee Association has been pushing through the old and bringing forth the new, regardless of whether there are new similar tools in front of us. Recently, one of the most interesting examples of "extraction" technology has come to us: this automatic vacuum brewing machine called BKON brewer, which can play a very important role in the processing of high-end beverage foods.

A few years ago, in the matter of tea-making machines, more European and American companies had a say, which was reflected in the mode of using machines to extract tea. making tea seems to follow the method of making coffee-even at first many tea shops are trying to use the coffee mechanism as a tea drink. Different teas are made into tea capsules one by one, and each capsule is given a different code according to the difference of the tea. after the tea capsule is put into the tea brewing machine, the tea will automatically identify the type of tea, and then choose the temperature, water and time suitable for this kind of tea. finally, press the button, 90 seconds later, a cup of tea is ready.

Began to use vacuum technology. Rain (Reverse Atmospheric Infusion) is a negative pressure extraction technology. First of all, the air in the raw material is extracted by negative pressure, and then the liquid and the raw material are extracted and recycled. Rain can increase the control of extraction by controlling vacuum intensity, vacuum time and vacuum frequency, and these new parameters give engineers in the cloud a lot of room to play.

With a highly automated design, more than 40 drinks can be produced in an hour, with an average of about 90 seconds per cup. And it has automatic cleaning function. Coffee and tea are basic skills, and they can be used in almost all drinks, whether it's cocktails or fruit juices, or even unprecedented combinations.

The general idea is to mathematically mix some important elements of the drink, and then use different algorithms to prepare drinks with highly consistent tastes. For the coffee party, which pursues the quality of life and has disabled hands, this is a great blessing in the age of science and technology.

Negative pressure

The use is very common, people often make a certain part of the space in a state of negative pressure, so that they can use the ubiquitous atmospheric pressure to work for us. For example, when people breathe, negative pressure occurs when the lungs are dilated, and a pressure difference is formed inside and outside the lungs. Fresh air is pressed into the lungs.

This concept is often involved in industry, especially in the selection of micro pumps (such as micro vacuum pump, micro air pump, micro gas sampling pump, micro gas circulation pump, micro air pump). For example, there is a miniature vacuum pump, which can form the negative pressure of 0.04MPA at the pumping end, which means that it can remove 40% of the gas from the airtight container and the remaining 60%. The pressure difference with the external atmospheric pressure is 100 * (1-0.6) = 40KPA (that is, its negative pressure value is:-40Kpa), which is shown as-0.04Mpa on the commonly used vacuum gauge. (suppose the local atmospheric pressure is 0.1Mpa)

The function of vacuum

⒈ removes the non-condensable gas from the system: the existence of the non-condensable gas will increase the condensation pressure and exhaust temperature of the system, and affect the refrigeration effect; it may also lead to the carbonization of the lubricating oil at high temperature, endanger the normal operation of the compressor, and even burn out the compressor motor.

⒉ removes moisture from the system: moisture is the biggest killer in the refrigeration system (especially the Freon system in the steam compression refrigeration cycle). First of all, the interaction between lubricating oil and moisture will produce acid, which will corrode the system, and at the same time, it will cause "copper plating" phenomenon, damaging the compressor; at the same time, moisture will cause ice in the expansion valve port or capillary tube, resulting in "ice blockage".

Positive pressure

A positive pressure is a state of gas that is higher than normal pressure (that is, an atmospheric pressure). For example, when you pump air into a bicycle or car tire, the outlet of the pump or pump produces positive pressure.

This concept is often involved in industry, especially in the selection of micro pumps (such as micro booster pump, micro air pump, micro air pump, micro gas circulation pump, micro pump, micro inflatable pump, etc.).

For more professional coffee exchanges, please scan the code and follow Wechat: qiannjie

Please indicate the source of the reprint.