Simple functional description of each part of the coffee machine
Boiler:
At present, the popular coffee machine boiler is mainly made of copper and stainless steel, but some manufacturers also use copper alloy and copper plating.
The main characteristics of copper boilers are good extensibility (good elasticity when frequent alternation of hot and cold water) and fast heat transfer speed. It was widely used in early wineries, such as some spirits distillation equipment. Figure 1.JPG (17.84 KB)
Liquor distillation equipment
For the coffee machine, the speed of heat transfer will directly affect the overall heating uniformity, so copper naturally becomes the main material for making boilers. Now the cooking heads of some machines are also made of copper to facilitate the maintenance of effluent temperature.
Since stainless steel appeared much later than copper, the original coffee machine has always been made of copper. The main advantages of stainless steel are non-corrosive and durable. But it seems that stainless steel boilers are very expensive.
In addition to the boiler, there are two devices to maintain the normal operation of the boiler: high-pressure valve, low-pressure valve and discharge valve.
High pressure valve
High pressure valve is a safety device, mainly to protect the safety of operators.
Main principle: when the water in the boiler is heated to produce pressure, and the pressure in the boiler reaches the preset 2bar, the valve will be opened and begin to relieve pressure, in order to avoid excessive pressure and exceed the pressure limit of the boiler itself.
Low pressure valve
A low-pressure valve is a valve set to maintain the normal operation of the coffee machine.
Main principle: avoid low pressure in the boiler caused by temperature drop and air volume contraction in the confined space. When reheating, the air expands faster than the temperature of the liquid caused by the heat conduction of the metal, which makes the pressure sensing element misjudge the pressure in the boiler and stop heating.
Discharge valve
The discharge valve is at the bottom of the boiler, mainly when turning on for a long time, keeping the water fresh, cleaning the scale in the boiler, and repairing the machine, all the water in the boiler needs to be removed. At this time, all the water in the boiler can be discharged by opening the discharge valve.
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History and usage of siphon pot
The history and usage of siphon coffee (plug-in brewing method) in 1840, a glass test tube in the laboratory triggered the invention of the siphon coffee maker (Syphon). The British took Biya's test tube for chemical experiments as the model to create the first vacuum coffee pot. Two years later, Mrs. Bachang of France improved this pot with a bit of spring shape, which is familiar to everyone.
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A mocha pot is a coffee pot.
Historically, the word mocha has been used as a nickname for coffee, and coffee is mocha. The coffee pot is the mocha pot. Invented by the Italians. Why is coffee a mocha? In the early 17th century, the first Yemeni coffee sold to Europe was exported through the ancient port of Mocha. Europeans (first of all, the merchants of Venice, Italy) called the delicious coffee shipped from the port of Mocha Mocha Coffee.
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