Back pressure valve structure and beverage extraction device with same

Abstract

The invention provides a back pressure valve structure. The front end of a valve element of the back pressure valve structure is provided with a fixation part which is used for being fixedly assembledwith a piston, the rear end of the valve element is provided with a plug which is made from a flexible material and can seal or open a water outlet hole in a piston base, the piston is movably sleeved with the piston base and can move forwards and backwards relative to the piston base, and correspondingly, the plug can move forwards and backwards relative to the water outlet hole. The piston hasthe trend of moving forwards relative to the piston base under the effect of elasticity, so that the plug has the trend of blocking the water outlet hole all the time; when the structure is in an extraction state, the piston is stressed by backward jacking force and drives the plug to move backwards, and then the water outlet hole can be opened by the plug. The invention further provides a beverage extraction device with the back pressure valve. When a handle is closed, the water outlet hole is opened, no extra back pressure resistance is generated in a water supply passage, and the loss of water pressure can be reduced; when the handle is opened, the water outlet hole is blocked by the plug, and steam can be prevented from being ejected accordingly; few parts are involved in the back pressure structure, the overall structure is simple, the cost is low, and the assembly is convenient.

Description

technical field [0001] The invention relates to the technical field of beverage extraction, in particular to a back pressure valve structure for a beverage extraction device and a beverage extraction device with the back pressure valve structure, and the back pressure valve structure is especially suitable for a water supply channel of the extraction device. Background technique [0002] When a coffee machine or a similar beverage extraction device is extracting a beverage, it is necessary to place a coffee capsule in the extraction cavity, and pump water into the heating device to heat it. The hot water passes through the coffee capsule in the extraction cavity, and the coffee capsule The powder is extracted and brewed, and the extracted drink flows out from the water outlet of the extraction chamber for human use. In order to obtain a better brewing effect, the coffee machine uses high temperature and high pressure extraction. This leads to the fact that after the coffee ...

AI Technical Summary

Problems solved by technology

[0004] The sealing force of the above-mentioned back pressure structure on the outlet is constant and cannot be adjusted according to the situation. At the same time, it will also reduce the pressure during extraction, which cannot meet the pressure and sealing requirements of different extraction systems. In particular, the preparation of coffee usually requires a higher extraction pressure. , in the case of a one-way valve assembly, the one-way valve will inevitably reduce the pressure that the extraction chamber can reach, unless a higher-pressure water pump is used, and a water pump that can provide a higher pressure means an increase in cost, At the same time, it also wastes energy and increases the cost of use

Images