Valve structure for backwater adjustable coffee machine

Abstract

The invention relates to a valve structure for a backwater adjustable coffee machine, which comprises a valve body (1), wherein a water inlet cavity (11), a water outlet cavity (12), a pressure regulating cavity (13) and a backflow cavity (14) are arranged in the valve body. The valve structure is characterized in that the valve body is internally provided with a backwater adjusting cavity (15), the heat part of the backwater regulating cavity is also communicated with the backflow cavity (14) through an exhaust hole (141), the water inlet cavity is internally provided with an exhaust valve core (5) made of a flexible material, the heat of the exhaust valve core is provided with a groove and abuts against the exhaust hole, the rear part of the exhaust valve core resists against an exhaust valve compression spring (52), the rear end of the exhaust valve compression spring is provided with a regulating screw (53), and the regulating screw is in sealing screwing with the tail part of the backwater adjusting cavity. A backwater regulator is exposed due to no connection with a pipeline, therefore, after the water inlet cavity of the valve structure is arranged on a water inlet pipe, the regulating screw is screwed outside for adjusting the pre-tightening pressure of the exhaust valve compression spring to the exhaust valve core, so that the exhaust hole achieves the effects of ventilation and less water leakage.

Description

technical field [0001] The invention relates to an automatic valve for a water supply device of a coffee machine, in particular to a valve structure for a coffee machine with adjustable return water. Background technique [0002] Traditional brewers do not get the best extraction because the water takes too long to pass through the grounds, making it impossible to use finely ground coffee. In order to speed up the time of brewing coffee, in order to use finer coffee powder and obtain the best extraction rate, the Italians use the piston (Piston) or pump (Pump) to apply pressure to the hot water during the process of brewing coffee. , Push the pressurized hot water evenly into the filter filled with coffee, so that the brewing time can be reduced to less than 30 seconds, or even ten seconds, so as to speed up the extraction process and obtain a higher extraction rate. [0003] The structural composition and working process of the pressurized hot water supply system of the pu...

AI Technical Summary

Problems solved by technology

In actual use, it is found that there are some deficiencies in the existing pump pressurized water supply system: 1. The low pressure used by the pump coffee machine is only 2.5 bar, and the high one reaches 19-20 bar. The pressure that can be maintained by the one-way valve structure of the return channel in the water supply system is relatively fixed, so different return channels need to be equipped for different specifications of pressure water pumps, which has limited adaptability; 2. The boiler needs to be provided with a separate return port and The structure of the corresponding return pipe is relatively complicated; 3. The water pump may be empty due to reasons such as a period of non-use and lack of water in the water tank, resulting in problems such as failure to pump water and difficulty in discharging the air in the pump body, especially when the boiler is under pressure. It is even more likely to damage the water pump due to the lack of water for a long time

The compression spring and the exhaust valve spool in the aforementioned valve structure are located in the water inlet chamber, and the water inlet chamber needs to be connected to the water inlet pipe during installation, so the compression spring cannot be adjusted after installation, that is, the return water cannot be adjusted ; According to product requirements, the pressure of the exhaust valve compression spring on the exhaust valve spool should be such that the exhaust valve spool can just discharge air, but hot water will not pass through the exhaust hole. In order to achieve this high-quality Requirements, put forward very high requirements on the pressure setting of the compression spring, generally through a one-time installation, it is basically impossible to meet the better requirements, so the aforementioned automatic valve will have a large leak in the exhaust hole at the beginning of work, resulting in the coffee machine During use, there is always a large water leakage in the return chamber

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