Saturated brewing head with adjustable flow rate

Abstract

The utility model discloses a flow-speed-adjustable saturated brewing head, which belongs to the field of brewing devices of coffee machines and comprises a brewing head cavity, a cavity cover, a shunt valve, an extraction cavity and a handle. A heating wire and a shunt valve are arranged in the cavity of the brewing head, the shunt valve is communicated with the extraction cavity through a nozzle, and a water diversion net is arranged between the nozzle and the extraction cavity; a temperature sensor and a flow regulating valve are integrated on the cavity cover; a water inlet pipe at the lower end of the flow regulating valve extends into the cavity; a side water outlet pipe of the flow regulating valve is connected with an external liquid conveying pipe, the tail end of the liquid conveying pipe is communicated with a water inlet pipe of the shunt valve through a hydraulic electromagnetic valve, a pressure relief opening is arranged downwards and is flush with the bottom of the extraction cavity, and residual water is rapidly and completely discharged by combining the hydraulic electromagnetic valve; and a filter screen is additionally arranged at the opening of the water inlet pipe, so that the pipeline is prevented from being blocked.

Description

Technical Field

[0001] This utility model belongs to the field of coffee brewing devices, and in particular relates to an adjustable flow rate saturation brewing head, which is suitable for brewing coffee in a semi-automatic coffee machine. Background Technology

[0002] With the development of society and the economy, people's quality of life has continuously improved, and coffee has gradually become a popular beverage in daily life. The brew head of a coffee machine is responsible for providing hot water, evenly passing it through the portafilter, and extracting a rich espresso. It is usually located at the top of the coffee machine, connecting the boiler and the portafilter, and controls the water temperature and pressure to ensure the extraction quality and taste of the coffee. Existing brew heads allow for adjustable flow rates, but these are generally controlled by a flow restrictor, with the flow rate typically fixed at 600ml / min and unchangeable. Furthermore, after brewing, the brew head usually undergoes a pressure release and drainage process to release pressure and residual water from the extraction chamber, allowing the portafilter to be removed for cleaning. However, the design of the pressure release port in existing brew heads is often unreasonable; it is usually positioned higher than or far from the extraction chamber, sometimes even leading to insufficient pressure release and drainage. Over time, this can affect the stability and hygiene of the machine. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by designing an adjustable flow rate saturated brewing head that can completely remove residual water from the extraction chamber through a reasonable pressure relief port design.

[0004] The present invention provides an adjustable flow rate saturated brewing head, comprising a brewing head cavity, a cavity cover, a water distribution valve, an extraction chamber, and a handle. The inner cavity of the brewing head cavity is provided with a heating wire and a water distribution valve, which is connected to a nozzle above the extraction chamber. A water distribution mesh is provided between the nozzle and the extraction chamber. A water inlet is provided on the side wall of the brewing head cavity. The cavity cover is a sealing cap pressed against the top of the brewing head cavity. A temperature sensor is provided on the cavity cover. The characteristic feature is that a flow regulating valve is provided on the cavity cover. The water inlet pipe at the lower end of the flow regulating valve extends into the inner cavity of the brewing head cavity. The water outlet pipe on the side of the flow regulating valve is connected to the water inlet of an external water supply pipe. The water outlet at the end of the water supply pipe is connected to the water inlet pipe of the water distribution valve through a three-way connector. A hydraulic solenoid valve is provided below the three-way connector, with the pressure relief port facing downwards and the axis of the pressure relief port flush with the bottom of the extraction chamber.

[0005] Ideally, a filter screen should be provided at the inlet of the water inlet pipe at the lower end of the flow regulating valve.

[0006] Ideally, the water pipe should be provided with an insulation layer.

[0007] Preferably, the temperature sensor is electrically connected to the heating wire to form a closed-loop temperature control system with a temperature control accuracy of ±1℃.

[0008] Ideally, the solenoid valve should be a two-way three-position solenoid valve.

[0009] Preferably, the flow regulating valve is a rotary throttle valve, which can adjust the water flow rate to 30-800 ml / min.

[0010] The advantages of this utility model are: 1. By adding a flow regulating valve, users can freely adjust the water flow rate according to the characteristics of coffee beans or extraction needs, achieving precise extraction control and significantly improving the consistency of coffee flavor; 2. The pressure relief port is arranged downwards and close to the extraction chamber, and in conjunction with the hydraulic solenoid valve, it ensures that the pressure is released instantly after extraction and residual water is discharged, eliminating the problem of bacterial growth caused by water accumulation; 3. The water pipe has an external insulation layer to form a thermal buffer zone, which, combined with the closed-loop control of the heating wire and temperature sensor in the brewing head cavity, effectively avoids uneven extraction caused by heat loss; 4. The inlet of the flow regulating valve is equipped with a filter screen, which can effectively intercept particulate impurities, reduce the risk of pipeline blockage, and extend service life. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] In the diagram, 1. Brewing head cavity, 2. Heating wire, 3. Inner cavity, 4. Cavity cover, 5. Temperature sensor, 6. Flow control valve, 7. Water pipe, 8. Insulation layer, 9. Water inlet, 10. Hydraulic solenoid valve, 11. Pressure relief port, 12. Water distribution screen, 13. Water inlet pipe, 14. Coffee outlet, 15. Extraction chamber, 16. Water distribution valve, 17. Nozzle, 18. Handle, 19. T-connector, 20. Filter screen. Detailed Implementation

[0013] The present invention will be further described with reference to the accompanying drawings.

[0014] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] like Figure 1The adjustable flow rate saturated brewing head shown includes a brewing head cavity 1, a cavity cover 4, a water distribution valve 16, an extraction chamber 15, and a handle 18. The inner cavity 3 of the brewing head cavity 1 is hollow, and a spiral heating wire 2 is embedded circumferentially in the inner cavity 3 for rapid heating of the water flow. The water distribution valve 16 is located in the brewing head cavity 1, and its lower part is connected to the nozzle 17 above the extraction chamber 15 by a thread. A water distribution mesh 12 is provided between the nozzle 17 and the extraction chamber 15 for evenly dispersing the water flow. The coffee outlet 14 is connected to the lower part of the extraction chamber 15. A water inlet 9 is provided on the side wall of the brewing head cavity 1, which is connected to an external water source through a pipe. The cavity cover 4 is secured by bolts. The sealing cap is pressed on the top of the brewing head cavity 1. The cavity cap 4 is equipped with a temperature sensor 5 to detect the water temperature in the inner cavity 3. The main feature is that the cavity cap 4 is equipped with a flow regulating valve 6, which is vertically installed on one side of the cavity cap 4. Its lower end water inlet pipe 13 extends into the inner cavity 3 of the brewing head cavity 1. The water outlet pipe on the side of the flow regulating valve 6 is connected to the inlet of the external water supply pipe 7. The end outlet of the water supply pipe 7 is connected to the inlet pipe 13 of the water distribution valve 16 through a three-way connector 19. A hydraulic solenoid valve 10 is provided below the three-way connector 19. The pressure relief port 11 is set downwards, and the axis of the pressure relief port 11 is flush with the bottom of the extraction chamber 15. The pressure relief pipeline is connected to the external wastewater pan.

[0016] Working principle: 1. During the water injection stage, hot water from the boiler enters the brewing head cavity 1 through the inlet 9. The heating wire 2 performs PID temperature control based on feedback from the temperature sensor 5. 2. Rotating the flow regulating valve 6 knob controls the flow rate of water from the inlet pipe 13 to the outlet pipe 7 by changing the valve core opening (adjustment range 30-800ml / min). 3. During the extraction stage, the hydraulic solenoid valve 10 opens, and hot water evenly wets the coffee grounds through the water distribution valve 16, nozzle 17, and water distribution mesh 12. 4. After the coffee is extracted and discharged from the outlet 14, the hydraulic solenoid valve 10 closes the main passage. The spring force pushes the valve core to open the pressure relief port. The pressure relief port 11 connects the water distribution valve 16 pipeline with the pressure relief pipeline. The residual water in the extraction chamber 15 is discharged through the pressure relief port 11 under the drive of the residual pressure, so that the handle 18 can be removed for cleaning.

[0017] A filter screen 20 is provided at the inlet of the water inlet pipe 13 at the lower end of the flow regulating valve 6 to intercept scale and impurities.

[0018] An insulation layer 8 is provided outside the water pipe 7 to form a thermal buffer zone.

[0019] The temperature sensor 5 is electrically connected to the heating wire 2 to form a closed-loop temperature control system with a temperature control accuracy of ±1℃.

[0020] The hydraulic solenoid valve 10 is a two-way three-position solenoid valve. When the power is cut off, the spring force pushes the valve core to open the pressure relief port and close the water inlet.

[0021] The flow regulating valve 6 is a rotary throttle valve, which can adjust the water flow rate from 30 to 800 ml / min.

[0022] The present invention has been described in detail above through embodiments, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of implementation of the present invention. All changes and improvements made in accordance with the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. An adjustable flow rate saturated brewing head, comprising a brewing head cavity (1), a cavity cover (4), a water distribution valve (16), an extraction chamber (15), and a handle (18), wherein the inner cavity (3) of the brewing head cavity (1) is provided with a heating wire (2) and a water distribution valve (16), the water distribution valve (16) is connected to a nozzle (17) above the extraction chamber (15), a water distribution mesh (12) is provided between the nozzle (17) and the extraction chamber (15), a water inlet (9) is provided on the side wall of the brewing head cavity (1), the cavity cover (4) is a sealing cover pressed on the top of the brewing head cavity (1), and a temperature sensor (5) is provided on the cavity cover (4), characterized in that: The cavity cover (4) is provided with a flow regulating valve (6). The water inlet pipe (13) at the lower end of the flow regulating valve (6) extends into the inner cavity (3) of the cooking head cavity (1). The water outlet pipe on the side of the flow regulating valve (6) is connected to the inlet of the external water supply pipe (7). The end of the water supply pipe (7) is connected to the water inlet pipe (13) of the water distribution valve (16) through a three-way connector (19). A hydraulic solenoid valve (10) is provided below the three-way connector (19). The pressure relief port (11) is set downwards, and the axis of the pressure relief port (11) is flush with the bottom of the extraction chamber (15).

2. The adjustable flow rate saturated brewing head according to claim 1, characterized in that: A filter screen (20) is provided at the inlet of the water inlet pipe (13) at the lower end of the flow regulating valve (6).

3. The adjustable flow rate saturated brewing head according to claim 1, characterized in that: The water pipe (7) is wrapped with an insulation layer (8).

4. The adjustable flow rate saturated brewing head according to claim 1, characterized in that: The temperature sensor (5) is electrically connected to the heating wire (2) to form a closed-loop temperature control system with a temperature control accuracy of ±1℃.

5. The adjustable flow rate saturated brewing head according to claim 1, characterized in that: The hydraulic solenoid valve (10) is a two-way three-way solenoid valve.

6. The adjustable flow rate saturated brewing head according to claim 1, characterized in that: The flow regulating valve (6) is a rotary throttle valve, which can adjust the water flow rate to 30-800 ml / min.

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