Monitoring variable-pressure coffee machine

Abstract

The utility model relates to a monitoring variable-pressure coffee machine, which aims at solving the technical problems that the existing similar products are difficult to realize the setting and adjustment of extraction pressure gears through program or motor control, and a variable-pressure valve group module assembly needs to be improved. The coffee machine is characterized in that a stepping motor is arranged at the top of a main body support above a variable pressure valve group module of the coffee machine, a transmission shaft at the stepping motor extending into the main body support is connected with the extending end of a piston ejector rod of the variable pressure valve group module through an ejector rod connecting shaft, and the ejector rod connecting shaft is a coupler; the inner wall conical surface at the position of a cavity limiting platform in a cavity main body of the pressure transformation valve group module corresponds to and is aligned with the outer diameter conical surface at the position of an ejector rod limiting platform of a piston ejector rod in the pressure transformation valve group module, a water outlet is formed in one side above the cavity limiting platform in the cavity main body, and a compression spring is arranged on the outer diameter of the piston ejector rod in the cavity main body; the piston ejector rod is driven by the ejector rod connecting shaft and the stepping motor to move up and down, and the distance between the ejector rod limiting platform and the cavity limiting platform is adjusted.

Description

Technical Field

[0001] The utility model relates to coffee, in particular to a monitoring variable-pressure coffee machine. Background Art

[0002] A coffee machine is a fully automatic or semi-automatic appliance that integrates the entire process of brewing coffee, including grinding, pressing, filling, brewing (extraction), and removing dregs. When brewing (extracting) coffee, the existing coffee machine usually has different concentrations and tastes due to different pressures. To this end, some existing coffee machines are equipped with a water flow pressure-changing valve with a pressure regulating function during the brewing (extraction) process, such as the application number 202310079056.X disclosed in the Chinese patent literature, the application publication date 2023.04.14, and the invention name "Constant Pressure Variable Pressure Coffee Extraction System"; the inlet end of the circulation pipe of the system is connected to the water supply container through the delivery pump; the outlet end of the circulation pipe is connected to the water inlet of the heating chamber, and the pressure detection component is provided on the connected pipeline; a pressure limiting valve is provided on the pipeline connecting the three-way valve and the water outlet of the heating chamber, and the actual pressure value is detected in real time by a pressure sensor. Some other coffee machines are equipped with energy storage valves during the brewing (extraction) process, such as the application number 202322148936.6 disclosed in the Chinese patent literature, the authorization announcement date 2024.03.15, and the utility model name "a variable pressure extraction semi-automatic coffee machine"; the coffee machine is provided with an energy storage valve between the outlet of the heat exchange tube and the inlet pipe of the flow meter, and a water outlet solenoid valve is provided between the outlet pipe of the flow meter and the water inlet pipe of the brewing head, and the water outlet solenoid valve control button is installed on the control panel; the energy storage valve adopts a piston structure, which is composed of a spring chamber and an energy storage chamber, and an energy storage spring is installed in the spring chamber, and the energy storage chamber is connected to the outlet of the heat exchange tube. However, it is difficult for the above-mentioned products and similar products to realize the setting and adjustment of the extraction pressure gear through program or motor control, that is, there is a lack of the use of 3bar, 6bar, 9bar and 12bar four gears, or the setting and adjustment of the gears between 0bar-12bar, and the setting and improvement of the variable pressure valve group module assembly. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of the utility model is to provide a monitoring variable pressure coffee machine in the art, so as to solve the technical problems that the existing similar products are difficult to set and adjust the extraction pressure level through program or motor control, and lack the setting and improvement of the variable pressure valve group module component. The purpose is achieved through the following technical solutions.

[0004] A monitoring variable pressure coffee machine, wherein a main body support is provided in the body of the coffee machine, a water tank is provided at the rear of the main body support, a water receiving box is provided below the brewing head assembly on the front side of the main body support, water in the water tank passes through the water tank sealing ring support assembly in the main body support and enters the water pump in the main body support, and then flows into the brewing head assembly through the variable pressure valve group module in the main body support and is discharged, and the flow meter in the main body support is connected with the water tank sealing ring support assembly and the water pump through pipelines respectively; the key point of its structural design is that a stepping motor is provided at the top of the main body support above the variable pressure valve group module, and the transmission shaft at the stepping motor extending into the main body support is connected with one end of the piston push rod of the variable pressure valve group module through a push rod connecting shaft, and the push rod connecting shaft is A coupling, a tower-shaped push rod limiting platform at the other end of the piston push rod in the pressure-changing valve group module, a cavity limiting platform is provided on the inner wall of the bottom of the cavity body corresponding to the push rod limiting platform in the cavity body of the pressure-changing valve group module, the inner wall conical surface of the cavity limiting platform corresponds to and is aligned with the outer diameter conical surface of the push rod limiting platform, a water outlet is provided on one side above the cavity limiting platform inside the cavity body, the water outlet of the cavity body is connected to the solenoid valve of the brewing head assembly through a pipeline, and a compression spring is provided on the outer diameter of the piston push rod inside the cavity body; the piston push rod is driven up and down by the push rod connecting shaft and the stepping motor to adjust the distance between the push rod limiting platform of the piston push rod and the cavity limiting platform at the inner wall inside the cavity body. Thereby, the pressure value inside the cavity body of the pressure-changing valve group module is adjusted according to the distance between the push rod limit platform of the piston push rod and the cavity limit platform at the inner wall inside the cavity body; the outer diameter conical surface of the push rod limit platform at the above-mentioned piston push rod can also be provided with a corresponding sealing ring, or the piston push rod can be made of rubber to ensure the mutual sealing between the two.

[0005] The distance L between the piston push rod limiting platform and the cavity limiting platform at the inner wall inside the cavity body is set to 0.1-0.8mm.

[0006] A screw is arranged at the transmission shaft of the stepping motor, the external thread of the screw is connected with the internal thread hole at one end of the push rod connecting shaft, and the other end of the push rod connecting shaft is connected with the piston push rod as a whole.

[0007] The top opening of the cavity body from which one end of the piston push rod of the pressure-changing valve group module extends is provided with a sealed waterproof sealing ring sleeve, and at least one sealing ring is provided in the waterproof sealing ring sleeve.

[0008] The brewing head assembly is arranged on a square boss on the front side of the main body bracket, three platforms are arranged in the main body bracket from top to bottom, the stepper motor is arranged on the topmost platform in the main body bracket, the transformer valve group module is arranged on the second boss on the middle platform in the main body bracket below the stepper motor, and the water pump is arranged on the rectangular boss in the main body bracket below the transformer valve group module.

[0009] The solenoid valve of the brewing head assembly is a three-way solenoid valve, one of the ways of which is connected to the water receiving box through a pipeline, so that water in part of the pipeline can be directly discharged into the water receiving box through the three-way solenoid valve.

[0010] The water pump is provided with a three-way safety valve, and the pipeline of the safety valve is respectively communicated with the water pump, the water tank sealing ring bracket assembly, and the pressure-changing valve group module.

[0011] A convex point is provided on one side of the outer diameter of the push rod connecting shaft, and a corresponding micro switch is provided in the main body bracket corresponding to the convex point. When the push rod connecting shaft is rotated to the gear position of the initial extraction pressure by the stepping motor, the convex point on the outer diameter of the push rod connecting shaft triggers the micro switch. In this way, the extraction pressure can be further monitored in real time, and the adjustment angle range can also be set by the number of turns of the outer diameter of the push rod connecting shaft. Each certain number of turns is one gear, and trigger points with different heights are set at corresponding positions to trigger the corresponding micro switch.

[0012] The utility model has reasonable structural design, convenient production and operation, wide application range, and is particularly convenient for adjusting and setting the extraction pressure; the utility model is suitable for use as a monitoring variable pressure coffee machine and a further improvement of similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model, and the dotted line in the figure is the internal structure of the main frame.

[0014] Figure 2 yes Figure 1 Schematic diagram of the main structure.

[0015] Figure 3 yes Figure 1 Schematic diagram of the explosion structure.

[0016] Figure 4 yes Figure 1 A schematic diagram of the cross-sectional structure, in which part A is framed and the dotted line is the push rod connecting shaft and the moving position of the piston push rod.

[0017] Figure 5 yes Figure 4 Enlarged view of part A.

[0018] Figure 6 yes Figure 2 Schematic diagram of the improved structure of the push rod connecting shaft.

[0019] Figure 7 It is a block diagram of the working principle of the utility model.

[0020] Serial number and name of the accompanying drawings: 1. Stepper motor, 2. Main bracket, 3. Brewing head assembly, 4. Water collecting box, 5. Water tank, 6. Water pump, 601, safety valve, 7. Transformer valve group module, 8. Flow meter, 9. Water tank sealing ring bracket assembly, 10. Push rod connecting shaft, 11. Sealing ring, 12. Waterproof sealing ring sleeve, 13. Compression spring, 14. Piston push rod, 1401, push rod limiting platform, 15. Cavity body, 1501, Cavity limiting platform, 1502, Water outlet, 16. Micro switch. Implementation

[0021] Now, in conjunction with the accompanying drawings, the structure and use of the utility model are further described. Figure 1-Figure 5 As shown, the coffee machine is provided with a main body support 2 in the body, a water tank 5 is provided at the rear of the main body support, a water receiving box 4 is provided below the brewing head assembly 3 on the front side of the main body support, and the water in the water tank passes through the water tank sealing ring support assembly 9 in the main body support and enters the water pump 6 in the main body support, and then flows into the brewing head assembly and is discharged from the pressure-changing valve group module 7 in the main body support, and the flow meter 8 in the main body support is connected to the water tank sealing ring support assembly and the water pump through pipelines. Its specific structure is as follows: a stepper motor 1 is provided at the top of the main body support above the pressure-changing valve group module, and the transmission shaft of the stepper motor extending into the main body support is connected to the extended end of the piston push rod 14 of the pressure-changing valve group module through a push rod connecting shaft 10, and the push rod connecting shaft is a coupling, and the other end of the piston push rod in the pressure-changing valve group module is a tower-shaped push rod limiting platform 1401, and the cavity body 15 of the pressure-changing valve group module The cavity body bottom inner wall corresponding to the push rod limiting platform is provided with a cavity limiting platform 1501, and the cavity body 15 of the pressure-changing valve group module is provided with a cavity limiting platform 1501. The inner wall conical surface of the body limit platform corresponds to and is aligned with the outer diameter conical surface of the push rod limit platform. A water outlet 1502 is provided on one side above the cavity limit platform inside the cavity body. The water outlet of the cavity body is connected to the solenoid valve of the brewing head assembly through a pipeline. A compression spring 13 is provided on the outer diameter of the piston push rod inside the cavity body. The piston push rod is driven up and down by the push rod connecting shaft and the stepper motor to adjust the distance between the push rod limit platform of the piston push rod and the cavity limit platform at the inner wall inside the cavity body. The distance L between the push rod limit platform of the piston push rod and the cavity limit platform at the inner wall inside the cavity body is set to 0.1-0.8mm.

[0022] The transmission shaft of the stepper motor is provided with a screw, the external thread of the screw is connected to the internal thread hole at one end of the push rod connecting shaft, and the other end of the push rod connecting shaft is connected to the piston push rod through a pin shaft; the top opening of the cavity body from which the piston push rod of the pressure-changing valve group module extends out is provided with a sealed waterproof sealing ring sleeve 12, and at least one sealing ring 11 is provided in the waterproof sealing ring sleeve. The brewing head assembly is arranged on a square boss on the front side of the main body bracket, and three platforms are arranged from top to bottom in the main body bracket. The stepper motor is arranged on the top platform in the main body bracket, the pressure-changing valve group module is arranged on the second boss of the middle platform in the main body bracket below the stepper motor, and the water pump is arranged on the rectangular boss in the main body bracket below the pressure-changing valve group module. The solenoid valve of the brewing head assembly is a three-way solenoid valve, and one of the three-way solenoid valves is connected to the water receiving box through a pipeline. The water pump is provided with a three-way safety valve 601, and the pipelines of the safety valve are respectively connected to the water pump, the water tank sealing ring bracket assembly, and the pressure-changing valve group module.

[0023] According to the above structural characteristics, a square boss is provided on the front side of the main support of the coffee machine, a circular opening is provided in the center of the square boss, four small bosses are provided around the opening, and a cylindrical screw column is provided on each of the four small bosses, which corresponds to the four screw holes of the brewing head assembly and is installed on the brewing head assembly; a water receiving box is provided at the lower front side of the main support to receive waste water after extraction pressure relief, three platforms are provided from top to bottom in the main support, four screw holes are provided on the top platform to fix the stepper motor, and two screw holes are provided on the lower platform to fix the transformer valve group module, a circular opening is provided on the front panel of the main support to receive the water outlet of the transformer valve group module, and a rectangular boss is provided further downward, and four screw columns are provided on the rectangular boss to fix the water pump, and two screw columns are provided on the second boss above the rectangular boss on the rear side of the main support to fix the water tank sealing ring bracket assembly; a water tank is provided at the back of the main support, and a one-way valve at the water outlet at the bottom of the water tank is connected to the transformer valve group module. A semicircular bracket is provided on the left and right sides of the cavity body of the water tank sealing ring bracket assembly, and the bracket is respectively provided with screw holes corresponding to the screw holes of the second boss; a cylindrical raised water outlet is provided on the front side of the cavity body, a cavity limiting platform is provided inside the cavity body, a piston push rod is provided inside the cavity body, the front section of the piston push rod is tower-shaped, and is provided with a push rod limiting platform corresponding to the cavity limiting platform inside the cavity body, the piston push rod is sleeved with a compression spring, an embedded cylindrical waterproof sealing ring sleeve is provided on the top of the cavity body, a circular opening is provided in the middle of the waterproof sealing ring sleeve, the top of the piston push rod is provided with a push rod connecting shaft, the piston push rod is fixed to the push rod connecting shaft, and a female thread is provided inside the upper end of the push rod connecting shaft, which is connected to the male thread of the stepping motor rotating rod.

[0024] Further, according to the above structural characteristics, Figure 6As shown, a convex point is provided on one side of the outer diameter of the above-mentioned push rod connecting shaft, and a corresponding micro switch 16 is provided in the main body bracket corresponding to the convex point. When the push rod connecting shaft is rotated to the gear position of the initial extraction pressure by the stepper motor, the convex point on the outer diameter of the push rod connecting shaft triggers the micro switch.

[0025] like Figure 7 As shown, the specific operation steps of the coffee machine are as follows: First, select the button corresponding to the required extraction pressure (four gears of 3bar, 6bar, 9bar and 12bar) in the program of the coffee machine, instruct the water pump to pump water from the water tank, and the water passes through the flow meter and the water pump to reach the variable pressure valve group module. During this process, the stepper motor starts to rotate clockwise to drive the piston push rod of the water tank sealing ring bracket assembly to move forward or backward. The water flow pressure is controlled by changing the gap between the push rod limit platform 1401 of the piston push rod and the cavity limit platform 1501 at the inner wall of the cavity body, so as to achieve the purpose of controlling the extraction pressure during the extraction process (the smaller the gap, the greater the water flow, the greater the extraction pressure, and the larger the gap, the greater the water flow, the greater the extraction). The above-mentioned stepper motor rotates clockwise to increase the pressure, and counterclockwise to decrease the pressure. In this process, the pressure is monitored in real time through each step taken by the stepper motor and the expansion and contraction of the compression spring (the number of steps, the expansion and contraction distance and the pressure are set in the initial program). The distance L between the piston push rod limiting platform and the cavity limiting platform at the inner wall inside the cavity body is set to 0.1-0.8mm.

[0026] In summary, the core mechanism of the coffee machine is a coffee machine mechanism that monitors the extraction pressure in real time and controls the extraction pressure to meet the needs of different users; that is, a coffee machine mechanism that controls the extraction pressure, specifically a mechanism that monitors the pressure in real time and has a pressure-changing function. The coffee machine has the following features: 1) controllable extraction pressure; 2) real-time control of the stepper motor and water pump; 3) the screw of the stepper motor drives the piston push rod to move up and down; 4) the forward and reverse steps of the stepper motor monitor the pressure change.

Claims

1. A monitoring variable pressure coffee machine, wherein a main body support (2) is provided in the body of the coffee machine, a water tank (5) is provided at the rear of the main body support, a water receiving box (4) is provided below the brewing head assembly (3) on the front side of the main body support, water in the water tank passes through a water tank sealing ring support assembly (9) in the main body support and enters a water pump (6) in the main body support, and then flows into the brewing head assembly through a variable pressure valve group module (7) in the main body support and is discharged, and a flow meter (8) in the main body support is connected to the water tank sealing ring support assembly and the water pump through pipelines respectively; characterized in that A stepper motor (1) is provided at the top of the main support (2) above the pressure-changing valve group module (7); a transmission shaft at the stepper motor extending into the main support is connected to an end of a piston push rod (14) of the pressure-changing valve group module via a push rod connecting shaft (10); the push rod connecting shaft is a coupling; the other end of the piston push rod in the pressure-changing valve group module is a tower-shaped push rod limiting platform (1401); a cavity limiting platform (1501) is provided on the inner wall of the bottom of the cavity body (15) of the pressure-changing valve group module corresponding to the push rod limiting platform The conical surface of the inner wall of the cavity limit platform corresponds to and is aligned with the conical surface of the outer diameter of the push rod limit platform; a water outlet (1502) is provided on one side above the cavity limit platform inside the cavity body; the water outlet of the cavity body is connected to the solenoid valve of the brewing head assembly (3) through a pipeline; a compression spring (13) is provided on the outer diameter of the piston push rod inside the cavity body; the piston push rod is driven to move up and down by the push rod connecting shaft and the stepping motor to adjust the distance between the push rod limit platform of the piston push rod and the cavity limit platform at the inner wall inside the cavity body.

2. The monitoring variable pressure coffee machine according to claim 1, characterized in that The distance L between the push rod limiting platform (1401) of the piston push rod (14) and the cavity limiting platform (1501) at the inner wall inside the cavity body (15) is set to 0.1-0.8 mm.

3. The monitoring variable pressure coffee machine according to claim 1, characterized in that A screw is provided at the transmission shaft of the stepping motor (1), the external thread of the screw is connected to the internal thread hole at one end of the push rod connecting shaft (10), and the other end of the push rod connecting shaft is connected to the piston push rod (14) as a whole.

4. The monitoring variable pressure coffee machine according to claim 1, characterized in that A top opening of the cavity body (15) extending from one end of the piston push rod (14) of the pressure-changing valve group module (7) is provided with a sealed waterproof sealing ring sleeve (12), and at least one sealing ring (11) is provided in the waterproof sealing ring sleeve.

5. The monitoring variable pressure coffee machine according to claim 1, characterized in that The brewing head assembly (3) is arranged on a square boss on the front side of the main frame (2); three platforms are arranged in the main frame from top to bottom; the stepping motor (1) is arranged on the topmost platform in the main frame; the pressure-changing valve group module (7) is arranged on the second boss on the middle platform in the main frame below the stepping motor; and the water pump (6) is arranged on the rectangular boss in the main frame below the pressure-changing valve group module.

6. The monitoring variable pressure coffee machine according to claim 1, characterized in that The solenoid valve of the brewing head assembly (3) is a three-way solenoid valve, one of the ways of the three-way solenoid valve is connected to the water receiving box (4) via a pipeline.

7. The monitoring variable pressure coffee machine according to claim 1, characterized in that The water pump (6) is provided with a three-way safety valve (601), and the pipeline of the safety valve is respectively connected to the water pump, the water tank sealing ring bracket assembly (9), and the pressure-changing valve group module (7).

8. The monitoring variable pressure coffee machine according to claim 1, characterized in that A convex point is provided on one side of the outer diameter of the push rod connecting shaft (10), and a corresponding micro switch (16) is provided in the main body bracket (2) corresponding to the convex point. When the push rod connecting shaft is rotated to the gear position of the initial extraction pressure by the stepping motor (1), the convex point on the outer diameter of the push rod connecting shaft triggers the micro switch.

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