Pressure relief device for a coffee machine brewing mechanism

Abstract

This utility model relates to a pressure relief device for the brewing mechanism of a coffee machine, addressing the technical problems of high production cost, inconvenient operation, and poor stability of existing pressure relief devices in the brewing mechanism of similar capsule coffee machines. The key feature is that the pressure head of this device is assembled in the central hole of the main body of the mechanism. A high-pressure water inlet is located at the center of one end of the piston in the piston chamber at the top of the pressure head. A converter is fixedly installed at one end of the support plate of the main body above the pressure head and on one side of the outer diameter of the top of the main body. A connecting rod is provided above the converter and connected to the handle. One end of the metal guide rod with a sealing ring is inserted into a protruding converter slot on one side of the converter via a converter spring. The other end of the metal guide rod extends out of the converter slot and abuts against the outer diameter of the pin at the other end of the connecting rod via the converter spring. A pressure relief hole B and a pressure inlet hole A are respectively located at the bottom of the converter slot and on the outer diameter of the converter on one side of the converter slot at the converter spring.

Description

Technical Field

[0001] This utility model relates to the brewing mechanism of a capsule coffee machine, specifically a pressure relief device for the brewing mechanism of a coffee machine. Background Technology

[0002] Coffee capsules are a pre-packaged form of ground coffee. Because the capsule walls are relatively hard, they retain their shape well under high temperatures, allowing high-pressure steam to be injected into them. This pressure causes the coffee to fully extract, resulting in a rich, concentrated espresso with crema, thus preserving the coffee's aroma and flavor. During capsule production, coffee beans are specially processed into ground coffee and then sealed in an aluminum foil capsule, similar to a "fruit jelly." The capsule is also filled with a non-toxic inert gas to extend shelf life and provide secondary sterilization. To brew coffee, simply place the capsule into a dedicated capsule coffee machine and press the brew button; no other operation is required. The advantages of coffee capsules are their simplicity, convenience, and consistent coffee quality. Currently, most coffee capsule brewing devices on the market are modifications of traditional pressure coffee makers, adding a filter to the handle assembly. However, these devices are cumbersome, lacking automatic discharge and collection of used capsules, requiring manual removal. For example, Chinese patent application number 201410393201.2, published on March 30, 2016, entitled "A Multifunctional Coffee Machine Brewing Device"; however, the above-mentioned products and similar products cannot effectively puncture coffee capsules, making operation laborious, cleaning troublesome, and inconvenient for users. Even newer machines that brew coffee capsules utilize complex mechanisms, but the coffee capsule positioning and release mechanisms are structurally complex, and the pressure relief mostly uses solenoid valves, which are not only costly but also have a high failure rate due to their complexity. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a pressure relief device for the brewing mechanism of a coffee machine, thereby solving the technical problems of high production cost, inconvenient operation, and poor stability of existing pressure relief devices in the brewing mechanism of similar capsule coffee machines. This objective is achieved through the following technical solution.

[0004] A pressure-relieving device for a coffee machine brewing mechanism includes a pressure head mounted in the central hole of the main body of the mechanism. Three or four pressure head return springs are equidistantly mounted below the bottom edge of the top opening of the pressure head within the main body. A piston V-shaped sealing ring is provided on the outer diameter of one end of the piston in the piston chamber at the top of the pressure head. A high-pressure water inlet is located at the center of the other end of the piston in the piston chamber at the top of the pressure head. A mushroom-shaped silicone cap in the bottom chamber of the pressure head is abutted against a top block mechanism protruding from the bottom chamber of the pressure head by a pressure spring. The top block mechanism is fixed to the center of the bottom of the pressure head by screws. A coffee drawer is guided by a drawer guide within the main body of the mechanism. The slot is assembled into the main body of the mechanism from the bottom or side of the cabinet body. The coffee cap above the coffee capsule cavity in the coffee drawer is assembled on the top of the coffee drawer and aligned with the top block mechanism on the bottom end face of the upper pressure head. The coffee capsule cavity in the coffee drawer is equipped with a piercing blade. High-pressure water entering through the high-pressure water inlet hole of the piston inside the pressure head pushes the pressure head to press the coffee cap on the lower coffee drawer. At the same time, the top block mechanism of the pressure head seals against the coffee cap. The liquid inlet hole of the coffee cap and the top block mechanism are connected to the through hole of the pressure head above the mushroom head silicone, and the liquid outlet hole at the bottom of the coffee drawer is connected to the high-pressure water inlet hole of the piston. The key structural design features a converter fixed to one end of the support plate of the main body of the mechanism above the pressure head and one side of the top outer diameter of the main body. At the same time, the downward-bent corner of one end of the handle above the converter is hinged to the converter via a first rotating shaft. Simultaneously, the downward-bent end of the handle is hinged to one end of the connecting rod via a second rotating shaft. The two ends of the second rotating shaft are respectively inserted into the oblique holes on both sides of the converter. One end of the metal guide rod, equipped with a sealing ring, is inserted into the protruding converter slot on one side of the converter via a converter spring. The other end of the metal guide rod extends out of the converter slot and abuts against the outer diameter of the pin at the other end of the connecting rod via the converter spring. A pressure relief hole B and a pressure inlet hole A are respectively provided at the bottom of the converter slot and on one side of the converter slot near the converter spring. The metal guide rod in the converter slot opens or closes the pressure inlet hole A via the reciprocating motion of the converter spring. The pressure relief hole B and the pressure inlet hole A are connected to the high-pressure water inlet hole at the top of the piston via pipes and a tee fitting.

[0005] When the handle is closed and the metal guide rod is pushed, the pressure inlet A is closed, and there is no communication between pressure inlet A and pressure relief hole B. When the handle is opened, the converter spring pushes the metal guide rod to reset, at which point pressure inlet A opens, and pressure inlet A and pressure relief hole B are connected to achieve the pressure relief effect. When water is introduced, the piston, through the piston V-shaped sealing ring, pushes the pressure head downward to press the coffee cap on the coffee drawer. At the same time, the top block mechanism presses the pressure spring, and the pressure spring presses the mushroom-shaped silicone head and generates counter pressure at the bottom of the pressure head. During the above process, the pressure head reset spring plays the role of resetting the pressure head after the pressure relief mechanism is opened. At the same time, the above-mentioned pressure relief device includes a brewing mechanism and a pressure relief mechanism. The brewing mechanism is composed of components inside the brewing main body and the pressure head, realizing a device with small space requirements. The pressure relief mechanism consists of a converter, a first rotating shaft, a second rotating shaft, a connecting rod, a converter spring, a metal guide rod, a sealing ring, and a handle.

[0006] The support plate is in the shape of a door, and the other end of the support plate is snapped to the circumferential surface of both sides of the main body of the mechanism. The pressure head is set in the center hole of the main body of the mechanism below the support plate of the converter.

[0007] The high-pressure water inlet at the center of the piston top is aligned with the pipe connection hole of the upper support plate.

[0008] One end of the pressure head return spring, located below the bottom edge of the outer diameter of the pressure head's top orifice, is fitted into a spring post inside the central hole at the top of the main body of the mechanism. The other end of the pressure head return spring is fitted into and confined within a spring groove below the bottom edge of the outer diameter of the pressure head's top orifice. The spring posts and spring grooves can also be arranged in opposite directions at the bottom of the central hole at the top of the pressure head and the main body of the mechanism, as needed.

[0009] The pressure head has an open guide groove on at least one side below the bottom edge of the outer diameter of the top orifice, and the guide groove of the pressure head is inserted into the guide rib protruding from the inner wall of the top center hole inside the main body of the mechanism.

[0010] The coffee capsule cavity of the coffee drawer has an upper coffee piercing blade and a lower coffee piercing blade. The upper coffee piercing blade is fixed to the coffee cap above the coffee capsule cavity inside the coffee drawer, and the lower coffee piercing blade is assembled at the bottom of the coffee capsule cavity inside the coffee drawer. One side of the coffee cap is hinged and fixed to the shell on one side of the coffee capsule cavity inside the coffee drawer.

[0011] This utility model has a reasonable and simple structural design, is easy to operate, has low cost, and low failure rate; it is suitable as a pressure relief device for the brewing mechanism of a coffee machine, as well as a structural improvement of similar products. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention under pressure in use.

[0013] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure.

[0014] Figure 3 yes Figure 2 A schematic diagram of the handle in the open state.

[0015] Figure 4 yes Figure 3 A cross-sectional view of the structure, showing the depressurized state.

[0016] Figure 5 This is a partial exploded structural diagram of the present invention, with the corresponding spring omitted from the diagram.

[0017] Attached Figures and Their Names: 1. Handle, 2. First Rotating Shaft, 3. Support Plate, 301. Pipe Connection Hole, 4. Main Body of Mechanism, 401. Spring Column, 402. Guide Rib, 5. Pressure Head, 501. Spring Groove, 502. Guide Groove, 6. Piston, 601. High-Pressure Water Inlet, 7. Pressure Head Return Spring, 8. Coffee Drawer, 9. Coffee Cap, 10. Upper Coffee Puncture, 11. Lower Coffee Puncture, 12. Second Rotating Shaft, 13. Connecting Rod, 1301. Pin, 14. Converter Spring, 15. Metal Guide Rod, 16. Sealing Ring, 17. Converter, 1701. Angled Hole, 1702. Converter Hole Groove, 18. Mushroom-Shaped Silicone, 19. Piston V-Shaped Sealing Ring, 20. Pressure Spring, 21. Top Block Mechanism, A is the Pressure Inlet Hole, B is the Pressure Relief Hole. Implementation

[0018] The structure and use of this utility model will now be further described with reference to the accompanying drawings. Figures 1-5As shown, the pressure head 5 of the pressure relief device is assembled in the central hole of the main body 4. Three pressure head return springs 7 are equidistantly installed below the bottom edge of the outer diameter of the top hole of the pressure head inside the main body of the mechanism. A piston V-shaped sealing ring 19 is provided on the outer diameter of one end of the piston 6 assembled in the piston chamber at the top of the pressure head. A high-pressure water inlet hole 601 is provided at the center of the other end of the piston in the piston chamber at the top of the pressure head. The mushroom-shaped silicone rubber 18 in the bottom chamber of the pressure head is abutted against the top block mechanism 21 protruding from the bottom chamber of the pressure head by the pressure spring 20. The top block mechanism is fixed to the bottom of the pressure head by screws. In the middle of the unit, the coffee drawer 8 is assembled into the main body of the unit from the bottom or side through the drawer guide groove of the main body of the unit. The coffee cap above the coffee capsule cavity in the coffee drawer is assembled to the top of the coffee drawer and aligned with the top block mechanism at the bottom end of the upper pressure head. The upper coffee piercing 10 in the coffee capsule cavity of the coffee drawer is fixed to the coffee cap above the coffee capsule cavity in the coffee drawer, and the lower coffee piercing 11 is assembled to the bottom of the coffee capsule cavity in the coffee drawer. One side of the coffee cap is hinged to the housing on one side of the coffee capsule cavity in the coffee drawer. High-pressure water entering through the high-pressure water inlet hole of the piston inside the pressure head pushes the pressure head to press the coffee cap on the lower coffee drawer. At the same time, the top block mechanism of the pressure head seals against the coffee cap. The liquid inlet hole of the coffee cap and the top block mechanism is connected to the through hole of the pressure head above the mushroom head silicone, and the liquid outlet hole at the bottom of the coffee drawer is connected to the high-pressure water inlet hole of the piston.

[0019] A converter 17 is fixedly installed on one end of the support plate 3 of the main body of the mechanism above the pressure head and on one side of the top outer diameter of the main body of the mechanism. At the same time, the downward bend of one end of the handle 1 above the converter is hinged to the converter through the first rotating shaft 2. The downward bend of the handle is hinged to one end of the connecting rod 13 through the second rotating shaft 12. The two ends of the second rotating shaft are respectively inserted into the inclined holes 1701 on both sides of the converter. One end of the metal guide rod 15 with a sealing ring 16 is inserted into the converter hole groove 1702 on one side of the converter through the converter spring 14. The other end of the metal guide rod extends out of the converter hole groove of the converter and abuts against the outer diameter of the pin 1301 at the other end of the connecting rod through the converter spring. The bottom of the converter hole groove of the converter and the outer diameter of the converter on one side of the converter hole groove of the converter spring are respectively provided with a pressure relief hole B and a pressure inlet hole A. The metal guide rod in the converter hole groove of the converter opens or closes the pressure inlet hole A through the reciprocating motion of the converter spring. The pressure relief hole B and the pressure inlet hole A of the converter are connected to the high-pressure water inlet hole on the top of the piston through pipes and tee fittings.

[0020] The aforementioned support plate is U-shaped, with one end snapped to the circumference of both sides of the main body of the mechanism. The pressure head is positioned within the central hole of the main body of the mechanism below the support plate of the converter. The high-pressure water inlet at the center of the piston top is aligned with the pipe connection hole 301 of the upper support plate. One end of the pressure head return spring below the bottom edge of the outer diameter of the pressure head top opening is fitted into the spring post 401 in the central hole at the top of the main body of the mechanism, while the other end of the pressure head return spring is fitted into and confined to the spring groove 501 below the bottom edge of the outer diameter of the pressure head top opening. Symmetrically open guide grooves 502 are provided on both sides below the bottom edge of the outer diameter of the pressure head top opening, and the guide grooves of the pressure head are inserted into the protruding guide ribs 402 on the inner wall of the central hole at the top of the main body of the mechanism.

[0021] The main effects of this pressure relief device are as follows: 1) In the pressure relief mechanism, A of the converter is the pressure inlet and B is the pressure relief outlet. When the handle is closed and the metal guide rod is pushed, the pressure inlet A is closed, and the pressure inlet A and the pressure relief outlet B are not interconnected. When the handle is opened, the converter spring pushes the metal guide rod to reset, and the pressure inlet A is opened, and the pressure inlet A and the pressure relief outlet B are interconnected to achieve the pressure relief effect. 2) In the brewing mechanism, the support plate and the main body of the mechanism play a supporting and fixing role. The piston is fixed on the support plate and assembled inside the pressure head. When water is introduced, the piston pushes the pressure head downward to press the coffee cap on the coffee drawer through the piston V-shaped sealing ring. At the same time, the top block mechanism presses the pressure spring, and the pressure spring presses the mushroom head silicone and generates a counter pressure at the bottom of the pressure head. In the above process, the pressure head reset spring plays the role of resetting the pressure head after the pressure relief mechanism is opened.

[0022] The brewing mechanism and working principle of this pressure relief device are as follows: When the handle of the pressure relief mechanism is closed, the pressure is released, and the high-pressure water pushes the pressure head to press the coffee lid on the coffee drawer. When the handle is opened, the pressure is released, and the pressure head returns to its original position. The two mechanisms work together to facilitate coffee extraction and brew an enticingly aromatic coffee.

[0023] In summary, this pressure relief device adds a pressure relief mechanism to the brewing mechanism of existing similar products. The pressure relief mechanism's converter, along with a first rotating shaft, a second rotating shaft, a connecting rod, a converter spring, a metal guide rod, a sealing ring, and a handle connection, enables pressure relief operations by moving the pressure head up and down. This pressure relief device has a simple structure, is easy to operate, has low cost, and a low failure rate. It allows for pressure relief immediately after coffee brewing by opening the handle, providing a low-cost solution for quickly reducing pressure within the brewing chamber after brewing, perfectly replacing the high-cost solenoid valve. Simultaneously, it ensures thorough coffee extraction, resulting in a richer, more concentrated coffee and improved coffee quality.

[0024] The above description is intended to illustrate the technical means of this utility model and is not intended to limit the technical scope of this utility model. Based on the above structural features, any obvious improvements made to this utility model by those skilled in the art in conjunction with existing common knowledge also fall within the protection scope of the claims of this utility model.

Claims

1. A pressure relief device for a coffee machine brewing mechanism, wherein the pressure head (5) of the pressure relief device is assembled in the central hole of the main body (4) of the mechanism, and three or four pressure head return springs (7) are equidistantly mounted below the bottom edge of the outer diameter of the top hole of the pressure head inside the main body of the mechanism. A piston V-shaped sealing ring (19) is provided on the outer diameter of one end of the piston (6) assembled in the piston chamber at the top of the pressure head, and a high-pressure water inlet hole (601) is provided at the center of the other end of the piston in the piston chamber at the top of the pressure head. The mushroom-shaped silicone rubber (18) in the bottom chamber of the pressure head abuts against the top block mechanism (21) protruding from the bottom chamber of the pressure head through the pressure spring (20). The top block mechanism is fixedly set in the middle of the bottom of the pressure head by screws. The drawer (8) is assembled into the main body of the cabinet from the bottom or side through the drawer guide groove of the main body of the mechanism. The coffee cap (9) above the coffee capsule cavity in the coffee drawer is assembled on the top of the coffee drawer and aligned with the top block mechanism at the bottom end of the upper pressure head. The coffee capsule cavity of the coffee drawer is provided with a piercing blade. The high-pressure water entering through the high-pressure water inlet hole of the piston inside the pressure head pushes the pressure head to press the coffee cap on the lower coffee drawer. At the same time, the top block mechanism of the pressure head seals against the coffee cap. The liquid inlet hole of the coffee cap and the top block mechanism is connected to the through hole of the pressure head above the mushroom head silicone, and the liquid outlet hole at the bottom of the coffee drawer is connected to the high-pressure water inlet hole of the piston. A converter (17) is fixedly installed on one end of the support plate (3) of the main body (4) above the pressure head (5) and on one side of the top outer diameter of the main body. At the same time, the downward bend of one end of the handle (1) above the converter is hinged to the converter through the first rotating shaft (2). The downward bend of the handle is hinged to one end of the connecting rod (13) through the second rotating shaft (12). The two ends of the second rotating shaft are respectively inserted into the oblique holes (1701) on both sides of the converter. The end of the metal guide rod (15) with the sealing ring (16) is inserted into the converter through the converter spring (14). Inside the converter slot (1702) with a protrusion on one side, the other end of the metal guide rod extends out of the converter slot and abuts against the outer diameter of the pin (1301) at the other end of the connecting rod through the converter spring; the bottom of the converter slot and the outer diameter of the converter on one side of the converter slot at the converter spring are respectively provided with a pressure relief hole B and a pressure inlet hole A. The metal guide rod in the converter slot opens or closes the pressure inlet hole A through the reciprocating motion of the converter spring. The pressure relief hole B and the pressure inlet hole A of the converter are connected to the high-pressure water inlet hole (601) on the top of the piston through pipes and tee fittings.

2. The pressure relief device for the coffee machine brewing mechanism according to claim 1, characterized in that... The support plate (3) is in the shape of a door, and the other end of the support plate is fastened to the circumferential surface on both sides of the main body of the mechanism (4). The pressure head (5) is located in the center hole of the main body of the mechanism below the support plate of the converter.

3. The pressure relief device for the coffee machine brewing mechanism according to claim 1, characterized in that... The high-pressure water inlet (601) at the top center of the piston (6) is aligned with the pipe connection hole (301) of the upper support plate (3).

4. The pressure relief device for the coffee machine brewing mechanism according to claim 1, characterized in that... One end of the pressure head reset spring (7) below the bottom edge of the outer diameter of the top orifice of the pressure head (5) is respectively fitted into the spring column (401) in the top center hole of the main body (4), and the other end of the pressure head reset spring is respectively fitted into and limited to the spring groove (501) below the bottom edge of the outer diameter of the top orifice of the pressure head.

5. The pressure relief device for the coffee machine brewing mechanism according to claim 4, characterized in that... The pressure head (5) has a guide groove (502) with an opening on at least one side below the bottom edge of the top orifice. The guide groove of the pressure head is inserted into the guide rib (402) protruding from the inner wall of the top center hole of the main body (4) of the mechanism.

6. The pressure relief device for the coffee machine brewing mechanism according to claim 1, characterized in that... The coffee capsule cavity piercing blade of the coffee drawer (8) is a coffee upper piercing (10) and a coffee lower piercing (11). The coffee upper piercing is fixed to the coffee cap (9) above the coffee capsule cavity in the coffee drawer. The coffee lower piercing is assembled at the bottom of the coffee capsule cavity in the coffee drawer. One side of the coffee cap is hinged to the shell on one side of the coffee capsule cavity in the coffee drawer.

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