Beverage dispensing device

Abstract

This invention provides a beverage extraction device that overcomes the inconvenience of assembling the upper hammer in the extraction device and the problem of beverage contamination caused by the pressure holding structure. [Solution] The upper hammer comprises a support member 1 and an operating assembly. The lower part of the support member is a cup-shaped body with a bottom wall. At least two blind screw holes 2-1 are arranged at equal intervals in the circumferential direction around the axis of the operating assembly. The bottom wall of the support member is provided with deformed elongated holes corresponding to the blind screw holes. In each deformed elongated hole, the inner diameter of the large-diameter hole is larger than the outer diameter of the head 3-1 of the mounting screw 3, and the inner diameter of the small-diameter hole is larger than the outer diameter of the shaft portion 3-2 of the mounting screw, but smaller than the outer diameter of the head. The upper end surface of the small-diameter hole is lower than the upper end surface of the large-diameter hole, and a projection is provided above the upper end surface of the small-diameter hole to restrict the movement of the head of the mounting screw. The mounting screw is pre-screwed into the blind screw hole to about half its depth, and rotated so that the head passes through the large-diameter hole and the shaft is positioned inside the small-diameter hole.

Description

Technical Field

[0001] This utility model relates to the technical field of beverage manufacturing equipment, and particularly to a beverage extraction device.

Background Art

[0002] All kinds of beverage extraction devices follow the same principle of performing compression and extraction by using the relative displacement between a piston and an extraction cylinder, but their structures are quite different. The major differences include the driving method and the residue discharge method, and the minor differences include the water inlet structure and the liquid outlet structure.

[0003] Generally, hot water is introduced into the extraction cylinder of an extraction device, and the extracted beverage flows out from a piston. Chinese Utility Model No. 219782271 discloses a "coffee extraction device" in which the extraction cylinder is movable and the upper hammer is fixed. The liquid outlet structure of the upper hammer is located on the axis of the upper hammer. The upper hammer comprises a support member for fixing and an operating assembly that can engage with the inner wall of the extraction cylinder. The part of the operating assembly that engages with the extraction cylinder is disc-shaped. Since the liquid outlet structure must be located on the axis of the upper hammer, the operating assembly can only be fixed to the support member by screws arranged circumferentially around the axis. The support member is cup-shaped, and the screws need to penetrate downwards through the bottom wall of the support member before being screwed into the operating assembly. However, this document does not disclose a specific structure for fixing the operating assembly to the support member. Under conventional structures and operations, attaching and fixing screws to the bottom wall inside the cup-shaped body presents the problem of a cumbersome operation. Furthermore, to maintain and regulate the pressure within the extraction chamber, the liquid outlet structure of the upper hammer in this document is shown in Figure 5 to include a pressure-retaining knob 8 screwed into the hammer head 7. The hammer head 7 is made of plastic, and the pressure-retaining knob 8 is made of metal. As a result, when the pressure-retaining knob 8 is screwed into the threaded hole of the hammer head 7, detached or easily detached plastic particles are scraped off the threaded surface. The flowing beverage permeates and immerses itself in this threaded area, and the beverage becomes contaminated by these plastic particles. [Overview of the Initiative]

[0004] The technical problem that this utility model aims to solve is to provide a beverage extraction device that overcomes the inconvenience of assembling the upper hammer and the problem of beverage contamination caused by the pressure holding structure in existing extraction devices.

[0005] The technical solution adopted by this utility model to solve the above technical problems is as follows: A beverage extraction device comprising a frame and an upper hammer fixed to the frame, wherein the upper hammer, an upwardly movable cylinder, and a lower hammer can form an extraction chamber, the upper hammer is provided with a liquid outlet structure for discharging the beverage, the upper hammer has a support member fixed to the frame and an operating assembly coaxially mounted below the support member, the operating assembly being able to engage with the inner wall of the cylinder, The lower part of the support member is a cup-shaped body with a bottom wall, and at least two blind screw holes are evenly spaced circumferentially around the axis of the operating assembly. The bottom wall of the support member is provided with at least two deformed elongated holes corresponding to the blind screw holes, each of which has a large diameter hole and a small diameter hole communicating radially with each other. The operating assembly is mounted below the support member in such a structure that the distance from the axis of the large diameter hole to the axis of the support member, the distance from the axis of the small diameter hole to the axis of the support member, and the distance from the axis of the blind screw hole to the axis of the operating assembly are all equal. A mounting screw is provided, and the mounting screw has a head and a shaft. In the case of a deformed elongated hole, the inner diameter of the large diameter hole is larger than the outer diameter of the mounting screw head, and the inner diameter of the small diameter hole is larger than the outer diameter of the mounting screw shaft but smaller than the outer diameter of the mounting screw head. The upper end surface of the small-diameter hole in the deformed elongated hole is lower than the upper end surface of the large-diameter hole, and a projection is provided above the upper end surface of the small-diameter hole in the deformed elongated hole to restrict the movement of the mounting screw head toward the large-diameter hole. The mounting screws are pre-screwed into the blind screw holes of the operating assembly to about half their depth, then the heads of the mounting screws on the operating assembly side are passed through the larger diameter holes of the deformed elongated holes, the operating assembly is rotated by an angle so that the shafts of the mounting screws are positioned in the smaller diameter holes, and then the mounting screws are tightened using a tool above the cup-shaped body of the support member, thereby fixing the operating assembly to the support member.

[0006] Specifically, in order to improve sealing performance and facilitate the installation of the seal ring, the operating assembly comprises an upper engaging member, a lower engaging member, and a seal ring that makes sealing contact with the inner wall of the cylinder, wherein the upper engaging member has an annular lower end surface that presses the seal ring downward, and the lower engaging member has an annular upper end surface that presses the seal ring upward.

[0007] Specifically, the lower engaging member is provided with a retaining screw hole, and the upper engaging member has a through hole for accommodating a portion of the shaft of the mounting screw.

[0008] Specifically, in order to achieve extraction under pressure and thereby improve the extraction results, a pressure-holding assembly is provided in the axial hole of the lower engaging member, the axis of the pressure-holding assembly coincides with the axis of the operating assembly, the pressure-holding assembly comprises a pressure-holding sheet, a pressure-holding core, and a spring arranged coaxially from bottom to top, the pressure-holding sheet is fixed to the lower engaging member and exposed to the lower end surface of the lower engaging member, the pressure-holding sheet is a cup-shaped body with an upward opening, a liquid outlet hole is provided at the bottom of the pressure-holding sheet, the pressure-holding core is located in the internal cavity of the pressure-holding sheet, the lower end of the spring presses against the pressure-holding core and the upper end presses directly or indirectly against the stepped surface of the axial hole of the lower engaging member, the pressure-holding core seals the upper opening of the liquid outlet hole.

[0009] Specifically, the pressure inside the extraction chamber can be changed by replacing relatively small components. The upper end of the spring indirectly presses against the stepped surface of the axial hole of the lower engaging member, and a hollow adjustment element is provided between the upper end of the spring and the stepped surface of the axial hole of the lower engaging member. By replacing the hollow adjustment element with one of a different axial length, the pressure applied to the pressure-holding core by the spring can be changed.

[0010] Specifically, the pressure-retaining sheet fits snugly into the axial hole of the lower engaging member.

[0011] Specifically, the operating assembly further comprises a filter screen cover having a filter screen, the filter screen cover being screwed onto a lower engaging member and positioned below the liquid outlet hole.

[0012] The beverage extraction device of this utility model has the following beneficial effects. Firstly, by providing a deformed elongated hole in the support member of the upper hammer, the mounting screws can be pre-attached to the operating assembly before the operating assembly is fixed to the support member, simplifying assembly. A projection provided above the small-diameter hole of each deformed elongated hole restricts the movement of the mounting screw head, preventing the operating assembly from rotating in the reverse direction and detaching from the support member. Secondly, by providing a replaceable hollow pressure adjustment element in the pressure holding assembly, the holding pressure value can be adjusted by replacing this part without using a screw-type pressure regulator, thereby preventing contamination of beverages by plastic particles from the screw threads.

[0013] To more clearly explain the embodiments of this utility model or the technical solutions in the prior art, the necessary drawings for use in describing the embodiments or the prior art are briefly introduced below. It is clear that the drawings described below represent only a part of the embodiments described in this application. Those skilled in the art will be able to obtain other drawings based on these drawings without any creative effort. [Brief explanation of the drawing]

[0014] [Figure 1] This is a front view of the utility model. [Figure 2] This is a cross-sectional view along line AA in Figure 1. [Figure 3] This is an enlarged view of section B in Figure 2. [Figure 4] This is an exploded view of a part of the support member and operating assembly of this utility model. [Figure 5] This is a schematic diagram of the support member of this utility model. [Modes for carrying out the invention]

[0015] To further clarify the purpose, technical solutions, and advantages of the embodiments of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described with reference to the accompanying drawings of the embodiments of this utility model. It will be clear that the embodiments described are not all but part of the embodiments of this utility model. All other embodiments that can be obtained by a person skilled in the art without creative effort based on the embodiments of this utility model will fall within the scope of protection of this utility model.

[0016] As shown in Figures 1 and 2, the beverage dispensing device comprises a frame and an upper hammer fixed to the frame. The upper hammer, an upwardly movable cylinder, and a lower hammer can form an extraction chamber. The upper hammer is provided with a liquid outlet structure for dispensing the beverage. Referring to Figure 3, the upper hammer comprises a support member 1 fixed to the frame and an operating assembly 2 coaxially mounted below the support member 1. The operating assembly 2 is engageable with the inner wall of the cylinder. The structure for mounting the operating assembly 2 below the support member 1 is as follows: The lower part of the support member 1 is a cup-shaped body having a bottom wall 1-1. As shown in the schematic diagrams of the components in Figures 4 and 5, two blind screw holes 2-1 are evenly spaced circumferentially around the axis of the operating assembly 2. The bottom wall 1-1 of the support member 1 is provided with two deformed elongated holes 1-2 corresponding to the blind screw holes 2-1. As shown in Figure 5, each deformed elongated hole 1-2 includes a large diameter hole 1-2-1 and a small diameter hole 1-2-2 that communicate radially with each other. The radially communicating structure is such that the two tangents of the arc of the small diameter hole 1-2-2 extend simultaneously into the large diameter hole 1-2-1. The distance from the axis of the large diameter hole 1-2-1 to the axis of the support member 1, the distance from the axis of the small diameter hole 1-2-2 to the axis of the support member 1, and the distance from the axis of the blind screw hole 2-1 to the axis of the operating assembly 2 are all equal.

[0017] A mounting screw 3 is provided, and the mounting screw 3 has a head 3-1 and a shaft 3-2. With respect to the deformed elongated hole 1-2, the inner diameter of the large diameter hole 1-2-1 is larger than the outer diameter of the head 3-1 of the mounting screw 3, and the inner diameter of the small diameter hole 1-2-2 is larger than the outer diameter of the shaft 3-2 of the mounting screw 3, but smaller than the outer diameter of the head 3-1 of the mounting screw 3.

[0018] Continuing to refer to Figure 5, the upper end surface of the small-diameter hole 1-2-2 of the deformed elongated hole 1-2 is lower than the upper end surface of the large-diameter hole 1-2-1, and a projection 1-3 is provided above the upper end surface of the small-diameter hole 1-2-2 of the deformed elongated hole 1-2 to restrict the movement of the head 3-1 of the mounting screw 3 toward the large-diameter hole 1-2-1.

[0019] The mounting screw 3 is pre-screwed into the blind screw hole 2-1 of the operating assembly 2 to about half its depth, then the head 3-1 of the mounting screw 3 on the operating assembly 2 side is passed through the large diameter hole 1-2-1 of the deformed elongated hole 1-2, and the operating assembly 2 is rotated by an angle so that the shaft portion 3-2 of the mounting screw 3 is positioned inside the small diameter hole 1-2-2, and then the mounting screw 3 is tightened using a tool above the cup-shaped body of the support member 1, thereby fixing the operating assembly 2 to the support member 1.

[0020] Regarding the specific structure, the operating assembly 2 comprises an upper engaging member 2-2, a lower engaging member 2-3, and a seal ring 2-4 that makes sealing contact with the inner wall of the cylinder. The upper engaging member 2-2 has an annular lower end surface that presses the seal ring 2-4 downward, and the lower engaging member 2-3 has an annular upper end surface that presses the seal ring 2-4 upward.

[0021] A blind screw hole 2-1 is provided in the lower engaging member 2-3, and the upper engaging member 2-2 has a through hole for accommodating a portion of the shaft portion 3-2 of the mounting screw 3.

[0022] The beverage extraction device of the present utility model has a pressure holding function in the liquid outlet structure, whereby the powder puck in the extraction chamber is sufficiently extracted by warm water under pressure. Therefore, referring further to FIG. 3, a pressure holding assembly 4 is provided in the shaft hole 2-3-1 of the lower engaging member 2-3. The axis of the pressure holding assembly 4 coincides with the axis of the operating assembly 2. The pressure holding assembly 4 includes a pressure holding sheet 4-1, a pressure holding core 4-2, and a spring 4-3 that are coaxially arranged from bottom to top. The pressure holding sheet 4-1 is fixed to the lower engaging member 2-3 and exposed on the lower end surface of the lower engaging member 2-3. The pressure holding sheet 4-1 is a cup-shaped body having an upward opening. A liquid outlet hole 4-1-1 is provided at the bottom of the pressure holding sheet 4-1. The pressure holding core 4-2 is located in the internal cavity of the pressure holding sheet 4-1. The lower end of the spring 4-3 presses the pressure holding core 4-2, and the upper end indirectly presses the stepped surface of the shaft hole 2-3-1 of the lower engaging member 2-3. The pressure holding core 4-2 seals the upper opening of the liquid outlet hole 4-1-1.

[0023] A hollow adjustment element 4-4 is provided between the upper end of the spring 4-3 and the stepped surface of the shaft hole 2-3-1 of the lower engaging member 2-3. By replacing the hollow adjustment element 4-4 with another one having a different axial length, the pressure applied to the pressure holding core 4-2 by the spring 4-3 can be changed. Generally, the equipment supplier can use hollow adjustment elements 4-4 having different operating lengths on the extraction device according to various pressure requirements of the user.

[0024] To facilitate assembly and prevent leakage from the pressure holding assembly 4, the pressure holding sheet 4-1 is fitted tightly into the shaft hole 2-3-1 of the lower engaging member 2-3, so that the pressure to be held will not become excessively high and the pressure holding sheet 4-1 will not come off the lower engaging member 2-3.

[0025] Furthermore, the operating assembly 2 further includes a filter screen cover 2-5 having a filter screen. The filter screen cover 2-5 is screwed into the lower engaging member 2-3 and is located below the liquid outlet hole 4-1-1.

[0026] During extraction use of this utility model, after the beverage flows upward through the filter screen cover 2-5, if the thrust of the beverage in the extraction chamber against the pressure holding core 4-2 becomes greater than the pressure applied to the pressure holding core 4-2 by the spring 4-3, the pressure holding core 4-2 moves upward to open the liquid outlet hole 4-1-1. The beverage then flows upward through the spring 4-3, through the hollow portion of the hollow adjustment element 4-4, and through a portion of the shaft hole 2-3-1 to enter the liquid outlet passage for discharging the beverage. [Industrial applicability]

[0027] This utility model can be used for extracting coffee, tea, etc.

[0028] The above description is merely a preferred specific embodiment of the utility model, and the scope of protection of the utility model is not limited thereto. All equivalent substitutions or modifications made by a person skilled in the art within the technical scope disclosed by the utility model, based on the technical solution and the concept of the utility model, shall be included in the scope of protection of the utility model. [Explanation of symbols]

[0029] 1. Support member 1-1 Bottom wall 1-2 Deformed elongated holes 1-2-1 Large diameter hole 1-2-2 Small diameter hole 1-3 Protrusion 2 Actuator Assembly 2-1 Blind screw hole 2-2 Upper engaging member 2-3 Lower engaging member 2-3-1 Liquid outlet hole 2-4 Seal ring 2-5 Filter Screen Cover 3 Mounting screws 3-1 Head 3-2 Shaft 4. Pressure holding assembly 4-1 Pressure-retaining sheet 4-1-1 Liquid outlet hole 4-2 Pressure-holding core 4-3 Spring 4-4 Hollow adjustment element.

Claims

1. A beverage dispensing apparatus comprising a frame and an upper hammer fixed to the frame, wherein the upper hammer, an upwardly movable cylinder, and a lower hammer can form an extraction chamber, the upper hammer is provided with a liquid outlet structure for discharging beverages, and the upper hammer has a support member (1) fixed to the frame and an operating assembly (2) coaxially mounted below the support member (1), the operating assembly (2) being able to engage with the inner wall of the cylinder, The lower part of the support member (1) is a cup-shaped body having a bottom wall (1-1), and at least two blind screw holes (2-1) are evenly arranged circumferentially around the axis of the operating assembly (2), and the bottom wall (1-1) of the support member (1) is provided with at least two deformed elongated holes (1-2) corresponding to the blind screw holes (2-1), and each deformed elongated hole (1-2) has a large diameter hole (1-2-1) and a small diameter hole (1-2-2) that communicate radially with each other, and the operating assembly (2) is attached below the support member (1) in such a structure that the distance from the axis of the large diameter hole (1-2-1) to the axis of the support member (1), the distance from the axis of the small diameter hole (1-2-2) to the axis of the support member (1), and the distance from the axis of the blind screw hole (2-1) to the axis of the operating assembly (2) are all equal. A mounting screw (3) is provided, and the mounting screw (3) has a head (3-1) and a shaft (3-2), and with respect to the deformed elongated hole (1-2), the inner diameter of the large diameter hole (1-2-1) is larger than the outer diameter of the head (3-1) of the mounting screw (3), and the inner diameter of the small diameter hole (1-2-2) is larger than the outer diameter of the shaft (3-2) of the mounting screw (3) but smaller than the outer diameter of the head (3-1) of the mounting screw (3), The upper end surface of the small-diameter hole (1-2-2) of the deformed elongated hole (1-2) is lower than the upper end surface of the large-diameter hole (1-2-1), and above the upper end surface of the small-diameter hole (1-2-2) of the deformed elongated hole (1-2), a projection (1-3) is provided to restrict the movement of the head (3-1) of the mounting screw (3) toward the large-diameter hole (1-2-1). The mounting screw (3) is pre-screwed into the blind screw hole (2-1) of the operating assembly (2) to about half its depth, then the head (3-1) of the mounting screw (3) on the operating assembly (2) side is passed through the large diameter hole (1-2-1) of the deformed elongated hole (1-2), and the operating assembly (2) is rotated by an angle so that the shaft portion (3-2) of the mounting screw (3) is positioned inside the small diameter hole (1-2-2), and then the mounting screw (3) is tightened using a tool above the cup-shaped body of the support member (1), thereby fixing the operating assembly (2) to the support member (1). A beverage extraction apparatus characterized by the following features.

2. The operating assembly (2) comprises an upper engaging member (2-2), a lower engaging member (2-3), and a seal ring (2-4) that makes sealing contact with the inner wall of the cylinder. The upper engaging member (2-2) has an annular lower end surface that presses the seal ring (2-4) downward, and the lower engaging member (2-3) has an annular upper end surface that presses the seal ring (2-4) upward. The beverage extraction apparatus according to claim 1, characterized in that

3. The beverage dispensing apparatus according to claim 2, characterized in that the blind screw hole (2-1) is provided in the lower engaging member (2-3), and the upper engaging member (2-2) has a through hole for accommodating a part of the shaft portion (3-2) of the mounting screw (3).

4. A pressure-holding assembly (4) is provided in the axial hole (2-3-1) of the lower engaging member (2-3), the axis of the pressure-holding assembly (4) coincides with the axis of the operating assembly (2), the pressure-holding assembly (4) comprises a pressure-holding seat (4-1), a pressure-holding core (4-2), and a spring (4-3) arranged coaxially from bottom to top, the pressure-holding seat (4-1) is fixed to the lower engaging member (2-3) and exposed to the lower end surface of the lower engaging member (2-3), and the pressure-holding seat (4-1) is facing upward The beverage extraction device according to claim 2, characterized in that it is a cup-shaped body having an opening, a liquid outlet hole (4-1-1) is provided at the bottom of the pressure-holding sheet (4-1), the pressure-holding core (4-2) is located in the internal cavity of the pressure-holding sheet (4-1), the lower end of the spring (4-3) presses against the pressure-holding core (4-2), the upper end directly or indirectly presses against the stepped surface of the shaft hole (2-3-1) of the lower engaging member (2-3), and the pressure-holding core (4-2) seals the upper opening of the liquid outlet hole (4-1-1).

5. The beverage extraction apparatus according to claim 4, characterized in that the upper end of the spring (4-3) indirectly presses against the stepped surface of the axial hole (2-3-1) of the lower engaging member (2-3), a hollow adjustment element (4-4) is provided between the upper end of the spring (4-3) and the stepped surface of the axial hole (2-3-1) of the lower engaging member (2-3), and the pressure applied to the pressure holding core (4-2) by the spring (4-3) can be changed by replacing the hollow adjustment element (4-4) with another one having a different axial length.

6. The beverage dispensing apparatus according to claim 4, characterized in that the pressure-holding sheet (4-1) fits snugly into the axial hole (2-3-1) of the lower engaging member (2-3).

7. The beverage extraction apparatus according to claim 4, wherein the operating assembly (2) further comprises a filter screen cover (2-5) having a filter screen, the filter screen cover (2-5) being screwed onto the lower engaging member (2-3) and positioned below the liquid outlet hole (4-1-1).

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