Coffee extraction box with anti-reflux diaphragm

Abstract

The coffee extraction box comprises a brewing box cover and the anti-backflow diaphragm piece, a water flow injection hole column is arranged in the axial center of the brewing box cover, a water flow columnar through hole is formed in the water flow injection hole column, an upper sealing end face is arranged on a main body of the anti-backflow diaphragm piece, and the upper sealing end face is in contact sealing with the inner top end of the brewing box cover. An upper sealing diaphragm lip and a sealing lip outer opening are arranged at the top end of the anti-reflux diaphragm main body, the sealing lip outer opening is arranged on the peripheral side of the upper sealing diaphragm lip, and the upper sealing diaphragm lip is in sealing contact with the inner bottom end hole of the water flow columnar through hole, so that water flow is prevented from reversely flowing upwards; the outer circumferential diameter of the upper sealing diaphragm lip piece is larger than the hole diameter of the inner bottom end hole of the water flow columnar through hole, the bottom end of the upper sealing diaphragm lip piece is provided with a section of suspended height space, and the sealing lip outer opening is communicated with the suspended height space below the upper sealing diaphragm lip piece. And the phenomenon that high-temperature liquid flows back out of an original injection port after being injected to cause blockage and other countercurrent hidden dangers is avoided.

Description

Technical Field

[0001] The utility model relates to coffee extraction, in particular to a coffee extraction box with an anti-backflow diaphragm sheet used in a coffee machine to extract coffee liquid. Background Art

[0002] In the process of preparing coffee, the extraction of coffee liquid is usually an important factor that determines the taste of the prepared coffee. In the existing coffee preparation and extraction process, there is a possibility of backflow of high-temperature liquid from the original injection port after injection, causing hidden dangers such as blockage, thereby causing problems such as blockage and hygiene in the extraction and preparation of coffee liquid.

[0003] Patent No. ZL201820366458.2, published on May 3, 2019, discloses a coffee extraction device, including an extraction cylinder, an extraction chamber vertically penetrating the extraction cylinder, a heating component capable of heating the extraction chamber, compression pieces at the upper and lower ends of the extraction cylinder, the compression piece having a vertical movement stroke, the extraction chamber being located on the movement path of the compression piece, a water pipe connected to the extraction chamber being provided on the compression piece, a driving piece being provided on the compression piece, and the driving piece being connected to the compression piece in a transmission manner. The extraction chamber is provided in the extraction cylinder for accommodating coffee powder and the extraction chamber is heated by the heating component, and pure water is introduced into the extraction chamber through the water pipe in any one of the compression pieces, and then two compression pieces are used to move into the extraction chamber to squeeze the coffee powder in the extraction chamber to perform extraction, and then the extracted coffee liquid is discharged through the water pipe in one of the compression pieces, and the waste water is discharged through the water pipe in the other compression piece. The utility model is applied to coffee extraction equipment. Although this solution improves the extraction effect of the coffee liquid to a certain extent by squeezing, extracting and filtering the coffee liquid through the upper and lower compression parts, there is a risk of backflow in the water inlet pipe after the water flows into the water inlet pipe during the squeezing process. Utility Model Content

[0004] The utility model aims to solve the problem that the existing coffee preparation and extraction has the possibility of backflow hidden danger phenomenon that high-temperature liquid may flow back out of the original injection port after injection and cause the hidden danger of blockage, thereby causing the hidden danger of blockage, sanitation and the like in the coffee liquid extraction preparation. The utility model provides a coffee extraction box with an anti-backflow diaphragm which can effectively avoid the backflow hidden danger phenomenon that high-temperature liquid may flow back out of the original injection port after injection and cause the hidden danger of blockage.

[0005] The utility model adopts the specific technical scheme to solve the above technical problems: a coffee extraction box with an anti-backflow diaphragm, comprising a brewing box cover, a brewing box and a powder bowl, characterized in that it also includes an anti-backflow diaphragm, the axial center of the brewing box cover is provided with a water flow injection hole column extending vertically upward and protruding out of the top end of the brewing box cover, a water flow columnar through hole is provided in the water flow injection hole column, the anti-backflow diaphragm body has an upper sealing end face, the upper sealing end face is in contact and sealed with the top end of the brewing box cover, an upper sealing diaphragm lip and a sealing lip outer opening are provided at the top of the anti-backflow diaphragm body, the outer peripheral side of the upper sealing diaphragm lip is provided with a sealing lip outer opening, the upper sealing diaphragm lip is in sealing contact with the bottom end hole in the water flow columnar through hole to prevent water from flowing upward, the outer circumferential diameter of the upper sealing diaphragm lip is larger than the diameter of the bottom end hole in the water flow columnar through hole, the bottom end of the upper sealing diaphragm lip has a suspended height space, and the sealing lip outer opening is connected with the suspended height space below the upper sealing diaphragm lip. The upper sealing diaphragm lip, the outer opening of the sealing lip and the suspended height space below the upper sealing diaphragm lip are provided with an effective downward opening of the upper sealing diaphragm lip, and the water injection hole column is provided for the normal flow direction of the high-temperature liquid to flow in, and when backflow out of the original injection port may occur after injection, it is sealed upward in time, quickly and effectively to prevent the hidden danger of backflow, thereby effectively avoiding the adverse hidden dangers of blockage and hygiene caused by the extraction and preparation of coffee liquid, and improving the effectiveness of the docking injection and injection of high-temperature liquid and the reliable effectiveness of preventing backflow through the water injection hole column.

[0006] Preferably, the anti-backflow diaphragm body includes an upper sealing end face, an upper sealing diaphragm lip, an outer opening of the sealing lip, a side sealing ring and a vertical sealing ring column, the vertical sealing ring column is arranged on the inner side of the side sealing ring and the outer side of the upper sealing end face, the outer opening of the sealing lip is arranged on the outer peripheral side of the upper sealing diaphragm lip, the upper sealing diaphragm lip is connected to the upper sealing end face, the upper end face of the upper sealing diaphragm lip is flush with the upper sealing end face, and the lower end face of the upper sealing diaphragm lip has a suspended height space, so as to improve the smoothness of the injection input of the upper sealing diaphragm lip against high-temperature liquid and the reliability and effectiveness of the protection against backflow.

[0007] Preferably, the upper sealing end face has a downwardly recessed annular sealing groove between its outer ring side wall and the inner side wall of the vertical sealing ring column, thereby improving the reliability and effectiveness of the sealing guided jet extraction of high-temperature liquid from the downwardly opened sealing diaphragm lip to the water-dividing mesh.

[0008] Preferably, the bottom of the anti-backflow diaphragm body is provided with a concave-convex positioning and limiting structure, a bottom sealing pad pressure plate is provided below the concave-convex positioning and limiting structure, a pressure plate mounting hole is provided on the bottom sealing pad pressure plate, and the sealing pad pressure plate presses and connects the anti-backflow diaphragm body to the top of the brewing box cover through the pressure plate mounting hole, thereby improving the reliability and effectiveness of the anti-backflow use of the integral installation and fixed connection between the anti-backflow diaphragm and the top of the brewing box cover.

[0009] Preferably, the top of the sealing pad pressure plate is provided with an annular guide groove through hole, which is provided in the space area below the lower end surface of the upper sealing diaphragm lip, and is used to disperse and guide the water flow downward out of the bottom of the sealing pad pressure plate, and the outer groove body height of the annular guide groove through hole is greater than the inner groove body height, and the outer groove body height of the annular guide groove through hole extends vertically upward and protrudes higher than the top of the main body of the sealing pad pressure plate. The effectiveness of the top of the sealing pad pressure plate for downward introduction of high-temperature liquid after opening downward from the upper sealing diaphragm lip and injecting it is improved, as well as the effectiveness of the downward dispersion and smooth export of the high-temperature liquid annular diversion, and the effectiveness of mixed extraction of high-temperature liquid is improved.

[0010] Preferably, the circumference of the inner wall of the outer groove body of the annular guide groove through hole is larger than the circumference of the outer opening of the sealing lip, the circumference of the upper end surface of the inner groove body of the annular guide groove through hole is larger than the circumference of the water column through hole, and the water column through hole is located at the center position above the upper end surface of the inner groove body of the annular guide groove through hole, so as to improve the effectiveness of the top of the sealing pad pressure plate in the downward smooth introduction of the high-temperature liquid after the upper sealing diaphragm lip is opened downward.

[0011] Preferably, a funnel is provided at the bottom end of the brewing box, and a bottom vertical columnar body is provided at the center of the funnel, and a plurality of vertical support blades distributed radially are connected to the outer peripheral surface of the bottom vertical columnar body, and the inner side of each support blade is vertically connected to the outer peripheral surface of the bottom vertical columnar body, and the outer side surface of each support blade has a support blade outer side surface that cooperates with the inner bottom wall of the bottom end of the brewing box coffee liquid outlet to support the effectiveness of the cooperation between the funnel and the inner bottom wall of the bottom end of the brewing box coffee liquid outlet, and improves the effectiveness of the space formed by the multiple vertical support blades distributed radially in the funnel and the collision, dispersion, extraction and mixing of the blades.

[0012] Preferably, the funnel is provided with a funnel coffee liquid injection slot on the upper end face of the funnel body, the diameter of the funnel coffee liquid injection slot is larger than the size of the coffee liquid spraying range of the fine holes at the bottom of the powder bowl arranged at the bottom of the powder bowl, the bottom end face of the funnel coffee liquid injection slot is provided with a coffee liquid injection slot bottom end reflux end face, the coffee liquid injection slot bottom end reflux end face is provided with a funnel outflow leakage port, the size of the coffee liquid injection slot bottom end reflux end face is smaller than the outer circumference size of the funnel coffee liquid injection slot, forming a coffee liquid injection slot structure with a small bottom and a large top inverted trapezoidal shape, so that the coffee liquid is injected into the reflux end face at the bottom end of the coffee liquid injection port, and then continues to reversely spray upward to flow toward the upper end face of the funnel, and diffuses outward from the outer periphery of the upper end face of the funnel downward to the bottom end of the funnel and leaks out of the brewing box together with the funnel outflow leakage port. The coffee liquid is injected into the reflux end face at the bottom of the groove by forcefully colliding downward, and then collides and diffuses from the periphery to the outside, and flows downward to the bottom of the funnel and leaks out from the funnel outlet to form a space with the vertical supporting blades, and the collision and mixing extraction of the blades is improved, thereby improving the delicate effectiveness of the further jetting, impact extraction and collision of the coffee liquid, improving the uniformity of the collision and mixing of the coffee liquid and the air, improving the taste of the coffee after extraction, and improving the reasonable effectiveness of the funnel impact extraction and collision structure.

[0013] Preferably, the funnel is provided with a coil spring group composed of a plurality of coil springs at the upper end of the funnel body, each coil spring is formed by a reed sheet being rolled into a coil spring, and the plurality of coil springs are mutually staggered and superimposed in multiple layers to form many tiny coil spring pores under the strong impact of coffee liquid, a funnel cover is provided above the coil spring, and the funnel cover is provided with a funnel coffee liquid injection slot, the diameter size of the funnel coffee liquid injection slot is larger than the coffee liquid spraying range size of the fine holes at the bottom of the powder bowl set at the bottom of the powder bowl, the bottom end face of the funnel coffee liquid injection slot is provided at the upper end face of the coil spring group after the multiple layers are superimposed, the bottom end of the funnel coffee liquid injection slot is provided with a slot bottom end flow outlet, the slot bottom end flow outlet is provided at the upper end face of the coil spring group, and the bottom end face of the coil spring group is provided with a funnel outflow channel opening, the coffee liquid after being ejected and extracted from the fine holes at the bottom of the powder bowl forms a large amount of oil foam under the action of the fine holes of the coil spring group, and then mixes with the coffee liquid at the outlet at the bottom of the slot, and then enters the funnel outflow channel opening, and finally leaks out of the brewing box from the bottom end of the funnel. The coffee liquid strongly impacts the spring pores of the mutually staggered and superimposed multi-layer spring group, flows to the bottom of the funnel and leaks out from the funnel outlet to form a space between the vertical supporting blades and the collision of the blades for mixed extraction, thereby improving the delicate effectiveness of the further jet impact extraction collision of the coffee liquid, improving the effectiveness of the uniform collision and mixing of the coffee liquid and the air, improving the taste of the extracted coffee, and improving the reasonable effectiveness of the impact extraction collision structure.

[0014] Preferably, the coil spring group adopts 3 to 6 coil springs that are mutually staggered and superimposed to form a multi-layer coil spring group structure, and each coil spring is formed by rolling a spring sheet, so as to improve the coffee liquid's strong impact on the coil spring pores of the mutually staggered and superimposed multi-layer coil spring group, and the coffee liquid's impact mixing extraction is delicate and flexible.

[0015] The beneficial effects of the utility model are as follows: the upper sealing diaphragm lip, the outer opening of the sealing lip, and the suspended height space below the upper sealing diaphragm lip provide the upper sealing diaphragm lip with an effective downward opening of the water flow injection hole column for the normal flow direction of the high-temperature liquid to flow into the injection hole column, and when there may be a backflow out of the original injection port after injection, it is promptly and quickly and effectively sealed upward to prevent the hidden danger of backflow, thereby effectively avoiding the bad hidden dangers such as blockage and sanitation caused by coffee liquid extraction and preparation, and improving the effectiveness of the docking injection and injection of high-temperature liquid and the reliable effectiveness of preventing backflow through the water flow injection hole column. Improve the reliability and effectiveness of the sealed injection of high-temperature liquid from the downward opening of the sealing diaphragm lip to the water diversion mesh for sealed guided injection extraction, prevent the coffee powder flow from backflowing back to the brewing box cover and cause blockage by the high-temperature liquid water flowing into the hole column, and prevent the backflow phenomenon of the high-temperature liquid from backflowing out of the brewing box cover injection hole column after injection, thereby improving the hygienic and safe effectiveness of coffee extraction and preparation. The funnel can improve the fineness and effectiveness of the further jet impact extraction and collision of the coffee liquid, improve the uniformity and effectiveness of the collision and mixing of the coffee liquid and the air, improve the taste of the coffee after the jet impact extraction and collision extraction, improve the reasonableness and effectiveness of the impact extraction and collision structure, improve the fineness of the coffee liquid foam and oil, and improve the taste of the coffee. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0017] Figure 1 The utility model is a schematic diagram of the structure of the anti-backflow diaphragm sheet used in the coffee extraction box with the anti-backflow diaphragm sheet.

[0018] Figure 2 The utility model is a three-dimensional structural schematic diagram of the anti-backflow diaphragm sheet used in the coffee extraction box with the anti-backflow diaphragm sheet and a structural schematic diagram when the sealing pad pressure plate is used.

[0019] Figure 3 The utility model is a schematic structural diagram of a coffee extraction box structure with an anti-backflow diaphragm.

[0020] Figure 4 yes Figure 3 Schematic diagram of the explosion structure.

[0021] Figure 5 It is another structural schematic diagram of the coffee extraction box with the anti-backflow diaphragm of the utility model.

[0022] Figure 6 yes Figure 5 Schematic diagram of the explosion structure. DETAILED DESCRIPTION

[0023] Embodiment 1:

[0024] Figure 1 , Figure 2 , Figure 3 , Figure 4 In the embodiment shown, a coffee extraction box with an anti-backflow diaphragm comprises a brewing box cover 30, a brewing box 90 and a powder bowl 50, an anti-backflow diaphragm body 01, and the anti-backflow diaphragm body 01 has an upper sealing end surface 10, and the upper sealing end surface 10 is used to be connected with the brewing box cover 30 (see Figure 3 , Figure 5 ) The inner top end is in contact with the seal, the top of the anti-backflow diaphragm body 01 where the upper sealing end surface 10 is located is provided with an upper sealing diaphragm lip 11 and a sealing lip outer opening 12, and the axial center of the brewing box cover is provided with a water flow injection hole column 31 extending vertically upward and protruding out of the top of the brewing box cover (see Figure 3 , Figure 4 , Figure 5 , Figure 6 ), the upper sealing diaphragm lip 11 is used to communicate with the water columnar through hole (see Figure 3 , Figure 5) The inner bottom end faces correspond to each other in sealing contact to prevent water from flowing upward. The outer side of the upper sealing diaphragm lip 11 has a sealing lip outer opening 12. The outer circumferential diameter of the upper sealing diaphragm lip 11 is larger than the aperture size of the water columnar through hole 32 set in the water injection hole column 31. The water columnar through hole 32 is a columnar hole structure. The bottom end of the upper sealing diaphragm lip 11 has a suspended height space H. The main body 01 of the anti-backflow diaphragm sheet includes an upper sealing end face 10, an upper sealing diaphragm lip 11, a sealing lip outer opening 12, a side sealing ring 16 and a vertical sealing ring column 14. The vertical sealing ring column 14 is arranged at the inner side 16 of the side sealing ring and the outer side of the upper sealing end face 11. The sealing lip outer opening 12 is opened at the outer peripheral side of the upper sealing diaphragm lip 11. The upper sealing diaphragm lip 11 is extended and connected with the upper sealing end face 10. The upper end face of the upper sealing diaphragm lip 11 is flush with the upper sealing end face 10, and the lower end face of the upper sealing diaphragm lip 11 has a suspended height space H. The main body 01 of the anti-backflow diaphragm sheet is made of a high-temperature resistant elastic material structure, such as a food-grade silicone material structure. The upper sealing end face 10 has a downwardly recessed annular sealing groove 15 between its outer ring side wall 19 and the inner side wall of the vertical sealing ring column 14. The anti-backflow diaphragm body 01 is provided with a plurality of installation positioning holes 13, which may be three installation positioning holes 13 distributedly provided, so as to improve the stability, reliability and effectiveness of the installation and use of the anti-backflow diaphragm. The bottom 17 of the anti-backflow diaphragm body is provided with a bottom concave-convex positioning and limiting structure 18 for installing and connecting the sealing pad pressing plate 20. The sealing pad pressing plate 20 is installed and connected with the anti-backflow diaphragm body 01 at the top of the brewing box cover 30 through the bottom concave-convex positioning and limiting structure 18. The sealing lip outer opening 12 is connected with the highly suspended space H below the upper sealing diaphragm lip 11. The top of the sealing pad pressure plate 20 is provided with an annular guide groove through hole 23, which is arranged in the space area below the lower end surface of the upper sealing diaphragm lip 11. The annular guide groove through hole 23 is used to disperse the water flow downward and guide it to flow out of the bottom of the sealing pad pressure plate. The circumference size of the inner wall of the outer groove body of the annular guide groove through hole 23 is larger than the outer circumference size of the outer opening of the sealing lip, and the circumference size of the upper end surface of the inner groove body of the annular guide groove through hole 23 is larger than the circumference size of the water columnar through hole 32. The water columnar through hole 32 is located at the center position above the upper end surface of the inner groove body of the annular guide groove through hole 23. The annular guide groove through hole is opened in the space area below the lower end surface of the upper sealing diaphragm lip. The annular guide groove through hole is used to disperse the water flow downward and guide it out of the bottom of the sealing gasket pressure plate. The outer groove body height of the annular guide groove through hole 23 is greater than the inner groove body height. The outer groove body height of the annular guide groove through hole extends vertically upward and protrudes higher than the top height of the sealing gasket pressure plate body.The sealing pad pressure plate 20 is provided with a pressure plate mounting hole 24 for mounting, connecting and fixing with the anti-backflow diaphragm body 01. The pressure plate mounting hole 24 of the sealing pad pressure plate 20 is positioned and press-fitted with the mounting positioning hole 13 provided on the anti-backflow diaphragm body 01 by fastening screws 25 and arranged at the top inner part of the brewing box cover, thereby achieving the installation, connection and fixing of the anti-backflow diaphragm body 01 at the top inner part of the brewing box cover through the sealing pad pressure plate 20. The anti-backflow diaphragm body 01 and the sealing diaphragm lip 11 thereon are made of an elastic sealing material structure as a whole, such as an elastic food-grade silicone material structure. A funnel is installed at the bottom inner end of the brewing box 90, and the center of the funnel 60 has a bottom vertical columnar body 61 (see below) pointing vertically downward. Figure 4 ), the outer circumference of the bottom vertical column 61 is connected with a plurality of radially distributed vertical support blades 62, the inner side of each vertical support blade 62 is vertically connected to the outer circumference of the bottom vertical column 61, and the outer side of each vertical support blade 62 has a support leaf outer side surface 63 that cooperates with the inner bottom wall of the bottom end of the coffee liquid outlet of the box; the top end of each support blade 62 is connected to the funnel outflow channel 64 (see Figure 3 , Figure 5 ) outside, funnel outflow leakage openings 64 are distributed between the tops of two adjacent supporting blades 62; or the top of each supporting blade 62 is connected to the outside of the funnel outflow leakage opening 64. The anti-backflow diaphragm, the sealing pad pressure plate 20, the water separation mesh 40, the powder bowl 50 and the funnel are arranged in order from top to bottom in the brewing box cover 30 and the brewing box 90; the high-temperature liquid is formed by the high-pressure injection of the water pump from the brewing box cover from the top (the high-temperature liquid water injection hole column 32 in the water flow injection hole column 31 of the brewing box cover) to the bottom through the anti-backflow diaphragm, the sealing pad pressure plate 20, the water separation mesh 40, the powder bowl 50 and the funnel (see Figure 3 , Figure 5The extraction flow direction is shown by the arrows ABC shown in the figure), after the high-temperature liquid is mixed with the coffee powder 55 into coffee liquid through the water-dividing mesh 40, a high-pressure liquid is formed in the powder bowl 50 and is ejected from the fine holes at the bottom of the powder bowl to the coffee liquid ejection extraction flow direction of the funnel; the top surface of the anti-backflow diaphragm is in contact and sealed with the bottom end surface of the high-temperature liquid water inlet of the brewing box cover 30, a powder bowl bottom fine hole 52 is provided at the bottom of the powder bowl 50, a bottom powder plate 53 and a powder bowl bottom are arranged in the powder bowl 50, a powder bowl bottom fine hole 52 is provided at the bottom position of the powder bowl bottom, a plurality of powder plate fine holes 51 are distributed on the bottom powder plate 53, and the powder bowl bottom fine hole 52 is located below the plurality of powder plate fine holes 51, and the coffee liquid first passes through the plurality of powder plate fine holes 51 and then converges downward to the powder bowl bottom fine hole 52 and is ejected downward outward to the funnel for funnel extraction. A plurality of locking and positioning blocks 33 are connected to the outer ring side wall at the top of the brewing box cover 30, and the locking and positioning blocks 33 are used to fix the coffee extraction box structure together with its brewing box cover 30 on the coffee machine base. The water-dividing mesh has a downwardly curved mesh structure, and a plurality of water-dividing mesh holes are distributed on the curved mesh structure. The water-dividing and mixing of the high-temperature liquid and the coffee powder is improved quickly and efficiently. The countercurrent diaphragm is used to prevent the coffee powder flow from flowing back to the high-temperature liquid water flow inlet of the brewing box cover and causing blockage. The water-dividing mesh has a downwardly curved mesh structure, and a plurality of water-dividing mesh holes are distributed on the curved mesh structure. The funnel is provided with a funnel coffee liquid injection slot 67 on the upper end surface of the funnel body, the diameter of the funnel coffee liquid injection slot is larger than the coffee liquid spraying range size of the fine hole at the bottom of the powder bowl, the bottom end surface of the funnel coffee liquid injection slot is provided with a coffee liquid injection slot bottom end reflux end surface 66, the coffee liquid injection slot bottom end reflux end surface 66 is provided with a funnel outflow leakage channel 64 and a residual coffee discharge hole 69, the size of the coffee liquid injection slot bottom end reflux end surface 66 is smaller than the outer circumference size of the funnel coffee liquid injection slot 67, forming a coffee liquid injection collision groove structure with a small bottom and a large top inverted trapezoidal shape, so that the coffee liquid is injected and injected into the coffee liquid injection port bottom end reflux end surface, and then continues to reversely spray upward and flow to the upper end surface of the funnel, and diffuses outward from the outer periphery of the upper end surface of the funnel downward to the bottom end of the funnel, and leaks out from the funnel outflow leakage channel to mix, and forms a space with the vertical supporting blades and air collision extraction flow direction, and then is extracted and leaked out of the brewing box (see Figure 3The extraction direction is shown by the arrow mark BC shown in the figure). A powder bowl bottom pore 52 is provided at the bottom of the powder bowl 40, and the aperture size of the multiple powder plate pores 51 and the powder bowl bottom pores 52 is 0.3mm to 0.6mm. Improve the fineness of the extraction of the coffee liquid sprayed from the bottom of the powder bowl to the funnel and the effectiveness of mixing with the air. The multiple powder plate pores 51 are arranged separately and distributed on the bottom powder plate 53 above the bottom powder bowl bottom pore 52. The bottom powder bowl bottom pore is opened at the bottom center of the arc bowl bottom. The multiple powder plate pores 51 and the powder bowl bottom pores 52 are separated by a space distance, forming an upper and lower double-layer convergence of the powder bowl bottom pore spray extraction flow. Furthermore, the aperture size of the powder bowl bottom pore 52 is 0.45±0.5mm.

[0025] Embodiment 2:

[0026] Figure 1 , Figure 2 , Figure 5 , Figure 6 In the embodiment shown, a coil spring group consisting of a plurality of coil springs 70 stacked in multiple layers is installed in the funnel body. Each coil spring 70 is formed by rolling a spring sheet into a coil spring. The plurality of coil springs 70 are mutually staggered and stacked in multiple layers to form many tiny coil spring pores under the strong impact of the coffee liquid. Further, a coil spring group consisting of four coil springs 70 is arranged in the funnel. The four coil springs 70 are mutually staggered and stacked in four layers to form many tiny coil spring pores. Of course, the coil spring group can also be a multi-layer coil spring group structure formed by 3 to 6 coil springs mutually staggered and stacked. A funnel cover 80 is installed above the coil spring 70. The funnel cover 80 is provided with a funnel coffee liquid injection slot 81 and a funnel cover mounting fixing hole 82. The plurality of coil springs 70 are stacked and fixedly limited to the funnel cover 80 through the funnel cover mounting fixing hole 82. and the funnel; the diameter of the funnel coffee liquid injection slot 81 is larger than the coffee liquid ejection range size of the fine holes 52 at the bottom of the powder bowl; the bottom end surface of the funnel coffee liquid injection slot 81 is arranged at the upper end surface of the coil spring group after the multi-layer coil springs 70 are stacked; the bottom end of the funnel coffee liquid injection slot 81 is provided with a slot bottom end flow outlet 83; the slot bottom end flow outlet 83 is arranged at the upper end surface of the coil spring group; the bottom end surface of the coil spring group is provided with a funnel outflow leakage channel 64; the coffee liquid ejected from the fine holes at the bottom of the powder bowl strongly collides with the coil spring fine holes of the multi-layer coil spring group that are misaligned and stacked to form a large amount of oil foam mixed with the coffee liquid flowing to the slot bottom end flow outlet, and then enters the funnel outflow leakage channel to form a space with the vertical supporting blades and the air collision extraction flow direction to jointly extract and leak out of the brewing box (see Figure 5The arrow mark BC shows the extraction flow direction). The coffee liquid is sprayed from the fine holes at the bottom of the powder bowl to the coil spring in the middle of the funnel under high pressure. The coil spring is formed by stacking multiple layers to form many tiny coil spring pores. After the coffee liquid is sprayed through the fine holes at the bottom of the powder bowl and strongly hits the coil spring pores of the coil spring group, the coffee liquid forms a large amount of oil foam mixed with the coffee liquid and the air is mixed more fully and evenly, making the foam oil more delicate and more foamy, thereby improving the taste of the coffee. Others are the same as in Example 1. The coffee liquid is sprayed from the fine holes at the bottom of the powder bowl to form a high-pressure water column and sprayed into the cavity in the middle of the funnel under high pressure. The coffee liquid accumulates in the cavity, and the funnel is reversely sprayed to diffuse outward from the outer periphery of the upper end surface of the funnel and downward to hit the coffee liquid flowing to the bottom port of the funnel, and the vertical support blades form a space and air collision extraction leakage, so that the high-pressure water column collides with the coffee effluent during the spraying process and wraps a lot of air into the coffee liquid, so that the coffee liquid and the air are mixed more fully and evenly, more foam is generated, and the foam oil is more delicate, thereby improving the taste of the coffee.

[0027] In the description of positional relationships in the present invention, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate orientation or positional relationships are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] The above content and structure describe the basic principle, main features and advantages of the utility model product, which should be understood by technicians in this industry. The above examples and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which are within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A coffee extraction box with an anti-backflow diaphragm, comprising a brewing box cover, a brewing box and a powder bowl, characterized in that: It also includes an anti-backflow diaphragm, a water injection hole column extending vertically upward and protruding out of the top of the brewing box cover is provided at the axial center of the brewing box cover, a water columnar through hole is provided in the water injection hole column, the anti-backflow diaphragm body has an upper sealing end face, the upper sealing end face is in contact and sealed with the top of the inner top of the brewing box cover, an upper sealing diaphragm lip and an outer opening of the sealing lip are provided at the top of the anti-backflow diaphragm body, the outer side of the upper sealing diaphragm lip has an outer opening of the sealing lip, the upper sealing diaphragm lip is in sealing contact with the bottom end hole in the water columnar through hole to prevent water from flowing upward, the outer circumferential diameter of the upper sealing diaphragm lip is larger than the aperture size of the bottom end hole in the water columnar through hole, the bottom end of the upper sealing diaphragm lip has a suspended height space, and the outer opening of the sealing lip is connected with the suspended height space below the upper sealing diaphragm lip.

2. The coffee extraction box with the anti-backflow diaphragm according to claim 1, characterized in that: The anti-backflow diaphragm body includes an upper sealing end face, an upper sealing diaphragm lip, an outer opening of the sealing lip, a side sealing ring and a vertical sealing ring column. The vertical sealing ring column is arranged on the inner side of the side sealing ring and the outer side of the upper sealing end face. The outer opening of the sealing lip is arranged on the outer peripheral side of the upper sealing diaphragm lip. The upper sealing diaphragm lip is connected to the upper sealing end face. The upper end face of the upper sealing diaphragm lip is flush with the upper sealing end face, and the lower end face of the upper sealing diaphragm lip has a suspended height space.

3. The coffee extraction box with anti-backflow diaphragm according to claim 2, characterized in that: The upper sealing end surface is provided with a downwardly recessed annular sealing groove between its outer ring side wall surface and the inner side wall of the vertical sealing ring column.

4. The coffee extraction box with a backflow prevention diaphragm according to claim 1, characterized in that: A concave-convex positioning and limiting structure is provided at the bottom of the anti-backflow diaphragm body, a bottom sealing pad pressure plate is provided below the concave-convex positioning and limiting structure, and a pressure plate mounting hole is provided on the bottom sealing pad pressure plate. The sealing pad pressure plate presses and connects the anti-backflow diaphragm body to the top of the brewing box cover through the pressure plate mounting hole.

5. The coffee extraction box with the anti-backflow diaphragm according to claim 4, characterized in that: An annular guide groove through hole is provided at the top of the sealing gasket pressure plate, and the annular guide groove through hole is provided in the space area below the lower end surface of the upper sealing diaphragm lip. The annular guide groove through hole is used to disperse and guide the water flow downward to flow out of the bottom of the sealing gasket pressure plate. The outer groove body height of the annular guide groove through hole is greater than the inner groove body height, and the outer groove body height of the annular guide groove through hole extends vertically upward and protrudes higher than the top height of the sealing gasket pressure plate body.

6. The coffee extraction box with a backflow prevention diaphragm according to claim 5, characterized in that: The circumferential dimension of the inner wall of the outer groove body of the annular guide groove through hole is larger than the circumferential dimension of the outer opening of the sealing lip, the circumferential dimension of the upper end surface of the inner groove body of the annular guide groove through hole is larger than the circumferential dimension of the water columnar through hole, and the water columnar through hole is located at the center position above the upper end surface of the inner groove body of the annular guide groove through hole.

7. The coffee extraction box with a backflow prevention diaphragm according to claim 1, characterized in that: The brewing box is provided with a funnel at the inner bottom end, and a bottom vertical columnar body is provided in the center of the funnel, and a plurality of vertical supporting blades distributed radially are connected to the outer peripheral surface of the bottom vertical columnar body, and the inner side of each vertical supporting blade is vertically connected to the outer peripheral surface of the bottom vertical columnar body, and the outer side surface of each vertical supporting blade has an outer side surface of a supporting leaf that cooperates with the inner bottom wall of the inner bottom end of the coffee liquid outlet of the brewing box for support.

8. The coffee extraction box with the anti-backflow diaphragm according to claim 7, characterized in that: The funnel is provided with a funnel coffee liquid injection slot on the upper end face of the funnel body, the diameter of the funnel coffee liquid injection slot is larger than the size of the coffee liquid spraying range of the fine holes at the bottom of the powder bowl arranged at the bottom of the powder bowl, the bottom end face of the funnel coffee liquid injection slot is provided with a coffee liquid injection slot bottom end reflux end face, the coffee liquid injection slot bottom end reflux end face is provided with a funnel outflow leakage port, the size of the coffee liquid injection slot bottom end reflux end face is smaller than the outer circumference size of the funnel coffee liquid injection slot, forming a coffee liquid injection slot structure with a small bottom and a large top inverted trapezoidal shape, so that the coffee liquid is injected into the reflux end face at the bottom end of the coffee liquid injection port, and then continues to reversely spray upward to flow toward the upper end face of the funnel, and diffuses outward from the outer periphery of the upper end face of the funnel downward to the bottom end of the funnel and leaks out of the brewing box together with the funnel outflow leakage port.

9. The coffee extraction box with a backflow prevention diaphragm according to claim 7, characterized in that: The funnel is provided with a coil spring group composed of a plurality of coil springs at the upper end of the funnel body, each coil spring is formed by a reed sheet being rolled into a coil spring, and the plurality of coil springs are mutually staggered and stacked in multiple layers to form many tiny coil spring pores under the strong impact of coffee liquid, a funnel cover is provided above the coil spring, and the funnel cover is provided with a funnel coffee liquid injection slot, the diameter size of the funnel coffee liquid injection slot is larger than the coffee liquid spraying range size of the powder bowl bottom pores arranged at the bottom of the powder bowl, the bottom end face of the funnel coffee liquid injection slot is arranged at the upper end face of the coil spring group after the multiple layers are stacked, the bottom end of the funnel coffee liquid injection slot is provided with a slot bottom end flow outlet, the slot bottom end flow outlet is arranged at the upper end face of the coil spring group, and the bottom end face of the coil spring group is provided with a funnel outflow leakage opening; thereby, the coffee liquid extracted by spraying from the pores at the bottom of the powder bowl strongly collides with the coil spring pores of the mutually staggered and stacked multiple layers of coil springs, forming a large amount of oil foam mixed coffee liquid that flows to the slot bottom end flow outlet, then enters the funnel outflow leakage opening, and finally leaks out of the brewing box from the bottom end of the funnel.

10. The coffee extraction box with a backflow prevention diaphragm according to claim 9, characterized in that: The coil spring group adopts 3 to 6 coil springs which are staggered and stacked to form a multi-layer coil spring group structure, and each coil spring is formed by rolling a spring sheet into a coil spring.

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