Coffee extraction device and extraction method

Abstract

The invention belongs to the technical field of coffee extraction, and particularly relates to a coffee extraction device and an extraction method.The coffee extraction device comprises a base cylinder and a water injection cylinder located on the base cylinder, and a water injection assembly is installed in the water injection cylinder; the water injection assembly comprises a two-way motor, a base disc, a transmission rod, a rotating blade, a rotating disc, a synchronous groove, a small hole, a large hole and an annular groove. Constant-temperature hot water injected into the water injection cylinder sequentially passes through the rotating disc and the base disc, the hot water continuously injects small water flow into the filter cup through the small holes in the rotating disc and the annular groove in the base disc, and along with rotation of the rotating disc, the hot water intermittently injects large water flow into the filter cup through the large holes in the synchronous groove and the large holes in the base disc. Large water flow can ensure that the water level is prevented from rising rapidly while coffee powder is stirred; the continuous small water flow can continuously provide constant-temperature hot water for coffee powder, it is ensured that phenolic compounds sensitive to temperature change in coffee are stably decomposed, and the flavor level and taste of the coffee are ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of coffee extraction, and in particular relates to a coffee extraction device and an extraction method. Background Art

[0002] At present, the coffee extraction process mainly includes coffee machine extraction and hand-pour extraction. With the growing popularity of boutique coffee, the hand-pour extraction method is favored by more and more coffee lovers due to the flexibility of controlling extraction parameters. However, controlling the water flow during hand-pour is the key to affecting uniform extraction.

[0003] Existing water injection methods for coffee extraction mainly include large water flow injection, small water flow injection and segmented water injection; large water flow can quickly stir the coffee powder and promote uniform mixing of coffee powder and water, but it can also easily cause the water level to rise rapidly and drain too quickly, thereby shortening the extraction time and possibly causing insufficient extraction; small water flow is gentler than large water flow, and can avoid the risk of rapidly raising the water level and flooding, ensuring sufficient extraction, however, small water flow may also lead to insufficient stirring, reducing the stirring degree of the coffee powder, and further affecting the uniformity of extraction; the segmented water injection method usually uses a large water flow to inject water until the water level is slightly higher than the top of the powder layer, then pauses, and waits for the water level to drop before continuing to inject water. Segmented water injection is also a commonly used water injection method for hand-brewed coffee.

[0004] The following problems exist in segmented water injection: First, although using a large water flow to inject water can stir the coffee powder as a whole and make the coffee powder effectively stirred, the water level needs to be paused after it is slightly higher than the top of the powder layer, so that the stirred coffee powder cannot continue to diffuse through the water injection, resulting in poor diffusion of the coffee powder and prone to uneven extraction. Second, since the water injection cannot be continuous, the water temperature during the first water injection will be quickly absorbed by the coffee powder, causing the water temperature during the first water injection to drop rapidly, resulting in the water temperature during the second water injection being much higher than the water temperature during the first water injection. Under the large temperature difference, the decomposition amount of phenolic compounds in the coffee that are sensitive to temperature changes changes, resulting in a chaotic coffee flavor layer and affecting the coffee taste. Summary of the invention

[0005] The purpose of the present invention is to provide a coffee extraction device and an extraction method to solve the technical problems in the prior art.

[0006] The object of the present invention can be achieved by the following technical scheme: a coffee extraction device, comprising a base cylinder and a water injection cylinder located on the base cylinder, a cylinder cover is installed on the water injection cylinder, a water injection assembly is installed inside the water injection cylinder, a bracket is installed inside the base cylinder, a filter cup is placed inside the bracket, and a coffee cup is placed at the bottom of the filter cup; The water injection assembly includes a bidirectional motor and a base plate, the base plate is fixedly installed in the water injection cylinder, the output end of the bidirectional motor is connected to the transmission rod, the transmission rod is connected to the rotating blade, the turntable is rotatably installed on the base plate, the turntable is symmetrically provided with synchronous grooves, the rotating blade is installed in the turntable, the turntable is provided with small holes, large holes are provided inside the synchronous grooves and on the base plate, and annular grooves are provided between the large holes on the base plate; When the bidirectional motor drives the turntable to rotate through the rotating blades, the large hole inside the synchronous groove matches with the large hole on the base plate, and the small hole matches with the annular groove.

[0007] As a further optimization or improvement of this scheme, the distance from the center of the turntable to the center of the small hole is the short distance, the distance from the center of the turntable to the center of the large hole on the turntable is the long distance one, and the distance from the center of the base plate to the center of the large hole on the base plate is the long distance two, the long distance one is twice the short distance, and the long distance one is equal to the long distance two.

[0008] As a further optimization or improvement of this solution, a funnel is fixedly installed in the water injection cylinder, a liquid inlet is opened at the bottom of the funnel, a fixed guide sleeve is installed on the liquid inlet, a guide rod is slidably installed inside the fixed guide sleeve, and a top ring is installed on the guide rod; The transmission rod is connected to the rotating blade through a screw rod, the screw rod is in transmission connection with the blocking plate, a vertical groove is arranged on the blocking plate, and the top ring is slidably matched with the vertical groove through an insert block.

[0009] As a further optimization or improvement of the present solution, a bottom ring is installed on the guide rod, and the bottom ring is connected to the fixed guide sleeve via a return spring.

[0010] As a further optimization or improvement of this solution, a rotating ring is rotatably installed at the bottom of the blocking plate, a double-sided electromagnetic suction cup is installed on the top ring, a suction plate is vertically slidably installed inside the top ring and an insert block is horizontally slidably installed, the suction plate and the insert block are connected by a connecting rod, one end of the insert block is inserted into the vertical slot, and the other end of the insert block is connected to the inner wall of the top ring through a connecting spring; When the double-sided electromagnetic chuck is powered on, one end of the double-sided electromagnetic chuck attracts the rotating ring, and the other end of the double-sided electromagnetic chuck attracts the suction plate.

[0011] As a further optimization or improvement of the present solution, a high liquid level sensor and a low liquid level sensor are respectively installed on the bracket.

[0012] As a further optimization or improvement of the present solution, a motor cover mounted on the bidirectional motor is installed on the cylinder cover, and a timer is installed on the cylinder cover, and the timer is respectively connected to the high liquid level sensor, the low liquid level sensor and the bidirectional motor.

[0013] A coffee extraction method, the method is applied to the coffee extraction device as described above, the method comprising the following steps: Step S1: put a proper amount of coffee powder into the wetted filter cup, and then inject water into the water injection cylinder; Step S2: During extraction, the bidirectional motor rotates forward, and the bidirectional motor drives the rotating blade to rotate in the synchronous groove through the transmission rod; the large hole in the synchronous groove is in a conducting state, and as the bidirectional motor runs, the bidirectional motor drives the turntable to rotate synchronously through the rotating blade; Step S3: The constant temperature hot water injected into the water injection cylinder passes through the turntable and the base plate in sequence. Since the small holes on the turntable cooperate with the annular grooves on the base plate, the hot water continuously flows into the filter cup through the small holes on the turntable and the annular grooves on the base plate. Step S4: As the turntable rotates, the large holes in the synchronous groove overlap with the large holes on the base plate, and hot water is intermittently injected into the filter cup through the large holes in the synchronous groove and the large holes on the base plate.

[0014] As a further optimization or improvement of this solution, step S2 specifically includes the following steps: Step S21: During the extraction process, the highest water level and the lowest water level in the filter cup are detected by the high liquid level sensor and the low liquid level sensor respectively. When the water volume in the filter cup reaches the detection point of the high liquid level sensor, the high liquid level sensor controls the bidirectional motor to reverse. Step S22: The bidirectional motor drives the rotating blades to block the large hole inside the synchronous groove through the transmission rod. As the bidirectional motor runs, the rotating blades drive the turntable to reverse. At this time, only hot water is injected into the filter cup through the small holes on the turntable and the annular groove on the base plate. Step S23: while the bidirectional motor is reversing, the bidirectional motor drives the screw to rotate synchronously through the transmission rod. Since the plug on the top ring cooperates with the vertical groove on the blocking plate, the rotation of the screw drives the blocking plate to move toward the liquid inlet. As the blocking plate moves downward, the blocking plate gradually blocks the hot water from passing through the liquid inlet. Step S24: When the blocking plate is close to the top ring, the double-sided electromagnetic suction cup is energized, one end of the double-sided electromagnetic suction cup adsorbs the rotating ring at the bottom of the blocking plate, and the other end of the double-sided electromagnetic suction cup adsorbs the suction plate. While the suction plate is adsorbed, the plug block is pulled through the connecting rod to make the plug block disengage from the vertical groove on the blocking plate, thereby limiting the blocking plate.

[0015] Beneficial effects of the present invention: (1) As the bidirectional motor rotates forward, the bidirectional motor drives the rotating blade in the synchronous groove to rotate through the transmission rod, so that the large hole in the synchronous groove is in a conductive state. As the bidirectional motor runs, the bidirectional motor drives the turntable to rotate synchronously through the rotating blade; The constant temperature hot water injected into the water injection cylinder passes through the turntable and the base plate in turn. Due to the cooperation between the small holes on the turntable and the annular grooves on the base plate, the hot water is continuously injected into the filter cup through the small holes on the turntable and the annular grooves on the base plate in a small stream. As the turntable rotates, the large holes in the synchronous grooves coincide with the large holes on the base plate, and the hot water is intermittently injected into the filter cup through the large holes in the synchronous grooves and the large holes on the base plate in a large stream. The intermittent large stream of water can ensure that the coffee powder is stirred while avoiding a rapid increase in the water level, thereby ensuring sufficient extraction; the continuous small stream of water can continuously provide constant temperature hot water for the coffee powder, thereby ensuring the stable decomposition of phenolic compounds in the coffee that are sensitive to temperature changes, ensuring the flavor layering and taste of the coffee, and avoiding confusion in the flavor layering of the coffee caused by large water temperature differences.

[0016] Specifically, when a large water flow and a small water flow are injected into the coffee powder inside the filter cup at the same time, the flow rate difference formed by the large water flow and the small water flow accelerates the stirring and diffusion of the coffee powder inside the filter cup. When the large water flow stops, the small water flow continues to drive the coffee powder to diffuse, ensuring that the coffee powder can be evenly extracted.

[0017] (2) The present invention detects the highest water level and the lowest water level inside the filter cup respectively through a high liquid level sensor and a low liquid level sensor. When the water injection amount inside the filter cup reaches the detection point of the high liquid level sensor, the bidirectional motor reverses. At this time, the bidirectional motor drives the rotating blades through the transmission rod to block the large hole inside the synchronous groove. At this time, only hot water is injected into the filter cup through the small holes on the turntable and the annular groove on the base plate. The water inflow of the filter cup is reduced. At the same time, the bidirectional motor drives the screw to rotate synchronously through the transmission rod. The rotation of the screw drives the blocking plate to move close to the liquid inlet. As the blocking plate moves downward, the blocking plate gradually blocks the hot water from passing through the liquid inlet, reducing the flow rate of the small water flow through the small holes and the annular groove, thereby slowing down the amount of small water flow entering the filter cup. Specifically, when the blocking plate is close to the top ring, the double-sided electromagnetic suction cup is energized, one end of the double-sided electromagnetic suction cup adsorbs the rotating ring at the bottom of the blocking plate, and the other end of the double-sided electromagnetic suction cup adsorbs the suction plate. While the suction plate is adsorbed, the plug is pulled through the connecting rod to make the plug disengage from the vertical groove on the blocking plate, thereby limiting the blocking plate, preventing the blocking plate from blocking the liquid inlet, causing the coffee powder inside the filter cup to be cut off from water during the extraction process, resulting in an increase in the temperature difference of the water during segmented water injection, thereby affecting the taste of the coffee; In addition, if the double-sided electromagnetic suction cup is not energized, the blocking plate will drive the double-sided electromagnetic suction cup to move downward, so that the blocking plate blocks the liquid inlet. This state is used for steaming before extraction. In this state, the blocking time of the liquid inlet is set by the timer. When the timer ends, the timer controls the bidirectional motor to rotate forward, so that the liquid inlet opens, and then the extraction starts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0021] Figure 3 Schematic diagram of the overall structure of the water injection component.

[0022] Figure 4 Schematic diagram of the turntable and base plate structure.

[0023] Figure 5 This is a schematic diagram of the front structure of the turntable.

[0024] Figure 6 This is a schematic diagram of the front structure of the base.

[0025] Figure 7 Schematic diagram of the sealing plate and funnel structure.

[0026] Figure 8 This is a schematic diagram of the installation of the sealing plate and the funnel.

[0027] Fig. 9 It is a schematic diagram of the connection between the blocking plate and the fixed guide sleeve.

[0028] Fig.10 It is a schematic diagram of the transmission connection between the screw and the sealing plate.

[0029] Fig.11 for Fig.10 Schematic diagram of the structure of part A.

[0030] Fig.12 This is a schematic diagram of the installation position of the high liquid level sensor and the low liquid level sensor.

[0031] The following are marked in the figure: 1, base cylinder; 2, water injection cylinder; 3, motor cover; 4, timer; 5, cylinder cover; 6, water injection assembly; 601, bidirectional motor; 602, transmission rod; 603, rotating blade; 604, rotating disk; 605, synchronous groove; 606, base disk; 607, small hole; 608, large hole; 609, annular groove; 610, short distance; 611, long distance one; 612, long distance two; 613, funnel; 614, screw; 615, blocking plate; 616, liquid inlet; 618, swivel; 619, fixed guide sleeve; 620, guide rod; 621, top ring; 622, double-sided electromagnetic suction cup; 623, bottom ring; 624, reset spring; 625, vertical groove; 626, suction plate; 627, connecting spring; 628, plug; 629, connecting rod; 7, filter cup; 8, coffee cup; 9, bracket; 11, high liquid level sensor; 12, low liquid level sensor. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 9 A coffee extraction device, characterized in that it comprises a base cylinder 1 and a water injection cylinder 2 located on the base cylinder 1, a cylinder cover 5 is installed on the water injection cylinder 2, a water injection assembly 6 is installed inside the water injection cylinder 2, a bracket 9 is installed inside the base cylinder 1, a filter cup 7 is placed inside the bracket 9, and a coffee cup 8 is placed at the bottom of the filter cup 7; The water injection assembly 6 includes a bidirectional motor 601 and a base plate 606, the base plate 606 is fixedly installed in the water injection barrel 2, the output end of the bidirectional motor 601 is connected to the transmission rod 602, the transmission rod 602 is connected to the rotating blade 603, a rotating disk 604 is rotatably installed on the base plate 606, the rotating disk 604 is symmetrically provided with synchronous grooves 605, the rotating blade 603 is installed in the rotating disk 604, a small hole 607 is provided on the rotating disk 604, large holes 608 are provided inside the synchronous groove 605 and on the base plate 606, and an annular groove 609 is provided between the large holes 608 on the base plate 606; When the bidirectional motor 601 drives the rotating disk 604 to rotate through the rotating blade 603 , the large hole 608 inside the synchronous groove 605 cooperates with the large hole 608 on the base plate 606 , and the small hole 607 cooperates with the annular groove 609 .

[0034] Specifically, a funnel 613 is fixedly installed in the water injection cylinder 2, a liquid inlet 616 is provided at the bottom of the funnel 613, a fixed guide sleeve 619 is installed on the liquid inlet 616, a guide rod 620 is slidably installed inside the fixed guide sleeve 619, and a top ring 621 is installed on the guide rod 620; The transmission rod 602 is connected to the rotating blade 603 through the screw rod 614 , and the screw rod 614 is in transmission connection with the blocking plate 615 . The blocking plate 615 is provided with a vertical groove 625 , and the top ring 621 is slidably matched with the vertical groove 625 through the insert block 628 .

[0035] It should be noted that, as the bidirectional motor 601 rotates forward, the bidirectional motor 601 drives the rotating blade 603 to rotate in the synchronous groove 605 through the transmission rod 602, so that the rotating blade 603 rotates away from the large hole 608 inside the synchronous groove 605, so that the large hole 608 in the synchronous groove 605 is in a conducting state. As the bidirectional motor 601 runs, the bidirectional motor 601 drives the turntable 604 to rotate synchronously through the rotating blade 603. The constant temperature hot water injected into the water injection cylinder 2 passes through the turntable 604 and the base plate 606 in turn. Since the small hole 607 on the turntable 604 cooperates with the annular groove 609 on the base plate 606, the hot water is continuously injected into the filter cup 7 through the small hole 607 on the turntable 604 and the annular groove 609 on the base plate 606 in a small stream. As the turntable 604 rotates, the large hole 608 in the synchronous groove 605 coincides with the large hole 608 on the base plate 606, and the hot water is intermittently injected into the filter cup 7 through the large hole 608 in the synchronous groove 605 and the large hole 608 on the base plate 606 in a large stream. The intermittent large stream of water can ensure that the coffee powder is stirred while avoiding the water level from rising rapidly, thereby ensuring sufficient extraction; the continuous small stream of water can continuously provide constant temperature hot water for the coffee powder, ensure the stable decomposition of phenolic compounds in the coffee that are sensitive to temperature changes, ensure the coffee flavor layer and taste, and avoid the confusion of coffee flavor layers caused by large water temperature differences.

[0036] Specifically, when a large water flow and a small water flow are injected into the coffee powder inside the filter cup 7 at the same time, the flow rate difference formed by the large water flow and the small water flow accelerates the stirring and diffusion of the coffee powder inside the filter cup 7. When the large water flow stops, the small water flow continues to drive the coffee powder to diffuse, ensuring that the coffee powder can be evenly extracted.

[0037] It should be noted that see Figure 4 and Figure 5 The large holes 608 and the small holes 607 on the turntable 604 can be arranged alternately, thereby further improving the stirring efficiency of the coffee powder inside the filter cup 7.

[0038] See also Figure 10-11 The bottom of the blocking plate 615 is rotatably mounted with a rotating ring 618, a double-sided electromagnetic suction cup 622 is mounted on the top ring 621, a suction plate 626 is vertically slidably mounted inside the top ring 621, and an insert block 628 is horizontally slidably mounted therein, the suction plate 626 and the insert block 628 are connected by a connecting rod 629, one end of the insert block 628 is inserted into the vertical slot 625, and the other end of the insert block 628 is connected to the inner wall of the top ring 621 through a connecting spring 627; When the double-sided electromagnetic suction cup 622 is powered on, one end of the double-sided electromagnetic suction cup 622 attracts the rotating ring 618 , and the other end of the double-sided electromagnetic suction cup 622 attracts the suction plate 626 .

[0039] Specifically, a high liquid level sensor 11 and a low liquid level sensor 12 are respectively installed on the bracket 9 .

[0040] It should be noted that, according to personal preference and taste, coffee beans can be roughly ground into fine-ground coffee powder and coarse-ground coffee powder. Since the particle size of fine-ground coffee powder is small and the gaps between particles are also small, the speed at which water flows through the coffee powder is slow, in order to avoid water overflowing from the filter cup 7.

[0041] The present invention detects the highest water level and the lowest water level in the filter cup 7 respectively through the high liquid level sensor 11 and the low liquid level sensor 12. When the water injection amount in the filter cup 7 reaches the detection point of the high liquid level sensor 11, the high liquid level sensor 11 controls the bidirectional motor 601 to reverse. At this time, the bidirectional motor 601 drives the rotating blade 603 to block the large hole 608 in the synchronous groove 605 through the transmission rod 602. As the bidirectional motor 601 runs, the rotating blade 603 drives the rotating disk 604 to reverse. At this time, only hot water passes through the small hole 607 on the rotating disk 604 and the small hole 608 on the base plate 606. The annular groove 609 injects a small water flow into the filter cup 7 to reduce the water inflow of the filter cup 7. At the same time, the bidirectional motor 601 drives the screw 614 to rotate synchronously through the transmission rod 602. Since the plug 628 on the top ring 621 cooperates with the vertical groove 625 on the blocking plate 615, the screw 614 rotates to drive the blocking plate 615 to move toward the liquid inlet 616. As the blocking plate 615 moves downward, the blocking plate 615 gradually blocks the hot water from passing through the liquid inlet 616, reducing the flow rate of the small water flow through the small hole 607 and the annular groove 609, thereby slowing down the amount of the small water flow entering the filter cup 7. When the blocking plate 615 is close to the top ring 621, the double-sided electromagnetic suction cup 622 is energized, and one end of the double-sided electromagnetic suction cup 622 adsorbs the rotating ring 618 at the bottom of the blocking plate 615, and the other end of the double-sided electromagnetic suction cup 622 adsorbs the suction plate 626. While the suction plate 626 is adsorbed, the plug block 628 is pulled through the connecting rod 629, so that the plug block 628 is separated from the vertical groove 625 on the blocking plate 615, thereby limiting the blocking plate 615, preventing the blocking plate 615 from blocking the liquid inlet 616, causing the coffee powder inside the filter cup 7 to be cut off from water during the extraction process, resulting in an increase in the temperature difference of the water during the segmented water injection, thereby affecting the taste of the coffee.

[0042] If the double-sided electromagnetic suction cup 622 is not energized, the blocking plate 615 will drive the double-sided electromagnetic suction cup 622 to move downward, so that the blocking plate 615 blocks the liquid inlet 616. This state is applied to the steaming before extraction. In order to improve the taste of coffee, it is usually necessary to steam the coffee powder during extraction. In this state, the blocking time of the liquid inlet 616, that is, the steaming time of the coffee powder, is set by the timer 4. When the timer 4 ends, the timer 4 controls the two-way motor 601 to rotate forward, so that the two-way motor 601 drives the blocking plate 615 away from the liquid inlet 616 through the screw 614, and the liquid inlet 616 is opened, and then the extraction starts.

[0043] When the low liquid level sensor 12 detects that the water level inside the filter cup 7 reaches the lowest water level, the low liquid level sensor 12 controls the bidirectional motor 601 to rotate forward.

[0044] See also Figure 4-Figure 6The distance from the center of the turntable 604 to the center of the small hole 607 is the short distance 610, the distance from the center of the turntable 604 to the center of the large hole 608 on the turntable 604 is the long distance one 611, and the distance from the center of the base plate 606 to the center of the large hole 608 on the base plate 606 is the long distance two 612. The long distance one 611 is twice the short distance 610, and the long distance one 611 is equal to the long distance two 612.

[0045] It should be noted that since the long distance 1 611 is twice the short distance 610, the long distance 1 611 is equal to the long distance 2 612. When the turntable 604 rotates, the small hole 607 on the turntable 604 and the large hole 608 on the base plate 606 do not interfere with each other. When the turntable 604 rotates, the small hole 607 cooperates with the annular groove 609, and the large hole 608 in the synchronous groove 605 cooperates with the large hole 608 on the base plate 606.

[0046] See also Figure 8-Figure 9 A bottom ring 623 is installed on the guide rod 620 , and the bottom ring 623 is connected to the fixed guide sleeve 619 through a return spring 624 .

[0047] It should be noted that the reset spring 624 is used to reset the top ring 621. When the bidirectional motor 601 drives the blocking plate 615 to move upward through the screw 614, the reset spring 624 rebounds to drive the top ring 621 to reset.

[0048] See also Figure 1 , Figure 2 and Fig.12 The cylinder cover 5 is provided with a motor cover 3 sleeved on the bidirectional motor 601, and a timer 4 is provided on the cylinder cover 5. The timer 4 is respectively connected to the high liquid level sensor 11, the low liquid level sensor 12 and the bidirectional motor 601.

[0049] It should be noted that, when in use, a proper amount of coffee powder is put into the moistened filter cup 7, and then water is poured into the water injection cylinder 2, and the water temperature is determined according to the flavor of the coffee.

[0050] See also Figure 1-Figure 8 As shown, the present invention is a coffee extraction method, which is applied to the coffee extraction device as described in the above embodiment, and the method comprises the following steps: Step S1: Take a proper amount of coffee powder and put it into the wetted filter cup 7, and then inject water into the water injection cylinder 2; Step S2: During extraction, the bidirectional motor 601 rotates forward, and the bidirectional motor 601 drives the rotating blade 603 to rotate in the synchronous groove 605 through the transmission rod 602; the large hole 608 in the synchronous groove 605 is in a conducting state, and as the bidirectional motor 601 runs, the bidirectional motor 601 drives the rotating disk 604 to rotate synchronously through the rotating blade 603; Step S3: The constant temperature hot water injected into the water injection cylinder 2 passes through the rotating disk 604 and the base disk 606 in sequence. Since the small hole 607 on the rotating disk 604 cooperates with the annular groove 609 on the base disk 606, the hot water continuously flows into the filter cup 7 through the small hole 607 on the rotating disk 604 and the annular groove 609 on the base disk 606; Step S4: As the turntable 604 rotates, the large hole 608 in the synchronous groove 605 overlaps with the large hole 608 on the base plate 606, and hot water is intermittently injected into the filter cup 7 through the large hole 608 in the synchronous groove 605 and the large hole 608 on the base plate 606.

[0051] See also Figure 7-Figure 12 As shown, as a preferred embodiment of the present invention, step S2 specifically includes the following steps: Step S21: During the extraction process, the highest water level and the lowest water level in the filter cup 7 are detected by the high liquid level sensor 11 and the low liquid level sensor 12 respectively. When the water injection amount in the filter cup 7 reaches the detection point of the high liquid level sensor 11, the high liquid level sensor 11 controls the bidirectional motor 601 to reverse. Step S22: The bidirectional motor 601 drives the rotating blade 603 to block the large hole 608 in the synchronous groove 605 through the transmission rod 602. As the bidirectional motor 601 runs, the rotating blade 603 drives the rotating disk 604 to reverse. At this time, only hot water is injected into the filter cup 7 through the small hole 607 on the rotating disk 604 and the annular groove 609 on the base plate 606. Step S23: while the bidirectional motor 601 is reversed, the bidirectional motor 601 drives the screw 614 to rotate synchronously through the transmission rod 602. Since the insert block 628 on the top ring 621 cooperates with the vertical slot 625 on the blocking plate 615, the screw 614 rotates to drive the blocking plate 615 to move toward the liquid inlet 616. As the blocking plate 615 moves downward, the blocking plate 615 gradually blocks the hot water from passing through the liquid inlet 616. Step S24: When the sealing plate 615 is close to the top ring 621, the double-sided electromagnetic suction cup 622 is energized, one end of the double-sided electromagnetic suction cup 622 adsorbs the rotating ring 618 at the bottom of the sealing plate 615, and the other end of the double-sided electromagnetic suction cup 622 adsorbs the suction plate 626. While the suction plate 626 is adsorbed, the plug block 628 is pulled through the connecting rod 629, so that the plug block 628 is separated from the vertical slot 625 on the sealing plate 615, thereby limiting the sealing plate 615.

[0052] The implementation principle of the present invention is as follows: when in use, take a proper amount of coffee powder and put it into the wet filter cup 7, then fill water into the water injection cylinder 2, start the bidirectional motor 601 to rotate forward, the bidirectional motor 601 drives the rotating blade 603 located in the synchronous groove 605 to rotate through the transmission rod 602, so that the rotating blade 603 rotates away from the large hole 608 in the synchronous groove 605, so that the large hole 608 in the synchronous groove 605 is in a conducting state, and as the bidirectional motor 601 runs, the bidirectional motor 601 drives the rotating disk 604 to rotate synchronously through the rotating blade 603; The constant temperature hot water injected into the water injection cylinder 2 passes through the turntable 604 and the base plate 606 in sequence. Since the small hole 607 on the turntable 604 cooperates with the annular groove 609 on the base plate 606, the hot water continuously injects a small water flow into the filter cup 7 through the small hole 607 on the turntable 604 and the annular groove 609 on the base plate 606. As the turntable 604 rotates, the large hole 608 in the synchronous groove 605 coincides with the large hole 608 on the base plate 606, and the hot water intermittently injects a large water flow into the filter cup 7 through the large hole 608 in the synchronous groove 605 and the large hole 608 on the base plate 606. The intermittent large water flow can ensure that the coffee powder is stirred while avoiding the water level from rising rapidly, ensuring sufficient extraction; the continuous small water flow can continuously provide constant temperature hot water for the coffee powder, ensuring the stable decomposition of phenolic compounds in the coffee that are sensitive to temperature changes, ensuring the coffee flavor level and taste, and avoiding the confusion of coffee flavor levels caused by large water temperature differences; Specifically, when a large water flow and a small water flow are injected into the coffee powder inside the filter cup 7 at the same time, the flow rate difference formed by the large water flow and the small water flow accelerates the stirring and diffusion of the coffee powder inside the filter cup 7. When the large water flow stops, the small water flow continues to drive the coffee powder to diffuse, ensuring that the coffee powder can be evenly extracted.

[0053] During the extraction process, the highest water level and the lowest water level in the filter cup 7 are detected by the high liquid level sensor 11 and the low liquid level sensor 12 respectively. When the water injection amount in the filter cup 7 reaches the detection point of the high liquid level sensor 11, the high liquid level sensor 11 controls the bidirectional motor 601 to reverse. At this time, the bidirectional motor 601 drives the rotating blade 603 to block the large hole 608 in the synchronous groove 605 through the transmission rod 602. As the bidirectional motor 601 runs, the rotating blade 603 drives the rotating disk 604 to reverse. At this time, only hot water passes through the small hole 607 on the rotating disk 604 and the annular groove 608 on the base plate 606. 9 injects a small water flow into the filter cup 7 to reduce the water inflow of the filter cup 7. At the same time, the bidirectional motor 601 drives the screw 614 to rotate synchronously through the transmission rod 602. Since the plug 628 on the top ring 621 cooperates with the vertical groove 625 on the blocking plate 615, the screw 614 rotates to drive the blocking plate 615 to move toward the liquid inlet 616. As the blocking plate 615 moves downward, the blocking plate 615 gradually blocks the hot water from passing through the liquid inlet 616, reducing the flow rate of the small water flow through the small hole 607 and the annular groove 609, thereby slowing down the amount of the small water flow entering the filter cup 7 and preventing the water flow from overflowing from the filter cup 7. When the blocking plate 615 is close to the top ring 621, the double-sided electromagnetic suction cup 622 is energized, and one end of the double-sided electromagnetic suction cup 622 adsorbs the rotating ring 618 at the bottom of the blocking plate 615, and the other end of the double-sided electromagnetic suction cup 622 adsorbs the suction plate 626. While the suction plate 626 is adsorbed, the plug block 628 is pulled through the connecting rod 629, so that the plug block 628 is separated from the vertical groove 625 on the blocking plate 615, thereby limiting the blocking plate 615, preventing the blocking plate 615 from blocking the liquid inlet 616, causing the coffee powder inside the filter cup 7 to be cut off from water during the extraction process, resulting in an increase in the temperature difference of the water during the segmented water injection, thereby affecting the taste of the coffee.

[0054] In addition, if the double-sided electromagnetic suction cup 622 is not energized, the blocking plate 615 will drive the double-sided electromagnetic suction cup 622 to move downward, so that the blocking plate 615 blocks the liquid inlet 616. This state is applied to the steaming before extraction. In order to improve the taste of the coffee, it is usually necessary to steam the coffee powder during extraction. In this state, the blocking time of the liquid inlet 616, that is, the steaming time of the coffee powder, is set by the timer 4. When the timer 4 ends, the timer 4 controls the two-way motor 601 to rotate forward, so that the two-way motor 601 drives the blocking plate 615 away from the liquid inlet 616 through the screw 614. The liquid inlet 616 is opened, and then the extraction starts.

[0055] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A coffee extraction device, characterized in that: The invention comprises a base cylinder (1) and a water injection cylinder (2) located on the base cylinder (1), a cylinder cover (5) being installed on the water injection cylinder (2), a water injection assembly (6) being installed inside the water injection cylinder (2), a bracket (9) being installed inside the base cylinder (1), a filter cup (7) being placed inside the bracket (9), and a coffee cup (8) being placed at the bottom of the filter cup (7); The water injection assembly (6) comprises a bidirectional motor (601) and a base plate (606), wherein the base plate (606) is fixedly installed in the water injection cylinder (2), the output end of the bidirectional motor (601) is connected to a transmission rod (602), the transmission rod (602) is connected to a rotating blade (603), a rotating disk (604) is rotatably installed on the base plate (606), synchronous grooves (605) are symmetrically provided on the rotating disk (604), the rotating blade (603) is installed in the rotating disk (604), a small hole (607) is provided on the rotating disk (604), large holes (608) are provided inside the synchronous groove (605) and on the base plate (606), and an annular groove (609) is provided between the large holes (608) on the base plate (606); When the bidirectional motor (601) drives the rotating disk (604) to rotate via the rotating blade (603), the large hole (608) inside the synchronous groove (605) cooperates with the large hole (608) on the base disk (606), and the small hole (607) cooperates with the annular groove (609).

2. A coffee extraction device according to claim 1, characterized in that: The distance from the center of the rotating disk (604) to the center of the small hole (607) is the short distance (610), the distance from the center of the rotating disk (604) to the center of the large hole (608) on the rotating disk (604) is the long distance one (611), and the distance from the center of the base disk (606) to the center of the large hole (608) on the base disk (606) is the long distance two (612), the long distance one (611) is twice the short distance (610), and the long distance one (611) is equal to the long distance two (612).

3. The coffee extraction device according to claim 1, characterized in that: A funnel (613) is fixedly installed inside the water injection cylinder (2), a liquid inlet (616) is provided at the bottom of the funnel (613), a fixed guide sleeve (619) is installed on the liquid inlet (616), a guide rod (620) is slidably installed inside the fixed guide sleeve (619), and a top ring (621) is installed on the guide rod (620); The transmission rod (602) is connected to the rotating blade (603) via a screw rod (614), the screw rod (614) is transmission-connected to the blocking plate (615), a vertical groove (625) is provided on the blocking plate (615), and the top ring (621) is slidably matched with the vertical groove (625) via an insert block (628).

4. The coffee extraction device according to claim 3, characterized in that: A bottom ring (623) is mounted on the guide rod (620), and the bottom ring (623) is connected to the fixed guide sleeve (619) via a return spring (624).

5. The coffee extraction device according to claim 4, characterized in that: A rotating ring (618) is rotatably installed at the bottom of the blocking plate (615), a double-sided electromagnetic suction cup (622) is installed on the top ring (621), a suction plate (626) is vertically slidably installed inside the top ring (621) and an insert block (628) is horizontally slidably installed inside the top ring (621), the suction plate (626) and the insert block (628) are connected by a connecting rod (629), one end of the insert block (628) is inserted into the vertical slot (625), and the other end of the insert block (628) is connected to the inner wall of the top ring (621) via a connecting spring (627); When the double-sided electromagnetic suction cup (622) is powered on, one end of the double-sided electromagnetic suction cup (622) attracts the rotating ring (618), and the other end of the double-sided electromagnetic suction cup (622) attracts the suction plate (626).

6. The coffee extraction device according to claim 1, characterized in that: A high liquid level sensor (11) and a low liquid level sensor (12) are respectively mounted on the bracket (9).

7. The coffee extraction device according to claim 1, characterized in that: The cylinder cover (5) is provided with a motor cover (3) sleeved on the bidirectional motor (601), and a timer (4) is provided on the cylinder cover (5). The timer (4) is respectively connected to the high liquid level sensor (11), the low liquid level sensor (12) and the bidirectional motor (601).

8. A coffee extraction method, characterized in that: The method is applied to the coffee extraction device as described in any one of claims 1 to 7 above, and the method comprises the following steps: Step S1: taking an appropriate amount of coffee powder and placing it into the moistened filter cup (7), and then injecting water into the water injection cylinder (2); Step S2: During extraction, the bidirectional motor (601) rotates forward, and the bidirectional motor (601) drives the rotating blade (603) located in the synchronous groove (605) to rotate through the transmission rod (602); the large hole (608) in the synchronous groove (605) is in a conducting state, and as the bidirectional motor (601) runs, the bidirectional motor (601) drives the rotating disk (604) to rotate synchronously through the rotating blade (603); Step S3: The constant temperature hot water injected into the water injection cylinder (2) passes through the rotating disk (604) and the base disk (606) in sequence. Since the small hole (607) on the rotating disk (604) cooperates with the annular groove (609) on the base disk (606), the hot water continuously flows into the filter cup (7) through the small hole (607) on the rotating disk (604) and the annular groove (609) on the base disk (606); Step S4: As the rotating disk (604) rotates, the large hole (608) in the synchronous groove (605) overlaps with the large hole (608) on the base plate (606), and hot water is intermittently injected into the filter cup (7) through the large hole (608) in the synchronous groove (605) and the large hole (608) on the base plate (606).

9. A coffee extraction method according to claim 8, characterized in that: The step S2 specifically includes the following steps: Step S21: During the extraction process, the highest water level and the lowest water level inside the filter cup (7) are detected respectively by the high liquid level sensor (11) and the low liquid level sensor (12). When the amount of water injected into the filter cup (7) reaches the detection point of the high liquid level sensor (11), the high liquid level sensor (11) controls the bidirectional motor (601) to reverse. Step S22: the bidirectional motor (601) drives the rotating blade (603) to block the large hole (608) inside the synchronization groove (605) through the transmission rod (602). As the bidirectional motor (601) runs, the rotating blade (603) drives the rotating disk (604) to reverse. At this time, only hot water is injected into the filter cup (7) through the small hole (607) on the rotating disk (604) and the annular groove (609) on the base plate (606). Step S23: while the bidirectional motor (601) is rotating in reverse, the bidirectional motor (601) drives the screw rod (614) to rotate synchronously via the transmission rod (602); since the plug block (628) on the top ring (621) cooperates with the vertical groove (625) on the blocking plate (615), the screw rod (614) rotates to drive the blocking plate (615) to move toward the liquid inlet (616); as the blocking plate (615) moves downward, the blocking plate (615) gradually blocks the hot water from passing through the liquid inlet (616); Step S24: When the blocking plate (615) is close to the top ring (621), the double-sided electromagnetic suction cup (622) is energized, one end of the double-sided electromagnetic suction cup (622) adsorbs the rotating ring (618) at the bottom of the blocking plate (615), and the other end of the double-sided electromagnetic suction cup (622) adsorbs the suction plate (626). While the suction plate (626) is adsorbed, the plug block (628) is pulled through the connecting rod (629), so that the plug block (628) is separated from the vertical groove (625) on the blocking plate (615), thereby limiting the blocking plate (615).

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