A coffee extraction device and method

Abstract

The present application belongs to the technical field of coffee extraction, and particularly relates to a coffee extraction device and an extraction method, which comprise a base cylinder and a water injection cylinder located on the base cylinder, and a water injection assembly is installed inside the water injection cylinder; the water injection assembly comprises a bidirectional motor, a base disc, a transmission rod, a rotating blade, a rotating disc, a synchronization groove, a small hole, a large hole and an annular groove. The constant-temperature hot water injected into the water injection cylinder passes through the rotating disc and the base disc in sequence, and the hot water continuously injects a small water flow into a filter cup through the small hole on the rotating disc and the annular groove on the base disc. With the rotation of the rotating disc, the hot water intermittently injects a large water flow into the filter cup through the large hole in the synchronization groove and the large hole on the base disc, which can ensure the stirring of coffee powder while avoiding the rapid rise of water level. The continuous small water flow can continuously provide constant-temperature hot water for the coffee powder, ensure the stable decomposition of phenolic compounds sensitive to temperature changes in coffee, and guarantee the flavor levels and taste of coffee.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coffee extraction, and particularly relates to a coffee extraction device and an extraction method. BACKGROUND

[0002] At present, the extraction process of coffee mainly includes coffee machine extraction and hand-pouring extraction. With the increasing popularity of specialty coffee, the hand-pouring extraction method is favored by more and more coffee lovers due to the flexibility of extraction parameter control. However, the water flow during hand-pouring is the key to uniform extraction.

[0003] The existing water injection methods for coffee extraction mainly include large water flow injection, small water flow injection and segmented injection. The large water flow can quickly stir the coffee powder and promote the uniform mixing of the coffee powder and water, but it can also cause the water level to rise rapidly and the drainage to be too fast, thereby shortening the extraction time and possibly leading to insufficient extraction. The small water flow is more gentle than the large water flow, which can avoid the risk of rapidly increasing the water level and flooding, and ensure sufficient extraction. However, the small water flow can also lead to insufficient stirring, which reduces the stirring degree of the coffee powder and affects the uniformity of extraction. The segmented injection method usually uses large water flow to inject water until the water level is slightly higher than the top of the powder layer, then pauses, waits for the water level to drop, and then continues to inject water. The segmented injection is also a commonly used water injection method for hand-pouring coffee.

[0004] The segmented injection has the following problems:

[0005] Firstly, although the use of large water flow injection can stir the coffee powder as a whole and effectively stir the coffee powder, the coffee powder cannot continue to be diffused by injection after the water level is slightly higher than the top of the powder layer and needs to be paused, which leads to poor diffusivity of the coffee powder and easy occurrence of uneven extraction. Secondly, since the injection cannot be continuous, the water temperature during the first injection will be quickly absorbed by the coffee powder, causing the water temperature during the first injection to quickly drop, and the water temperature during the second injection to be much higher than that during the first injection. Under the large temperature difference, the decomposition amount of the phenolic compounds in the coffee which are sensitive to temperature change changes, leading to chaotic flavor levels of the coffee and affecting the taste of the coffee. SUMMARY

[0006] The present application aims to solve the technical problems in the prior art by providing a coffee extraction device and an extraction method.

[0007] The technical problems can be solved by the following technical solutions: a coffee extraction device, comprising a base cylinder and a water injection cylinder located on the base cylinder, a cylinder cover installed on the water injection cylinder, a water injection assembly installed inside the water injection cylinder, a support installed in the base cylinder, a filter cup placed in the support, and a coffee cup placed at the bottom of the filter cup.

[0008] The water injection assembly comprises a bidirectional motor and a base disc fixedly installed in the water injection cylinder, the output end of the bidirectional motor is connected with a transmission rod, the transmission rod is connected with a rotating blade, a rotating disc is rotatably installed on the base disc, symmetrical synchronous grooves are formed on the rotating disc, the rotating blade is installed in the rotating disc, a small hole is formed on the rotating disc, a large hole is formed in the synchronous groove and on the base disc, and an annular groove is formed between the large holes on the base disc.

[0009] When the bidirectional motor drives the rotating disc to rotate through the rotating blade, the large hole in the synchronous groove cooperates with the large hole on the base disc, and the small hole cooperates with the annular groove.

[0010] As a further optimization or improvement of the present scheme, the distance from the center of the rotating disc to the center of the small hole is a short distance, the distance from the center of the rotating disc to the center of the large hole on the rotating disc is a long distance one, the distance from the center of the base disc to the center of the large hole on the base disc is a long distance two, the long distance one is twice the short distance, and the long distance one is equal to the long distance two.

[0011] As a further optimization or improvement of the present scheme, a funnel is fixedly installed in the water injection cylinder, a liquid inlet is formed at the bottom of the funnel, a fixed guide sleeve is installed on the liquid inlet, a guide rod is slidably installed in the fixed guide sleeve, and a top ring is installed on the guide rod.

[0012] The transmission rod is connected between the screw rod and the rotating blade, the screw rod is in transmission connection with the blocking plate, a vertical groove is formed on the blocking plate, and the top ring is in sliding connection with the vertical groove through the insertion block.

[0013] As a further optimization or improvement of the present scheme, a bottom ring is installed on the guide rod, and the bottom ring is connected with the fixed guide sleeve through a return spring.

[0014] As a further optimization or improvement of the present scheme, a rotating ring is rotatably installed at the bottom of the blocking plate, a double-sided electromagnetic suction disc is installed on the top ring, a suction plate and an insertion block are respectively vertically and horizontally slidably installed in the top ring, the suction plate and the insertion block are connected through a connecting rod, one end of the insertion block is inserted into the vertical groove, and the other end of the insertion block is connected with the inner wall of the top ring through a connecting spring.

[0015] When the double-sided electromagnetic suction disc is powered on, one end of the double-sided electromagnetic suction disc attracts the rotating ring, and the other end of the double-sided electromagnetic suction disc attracts the suction plate.

[0016] As a further optimization or improvement of the present scheme, a high liquid level sensor and a low liquid level sensor are respectively installed on the support.

[0017] As a further optimization or improvement of the present scheme, a motor cover is installed on the cylinder cover and covers the bidirectional motor, a timer is installed on the cylinder cover, and the timer is connected with the high liquid level sensor, the low liquid level sensor and the bidirectional motor.

[0018] A coffee extraction method, the method is applied to the coffee extraction device as described above, the method comprises the following steps:

[0019] Step S1: take the right amount of coffee powder into the wet filter cup, then inject water into the water injection cylinder;

[0020] Step S2: during extraction, the bidirectional motor rotates forward, 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 conductive state, and as the bidirectional motor operates, the bidirectional motor drives the rotating disc to rotate synchronously through the rotating blade;

[0021] Step S3: the constant-temperature hot water injected into the water injection cylinder passes through the rotating disc and the base disc in turn, and as the small holes on the rotating disc cooperate with the ring grooves on the base disc, the hot water continuously passes through the small holes on the rotating disc and the ring grooves on the base disc to inject small water streams into the filter cup;

[0022] Step S4: as the rotating disc rotates, the large hole in the synchronous groove coincides with the large hole on the base disc, and the hot water intermittently passes through the large hole in the synchronous groove and the large hole on the base disc to inject large water streams into the filter cup.

[0023] As a further optimization or improvement of the present scheme, the step S2 specifically comprises the following steps:

[0024] Step S21: during extraction, 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 injection amount 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;

[0025] Step S22: the bidirectional motor drives the rotating blade to block the large hole in the synchronous groove through the transmission rod, and as the bidirectional motor operates, the rotating blade drives the rotating disc to reverse, at this time, only the hot water passes through the small holes on the rotating disc and the ring grooves on the base disc to inject small water streams into the filter cup;

[0026] Step S23: while the bidirectional motor reverses, the bidirectional motor drives the screw rod to rotate synchronously through the transmission rod, and as the insert block on the top ring cooperates with the vertical groove on the blocking plate, the screw rod rotating drives the blocking plate to move towards the liquid inlet, and as the blocking plate moves downward, the blocking plate gradually hinders the hot water from passing through the liquid inlet;

[0027] Step S24: when the blocking plate approaches the top ring, the double-sided electromagnetic suction disc is powered on, one end of the double-sided electromagnetic suction disc adsorbs the rotating ring at the bottom of the blocking plate, and the other end of the double-sided electromagnetic suction disc adsorbs the suction plate, and the suction plate is adsorbed while pulling the insert block through the connecting rod to make the insert block separate from the vertical groove on the blocking plate, thereby limiting the blocking plate.

[0028] The beneficial effects of the present application are as follows:

[0029] (1) as the bidirectional motor rotates forward, the bidirectional motor drives the rotating blade to rotate in the synchronous groove through the transmission rod, and the large hole in the synchronous groove is in a conductive state, and as the bidirectional motor operates, the bidirectional motor drives the rotating disc to rotate synchronously through the rotating blade;

[0030] The constant-temperature hot water injected into the inside of the water injection cylinder passes through the rotating disc and the base disc in turn, and due to the cooperation of the small holes on the rotating disc and the annular grooves on the base disc, the hot water continuously injects small water flow into the filter cup through the small holes on the rotating disc and the annular grooves on the base disc, with the rotation of the rotating disc, the large holes in the synchronous grooves coincide with the large holes on the base disc, and the hot water intermittently injects large water flow into the inside of the filter cup through the large holes in the synchronous grooves and the large holes on the base disc, the intermittent large water flow can ensure the coffee powder to be stirred while avoiding the water level to be rapidly increased, and ensure the full extraction; the continuous small water flow can continuously provide constant-temperature hot water for the coffee powder, ensure the stable decomposition of the phenolic compounds in the coffee which are sensitive to temperature change, guarantee the coffee flavor level and taste, and avoid the coffee flavor level to be chaotic due to large water temperature difference.

[0031] Specifically, when the large water flow and the small water flow are simultaneously injected into the coffee powder in the inside of the filter cup, the flow rate difference formed by the large water flow and the small water flow accelerates the stirring and diffusion of the coffee powder in the inside of the filter cup, and after the large water flow stops, the small water flow continuously drives the diffusion of the coffee powder, so that the coffee powder can be uniformly extracted.

[0032] (2) The highest water level and the lowest water level in the inside of the filter cup are detected by the high liquid level sensor and the low liquid level sensor respectively, when the water injection amount in the inside of 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 leaf to block the large holes in the synchronous grooves through the transmission rod, at this time, only the hot water injects the small water flow into the inside of the filter cup through the small holes on the rotating disc and the annular grooves on the base disc, so that the water inflow amount of the filter cup is reduced, and at the same time, the bidirectional motor drives the screw rod to rotate synchronously through the transmission rod, the screw rod drives the blocking plate to move towards the liquid inlet, with the downward movement of the blocking plate, the blocking plate gradually hinders the hot water to pass through the liquid inlet, so that the flow rate of the small water flow passing through the small holes and the annular grooves is reduced, and then the amount of the small water flow entering the filter cup is slowed down;

[0033] Specifically, when the blocking plate approaches the top ring, the double-sided electromagnetic suction disc is electrified, one end of the double-sided electromagnetic suction disc adsorbs the rotating ring at the bottom of the blocking plate, and the other end of the double-sided electromagnetic suction disc adsorbs the suction plate, the suction plate is adsorbed at the same time, and the plug is pulled away from the vertical slot on the blocking plate through the connecting rod, so that the blocking of the blocking plate is limited, and the blocking plate is prevented from blocking the liquid inlet, so that the coffee powder in the inside of the filter cup is not interrupted by water during the extraction process, the water temperature difference during the segmented water injection is increased, and then the coffee taste is affected;

[0034] In addition, if the double-sided electromagnetic suction disc is not electrified, the blocking plate will drive the double-sided electromagnetic suction disc to move downward, so that the blocking plate blocks the liquid inlet, this state is applied to the steaming before extraction, in this state, the blocking time of the liquid inlet is set through the timer, and when the timer ends, the timer controls the bidirectional motor to rotate in the positive direction, so that the liquid inlet is opened, and then the extraction is started. BRIEF DESCRIPTION OF DRAWINGS

[0035] The application will be further described in conjunction with the drawings.

[0036] Figure 1 The application is a schematic diagram of the overall structure.

[0037] Figure 2 The application is a schematic diagram of the internal structure.

[0038] Figure 3 The application is a schematic diagram of the overall structure of the water injection assembly.

[0039] Figure 4 The application is a schematic diagram of the overall structure of the water injection assembly.

[0040] Figure 5 The application is a schematic diagram of the overall structure of the water injection assembly.

[0041] Figure 6 The application is a schematic diagram of the overall structure of the water injection assembly.

[0042] Figure 7 The application is a schematic diagram of the overall structure of the water injection assembly.

[0043] Figure 8 The application is a schematic diagram of the overall structure of the water injection assembly.

[0044] Figure 9 The application is a schematic diagram of the overall structure of the water injection assembly.

[0045] Figure 10 The application is a schematic diagram of the overall structure of the water injection assembly.

[0046] Figure 11 The application is a schematic diagram of the overall structure of the water injection assembly. Figure 10 The application is a schematic diagram of the overall structure of the water injection assembly.

[0047] Figure 12 The application is a schematic diagram of the overall structure of the water injection assembly.

[0048] The application is a schematic diagram of the overall structure of the water injection assembly. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0050] Referring to Figures 1-9 A coffee extraction device is characterized by comprising a base cylinder 1 and a water injection cylinder 2 on the base cylinder 1, a cylinder cover 5 mounted on the water injection cylinder 2, a water injection assembly 6 mounted inside the water injection cylinder 2, a support 9 mounted in the base cylinder 1, a filter cup 7 placed in the support 9, and a coffee cup 8 placed at the bottom of the filter cup 7.

[0051] The water injection assembly 6 comprises a bidirectional motor 601 and a base disc 606, the base disc 606 is fixedly installed in the water injection cylinder 2, the output end of the bidirectional motor 601 is connected with a transmission rod 602, the transmission rod 602 is connected with a rotating blade 603, a rotating disc 604 is rotatably installed on the base disc 606, symmetrical grooves 605 are formed on the rotating disc 604, the rotating blade 603 is installed in the rotating disc 604, a small hole 607 is formed on the rotating disc 604, large holes 608 are formed in the symmetrical grooves 605 and on the base disc 606, and an annular groove 609 is formed between the large holes 608 on the base disc 606.

[0052] When the bidirectional motor 601 drives the rotating disc 604 to rotate through the rotating blade 603, the large holes 608 in the symmetrical grooves 605 cooperate with the large holes 608 on the base disc 606, and the small hole 607 cooperates with the annular groove 609.

[0053] Specifically, a funnel 613 is fixedly installed in the water injection cylinder 2, a liquid inlet 616 is formed 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 in the fixed guide sleeve 619, and a top ring 621 is installed on the guide rod 620.

[0054] The transmission rod 602 is connected between the rotating blade 603 and the screw rod 614, the screw rod 614 is in transmission connection with a blocking plate 615, a vertical groove 625 is formed on the blocking plate 615, and the top ring 621 is in sliding connection with the vertical groove 625 through an insertion block 628.

[0055] It should be noted that when the bidirectional motor 601 rotates forward, the bidirectional motor 601 drives the rotating blade 603 to rotate in the symmetrical groove 605 through the transmission rod 602, so that the rotating blade 603 rotates away from the large hole 608 in the symmetrical groove 605, and the large hole 608 in the symmetrical groove 605 is in a conductive state.

[0056] The constant temperature hot water injected into the inside of the water injection cylinder 2 passes through the rotating disc 604 and the base disc 606 in turn. Due to the cooperation of the small holes 607 on the rotating disc 604 and the annular grooves 609 on the base disc 606, the hot water continuously passes through the small holes 607 on the rotating disc 604 and the annular grooves 609 on the base disc 606 to inject a small water flow into the filter cup 7. As the rotating disc 604 rotates, the large holes 608 in the synchronous groove 605 coincide with the large holes 608 on the base disc 606, and the hot water intermittently passes through the large holes 608 in the synchronous groove 605 and the large holes 608 on the base disc 606 to inject a large water flow into the inside of the filter cup 7. The intermittent large water flow can ensure the coffee powder to be stirred while avoiding the water level to rise 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 the phenolic compounds in the coffee which are sensitive to temperature changes, guaranteeing the coffee flavor levels and taste, and avoiding the coffee flavor levels to be chaotic due to large water temperature difference.

[0057] Specifically, when the large water flow and the 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 continuously drives the diffusion of the coffee powder, ensuring that the coffee powder can be uniformly extracted.

[0058] It should be noted that, referring to Figure 4 and Figure 5 , the large holes 608 and the small holes 607 on the rotating disc 604 can be alternately arranged, thereby further improving the stirring efficiency of the coffee powder inside the filter cup 7.

[0059] Referring to Figures 10-11 , the bottom of the blocking plate 615 is rotatably installed with a rotating ring 618, the top ring 621 is installed with a double-sided electromagnetic suction plate 622, the inner part of the top ring 621 is vertically slidably installed with a suction plate 626 and horizontally slidably installed with an insertion block 628, the suction plate 626 and the insertion block 628 are connected through a connecting rod 629, one end of the insertion block 628 is inserted into a vertical groove 625, and the other end of the insertion block 628 is connected with the inner wall of the top ring 621 through a connecting spring 627.

[0060] When the double-sided electromagnetic suction plate 622 is powered on, one end of the double-sided electromagnetic suction plate 622 attracts the rotating ring 618, and the other end of the double-sided electromagnetic suction plate 622 attracts the suction plate 626.

[0061] Specifically, the bracket 9 is respectively installed with a high liquid level sensor 11 and a low liquid level sensor 12.

[0062] It should be noted that, according to personal preference and taste, coffee beans can be roughly ground into fine coffee powder and coarse coffee powder. Since the fine coffee powder has small particle size and small gap between particles, the water flow passes through the coffee powder slowly. In order to avoid the water flow from overflowing from the inside of the filter cup 7.

[0063] The present application detects the highest water level and the lowest water level in the filter cup 7 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, with the operation of the bidirectional motor 601, the rotating blade 603 drives the rotating disc 604 to reverse, at this time only hot water is injected into the filter cup 7 through the small hole 607 on the rotating disc 604 and the ring groove 609 on the base disc 606 to reduce the water inflow of the filter cup 7, at the same time, the bidirectional motor 601 drives the screw rod 614 to rotate synchronously through the transmission rod 602, because the insert block 628 on the top ring 621 cooperates with the vertical groove 625 on the blocking plate 615, the screw rod 614 drives the blocking plate 615 to move towards the liquid inlet 616, with the downward movement of the blocking plate 615, the blocking plate 615 gradually hinders the hot water passing through the liquid inlet 616, thereby reducing the flow rate of the small water flow passing through the small hole 607 and the ring groove 609, and further slowing down the amount of small water flow entering the filter cup 7.

[0064] When the blocking plate 615 approaches the top ring 621, the double-sided electromagnetic suction disc 622 is powered on, one end of the double-sided electromagnetic suction disc 622 adsorbs the rotating ring 618 at the bottom of the blocking plate 615, and the other end of the double-sided electromagnetic suction disc 622 adsorbs the suction plate 626, the suction plate 626 is adsorbed at the same time and pulls the insert block 628 through the connecting rod 629, so that the insert block 628 is separated from the vertical groove 625 on the blocking plate 615, thereby limiting the blocking plate 615, avoiding that the blocking plate 615 blocks the liquid inlet 616 to cause the coffee powder in the filter cup 7 to be interrupted in the extraction process, thereby increasing the water temperature difference in the segmented water injection, and further affecting the taste of the coffee.

[0065] If the double-sided electromagnetic suction disc 622 is not powered on, the blocking plate 615 will drive the double-sided electromagnetic suction disc 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 before extraction, in this state, the blocking time of the liquid inlet 616 is set by the timer 4, that is, the steaming time of the coffee powder, when the timer 4 finishes timing, the timer 4 controls the bidirectional motor 601 to rotate in the positive direction, so that the bidirectional motor 601 drives the blocking plate 615 to move away from the liquid inlet 616 through the screw rod 614, the liquid inlet 616 is opened, and then the extraction is started.

[0066] When the low liquid level sensor 12 detects that the water level in the filter cup 7 reaches the lowest water level, the low liquid level sensor 12 controls the bidirectional motor 601 to rotate in the positive direction.

[0067] Referring to Figures 4-6The distance from the center of the rotating disc 604 to the center of the small hole 607 is a short distance 610, the distance from the center of the rotating disc 604 to the center of the large hole 608 on the rotating disc 604 is a long distance one 611, the distance from the center of the base disc 606 to the center of the large hole 608 on the base disc 606 is a 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.

[0068] It should be noted that, since the long distance one 611 is twice the short distance 610, the long distance one 611 is equal to the long distance two 612, when the rotating disc 604 rotates, the small hole 607 on the rotating disc 604 does not interfere with the large hole 608 on the base disc 606, and when the rotating disc 604 rotates, the small hole 607 cooperates with the ring groove 609, and the large hole 608 in the synchronous groove 605 cooperates with the large hole 608 on the base disc 606.

[0069] Referring to Figures 8-9 , the guide rod 620 is provided with a bottom ring 623, and the bottom ring 623 is connected with the fixed guide sleeve 619 through a reset spring 624.

[0070] It should be noted that the reset spring 624 is used for resetting the top ring 621, when the double-way motor 601 drives the plugging plate 615 to move upward through the screw rod 614, the reset spring 624 rebounds to drive the top ring 621 to reset.

[0071] Referring to Figure 1 , Figure 2 and Figure 12 , the barrel cover 5 is provided with a motor cover 3 sleeved on the double-way motor 601, and the barrel cover 5 is provided with a timer 4, and the timer 4 is connected with the high liquid level sensor 11, the low liquid level sensor 12 and the double-way motor 601 respectively.

[0072] It should be noted that, in use, an appropriate amount of coffee powder is placed in the wet filter cup 7, and then water is injected into the water injection barrel 2, and the water temperature is determined according to the coffee flavor.

[0073] Referring to Figures 1-8 , the present application 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:

[0074] Step S1: an appropriate amount of coffee powder is placed in the wet filter cup 7, and then water is injected into the water injection barrel 2;

[0075] Step S2: during extraction, the double-way motor 601 rotates forward, the double-way 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 conductive state, and as the double-way motor 601 operates, the double-way motor 601 drives the rotating disc 604 to rotate synchronously through the rotating blade 603;

[0076] Step S3: The constant temperature hot water injected into the water injection cylinder 2 inside passes through the rotating disc 604 and the base disc 606 in turn. Since the small holes 607 on the rotating disc 604 match the annular grooves 609 on the base disc 606, the hot water continuously passes through the small holes 607 on the rotating disc 604 and the annular grooves 609 on the base disc 606 to inject a small water flow into the filter cup 7;

[0077] Step S4: As the rotating disc 604 rotates, the large holes 608 in the synchronous groove 605 coincide with the large holes 608 on the base disc 606, and the hot water intermittently passes through the large holes 608 in the synchronous groove 605 and the large holes 608 on the base disc 606 to inject a large water flow into the filter cup 7.

[0078] Referring to Figures 7-12 As a preferred embodiment of the present application, the step S2 specifically comprises the following steps:

[0079] Step S21: During the extraction process, the highest water level and the lowest water level inside 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 inside 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;

[0080] Step S22: The bidirectional motor 601 drives the rotating blade 603 to block the large holes 608 inside the synchronous groove 605 through the transmission rod 602. As the bidirectional motor 601 operates, the rotating blade 603 drives the rotating disc 604 to reverse. At this time, only the hot water passes through the small holes 607 on the rotating disc 604 and the annular grooves 609 on the base disc 606 to inject a small water flow into the filter cup 7;

[0081] Step S23: While the bidirectional motor 601 reverses, the bidirectional motor 601 drives the screw rod 614 to rotate synchronously through the transmission rod 602. Since the insertion block 628 on the top ring 621 matches the vertical groove 625 on the blocking plate 615, the screw rod 614 rotates to drive the blocking plate 615 to move towards the liquid inlet 616. As the blocking plate 615 moves down, the blocking plate 615 gradually hinders the hot water from passing through the liquid inlet 616;

[0082] Step S24: When the blocking plate 615 approaches the top ring 621, the double-sided electromagnetic suction disc 622 is electrified. One end of the double-sided electromagnetic suction disc 622 adsorbs the rotating ring 618 at the bottom of the blocking plate 615, and the other end of the double-sided electromagnetic suction disc 622 adsorbs the suction plate 626. When the suction plate 626 is adsorbed, the insertion block 628 is pulled away from the vertical groove 625 on the blocking plate 615 through the connecting rod 629, so that the insertion block 628 is separated from the vertical groove 625 on the blocking plate 615, thereby limiting the blocking plate 615.

[0083] The implementation principle of the present application is: in use, an appropriate amount of coffee powder is placed in the wet filter cup 7, then water is injected into the water injection cylinder 2, the bidirectional motor 601 is started in forward rotation, the bidirectional motor 601 drives the rotating blade 603 to rotate in the synchronous groove 605 through the transmission rod 602, the rotating blade 603 rotates away from the large hole 608 in the synchronous groove 605, the large hole 608 in the synchronous groove 605 is in a conductive state, and as the bidirectional motor 601 operates, the bidirectional motor 601 drives the rotating disc 604 to rotate synchronously through the rotating blade 603.

[0084] The constant temperature hot water injected into the water injection cylinder 2 passes through the rotating disc 604 and the base disc 606 in turn, and due to the cooperation of the small hole 607 on the rotating disc 604 and the annular groove 609 on the base disc 606, the hot water continuously passes through the small hole 607 on the rotating disc 604 and the annular groove 609 on the base disc 606 to inject a small water flow into the filter cup 7, as the rotating disc 604 rotates, the large hole 608 in the synchronous groove 605 coincides with the large hole 608 on the base disc 606, and the hot water intermittently passes through the large hole 608 in the synchronous groove 605 and the large hole 608 on the base disc 606 to inject a large water flow into the filter cup 7, the intermittent large water flow can ensure that the coffee powder is stirred while avoiding the water level rising rapidly, and ensure full extraction; the continuous small water flow can continuously provide constant temperature hot water for the coffee powder, ensure that the phenolic compounds sensitive to temperature changes in the coffee are stably decomposed, ensure the coffee flavor levels and taste, and avoid the coffee flavor levels being chaotic due to large water temperature difference;

[0085] Specifically, when the large water flow and the small water flow are injected into the coffee powder in 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 in the filter cup 7, and after the large water flow stops, the small water flow continuously drives the diffusion of the coffee powder, ensuring that the coffee powder can be uniformly extracted.

[0086] In the extraction process, the highest water level and the lowest water level inside 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 inside 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 leaf 603 to block the large hole 608 inside the synchronous groove 605 through the transmission rod 602. With the operation of the bidirectional motor 601, the rotating leaf 603 drives the rotating disc 604 to reverse. At this time, only hot water is injected into the filter cup 7 through the small hole 607 on the rotating disc 604 and the ring groove 609 on the base disc 606 to reduce the water inflow of the filter cup 7. At the same time, the bidirectional motor 601 drives the screw rod 614 to rotate synchronously through the transmission rod 602. Since the insert block 628 on the top ring 621 cooperates with the vertical groove 625 on the blocking plate 615, the screw rod 614 drives the blocking plate 615 to move towards the liquid inlet 616. With the downward movement of the blocking plate 615, the blocking plate 615 gradually hinders the hot water from passing through the liquid inlet 616, reduces the flow rate of the small water flow passing through the small hole 607 and the ring groove 609, and further slows down the amount of small water flow entering the filter cup 7, avoiding water overflow from the inside of the filter cup 7.

[0087] When the blocking plate 615 approaches the top ring 621, the double-sided electromagnetic suction disc 622 is powered on. One end of the double-sided electromagnetic suction disc 622 adsorbs the rotating ring 618 at the bottom of the blocking plate 615, and the other end of the double-sided electromagnetic suction disc 622 adsorbs the suction plate 626. The suction plate 626 is adsorbed while pulling the insert block 628 through the connecting rod 629, so that the insert block 628 is separated from the vertical groove 625 on the blocking plate 615, realizing the limiting of the blocking plate 615, avoiding the blocking plate 615 blocking the liquid inlet 616, causing the coffee powder inside the filter cup 7 to be interrupted during the extraction process, increasing the water temperature difference during segmented water injection, and further affecting the taste of coffee.

[0088] In addition, if the double-sided electromagnetic suction disc 622 is not powered on, the blocking plate 615 will drive the double-sided electromagnetic suction disc 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 before extraction. In this state, the blocking time of the liquid inlet 616, i.e. the steaming time of the coffee powder, is set through the timer 4. When the timer 4 finishes counting, the timer 4 controls the bidirectional motor 601 to rotate forward, so that the bidirectional motor 601 drives the blocking plate 615 to move away from the liquid inlet 616 through the screw rod 614. The liquid inlet 616 is opened, and then the extraction is started.

[0089] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A coffee extraction device, characterized in that: Includes 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 inside 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 turntable (604) is rotatably installed on the base plate (606). A synchronization groove (605) is symmetrically opened on the turntable (604). The rotating blade (603) is installed inside the turntable (604). A small hole (607) is opened on the turntable (604). Large holes (608) are opened inside the synchronization groove (605) and on the base plate (606). An annular groove (609) is opened between the large holes (608) on the base plate (606). When the bidirectional motor (601) drives the turntable (604) to rotate through the rotating blade (603), the large hole (608) inside the synchronous groove (605) engages with the large hole (608) on the base plate (606), and the small hole (607) engages with the annular groove (609).

2. The coffee extraction apparatus according to claim 1, characterized in that: The 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) and the long distance two (612) are equal.

3. The coffee extraction apparatus according to claim 1, characterized in that: The water injection cylinder (2) is fixedly installed with a funnel (613), and a liquid inlet (616) is opened at the bottom of the funnel (613). A fixed guide sleeve (619) is installed on the liquid inlet (616), and a guide rod (620) is slidably installed inside the fixed guide sleeve (619). 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 (614), the screw (614) is connected to the sealing plate (615) through transmission, the sealing plate (615) has a vertical groove (625) and the top ring (621) slides with the vertical groove (625) through the insert (628).

4. The coffee extraction apparatus according to claim 3, characterized in that: 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).

5. The coffee extraction apparatus according to claim 4, characterized in that: The sealing plate (615) has a rotating ring (618) mounted on its bottom, and a double-sided electromagnetic chuck (622) mounted on its top ring (621). Inside the top ring (621), a suction plate (626) is vertically slidably mounted and an insert (628) is horizontally slidably mounted. The suction plate (626) and the insert (628) are connected by a connecting rod (629). One end of the insert (628) is inserted into the vertical groove (625), and the other end of the insert (628) is connected to the inner wall of the top ring (621) by a connecting spring (627). When the double-sided electromagnetic chuck (622) is powered on, one end of the double-sided electromagnetic chuck (622) attracts the rotating ring (618), and the other end of the double-sided electromagnetic chuck (622) attracts the suction plate (626).

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

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

8. A coffee extraction method, characterized in that, The method is applied to a coffee extraction apparatus as described in any one of claims 1-7 above, and the method includes the following steps: Step S1: Take an appropriate amount of coffee powder and put it into the moistened filter cup (7), then pour water into the water inlet (2); Step S2: During extraction, the bidirectional motor (601) rotates forward. The bidirectional motor (601) drives the rotating blade (603) to rotate in the synchronization groove (605) through the transmission rod (602). This makes the large hole (608) in the synchronization groove (605) open. As the bidirectional motor (601) runs, the bidirectional motor (601) drives the turntable (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 turntable (604) and the base plate (606) in sequence. Since the small hole (607) on the turntable (604) and the annular groove (609) on the base plate (606) cooperate, the hot water continuously injects a small flow of water into the filter cup (7) through the small hole (607) on the turntable (604) and the annular groove (609) on the base plate (606); Step S4: As the turntable (604) rotates, the large hole (608) in the synchronization tank (605) coincides with the large hole (608) on the base plate (606), and hot water intermittently injects a large flow of water into the filter cup (7) through the large hole (608) in the synchronization tank (605) and the large hole (608) on the base plate (606).

9. A coffee extraction method according to claim 8, characterized in that, Step S2 specifically includes the following steps: Step S21: During the extraction process, the highest and lowest water levels inside the filter cup (7) are detected by the high liquid level sensor (11) and the low liquid level sensor (12) respectively. When the water level inside 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 synchronous groove (605) through the transmission rod (602). As the bidirectional motor (601) runs, the rotating blade (603) drives the turntable (604) to reverse. At this time, only hot water is 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). Step S23: While the bidirectional motor (601) reverses, the bidirectional motor (601) drives the screw (614) to rotate synchronously through the transmission rod (602). Since the insert (628) on the top ring (621) cooperates with the vertical groove (625) on the sealing plate (615), the rotation of the screw (614) drives the sealing plate (615) to move closer to the liquid inlet (616). As the sealing plate (615) moves down, the sealing plate (615) gradually obstructs the hot water from passing through the liquid inlet (616). Step S24: When the sealing plate (615) approaches the top ring (621), the double-sided electromagnetic chuck (622) is energized. One end of the double-sided electromagnetic chuck (622) adsorbs the rotating ring (618) at the bottom of the sealing plate (615), and the other end of the double-sided electromagnetic chuck (622) adsorbs the suction plate (626). At the same time that the suction plate (626) is adsorbed, the connecting rod (629) pulls the insert (628) to make the insert (628) disengage from the vertical groove (625) on the sealing plate (615), thereby limiting the sealing plate (615).

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