CN117356903A - Coffee extraction device, coffee extraction working method and coffee machine - Google Patents

Abstract

The invention relates to the technical field of coffee extraction, and provides a coffee extraction device which comprises an extraction cylinder, wherein the extraction cylinder is provided with an extraction cavity, the extraction cavity is provided with an inlet and an outlet, a first pressing plug is movably arranged and passes through the inlet and the outlet after moving so as to enter or move out of the extraction cavity, a second pressing plug is slidably arranged in the extraction cavity, and coffee powder is pressed between the first pressing plug and the second pressing plug. A coffee machine and a coffee extraction method are also provided. By the technical scheme, the technical problem that the coffee machine in the related art is poor in structural compactness is solved.

Description

A coffee extraction device and coffee extraction working method and its coffee machine

Technical field

The present invention relates to the technical field of coffee extraction. Specifically, it relates to a coffee extraction device, a coffee extraction working method and a coffee machine.

Background technique

After coffee powder is mixed with water, the coffee components are transferred to the water. This process of extracting coffee components is called extraction. There are four commonly used extraction methods, namely drip, immersion, siphon, and coffee machine. Among them, the coffee machine type uses a coffee machine for extraction and is becoming more and more popular. It has a wider impact and is simpler to operate than the filter paper drip type. It is indeed easier to leave the coffee brewing work to the machine. However, the coffee brewed by the machine has less stable taste and is not as easy to control as manual brewing, so the selection of raw materials is even more important. The principle of an espresso machine is to put finely ground coffee powder into a container, and then use high temperature and high pressure to extract a highly concentrated coffee liquid in a short period of time. High temperature and high pressure are the key points of extraction, so in order to meet Under this condition, the coffee machine has a certain complex structure. The principle of the American espresso machine is to use hot water to drip onto the coffee powder to extract the coffee. Compared with the Italian coffee machine, it does not require high pressure, but it also requires certain complex action mechanisms, driving mechanisms, slag discharge mechanisms, etc. However, no matter it is Both American coffee machines and Italian coffee machines have the problem of poor overall compactness. In order to pour coffee powder and remove coffee grounds, the extraction cylinder usually needs to be oscillated, which further increases the complexity and complexity of the equipment. size of space.

Contents of the invention

The invention proposes a coffee extraction device, a coffee extraction working method and a coffee machine, thereby solving the technical problem of poor compactness of the coffee machine in the related art.

The technical solution of the present invention is as follows:

A coffee extraction device including:

Extraction cylinder, the extraction cylinder has an extraction chamber, the extraction chamber has an inlet and outlet,

a first pressure plug, the first pressure plug is movable and moves through the inlet and outlet to enter or move out of the extraction chamber,

A second pressure plug is slidably disposed in the extraction chamber, and the space between the first pressure plug and the second pressure plug is used to compress coffee powder.

As a further technical solution, the first pressure plug has a liquid outlet channel, the liquid outlet channel has a liquid outlet inlet and a liquid outlet, and the liquid outlet inlet is connected with the extraction chamber,

The second pressure plug has a liquid inlet channel, the liquid inlet channel has a liquid inlet and a liquid inlet outlet, and the liquid inlet outlet leads to the extraction chamber.

As further technical solutions, it also includes:

a liquid collecting part, which is arranged on the first pressing plug and forms a liquid collecting chamber between the first pressing plug and the liquid collecting part; the liquid collecting part also has a plurality of liquid collecting through holes; the extraction chamber It is connected with the liquid collecting through hole, the liquid collecting through hole is connected with the liquid collecting cavity, and the liquid collecting cavity is connected with the liquid outlet channel,

The liquid dispensing member is arranged on the second pressure plug and forms a liquid dispensing chamber between the liquid dispensing member and the second pressure plug. The liquid dispensing member also has a plurality of liquid dispensing through holes. The liquid inlet The outlet is connected to the liquid separation chamber, the liquid separation chamber is connected to the liquid separation through hole, and the liquid separation through hole leads to the extraction chamber.

As further technical solutions, it also includes:

Separating protrusions, several of the separating protrusions are provided in the liquid collection chamber and the liquid separation chamber, the liquid collection chamber and the liquid separation chamber also have annular guide grooves, the liquid outlet and The liquid inlet and outlet are located in the annular guide groove, and the separation protrusion has a supporting surface, and the supporting surface faces the liquid collecting part and the liquid distributing part,

An annular sealing member is provided on both the first pressure plug and the second pressure plug, and the annular sealing member is in contact with the extraction barrel.

As a further technical solution, a linear drive component is also included, and the linear drive component drives the second pressing plug to move, including:

first rotating drive member,

Screw, the first rotational driving member drives the screw to rotate,

Screw nut, the screw nut is threadedly connected to the screw rod,

A sliding part, the nut is arranged on the sliding part, and the second pressing plug is arranged on the sliding part.

As a further technical solution, the sliding member has a guide hole, and the linear drive assembly further includes a guide member located in the guide hole.

As a further technical solution, a second driving assembly and a frame are also included. The second driving assembly drives the first pressing plug to move and enter and move out of the extraction chamber, including:

A rotating member, the rotating member is rotatably arranged on the frame, and the shaft portion of the rotating member has a first guide portion,

The first swing member is swingably arranged on the rotating member. The frame body has a first guide groove and a second guide groove. The first guide groove includes interconnected arc sections and vertical sections. To the section, the second guide groove is arc-shaped, the first swing member has a third guide part, and the third guide part is slidably arranged in the second guide groove,

The second swing member has a second guide part and a third guide groove, the second guide part is slidably disposed in the first guide groove, and the first guide part slides in the third guide groove. In the three guide grooves, the first pressing plug is arranged on the second swing member. After the rotation of the rotating member, the second swing member first rotates along the arc segment and then along the vertical direction. segment decline.

As a further technical solution, the second driving component further includes

A toggle plate, the toggle plate is arranged on the rotating member, the toggle plate has an arc-shaped toggle portion, the first swing member has a toggled portion, the toggle plate follows the rotation After the member is rotated, the arc-shaped turning part contacts the toggled part, causing the first swinging member to swing.

As a further technical solution, the second driving component further includes

second rotational drive member,

Idle gear, the second rotation driving member drives the idle gear, and the idle gear drives the rotation member to rotate.

As a further technical solution, there are two rotating parts, the first swinging part, the second swinging part and the toggle plate, and they are symmetrically arranged on both sides of the frame body. A transmission shaft is provided on the upper body, and transmission gears are respectively provided at both ends of the transmission shaft. The transmission gears drive the rotating member to rotate.

As further technical solutions, it also includes

The slag pushing member is slidably disposed on the extraction barrel and is located above the inlet and outlet. The slag pushing member has a vertical guide groove, the second swinging member has a fourth guide part, and the The fourth guide part is slidably disposed in the vertical guide groove.

As a further technical solution, the slag pusher has an arc-shaped push notch or a cylindrical push receiving cavity, and the bottom of the cylindrical push receiving cavity has a slag inlet.

As a further technical solution, the frame body has:

accommodating space, the first pressure plug is accommodated by the accommodating space before moving to the extraction chamber,

A waste material trough, the waste material trough and the accommodating space are located on both sides of the extraction tube respectively. One end of the waste material trough close to the extraction tube has a sloped portion, and the other end of the waste material trough has a bent portion.

As a further technical solution, a pressure-maintaining component is also included, and the pressure-maintaining component is arranged in the liquid outlet channel, including

An annular edge, the annular edge is arranged in the liquid outlet channel, the annular edge has a through hole,

The blocking member is slidably disposed in the liquid outlet channel, and blocks the through hole or cancels blocking the through hole after sliding,

An elastic member acts on the blocking member to provide the blocking member with a force to block the through hole.

As a further technical solution, the pressure maintaining component also includes:

Adjustment bolt, the adjustment bolt extends into the liquid outlet channel, one end of the elastic member is in contact with the adjustment bolt, and the other end is in contact with the elastic member.

As a further technical solution, the stopper is spherical, the annular edge has an annular spherical support portion, and the stopper is in contact with the spherical support portion.

The invention also proposes a coffee machine, which includes the coffee extraction device and a liquid outlet component. The liquid outlet assembly is connected with the liquid outlet, and includes

Inner tube, the inner tube is connected with the liquid outlet, and the wall of the inner tube has a first through hole,

The outer tube is arranged outside the inner tube and forms an annular cavity with the inner tube. The wall of the outer tube has a second through hole. One end of the second through hole is connected to the annular cavity. The cavity is connected, and the other end is connected to the atmosphere.

An annular sleeve is placed outside the inner tube and blocks the first through hole. After the annular sleeve is acted upon by the coffee liquid flowing through the first through hole, the outer diameter of the annular sleeve increases and the first through hole is blocked. The second through hole is blocked.

As a further technical solution, the lower end of the inner tube is higher than the lower end of the outer tube and lower than the second through hole.

As a further technical solution, the outer tube has a reduced diameter section, and the reduced diameter section is located below the inner tube.

As a further technical solution, the outer tube is threadedly connected to the liquid outlet, the upper end of the annular cavity is closed, and the lower end leads to the reduced diameter section.

As a further technical solution, the liquid outlet assembly further includes a liquid outlet hose, and the liquid outlet hose is connected to the outer tube.

As a further technical solution, the outer wall of the inner tube also has a tapered convex edge, and the upper end of the annular sleeve is stuck on the tapered convex edge.

As a further technical solution, the upper end of the inner tube is provided with an annular seal, and the annular seal is in contact with the inner wall of the outer tube and the outer wall of the inner tube.

The invention also proposes a coffee extraction working method, using the coffee extraction device to perform coffee extraction.

The working principle and beneficial effects of the present invention are:

In the present invention, the coffee extraction device mainly consists of an extraction cylinder, a first pressure plug and a second pressure plug. The extraction cylinder has an extraction chamber for coffee extraction. The extraction chamber has a means for supplying coffee powder and the first pressure plug into and out of the extraction chamber. Inlet and outlet, the second pressure plug can move up and down in the extraction chamber and slide, and is always located in the extraction chamber. The second pressure plug always serves as the bottom of the extraction chamber. When performing coffee extraction, the first stopper is initially located outside the inlet and outlet. The coffee powder is first poured into the extraction cylinder. Then the first stopper is driven by the driving mechanism connected to it from the inlet and outlet into the extraction chamber. The driving mechanism can be The linear drive or swing drive mechanism allows the first stopper to enter the extraction chamber and drive it downward. The first stopper moves downward in the extraction chamber and compacts the coffee powder. Then, hot water is introduced into the extraction chamber. It can provide high pressure for coffee extraction. After coffee extraction is completed, the first pressure plug removes the extraction chamber, and the second pressure plug moves upward to drive the coffee grounds to move upward. Finally, the coffee grounds are discharged from the extraction chamber from the inlet and outlet, thus completing the coffee extraction. The overall structure is simple and compact. The extraction barrel does not need to be moved, and the second pressure plug only needs to move up and down. The first pressure plug only needs to enter and move in the extraction chamber. This can be achieved by using less space. The feeding, pressing, extraction, and residue removal required for coffee extraction achieve efficient use of space.

Description of the drawings

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a schematic structural diagram of another perspective of the present invention;

Figure 3 is a schematic structural diagram of the A-A section in Figure 2;

Figure 4 is a schematic side view of the structure of the present invention;

Figure 5 is another side structural schematic diagram of the present invention;

Figure 6 is a schematic diagram of the internal structure of the present invention;

Figure 7 is a schematic structural diagram of the toggle plate in the present invention;

Figure 8 is a schematic diagram of the first pressure plug structure in the present invention;

Figure 9 is a schematic structural diagram of the C-C section in Figure 8;

Figure 10 is a schematic structural diagram of the liquid outlet component of the present invention;

Figure 11 is a schematic structural diagram of the A-A section in Figure 10;

Figure 12 is a schematic diagram of the cylindrical pushing material receiving cavity of the slag pushing member in the present invention;

In the picture: extraction cylinder-101, extraction chamber-102, inlet and outlet-103, first pressure plug-104, liquid outlet channel-105, liquid inlet-106, liquid outlet-107, second pressure plug-108, Liquid inlet channel-109, liquid inlet-110, liquid inlet outlet-111, liquid collecting part-112, liquid collecting chamber-113, liquid collecting through hole-114, liquid dispensing part-115, liquid dispensing chamber-116, dispensing Liquid through hole-117, separation protrusion-118, supporting surface-119, annular seal-120, linear drive assembly-121, first rotary drive part-122, screw rod-123, nut-124, sliding part- 125, guide hole-126, second drive component-127, frame-128, rotating part-129, first guide part-130, first swing part-131, first guide groove-132, second guide groove- 133, arc section-134, vertical section-135, third guide part-136, second swing member-137, second guide part-138, third guide groove-139, toggle plate-140, arc shape Toggle part-141, Toggled part-142, second rotational driving part-143, idle gear-144, transmission shaft-145, transmission gear-146, slag pusher-147, vertical guide groove-148, fourth Guide part-149, arc-shaped pushing gap-150, accommodation space-151, waste chute-152, inclined part-153, bending part-154, guide part-155, cylindrical pushing material receiving cavity-156, slag material Inlet-157, liquid outlet assembly-201, inner pipe-202, outer pipe-203, ring kit-204, reduced diameter section-205, liquid outlet hose-206, tapered convex edge-207, first through hole- 208, second through hole-209, annular cavity-210, annular seal-211, pressure maintaining component-301, annular edge-302, through hole-303, stopper-304, elastic member-305, adjusting bolt-306 , spherical support part-307.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

As shown in Figures 1 to 12, this embodiment proposes a coffee extraction device, including an extraction cylinder 101, the extraction cylinder 101 has an extraction chamber 102, the extraction chamber 102 has an inlet and outlet 103, the first pressure plug 104 is movable, and After moving through the inlet and outlet 103 to enter or move out of the extraction chamber 102, the second pressure plug 108 is slidably disposed in the extraction chamber 102, and the space between the first pressure plug 104 and the second pressure plug 108 is used to compress the coffee powder.

In this embodiment, the coffee extraction device mainly consists of an extraction cylinder 101, a first pressure plug 104 and a second pressure plug 108. The extraction cylinder 101 has an extraction chamber 102 for coffee extraction. The extraction chamber 102 has a function to provide coffee powder and a third pressure plug. A pressure plug 104 enters and exits the inlet and outlet 103 of the extraction chamber 102. A second pressure plug 108 can move up and down in the extraction chamber 102 and is always located in the extraction chamber 102. The second pressure plug 108 always serves as the bottom of the extraction chamber 102. When performing coffee extraction, the first pressure plug 104 is initially located outside the inlet and outlet 103. The coffee powder is first poured into the extraction cylinder 101, and then the first pressure plug 104 is driven by the driving mechanism connected thereto from the inlet and outlet 103 to the extraction chamber. cavity 102, the driving mechanism can be a linear drive or a swing drive mechanism so that the first pressing plug 104 can enter the extraction chamber 102 and drive it downward. The first pressing plug 104 moves downward in the extraction chamber 102 and presses the coffee powder. Afterwards, hot water is introduced into the extraction chamber 102 to provide high pressure for coffee extraction. After the coffee extraction is completed, the first pressure plug 104 moves out of the extraction chamber 102, and the second pressure plug 108 moves upward to drive the coffee grounds to move upward, and finally the coffee grounds are moved upward. The coffee grounds are discharged from the extraction chamber 102 from the inlet and outlet 103, thereby completing coffee extraction. The overall structure is simple and compact. The extraction cylinder 101 does not need to move, and the second plug 108 only needs to move up and down. The first plug 104 only needs to enter and move in the extraction chamber 102, so less space can be used. With its simple structure, it can realize the feeding, pressing, extraction and slag discharge required for coffee extraction, achieving efficient use of space.

Further, as shown in Figure 3, the first pressure plug 104 has a liquid outlet channel 105, the liquid outlet channel 105 has a liquid outlet 106 and a liquid outlet 107, the liquid outlet 106 is connected to the extraction chamber 102, and the second pressure plug 108 has The liquid inlet channel 109 has a liquid inlet 110 and a liquid inlet outlet 111, and the liquid inlet outlet 111 leads to the extraction chamber 102.

In this embodiment, in order to meet the demand for sufficient extraction of coffee, a liquid outlet channel 105 is provided on the second pressure plug 108. The hot water flows from the liquid inlet 110 of the liquid inlet channel 109 to the liquid inlet outlet 111, and finally flows into the liquid inlet. In order to facilitate the flow out of the finished coffee liquid after the extraction is completed, the extraction chamber 102 connected with the outlet 111 is provided with a liquid outlet channel 105 on the first pressure plug 104, and the finished coffee liquid flows from the liquid outlet inlet 106 to the liquid outlet 107.

When making coffee, the type of finished coffee mainly depends on the production method and brewing pressure. Generally speaking, espresso coffee is usually espresso, which is made with an espresso machine. It requires less water and has a strong and pure taste. , mellow. Americano coffee is made from black coffee made using a drip coffee pot, or by adding a certain proportion of water to espresso coffee, and has a relatively light taste. In this embodiment, the factors that determine the concentration of the coffee liquid include the extraction pressure of the coffee powder in the extraction cylinder 101, the extraction temperature, and the flow and pressure of water. The flow and pressure of the water are determined by a variety of factors, and are related to the time of coffee extraction. The compressed shape and volume of the coffee powder cake are related. For example, if the coffee powder is contained in the cylindrical extraction cylinder 101, it is related to the diameter and thickness of the coffee powder, and also related to the density of the coffee powder after being pressed. In this embodiment, the design The extraction cylinder 101 is used to extract coffee powder. By changing the diameter of the extraction cylinder 101, the diameter of the coffee powder cake can be affected; there are first pressure plugs 104 and second pressure plugs 108 on the upper and lower sides of the extraction cylinder 101. By changing the first pressure plug 104 and the stroke of the second pressing plug 108 can change the distance between the first pressing plug 104 and the second pressing plug 108 that finally presses the coffee powder cake, thereby changing the thickness and density of the coffee powder cake.

When making coffee, the second stopper 108 seals the lower end of the extraction tube 101 in the extraction tube 101, and the first stopper 104 is located outside the inlet and outlet 103 of the extraction tube 101, and sends the coffee powder into the extraction chamber 102 from the inlet and outlet 103. Afterwards, the second pressure plug 108 rises, the first pressure plug 104 enters the extraction port, and the coffee powder forms an extraction layer in the extraction chamber 102 under the pressing action of the second pressure plug 108 and the first pressure plug 104. After the plug 108 and the first pressure plug 104 are in place, hot water enters the extraction chamber 102 from the liquid inlet channel 109 to start coffee extraction; after the coffee is made, the first pressure plug 104 moves out of the extraction chamber 102, and the second pressure plug 108 slides upward. Go to the inlet and outlet 103, and push the coffee grounds from the inlet and outlet 103 to the outside of the extraction chamber 102 to facilitate cleaning of the remaining residues in the coffee machine. Compared with the existing coffee machine, the coffee extraction device of this embodiment realizes that one coffee machine can satisfy both Italian coffee and Americano coffee at the same time.

Further, as shown in FIG. 3 , a liquid collecting part 112 is also included. The liquid collecting part 112 is arranged on the first pressing plug 104 and forms a liquid collecting chamber 113 between the first pressing plug 104 and the liquid collecting part 112 also has a plurality of collecting chambers 113 . The liquid through hole 114 is connected to the extraction chamber 102 and the liquid collecting through hole 114. The liquid collecting through hole 114 is connected to the liquid collecting chamber 113. The liquid collecting chamber 113 is connected to the liquid outlet channel 105. The liquid dispensing member 115 is arranged on the second pressure plug 108. The liquid dispensing chamber 116 is formed between the liquid dispensing member 115 and the second pressure plug 108. The liquid dispensing member 115 also has a plurality of liquid dispensing through holes 117. The liquid inlet outlet 111 is connected with the liquid dispensing chamber 116. The liquid dispensing chamber 116 is connected with the liquid dispensing through holes 117. Communicated, the liquid separation through hole 117 leads to the extraction chamber 102 .

In this embodiment, in order to ensure that the coffee powder is fully extracted, it is avoided that the hot water directly enters the extraction chamber 102 from the liquid inlet 110 and the coffee powder at the liquid inlet 110 is wetted with water and moves around to form a lump, causing the coffee powder to be extracted. Insufficient, a liquid dispensing member 115 is provided on the second pressure plug 108. A liquid dispensing chamber 116 is formed between the liquid dispensing member 115 and the second pressure plug 108. Hot water flows into the liquid dispensing chamber 116 from the liquid inlet outlet 111, and the liquid dispensing chamber 116 is formed. After the chamber 116 is filled, hot water enters the extraction chamber 102 through the liquid separation through hole 117 on the liquid separation member 115 .

When the coffee flows into the liquid outlet channel 105, the second pressure plug 108 rises, and the remaining residue after the coffee powder extraction will also rise to the liquid outlet 106, causing the liquid outlet 106 to be blocked, and some coffee cannot flow out, causing waste. , in order to prevent residue from clogging the liquid outlet 106, a liquid collection part 112 is provided on the first pressure plug 104. A liquid collection chamber 113 is formed between the liquid collection part 112 and the first pressure plug 104. Coffee passes through the liquid collection part from the extraction chamber 102. The first channel on 112 enters the liquid collecting chamber 113. The coffee liquid is filled with the liquid collecting cavity 113 and then flows into the liquid outlet channel 105. When the coffee liquid is discharged, the liquid collecting part 112 is parallel to the liquid dispensing part 115 and gradually approaches. When the coffee liquid is discharged, When completed, the residue is between the liquid collecting part 112 and the liquid dispensing part 115 and is compressed by the liquid collecting part 112 and the liquid dispensing part 115, which reduces the waste caused by the coffee liquid residue in the residue and solves the problem of clogging the liquid outlet 106 by the coffee residue. The problem.

Further, as shown in Figure 3, it also includes separation protrusions 118. Several separation protrusions 118 are provided in the liquid collection chamber 113 and the liquid separation chamber 116. The liquid collection chamber 113 and the liquid separation chamber 116 also have annular guide groove labels. , the liquid outlet 106 and the liquid inlet 111 are both located in the annular guide groove, the separation protrusion 118 has a support surface 119, the support surface 119 faces the liquid collecting part 112 and the liquid distributing part 115, the annular seal 120, the first pressure plug 104 An annular seal 120 is provided on the second pressure plug 108 and the annular seal 120 is in contact with the extraction cylinder 101 .

In this embodiment, if the liquid collecting part 112 and the liquid dispensing part 115 are directly contacted with the first pressing plug 104 and the second pressing plug 108, the liquid collecting chamber 113 and the liquid dispensing chamber 116 will not be able to form or reduce the size of the cavity. space, in order to ensure that the cavity space of the liquid collecting chamber 113 and the liquid dispensing chamber 116 meets the needs of coffee extraction, several separation protrusions 118 are provided in the liquid collection chamber 113 and the liquid dispensing chamber 116, and the supporting surfaces 119 of the separation protrusions 118 Toward the liquid collecting part 112 and the liquid dispensing part 115, in order to ensure that the liquid collecting chamber 113 and the liquid dispensing chamber 116 are connected with the liquid outlet 106 and the liquid inlet 111, the liquid collecting part 112 and the liquid dispensing part 115 also have an annular guide groove, and the liquid outlet The inlet 106 and the liquid inlet outlet 111 are both located in the annular guide groove. In order to ensure that the coffee liquid does not flow out from the connection between the first pressure plug 104 and the second pressure plug 108 and the extraction barrel 101, the first pressure plug 104 and the second pressure plug 104 are connected to the extraction barrel 101. An annular seal 120 is provided on the pressure plug 108 to ensure the sealing performance of the coffee machine and avoid waste caused by poor sealing of the coffee machine.

Further, as shown in FIG. 3 , it also includes a linear drive assembly 121 , which drives the second pressing plug 108 to move, and includes a first rotational driving member 122 , which drives the screw rod 123 to rotate, and the screw nut 124 It is threaded on the screw rod 123, the nut 124 is provided on the sliding member 125, and the second pressing plug 108 is provided on the sliding member 125.

In this embodiment, the second pressing plug 108 is driven by a linear driving member. The linear driving member includes a first rotating driving member 122, a screw rod 123, a screw nut 124 and a sliding member 125. The first rotating driving member 122 and the driving screw rod 123 Rotate, the screw rotates to drive the screw nut 124 threadedly connected to the screw rod 123 to move up and down. The screw nut 124 is installed on the sliding part 125. When the screw nut 124 moves, the sliding part 125 moves with the screw nut 124. The lifting structure is simple and not easy. damage, and is very suitable for driving the second pressing plug 108 over a longer distance, and can also ensure compact structure.

Further, as shown in FIG. 3 , the sliding member 125 has a guide hole 126 , and the linear drive assembly 121 further includes a guide member 155 located in the guide hole 126 .

In this embodiment, as shown in Figure 3, the sliding member 125 has a guide hole 126, and the linear driving member also has a guide member 155. The guide member 155 is provided in the guide hole 126 to limit the movement direction of the sliding member 125 and prevent the sliding member from moving. 125 appears to move unconstrained to reduce the damage rate of the coffee machine.

Further, as shown in Figures 4 to 6, it also includes a second driving assembly 127 and a frame 128. The second driving assembly 127 drives the first pressing plug 104 to move into and out of the extraction chamber 102, including:

The rotating member 129 is rotatably mounted on the frame 128. The shaft of the rotating member 129 has a first guide portion 130.

The first swinging member 131 is swingably arranged on the rotating member 129. The frame 128 has a first guide groove 132 and a second guide groove 133. The first guide groove 132 includes interconnected arc sections 134 and vertical sections. Towards section 135, the second guide groove 133 is arc-shaped, the first swing member 131 has a third guide part 136, and the third guide part 136 is slidably disposed in the second guide groove 133.

The second swinging member 137 has a second guide portion 138 and a third guide groove 139. The second guide portion 138 is slidably disposed in the first guide groove 132, and the first guide portion 130 is slidably disposed in the third guide groove. 139, the first pressing plug 104 is set on the second swing member 137. After the rotating member 129 rotates, the second swing member 137 first rotates along the arc section 134 and then descends along the vertical section 135.

In this embodiment, the movement path of the first pressing plug 104 is to rotate and then descend into the extraction barrel 101. In order to ensure that the first pressing plug 104 smoothly enters or moves out of the extraction chamber 102, a second driving assembly 127 and a frame are also provided. 128. The frame 128 has a first guide groove 132. The second drive assembly 127 includes a rotating member 129, a first swinging member 131 and a second swinging member 137. The shaft of the rotating member 129 has a first guide portion 130, and the second swinging member 129 has a first guide portion 130. The member 137 has a second guide portion 138 and a second guide groove 133. When the first pressing plug 104 enters the extraction chamber 102, the rotating member 129 rotates, and the first swing member 131 provided on the rotating member 129 rotates with the rotating member 129. When swinging, the second swinging member 137 swings with the first swinging member 131 under the action of the second guide part 138. When the second guide part 138 reaches the junction of the arc section 134 and the vertical section 135 of the first guide groove 132 Finally, under the action of the second guide part 138 and the third guide part 136, the first swing part 131 swings relative to the rotating part 129, and the second swing part 137 follows the swing of the first swing part 131 and is restricted by the first guide part 130 Descending along the third guide groove 139, the descending speed of the second swinging member 137 is controlled by the rotational speed of the rotating member 129. The rotating structure is simple and the maintenance is convenient.

Further, as shown in Figures 6 to 7, the second driving assembly 127 also includes a toggle plate 140, which is provided on the rotating member 129. The toggle plate 140 has an arc-shaped toggle portion 141, and the first swing member 131 has a toggled part 142. After the toggled plate 140 rotates with the rotating member 129, the arc-shaped toggled part 141 contacts the toggled part 142, causing the first swinging member 131 to swing.

In this embodiment, in order to change the movement direction of the second guide part 138, a dial plate 140 is provided on the rotating member 129. When the second swing member 137 changes the movement direction, the arc-shaped dial part 141 is generated under the action of inertia. A force of The force generated by the moving part 141 under the action of inertia acts on the second guide part 138, and the pushed part 143 is moved to give the second swing member 137 a swinging force to ensure that the second guide part 138 does not interact with the second guide part 138 when changing the direction of movement. An impact occurs on one guide groove 132, which prolongs the service life of the second guide part 138.

Further, as shown in FIGS. 4 to 6 , the second driving assembly 127 also includes a second rotational driving member 143 . The second rotational driving member 143 drives the idle gear 144 , and the idler gear 144 drives the rotating member 129 to rotate.

In this embodiment, the second driving assembly 127 also includes a second rotating driving member 143 and an idle gear 144. The second rotating driving member 143 drives the idle gear 144, and the idle gear 144 drives the rotating member 129 to rotate. The power structure is simple and easy to maintain.

Furthermore, there are two rotating parts 129, the first swinging part 131, the second swinging part 137 and the dialing plate 140, and they are symmetrically arranged on both sides of the frame body 128. The frame body 128 is provided with a transmission shaft 145. The transmission shaft 145 Transmission gears 146 are respectively provided at both ends, and the transmission gears 146 drive the rotating member 129 to rotate.

In this embodiment, in order to prevent the first pressing plug 104 from deflecting sideways during the sliding process, the radial force experienced by the second swinging member 137 during the swinging process is reduced, the service life of the second swinging member 137 is extended, and the coffee machine Failure rate, transmission shafts 145 are provided on both sides of the frame 128, and transmission gears 146 are provided at both ends of the transmission shaft 145. The transmission gears 146 on the transmission shaft are driven by the idle gear 144, and the transmission gears 146 are driven symmetrically on the frame. The rotating parts 129 on both sides of the frame 128 rotate, and the second swinging parts 137 on both sides of the frame 128 rotate simultaneously, which reduces the probability of the first pressing plug 104 lateral deflection during the sliding process. Compared with the single-sided transmission of the prior art, structure, the second swinging members 137 are arranged on both sides to achieve a more balanced pressing of the pressing plug. This transmission structure realizes the flipping and pressing action of the first pressing plug 104 by rotating the driving member 143, and also reduces the operating time of the coffee machine. failure rate.

Further, as shown in Figures 4 to 6, it also includes a slag pushing piece 147. The slag pushing piece 147 is slidably disposed on the extraction cylinder 101 and is located above the inlet and outlet 103. The slag pushing piece 147 has a vertical guide groove 148, and the second swing The member 137 has a fourth guide portion 149, which is slidably disposed in the vertical guide groove 148.

In this embodiment, in order to facilitate the removal of waste residue after coffee extraction, a residue pusher 147 is also designed. The residue pusher 147 is slidably disposed on the extraction cylinder 101 and is located above the inlet and outlet 103. The residue pusher 147 has a vertical guide groove 148. , the second swinging member 137 has a fourth guide part 149, and the fourth guide part 149 is slidably disposed in the vertical guide groove 148. After the coffee liquid extraction is completed, the first pressing plug 104 moves out of the extraction chamber 102, and the rotating part 129 continues to rotate to The slag pusher 147 moves to the position of the inlet and outlet 103, and the second pressing plug 108 rises until the top surface is flush with the plane of the entrance and exit. The slag pusher 147 pushes out the residue under the push of the second swinging member 137, which reduces the need for operators to clean up the residue. the process of.

Further, as shown in FIGS. 2 and 12 , the slag pushing member 147 has an arc-shaped push notch 150 or a cylindrical pushing receiving cavity 156 , and the bottom of the cylindrical pushing receiving cavity has a slag inlet 157 .

In this embodiment, the slag pushing member 147 has an arc-shaped pushing gap 150, and the arc-shaped pushing gap 150 or the slag inlet 157 is the same size as the edge of the entrance and exit, which can improve the slag pushing effect of the slag pushing member 147.

Further, the frame body 128 has an accommodation space 151 and a waste material chute 152. The first pressing plug 104 is accommodated in the accommodation space 151 before moving to the extraction chamber 102. The waste material chute 152 and the accommodation space 151 are respectively located on both sides of the extraction barrel 101. The waste material chute One end of 152 close to the extraction tube 101 has a sloped portion 153, and the other end of the waste chute 152 has a bent portion 154.

In this embodiment, the frame 128 has an accommodating space 151 to allow the first pressing plug 104 to move out of the extraction chamber 102 and then move into the accommodating space 151 to ensure that the first pressing plug 104 is not above the extraction chamber 102 when cleaning the residue, ensuring that the first pressing plug 104 is not above the extraction chamber 102 when cleaning the residue. A pressure plug 104 causes inconvenience in cleaning the residue. There is also a waste chute 152 on the frame 128 for collecting the residue generated after coffee extraction. The waste chute 152 has an inclined surface 153 at one end close to the extraction cylinder 101. The residue pusher 147 pushes the residue material to the inclined portion 153, and the residue moves along the inclined surface. The part 153 slides down, slides to the bent part 154 at the other end of the waste chute 152, and then slides out into the waste storage device, thereby realizing automatic cleaning of residues.

Further, as shown in Figures 8 and 9, it also includes a pressure-maintaining component 301. The pressure-maintaining component 301 is arranged in the liquid outlet channel 105 and includes an annular edge 302. The annular edge 302 is arranged in the liquid outlet channel 105. The annular edge 302 has a Through hole 303, the stopper 304 is slidably arranged in the liquid outlet channel 105, and blocks the through hole 303 or unblocks the through hole 303 after sliding. The elastic member 305 acts on the stopper 304 to provide the force for the stopper 304 to block the through hole 303.

In this embodiment, in order to ensure the extraction effect of hot water on coffee powder, a pressure-maintaining component 301 is provided on the liquid outlet channel 105. The pressure-maintaining component 301 has an annular edge 302, a stopper 304, and an elastic member 305. The annular edge 302 There is a through hole 303 for coffee outflow. The stopper 304 is slidably disposed in the liquid outlet channel 105 and blocks or unblocks the through hole 303 after sliding. The elastic member 305 acts on the stopper 304 to provide the stopper 304 in When the coffee liquid in the through hole 303 is under pressure, it blocks the force of the through hole 303. The stopper 304 can ensure that the coffee liquid will not directly flow out of the liquid outlet channel 105 due to the pressure of hot water injected into the extraction chamber 102, ensuring that it will only flow out of the liquid outlet channel 105 when the pressure reaches the requirement. The coffee liquid will flow out later.

When extracting espresso coffee, the second pressure plug 108 and the first pressure plug 104 press the coffee powder cake to be thin and dense, and the liquid inlet channel 109 flows into the extraction chamber 102. When the coffee liquid in the extraction chamber 102 reaches a pressure of 9 bar, the elastic member The force provided by 305 will not be able to block the sliding of the stopper 304, and the stopper 304 will slide in the direction away from the annular edge 302. When the stopper 304 slides, the coffee liquid will flow out from the liquid outlet channel 105;

When extracting American coffee, the coffee powder cake pressed by the second pressure plug 108 and the first pressure plug 104 is thick and low in density. The liquid inlet channel 109 flows into the extraction chamber 102 with normal pressure hot water. Under the force provided by the elastic member 305 When the blocking member 304 cannot be blocked from sliding, the blocking member 304 slides in a direction away from the annular edge 302. After the hot water extraction is completed, the coffee liquid flows out from the liquid outlet channel 105.

Furthermore, the pressure maintaining assembly 301 further includes an adjusting bolt 306 that extends into the liquid outlet channel 105. One end of the elastic member 305 abuts the adjusting bolt 306 and the other end abuts the elastic member 305.

In this embodiment, an adjusting bolt 306 is provided on the pressure maintaining assembly 301 for adjusting the force of the elastic member 305 against the blocking member 304. When the adjusting bolt 306 is tightened, the force of the elastic member 305 against the blocking member 304 can be increased. Large, it is used for making Italian coffee. When the adjusting bolt 306 is loosened, the force of the elastic member 305 against the stopper 304 can be reduced, and it is used for making American coffee. By adjusting the adjusting bolt 306, the coffee machine can also be adapted to the production of both Italian coffee and Americano coffee by replacing the adjusting bolt 306 and/or the elastic member 305 with different lengths.

Furthermore, the stopper 304 is spherical, and the annular edge 302 has an annular spherical support part 307. The stopper 304 is in contact with the spherical support part 307.

In this embodiment, the stopper 304 is spherical, and the annular edge 302 has an annular spherical support part 307. The stopper 304 abuts the spherical support part 307, ensuring the sealing effect of the stopper 304 and the annular edge 302, and avoiding coffee liquid leakage. When the extraction is not completed, it flows out of the extraction chamber 102, ensuring the quality of the coffee.

This embodiment also proposes a coffee extraction working method, using the above-mentioned coffee extraction device to perform coffee extraction.

This embodiment also proposes a coffee machine, as shown in Figures 1, 2, 10, and 11, which includes the above-mentioned coffee extraction device and a liquid outlet assembly 201. The liquid outlet assembly 201 is connected to the liquid outlet 107 and includes an inner tube 202. The inner tube 202 is connected with the liquid outlet 107. The tube wall of the inner tube 202 has a first through hole 208. The outer tube 203 is arranged outside the inner tube 202 and forms an annular cavity 210 between the inner tube 202 and the outer tube 203. The tube wall has a second through hole 209. One end of the second through hole 209 is connected to the annular cavity 210 and the other end is connected to the atmosphere. The annular sleeve 204 is placed outside the inner tube 202 and blocks the first through hole 208. The annular sleeve 204 is acted upon by the coffee liquid flowing through the first through hole 208, the outer diameter increases and blocks the second through hole 209.

In this embodiment, considering that the coffee liquid outlet pipe of the existing technology will cause the coffee liquid to remain in the liquid outlet pipe under the action of atmospheric pressure after the coffee liquid is discharged, it is produced under the condition that the coffee liquid remains in the liquid outlet pipe. After the coffee liquid is released, the remaining coffee liquid in the liquid outlet pipe will be discharged together with the newly made coffee liquid, causing the quality of the coffee liquid to decline. In order to solve this problem, a liquid outlet assembly 201 is designed. The liquid outlet assembly includes an inner tube 202 and an outer tube. 203 and elastic set 204, the inner tube 202 is connected with the liquid outlet 107, the annular set 204 is placed outside the inner tube 202 and blocks the first through hole 208 on the inner tube 202, the outer tube 203 is arranged outside the inner tube 202 and An annular cavity 210 is formed with the inner tube. When the coffee liquid flows out, the annular set 204 blocks the second through hole 209 in the outer tube 203 under the action of the coffee liquid flowing through the first through hole 208, and the coffee liquid stops flowing out. When the ring set 204 fits the outer wall of the inner tube 202, the second through hole 209 is exposed, the annular cavity 210 is connected to the outside atmosphere, and the coffee liquid in the outlet pipe can flow out smoothly, passing through the inner tube 202, the outer tube 203 and the ring set 204. Used together, it can avoid the problem of coffee quality degradation caused by coffee liquid accumulated in the outlet pipe.

Further, the lower end of the inner tube 202 is higher than the lower end of the outer tube 203 and lower than the second through hole 209 .

In this embodiment, the lower end of the inner tube 202 is higher than the lower end of the outer tube 203 and lower than the second through hole 209 to ensure that the liquid outlet pipe is connected to the atmosphere at the same time when the second through hole 209 is connected to the atmosphere to ensure smooth outflow of the coffee liquid. .

Furthermore, the outer tube 203 has a reduced diameter section 205 , and the reduced diameter section 205 is located below the inner tube 202 .

In this embodiment, the outer tube 203 has a reduced diameter section 205. The reduced diameter section 205 is located below the inner tube 202 and is used to connect the liquid outlet pipe. The reduced diameter section 205 is a pagoda joint to facilitate connection with the liquid outlet pipe.

Further, the outer tube 203 is threadedly connected to the liquid outlet 107, the upper end of the annular cavity 210 is closed, and the lower end leads to the reduced diameter section 205. In this embodiment, the outer tube 203 is threadedly connected to the liquid outlet 107 to facilitate installation and maintenance.

Further, the liquid outlet assembly 201 also includes a liquid outlet hose 206, and the liquid outlet hose 206 is connected to the outer tube 203. The outer wall of the inner tube 202 also has a tapered convex edge 207, and the upper end of the annular sleeve 204 is stuck on the tapered convex edge 207.

In this embodiment, the outer wall of the inner tube 202 also has a tapered convex edge 207, and the upper end of the annular sleeve 204 is stuck on the tapered convex edge 207, so that the two are connected more closely.

Furthermore, the upper end of the inner tube 202 is provided with an annular seal 211. The annular seal 211 abuts the inner wall of the outer tube 203 and the outer wall of the inner tube 202 to facilitate sealing of the connection between the inner tube 202 and the outer tube 203.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. within.

Claims (10)

1. A coffee extraction device, comprising:

an extraction cartridge (101), the extraction cartridge (101) having an extraction chamber (102), the extraction chamber (102) having an inlet (103),

a first plunger (104), the first plunger (104) is movably arranged and passes through the inlet and outlet (103) after moving so as to enter or move out of the extraction cavity (102),

and a second pressing plug (108), wherein the second pressing plug (108) is arranged in the extraction cavity (102) in a sliding way, and the coffee powder is pressed between the first pressing plug (104) and the second pressing plug (108).

2. A coffee extraction device according to claim 1, wherein the first plunger (104) has a liquid outlet channel (105), the liquid outlet channel (105) having a liquid outlet inlet (106) and a liquid outlet (107), the liquid outlet inlet (106) being in communication with the extraction chamber (102),

The second tamponade (108) has a feed channel (109), the feed channel (109) having a feed inlet (110) and a feed outlet (111), the feed outlet (111) leading to the extraction chamber (102).

3. A coffee extraction device according to claim 2, further comprising:

the liquid collecting piece (112), the liquid collecting piece (112) is arranged on the first pressing plug (104) and forms a liquid collecting cavity (113) with the first pressing plug (104), the liquid collecting piece (112) is also provided with a plurality of liquid collecting through holes (114), the extraction cavity (102) is communicated with the liquid collecting through holes (114), the liquid collecting through holes (114) are communicated with the liquid collecting cavity (113), the liquid collecting cavity (113) is communicated with the liquid outlet channel (105),

the liquid separation piece (115), the liquid separation piece (115) set up on the second tamponade (108), with form branch liquid chamber (116) between the second tamponade (108), liquid separation piece (115) still have a plurality of liquid separation through-holes (117), feed liquor export (111) with divide liquid chamber (116) intercommunication, divide liquid chamber (116) with divide liquid through-hole (117) intercommunication, divide liquid through-hole (117) to open into extraction chamber (102).

4. A coffee extraction device according to claim 3, further comprising:

the separation bulge (118), the liquid collecting cavity (113) and the liquid separating cavity (116) are internally provided with a plurality of separation bulges (118), the liquid collecting cavity (113) and the liquid separating cavity (116) are also provided with annular guide grooves (marks), the liquid outlet inlet (106) and the liquid inlet outlet (111) are both positioned in the annular guide grooves, the separation bulge (118) is provided with a supporting surface (119), the supporting surface (119) faces the liquid collecting piece (112) and the liquid separating piece (115),

the annular sealing piece (120) is arranged on the first pressing plug (104) and the second pressing plug (108), and the annular sealing piece (120) is abutted with the extraction barrel (101).

5. A coffee extraction device according to claim 1, further comprising a linear drive assembly (121), the linear drive assembly (121) driving the second plunger (108) to move, comprising:

a first rotary drive (122),

a screw (123), the first rotation driving piece (122) drives the screw (123) to rotate,

A screw (124), the screw (124) is in threaded connection with the screw rod (123),

-a slider (125), the nut (124) being arranged on the slider (125), the second plunger (108) being arranged on the slider (125);

the slider (125) has a guide hole (126), the linear drive assembly (121) further comprising a guide (155), the guide (155) being located within the guide hole (126).

6. A coffee extraction device according to claim 1, further comprising a second drive assembly (127) and a frame (128), the second drive assembly (127) driving the first plunger (104) to move into and out of the extraction chamber (102), comprising:

a rotating member (129), the rotating member (129) being rotatably provided on the frame body (128), a shaft portion of the rotating member (129) having a first guide portion (130),

the first swinging piece (131), the first swinging piece (131) swings and sets up on the rotating piece (129), the support body (128) has first guide way (132) and second guide way (133), first guide way (132) are including interconnect's arc section (134) and vertical section (135), second guide way (133) are the arc, first swinging piece (131) have third guide part (136), third guide part (136) slip sets up in second guide way (133),

The second swinging piece (137), the second swinging piece (137) is provided with a second guide part (138) and a third guide groove (139), the second guide part (138) is arranged in the first guide groove (132) in a sliding way, the first guide part (130) is arranged in the third guide groove (139) in a sliding way, the first pressing plug (104) is arranged on the second swinging piece (137), and after the rotating piece (129) rotates, the second swinging piece (137) rotates along the arc-shaped section (134) firstly and then descends along the vertical section (135);

the second driving assembly (127) further comprises a poking plate (140), the poking plate (140) is arranged on the rotating member (129), the poking plate (140) is provided with an arc poking part (141), the first swinging member (131) is provided with a poked part (142), after the poking plate (140) rotates along with the rotating member (129), the arc poking part (141) touches the poked part (142) to enable the first swinging member (131) to swing,

a second rotary driving member (143),

an idler gear (144), the second rotation driving member (143) driving the idler gear (144), the idler gear (144) driving the rotation member (129) to rotate;

The rotary part (129) is provided with two first swinging parts (131), two second swinging parts (137) and two poking plates (140), the symmetrical arrangement is arranged on two sides of the frame body (128), the frame body (128) is provided with a transmission shaft (145), two ends of the transmission shaft (145) are respectively provided with a transmission gear (146), and the transmission gears (146) drive the rotary part (129) to rotate.

7. A coffee extraction device according to claim 6, further comprising a slag pushing member (147), said slag pushing member (147) being slidably arranged on said extraction cartridge (101) above said inlet/outlet (103), said slag pushing member (147) having a vertical guide slot (148), said second swinging member (137) having a fourth guide portion (149), said fourth guide portion (149) being slidably arranged within said vertical guide slot (148);

the slag pushing piece (147) is provided with an arc-shaped slag pushing notch (150) or a cylindrical slag pushing accommodating cavity (156), and the bottom of the cylindrical slag pushing accommodating cavity is provided with a slag inlet (157);

the frame body (128) has:

an accommodating space (151), the first plunger (104) being accommodated by the accommodating space (151) before moving to the extraction chamber (102),

The waste tank (152), waste tank (152) with accommodation space (151) are located respectively extraction section of thick bamboo (101) both sides, waste tank (152) are close to extraction section of thick bamboo (101) one end has bevel portion (153), waste tank (152) other end has kink (154).

8. A coffee extraction device according to claim 2, further comprising a dwell assembly (301), the dwell assembly (301) being arranged within the liquid outlet passage (105), comprising

An annular rim (302), the annular rim (302) being arranged in the liquid outlet channel (105), the annular rim (302) having a through hole (303),

a blocking piece (304), wherein the blocking piece (304) is arranged in the liquid outlet channel (105) in a sliding way, and blocks the through hole (303) or removes blocking the through hole (303) after sliding,

-an elastic member (305), said elastic member (305) acting on said stopper (304), providing a force of said stopper (304) against said through hole (303);

the pressure maintaining assembly (301) further comprises an adjusting bolt (306), the adjusting bolt (306) stretches into the liquid outlet channel (105), and one end of the elastic piece (305) is abutted with the adjusting bolt (306) while the other end is abutted with the elastic piece (305);

The baffle (304) is spherical, the annular edge (302) is provided with an annular spherical supporting part (307), and the baffle (304) is abutted with the spherical supporting part (307).

9. A coffee machine comprising a coffee extraction device according to any one of claims 1 to 8, further comprising a tapping assembly (201), said tapping assembly (201) being in communication with said tapping outlet (107), comprising:

an inner tube (202), wherein the inner tube (202) is communicated with the liquid outlet (107), the tube wall of the inner tube (202) is provided with a first through hole (208),

an outer tube (203), wherein the outer tube (203) is arranged outside the inner tube (202) and forms an annular cavity (210) with the inner tube (202), the tube wall of the outer tube (203) is provided with a second through hole (209), one end of the second through hole (209) is communicated with the annular cavity (210), the other end is communicated with the atmosphere,

an annular sleeve (204), wherein the annular sleeve (204) is sleeved outside the inner tube (202) and blocks the first through hole (208), and the annular sleeve (204) has an increased outer diameter and blocks the second through hole (209) after being acted by coffee liquid flowing through the first through hole (208);

The lower end of the inner tube (202) is higher than the lower end of the outer tube (203) and lower than the second through hole (209);

the outer tube (203) has a reduced diameter section (205), the reduced diameter section (205) being located below the inner tube (202);

the outer tube (203) is in threaded connection with the liquid outlet (107), the upper end of the annular cavity (210) is closed, and the lower end of the annular cavity is communicated with the diameter-reducing section (205);

the liquid outlet assembly (201) further comprises a liquid outlet hose (206), and the liquid outlet hose (206) is connected with the outer tube (203);

the outer wall of the inner tube (202) is also provided with a conical convex edge (207), and the upper end of the annular sleeve (204) is clamped on the conical convex edge (207);

the upper end of the inner tube (202) is provided with an annular sealing element (211), and the annular sealing element (211) is abutted with the inner wall of the outer tube (203) and the outer wall of the inner tube (202).

10. A coffee extraction method characterized in that the coffee extraction device according to any one of claims 1 to 8 is used for extracting coffee.