Brewing core of coffee machine

Abstract

The utility model discloses a brewing core of a coffee machine. The brewing core comprises a support, an ejector head, a brewing device, a movable filter plate and a water inlet pipe. A fixed filter plate is arranged at the rear end of the top head; a lead screw is rotatably mounted on the bracket; the support is provided with a guide groove, the brewing device is provided with a sliding block, and the sliding block is in sliding fit with the guide groove. The lead screw is positioned on the central axis of the brewing device; a central sleeve of the brewing device is in threaded screwing with the lead screw; a rear end plate of the brewing device is sleeved with a linkage rod in a sliding mode, the front end of the linkage rod is fixed to the movable filter plate, a nut is arranged at the rear end of the linkage rod, the linkage rod is sleeved with a pressure spring, the pressure spring abuts against the rear end plate and the nut, and in the initial state, the movable filter plate abuts against the front end of the lead screw; the water inlet pipe comprises a front pipe and a rear pipe, the front pipe is fixed with the movable filter plate, and the rear pipe is fixed with the rear end plate; the fixed filter plate and the movable filter plate are provided with a front sealing ring and a rear sealing ring, and the side wall of the brewing device is provided with a small-inner-diameter cavity used for being tightly matched with the front sealing ring and the rear sealing ring. The brewing core is stable in power transmission, and the width can be reduced.

Description

Technical Field

[0001] The utility model relates to a component of a coffee machine, in particular to a brewing core of a coffee machine. Background Art

[0002] The brewing core of a coffee machine is the core component used by the coffee machine to brew coffee. This application relates to a horizontal brewing core, that is, the main components of the core are distributed and move horizontally.

[0003] The horizontal coffee machine brewing core of the prior art includes a bracket, a top head, a brewer and a water inlet pipe; for the convenience of expression, the direction concept is unified first. In this application, the direction close to the top head is the front and the direction close to the brewer is the back; the bracket is fixed with a guide rod, the guide rod is slidably matched with a guide sleeve, the bracket is installed with a screw driven by a motor, and the screw is screwed with a sliding sleeve; the brewer opening faces the top head, the brewer powder receiving port is located on the side wall near the front port, a movable filter plate is provided in the brewer and a fixed filter plate is provided in the top head, a liquid outlet pipe is provided in the top head, the water inlet pipe is connected to the brewing chamber through the movable filter plate, and the liquid outlet pipe is connected to the brewing chamber through the fixed filter plate; there are two types of existing horizontal brewing cores, either the top head is fixed to the bracket and the brewer is a movable part, or the brewer is fixed to the bracket and the top head is a movable part, and the two sides of the movable part are respectively fixed to the sliding sleeve and the guide sleeve, so as to be driven by the ball screw.

[0004] However, in existing brewing cores, whether the top or brewing vessel is a moving part that works with a lead screw, all are driven eccentrically by the lead screw. The forward and backward power of the brewing core's moving parts is provided by a lead screw on one side. However, this eccentric drive mode affects the stability of power transmission, causing the various components to shake or even get stuck during movement, thereby reducing the smoothness and stability of the brewing core's subsequent actions such as powder receiving, powder pressing, brewing, and slag pushing. Furthermore, the lead screw and the transmission gear that fits the lead screw are both located on the side, which increases the overall width of the brewing core and does not conform to the current design aesthetic of lightweight and miniaturization. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a brewing core of a coffee machine which can improve the stability of power transmission and effectively reduce the width.

[0006] The technical solution of the present invention is to provide a brewing core of a coffee machine, which includes a bracket, a top head, a brewer, a movable filter plate and a water inlet pipe; the top head is fixed to the bracket, a fixed filter plate is provided at the rear end of the top head, a liquid outlet pipe is provided in the top head, and the liquid outlet pipe is connected to the brewing chamber through the fixed filter plate; the brewer opening faces the top head, and a powder receiving port is provided at the front of the side wall of the brewer; the bracket is rotatably mounted with a lead screw driven by a motor; the bracket is provided with a guide groove, and a slider is provided on at least one side of the brewer, and the slider is slidably matched with the guide groove; the lead screw is located on the central axis of the brewer, and a central sleeve is provided on the rear end plate of the brewer, and the central sleeve is screwed with the lead screw thread; the brewer A linkage rod is slidably fitted on the through hole of the rear end plate, the front end of the linkage rod is fixed to the rear end of the movable filter plate, a nut is provided at the rear end of the linkage rod, the rear section of the linkage rod is sleeved with a compression spring and both ends of the compression spring are in contact with the rear end plate and the nut. In the initial state, the movable filter plate is in contact with the front end of the lead screw under the action of the compression spring; the water inlet pipe includes a front pipe and a rear pipe for plugging and sealing with the front pipe, the front pipe is fixed at the rear end of the movable filter plate and the front pipe is connected to the brewing chamber through the movable filter plate, the rear pipe is fixed to the rear end plate and the rear pipe is connected to a water supply hose; the fixed filter plate is provided with a front sealing ring and the movable filter plate is provided with a rear sealing ring, and a small inner diameter chamber for tightly fitting with the above two sealing rings is provided in the middle and rear part of the side wall of the brewer.

[0007] The working process of this brewing core is as follows.

[0008] Initially, the brewer and movable filter plate are both in the rear-limit position, meaning the brewer is at the rear end of the lead screw, while the movable filter plate, acting on the compression spring, rests against the front end of the lead screw. The lead screw, brewer center sleeve, slider, and guide groove form a classic ball screw pair; forward rotation of the lead screw drives the brewer forward.

[0009] The brewer moves forward to the powder receiving position, and the front mouth of the brewer begins to cover the top head. The powder receiving port is located between the top head and the movable filter plate, and the small inner diameter chamber begins to tightly engage with the rear sealing ring of the movable filter plate. The fixed filter plate, brewer, and movable filter plate form an unclosed chamber with a powder receiving port, and the coffee machine grinder will add powder to this chamber.

[0010] The screw continues to rotate forward to move the brewer forward. At this time, the small inner diameter chamber of the brewer will carry the movable filter plate forward together to press the powder until the coffee powder is completely compacted. After that, the brewer is still driven by the screw to continue to move forward, but the movable filter plate is blocked and stopped by the compacted coffee powder, that is, the brewer moves forward and the movable filter plate stops, and the two are relatively displaced; until the powder receiving port of the brewer completely passes the fixed filter plate. At this time, the small inner diameter chamber and the front sealing ring of the fixed filter plate are also tightly matched, so that the small inner diameter chamber, the fixed filter plate, and the movable filter plate together form a completely sealed brewing chamber; and because the front pipe of the water inlet pipe is fixed to the movable filter plate and the rear pipe is fixed to the rear end plate of the brewer, as the movable filter plate stops and the brewer continues to move forward, the rear pipe of the water inlet pipe is sealed and plugged into the front pipe, thereby realizing the conduction of the water inlet pipe; hot water enters the sealed brewing chamber from the water inlet pipe, is brewed at high temperature and high pressure, and the brewed coffee liquid is discharged through the fixed filter plate and the liquid outlet pipe.

[0011] Reverse the lead screw and retract the brewer to separate it from the top head; in the early stage of retraction, the small inner diameter chamber is tightly engaged with the rear sealing ring of the movable filter plate, so the brewer will retract the movable filter plate together until the movable filter plate retracts to the front end of the lead screw; at this time, the brewing chamber is still driven by the lead screw to continue to retract, but the movable filter plate is pressed against the lead screw and remains stationary. The relative movement of the two achieves the effect of pushing the coffee residue, and the movable filter plate pushes the cake-like waste coffee residue after brewing out of the front mouth of the brewer.

[0012] From the above analysis, it can be seen that the brewing core mentioned above realizes a series of necessary functions such as adding powder, pressing powder, supplying water, high-pressure brewing, and pushing slag, under the premise of realizing the central drive of the lead screw. The central drive of the lead screw has a good transmission effect and a balanced and stable force, which can reduce the shaking and jamming of each action of the core, making the operation of the brewing core smooth and smooth, and also provides a stronger and more stable power for pressing powder, pushing slag, and brewing, and also provides a stronger and more stable brewing pressure. In addition, because the lead screw and transmission gear of the brewing core of the prior art are both located on the side, the total width of the existing core is the width of the brewer plus the width of the transmission gear, while the lead screw and transmission gear of the present application are both centered, and the width of the transmission gear coincides with the width of the brewer itself. Therefore, the central drive structure of the present application can significantly reduce the overall width of the brewing core; therefore, it can save more space and is naturally smaller in size, which is in line with the current design aesthetic concept of lightweight and miniaturization of home appliances.

[0013] Preferably, a metal transition sleeve is provided between the lead screw and the center sleeve. The center sleeve is a plastic part, the lead screw is a metal part, the inner thread of the center sleeve is screwed with the outer thread of the transition sleeve, and the inner thread of the transition sleeve is screwed with the outer thread of the lead screw.

[0014] In this way, a two-stage telescopic screw is formed; the operating law of the two-stage screw is that under normal conditions, the transition sleeve and the screw, which are both metal parts, will rotate relative to each other due to the small resistance, while the transition sleeve and the plastic center sleeve will not rotate relative to each other due to the large resistance, that is, when the screw rotates, the transition sleeve and the plastic center sleeve translate together as a whole; but when the transition sleeve is unable to translate due to resistance, the transition sleeve will rotate integrally with the screw, thereby driving the center sleeve to translate; to be precise, when the coffee powder is compacted, the transition sleeve is blocked and cannot translate and can only rotate with the screw. In addition, when the transition sleeve translates to the end of the screw thread, it can no longer translate and can only rotate. In addition, if there is no powder in the brewing chamber, the transition sleeve continues to move forward and is blocked by the top head, and can no longer move forward and can only rotate. However, the rotation of the transition sleeve can drive the brewer to continue moving forward. In this state, a powder-free sealed brewing chamber is formed, which is convenient for cleaning each pipeline after high-pressure water is passed.

[0015] From the above analysis, it can be seen that the secondary telescopic screw obtains the largest possible brewer stroke with the smallest possible length, shortening the overall length of the brewing core while fully ensuring the brewer stroke, further saving space and reducing the volume.

[0016] As another preferred embodiment, the bracket is rotatably equipped with a linkage shaft, a scraper plate is fixed on the linkage shaft, a linkage thread protrudes from the outside of the linkage shaft, a main torsion spring is fitted on the linkage shaft for causing the scraper plate to swing down to scrape the residue, and a linkage convex strip is provided on the slider for moving the linkage thread to drive the scraper plate to overcome the upward flipping of the main torsion spring; the scraper plate is passed through a powder outlet.

[0017] When the first round of brewing is finished, the brewer retracts to disengage from the top head, and the brewer carries the movable filter plate back to abut against the lead screw. Thereafter, the brewer continues to retract while the movable filter plate stops, thereby realizing slag pushing; and in the process of pushing slag, the linkage convex strip integrated with the brewer will synchronously retract and disengage from the linkage thread, so that the scraper plate swings under the action of the main torsion spring to scrape the slag; when the next round of powder brewing is received, the brewer drives the slider and the linkage convex strip forward together, thereby shifting the linkage thread, driving the scraper plate to overcome the main torsion spring and flip up, thereby making room for the brewer to avoid and free up the powder receiving station; and when the scraper plate is flipped to a horizontal position, the powder passing port of the scraper plate is just opposite the powder receiving port of the brewer, to ensure smooth powder adding.

[0018] As another preferred embodiment, the rear end plate of the brewer is provided with a through hole for the front pipe to pass through, and the front pipe is provided with a rear plug for sealingly plugging with the rear pipe, and the rear plug is provided with a double sealing ring; the rear pipe is screwed and fixed to the rear side of the rear end plate via a connecting frame; in this way, it is ensured that when the front and rear pipes are plugged in and sealed, the movable filter plate can completely fit the rear end plate of the brewer, ensuring that the brewing chamber has sufficient space; and the front and rear pipes are automatically docked to conduct the water inlet waterway, and during coffee brewing, the water pressure at the connection between the water inlet pipe and the brewing chamber is the largest, and the front and rear pipes of the present application are plugged in and sealed with double sealing rings, and the sealing effect is ideal enough; and the above-mentioned docking is achieved with the relative linkage of the brewer and the movable filter plate, saving an electromagnetic valve and further reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the brewing core of the coffee machine of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the brewing core of the utility model in the initial state with the upper cover of the bracket removed.

[0021] Figure 3 yes Figure 2 Schematic diagram of the structure of the brewing machine after half-section.

[0022] Figure 4 yes Figure 2 Schematic diagram of the structure after deflection at a certain angle.

[0023] Figure 5 It is a structural schematic diagram of the top of the brewing core of the utility model.

[0024] Figure 6 It is a structural diagram of the brewing device which is the brewing core of the utility model.

[0025] Figure 7 It is a schematic structural diagram of a half-section of the brewing device of the coffee machine of the present invention when the brewing core is in a powder receiving state.

[0026] Figure 8 It is a structural schematic diagram of a half-section of a brewer of the coffee machine in a brewing state.

[0027] Figure 9 It is a structural schematic diagram of the coffee machine of the utility model when the brewing core cleaning pipeline is in the state where the brewer and the top are completely pressed together.

[0028] Figure 10 It is a semi-sectional structural schematic diagram of the brewing core cleaning pipeline of the coffee machine of the utility model.

[0029] As shown in the figure: 1. bracket, 2. top head, 3. brewer, 3.1. rear end plate, 3.2. small inner diameter chamber, 4. movable filter plate, 5. fixed filter plate, 6. liquid outlet pipe, 7. powder receiving port, 8. screw, 9. guide groove, 10. slider, 11. center sleeve, 12. transition sleeve, 13. linkage rod, 14. nut, 15. compression spring, 16. front pipe, 17. rear pipe, 18. through hole, 19. rear plug, 20. connecting frame, 21. front sealing ring, 22. rear sealing ring, 23. linkage shaft, 24. scraper plate, 25. linkage thread, 26. main torsion spring, 27. linkage convex strip, 28. powder outlet. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 1 to 10 As shown, the brewing core of the coffee machine of the present invention includes a bracket 1, a top head 2, a brewing device 3, a movable filter plate 4 and a water inlet pipe. Again, the direction concept is unified. In this application, the direction close to the top head 2 is the front and the direction close to the brewing device 3 is the back.

[0032] The head 2 is fixed to the bracket 1. A fixed filter plate 5 is installed at the rear end of the head 2. A liquid outlet pipe 6 is installed within the head 2, connecting the liquid outlet pipe 6 to the brewing chamber through the fixed filter plate 5. The brewing chamber 3 opens toward the head 2. A powder receiving port 7 is located at the front of the side wall of the brewing chamber 3; this port is located near the front of the brewing chamber 3. As is common sense, the coffee machine's bean grinding device is located directly above the powder receiving port 7 when receiving powder. The powder receiving port 7 and the grinding device are facing each other to facilitate powder collection.

[0033] A lead screw 8, driven by an electric motor, is rotatably mounted on a bracket 1 via bearings. The lead screw 8 secures a transmission gear, which in turn is driven by the motor's output shaft. The bracket 1 is provided with a guide slot 9. A slider 10 is secured to at least one side of the brewer 3, slidingly engaging with the guide slot 9. This embodiment employs a slider 10 and guide slot 9 on only one side, but it is also possible to have sliders 10 on both sides, each slidingly engaging with the guide slot 9 on either side. The bracket 1 in this embodiment comprises a lower shell and an upper cover. The lower portion of the guide slot 9 is located on the lower shell, and the upper cover forms a complete channel when snapped into place.

[0034] Screw 8 is located on the central axis of brewer 3, meaning the axes of brewer 3, movable filter plate 4, and screw 8 coincide. A central sleeve 11 is provided on the rear end plate 3.1 of brewer 3. The lumen of central sleeve 11 extends through rear end plate 3.1 and is threadedly engaged with screw 8. This engagement can be direct, with the internal threads of central sleeve 11 threadedly engaged with the external threads of screw 8, or, as in the present embodiment, indirect, where a metal transition sleeve 12 is provided between screw 8 and central sleeve 11. Central sleeve 11 is plastic, while screw 8 is metal. The internal threads of central sleeve 11 threadably engage with the external threads of transition sleeve 12, which in turn threadably engage with the external threads of screw 8.

[0035] Two linkage rods 13 are slidably fitted onto the rear end plate 3.1 of the brewer 3 through two through-holes. The front end of each linkage rod 13 is fixed to the rear end of the movable filter plate 4. A nut 14 is mounted on the rear end of each linkage rod 13. A compression spring 15 is mounted on the rear end of each linkage rod 13, with both ends of the compression spring 15 resting against the rear end plate 3.1 and the corresponding nut 14. In the initial state, the movable filter plate 4 rests against the front end of the lead screw 8 under the action of the compression spring 15.

[0036] The water inlet pipe comprises a front pipe 16 and a rear pipe 17 that plugs and seals with the front pipe 16. The front pipe 16 is fixed to the rear end of the movable filter plate 4 and communicates with the brewing chamber through the movable filter plate 4. The rear pipe 17 is fixed to the rear end plate 3.1 and communicates with the water pump via a water supply hose. In this embodiment, a through hole 18 for the front pipe 16 to pass through is preferably provided in the rear end plate 3.1 of the brewer 3. The front pipe 16 is provided with a rear plug 19 for sealingly plugging with the rear pipe 17. This plug 19 is equipped with a double sealing ring. The rear pipe 17 is screwed to the rear side of the rear end plate 3.1 via a connecting bracket 20. Of course, the rear pipe 17 can also be positioned in front of the rear end plate 3.1 so that it extends through the rear end plate 3.1, thus achieving the same plug-in connection with the front pipe 16 to connect to the water inlet pipe.

[0037] The stationary filter plate 5 is fitted with a front sealing ring 21, while the movable filter plate 4 is fitted with a rear sealing ring 22. A small inner-diameter chamber 3.2, designed to tightly fit the front and rear sealing rings 21, 22, is located in the middle and rear portion of the sidewall of the brewer 3, behind the powder receiving port 7. The inner wall of the small inner-diameter chamber 3.2 is thickened, reducing its inner diameter and allowing it to engage with the corresponding sealing rings. When the small inner-diameter chamber 3.2 engages both the front and rear sealing rings 21, 22, the brewer 3, the stationary filter plate 5, and the movable filter plate 4 together form a sealed brewing chamber.

[0038] The upper cover of the bracket 1 is rotatably engaged with a linkage shaft 23, to which a scraper 24 is fixed. A linkage thread 25 protrudes from the linkage shaft 23, and a main torsion spring 26 is sleeved on the linkage shaft 23, which is used to swing the scraper 24 downward to scrape the residue. The slider 10 is provided with a linkage protrusion 27, which is used to shift the linkage thread 25, driving the scraper 24 to flip upward against the main torsion spring 26. When the brewer 3 and the slider 10 advance synchronously, the linkage protrusion 27 shifts the linkage thread 25. In this embodiment, the linkage thread 25 is a 1 / 4 thread, which causes the scraper 24 to swing up and down through 90 degrees. The scraper 24 is penetrated by a powder outlet 28. When the scraper 24 is tilted upward in the powder receiving state, the powder outlet 28 is located directly above the powder receiving port 7 of the brewer 3.

Claims

1. A brewing core of a coffee machine, comprising a bracket, a nozzle, a brewer, a movable filter plate, and a water inlet pipe; the nozzle is fixed to the bracket, a fixed filter plate is provided at the rear end of the nozzle, a liquid outlet pipe is provided within the nozzle, and the liquid outlet pipe is connected to the brewing chamber through the fixed filter plate; the brewer opens toward the nozzle, and a powder receiving port is provided at the front of the side wall of the brewer; a lead screw driven by a motor is rotatably mounted on the bracket; a guide groove is provided on the bracket, and a slider is provided on at least one side of the brewer, which slides in engagement with the guide groove; the characteristics are: The lead screw is located on the central axis of the brewer, and the rear end plate of the brewer is provided with a central sleeve, which is screwed with the lead screw thread; the through hole of the rear end plate of the brewer is slidably fitted with a linkage rod, the front end of the linkage rod is fixed to the rear end of the movable filter plate, and a nut is provided at the rear end of the linkage rod. The rear section of the linkage rod is sleeved with a compression spring and the two ends of the compression spring are in contact with the rear end plate and the nut. In the initial state, the movable filter plate is in contact with the front end of the lead screw under the action of the compression spring; the water inlet pipe includes a front pipe and a rear pipe for plugging and sealing with the front pipe, the front pipe is fixed at the rear end of the movable filter plate and the front pipe is connected to the brewing chamber through the movable filter plate, the rear pipe is fixed to the rear end plate and the rear pipe is connected to a water supply hose; the fixed filter plate is provided with a front sealing ring and the movable filter plate is provided with a rear sealing ring, and a small inner diameter chamber for tightly fitting with the above two sealing rings is provided at the middle and rear part of the side wall of the brewer.

2. The brewing core of the coffee machine according to claim 1, characterized in that: A metal transition sleeve is provided between the lead screw and the center sleeve. The center sleeve is a plastic part, and the lead screw is a metal part. The internal thread of the center sleeve is screwed with the external thread of the transition sleeve, and the internal thread of the transition sleeve is screwed with the external thread of the lead screw.

3. The brewing core of the coffee machine according to claim 1, characterized in that: The bracket is rotatable and matched with a linkage shaft, a scraper plate is fixed on the linkage shaft, a linkage thread is protruding from the linkage shaft, a main torsion spring for causing the scraper plate to swing down to scrape the residue is fitted on the linkage shaft, and a linkage convex strip is provided on the slider for toggling the linkage thread to drive the scraper plate to overcome the upward flipping of the main torsion spring; the scraper plate passes through a powder outlet.

4. The brewing core of the coffee machine according to claim 1, characterized in that: The rear end plate of the brewer is provided with a through hole for the front pipe to pass through. The front pipe is provided with a rear plug for sealing and plugging with the rear pipe. The rear plug is provided with double sealing rings. The rear pipe is screwed and fixed to the rear side of the rear end plate through a connecting frame.

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