Brewing core of coffee machine

Abstract

The invention discloses a brewing core of a coffee machine. The brewing core comprises a bracket, a top 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 invention 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 a core component used by the coffee machine to brew coffee. The present application relates to a transverse brewing core, that is, the main components of the core are distributed and move transversely.

[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 concept of direction 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 equipped with a lead screw driven by a motor, and the lead 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, the brewer is provided with a movable filter plate and the top head is provided with a fixed filter plate, the top head is provided with a liquid outlet pipe, 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 the prior art brewing core, whether it is the top or the brewer as a movable part that cooperates with the lead screw, it is all driven eccentrically by the lead screw. The advancing and retreating power of the movable part of the brewing core is provided by the lead screw on one side, but the eccentric drive mode will affect 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 series of actions such as powder receiving, powder pressing, brewing, and slag pushing; moreover, the lead screw and the transmission gear that the lead screw fits are all located on the side, which will increase the overall width of the brewing core, which does not conform to the current lightweight and miniaturized design aesthetic concept. Summary of the invention

[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 with 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 rear of the brewer A linkage rod is slidably fitted on the through hole of the end plate, the front end of the linkage rod is fixed to the rear end of the movable filter plate, a nut is arranged at the rear end of the linkage rod, a compression spring is sleeved on the rear section of the linkage rod and both ends of the compression spring are against the rear end plate and the nut, in the initial state, the movable filter plate is against 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 to the rear end of the movable filter plate and the front pipe is connected with the brewing chamber through the movable filter plate, the rear pipe is fixed to the rear end plate and the rear pipe is connected with 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] In the initial state, the brewer and the movable filter plate are both at the rear limit position, that is, the brewer is at the rear end of the lead screw, and the movable filter plate is against the front end of the lead screw under the action of the compression spring. The lead screw, the brewer center sleeve, the slider and the guide groove form a classic ball screw pair, and the forward rotation of the lead screw can drive 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 the chamber.

[0010] The screw continues to rotate forward to move forward to the brewer. 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; thereafter, the brewer is still driven by the screw to continue to move forward, but the movable filter plate is blocked and stationary by the compacted coffee powder, that is, the brewer moves forward while the movable filter plate is stationary, and the two are relatively displaced; until the powder receiving port of the brewer completely passes over 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 tube of the water inlet pipe is fixed to the movable filter plate and the rear tube is fixed to the rear end plate of the brewer, as the movable filter plate is stationary and the brewer continues to move forward, the rear tube of the water inlet pipe is sealed and plugged with the front tube to realize the conduction of the water inlet pipeline; hot water enters the sealed brewing chamber from the water inlet pipeline, 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 with it 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 residue, and the movable filter plate pushes the cake-like waste residue after brewing coffee out of the front mouth of the brewer.

[0012] From the above analysis, it can be seen that the above brewing core 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 good transmission effect and 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 overlaps within 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 the volume is naturally smaller, 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 lead screw is formed; the operating rule of the two-stage lead screw is that, under normal conditions, the transition sleeve and the lead 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 lead screw rotates, the transition sleeve and the plastic center sleeve translate together as a whole; but when the transition sleeve encounters resistance and cannot translate, the transition sleeve will rotate together with the lead 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 lead screw, and the transition sleeve translates to the end of the lead screw thread, and can no longer translate and can only rotate. In addition, if no powder is added to the brewing chamber, the transition sleeve will continue to move forward and can only rotate after being blocked by the abutment against the top head. However, the rotation of the transition sleeve can drive the brewer to continue to move 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 brewing machine stroke with the smallest possible length, shortening the overall length of the brewing core while fully ensuring the brewing machine stroke, further saving space and reducing the volume.

[0016] As another preferred embodiment, the bracket is rotatably matched with a linkage shaft, a scraper plate is fixed on the linkage shaft, a linkage thread protrudes outward from the linkage shaft, a main torsion spring for making the scraper plate swing down to scrape the residue is sleeved on the linkage shaft, 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 penetrated by a powder passing port.

[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, after which the brewer continues to retract while the movable filter plate is stationary, thereby achieving slag pushing; and in the process of slag pushing, the linkage convex strip integrated with the brewer will synchronously retract and disengage from the linkage thread, so that the scraper plate swings to scrape the slag under the action of the main torsion spring; when the next round of powder receiving brewing is in progress, 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 to the powder receiving port of the brewer, so as 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 tube to pass through, and the front tube is provided with a rear plug for sealing and plugging with the rear tube, and the rear plug is provided with a double sealing ring; the rear tube 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 tubes are plugged 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 tubes 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 sealing effect is ideal enough due to the structure of the front and rear tubes plugged in combined with the double sealing ring sealing; 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 the cost. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 It is a schematic diagram of the structure of the brewing core of the present invention in the initial state with the upper cover of the support 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 schematic structural diagram of the top of the brewing core of the present invention.

[0024] Figure 6 It is a schematic diagram of the structure of the brewer which is the brewing core of the present invention.

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

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

[0027] Fig. 9 It is a schematic structural diagram of the coffee machine of the present invention when the brewer and the top are completely pressed to death in the brewing core cleaning pipeline state.

[0028] Fig.10 It is a semi-sectional structural schematic diagram of the brewing core cleaning pipeline of the coffee machine of the present invention.

[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 tube, 17. rear tube, 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 passing port. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with 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 brewer 3, a movable filter plate 4 and a water inlet pipe. Again, the concept of direction is unified. In this application, the direction close to the top head 2 is the front and the direction close to the brewer 3 is the back.

[0032] The top head 2 is fixed to the bracket 1, and a fixed filter plate 5 is provided at the rear end of the top head 2. A liquid outlet pipe 6 is provided inside the top head 2, and the liquid outlet pipe 6 is connected to the brewing chamber through the fixed filter plate 5. The brewer 3 opens toward the top head 2, and a powder receiving port 7 is provided at the front of the side wall of the brewer 3; the powder receiving port 7 is close to the front opening of the brewer 3. It is known from common sense that in the powder receiving state, the coffee machine's bean grinding device is located directly above the powder receiving port 7, and the powder receiving port 7 and the bean grinding device are directly opposite to each other for powder receiving.

[0033] The bracket 1 is rotatably mounted with a lead screw 8 driven by a motor via a bearing; the lead screw 8 fixes the transmission gear, and the output shaft of the motor drives the transmission gear. The bracket 1 is provided with a guide groove 9, and a slider 10 is fixed to at least one side of the brewer 3, and the slider 10 is slidably matched with the guide groove 9. In the present application, only one side is provided with a slider 10 and a guide groove 9, but both sides may also be provided with sliders 10, which are slidably matched with the guide grooves 9 on both sides. The bracket 1 of the present application is divided into a lower shell and an upper cover, and the lower part of the guide groove 9 is located on the lower shell, and a complete channel is formed after the upper cover is buckled.

[0034] The lead screw 8 is located on the central axis of the brewer 3, that is, the axes of the brewer 3, the movable filter plate 4 and the lead screw 8 coincide with each other. The rear end plate 3.1 of the brewer 3 is provided with a central sleeve 11, the lumen of the central sleeve 11 passes through the rear end plate 3.1, and the central sleeve 11 is threadedly engaged with the lead screw 8. The above-mentioned screwing can be a direct screwing of the inner thread of the central sleeve 11 with the outer thread of the lead screw 8, or an indirect screwing as in the present embodiment, that is, a metal transition sleeve 12 is provided between the lead screw 8 and the central sleeve 11, the central sleeve 11 is a plastic part, the lead screw 8 is a metal part, the inner thread of the central sleeve 11 is screwed with the outer thread of the transition sleeve 12, and the inner thread of the transition sleeve 12 is screwed with the outer thread of the lead screw 8.

[0035] Two linkage rods 13 are slidably sleeved on the rear end plate 3.1 of the brewer 3 through two through holes, and the front end of each linkage rod 13 is fixed to the rear end of the movable filter plate 4. A nut 14 is arranged at the rear end of each linkage rod 13. A compression spring 15 is sleeved on the rear section of each linkage rod 13, and the two ends of the compression spring 15 abut against the rear end plate 3.1 and the corresponding nut 14. In the initial state, the movable filter plate 4 abuts against the front end of the lead screw 8 under the action of the compression spring 15.

[0036] The water inlet pipe includes a front pipe 16 and a rear pipe 17 for plugging and sealing with the front pipe 16. The front pipe 16 is fixed at 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 through a water supply hose. In this embodiment, preferably, a through hole 18 for the front pipe 16 to pass through is provided on the rear end plate 3.1 of the brewer 3. The front pipe 16 is provided with a rear plug 19 for sealing and plugging with the rear pipe 17. The rear plug 19 is provided with a double sealing ring; the rear pipe 17 is screwed and fixed to the rear side of the rear end plate 3.1 through a connecting frame 20. Of course, the rear pipe 17 can also be arranged at the front side of the rear end plate 3.1 and made to pass through the rear end plate 3.1, which can also achieve the effect of plugging and connecting with the front pipe 16 to the water inlet pipeline.

[0037] The fixed filter plate 5 is provided with a front sealing ring 21 on its outer ring, and the movable filter plate 4 is provided with a rear sealing ring 22 on its outer ring. A small inner diameter chamber 3.2 for tight fit with the front sealing ring 21 and the rear sealing ring 22 is provided at the middle and rear part of the side wall of the brewer 3, i.e., the part of the side wall located behind the powder receiving port 7. The inner wall of the small inner diameter chamber 3.2 is thickened, thereby reducing the inner diameter and clamping with the corresponding sealing ring. When the small inner diameter chamber 3.2 clamps the front sealing ring 21 and the rear sealing ring 22 at the same time, the brewer 3, the fixed 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 matched with a linkage shaft 23, on which a scraper plate 24 is fixed, and a linkage thread 25 is protruding from the linkage shaft 23, and a main torsion spring 26 for causing the scraper plate 24 to swing down to scrape the residue is sleeved on the linkage shaft 23; the slider 10 is provided with a linkage convex strip 27 for shifting the linkage thread 25 to drive the scraper plate 24 to turn up to overcome the main torsion spring 26; when the brewer 3 and the slider 10 move forward synchronously, the linkage convex strip 27 will shift the linkage thread 25, and the linkage thread 25 in this embodiment is a 1 / 4 thread, so that the scraper plate 24 swings up and down by 90 degrees. The scraper plate 24 is penetrated by a powder passing port 28, and in the powder receiving state, when the scraper plate 24 turns up, the powder passing port 28 is just located above the powder receiving port 7 of the brewer 3.

Claims

1. A brewing core of a coffee machine, comprising 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 with 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; a lead screw driven by a motor is rotatably installed on the bracket; a guide groove is provided on the bracket, and a slider is provided on at least one side of the brewer, and the slider is slidably matched with the guide groove; Features: 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; a linkage rod is slidably fitted on the through hole of the rear end plate of the brewer, and 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, and a compression spring is sleeved on the rear section of the linkage rod and the two ends of the compression spring are against the rear end plate and the nut. In the initial state, the movable filter plate is against 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 to the rear end of the movable filter plate and the front pipe is connected with the brewing chamber through the movable filter plate, the rear pipe is fixed to the rear end plate and the rear pipe is connected with 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.

2. The brewing core of the coffee machine according to claim 1, Features: 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.

3. The brewing core of the coffee machine according to claim 1, Features: The bracket is rotatably matched with a linkage shaft, a scraper plate is fixed on the linkage shaft, a linkage thread is convex outside the linkage shaft, a main torsion spring for making the scraper plate swing down to scrape the residue is sleeved on the linkage shaft, and a linkage convex strip for shifting the linkage thread to drive the scraper plate to overcome the main torsion spring to flip up is provided on the slider; the scraper plate is penetrated by a powder passing port.

4. The brewing core of the coffee machine according to claim 1, Features: 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, and 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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