A multi-layer filter stack for a coffee water washing device

Abstract

The utility model provides a kind of multilayer filter superposition structure of coffee water washing device belongs to coffee bean processing technical field, the multilayer filter superposition structure of this coffee water washing device includes filter cylinder, water distribution disc, multilayer filter screen assembly, drainage collection tank, support fixing frame and sealing ring component;Filter cylinder is cylindrical structure, the top of filter cylinder is equipped with water inlet, bottom is equipped with water outlet;Water distribution disc is circular disc structure, water distribution disc is fixedly arranged in the top end position inside filter cylinder, the central position of water distribution disc is equipped with center water inlet hole, and the circumferential edge of water distribution disc is evenly distributed with at least 12 shunt holes;Multilayer filter screen assembly includes first filter screen layer, second filter screen layer and third filter screen layer, three filter screen layers are sequentially superimposed along the axial direction of filter cylinder;The utility model can solve the problem of low filtering efficiency and uneven filtering in the process of coffee bean water washing in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of coffee bean processing technology, and specifically relates to a multi-layer filter stacking structure for a coffee washing device. Background Technology

[0002] Coffee washing technology is a crucial step in coffee post-processing, primarily used to remove the pectin layer and other impurities from the surface of coffee beans, significantly impacting the final quality of the coffee. Traditional coffee washing devices mainly employ single-screen filters or simple multi-layer filtration structures, which suffer from numerous technical shortcomings in practical applications. Existing filtration systems typically use flat screen designs, resulting in limited filtration area and susceptibility to localized clogging, leading to a sharp decline in filtration efficiency. Furthermore, the water distribution systems in traditional devices are often rudimentary, employing simple top-inlet methods that fail to achieve uniform water flow distribution, causing uneven water flow within the filtration area, with some areas overloaded while others are underutilized. In addition, the filter support structures in existing devices often use simple frame designs with insufficient strength, making them prone to deformation over long-term use and affecting the stability of filtration accuracy. Regarding sealing systems, traditional devices often use simple mechanical seals or flat seals, resulting in poor sealing performance and a tendency to leak, wasting processed liquid and affecting filtration efficiency. In terms of temperature control, existing devices lack effective heat dissipation designs, easily leading to overheating during continuous operation and impacting coffee quality. To address these technical problems, existing technologies mainly employ methods such as increasing the number of filter layers, raising water pump pressure, or extending filtration time. However, these methods often only treat the symptoms and not the root cause, failing to fundamentally solve the problems of uneven filtration and low efficiency. Furthermore, they can easily lead to increased energy consumption and accelerated equipment wear. Utility Model Content

[0003] In view of this, the present invention provides a multi-layer filter stacking structure for a coffee washing device, which can solve the problems of low filtration efficiency and uneven filtration in the coffee bean washing process in the prior art.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a multi-layer filter stacking structure for a coffee washing device, comprising a filter cylinder, a water distribution plate, a multi-layer filter screen assembly, a drainage collection tank, a support frame, and a sealing ring assembly. The filter cylinder has a cylindrical structure with an inlet at the top and an outlet at the bottom. The water distribution plate has a circular disc structure and is fixedly installed at the top of the filter cylinder. A central inlet hole is located at the center of the water distribution plate, and at least 12 diversion holes are evenly distributed along its circumference. The multi-layer filter screen assembly includes... The filter comprises a first filter layer, a second filter layer, and a third filter layer, which are stacked sequentially along the axial direction of the filter cylinder. The mesh diameter of the first filter layer is 0.8 mm to 1.2 mm, the mesh diameter of the second filter layer is 0.4 mm to 0.6 mm, and the mesh diameter of the third filter layer is 0.1 mm to 0.3 mm. The support frame includes an annular support ring and connecting support rods. The inner diameter of the annular support ring matches the inner diameter of the filter cylinder, and the connecting support rods are radially distributed, connecting the center and edge positions of the annular support ring.

[0006] The technical advantages of the multi-layer filter stacking structure of the coffee washing device provided by this utility model are as follows: By setting up a multi-layer filter screen assembly stacking structure, layered filtration of impurities of different particle sizes in the coffee liquid is achieved. The diversion hole design of the water flow distribution plate ensures uniform distribution of water flow within the filter cylinder, avoiding the problem of excessive local filtration load. The radial connecting support rod structure of the support and fixing frame provides stable support for the multi-layer filter screen, preventing deformation of the filter screen under the impact of water flow. The setting of the sealing ring assembly effectively prevents water leakage and improves filtration efficiency. The entire device has a compact structure, and the various components are precisely matched, achieving highly efficient filtration in the coffee washing process.

[0007] Based on the above technical solution, the multi-layer filter stacking structure of the coffee washing device of this utility model can be further improved as follows:

[0008] The drainage collection trough has a circular structure and is fixedly installed on the bottom outer side of the filter cylinder. The inner wall of the drainage collection trough is connected and fixed to the outer wall of the filter cylinder by bolts. The bottom of the drainage collection trough is provided with a drainage outlet, and a control valve is provided at the drainage outlet.

[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the annular structure design of the drainage collection tank can effectively collect the filtered liquid flowing out from the bottom of the filter cylinder, avoiding liquid loss and contamination. The bolted connection ensures a stable connection between the drainage collection tank and the filter cylinder, preventing loosening under the impact of water flow. The control valve allows for precise control of the drainage flow rate, making it easy for operators to adjust the drainage speed according to actual needs, thus improving the ease of operation and controllability of the filtration effect.

[0010] Furthermore, the sealing ring assembly includes an upper sealing ring and a lower sealing ring. The upper sealing ring is disposed between the water flow distribution plate and the inner wall of the filter cylinder, and the lower sealing ring is disposed between the third filter screen layer and the inner wall of the filter cylinder. The sealing ring assembly is made of silicone material, and the cross-section of the sealing ring is O-shaped. The outer diameter of the sealing ring is tightly fitted with the inner diameter of the filter cylinder.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The sealing ring assembly is made of silicone material, which has good elasticity and sealing performance, and can maintain a stable sealing effect during long-term use. The separate setting of the upper and lower sealing rings ensures the seal between the water flow distribution plate and the third filter screen layer and the filter cylinder, preventing water from bypassing the filter screen and flowing out directly, thus ensuring the integrity of filtration. The O-shaped cross-section design allows the sealing ring to form a good surface contact with the inner wall of the filter cylinder, enhancing the sealing effect and reducing the decrease in filtration efficiency caused by poor sealing.

[0012] Furthermore, the annular support rings of the support frame are respectively set between the first filter layer and the second filter layer and between the second filter layer and the third filter layer. There are 6 connecting support rods, which are evenly distributed on the annular support ring at a 60-degree angle. The cross-section of the connecting support rods is T-shaped.

[0013] The beneficial effects of the above-mentioned improved design are as follows: the layered design of the support frame between different filter layers provides independent support for each filter layer, preventing the multiple filter layers from being squeezed and deformed by gravity and water flow. The even distribution of the connecting support rods at a 60-degree angle ensures the uniform transmission of support force and avoids local stress concentration. The T-shaped cross-section structure increases the bending strength of the connecting support rods and improves the stability of the entire support system. This precise geometric distribution design ensures that the filter screen remains flat during long-term use and maintains stable filtration performance.

[0014] Furthermore, the inner wall of the filter cylinder is provided with a threaded structure with a pitch of 2 mm to 4 mm and a thread depth of 1 mm to 2 mm. The threaded structure is used to guide the water flow to form a rotating flow state.

[0015] The beneficial effects of adopting the above-mentioned improved design are as follows: The threaded structure design on the inner wall of the filter cylinder guides the water flow into a rotating flow, increasing the contact time and contact area between the water flow and coffee particles, thus improving the washing effect. Precise control of the thread pitch and thread depth ensures moderate water flow rotation intensity, which effectively washes coffee particles without causing excessive turbulence that could affect the filter screen's operation. The rotating flow helps prevent coffee particles from accumulating on the filter screen surface, reducing filter screen clogging, extending the filter screen's lifespan, and improving the overall efficiency of the device.

[0016] Furthermore, the upper surface of the water distribution plate is provided with a concentric annular protrusion structure, which includes an inner ring protrusion and an outer ring protrusion. The diameter of the inner ring protrusion is one-third of the diameter of the water distribution plate, and the diameter of the outer ring protrusion is two-thirds of the diameter of the water distribution plate. The protrusion height is 3 mm to 5 mm.

[0017] The beneficial effects of the above-mentioned improvement scheme are as follows: the concentric annular protrusions on the upper surface of the water distribution plate can further optimize the water flow distribution. The different diameters of the inner and outer annular protrusions enable regional distribution of water flow. This structural design allows the water flow to form a more uniform velocity distribution when passing through the diversion holes, avoiding the problem of excessively fast flow velocity in the central area and excessively slow flow velocity in the edge area. Precise control of the protrusion height ensures that the water flow forms an appropriate buffer on the surface of the distribution plate, reducing the direct impact of the water flow, protecting the structural integrity of the filter screen below, and improving the uniformity of water flow distribution.

[0018] Furthermore, the outer wall of the filter cylinder is provided with multiple heat dissipation fins, which are rectangular in shape and arranged along the axial direction of the filter cylinder.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the multiple heat dissipation fins on the outer wall of the filter cylinder effectively increase the heat exchange area between the device and the external environment, accelerating the heat dissipation rate of the coffee liquid during the filtration process. The rectangular plate-shaped heat dissipation fins have good heat dissipation efficiency, and their axial arrangement does not affect the overall structural compactness of the device. Through effective heat dissipation design, the coffee liquid's taste and quality are prevented from being affected by excessively high temperatures during filtration, while also avoiding adverse effects of high temperatures on the filter material's performance.

[0020] Furthermore, the filter layers of the multi-layer filter assembly all have a wavy structure, with the peak height of the wavy structure being 5 mm to 8 mm and the trough depth being 3 mm to 5 mm.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The wave-shaped structure design of the multi-layer filter screen significantly increases the effective filtration area, improving filtration capacity and efficiency. The height difference between the crests and troughs forms a three-dimensional filtration channel, increasing the residence time of the water flow and improving the thoroughness of filtration. The wave-shaped structure also has self-cleaning properties, reducing the adhesion of impurities to the filter screen surface under the impact of water flow, thus reducing the frequency of filter screen cleaning. This structural design also enhances the mechanical strength of the filter screen, improving its resistance to deformation and service life.

[0022] Furthermore, the inner wall of the drainage collection trough is provided with a serrated groove structure, the tooth height of which is 2 mm to 4 mm and the tooth width is 3 mm to 6 mm.

[0023] The beneficial effects of the above-mentioned improvement scheme are as follows: the serrated groove structure on the inner wall of the drainage collection tank effectively increases the contact area between the liquid and the inner wall of the collection tank, promoting thorough mixing and uniform flow of the liquid. The serrated structure also acts as a guide, directing the liquid towards the drainage outlet and preventing stagnation and accumulation of liquid in the collection tank. The tooth height and tooth width of the grooves are optimized to both guide the flow and avoid creating excessive flow resistance. This structural design improves drainage smoothness and reduces the workload of cleaning and maintenance.

[0024] Furthermore, there are at least eight heat dissipation fins, which are equidistantly distributed along the circumference on the outer wall of the filter cylinder, with the spacing between adjacent heat dissipation fins being one-eighth of the circumference of the filter cylinder.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: Precise control of the number and distribution of heat dissipation fins ensures uniform heat dissipation on the filter cylinder surface, avoiding localized overheating. The arrangement of at least eight heat dissipation fins provides ample heat dissipation area, and their equidistant distribution along the circumference ensures consistent heat dissipation. Precise control of the spacing between adjacent heat dissipation fins ensures effective heat dissipation while preventing mutual interference between them. This uniformly distributed heat dissipation structure design effectively improves the thermal stability of the device, ensuring stable temperature control during the coffee washing process.

[0026] Compared with existing technologies, the multi-layer filter stacking structure of the coffee washing device provided by this utility model has the following advantages: Through innovative multi-layer filter stacking structure design, it effectively solves the technical problems of low filtration efficiency and uneven filtration in traditional coffee washing devices. The use of three layers of filter screens with different mesh diameters achieves layered filtration. The gradient filtration design from coarse to fine ensures effective removal of impurities of different particle sizes, significantly improving filtration accuracy and efficiency. Secondly, the innovative design of the water flow distribution plate, through the cooperation of the central inlet hole and the circumferential diversion hole, achieves uniform water flow distribution in the filtration area, eliminating the local overload problem common in traditional devices. Thirdly, the radial structure of the support frame provides stable and reliable support for the multi-layer filter screens, preventing deformation and displacement of the filter screens during operation and ensuring the stability of filtration accuracy. Furthermore, the O-ring design of the sealing ring assembly and the selection of silicone material ensure the system's sealing performance, preventing filtration efficiency loss caused by water leakage. The threaded structure on the inner wall of the filter cylinder and the heat dissipation fin design on the outer wall further optimize water flow dynamics and temperature control, improving overall performance. Through these technological improvements, this invention achieves efficient, uniform, and stable filtration in the coffee washing process, representing a significant technological advancement compared to existing technologies. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a multi-layer filter stacking structure for a coffee washing device;

[0029] Figure 2 A schematic diagram of a water distribution plate for a multi-layered filter stacked structure in a coffee washing device;

[0030] Figure 3 A schematic diagram of the cross-section of the water distribution plate and the multi-layer filter assembly;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Filter cylinder; 11. Water distribution plate; 12. Multi-layer filter screen assembly; 13. Drainage collection tank; 14. Support frame; 15. Sealing ring assembly; 16. Water inlet; 17. Water outlet; 18. Central water inlet hole; 19. Diverting hole; 20. First filter screen layer; 21. Second filter screen layer; 22. Third filter screen layer; 23. Annular support ring; 24. Connecting support rod; 25. Inner ring protrusion; 26. Outer ring protrusion. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3The image shows an embodiment of a multi-layer filter stacking structure for a coffee washing device provided by this utility model. In this embodiment, it includes a filter cylinder 10, a water distribution plate 11, a multi-layer filter assembly 12, a drainage collection tank 13, a support frame 14, and a sealing ring assembly 15. The filter cylinder has a cylindrical structure, with an inlet 16 at the top and an outlet 17 at the bottom. The water distribution plate has a circular disc structure and is fixedly installed at the top of the filter cylinder. A central inlet hole 18 is located at the center of the water distribution plate, and at least 12 diversion holes are evenly distributed along the circumference of the water distribution plate. 19; The multi-layer filter assembly includes a first filter layer 20, a second filter layer 21, and a third filter layer 22. The three filter layers are stacked sequentially along the axial direction of the filter cylinder. The mesh diameter of the first filter layer is 0.8 mm to 1.2 mm, the mesh diameter of the second filter layer is 0.4 mm to 0.6 mm, and the mesh diameter of the third filter layer is 0.1 mm to 0.3 mm. The support frame includes an annular support ring 23 and connecting support rods 24. The inner diameter of the annular support ring matches the inner diameter of the filter cylinder. The connecting support rods are radially distributed, connecting the center and edge positions of the annular support ring.

[0035] In the above technical solution, the drainage collection trough has a circular structure and is fixedly installed on the bottom outer side of the filter cylinder. The inner wall of the drainage collection trough is fixed to the outer wall of the filter cylinder by bolts. The bottom of the drainage collection trough is provided with a drainage outlet, and a control valve is provided at the drainage outlet.

[0036] Furthermore, in the above technical solution, the sealing ring assembly includes an upper sealing ring and a lower sealing ring. The upper sealing ring is disposed between the water flow distribution plate and the inner wall of the filter cylinder, and the lower sealing ring is disposed between the third filter screen layer and the inner wall of the filter cylinder. The sealing ring assembly is made of silicone material, and the cross-section of the sealing ring is O-shaped. The outer diameter of the sealing ring is tightly fitted with the inner diameter of the filter cylinder.

[0037] Furthermore, in the above technical solution, the annular support rings of the support fixing frame are respectively set between the first filter layer and the second filter layer and between the second filter layer and the third filter layer. The number of connecting support rods is 6, and the connecting support rods are evenly distributed on the annular support ring at a 60-degree angle. The cross-section of the connecting support rods is T-shaped.

[0038] Furthermore, in the above technical solution, the inner wall of the filter cylinder is provided with a threaded structure, the thread pitch of which is 2 mm to 4 mm and the thread depth is 1 mm to 2 mm. The threaded structure is used to guide the water flow to form a rotating flow state.

[0039] Furthermore, in the above technical solution, the upper surface of the water distribution plate is provided with a concentric annular protrusion structure, which includes an inner ring protrusion 25 and an outer ring protrusion 26. The diameter of the inner ring protrusion is one-third of the diameter of the water distribution plate, the diameter of the outer ring protrusion is two-thirds of the diameter of the water distribution plate, and the protrusion height is 3 mm to 5 mm.

[0040] Furthermore, in the above technical solution, the outer wall of the filter cylinder is provided with multiple heat dissipation fins, which are rectangular sheet-like structures and are arranged along the axial direction of the filter cylinder.

[0041] Furthermore, in the above technical solution, the filter layers of the multi-layer filter assembly all have a wavy structure, with the peak height of the wavy structure being 5 mm to 8 mm and the trough depth being 3 mm to 5 mm.

[0042] Furthermore, in the above technical solution, the inner wall of the drainage collection tank is provided with a sawtooth groove structure, the tooth height of the sawtooth groove is 2 mm to 4 mm, and the tooth width is 3 mm to 6 mm.

[0043] Furthermore, in the above technical solution, the number of heat dissipation fins is at least 8, and the multiple heat dissipation fins are equidistantly distributed along the circumferential direction on the outer wall of the filter cylinder, and the distance between adjacent heat dissipation fins is one-eighth of the circumference of the filter cylinder.

[0044] The method of using this utility model is as follows: First, pre-treatment preparation work needs to be carried out on the equipment. Check the integrity and cleanliness of each layer of filter screen, and ensure that the first, second, and third filter screen layers in the multi-layer filter screen assembly are installed in place and without damage. At the same time, check whether the upper and lower sealing rings of the sealing ring assembly are correctly installed in the designated positions. Next, the coffee beans to be processed and an appropriate amount of clean water are mixed in a predetermined ratio to prepare coffee liquid, which is then slowly injected into the device through the water inlet at the top of the filter cylinder. After the coffee liquid enters the device, it first comes into contact with the water distribution plate, enters the distribution plate through the central water inlet, and then is evenly distributed through 12 evenly distributed diversion holes on the circumferential edge. Under the guidance of the concentric ring-shaped protrusion structure, a radially evenly distributed water flow is formed. The diverted coffee liquid passes through the three layers of filter screen assembly in sequence. The first filter screen layer first intercepts larger particles of impurities, the second filter screen layer further filters medium-sized particles of impurities, and the third filter screen layer finally removes fine impurities, realizing layered progressive filtration. During filtration, the threaded structure on the inner wall of the filter cylinder guides the coffee liquid into a swirling flow, enhancing the washing effect and preventing filter clogging. The filtered, clean coffee liquid flows into the drain collection tank through the outlet at the bottom of the filter cylinder. Operators can adjust the control valve to control the drainage speed as needed. Throughout the filtration process, the heat dissipation fins continuously dissipate heat, maintaining a suitable operating temperature. After operation, turn off the water inlet and wait for the liquid in the device to be completely drained before cleaning and maintenance. Regularly replace the filter screen and check the condition of the sealing rings.

[0045] The following is a specific embodiment 1 of this utility model: In this embodiment, the filter cylinder is made of food-grade 304 stainless steel, which has good corrosion resistance and mechanical strength. The outer diameter of the cylinder is 300 mm, the inner diameter is 280 mm, the height is 500 mm, and the wall thickness is 10 mm. The inner wall of the filter cylinder is machined with a right-hand thread with a pitch of 3 mm and a thread depth of 1.5 mm. The thread extends from the top of the cylinder to 100 mm from the bottom, forming a complete flow-guiding spiral channel. The water distribution plate is made of the same 304 stainless steel, with an outer diameter of 275 mm and a thickness of 15 mm. The diameter of the central inlet hole is 40 mm, and 12 diversion holes are evenly distributed around the circumference, each with a diameter of 8 mm. In the concentric annular protrusion structure on the upper surface of the distribution plate, the inner ring protrusion has a diameter of 90 mm, the outer ring protrusion has a diameter of 180 mm, the protrusion height is 4 mm, and the top of the protrusion is arc-shaped to reduce water flow resistance. The multi-layer filter assembly is made of high-strength stainless steel wire. The first filter layer has a mesh diameter of 1.0 mm, the second filter layer has a mesh diameter of 0.5 mm, and the third filter layer has a mesh diameter of 0.2 mm. Each filter layer has a diameter of 270 mm and adopts a wave-shaped structure with a peak height of 6 mm, a trough depth of 4 mm, and a wavelength of 20 mm. The annular support ring of the support frame is made of aluminum alloy with an outer diameter of 275 mm, an inner diameter of 50 mm, and a thickness of 8 mm. The six connecting support rods adopt a T-shaped cross-section design with a flange width of 12 mm, a web thickness of 3 mm, and a support rod length of 112.5 mm. The sealing ring assembly is made of food-grade silicone with an outer diameter of 280 mm, an inner diameter of 260 mm, and a cross-sectional diameter of 10 mm, providing good elasticity and sealing performance. The drainage collection tank is made of 304 stainless steel, with a circular structure, an outer diameter of 400 mm, an inner diameter of 320 mm, and a depth of 80 mm. It has a 25 mm diameter drainage outlet at the bottom and is equipped with a manual ball valve for control. The outer wall of the filter cylinder has eight heat dissipation fins, each rectangular in shape, 400 mm long, 50 mm wide, and 5 mm thick, arranged along the axial direction of the cylinder. The spacing between the fins is one-eighth of the cylinder's circumference, i.e., 117.8 mm. During operation, coffee liquid enters from the top inlet at a flow rate of 5 liters per minute. After being evenly distributed by the water distribution plate, it undergoes progressive filtration through three layers of filter screens, ultimately yielding clean coffee liquid. The entire device is compact, occupies little space, is easy to operate, and provides significant filtration results, making it suitable for the batch production needs of small to medium-sized coffee processing plants.

[0046] The following is another specific embodiment 2 of this utility model: This embodiment is based on Embodiment 1, and the inner wall thread structure of the filter cylinder is optimized and improved. A double-thread design is added to the original right-hand thread, that is, two threads with the same helical angle but starting positions differing by 180 degrees are simultaneously machined on the inner wall of the filter cylinder, forming a double-thread structure. The pitch of the double-thread remains unchanged at 3 mm, but the thread depth of each thread is adjusted to 2 mm, the thread top width is 1.5 mm, and the thread root width is 3 mm, forming a trapezoidal cross-section. Simultaneously, a zoned flow guiding function is added to the design of the water flow distribution plate. Based on the original 12 flow distribution holes, the flow distribution holes are divided into an inner ring of 6 and an outer ring of 6. The diameter of the inner ring flow distribution holes is 6 mm, and the diameter of the outer ring flow distribution holes is 10 mm. The inner and outer ring flow distribution holes are staggered by 30 degrees in the circumferential direction. This improved design allows the coffee liquid to form a stronger rotating flow within the filter cylinder. The double rotation effect generated by the double-thread enhances the turbulence of the liquid and improves the cleaning effect on the surface impurities of the coffee beans. The zoned flow design achieves a differentiated distribution of radial flow velocity. The smaller inner flow channels generate a higher flow velocity, while the larger outer flow channels generate a moderate flow velocity, creating a velocity gradient from the center to the edge, further optimizing the filtration effect. Through these improvements, this embodiment achieves a more thorough cleaning effect when processing the same number of coffee beans, extends the filter's lifespan, and significantly improves overall work efficiency.

[0047] The following is another specific embodiment 3 of this utility model: This embodiment is based on Embodiment 1, and innovatively improves the structure of the multi-layer filter assembly. Based on the original three-layer filter, each layer adopts a composite wave structure design, that is, superimposing smaller-scale secondary waves on the original single wave shape. Specifically, the peak height of the main wave is maintained at 6 mm, the trough depth at 4 mm, and the wavelength at 20 mm. Secondary waves are superimposed on each main wave, with a peak height of 2 mm, a trough depth of 1 mm, and a wavelength at 5 mm. This composite wave structure significantly increases the effective filtration area of ​​the filter and simultaneously forms multi-layered turbulent regions on the filter surface, enhancing the ability to capture impurity particles. Furthermore, a vibration cleaning function is added to the design of the support frame. A small vibrator is installed on each annular support ring, with a vibration frequency set to 50 Hz and a vibration amplitude of 0.5 mm. The vibrator adopts an electromagnetic structure, consisting of a copper coil and a permanent magnet, and generates vibration through alternating current. The vibration cleaning function can be activated periodically, using mechanical vibration to shake off impurities accumulated on the filter screen surface, maintaining the filter's permeability and extending the cleaning cycle. Simultaneously, the drainage collection tank design incorporates a tiered collection function, transforming the original single collection tank into a three-stage system. The first stage collects coarse filtrate, the second stage collects medium filtrate, and the third stage collects fine filtrate. Each stage has an independent drain outlet and control valve, enabling separate collection and treatment of liquids with different cleanliness levels, thus improving the overall precision management of the washing process.

[0048] Specifically, the principle of this invention is as follows: The multi-layer filter assembly adopts a gradient filtration principle. Three layers of filter screens with different mesh diameters decrease in size from top to bottom, achieving a continuous transition from coarse to fine filtration. This avoids the problem of easy clogging of a single filter screen and improves overall filtration accuracy. The water distribution plate is designed based on the theory of uniform fluid distribution. The central inlet receives liquid from above, and the coffee liquid is redistributed to the entire filtration area through evenly distributed diversion holes along the circumference, ensuring that each filter screen area receives the same flow load. The concentric ring-shaped protrusion structure further optimizes the radial distribution of the coffee liquid. The inner and outer ring protrusions of different diameters form a buffer zone, allowing the coffee liquid to diffuse uniformly in the radial direction. The support frame uses radially distributed connecting support rods. Based on structural mechanics principles, the load borne by the filter screen is evenly transferred to the annular support ring. The T-shaped cross-section design increases the bending resistance of the support rods, ensuring the stability of the support system. The sealing ring assembly adopts an O-shaped cross-section design. Based on the principle of elastic sealing, the elastic deformation of the silicone material forms an effective seal between the sealing ring and the inner wall of the filter cylinder, preventing liquid from bypassing the filter screen and flowing out directly. The spiral structure on the inner wall of the filter cartridge is based on the theory of rotational flow, guiding the liquid to form a spiral flow, increasing the liquid residence time and turbulence intensity, improving the washing effect, and preventing impurities from depositing on the filter screen surface. The heat dissipation fin design is based on the principles of heat transfer, promoting heat exchange by increasing the surface area and optimizing the geometry.

Claims

1. A multi-layer filter stacking structure for a coffee washing device, characterized in that, The system includes a filter cylinder, a water distribution plate, a multi-layer filter assembly, a drainage collection tank, a support frame, and a sealing ring assembly. The filter cylinder has a cylindrical structure with an inlet at the top and an outlet at the bottom. The water distribution plate has a circular disc structure and is fixedly installed at the top of the filter cylinder. A central inlet hole is located at the center of the plate, and at least 12 diversion holes are evenly distributed along its circumference. The multi-layer filter assembly includes a first filter layer, a second filter layer, and a third filter layer, which are stacked sequentially along the axial direction of the filter cylinder. The mesh diameter of the first filter layer is 0.8 mm to 1.2 mm, the second filter layer is 0.4 mm to 0.6 mm, and the third filter layer is 0.1 mm to 0.3 mm. The support frame includes an annular support ring and connecting support rods. The inner diameter of the annular support ring matches the inner diameter of the filter cylinder, and the connecting support rods are radially distributed, connecting the center and edge of the annular support ring.

2. The multi-layer filter stacking structure of the coffee washing device according to claim 1, characterized in that, The drainage collection trough has a circular structure and is fixedly installed on the bottom outside of the filter cylinder. The inner wall of the drainage collection trough is connected to the outer wall of the filter cylinder by bolts. The bottom of the drainage collection trough is provided with a drainage outlet, and a control valve is provided at the drainage outlet.

3. The multi-layer filter stacking structure of the coffee washing device according to claim 2, characterized in that, The sealing ring assembly includes an upper sealing ring and a lower sealing ring. The upper sealing ring is located between the water flow distribution plate and the inner wall of the filter cylinder, and the lower sealing ring is located between the third filter screen layer and the inner wall of the filter cylinder. The sealing ring assembly is made of silicone material, and the cross-section of the sealing ring is O-shaped. The outer diameter of the sealing ring is tightly fitted with the inner diameter of the filter cylinder.

4. The multi-layer filter stacking structure of the coffee washing device according to claim 3, characterized in that, The annular support rings of the support frame are respectively set between the first filter layer and the second filter layer and between the second filter layer and the third filter layer. There are 6 connecting support rods, which are evenly distributed on the annular support rings at a 60-degree angle. The cross-section of the connecting support rods is T-shaped.

5. The multi-layer filter stacking structure of the coffee washing device according to claim 4, characterized in that, The inner wall of the filter cylinder is provided with a threaded structure. The pitch of the threaded structure is 2 mm to 4 mm and the thread depth is 1 mm to 2 mm. The threaded structure is used to guide the water flow to form a rotating flow state.

6. The multi-layer filter stacking structure of the coffee washing device according to claim 5, characterized in that, The upper surface of the water distribution plate is provided with a concentric annular protrusion structure, which includes an inner ring protrusion and an outer ring protrusion. The diameter of the inner ring protrusion is one-third of the diameter of the water distribution plate, and the diameter of the outer ring protrusion is two-thirds of the diameter of the water distribution plate. The protrusion height is 3 mm to 5 mm.

7. The multi-layer filter stacking structure of the coffee washing device according to claim 6, characterized in that, The outer wall of the filter cylinder is provided with multiple heat dissipation fins, which are rectangular in shape and are arranged along the axial direction of the filter cylinder.

8. The multi-layer filter stacking structure of the coffee washing device according to claim 7, characterized in that, The filter layers of the multi-layer filter assembly all have a wavy structure, with the peak height of the wavy structure ranging from 5 mm to 8 mm and the trough depth ranging from 3 mm to 5 mm.

9. The multi-layer filter stacking structure of the coffee washing device according to claim 8, characterized in that, The inner wall of the drainage collection trough is provided with a serrated groove structure, with a tooth height of 2 mm to 4 mm and a tooth width of 3 mm to 6 mm.

10. The multi-layer filter stacking structure of the coffee washing device according to claim 9, characterized in that, The number of heat dissipation fins is at least 8. Multiple heat dissipation fins are equidistantly distributed along the circumference on the outer wall of the filter cylinder. The distance between adjacent heat dissipation fins is one-eighth of the circumference of the filter cylinder.

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