A tea leaf fixation machine waste heat recycling device

Abstract

The utility model belongs to the technical field of tea leaf fixation machine, especially relate to a tea leaf fixation machine waste heat recycling device, including the heat preservation box, the inner chamber left side of heat preservation box is provided with the filter box, the right side of filter box is provided with a plurality of vertical distribution's waste heat recovery tank, fixedly connected with the shunt pipe between filter box and a plurality of waste heat recovery tank, the left side wall of filter box is fixed with the tail gas import in the lower part department department, through the collaborative structure design of "front filter + high -efficient heat transfer", effectively solved the traditional tea leaf fixation machine high temperature tail gas contains the technical pain point that the impurity oil easily blocks the heat exchange component, and the waste heat direct discharge causes the energy waste, through "on -line cleaning + convenient set pollution" maintenance structure design, solved the traditional filter component after blocking need to stop the maintenance structure design, the technical pain point that the maintenance cost is high, the influence production continuity that the impurity oil collection is inconvenient leads to.

Description

Technical Field

[0001] This utility model belongs to the technical field of tea fixing machine, and in particular relates to a waste heat recovery and utilization device for tea fixing machine. Background Technology

[0002] Tea fixation is a core step in tea processing. Its purpose is to deactivate enzymes in fresh leaves through high temperatures, inhibiting the oxidation of substances such as tea polyphenols, thereby fixing the quality of the tea and preserving its aroma. During fixation, the tea fixation machine continuously outputs high-temperature energy, generating a large amount of exhaust gas at temperatures between 150-300℃. This exhaust gas not only carries considerable waste heat resources but also contains tea fragments, dust particles, and oils released from the tea leaves due to direct contact with them. Currently, the industry's approach to treating the exhaust gas from fixation machines is rather crude. In most cases, the exhaust gas is directly discharged into the environment, resulting in a serious waste of waste heat resources and potential pollution of the surrounding environment due to the diffusion of impurities and oils in the exhaust gas. Even the few devices equipped with waste heat recovery functions often lack targeted pretreatment of the exhaust gas, making it difficult to achieve coordinated waste heat recovery and exhaust gas purification, thus requiring improvement in overall energy utilization and environmental friendliness.

[0003] In practical production applications, existing technologies for exhaust gas treatment and waste heat recovery from tea fixing machines have significant drawbacks: On the one hand, due to the lack of an effective pre-filtration structure for the exhaust gas, tea fragments, dust, and grease in the fixing exhaust gas directly enter the heat exchange components (such as heat exchange pipes and recovery boxes) for waste heat recovery. This not only easily causes pipe blockage, preventing the waste heat recovery system from operating normally, but also significantly reduces the heat transfer efficiency of the pipes due to grease adhering to the inner walls, greatly diminishing the waste heat recovery effect. Operators need to frequently disassemble and clean the heat exchange components, increasing maintenance costs and affecting production progress. On the other hand, existing filter components are mostly fixedly installed. When excessive impurities and grease adhere to the filter surface, causing a decrease in filtration efficiency, the machine must be stopped for disassembly, cleaning, or replacement. This severely interrupts the continuous production process of tea fixing, reduces overall production efficiency, and makes it difficult to meet the production needs of tea processing. Therefore, we propose a waste heat recovery and utilization device for tea fixing machines. Utility Model Content

[0004] The purpose of this utility model is to provide a waste heat recovery and utilization device for tea fixing machines to solve the problems mentioned in the background art.

[0005] In view of this, the present invention provides a waste heat recovery and utilization device for a tea fixing machine, comprising:

[0006] The insulated box has a filter box on the left side of its inner cavity and multiple vertically distributed waste heat recovery boxes on the right side of the filter box. A diversion pipe is fixedly connected between the filter box and the multiple waste heat recovery boxes. An exhaust gas inlet is fixed at the lower part of the left side wall of the filter box, and the other end of the exhaust gas inlet passes through the insulated box and extends to the outside. An S-shaped pipe is fixed inside the waste heat recovery box, and a U-shaped pipe is fixed between the S-shaped pipes in two adjacent waste heat recovery boxes. The uppermost S-shaped pipe extends to the outside at the hot water outlet, and the lowermost S-shaped pipe extends to the outside at the cold water inlet.

[0007] The filtration mechanism is installed inside the filter box and is used to filter impurities and oils in the exhaust gas from the tea processing.

[0008] Preferably, the space between two adjacent waste heat recovery boxes is filled with a box insulation board, which is a modified waterproof high-density rock wool insulation board.

[0009] Preferably, the right side wall of the waste heat recovery box is provided with an exhaust port, and a grid is fixed inside the exhaust port by bolts. The right side wall of the insulation box is provided with adapter holes that match multiple grids.

[0010] Preferably, a settling hopper is fixed on the lower surface of the filter box. The settling hopper has a bucket-shaped structure and a discharge valve is provided at the bottom end of the settling hopper. A through hole is provided on the lower surface of the insulation box to accommodate the settling hopper.

[0011] Preferably, the filtration mechanism includes:

[0012] A filter plate is snapped into the inner cavity of the filter box. The filter plate has ventilation holes and is positioned above the exhaust gas inlet. A cleaning assembly is located above the filter plate.

[0013] Preferably, the cleaning assembly includes:

[0014] A stepper motor is fixedly installed at the middle position of the upper surface of the filter box. A transmission rod coaxially connected to the output shaft of the stepper motor is rotatably installed in the inner cavity of the filter box. A brush plate is fixedly installed at the bottom end of the transmission rod, and the brush part on the lower surface of the brush plate is in contact with the filter plate.

[0015] Preferably, the cleaning assembly further includes:

[0016] Two liquid storage tanks are symmetrically and fixedly installed on the upper surface of the filter box. A booster water pump is fixedly installed inside each liquid storage tank. A liquid delivery pipe is fixedly installed at the output end of the booster water pump. A horizontal pipe is fixedly installed at the bottom end of the liquid delivery pipe. Multiple high-pressure atomizing nozzles distributed linearly and equally spaced are fixedly installed on the horizontal pipe. An injection port is provided on the upper surface of the liquid storage tank, and the other end of the injection port passes through the insulation box and extends to the outside.

[0017] Preferably, multiple high-pressure atomizing nozzles on one of the horizontal pipes are arranged to spray downwards at an angle, and the liquid storage tank connected to the horizontal pipe is filled with clean water; multiple high-pressure atomizing nozzles on the other horizontal pipe are arranged to spray upwards at an angle, and the liquid storage tank connected to the other horizontal pipe is filled with cleaning fluid.

[0018] The beneficial effects of this utility model are:

[0019] 1. This waste heat recovery and utilization device for tea fixing machines effectively solves the technical pain points of traditional tea fixing machines, such as the high-temperature exhaust gas containing impurities and grease easily clogging heat exchange components, and the direct discharge of waste heat causing energy waste, through a synergistic structural design of "pre-filtration + high-efficiency heat exchange". It first intercepts tea fragments, dust, and grease in the exhaust gas through filter plates in the filter box, preventing impurities from clogging the diversion pipe and S-shaped pipe, and preventing grease from affecting heat exchange efficiency. Then, it uses vertically distributed waste heat recovery boxes to extend the residence time of the exhaust gas, and in conjunction with S-shaped pipes to increase the heat exchange contact area and U-shaped pipes to achieve continuous heat absorption by the water, converting the waste heat into hot water that can be used for subsequent tea washing and drying. At the same time, the insulation panels between the boxes reduce heat loss, significantly improving the waste heat recovery and utilization rate and reducing energy consumption.

[0020] 2. This waste heat recovery and utilization device for tea processing machines solves the technical pain points of traditional filter components that require machine shutdown for disassembly and cleaning after clogging, and the high maintenance costs and disruption to production continuity caused by inconvenient collection of impurities and grease, through its "online cleaning + convenient sludge collection" maintenance structure design. Its cleaning component uses a stepper motor to drive a brush plate to scrub the filter plates, combined with upward-sloping cleaning liquid nozzles for secondary purification of exhaust gas and cleaning of the inner walls, and downward-sloping clean water nozzles to rinse away residues, achieving online cleaning of the filter plates without stopping the machine. Simultaneously, the bucket-shaped settling hopper below the filter box can collect impurities and grease, which can be cleaned periodically by opening the discharge valve, significantly reducing maintenance difficulty, minimizing downtime, and ensuring long-term continuous and stable operation of the device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram showing the internal structure of the insulated box in this utility model;

[0023] Figure 3This is a schematic diagram of the waste heat recovery mechanism in this utility model;

[0024] Figure 4 This is a schematic diagram of the overall structure of the filtration mechanism in this utility model;

[0025] Figure 5 This is a schematic diagram showing the internal structure of the filter box in this utility model.

[0026] The markings in the diagram are as follows:

[0027] 1. Insulation box; 2. Filter box; 3. Waste heat recovery box; 4. Diverter pipe; 5. Exhaust gas inlet; 6. S-shaped pipe; 7. U-shaped pipe; 8. Insulation board between boxes; 9. Exhaust port; 10. Grille; 11. Settling hopper; 12. Filter plate; 13. Stepper motor; 14. Transmission rod; 15. Brush plate; 16. Liquid storage tank; 17. Booster pump; 18. Liquid delivery pipe; 19. Horizontal pipe; 20. High-pressure atomizing nozzle; 21. Liquid injection port. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 - Figure 5 This application will be described in further detail.

[0029] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0030] Example 1:

[0031] This embodiment provides a waste heat recovery and utilization device for a tea fixing machine, including:

[0032] The heat preservation box 1 has a filter box 2 on the left side of its inner cavity and multiple vertically distributed waste heat recovery boxes 3 on the right side of the filter box 2. A diversion pipe 4 is fixedly connected between the filter box 2 and the multiple waste heat recovery boxes 3. An exhaust gas inlet 5 is fixed at the lower part of the left side wall of the filter box 2, and the other end of the exhaust gas inlet 5 passes through the heat preservation box 1 and extends to the outside. An S-shaped pipe 6 is fixed inside the waste heat recovery box 3. A U-shaped pipe 7 is fixed between the S-shaped pipes 6 in two adjacent waste heat recovery boxes 3. The end of the uppermost S-shaped pipe 6 that extends to the outside is the hot water outlet, and the end of the lowermost S-shaped pipe 6 that extends to the outside is the cold water inlet.

[0033] The filtration mechanism is installed inside the filter box 2 and is used to filter impurities and oils in the exhaust gas from the tea processing.

[0034] A heat insulation plate can be installed between the filter box 2 and multiple waste heat recovery boxes 3, thereby dividing the inner cavity of the heat insulation box 1 into an exhaust gas filtration chamber and a waste heat recovery chamber.

[0035] Among these, the design of the exhaust gas inlet and heat exchange path, which is the core of the device, must prioritize ensuring the compatibility between the exhaust gas inlet 5 and the exhaust gas outlet of the tea fixing machine. The pipe diameter of the exhaust gas inlet 5 must be perfectly matched with the exhaust gas outlet of the fixing machine to avoid exhaust gas leakage at the connection point, thus preventing heat waste and environmental pollution. From the perspective of actual operation logic, after the exhaust gas enters the filter box 2 from the exhaust gas inlet 5, it must first pass through the filtration mechanism. This is because the tea leaves, dust, and grease mixed in the fixing exhaust gas can easily cause blockage of the diversion pipe 4 or adhere to the inner wall of the S-shaped pipe 6 if they directly enter the diversion pipe 4 and the waste heat recovery box 3, affecting heat transfer. Therefore, the pre-positioning design of the filtration mechanism is the key to ensuring the efficiency of subsequent waste heat recovery.

[0036] In terms of waste heat recovery structure design, multiple waste heat recovery boxes 3 are vertically distributed, which can significantly extend the residence time of exhaust gas in the insulation box 1, providing sufficient time for heat exchange. At the same time, the S-shaped tube 6 adopts an S-shaped structure, which can maximize the contact area with the exhaust gas in the waste heat recovery box 3. Combined with the connection effect of the U-shaped tube 7 to the adjacent S-shaped tubes 6, the cool water enters from the bottom S-shaped tube 6 and can gradually flow along the S-shaped tubes 6 in multiple waste heat recovery boxes 3, gradually absorbing heat, and finally discharged from the top S-shaped tube 6 as hot water. The discharged hot water can be directly used for subsequent tea washing, drying and other processes, realizing the efficient reuse of waste heat.

[0037] In addition, the heat insulation plate between the filter box 2 and the multiple waste heat recovery boxes 3 is indispensable. Its function is to strictly separate the exhaust gas filtration chamber and the waste heat recovery chamber, prevent the exhaust gas containing impurities that is not fully filtered from entering the waste heat recovery chamber, and at the same time prevent the heat in the waste heat recovery chamber from being lost to the filtration chamber. As the main body of heat preservation, the insulation box 1 can be lined with an additional layer of heat insulation cotton on its inner wall to further reduce the loss of internal heat to the external environment, ensure the temperature of the waste heat recovery chamber is stable, and improve the energy utilization efficiency of the overall device.

[0038] Example 2:

[0039] This embodiment provides a waste heat recovery and utilization device for a tea processing machine. In addition to the technical solution of the above embodiment, it also has the following technical features: a heat insulation board 8 is filled between two adjacent waste heat recovery boxes 3, and the heat insulation board 8 is a modified waterproof high-density rock wool insulation board.

[0040] From the perspective of heat loss control, if the gap between adjacent waste heat recovery boxes 3 is not addressed, heat from the high-temperature exhaust gas in waste heat recovery box 3 will be transferred to the inner wall of the adjacent waste heat recovery box 3 or the insulation box 1. Especially when the exhaust gas in the lower waste heat recovery box 3 cools down after heat exchange, it will absorb heat from the high-temperature exhaust gas in the upper waste heat recovery box 3, severely affecting heat exchange and insulation efficiency. Therefore, the filling of the insulation board 8 between the boxes is a necessary design. The modified waterproof high-density rock wool insulation board used has excellent thermal insulation performance due to its high-density structure, which can effectively block the heat transfer between adjacent waste heat recovery boxes 3, ensuring a stable heat exchange temperature difference in each waste heat recovery box 3 and ensuring uniform heat absorption of the water in the S-shaped pipe 6.

[0041] Meanwhile, considering the actual operating environment of the device—the blanching exhaust gas contains a certain amount of moisture, and liquid splashing may occur during the cleaning of the components—the modified waterproof properties of the inter-box insulation board 8 can prevent moisture or liquid from penetrating the interior, avoiding a decrease in insulation performance or corrosion damage due to moisture, thus extending its service life. In terms of installation details, the filling thickness of the inter-box insulation board 8 must be precisely matched to the height of the waste heat recovery box 3, ensuring complete filling of the gaps between adjacent waste heat recovery boxes 3. After filling, the outer surface of the inter-box insulation board 8 should not exceed the outer contour of the waste heat recovery box 3, avoiding interference with the inner wall of the insulation box 1 and ensuring the installation stability of the waste heat recovery box 3 within the insulation box 1. Furthermore, the inter-box insulation board 8 must be tightly fitted to the outer wall of the waste heat recovery box 3 and the inner wall of the insulation box 1, achieving gap sealing through compression fixation, further reducing heat loss from the gaps, and creating a relatively sealed insulation space for the entire waste heat recovery chamber.

[0042] Example 3:

[0043] This embodiment provides a waste heat recovery and utilization device for a tea fixing machine. In addition to the technical solution of the above embodiment, it also has the following technical features: the right side wall of the waste heat recovery box 3 is provided with an exhaust port 9, and a grid 10 is fixed in the exhaust port 9 by bolts. The right side wall of the heat preservation box 1 is provided with an adapter hole that matches multiple grids 10.

[0044] The low-temperature exhaust gas that has completed heat exchange within the waste heat recovery box 3 needs to be discharged smoothly. Therefore, the location of the exhaust port 9 is crucial. Choosing it in the middle of the right side wall of the waste heat recovery box 3 ensures that the exhaust gas is discharged evenly from the center of the cavity, avoiding any stagnant areas and ensuring smooth gas flow, thus maintaining the continuity of the heat exchange process. The grille 10 is fixed to the exhaust port 9 with bolts. Its grille structure design must consider two points: firstly, allowing the low-temperature exhaust gas to pass smoothly; and secondly, preventing external debris (such as dust, leaves, and insects) from entering the waste heat recovery box 3, thus preventing debris from clogging the S-shaped pipe 6 or adhering to the inner wall of the waste heat recovery box 3, affecting subsequent heat exchange efficiency.

[0045] From a maintenance convenience perspective, the bolted connection method facilitates the disassembly and replacement of the grille 10. When the grille 10 becomes clogged or structurally damaged after long-term use, operators do not need to disassemble the entire waste heat recovery box 3; they can simply unscrew the bolts to remove the grille 10 for cleaning or replacement, reducing maintenance costs and operational difficulty. The adapter hole on the right side wall of the insulation box 1 must be sized exactly to match the shape of the grille 10, ensuring that the outer end of the grille 10 can extend through the adapter hole to the outside of the insulation box 1. This ensures unobstructed exhaust gas path and prevents exhaust gas leakage through gaps via the transition fit between the adapter hole and the outer wall of the grille 10. This avoids condensation of moisture in the low-temperature exhaust gas inside the insulation box 1, which could cause component corrosion, or allow outside air to enter and affect the insulation effect of the insulation box 1. Furthermore, each waste heat recovery box 3 corresponds to one exhaust port 9 and grille 10, ensuring that exhaust gas from each waste heat recovery box 3 is discharged independently, avoiding exhaust problems caused by sharing an exhaust channel.

[0046] Example 4:

[0047] This embodiment provides a waste heat recovery and utilization device for a tea fixing machine. In addition to the technical solution of the above embodiment, it also has the following technical features: a settling hopper 11 is fixed on the lower surface of the filter box 2. The settling hopper 11 has a bucket-shaped structure. A discharge valve is provided at the bottom of the settling hopper 11. A through hole is provided on the lower surface of the heat preservation box 1 to accommodate the settling hopper 11.

[0048] In the filter box 2, when the filtration mechanism intercepts impurities and grease, some solid impurities will settle due to gravity, and liquid grease will also flow downwards with gravity. If not collected in time, they can easily accumulate at the bottom of the filter box 2, causing blockage of the inner cavity, or leak from the gap between the filter box 2 and the insulation box 1, contaminating the internal components. Therefore, the bucket-shaped structure design of the settling hopper 11 is highly targeted—its large-diameter end is completely fitted and fixed to the lower surface of the filter box 2, which can maximize the collection of settled impurities and grease, and the inner wall is made of a polished smooth surface to reduce the adhesion of impurities and grease to the wall surface, ensuring that they slide smoothly down the inner wall to the bottom of the settling hopper 11.

[0049] From a daily operation perspective, the discharge valve (manual or electric shut-off valve) at the bottom of the settling hopper 11 allows operators to open it at any time based on the amount collected in the settling hopper 11 (judged through a transparent observation window or weighing sensor) to discharge impurities and grease into a preset container without disassembling the filter box 2 or the settling hopper 11, thus not affecting the normal operation of the device. The through-hole on the lower surface of the insulation box 1 needs to be slightly larger than the outer diameter of the settling hopper 11 to ensure that the settling hopper 11 can smoothly pass through and extend to the outside of the insulation box 1. This avoids the settling hopper 11 being completely inside the insulation box 1, which would cause inconvenience in discharge, and also prevents the discharged impurities and grease from causing secondary pollution inside the insulation box 1. Furthermore, the settling hopper 11 and the lower surface of the filter box 2 are sealed by welding or bolts to ensure the airtightness of the connection and prevent impurities and grease from leaking through gaps into other components inside the insulation box 1 (such as the waste heat recovery box 3 and the S-shaped pipe 6).

[0050] Example 5:

[0051] This embodiment provides a waste heat recovery and utilization device for a tea fixing machine. In addition to the technical solutions of the above embodiments, it also has the following technical features: the filtration mechanism includes:

[0052] The filter plate 12 is snapped into the inner cavity of the filter box 2. The filter plate 12 has air vents and is positioned above the exhaust gas inlet 5. A cleaning assembly is provided above the filter plate 12.

[0053] Among them, the filter plate 12 is the core of the filtration mechanism. Its position is designed above the exhaust gas inlet 5 so that the exhaust gas entering from the exhaust gas inlet 5 must flow through the filter plate 12. The pore size of the air vents on the filter plate 12 (usually 0.1-0.5mm) can intercept solid impurities, and the metal filter screen or composite fiber material used has the ability to adsorb grease, which can effectively prevent impurities and grease from entering the diversion pipe 4 and the waste heat recovery box 3, ensuring the smooth flow and efficiency of the subsequent heat exchange structure.

[0054] From the perspective of ease of maintenance, the snap-fit ​​installation method of filter plate 12 (the inner wall of filter box 2 is provided with a slot, and the edge of filter plate 12 is provided with an appropriate snap block, which is fixed by interference fit) does not require bolts or other connecting parts. Operators can directly take the filter plate 12 out of or put it into the filter box 2. When the filter plate 12 is clogged or grease adsorption causes the filtration performance to decline, it can be quickly disassembled for ultrasonic cleaning or replacement, reducing maintenance difficulty and downtime.

[0055] Furthermore, the cleaning component above the filter plate 12 is designed to achieve "online cleaning"—when a small amount of impurities or grease adheres to the surface of the filter plate 12 but does not require disassembly, it can be cleaned in situ by the cleaning component, restoring the air permeability and filtration performance of the filter plate 12, and avoiding frequent disassembly that would affect the continuous operation of the device. At the same time, the installation height of the filter plate 12 must be precisely matched with the exhaust gas inlet 5 to ensure that all exhaust gas flows through the filtration area of ​​the filter plate 12, preventing exhaust gas from bypassing the gap between the filter plate 12 and the inner wall of the filter box 2, thus avoiding filtration failure. Moreover, the material of the filter plate 12 must be selected to be high-temperature resistant (150-300℃, suitable for the temperature of the blanching exhaust gas) and corrosion-resistant (resistant to tea oil corrosion), such as 304 stainless steel filter mesh or polytetrafluoroethylene composite filter mesh, to ensure long-term stable operation.

[0056] Example 6:

[0057] This embodiment provides a waste heat recovery and utilization device for a tea fixing machine. In addition to the technical solutions of the above embodiments, it also has the following technical features: the cleaning component includes:

[0058] A stepper motor 13 is fixedly installed at the middle position of the upper surface of the filter box 2. A transmission rod 14 coaxially connected to the output shaft of the stepper motor 13 is rotatably installed in the inner cavity of the filter box 2. A brush plate 15 is fixedly installed at the bottom end of the transmission rod 14. The brush part on the lower surface of the brush plate 15 is in contact with the filter plate 12.

[0059] The stepper motor 13, serving as the power source for the cleaning assembly, is fixed in the center of the upper surface of the filter box 2. Its installation position must ensure that the output shaft is vertically aligned with the center of the filter box 2's inner cavity to prevent the transmission rod 14 from rotating eccentrically. Considering power stability and controllability, a stepper motor is selected—its speed is adjustable (typically 50-150 r / min), and its rotation angle is precise. Operators can adjust the speed and direction of rotation (alternating between forward and reverse rotation) via the controller according to the amount of impurities and grease adhering to the filter plate 12's surface, ensuring cleaning effectiveness while preventing damage to the filter plate 12 from excessive speed.

[0060] The design of the transmission rod 14 needs to consider both connection and sealing. The upper end is fixed coaxially with the output shaft of the stepper motor 13 via a coupling, and the lower end extends into the inner cavity of the filter box 2 and connects with the brush plate 15. The length needs to be adapted to the height of the inner cavity of the filter box 2 to ensure that the brush part of the brush plate 15 is in close contact with the upper surface of the filter plate 12, and does not interfere with the inner wall of the filter box 2, the liquid storage tank 16, or the exhaust gas inlet 5 when rotating. At the same time, a sealed bearing is set at the rotating connection between the transmission rod 14 and the upper surface of the filter box 2 to ensure smooth rotation of the transmission rod 14 and prevent exhaust gas from leaking from the connection in the filter box 2, thus maintaining the airtightness of the filter box 2.

[0061] The structural design of the brush plate 15 directly affects the cleaning effect. Its diameter is adapted to the filter plate 12 to ensure that the brush part completely covers the upper surface of the filter plate 12, eliminating cleaning dead corners. The filter plate 12 can be a square structure, with its upper vent holes located within the rotation range of the brush plate 15. The brush part uses high-temperature resistant and wear-resistant nylon bristles. The bristle length (5-10mm) and density (50-100 bristles per square centimeter) are optimized. The bristle length needs to be able to penetrate deep into the vent holes of the filter plate 12 to remove blockages, and the density needs to ensure uniform brushing pressure to avoid damaging the filter material of the filter plate 12. In addition, reinforcing ribs can be set on the upper surface of the brush plate 15 to enhance structural strength and prevent deformation due to centrifugal force during high-speed rotation, ensuring stable contact pressure between the brush part and the filter plate 12.

[0062] Example 7:

[0063] This embodiment provides a waste heat recovery and utilization device for a tea fixing machine. In addition to the technical solutions of the above embodiments, it also has the following technical features: the cleaning component further includes:

[0064] Two liquid storage tanks 16 are symmetrically fixedly installed on the upper surface of the filter box 2. A booster water pump 17 is fixedly installed inside the liquid storage tank 16. A liquid delivery pipe 18 is fixedly installed at the output end of the booster water pump 17. A horizontal pipe 19 is fixedly installed at the bottom end of the liquid delivery pipe 18. Multiple high-pressure atomizing nozzles 20 are fixedly installed on the horizontal pipe 19 in a linear and equidistant manner. An injection port 21 is provided on the upper surface of the liquid storage tank 16, and the other end of the injection port 21 passes through the heat preservation box 1 and extends to the outside.

[0065] Two liquid storage tanks 16 are symmetrically fixed on the upper surface of the filter box 2, storing clean water and cleaning solution respectively. The symmetrical distribution ensures that the liquid is evenly sprayed on the surface of the filter plate 12 during cleaning, avoiding uneven cleaning caused by spraying on one side. Considering the practicality of liquid storage, the volume of the liquid storage tank 16 (usually 5-10L) needs to be designed according to the operation cycle and cleaning frequency of the device to ensure that frequent liquid replenishment is not required for each cleaning, reducing operation interruptions.

[0066] The booster pump 17, as a liquid pressurization component, is fixed at the bottom of the inside of the liquid storage tank 16. The booster pump (rated pressure 0.3-0.5MPa, rated flow 1-2L / min) is selected. Its function is to pressurize the liquid in the liquid storage tank 16 to the preset pressure, ensuring that the liquid sprayed by the high-pressure atomizing nozzle 20 has sufficient impact force to effectively remove stubborn stains on the surface of the filter plate 12. In addition, the water inlet of the booster pump 17 extends to the bottom of the liquid storage tank 16, which can fully extract the liquid and reduce residue.

[0067] The coordination between the liquid delivery pipe 18, the horizontal pipe 19, and the high-pressure atomizing nozzle 20 must ensure the liquid delivery and spraying effect. The liquid delivery pipe 18 is made of high-temperature and corrosion-resistant polytetrafluoroethylene or stainless steel. One end is threaded and sealed to the output end of the booster pump 17, and the other end extends through the upper surface of the filter box 2 (with a sealing ring at the penetration point to prevent exhaust gas leakage) and into the inner cavity to be fixed to the horizontal pipe 19. The horizontal pipe 19 is horizontally fixed at the bottom end of the liquid delivery pipe 18, and its length is consistent with that of the filter plate 12, ensuring that multiple high-pressure atomizing nozzles 20 cover the width of the filter plate 12. The high-pressure atomizing nozzle 20 atomizes the liquid into 50-100μm mist particles, which increases the contact area with the surface of the filter plate 12 and avoids excessive liquid accumulation on the filter plate 12, which would affect the passage of exhaust gas. Multiple high-pressure atomizing nozzles 20 are linearly and equally spaced (2-5cm apart) to ensure uniform spraying without dead corners.

[0068] The injection port 21 serves as the injection channel, located on the upper surface of the storage tank 16 and extending through the insulation box 1 to the outside. Operators can replenish liquid through the injection port 21 without disassembling the insulation box 1 or the filter box 2. Furthermore, a sealing cap is provided at the top of the injection port 21 to prevent external debris from contaminating the liquid inside the storage tank 16. In addition, the horizontal pipe 19 and the delivery pipe 18 are connected by a threaded detachable connection, allowing for quick disassembly and replacement when the high-pressure atomizing nozzle 20 is clogged or damaged, reducing maintenance costs.

[0069] Example 8:

[0070] This embodiment provides a waste heat recovery and utilization device for a tea fixing machine. In addition to the technical solution of the above embodiment, it also has the following technical features: multiple high-pressure atomizing nozzles 20 on one horizontal pipe 19 are arranged to spray downwards at an angle, and the liquid storage tank 16 connected to it is filled with clean water; multiple high-pressure atomizing nozzles 20 on another horizontal pipe 19 are arranged to spray upwards at an angle, and the liquid storage tank 16 connected to it is filled with cleaning liquid.

[0071] The design of the two high-pressure atomizing nozzles 20, including their spray direction and liquid type, aims to create a synergistic cleaning mode of "purification + rinsing." First, deep purification is achieved through the cleaning liquid, followed by rinsing and residue removal with clean water. For nozzle 19, which contains cleaning liquid (such as a 0.5%-1% concentration of food-grade alkaline cleaning agent), the nozzle 20 sprays upwards at an angle of 30°-45° to the horizontal. This angle allows the atomized cleaning liquid to contact the upward-flowing exhaust gas in the opposite direction, extending the contact time and fully dissolving any grease not filtered by the filter plate 12, achieving secondary purification of the exhaust gas and further reducing the risk of grease entering the diversion pipe 4 and the waste heat recovery box 3. Furthermore, the upward-sloping cleaning liquid covers the upper part of the filter box 2's inner cavity, cleaning the inner wall of the filter box 2 and the brush part of the brush plate 15, preventing grease from adhering and solidifying in these areas, thus avoiding contamination of the filter plate 12. The air inlet of the diversion pipe 4 can be located slightly above the filter box 2 and is angled to prevent the cleaning liquid from entering the inner cavity of the diversion pipe 4.

[0072] For the horizontal pipe 19 containing clean water, its high-pressure atomizing nozzle 20 sprays water at an angle of 45°-60° to the horizontal direction. This angle allows the atomized clean water to be accurately sprayed onto the upper surface of the filter plate 12 and the brush part of the brush plate 15. On the one hand, it washes away the impurity particles scraped off by the brush part, allowing them to enter the settling hopper 11 with the water flow for collection, preventing impurities from re-accumulating and clogging the air vents of the filter plate 12. On the other hand, it dilutes the residual cleaning liquid on the surface of the filter plate 12, preventing the cleaning liquid from adhering to and corroding the filter plate 12 (especially the metal filter material) for a long time, while washing away the fine impurities in the air vents to ensure that the air vents are completely unobstructed.

[0073] In terms of operation and control, the output pressure of the two booster pumps 17 can be adjusted separately—the pressure of the booster pump 17 on the cleaning liquid side is set to 0.4-0.5 MPa to ensure the dissolution capacity of the cleaning liquid droplets; the pressure of the booster pump 17 on the clean water side is set to 0.3-0.4 MPa to balance the rinsing effect and the protection of the filter plate 12. Furthermore, the starting sequence of the booster pumps 17 can be preset by the controller: first start the booster pump 17 on the cleaning liquid side for 1-2 minutes (adjusted according to the oil content of the exhaust gas), then start the booster pump 17 on the clean water side for 2-3 minutes; after cleaning, keep the stepper motor 13 running for 1-2 minutes to dry the surface moisture of the filter plate 12 using the brush part of the brush plate 15, avoiding affecting the exhaust gas passage efficiency. This design ensures both cleaning effect and avoids the impact of cleaning liquid residue on the hygiene of tea processing.

[0074] Working principle: When the waste heat recovery and utilization device of this tea fixing machine is running, the high-temperature exhaust gas generated by the tea fixing machine is first introduced into the filter box 2 through the exhaust gas inlet 5. The exhaust gas first flows through the filter plate 12 in the filter box 2. The filter plate 12 intercepts solid impurities such as tea fragments and dust in the exhaust gas through the air vents, and adsorbs some oil, so as to achieve preliminary purification of the exhaust gas and avoid impurities and oil affecting the subsequent waste heat recovery components.

[0075] The purified high-temperature exhaust gas is evenly distributed into multiple vertically distributed waste heat recovery boxes 3 through the diversion pipe 4. Simultaneously, cool water is injected from the cool water inlet of the S-shaped pipe 6 in the lowest waste heat recovery box 3. With the connection of the U-shaped pipe 7, the cool water flows upwards sequentially along the S-shaped pipes 6 in the multiple waste heat recovery boxes 3. During this process, the S-shaped pipe 6 increases the contact area with the high-temperature exhaust gas, efficiently absorbing heat from the exhaust gas, causing the cool water inside the pipe to gradually heat up. Finally, it is discharged from the hot water outlet of the uppermost S-shaped pipe 6, for use in subsequent tea washing and drying processes, thus completing the waste heat recovery. The heat insulation board 8 between adjacent waste heat recovery boxes 3 reduces heat loss and ensures heat exchange efficiency.

[0076] The low-temperature exhaust gas after waste heat release is discharged through the grille 10 inside the exhaust port 9 on the right side wall of the waste heat recovery box 3. The grille 10 can prevent external debris from entering the waste heat recovery box 3. When impurities and grease accumulate on the surface of the filter plate 12 and affect the filtration effect, the cleaning component is activated: the stepper motor 13 drives the transmission rod 14 and the brush plate 15 to rotate, and the brush part on the lower surface of the brush plate 15 brushes the filter plate 12. At the same time, the booster water pump 17 in the liquid storage tank 16 containing the cleaning liquid delivers the cleaning liquid through the liquid delivery pipe 18 and the horizontal pipe 19 to the inclined plate. The upward-facing high-pressure atomizing nozzle 20 atomizes the cleaning liquid and brings it into counter-current contact with the exhaust gas, thus purifying the exhaust gas and cleaning the inner wall of the filter box 2 and the brush plate 15. Subsequently, the booster water pump 17 in the water storage tank 16 delivers clean water to the downward-facing high-pressure atomizing nozzle 20 to rinse away the residual cleaning liquid and impurities on the surface of the filter plate 12. The impurities and grease generated during cleaning fall into the settling hopper 11 below the filter box 2 under gravity. The discharge valve at the bottom of the settling hopper 11 can be opened periodically to discharge the impurities and grease, ensuring the continuous and stable operation of the device.

[0077] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A waste heat recovery and utilization device for a tea fixing machine, characterized in that, include: A heat preservation box (1) is provided with a filter box (2) on the left side of the inner cavity of the heat preservation box (1). Multiple waste heat recovery boxes (3) are arranged vertically on the right side of the filter box (2). A diversion pipe (4) is fixedly connected between the filter box (2) and the multiple waste heat recovery boxes (3). A tail gas inlet (5) is fixed at the lower part of the left side wall of the filter box (2). The other end of the tail gas inlet (5) passes through the heat preservation box (1) and extends to the outside. An S-shaped pipe (6) is fixed inside the waste heat recovery box (3). A U-shaped pipe (7) is fixed between the S-shaped pipes (6) in two adjacent waste heat recovery boxes (3). The uppermost S-shaped pipe (6) extends to the outside as a hot water outlet, and the lowermost S-shaped pipe (6) extends to the outside as a cold water inlet. The filtration mechanism is installed inside the filter box (2) and is used to filter impurities and oils in the exhaust gas of tea leaves during the blanching process.

2. The waste heat recovery and utilization device for a tea fixing machine according to claim 1, characterized in that, The space between two adjacent waste heat recovery boxes (3) is filled with a box insulation board (8), which is a modified waterproof high-density rock wool insulation board.

3. The waste heat recovery and utilization device for a tea fixing machine according to claim 1, characterized in that, The waste heat recovery box (3) has an exhaust port (9) on its right side wall. A grid (10) is fixed inside the exhaust port (9) by bolts. The insulation box (1) has an adapter hole on its right side wall that matches the multiple grids (10).

4. The waste heat recovery and utilization device for a tea fixing machine according to claim 1, characterized in that, The filter box (2) has a settling hopper (11) fixed on its lower surface. The settling hopper (11) has a bucket-shaped structure. The bottom end of the settling hopper (11) is provided with a discharge valve. The lower surface of the heat preservation box (1) is provided with a through hole that can accommodate the settling hopper (11).

5. The waste heat recovery and utilization device for a tea fixing machine according to claim 1, characterized in that, The filtration mechanism includes: The filter plate (12) is snapped into the inner cavity of the filter box (2). The filter plate (12) has a vent hole. The filter plate (12) is located above the exhaust gas inlet (5). A cleaning component is provided above the filter plate (12).

6. The waste heat recovery and utilization device for a tea fixing machine according to claim 5, characterized in that, The cleaning assembly includes: A stepper motor (13) is fixedly installed at the middle position of the upper surface of the filter box (2). A transmission rod (14) coaxially connected to the output shaft of the stepper motor (13) is rotatably installed in the inner cavity of the filter box (2). A brush plate (15) is fixedly installed at the bottom end of the transmission rod (14). The brush part on the lower surface of the brush plate (15) is in contact with the filter plate (12).

7. The waste heat recovery and utilization device for a tea fixing machine according to claim 6, characterized in that, The cleaning assembly also includes: Two liquid storage tanks (16) are symmetrically fixedly installed on the upper surface of the filter box (2). A booster water pump (17) is fixedly installed inside the liquid storage tank (16). A liquid delivery pipe (18) is fixedly installed at the output end of the booster water pump (17). A horizontal pipe (19) is fixedly installed at the bottom end of the liquid delivery pipe (18). Multiple high-pressure atomizing nozzles (20) are fixedly installed on the horizontal pipe (19) in a linear and equidistant manner. An injection port (21) is provided on the upper surface of the liquid storage tank (16), and the other end of the injection port (21) passes through the heat preservation box (1) and extends to the outside.

8. The waste heat recovery and utilization device for a tea fixing machine according to claim 7, characterized in that, One of the horizontal pipes (19) has multiple high-pressure atomizing nozzles (20) that spray downwards at an angle, and the liquid storage tank (16) connected to it is filled with clean water. The other horizontal pipe (19) has multiple high-pressure atomizing nozzles (20) that spray upwards at an angle, and the liquid storage tank (16) connected to it is filled with cleaning fluid.

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