A freeze dryer for jasmine tea

Abstract

The application belongs to the technical field of freeze-drying, and specifically relates to a freeze-drying machine for jasmine tea; the freeze-drying machine comprises a furnace body and further comprises: an adjusting assembly, when a humidity detector detects that the humidity value increases, the circular shell drives the air outlet to move upward, the hot air output by the air outlet is reduced and moves away from the tray; a rotating assembly, when jasmine tea in the tray is freeze-dried, the rotating part and the air outlet reciprocatingly rotate and drive the tray to vibrate up and down; and a defrosting assembly arranged in the adjusting assembly and used for melting frost formed on the inner wall of the furnace body in the freeze-drying process of the jasmine tea, when the humidity detector detects that the humidity value reaches a minimum value, the tray is attached to the shell and the side discharge hole is closed; through the adjusting assembly and the rotating assembly, the freeze-drying machine realizes accurate temperature control and micro-vibration of different trays in the freeze-drying process, ensures that the jasmine tea is uniformly heated and prevents the jasmine tea from being hardened, and the defrosting assembly can automatically defrost during operation, thereby ensuring continuous and efficient operation.

Description

Technical Field

[0001] This invention belongs to the field of freeze-drying technology, specifically a freeze dryer for jasmine tea. Background Technology

[0002] Traditional jasmine tea drying processes suffer from imprecise temperature control, which easily leads to the loss of its unique volatile aromatic substances and causes problems such as yellowing color and dull taste. Although freeze-drying technology improves the situation by using low-temperature treatment, there are still significant drawbacks to applying existing equipment to jasmine tea drying: First, it is impossible to achieve differentiated and precise temperature control in different areas of the drying chamber, resulting in uneven drying of the tea and affecting the overall quality; second, the tea is prone to caking during the drying process, hindering the escape of water vapor and reducing thermal efficiency; and third, frost formation on the inner wall of the furnace affects heat transfer, while traditional defrosting operations interfere with the stability of the process.

[0003] CN112683009A discloses a freeze dryer, including a housing and multiple lower concave plates and multiple upper concave plates disposed within the housing. The lower and upper concave plates are arranged alternately. The upper surface of the lower concave plates is provided with a first flow channel, and the upper surface of the upper concave plates is provided with a second flow channel. Both the upper and lower concave plates are provided with a discharge port.

[0004] The above solution has a simple structure. During the freezing process of jasmine tea, it can only continuously heat the tea through the partition. It cannot adjust the heating rate of the jasmine tea according to its own humidity value during the heating process, resulting in uneven heating of the tea. This leads to differences in the moisture content of the tea on different trays, which affects the taste and quality of the jasmine tea.

[0005] During the freeze-drying process of jasmine tea, the tea leaves tend to stick together, causing them to clump and harden due to moisture migration. This results in uneven heating of the tea leaves on both the top and bottom surfaces, ultimately affecting the taste and quality of the jasmine tea.

[0006] Meanwhile, during the long sublimation drying process, a layer of frost will condense on the inner wall of the furnace due to the low temperature environment. This frost will affect the freeze-drying process of jasmine tea, preventing water vapor from being properly discharged and also affecting the service life of the furnace.

[0007] Therefore, it is necessary to develop a method that features uniform heating, vibration, and a smooth texture for freeze-drying jasmine tea. Summary of the Invention

[0008] The purpose of this invention is to provide a freeze dryer for jasmine tea, which aims to solve the problems of easy frost formation on the inner wall of the freeze dryer in the prior art, uneven heating of the jasmine tea, inability to adjust the heating rate, and easy caking of the jasmine tea.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a freeze dryer for jasmine tea, comprising a furnace body, and further comprising:

[0010] The regulating component, with multiple arrays arranged inside the furnace body, is used to regulate the sublimation rate of the tea in each area. It includes an outer shell, with multiple circular shells and air outlets movably connected below the outer shell. Multiple trays are movably connected below the circular shells, and multiple humidity detectors are arrayed above the trays. When the humidity detectors detect a decrease in humidity, the circular shells drive the air outlets to move upward, reducing the amount of hot air output from the air outlets and moving them away from the trays.

[0011] The rotating component, which is located inside the adjusting component, includes a rotating part. When the jasmine tea inside the tray is freeze-dried, the rotating part and the circular shell reciprocate and drive the tray to vibrate up and down.

[0012] The defrosting assembly, located inside the regulating assembly, is used to melt the frost formed on the inner wall of the furnace during the freeze-drying process of jasmine tea. It includes a side drain hole. When the humidity detector detects that the humidity value has reached the minimum value, the tray adheres to the outer shell and closes the side drain hole.

[0013] A support plate, located inside the furnace body, is used to transmit hot air and provide a stable platform for the regulating components;

[0014] The gas generation system, including a vacuum pump, a refrigeration pump, and a heating pump, is located on one side of the furnace body. In the initial stage, the refrigeration pump works to make the internal environment of the furnace body low temperature. Then, the vacuum pump starts to work to make the internal environment of the furnace body vacuum low temperature. Finally, the heating pump starts to work to change the gas environment inside the furnace body during the freeze-drying process of jasmine tea.

[0015] The condenser section, located on the lower side of the furnace body, is used to collect the water vapor generated during the freeze-drying process of jasmine tea and condense it into liquid;

[0016] The channel is connected to the inside of the support plate at one end and to the inside of the adjustment component at the other end. It is equipped with a one-way valve to control the flow direction of hot air.

[0017] The jasmine tea freeze dryer of this invention achieves dynamic control of the entire process of jasmine tea from freezing to sublimation drying through refrigeration, vacuum, hot airflow regulation, vibration regulation, and automatic defrosting. Through multiple independent adjustment and rotation components, it achieves precise temperature control and micro-vibration of the drying process area, ensuring uniform heating of the jasmine tea and preventing caking. The defrosting component can automatically defrost during operation, ensuring continuous high efficiency. The fully automated control of the process maximizes the preservation of the color, aroma, and flavor of the jasmine tea, improves product consistency, and is suitable for large-scale production.

[0018] Preferably, the adjustment component further includes:

[0019] The push rod, located inside the housing, is used to control the overall height of the adjustment assembly;

[0020] A hollow shell is located on the lower side of the push rod and is used for the storage and transmission of hot air.

[0021] The outer shell sidewalls are fixedly connected to both sides of the support plate, and the circular shell is fixedly connected to the lower side of the hollow shell for the storage and transmission of hot air.

[0022] Preferably, the adjustment component further includes:

[0023] A cavity, formed inside the outer shell, is used for the storage and distribution of hot air during the freeze-drying process of jasmine tea;

[0024] The distribution chamber, formed inside the hollow and circular shells, is used for the storage and transfer of hot air during the freeze-drying process of jasmine tea;

[0025] The air inlet, with multiple arrays arranged inside the side wall of the hollow shell, is connected at one end to the cavity and at the other end to the distribution cavity, and is used for the transmission of hot air during the freeze-drying process of jasmine tea.

[0026] Preferably, the adjustment component further includes:

[0027] The torsion spring sleeve is movably set on the outer surface of the hollow shell and is used to move the tray during the freeze-drying process of jasmine tea. It has a slide rail inside and a support rod is fixedly connected to the bottom of the cavity. The bottom of the torsion spring sleeve contacts the top of the support rod.

[0028] The slide rod is located inside the slide rail and is fixedly connected to the outer surface of the hollow shell. The rotation of the hollow shell drives the torsion spring sleeve to rotate through the slide rod.

[0029] The slider, located on the lower side of the slide rod, is used to drive the torsion spring housing upward after the slide rod moves upward to a certain height.

[0030] Preferably, the adjustment component further includes:

[0031] The buckle, located on the upper surface of the tray, is used to connect the tray and move it up and down during the freeze-drying process of jasmine tea.

[0032] The suspension rope has one end passing through the outer shell and connecting to the inside of the torsion spring housing, and the other end connecting to the buckle, which is used to drive the buckle to move up and down.

[0033] The humidity detector is used to detect the humidity level of the jasmine tea above the tray in real time and transmit the signal.

[0034] Preferably, the rotating assembly further includes:

[0035] A sliding component, located inside the rotating component, is used to drive the rotating component to reciprocate during the freeze-drying process of jasmine tea;

[0036] The magnetic component is located inside the slider and is used to drive the slider to move along the rotating component;

[0037] The elastic part, one end of which is connected to the inner surface of the rotating part and the other end of which is connected to the surface of the magnetic part, is used to provide power for the reset of the sliding part;

[0038] A magnetic block is fixedly installed inside the push rod to provide magnetic attraction for the movement of the magnetic part.

[0039] Preferably, the defrosting component includes:

[0040] A wedge-shaped piece is placed on the lower side of the side exhaust hole to change the direction of hot air flow and block the side exhaust hole;

[0041] A pusher block, located on the upper surface of the tray, is used to push the wedge-shaped piece upwards;

[0042] Side exhaust holes are opened on the side wall of the outer shell to transfer hot air to the inner wall of the furnace.

[0043] Preferably, the horizontal outer surface of the outer shell has the same shape as the inner surface of the corresponding furnace body in that area, the upper surface of the wedge-shaped member has the same shape as the corresponding inner surface of the outer shell, and multiple air outlets are opened inside the circular shell, one end of which is connected to the distribution cavity and the other end is connected to the outside, for outputting hot air to the surface of the jasmine tea during the freeze-drying process. The rotating member is fixedly set on the upper surface of the hollow shell, for driving the hollow shell to reciprocate during the freeze-drying process of the jasmine tea.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] 1. This device achieves precise control of different areas inside the furnace through multiple independently controlled adjustment components. Each adjustment component is equipped with a humidity detector, which can monitor the humidity value of the jasmine tea in the corresponding area in real time. When the humidity value of a certain area decreases, it can automatically adjust the distance between the air outlet and the tray, control the intensity of hot air supply, reduce the flow rate and flow of hot air reaching the surface of the jasmine tea, weaken the heat exchange intensity, and prevent the quality from declining due to overheating or excessive drying.

[0046] 2. This device uses multiple rotating components to drive the tray to vibrate slightly, effectively breaking the temperature boundary layer. The continuous change in the position of the air outlet ensures that the amount and speed of hot air that comes into contact with the surface of the jasmine tea are consistent, ensuring that the quality of each batch of jasmine tea is consistent. At the same time, the rotating components drive the tray to vibrate up and down, effectively breaking the static air boundary layer on the surface of the jasmine tea particles, enhancing the convective heat transfer efficiency between the hot air and the surface of the jasmine tea, and the vibration causes the jasmine tea particles to move relative to each other, which helps the jasmine tea in different positions to be heated and dried evenly.

[0047] 3. The defrosting component of this device realizes online defrosting function, which solves the efficiency bottleneck of long-term operation. When jasmine tea is freeze-dried, defrosting is automatically triggered. This design does not require interruption of the production process and can complete the frost removal without manual intervention, ensuring the continuous and efficient operation of the equipment. At the same time, after the freeze-drying of jasmine tea is completed, the tea is preserved in a sealed space formed by the tray and the outer shell to prevent external hot air from affecting it.

[0048] 4. This freeze dryer, through its highly integrated automated design, significantly reduces operational complexity and reliance on human experience. The system collects drying process data in real time through a group of humidity detectors, automatically controls the lifting and lowering of push rods to adjust the air distance and air volume, and links rotating components to achieve automatic air distribution and anti-caking. This fully automated control not only ensures that jasmine tea can be freeze-dried under optimal process parameters, maximizing the preservation of its color, aroma, flavor, and active ingredients, but also greatly improves the standardization level and batch consistency of production, which is conducive to large-scale industrial applications. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0050] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the adjustment component and defrosting component of the present invention;

[0051] Figure 3 This is a bottom-view perspective view of the adjustment component and defrosting component of the present invention.

[0052] Figure 4 This is a top-view perspective view of the adjustment component and defrosting component of the present invention.

[0053] Figure 5 This is a three-dimensional structural diagram of the internal cross-sectional portion of the adjustment component, rotation component, and defrosting component of the present invention.

[0054] Figure 6 This is a three-dimensional structural diagram of the adjustment component and the rotation component of the present invention;

[0055] Figure 7This is a rear cross-sectional three-dimensional structural diagram of the adjustment component and the rotation component of the present invention;

[0056] Figure 8 This is a right-side cross-sectional perspective view of the adjustment component and rotation component of the present invention.

[0057] Figure 9 This is a three-dimensional structural diagram of the torsion spring housing of the present invention.

[0058] In the diagram: 1. Furnace body; 2. Gas production system; 3. Condensation section; 4. Adjustment component; 401. Outer shell; 402. Cavity; 403. Push rod; 404. Hollow shell; 405. Slide rod; 406. Slider; 407. Torsion spring sleeve; 408. Distribution chamber; 409. Air inlet; 4010. Circular shell; 4011. Air outlet; 4012. Slide rail; 4013. Hanging rope; 4014. Buckle; 4015. Humidity detector; 4016. Support rod; 5. Rotating component; 501. Rotating part; 502. Sliding part; 503. Magnetic block; 504. Elastic part; 505. Magnetic part; 6. Defrosting component; 601. Side exhaust hole; 602. Wedge-shaped part; 603. Push block; 7. Support plate; 8. Tray; 9. Channel. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] like Figures 1 to 9 As shown, a freeze dryer for jasmine tea includes a furnace body 1 and an adjustment component 4, multiple of which are arranged in an array inside the furnace body 1 for independent, dynamic, and precise adjustment based on the differences in the sublimation rate of the jasmine tea in different areas. The component includes a shell 401, with multiple circular shells 4010 and air outlets 4011 movably connected below the shell 401 to direct hot air to the surface of the jasmine tea. Multiple trays 8 are movably connected below the circular shells 4010, and multiple humidity detectors 4015 are arrayed above the trays 8 to monitor the humidity value of the corresponding area of ​​jasmine tea in real time. When the humidity detectors 4015 detect a decrease in humidity, the circular shells 4010 move the air outlets 4011 upwards, reducing the amount of hot air output from the air outlets 4011 and moving them away from the trays 8. This reduces the flow rate and velocity of hot air reaching the surface of the jasmine tea, actively slowing down the sublimation rate in that area and preventing the jasmine tea from deteriorating in quality due to overheating.

[0061] The rotating component 5, which is located inside the adjusting component 4, includes a rotating part 501, which is used to drive the air outlet 4011 to reciprocate during the drying process. When the jasmine tea inside the tray 8 is freeze-drying, the rotating part 501 and the air outlet 4011 reciprocate and drive the tray 8 to vibrate up and down, so that the hot air scans and heats the surface of the tea, avoiding local overheating. At the same time, the vibration prevents the tea particles from sticking and caking, maintaining its loose and porous structure.

[0062] The defrosting component 6, located inside the regulating component 4, is used to melt the frost formed on the inner wall of the furnace body 1 during the freeze-drying process of jasmine tea. It includes a side exhaust hole 601, which guides some hot air to the inner wall of the furnace body 1 for defrosting. When the humidity detector 4015 detects that the humidity value has reached the minimum value, it indicates that the drying of this area is complete. The tray 8 is attached to the outer shell 401 and the side exhaust hole 601 is closed to stop the output of defrosting hot air, save energy and prevent secondary heating of the dried jasmine tea.

[0063] The support plate 7, located inside the furnace body 1, receives hot air from the gas generation system 2 and evenly transmits it to each regulating component 4, while providing a stable platform for the regulating components 4. The gas generation system 2, including a vacuum pump, a refrigeration pump, and a heating pump, is located on one side of the furnace body 1. In the initial stage, the refrigeration pump works to make the internal environment of the furnace body 1 a low-temperature state. Then, the vacuum pump starts working to make the internal environment of the furnace body 1 a vacuum low-temperature state. Finally, the heating pump starts working to change the gas environment inside the furnace body 1 during the freeze-drying process of jasmine tea.

[0064] The condenser 3 is located on the lower side of the furnace body 1. It is used to collect the water vapor generated during the freeze-drying process of jasmine tea and condense it into liquid to maintain a continuous low temperature and low pressure environment inside the furnace. The channel 9 is connected to the inside of the support plate 7 at one end and to the inside of the regulating component 4 at the other end. It is equipped with a one-way valve to control the flow direction of hot air, ensuring that the hot air flows unidirectionally from the inside of the support plate 7 to the regulating component 4, and preventing backflow of airflow from interfering with the stability of the system.

[0065] The adjustment assembly 4 also includes: a push rod 403, located inside the housing 401, used to control the overall height of the adjustment assembly 4; the push rod 403 can be an electric telescopic rod or similar structure; a hollow shell 404, located below the push rod 403, used for storing and transmitting hot air; and a circular shell 4010, located below the hollow shell 404, used for storing and transmitting hot air. The side walls of the housing 401 are fixedly connected to both sides of the support plate 7. The movement of the push rod 403 drives the hollow shell 404 and the circular shell 4010 to move, precisely controlling the distance between the circular shell 4010 and the tray 8, thereby achieving the regulation of the heating rate of jasmine tea in different areas.

[0066] The regulating component 4 further includes: a cavity 402, formed inside the outer shell 401, for storing and distributing hot air during the freeze-drying process of jasmine tea, and for initial pressure equalization and distribution within it; a distribution cavity 408, formed inside the hollow shell 404 and the circular shell 4010, for storing and transmitting hot air during the freeze-drying process of jasmine tea, providing pressure balance for the final uniform air discharge from the air outlet 4011; and multiple air inlets 409, arranged in an array inside the side wall of the hollow shell 404, one end of which communicates with the cavity 402, and the other end of which connects to the interior of the distribution cavity 408. The cavity 402 is connected to the hollow shell 404 for hot air transmission during the freeze-drying process of jasmine tea. Its area changes with the rise and fall of the hollow shell 404 to achieve air volume regulation. Multiple air outlets 4011 are arrayed inside the circular shell 4010. One end of each outlet is connected to the distribution cavity 408, and the other end is connected to the outside air. They are used to output hot air to the surface of the jasmine tea during the freeze-drying process. The hot air in the distribution cavity 408 is directed to the surface of the jasmine tea below at a certain speed and angle to provide the heat required for sublimation.

[0067] The adjustment component 4 also includes a torsion spring housing 407, which is movably disposed on the outer surface of the hollow shell 404. Its core function is to convert the rotational motion generated by the rotating component 5 into the linear motion of the lifting tray 8, and to assist in the reset by relying on its own torsion spring characteristics when the rotating component 5 is reset. A slide rail 4012 is provided inside to guide the motion. A support rod 4016 is fixedly connected to the inner bottom of the cavity 402. The bottom of the torsion spring housing 407 is in contact with the top of the support rod 4016. Therefore, there is a certain gap between the bottom of the torsion spring housing 407 and the inner bottom of the cavity 402, which is used for the movement of the air inlet 409. At the same time, the torsion spring housing 407 can move and rotate upward on the support rod 4016, and adjust the overlapping area with the air inlet 409 to adjust the amount of hot air entering the distribution chamber 408 along the air inlet 409 inside the cavity 402.

[0068] A slide rod 405 is located inside the slide rail 4012 and is fixedly connected to the outer surface of the hollow shell 404. The rotation of the hollow shell 404 drives the torsion spring housing 407 to rotate via the slide rod 405. A slider 406 is located below the slide rod 405 and is used to move the slide rod 405 upward to a certain height, thereby driving the torsion spring housing 407 upward to partially block the air inlet 409 and achieve auxiliary airflow adjustment. When the humidity detector 4015 detects a change in the humidity value of the jasmine tea, the output end of the push rod 403 drives the slide rod 405 to move up and down synchronously within the slide rail 4012. The slide rail 4012 and the slide rod 405 provide limits and guidance for the up and down movement of the slide rod 405, so that the up and down movement of the slide rod 405 within the slide rail 4012 will not affect the vertical movement of the torsion spring housing 407. When the hollow shell 404 drives the slide rod 405 to rotate horizontally, the slide rod 405 drives the torsion spring housing 407 to rotate synchronously.

[0069] The adjustment component 4 also includes: a buckle 4014, which is disposed on the upper surface of the tray 8 and effectively transmits the lifting action of the torsion spring housing 407 to the tray 8. It is used to connect the tray 8 and drive the tray 8 to move up and down during the freeze-drying process of jasmine tea; a suspension rope 4013, one end of which passes through the outer shell 401 and connects to the inside of the torsion spring housing 407, and the other end of which is connected to the buckle 4014 as a flexible connector for transmitting power. It is used to lift the tray 8 when the torsion spring housing 407 rotates and release the tray 8 when it returns to its original position, causing it to vibrate up and down, thereby driving the buckle 4014 to move up and down; and a humidity detector 4015, which is used to detect the humidity value in the jasmine tea in real time and transmit the signal as a decision basis for the action of the adjustment component 4.

[0070] The rotating assembly 5 further includes: a slider 502, disposed inside the rotating assembly 501, serving as a wind-driven component, capable of rotating around the axis of the push rod 403 under the action of hot air, used to drive the rotating assembly 501 to reciprocate during the freeze-drying process of jasmine tea; a magnetic part 505, disposed inside the slider 502, used to drive the slider 502 to move along the rotating assembly 501; and an elastic part 504, one end of which is connected to the inner surface of the rotating assembly 501, and the other end of which is connected to the surface of the magnetic part 505, used to support the slider. The reset of 502 provides power; the magnetic block 503 is fixedly installed inside the push rod 403 and is used to provide power for the movement of the magnetic part 505. When the slider 502 rotates to align with it, it generates an attraction with the magnetic part 505, triggering the slider 502 to quickly retract. The rotating part 501 is fixedly installed on the upper surface of the hollow shell 404 and is used to change the angle of the hollow shell 404 during the freeze-drying process of jasmine tea, causing the hollow shell 404, the circular shell 4010 and the air outlet 4011 to swing synchronously.

[0071] The defrosting assembly 6 includes: a wedge 602 disposed on the lower side of the side exhaust hole 601, used to change the flow direction of hot air and block the side exhaust hole 601; and a pusher 603 disposed on the upper surface of the tray 8, used to push the wedge 602 to move and rise and fall with the tray 8. When the tray 8 rises (drying is complete), the pusher 603 contacts and pushes the wedge 602 upward to block the side exhaust hole 601, thereby automatically turning off the defrosting function in this area. The side exhaust hole 601 is opened on the side wall of the outer shell 401 to transmit hot air to the inner wall of the furnace body 1 and use the heat of the hot air to melt the frost condensed on the inner wall.

[0072] The horizontal outer surface of the outer shell 401 in different regions has the same shape as the inner surface of the furnace body 1 corresponding to that region, so as to ensure that the outer shell 401 and the inner wall of the furnace body 1 maintain a minimum and uniform gap, optimize the hot air flow direction and reduce energy loss; the upper surface of the wedge 602 has the same shape as the inner surface of the corresponding outer shell 401, and is used to form a tight surface contact seal with the inner wall of the outer shell 401 when in the closed position, effectively blocking the airflow.

[0073] In use, first, fix the furnace body 1 in place and check its airtightness. The operator then evenly spreads the freshly picked and sorted jasmine tea on the tray 8. The humidity detector 4015 detects the humidity value of the jasmine tea to ensure the smooth passage of hot air and sublimated water vapor. Subsequently, close and lock the furnace cover on top of the furnace body 1 to ensure that the entire furnace body is airtight. Start the refrigeration pump in the gas generation system 2. The refrigeration pump starts working and pumps low-temperature refrigerant into the interior of the furnace body 1, strongly absorbing the heat inside the furnace and rapidly reducing the internal temperature of the furnace body 1 to a low temperature of -35°C to -40°C. This low-temperature environment will completely freeze the free water and some bound water inside and on the surface of the jasmine tea into tiny ice crystals. The pre-freezing stage usually needs to be maintained for 1-2 hours to ensure that the temperature inside and outside of the tea is balanced and completely frozen.

[0074] Once the pre-freezing inside the furnace body 1 is complete, the vacuum pump in the gas generation system 2 is activated. The vacuum pump begins to extract air and other non-condensable gases from the furnace body 1, reducing the pressure inside the furnace to an extremely low level (usually 10-30 Pascals). This low-pressure environment significantly lowers the boiling point of water, creating the necessary conditions for ice crystals to directly sublimate into water vapor at low temperatures. While maintaining the vacuum environment, the heat pump starts to work, generating controlled low-temperature hot air (the temperature range is usually set between 30°C and 50°C). This hot air is then sent into the support plate 7.

[0075] When the jasmine tea freezing begins, the push rod 403 inside the outer shell 401 is in its initial state. The push rod 403 drives the hollow shell 404 to its initial position. The air inlet 409 on the hollow shell 404 is partially blocked. The hot air inside the support plate 7 is distributed to each cavity 402 through the channel 9. The humidity detector 4015 detects the humidity value of the jasmine tea on the tray 8 in real time and adjusts the height of the push rod 403 according to the detection data of the humidity detector 4015.

[0076] After the hot air is blown into the cavity 402 through the inside of the support plate 7, part of the hot air is blown into the distribution cavity 408 formed inside the hollow shell 404 and the circular shell 4010 through the air inlet 409. Finally, it is blown into the jasmine tea on the tray 8 from the array of air outlets 4011 at a certain speed and angle. The heat energy is transferred through the tea layer to the frozen ice crystals inside. After the ice crystals absorb the heat, the molecular kinetic energy increases and they directly sublimate from solid to gas. The gas produced by sublimation is led to the condenser 3 and condensed into liquid water and discharged from the system.

[0077] During the long sublimation drying process, a layer of frost will condense on the inner wall of the furnace body 1 due to the low temperature environment, which will affect the freeze-drying process of jasmine tea. Therefore, another part of the hot air inside the cavity 402 is blown to the inner wall of the furnace body 1 through the side exhaust hole 601 to heat up and melt the frost formed on the inner wall. The water vapor generated by the melting of the frost is also received by the condenser 3.

[0078] At the same time, the hot air blowing towards the side exhaust hole 601 first acts on the surface of the sliding member 502. In the initial state, the rotating member 501 is perpendicular to the direction of the hot air under the gravity of the torsion spring sleeve 407 and the tray 8. The sliding member 502 is in the extended state under the action of the elastic part 504. The wind pushes the sliding member 502 to rotate around the push rod 403 as the center. The rotation of the sliding member 502 drives the rotating member 501 to rotate. The rotation of the rotating member 501 drives the hollow shell 404 to rotate. The rotation of the hollow shell 404 drives the slide rod 405 to rotate. The rotation of the slide rod 405 drives the torsion spring sleeve 407 to rotate. The rotation of the torsion spring sleeve 407 tightens the suspension rope 4013. The tightening of the suspension rope 4013 causes the buckle 4014 and the tray 8 below it to move upward.

[0079] When the slider 502 rotates to a certain angle, the force exerted by the hot air on the surfaces of the slider 502 and the rotating part 501, along with the torsion spring housing 407 and the weight of the tray 8, remains balanced. At this time, the magnetic parts 505 and 503 on the surface of the slider 502 are parallel. Since the magnetic block 503 and the magnetic part 505 on the slider 502 have opposite polarities and generate magnetic attraction, the magnetic attraction causes the slider 502 to compress the elastic part 504 inside the rotating part 501 and move. As the slider 502 is retracted, the force on its surface under the action of the hot air continuously decreases, eventually balancing out under the weight of the tray 8 and the force exerted by the hot air. Under the torque of the torsion spring housing 407, the rotating part 501 quickly returns to its initial position, the force of the magnetic block 503 on the magnetic part 505 disappears, and under the action of the elastic part 504, the rotating part 501 returns to its initial position. The rotating part 501 drives the torsion spring housing 407 to rotate in the opposite direction to return to its original position, the tightened hanging rope 4013 is released, and the buckle 4014 and the tray 8 below it return to their initial positions. Then, the above actions are repeated continuously, causing the jasmine tea on the tray 8 to vibrate up and down continuously, thereby improving the uniformity of contact between the jasmine tea and the hot air and ensuring the dehumidification effect on the jasmine tea.

[0080] The continuous rotation of the sliding component 502 causes the circular shell 4010 and the air outlet 4011 to oscillate continuously. The hot air is no longer blown fixedly to one point, but scans the surface of the jasmine tea in a range, avoiding local overheating of the jasmine tea above the tray 8 and achieving a more uniform heat distribution. At the same time, the rotation and vibration of the sliding component 502 are transmitted to the tray 8 through the hanging rope 4013, causing it to continuously generate up-and-down micro-vibrations. The vibration can effectively break the static air boundary layer on the surface of the tea particles, enhance the convective heat transfer efficiency between the hot air and the surface of the tea, prevent the tea from sticking together and hardening due to moisture migration during the drying process, and maintain a loose and porous structure. The micro-vibrations cause the tea particles to have relative displacement, which helps the tea in different positions to be heated and dried evenly.

[0081] During the freeze-drying process of jasmine tea, when the humidity detector 4015 detects a decrease in humidity in a certain area, it indicates that the sublimation rate of the jasmine tea in that area is relatively fast. The humidity detector 4015 transmits the data to the control unit of the push rod 403, which controls the output end of the push rod 403 to move the hollow shell 404 upward. The movement of the hollow shell 404 causes the circular shell 4010 and the air outlet 4011 to move upward. When the hollow shell 404 moves upward, it causes the slide rod 405 to move upward along the slide rail 4012. Therefore, the height of the torsion spring sleeve 407 does not change, and the height of the jasmine tea above the corresponding tray 8 remains unchanged. This increases the distance between the air outlet 4011 and the jasmine tea on the tray 8. When the hot air reaches the surface of the jasmine tea, the flow rate will decrease, the flow rate will be relatively reduced, and the heat exchange intensity will be weakened, thereby moderately slowing down the sublimation rate of the jasmine tea in that area and preventing quality degradation due to overheating or excessive drying.

[0082] The upward movement of the hollow shell 404 causes the air inlet 409 to be blocked by the torsion spring sleeve 407, reducing the total amount of hot air flowing from the cavity 402 through the air inlet 409 into the distribution cavity 408, thereby reducing the air volume at the air outlet 4011 and reducing the amount of hot air on the surface of the jasmine tea on the tray 8, thus slowing down the sublimation rate of the jasmine tea and preventing quality degradation due to overheating or excessive drying.

[0083] When the humidity detector 4015 detects an increase in humidity in a certain area, it indicates that the sublimation rate of the jasmine tea in that area is relatively slow. The humidity detector 4015 transmits the data to the control unit of the push rod 403, which controls the output end of the push rod 403 to move the hollow shell 404 downward. The movement of the hollow shell 404 causes the circular shell 4010 and the air outlet 4011 to move downward. This reduces the distance between the air outlet 4011 and the jasmine tea on the tray 8. When the hot air reaches the surface of the jasmine tea, the flow rate increases, the flow rate increases relatively, the heat exchange intensity is enhanced, and the sublimation of the remaining moisture is promoted, ensuring uniform drying.

[0084] When the humidity detector 4015 detects that the humidity value of the jasmine tea on a certain tray 8 has reached the set minimum value, it indicates that the water content in the jasmine tea on the tray 8 has reached the minimum value, and no further heating is required. At this time, the push rod 403 is retracted to its maximum distance. The output end of the push rod 403 drives the hollow shell 404 and the slide rod 405 to move upward. The movement of the slide rod 405 drives the slider 406 to move. As the slider 406 continues to move upward, the slider 406 contacts the torsion spring sleeve 407 and drives the torsion spring sleeve 407 to move upward synchronously. The torsion spring sleeve 407 moves upward. The suspension rope 4013 and tray 8 move upwards. The upward movement of tray 8 causes push block 603 to contact wedge 602 and drive wedge 602 to move upwards simultaneously. The upward movement of wedge 602 eventually blocks the side exhaust hole 601, preventing hot air from blowing out of the side exhaust hole 601. At the same time, the upward movement of tray 8 causes the upper surface of the side wall of tray 8 to contact the lower surface of outer shell 401, forming a sealed space between tray 8 and outer shell 401. This prevents hot air from other areas from coming in and avoids overheating of jasmine tea, which would cause its internal moisture content to be too low, affecting its taste and quality.

[0085] When the humidity values ​​detected by the humidity detectors 4015 in all areas reach the set minimum value, and the pressure in the furnace body 1 and the temperature in the condenser section 3 tend to stabilize, the control system determines that the jasmine tea has reached the target moisture content (usually below 5%). Subsequently, the system automatically executes the shutdown procedure, sequentially stopping the hot air supply, turning off the vacuum pump, and finally stopping the refrigeration pump. Finally, dry sterile air is slowly injected into the furnace body 1 to restore the pressure inside the furnace to atmospheric pressure. The furnace lid is then opened, and the operator can remove the freeze-dried jasmine tea along with the tray 8. Jasmine tea processed in this way can maintain its natural emerald green color and complete flower shape, with minimal loss of aroma substances, good rehydration properties, and is easy to store and transport for a long time.

[0086] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0087] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A freeze dryer for jasmine tea, comprising a furnace body, characterized in that, Also includes: Adjusting assembly, for a plurality of parallel array is arranged in the furnace body inside, for adjusting each area jasmine tea sublimation rate, adjusting assembly includes shell, shell below movable connection with a plurality of circular shell and a plurality of air outlet, circular shell below movable connection with tray, tray above array is provided with a plurality of humidity detector, when the humidity detector detects the humidity value reduces, circular shell drives air outlet to move up, air outlet output hot air volume reduces and away from the tray; Rotary assembly, which is arranged in the adjusting assembly, comprising a rotating member, when the tray inside jasmine tea in freeze drying, rotating member and circular shell reciprocating rotation and drive tray vibration up and down; Defrosting assembly, which is arranged in the adjusting assembly, for melting the frost formed on the inner wall of the furnace during the freeze drying process of jasmine tea, comprising a side exhaust hole, when the humidity detector detects that the humidity value reaches the minimum value, the tray is attached to the shell and closes the side exhaust hole; Support plate, which is arranged in the inside of the furnace body, for transmitting hot air and providing a stable platform for the adjusting assembly; Gas system, comprising a vacuum pump, a refrigeration pump and a heating pump, is arranged on one side of the furnace body. In the initial stage, the refrigeration pump works to change the internal environment of the furnace body into a low temperature state. Then the vacuum pump starts to work to change the internal environment of the furnace body into a vacuum low temperature state. Finally, the heating pump starts to work to change the gas environment in the furnace body during the freeze drying process of jasmine tea. Condensing part, arranged on the lower side of the furnace body, for collecting water vapor generated during the freeze drying process of jasmine tea and condensing into liquid; Channel, one end of which is connected with the inside of the support plate, and the other end is connected with the inside of the adjusting assembly, the inside of the channel is provided with a one-way valve for controlling the flow direction of hot air; The adjusting assembly further comprises: Push rod, arranged in the inside of the shell, for controlling the height of the hollow shell and the circular shell; Hollow shell, arranged on the lower side of the push rod, for storing and transmitting hot air; Cavity, which is formed in the inside of the shell, for storing and distributing hot air during the freeze drying process of jasmine tea; Distribution cavity, formed in the inside of the hollow shell and the circular shell, for storing and transmitting hot air during the freeze drying process of jasmine tea; Air inlet, which is arranged on the side wall of the hollow shell, one end of which is connected with the cavity, and the other end is connected with the inside of the distribution cavity, for transmitting hot air during the freeze drying process of jasmine tea; Torsion spring sleeve, movably arranged on the outer surface of the hollow shell, for moving the tray during the freeze drying process of jasmine tea, the inside of the torsion spring sleeve is provided with a slide, the inner bottom of the cavity is fixedly connected with a support rod, and the bottom of the torsion spring sleeve is in contact with the top of the support rod; Slide rod, arranged in the inside of the slide and fixedly connected with the outer surface of the hollow shell, the hollow shell rotates to drive the torsion spring sleeve to rotate through the slide rod; Slide block, arranged on the lower side of the slide rod, for driving the torsion spring sleeve to move upward after the slide rod moves upward to a certain height; The defrosting assembly comprises: Wedge, arranged on the lower side of the side exhaust hole, for changing the flow direction of hot air and blocking the side exhaust hole; Push block, arranged on the upper surface of the tray, for pushing the wedge to move upward; Side exhaust hole is arranged on the side wall of the shell, for transmitting hot air to the inner wall of the furnace.

2. The freeze dryer for jasmine tea according to claim 1, characterized in that, The shell side wall is fixedly connected with both sides of the support plate, and the circular shell is fixedly connected with the lower side of the hollow shell and used for storing and transmitting hot air.

3. The freeze dryer for jasmine tea according to claim 1, characterized in that, The adjusting assembly further comprises: The buckle is arranged on the upper surface of the tray and used for connecting the tray and driving the tray to move up and down during the freeze-drying of jasmine tea; The hanging rope is connected with the buckle at one end and connected with the buckle at the other end, and used for driving the buckle to move up and down; The humidity detector is used for detecting the humidity value of the jasmine tea above the tray in real time and transmitting signals.

4. The freeze dryer for jasmine tea according to claim 1, characterized in that, The rotating assembly further comprises: The sliding member is arranged in the interior of the rotating member and used for driving the rotating member to reciprocate during the freeze-drying of jasmine tea; The magnetic force part is arranged in the interior of the sliding member and used for driving the sliding member to move in the interior of the rotating member; The elastic force part is connected with the inner surface of the rotating member at one end and connected with the surface of the magnetic force part at the other end, and used for providing power for the reset of the sliding member; The magnetic block is fixedly arranged in the interior of the push rod and used for providing magnetic attraction for the movement of the magnetic force part.

5. The freeze dryer for jasmine tea according to claim 4, characterized in that, The horizontal outer surface of the shell is the same as the inner surface shape of the corresponding furnace body in the region, the upper surface shape of the wedge-shaped part is the same as the corresponding inner surface of the shell, the air outlet is arranged on the circular shell, one end of the air outlet is communicated with the distribution cavity, and the other end is communicated with the outside, used for outputting hot air to the surface of the jasmine tea during the freeze-drying of the jasmine tea, and the rotating member is fixedly arranged on the upper surface of the hollow shell and used for driving the hollow shell to reciprocate during the freeze-drying of the jasmine tea.

Images