Vacuum freeze dryer
The vacuum freeze-drying machine addresses uneven drying issues by using adjustable shelves with rolling wheels and high-thermal conductivity heat plates for uniform heat distribution, enhancing drying quality and efficiency.
Patent Information
- Application Number
- CN202422289915.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-19
AI Technical Summary
In existing vacuum freeze-drying equipment, the pallets are not placed flexibly, resulting in uneven drying and uneven heat transfer, which affects the drying quality.
A vacuum freeze dryer is designed, using a heat-smoothing plate and a rolling wheel structure to ensure the horizontal placement of the tray and uniformly transfer heat through a heat-smoothing plate made of high-conducting medium material. Combined with a vacuum device and a heating device, rapid and uniform drying is achieved.
The uniform heating of the substance to be dried in a low temperature environment is achieved, the drying quality and efficiency are improved, the drying phenomenon is avoided, and the stability and effect of the drying process are ensured.
Smart Images
Figure CN223106538U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of dryers, in particular to a vacuum freeze dryer. Background Technique
[0002] Vacuum freeze-drying technology, abbreviated as freeze-drying technology, is an advanced drying method. Its core principle is the sublimation phenomenon, that is, the process in which solid substances directly change into gaseous state without passing through the liquid state to remove the moisture in the substances, so as to achieve the purpose of drying.
[0003] In the existing vacuum freeze-drying equipment, there is hard contact between the equipment and the tray for placing the objects to be dried. When taking out and putting in the tray, there is a lack of flexible adjustability, and the tray cannot be quickly placed and aligned properly. Moreover, the inclined tray easily causes the objects to be dried to gather and stack on the lower horizontal side, resulting in significant differences in the drying states between the surfaces and interiors of the objects to be dried and between different parts, affecting the drying quality. In addition, the objects to be dried in the existing vacuum freeze-drying equipment also face the problem of uneven heat transfer during the drying process in a low-temperature environment. The drying process depends on natural convection or simple heat conduction methods, with a slow drying speed and uneven heating of the objects to be dried, affecting the final drying quality.
[0004] In view of this, we propose a vacuum freeze dryer to solve the existing problems. Content of the Utility Model
[0005] The purpose of the utility model is to provide a vacuum freeze dryer to solve the problems put forward in the above background technique.
[0006] To achieve the above purpose, the utility model provides the following technical solution: A vacuum freeze dryer, including a drying box and a storage rack. The interior of the drying box is provided with a vacuum chamber for placing the storage rack. The front end of the drying box is provided with an opening communicating with the vacuum chamber. One end of the opening away from the vacuum chamber is connected with an end cover that can be movably closed to seal the opening. The storage rack includes two oppositely arranged brackets. A number of heat equalizing plates perpendicular to the brackets are fixedly connected between the two brackets. A storage space is formed between adjacent two heat equalizing plates. A tray for loading the objects to be dried is placed in the storage space. Rolling wheels are installed at the four corners of the upper and lower ends of the storage rack, so that the storage rack is slidably connected with the inner wall of the vacuum chamber.
[0007] Preferably, the storage rack further includes a number of connecting pieces, and the number of connecting pieces respectively pass through the side walls of the two brackets to fixedly connect the number of heat equalizing plates with the brackets.
[0008] Preferably, the number of heat equalizing plates are equidistantly arranged inside the two brackets.
[0009] Preferably, the heat equalizing plate is made of a high thermal conductivity medium material.
[0010] Preferably, a sealing ring is provided at the front end of the opening of the drying box, which fits the inner wall of the opening, and a sealing rubber ring cooperating with the sealing ring is provided on the side of the end cover relative to the opening.
[0011] Preferably, the end cover is made of a transparent material.
[0012] Preferably, the drying box is also connected with a vacuum pumping device. The air extraction end of the vacuum pumping device is provided with a vacuum tube, and the other end of the vacuum tube passes through the drying box and communicates with the vacuum chamber for evacuating the vacuum chamber.
[0013] Preferably, a drying device for heating the vacuum chamber is provided inside the drying box, and heat dissipation grooves for dissipating the remaining heat are provided at both ends of the side wall of the drying box.
[0014] Preferably, a display screen for displaying the drying state is provided at the front end of the outer surface of the drying box, and a traveling device for moving the drying box is provided at the bottom of the drying box.
[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: By arranging a heat sink plate on the storage rack, the present utility model improves the heat transfer efficiency during the drying process, enables the object to be dried to be evenly baked and dried by heat in a low-temperature environment. Rolling wheels are also arranged on the storage rack, which can conveniently take out, put into or adjust the placement angle of the storage rack in the vacuum chamber, so that the objects to be dried are evenly laid flat in the tray, ensuring uniform heat reception among the objects to be dried, thereby improving the drying quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a three-dimensional structure schematic diagram of the present utility model;
[0017] Figure 2 is a front view structure schematic diagram of the present utility model;
[0018] Figure 3 is a structure schematic diagram of the storage rack of the present utility model;
[0019] Figure 4 is a rolling structure schematic diagram between the storage rack and the vacuum chamber of the present utility model.
[0020] In the figure: 1, drying box; 11, display screen; 12, traveling device; 13, opening; 14, sealing ring; 15, vacuum chamber; 16, heat dissipation groove; 2, end cover; 3, vacuum pumping device; 31, vacuum tube; 4, storage rack; 41, support; 42, connecting piece; 43, heat sink plate; 44, rolling wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] The technical solutions of the present utility model will be further described below with reference to the accompanying drawings and specific embodiments. Embodiment
[0022] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, a vacuum freeze dryer proposed by the present utility model includes a drying chamber 1 and a storage rack 4. A vacuum chamber 15 for placing the storage rack 4 is provided inside the drying chamber 1. An opening 13 communicating with the vacuum chamber 15 is provided at the front end of the drying chamber 1. One end of the opening 13 away from the vacuum chamber 15 is connected with an end cover 2 that can be movably closed to seal the opening 13. The storage rack 4 includes two oppositely arranged brackets 41. A plurality of heat dissipation plates 43 perpendicular to the brackets 41 are fixedly connected between the two brackets 41. A storage space is formed between adjacent two heat dissipation plates 43. A tray for loading the object to be dried is placed in the storage space. Rolling wheels 44 are installed at the four corners of the upper and lower ends of the storage rack 4, so that the storage rack 4 is slidably connected with the inner wall of the vacuum chamber 15.
[0023] Furthermore, the storage rack 4 further includes a plurality of connecting members 42. The plurality of connecting members 42 respectively pass through the side walls of the two brackets 41 to fixedly connect the plurality of heat dissipation plates 43 with the brackets 41.
[0024] Furthermore, the plurality of heat dissipation plates 43 are equidistantly arranged inside the two brackets 41.
[0025] Furthermore, the heat dissipation plate 43 is made of a high thermal conductivity medium material.
[0026] Furthermore, a sealing ring 14 that fits the inner wall of the opening 13 is provided at the front end of the opening 13 of the drying chamber 1. A sealing rubber ring that cooperates with the sealing ring 14 is provided on the surface of the end cover 2 relative to the opening 13.
[0027] Furthermore, the end cover 2 is made of a transparent material.
[0028] Furthermore, the drying chamber 1 is also connected with a vacuum pumping device 3. The pumping end of the vacuum pumping device 3 is provided with a vacuum tube 31. The other end of the vacuum tube 31 passes through the drying chamber 1 and communicates with the vacuum chamber 15, and is used to pump the vacuum chamber 15.
[0029] Furthermore, a drying device (not shown in the figure) for heating the vacuum chamber 15 is provided inside the drying chamber 1. The drying device includes a heating device and a refrigeration device. Heat dissipation slots 16 for dissipating the remaining heat are provided at both ends of the side wall of the drying chamber 1.
[0030] Furthermore, a display screen 11 for showing the drying state is provided at the front end of the outer surface of the drying oven 1, and a traveling device 12 for moving the drying oven 1 is provided at the bottom of the drying oven 1, so that the drying oven 1 can be flexibly transferred. To facilitate the movement of the drying oven 1, the vacuum tube 31 connecting the drying oven 1 and the vacuum pumping device 3 can be made of a flexible corrugated pipe.
[0031] Based on the working principle of the vacuum freeze dryer in Embodiment 1: During use, the object to be dried is placed on the tray, and the tray is placed in the placement space formed between the two heat dissipation plates 43 of the placement rack 4. The placement rack 4 loaded with the object to be dried is pushed into the vacuum chamber 15 of the drying oven 1. The rolling wheels 44 provided on the placement rack 4 enable the placement rack 4 to be slidably connected to the inner wall of the vacuum chamber 15, so that it is easier to adjust the placement state of the placement rack 4 after the placement rack 4 is placed in the vacuum chamber 15. The placement rack 4 is adjusted to be in a horizontal state to prevent the object to be dried in the tray of the placement rack 4 from tilting and gathering towards one side due to the inclination of the placement rack 4, resulting in uneven heat absorption during drying. At the same time, it is also more convenient to take out or put in the placement rack 4, reducing the friction between the corners of the placement rack 4 and the inner wall of the vacuum chamber 15. After the placement rack 4 is placed and adjusted to be horizontal, the end cover 2 is closed so that the end cover 2 is tightly closed with the opening 13 at the front end of the drying oven 1. The sealing rubber ring on the end cover 2 cooperates with the sealing ring 14 on the inner wall of the opening 13 to ensure the sealing performance of the vacuum chamber 15 and prevent gas leakage during the vacuum pumping and heating processes.
[0032] During the drying process, the refrigeration device first cools the vacuum chamber 15 under normal temperature and pressure, so that the water molecules in the object to be dried condense into ice crystals. Then, while the heating device gradually heats up, the vacuum pumping device 3 connected to the drying oven 1 is started. The vacuum tube 31 of the vacuum pumping device 3 passes through the drying oven 1 and communicates with the vacuum chamber 15, and starts to pump out the air in the vacuum chamber 15 until the preset vacuum degree value is reached. After the vacuum chamber 15 reaches the required vacuum degree, the drying device inside the drying oven 1 is started to heat the vacuum chamber 15. Since the heat dissipation plate 43 is made of a high thermal conductivity medium material, it can quickly absorb heat and evenly transfer the heat to each tray, thereby drying the object to be dried. The top surface of the heat dissipation plate 43 in contact with the bottom of the tray not only supports the tray but also evenly conducts the heat to the tray, while the bottom surface of the heat dissipation plate 43 is directly above the tray placed on the adjacent heat dissipation plate 43, so that the heat dissipated from the bottom surface of the heat dissipation plate 43 can radiate to the object to be dried in the tray. Under the dual action of vacuum and heating, the moisture inside the object to be dried quickly sublimes directly from the ice crystal state, avoiding the melting stage in the traditional drying method, thereby retaining the original structure and nutritional components of the object to be dried. After the freeze drying is completed, first release the pressure, then gradually turn off the vacuum freeze dryer, and then open the end cover 2 to take out the tray in the placement rack 4.
[0033] During the entire drying process, the drying status and progress can be monitored in real time through the display screen 11 on the outer surface of the drying oven 1, and the key parameters of the drying process can be conveniently understood.
[0034] The above specific embodiments are merely several preferred embodiments of the present utility model. Based on the technical solution of the present utility model and the relevant revelations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.
Claims
1. A vacuum freeze dryer, comprising a drying chamber (1) and a storage rack (4). A vacuum chamber (15) for placing the storage rack (4) is provided inside the drying chamber (1). An opening (13) communicating with the vacuum chamber (15) is provided at the front end of the drying chamber (1). One end of the opening (13) away from the vacuum chamber (15) is connected with an end cover (2) that can be movably closed to seal the opening (13), characterized in that: The storage rack (4) includes two oppositely arranged brackets (41). A number of heat dissipation plates (43) perpendicular to the brackets (41) are fixedly connected between the two brackets (41). A storage space is formed between adjacent two heat dissipation plates (43). A tray for loading objects to be dried is placed in the storage space. Rolling wheels (44) are installed at the four corners of the upper and lower ends of the storage rack (4), so that the storage rack (4) is slidably connected to the inner wall of the vacuum chamber (15).
2. A vacuum freeze dryer according to claim 1, characterized in that: The storage rack (4) further includes a number of connecting pieces (42). The number of connecting pieces (42) respectively pass through the side walls of the two brackets (41) to fixedly connect the number of heat dissipation plates (43) with the brackets (41).
3. A vacuum freeze dryer according to claim 2, characterized in that: The number of heat dissipation plates (43) are equidistantly arranged inside the two brackets (41).
4. A vacuum freeze dryer according to claim 3, characterized in that: The heat dissipation plate (43) is made of a high thermal conductivity medium material.
5. A vacuum freeze dryer according to claim 1, characterized in that: A sealing ring (14) that fits the inner wall of the opening (13) is provided at the front end of the opening (13) of the drying box (1). A sealing rubber ring that cooperates with the sealing ring (14) is provided on the surface of the end cover (2) opposite to the opening (13).
6. A vacuum freeze dryer according to claim 5, characterized in that: The end cover (2) is made of a transparent material.
7. A vacuum freeze dryer according to claim 5, characterized in that: The drying box (1) is further connected with a vacuum pumping device (3). The air extraction end of the vacuum pumping device (3) is provided with a vacuum tube (31). The other end of the vacuum tube (31) passes through the drying box (1) and communicates with the vacuum chamber (15) for pumping vacuum for the vacuum chamber (15).
8. A vacuum freeze dryer according to claim 7, characterized in that: A drying device for heating the vacuum chamber (15) is provided inside the drying box (1). Heat dissipation slots (16) for dissipating residual heat are provided at both ends of the side wall of the drying box (1).
9. A vacuum freeze dryer according to claim 8, characterized in that: A display screen (11) for displaying the drying state is provided at the front end of the outer surface of the drying box (1). A traveling device (12) for moving the drying box (1) is provided at the bottom of the drying box (1).