Temperature control system of vacuum freeze dryer

Abstract

The utility model discloses a temperature control system of a vacuum freeze dryer, and aims to provide the temperature control system of the vacuum freeze dryer, which can improve the heating operation efficiency and the assembly efficiency of temperature control and improve the freeze-drying quality. The drying device comprises a drying box which comprises a heating system. The heating system is connected with a medium transmission pipe, the heat transfer guide pipe is connected with the drying box, and the medium transmission pipe is connected with the heat transfer guide pipe; a drying cavity is formed in the drying box, and the heating partition plate is detachably connected with the drying cavity; the heat conduction pipe and the heating partition plate are provided with a heating cavity, the heat conduction pipe is detachably connected with the heating cavity, and the arrangement structure of the heat conduction pipe in the heating cavity is of a snakelike structure; one end of the butt joint pipe is hermetically connected with the heat conduction pipe, and the other end of the butt joint pipe is hermetically connected with the heat transfer conduit. The vacuum freeze dryer has the beneficial effects that the heating uniformity of the temperature control operation of the vacuum freeze dryer is realized; the sealing and operation stability is enhanced; the temperature control precision is high; the assembly operability is convenient; and the freeze-drying quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum freeze dryer technology, and in particular to a temperature control system for a vacuum freeze dryer. Background Technology

[0002] With the development of technology, there are now methods for the long-term preservation of fruits, meeting the need for extended storage while preserving their nutritional value. Currently, freeze dryers are primarily used to achieve this. A freeze dryer is a mechanical device that uses heat energy to reduce the moisture content of materials. Fresh fruits are sliced ​​or diced and then passed through the alternating hot and cold mechanisms of the freeze dryer, causing them to gradually lose moisture and become crisp. The fruits must be placed on trays within the freeze dryer.

[0003] Chinese Patent Publication No.: CN 106482454 B, Publication Date: April 12, 2019. This invention proposes a vacuum freeze-drying system and its drying method. The drying system includes a freeze-drying chamber, a water vapor condenser, a vacuum system, a mechanical refrigeration system, and a thermoelectric system. The mechanical refrigeration system consists of a compressor, a liquid receiver, a condenser, an intercooler, a solenoid valve, a throttle valve, and a gas-liquid separator. The freeze-drying chamber and the water vapor condenser are connected through a gate valve for controlling the on / off state. The vacuum system is connected to the water vapor condenser to maintain the system vacuum. The mechanical refrigeration system provides cooling capacity to the freeze-drying chamber and the water vapor condenser. A material partition is provided inside the freeze-drying chamber. The thermoelectric system consists of a control terminal, a hot end, and a cold end. The hot end of the thermoelectric system is connected to the material partition, and the cold end is connected to the water vapor condenser. The shortcomings of this technical solution are: 1. Generally, the material partition is used as part of the temperature control system to heat the material after it is placed, but the uniformity of heating is difficult to guarantee, which affects the freeze-drying effect; 2. Since the material partition needs to be frequently picked up and put down, the connection efficiency between the material partition and the heating system of the vacuum freeze dryer is low due to the need for rapid operation, which affects the temperature control status of the entire process.

[0004] In summary, existing vacuum freeze dryers suffer from poor temperature control during heating and low assembly efficiency, which negatively impact freeze-drying quality. Utility Model Content

[0005] This invention aims to overcome the shortcomings of existing vacuum freeze dryers, such as poor heating effect and low assembly efficiency, which affect freeze-drying quality. It provides a temperature control system for a vacuum freeze dryer that improves heating efficiency and assembly efficiency, thereby enhancing freeze-drying quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A temperature control system for a vacuum freeze dryer, including

[0008] Drying oven, which includes a heating system;

[0009] The heat transfer conduit is connected to the heating system via a medium transmission pipe. The heat transfer conduit is connected to the drying oven, and the medium transmission pipe is connected to the heat transfer conduit.

[0010] Heating partition; the drying chamber is provided inside the drying oven; the heating partition is detachably connected to the drying chamber.

[0011] The heat pipe and heating baffle are equipped with a heating cavity. The heat pipe is detachably connected to the heating cavity. The arrangement of the heat pipe in the heating cavity is a serpentine structure.

[0012] The connecting pipe has one end sealed to the heat pipe and the other end sealed to the heat transfer pipe.

[0013] The drying chamber within the drying oven houses the heating baffles containing the materials. The drying oven contains a built-in heating system. This system uses a medium transfer pipe to introduce the heating medium into the heat transfer conduit, which then acts as a transition. After the heating baffle is inserted, the connecting pipe on the baffle inserts into the heat transfer conduit, establishing communication between the heating medium and the heat transfer pipes within the baffle. This allows the heating medium to transfer heat to the materials on the baffle, achieving temperature control. The heat transfer pipes are arranged in a meandering, serpentine structure to ensure more uniform heating of the baffles. The plug-and-play connection between the connecting pipe and the heat transfer conduit facilitates quick (indirect) connection and easy removal of the heating baffle from the heating system, reducing temperature change time during insertion and improving temperature control accuracy. The connecting pipe seals the heat transfer conduit and heating pipe, preventing medium leakage and improving the operational stability of the temperature control system. This achieves the effects of uniform heating, enhanced sealing and operational stability, high temperature control accuracy, and convenient assembly and operation in the vacuum freeze dryer, thereby improving the freeze-drying quality.

[0014] Preferably, the drying chamber is equipped with mounting base one and mounting base two, both with mounting openings. Mounting base one and mounting base two are each connected to mounting ears, which are bolted to the mounting opening. Both mounting base one and mounting base two have mounting holes and mounting screw holes. Heat transfer conduits are inserted into the mounting holes, and fixed flanges are fitted onto the heat transfer conduits, which are bolted to the mounting screw holes. The drying chamber is fixed to the mounting opening via the mounting ears of mounting base one and mounting base two, connecting the heat transfer conduits to both sides within the drying chamber. This allows for the input of the heat transfer medium in the heat transfer conduit of mounting base one and the output of the heat transfer medium in the heat transfer conduit of mounting base two. The heat transfer conduits are threadedly connected to the mounting screw holes via the fixed flanges to ensure stable connection, thereby ensuring stable connection between the heat transfer conduits and the medium transmission pipe of the heating system. The connecting pipes can be stably inserted and removed from the heat transfer conduits. This achieves the effect of improving the installation and use stability of the heat transfer conduits and ensuring stable delivery of the heat transfer medium.

[0015] Preferably, the heating baffle includes a panel and a base plate. The base plate has a recessed groove, on which the heating chamber is placed. The panel is fitted into the recessed groove. The base plate has a lifting groove that communicates with the recessed groove. A lifting block is connected to the panel and is fitted into the lifting groove. The heating baffle places the heat-conducting pipe through the recessed groove of the base plate. Simultaneously, the panel, by being embedded in the recessed groove, seals the heating chamber, allowing heat to accumulate within it. The lifting block, connected to the panel and embedded in the lifting groove, facilitates quick and easy opening of the heating baffle for maintenance and replacement of the heat-conducting pipe. This improves the assembly and maintenance efficiency of the temperature control system and ensures the stability and sustainability of the heating operation.

[0016] Preferably, a limiting tube is connected inside the heating cavity, and the limiting tube is connected to the bottom of the inner cavity of the heating cavity. The limiting tube is arranged in a serpentine structure, and the heat-conducting tube is inserted into the limiting tube. The arrangement of the limiting tube within the heating cavity allows for the placement and positioning of the heat-conducting tube or a newly replaced heat-conducting tube. This further ensures the uniformity of heating the panel by the heat-conducting tube and improves assembly and maintenance efficiency.

[0017] Preferably, the base plate has a fixing hole that communicates with the recessed groove. The connecting pipe is inserted into the fixing hole, and one end of the connecting pipe is connected to a sealing seat. The sealing seat has an inlet cavity that communicates with the heat transfer conduit. The sealing seat is made of rubber. The base plate, through the fixing hole, allows one side of the connecting pipe to be placed outside the base plate and connected to the heat transfer conduit, while the other side is inserted into the base plate and connected to the heating pipe. The sealing seat improves the sealing performance and stress resistance of the connecting pipe with the heat transfer conduit, enabling the connecting pipe to withstand the force applied when the heating baffle is inserted. This ensures that the heat transfer medium inside the heat transfer conduit is stably transported into the inlet cavity of the connecting pipe. This achieves the effects of sealing performance between the connecting pipe and the heat transfer conduit, and stable transport of the heat transfer medium.

[0018] Preferably, the other end of the connecting pipe is connected to a second sealing seat. The second sealing seat has an outlet cavity that communicates with the inner cavity of the heat-conducting pipe. The heat-conducting pipe has a connection port, and the second sealing seat is inserted into the connection port. The second sealing seat is made of rubber. The other end of the connecting pipe is inserted into the connection port of the heat-conducting pipe through the second sealing seat, ensuring a tight and sealed connection. This allows the heating medium inside the connecting pipe to enter the heat-conducting pipe through the connection port. This achieves the effects of a tight connection between the connecting pipe and the heat-conducting pipe, and stable delivery of the heat transfer medium.

[0019] Preferably, the drying chamber is connected to a support base, and the support base is connected to a mounting plate. The mounting plate is bolted to the wall of the drying chamber. The support base has a limiting groove, and the heating baffle is inserted into the limiting groove. The drying chamber is connected to the support base via the mounting plate, and the limiting groove makes the support base L-shaped, allowing the heating baffle to be guided into the drying chamber, thereby improving the docking accuracy of the connecting pipe and the heat transfer pipe. This achieves the effect of improving the connection stability and docking accuracy of the heating baffle.

[0020] Preferably, the drying chamber is equipped with a positioning seat, which is connected to a second mounting plate. The second mounting plate is bolted to the wall of the drying chamber. The positioning seat has a positioning groove into which a positioning piece is inserted. The positioning piece is in contact with the heating baffle. The drying chamber is connected to the positioning seat via the second mounting plate. The positioning piece can move up and down within the positioning groove. After the heating baffle is fully inserted into the drying chamber, the positioning piece moves to abut against the outer side of the heating baffle, ensuring that the inner side of the heating baffle is properly aligned and will not move outwards and break, causing leakage of the heating medium or failure of temperature control. This achieves the effect of improving the stability and accuracy of the installation and alignment of the heating baffle, and ensuring smooth temperature control operation.

[0021] The beneficial effects of this utility model are: achieving uniform heating in the temperature-controlled operation of the vacuum freeze dryer; enhancing sealing and operational stability; improving freeze-drying quality by providing high temperature control accuracy and convenient assembly and operation; improving the assembly and maintenance efficiency of the temperature control system; ensuring the stability and sustainability of the heating operation of the temperature control system; ensuring the stability of heat transfer medium delivery; improving the stability and accuracy of the installation and connection of the heating partition; and ensuring the smooth operation of the temperature control process. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a schematic diagram of the interior of the drying chamber;

[0024] Figure 3 This is a cross-sectional view of the inside of the drying chamber;

[0025] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 This is a schematic diagram of the interior of heating chamber 7.

[0027] In the diagram: 1. Drying oven, 2. Heat transfer pipe, 3. Medium transfer pipe, 4. Heating baffle, 5. Drying chamber, 6. Heat conduction pipe, 7. Heating chamber, 8. Connecting pipe, 9. Mounting seat one, 10. Mounting seat two, 11. Mounting port, 12. Mounting ear, 13. Fixed flange, 14. Panel, 15. Base plate, 16. Recessed groove, 17. Lifting groove, 18. Lifting block, 19. Limiting pipe, 20. Sealing seat one, 21. Sealing seat two, 22. Support seat, 23. Mounting plate one, 24. Limiting slide groove, 25. Positioning seat, 26. Mounting plate two, 27. Positioning slide groove, 28. Positioning plate, 29. Push block. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of components illustrated in these embodiments do not limit the scope of this application. For ease of illustration, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, an element described as being “below” other elements or features would be positioned “up” other elements or features. Thus, the exemplary term “down” can include both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale. Techniques, processes, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, processes, and equipment should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be discussed further in subsequent figures.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0032] Example 1:

[0033] like Figure 1-4 As shown, a temperature control system for a vacuum freeze dryer includes a drying chamber 1, which includes a heating system; a heat transfer conduit 2, the heating system being connected to a medium transmission pipe 3, the heat transfer conduit 2 being connected to the drying chamber 1, and the medium transmission pipe 3 being connected to the heat transfer conduit 2; a heating partition 4, the drying chamber 1 having a drying cavity 5, the heating partition 4 being detachably connected to the drying cavity 5; a heat conduction pipe 6, the heating partition 4 having a heating cavity 7, the heat conduction pipe 6 being detachably connected to the heating cavity 7, the heat conduction pipe 6 being arranged in a serpentine structure within the heating cavity 7; and a connecting pipe 8, one end of the connecting pipe 8 being sealed to the heat conduction pipe 6, and the other end of the connecting pipe 8 being sealed to the heat transfer conduit 2.

[0034] like Figure 4 , 5As shown, the drying oven 1 is provided with mounting base 1 9 and mounting base 2 10. The drying oven 1 is provided with mounting port 11. Mounting ears 12 are connected to both mounting base 1 9 and mounting base 2 10. Mounting ears 12 are bolted to mounting port 11. Mounting base 1 9 and mounting base 2 10 are provided with mounting holes and mounting screw holes. Heat transfer pipe 2 is inserted into the mounting hole. Fixed flange 13 is sleeved on the heat transfer pipe 2. Fixed flange 13 is bolted to mounting screw hole.

[0035] like Figure 4 , 5 As shown, the heating partition 4 includes a panel 14 and a bottom plate 15. The bottom plate 15 is provided with a recessed groove 16. The heating chamber 7 is placed on the recessed groove 16. The panel 14 is embedded in the recessed groove 16. The bottom plate 15 is provided with a lifting groove 17. The lifting groove 17 is connected to the recessed groove 16. The panel 14 is connected with a lifting block 18. The lifting block 18 is embedded in the lifting groove 17.

[0036] like Figure 5 As shown, a limiting tube 19 is connected inside the heating chamber 7. The limiting tube 19 is connected to the bottom of the inner cavity of the heating chamber 7. The arrangement structure of the limiting tube 19 is serpentine. The heat conduction tube 6 is inserted into the limiting tube 19.

[0037] like Figure 4 , 5 As shown, the base plate 15 has a fixing hole that communicates with the recessed groove 16. The connecting pipe 8 is inserted into the fixing hole. One end of the connecting pipe 8 is connected to a sealing seat 20. The sealing seat 20 has an inlet cavity that communicates with the heat transfer pipe 2. The sealing seat 20 is inserted into the heat transfer pipe 2. The other end of the connecting pipe 8 is connected to a sealing seat 21. The sealing seat 21 has an outlet cavity that communicates with the inner cavity of the heat conduction pipe 6. The heat conduction pipe 6 has a connection port, and the sealing seat 21 is inserted into the connection port.

[0038] like Figure 2-4 As shown, the drying chamber 1 is connected to a support base 22, and the support base 22 is connected to an mounting plate 23. The mounting plate 23 is bolted to the cavity wall of the drying chamber 5. The support base 22 is provided with a limiting slide groove 24, and the heating partition 4 is inserted into the limiting slide groove 24.

[0039] like Figure 2-4 As shown, the drying chamber 5 is provided with a positioning seat 25, and the positioning seat 25 is connected to a mounting plate 26. The mounting plate 26 is bolted to the cavity wall of the drying chamber 5. The positioning seat 25 is provided with a positioning groove 27, and a positioning piece 28 is inserted into the positioning groove 27. The positioning piece 28 is attached to the heating partition 4.

[0040] like Figure 1-5 As shown: The base plate 15 is connected to a pusher block 29 to facilitate the operation of the heating partition.

[0041] The heating system adopts the existing heating system of the vacuum freeze dryer (not shown in the figure), and the heat transfer medium is steam. The heat transfer pipe 2 connected to the mounting base 19 is used for steam input. The steam is output through the medium transmission pipe 3 and enters the heat transfer pipe 2 on this side and then enters one end of the heat conduction pipe 6. The heat transfer pipe 2 on the mounting base 210 is used for steam discharge, so that the steam is output from the other end of the heat conduction pipe 6 through the heat transfer pipe 2 on this side.

[0042] The limiting tube 19 is made of a metal material with good thermal conductivity to ensure good temperature conduction. The drying oven 1 is hinged with a door.

[0043] In use: After the material is pre-cooled, it is laid on the panel 14. The heating baffle 4 is pushed into the drying chamber 5 along the limiting slide groove 24 until the connecting pipe 8 is inserted into the heat transfer pipe 2 through the sealing seat 1 20 and the sealing seat 21. The moving positioning piece 28 abuts against the heating baffle 4. The chamber door is closed and a vacuum is drawn. After vacuuming, the heating system is started. Steam is output from the medium transmission pipe 3 into the heat transfer pipe 2 and the heat conduction pipe 6 to raise the temperature of the heating baffle 4. The heat transfer pipe 2 on the other side outputs steam from the medium transmission pipe 3 to achieve circulation, thereby heating the material and causing the frozen liquid in the material to directly vaporize and complete the rod operation.

[0044] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A temperature control system for a vacuum freeze dryer, characterized in that, include Drying oven (1), the drying oven (1) includes a heating system; Heat transfer conduit (2), the heating system is connected to a medium transmission pipe (3), the heat transfer conduit (2) is connected to the drying oven (1), and the medium transmission pipe (3) is connected to the heat transfer conduit (2); Heating partition (4), the drying chamber (1) is provided with a drying cavity (5), the heating partition (4) and the drying cavity (5) are detachably connected; The heat pipe (6) is provided with a heating chamber (7) in the heating partition (4). The heat pipe (6) is detachably connected to the heating chamber (7). The arrangement of the heat pipe (6) in the heating chamber (7) is in a serpentine structure. Connector (8), one end of which is sealed to heat pipe (6), and the other end of which is sealed to heat transfer pipe (2).

2. The temperature control system for a vacuum freeze dryer according to claim 1, characterized in that, The drying oven (1) is provided with mounting base one (9) and mounting base two (10). The drying oven (1) is provided with mounting port (11). Mounting ears (12) are connected to mounting base one (9) and mounting base two (10). Mounting ears (12) are bolted to mounting port (11). Mounting base one (9) and mounting base two (10) are provided with mounting holes and mounting screw holes. The heat transfer pipe (2) is inserted into the mounting hole. The heat transfer pipe (2) is fitted with a fixing flange (13). The fixing flange (13) is bolted to the mounting screw hole.

3. The temperature control system for a vacuum freeze dryer according to claim 1, characterized in that, The heating partition (4) includes a panel (14) and a bottom plate (15). The bottom plate (15) is provided with a recessed groove (16). The heating chamber (7) is placed on the recessed groove (16). The panel (14) is embedded in the recessed groove (16). The bottom plate (15) is provided with a lifting groove (17). The lifting groove (17) is connected to the recessed groove (16). The panel (14) is connected with a lifting block (18). The lifting block (18) is embedded in the lifting groove (17).

4. The temperature control system for a vacuum freeze dryer according to claim 3, characterized in that, The heating chamber (7) is connected to a limiting tube (19), which is connected to the bottom of the inner cavity of the heating chamber (7). The limiting tube (19) is arranged in a serpentine structure, and the heat-conducting tube (6) is inserted into the limiting tube (19).

5. The temperature control system for a vacuum freeze dryer according to claim 4, characterized in that, The base plate (15) is provided with a fixing hole, which is connected to the recessed groove (16). The connecting pipe (8) is inserted into the fixing hole. One end of the connecting pipe (8) is connected to a sealing seat (20). The sealing seat (20) is provided with an inlet cavity, which is connected to the heat transfer pipe (2). The sealing seat (20) is inserted into the heat transfer pipe (2).

6. The temperature control system for a vacuum freeze dryer according to claim 5, characterized in that, The other end of the connecting pipe (8) is connected to a sealing seat two (21). The sealing seat two (21) has an outlet cavity, which is connected to the inner cavity of the heat-conducting pipe (6). The heat-conducting pipe (6) has a connection port, and the sealing seat two (21) is inserted into the connection port.

7. The temperature control system for a vacuum freeze dryer according to claim 1, characterized in that, The drying chamber (1) is connected to a support base (22), and the support base (22) is connected to an mounting plate (23). The mounting plate (23) is bolted to the cavity wall of the drying chamber (5). The support base (22) is provided with a limiting slide groove (24), and the heating partition (4) is inserted into the limiting slide groove (24).

8. The temperature control system for a vacuum freeze dryer according to claim 7, characterized in that, The drying chamber (5) is provided with a positioning seat (25), and the positioning seat (25) is connected to a mounting plate two (26). The mounting plate two (26) is bolted to the cavity wall of the drying chamber (5). The positioning seat (25) is provided with a positioning groove (27), and a positioning piece (28) is inserted into the positioning groove (27). The positioning piece (28) is attached to the heating partition (4).

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