Single-cabin multi-working-condition heating freeze-drying testing machine

Abstract

The utility model belongs to the technical field of freeze-drying testing machines, and particularly relates to a single-cabin multi-working-condition heating freeze-drying testing machine which comprises a drying cabin assembly, a refrigerating system, a vacuum system and a control system, the drying cabin assembly is connected with the refrigerating system through a pipeline, the drying cabin assembly is connected with the vacuum system through a pipeline, and the control system is connected with the vacuum system through a pipeline. The control system is electrically connected with the drying bin assembly, the refrigerating system and the vacuum system. According to the utility model, a plurality of heating plate main bodies are arranged in the same freeze-drying bin, and the temperature of each heating plate main body is independently controlled, so that a testing machine with different heating working conditions in a single bin is realized. The same material can be processed in the same freeze-drying process, the heating temperatures of all trays of materials are different, the optimal drying curve is found through comparison, and the test time and the test frequency are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of freeze-drying test machines, in particular to a single-cabin multi-working-condition heating freeze-drying test machine. Background Art

[0002] The food vacuum freeze drying technology is an internationally emerging advanced food drying technology that first freezes the water in the food into ice crystals based on the equilibrium relationship between the three phases of water: solid, liquid and gas. Under low temperature and low pressure conditions, the water in the food is directly converted from ice crystals into water vapor and discharged, thereby dehydrating the food. For example, the utility model patent with announcement number CN219976901U discloses a food vacuum freeze dryer, including a food vacuum freeze dryer body, wherein the lower four corners of the food vacuum freeze dryer body are respectively bolted with support seats; a sealing door is hinged on the front right side of the food vacuum freeze dryer body, and the front and rear inner sides of the food vacuum freeze dryer body are respectively provided with cooling and conveying pipe rack structures.

[0003] The existing food vacuum freeze drying test chamber generally has only one heating condition. To obtain the best heating curve for the material, multiple drying tests are required, which is time-consuming, labor-intensive and energy-wasting. Therefore, it is necessary to improve it. Utility Model Content

[0004] The utility model aims to provide a single-chamber multi-operating-mode heating freeze-drying test machine, which solves the above-mentioned problems existing in the existing food vacuum freeze-drying test machine.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a single-chamber multi-working condition heating freeze-drying testing machine, including a drying chamber assembly, a refrigeration system, a vacuum system and a control system, the drying chamber assembly and the refrigeration system are connected by a pipeline, the drying chamber assembly and the vacuum system are connected by a pipeline, and the control system is electrically connected to the drying chamber assembly, the refrigeration system and the vacuum system.

[0006] Preferably, the drying bin assembly includes a drying chamber body, a plurality of material trays are placed on the inner side of the drying chamber body, and a heating plate body is arranged above each material tray, a heating plate sensor is arranged on the left side of the heating plate body, a material temperature sensor is arranged on the lower left side of the heating plate body, a drying chamber air breaking valve is arranged on the left side of the drying chamber body, a vacuum sensor is arranged on the right side of the drying chamber body, a collector body is fixedly connected to the bottom of the drying chamber body, a collector vacuum interface is arranged on the right side of the collector body, a drain valve is arranged at the bottom of the collector body, a refrigeration coil in the collector is arranged on the inner side of the collector body, and an air outlet is arranged at one end of the refrigeration coil in the collector, the air outlet passes through the collector body and extends to the outside of the collector body, and a liquid inlet is arranged at the other end of the refrigeration coil in the collector, the liquid inlet passes through the collector body and extends to the outside of the collector body. During the freeze-drying process, the material in the tray absorbs the heat from the heating plate body, causing the moisture in the material to sublime into water vapor under a vacuum environment. The sublimated water vapor passes through the low-temperature refrigeration coil in the collector body and most of it condenses into ice on its surface, and the rest is pumped away by the vacuum system to complete the freeze-drying process. After freeze-drying is completed, the drying chamber air-breaking valve is opened to take out the material, and the ice on the collector coil is melted and discharged through the drain valve.

[0007] Preferably, the refrigeration system includes a refrigeration unit, the top of the refrigeration unit is provided with an air intake port connected through a pipeline, and the air intake port is fixedly connected to the air outlet, the top right side of the refrigeration unit is connected with a liquid supply port through a pipeline, the liquid supply port is fixedly connected to the liquid inlet, the front section of the pipeline of the liquid supply port is provided with a filter and a sight glass, the middle section of the pipeline of the liquid supply port is provided with a refrigeration electric magnetic valve, and the end section of the pipeline of the liquid supply port is provided with a refrigeration thermal expansion valve and a refrigeration manual valve. The refrigeration unit absorbs the refrigerant gas evaporated in the collector pipe through the air intake port, compresses and cools it into a high-pressure liquid, and the refrigerant evaporates in the collector pipe after throttling through the refrigeration thermal expansion valve to complete the cycle, thereby ensuring the temperature requirements of the collector body.

[0008] Preferably, the vacuum system includes a vacuum pump, an air pipe is provided at the output end of the vacuum pump, an air inlet is provided at the end of the air pipe, and the air inlet is fixedly connected to the vacuum interface of the collector, a vacuum electromagnetic pressure difference valve and a vacuum manual valve are provided at the front section of the air pipe, a branch pipe is provided at the front end of the air pipe and located at the vacuum electromagnetic pressure difference valve and the vacuum manual valve, and a solenoid valve and a vacuum fine-tuning valve are provided in the middle section of the branch pipe. When the vacuum degree is too low, the system is supplemented with air through the solenoid valve and the vacuum fine-tuning valve, and the opening of the vacuum fine-tuning valve is adjusted to adjust the amount of air supplement to achieve the required vacuum degree of the system.

[0009] Preferably, the control system includes an electrical control cabinet, and a touch-screen industrial computer is arranged on the front of the electrical control cabinet. The electrical control cabinet is equipped with control elements such as PLC and contactors, and a control program is compiled on the touch-screen industrial computer. Through the PLC and various control elements in the electrical control cabinet, the vacuum pump, compressor, heating plate body, and various solenoid valves are controlled to realize automatic control of the freeze-drying process.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] The utility model arranges a plurality of heating plate bodies in the same freeze-drying chamber and controls the temperature of each heating plate body individually, thereby realizing a test machine with different heating conditions in a single chamber. The same material can be processed in the same freeze-drying, and the heating temperature of each plate of material is different. The best drying curve can be found by comparison, thus saving test time and test times. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the freeze-drying chamber assembly of the utility model;

[0014] Figure 3 It is a schematic diagram of a refrigeration system of the utility model;

[0015] Figure 4 It is the vacuum system intention of the utility model;

[0016] Figure 5 It is a schematic diagram of the control system of the utility model.

[0017] In the figure: 1. Drying chamber assembly; 2. Refrigeration system; 3. Vacuum system; 4. Control system; 5. Drying chamber; 6. Heating plate sensor; 7. Heating plate body; 8. Material tray; 9. Material temperature sensor; 10. Vacuum sensor; 11. Collector body; 12. Collector vacuum interface; 13. Liquid inlet; 14. Drain valve; 15. Air outlet; 16. Drying chamber air-breaking valve; 17. Liquid supply port; 18. Refrigeration manual valve; 19. Refrigeration thermal expansion valve; 20. Refrigeration electric magnetic valve; 21. Sight glass; 22. Filter; 23. Refrigeration unit; 24. Air intake; 25. Air inlet; 26. Vacuum manual valve; 27. Solenoid valve; 28. Vacuum fine-tuning valve; 29. ​​Vacuum solenoid pressure differential valve; 30. Vacuum pump; 31. Electrical control cabinet; 32. Touch-screen industrial computer. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-5 A single-chamber multi-working condition heating freeze-drying testing machine includes a drying chamber assembly 1, a refrigeration system 2, a vacuum system 3 and a control system 4. The drying chamber assembly 1 is connected to the refrigeration system 2 through a pipeline, the drying chamber assembly 1 is connected to the vacuum system 3 through a pipeline, and the control system 4 is electrically connected to the drying chamber assembly 1, the refrigeration system 2 and the vacuum system 3.

[0020] See also Figure 1-2 The drying chamber assembly 1 includes a drying chamber body 5, a plurality of material trays 8 are placed inside the drying chamber body 5, and a heating plate body 7 is arranged above each material tray 8, a heating plate sensor 6 is arranged on the left side of the heating plate body 7, and a material temperature sensor 9 is arranged on the left side below the heating plate body 7, a drying chamber air-breaking valve 16 is arranged on the left side of the drying chamber body 5, a vacuum sensor 10 is arranged on the right side of the drying chamber body 5, and a collector body 11 is fixedly connected to the bottom of the drying chamber body 5, and the collector The right side of the main body 11 is provided with a trap vacuum interface 12, the bottom of the trap main body 11 is provided with a drain valve 14, the inner side of the trap main body 11 is provided with a trap internal refrigeration coil, and one end of the trap internal refrigeration coil is provided with an air outlet 15, the air outlet 15 penetrates the trap main body 11 and extends to the outside of the trap main body 11, and the other end of the trap internal refrigeration coil is provided with a liquid inlet 13, the liquid inlet 13 penetrates the trap main body 11 and extends to the outside of the trap main body 11. During the freeze-drying process, the material in the material tray 8 absorbs the heat of the heating plate main body 7 so that the water in the material sublimates into water vapor under a vacuum environment, and the sublimated water vapor passes through the low-temperature refrigeration coil in the trap main body 11 and condenses into ice on its surface, and the rest is drawn away by the vacuum system 3 to complete the freeze-drying process. After the freeze-drying is completed, the drying chamber air-breaking valve 16 is opened to take out the material, and the ice on the trap coil is melted and discharged through the drain valve 14.

[0021] See also Figure 1 , Figure 3The refrigeration system 2 includes a refrigeration unit 23. The top of the refrigeration unit 23 is provided with an air intake port 24 connected through a pipeline, and the air intake port 24 is fixedly connected to the air outlet 15. The top right side of the refrigeration unit 23 is connected with a liquid supply port 17 through a pipeline, and the liquid supply port 17 is fixedly connected to the liquid inlet 13. The front section of the pipeline of the liquid supply port 17 is provided with a filter 22 and a sight glass 21, the middle section of the pipeline of the liquid supply port 17 is provided with a refrigeration electric magnetic valve 20, and the end section of the pipeline of the liquid supply port 17 is provided with a refrigeration thermal expansion valve 19 and a refrigeration manual valve 18. The refrigeration unit 23 absorbs the refrigerant gas evaporated in the collector pipe through the air intake port 24, compresses and cools it to become a high-pressure liquid, and the refrigerant evaporates in the collector pipe after throttling through the refrigeration thermal expansion valve 19 to complete the cycle, thereby ensuring the temperature requirement of the collector body 11.

[0022] See also Figure 1 , Figure 4 The vacuum system 3 includes a vacuum pump 30, an air pipe is provided at the output end of the vacuum pump 30, an air inlet 25 is provided at the end of the air pipe, and the air inlet 25 is fixedly connected to the vacuum interface 12 of the collector, a vacuum electromagnetic pressure difference valve 29 and a vacuum manual valve 26 are provided at the front section of the air pipe, a branch pipe is provided at the front end of the air pipe and located at the vacuum electromagnetic pressure difference valve 29 and the vacuum manual valve 26, and a solenoid valve 27 and a vacuum fine-tuning valve 28 are provided in the middle section of the branch pipe. When the vacuum degree is too low, the system is supplemented with air through the solenoid valve 27 and the vacuum fine-tuning valve 28, and the opening size of the vacuum fine-tuning valve 28 is adjusted to adjust the air supplement amount to achieve the required vacuum degree of the system.

[0023] See also Figure 1 , Figure 5 The control system 4 includes an electrical control cabinet 31. A touch-screen industrial computer 32 is arranged on the front of the electrical control cabinet 31. The electrical control cabinet 31 is equipped with control elements such as PLC and contactors. A control program is compiled in the touch-screen industrial computer 32. Through the PLC and various control elements in the electrical control cabinet 31, the vacuum pump 30, the compressor, the heating plate body 7, and various solenoid valves 27 are controlled to realize automatic control of the freeze-drying process.

[0024] The specific implementation process of the utility model is as follows: by placing the materials in each material tray 8 in turn, and then putting the material tray 8 containing the materials into the drying chamber 5, and then the materials in the material tray 8 are in the freeze-drying process, the materials absorb the heat of the heating plate body 7 so that the water in the materials sublimates into water vapor under a vacuum environment, and the sublimated water vapor passes through the low-temperature refrigeration coil in the collector body 11, and most of it condenses into ice on its surface, and the rest is drawn away by the vacuum system 3 to complete the freeze-drying process. After the freeze-drying is completed, the drying chamber air-breaking valve 16 is opened to take out the materials, and the ice on the collector coil is melted and discharged through the drain valve 14;

[0025] In addition, the refrigeration unit 23 absorbs the refrigerant gas evaporated in the collector pipe through the air intake port 24, compresses and cools it to become a high-pressure liquid, and the refrigerant evaporates in the collector pipe after throttling through the refrigeration thermal expansion valve 19 to complete the cycle, thereby ensuring the temperature requirement of the collector body 11. When the vacuum degree is too low, the system is replenished with air through the solenoid valve 27 and the vacuum fine-tuning valve 28, and the opening size of the vacuum fine-tuning valve 28 is adjusted to adjust the amount of air replenishment to achieve the required vacuum degree of the system.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single-chamber multi-operating-condition heating freeze-drying test machine, comprising a drying chamber assembly (1), a refrigeration system (2), a vacuum system (3) and a control system (4), characterized in that: The drying bin assembly (1) is connected to the refrigeration system (2) via a pipeline, the drying bin assembly (1) is connected to the vacuum system (3) via a pipeline, and the control system (4) is electrically connected to the drying bin assembly (1), the refrigeration system (2) and the vacuum system (3); The drying chamber assembly (1) comprises a drying chamber body (5), a plurality of material trays (8) are placed inside the drying chamber body (5), and a heating plate body (7) is arranged above each material tray (8), a heating plate sensor (6) is arranged on the left side of the heating plate body (7), a material temperature sensor (9) is arranged on the left side below the heating plate body (7), a drying chamber air release valve (16) is arranged on the left side of the drying chamber body (5), a vacuum sensor (10) is arranged on the right side of the drying chamber body (5), and a collector body (11) is fixedly connected to the bottom of the drying chamber body (5). A collector vacuum interface (12) is provided on the right side of the collector body (11), a drain valve (14) is provided at the bottom of the collector body (11), a collector internal refrigeration coil is provided on the inner side of the collector body (11), and an air outlet (15) is provided at one end of the collector internal refrigeration coil, the air outlet (15) passes through the collector body (11) and extends to the outside of the collector body (11), and a liquid inlet (13) is provided at the other end of the collector internal refrigeration coil, the liquid inlet (13) passes through the collector body (11) and extends to the outside of the collector body (11); The refrigeration system (2) comprises a refrigeration unit (23), the top of the refrigeration unit (23) is provided with an air intake port (24) connected via a pipeline, and the air intake port (24) is fixedly connected to the air outlet port (15), the right side of the top of the refrigeration unit (23) is connected to a liquid supply port (17) via a pipeline, the liquid supply port (17) is fixedly connected to the liquid inlet port (13), the front section of the pipeline of the liquid supply port (17) is provided with a filter (22) and a sight glass (21), the middle section of the pipeline of the liquid supply port (17) is provided with a refrigeration electric magnetic valve (20), and the end section of the pipeline of the liquid supply port (17) is provided with a refrigeration thermal expansion valve (19) and a refrigeration manual valve (18); The vacuum system (3) comprises a vacuum pump (30), an air pipe is provided at the output end of the vacuum pump (30), an air inlet (25) is provided at the end of the air pipe, and the air inlet (25) is fixedly connected to the vacuum interface (12) of the collector, a vacuum electromagnetic pressure difference valve (29) and a vacuum manual valve (26) are provided at the front section of the air pipe, a branch pipe is provided at the front end of the air pipe and located between the vacuum electromagnetic pressure difference valve (29) and the vacuum manual valve (26), and a solenoid valve (27) and a vacuum fine-tuning valve (28) are provided in the middle section of the branch pipe; The control system (4) comprises an electrical control cabinet (31), and a touch-screen industrial control computer (32) is arranged on the front of the cabinet of the electrical control cabinet (31).

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