An electrically assisted vacuum freeze-drying graphene oxide apparatus

Abstract

The application relates to the field of graphene oxide drying technology and discloses an electric auxiliary heating vacuum freeze drying graphene oxide equipment, which comprises a vacuum drying box, a vacuum pump box and a compressor box, the vacuum pump box and the compressor box are respectively provided with vacuumizing assemblies and refrigeration compressor groups, the vacuum drying box comprises a drying bin and a cold trap bin, the drying bin and the cold trap bin are communicated and air circulation is realized by installing a fan on adjacent partition plates, the inside of the drying bin further comprises a heating assembly and a graphene placing rack. The electric auxiliary heating vacuum drying can greatly shorten the drying time, the drying time can be shortened by 300%-400%, the electric auxiliary heating system is independent of the vacuum drying main system, the electric auxiliary heating system is flexible and convenient, the electric auxiliary heating temperature can be adjusted according to the drying condition, a heat insulation layer is arranged to prevent heat from being transferred to the vacuumizing assemblies and the refrigeration compressor groups, so that the system is prevented from working under over-temperature, and the graphene placing tray is more convenient to take through the setting of a discharging assembly.

Description

Technical Field

[0001] This application relates to the field of graphene oxide drying technology, and in particular to an electrically heated vacuum freeze-drying device for graphene oxide. Background Technology

[0002] Graphene is the thinnest, strongest, and most electrically and thermally conductive nanomaterial discovered to date. It is a novel material with a single-layer, sheet-like structure composed of carbon atoms. It is a two-dimensional material, only one atom thick, consisting of a hexagonal honeycomb lattice of carbon atoms arranged in sp2 hybrid orbitals. Simply put, graphene stacked layer by layer forms graphite; a 1-millimeter-thick piece of graphite contains approximately 3 million layers of graphene. Graphene possesses excellent optical, electrical, and mechanical properties, and holds significant promise for applications in materials science, micro / nano fabrication, energy, biomedicine, and drug delivery.

[0003] Graphene oxide is an oxide of graphene, possessing numerous oxygen-containing functional groups that make it more reactive than graphene, facilitating research on graphene modification targeting these functional groups. However, due to the inherent properties of graphene oxide, the moist graphene oxide product after pressure filtration has a high water content and poor flowability, generally requiring drying using vacuum freeze-drying equipment. The workflow of a vacuum freeze dryer mainly consists of three steps: pre-freezing, sublimation, and refreezing. First, the item to be freeze-dried is placed in a low-temperature environment to freeze into a solid. Then, under vacuum conditions, the ice in the item directly sublimates into water vapor; this process is called sublimation. Finally, through refreezing, the sublimated water vapor is re-frozen, thus obtaining the dried item.

[0004] However, conventional vacuum dryers rely on ambient heating to sublimate and dry the samples, which is a very inefficient method. In addition, in order to dry a large amount of graphene oxide at once, multiple trays are placed on each shelf, making it inconvenient to retrieve the trays at the back. Therefore, an electrically assisted heating vacuum freeze-drying device for graphene oxide is proposed to solve the above problems. Utility Model Content

[0005] To address the problems mentioned in the background art, this application provides an electrically assisted heating vacuum freeze-drying device for graphene oxide.

[0006] The electric-assisted heating vacuum freeze-drying equipment for graphene oxide provided in this application adopts the following technical solution:

[0007] An electrically assisted heating vacuum freeze-drying device for graphene oxide includes a vacuum drying chamber, a vacuum pump chamber, and a compressor chamber. The vacuum pump chamber and compressor chamber are respectively equipped with a vacuuming component and a refrigeration compressor unit. The vacuum drying chamber includes a drying chamber and a cold trap chamber, which are connected and air circulation is achieved by installing fans on adjacent partitions. The drying chamber also includes a heating component and graphene placement racks. The graphene placement racks are multi-layered, with a pull-out component installed on the surface of each layer, and multiple graphene placement trays on the surface of each layer. The vacuuming component and refrigeration compressor unit are both installed on one side of the vacuum drying chamber. A cold trap evaporator is installed inside the cold trap chamber and connected to the refrigeration compressor unit via pipelines. The vacuuming component is connected to the drying chamber. The vacuum drying chamber is double-layered, with a heat insulation layer between the two layers.

[0008] Preferably, the heating assembly includes a temperature control module, an electric heating element, and a temperature sensor, with an electric heating element and a temperature sensor installed inside each layer of graphene placement rack.

[0009] Preferably, the heat insulation layer is made of aerogel material.

[0010] Preferably, the pull-out assembly includes two pull rods, which are slidably connected to the surface of the graphene placement frame through multiple fixed sleeves, and each end of the two pull rods is provided with a connecting rod and a crossbar.

[0011] Preferably, the connecting rod is located inside the drying chamber and near the cold trap chamber, and multiple push plates are connected below the connecting rod to move the graphene placement tray.

[0012] Preferably, the surface of the drying chamber is equipped with an air filling valve, and a vacuum gauge is installed inside it.

[0013] In summary, this application includes the following beneficial technical effects:

[0014] This invention incorporates electric auxiliary heating vacuum drying, which can significantly shorten drying time by 300%-400%. The electric auxiliary heating system is independent of the vacuum drying host system, making it flexible and convenient. The electric auxiliary heating temperature can be adjusted according to the drying conditions. An insulation layer is set to prevent heat transfer to the vacuum pumping components and refrigeration compressor unit, which could cause the system to overheat. At the same time, the pull-out component makes it easier to pick up and remove the graphene tray. Attached Figure Description

[0015] Figure 1 This is an external perspective view of an electrically assisted heating vacuum freeze-drying device for graphene oxide according to this application;

[0016] Figure 2 This is a partial top sectional view of an electrically assisted heating vacuum freeze-drying device for graphene oxide according to this application;

[0017] Figure 3 This is an overall structural diagram of the pull-out component in an electrically assisted heating vacuum freeze-drying graphene oxide device of this application;

[0018] Figure 4 This is an enlarged view of section A of an electrically assisted heating vacuum freeze-drying device for graphene oxide according to this application.

[0019] Explanation of reference numerals in the attached drawings: 1. Vacuum drying oven; 101. Drying chamber; 102. Cold trap chamber; 103. Insulation layer; 2. Vacuum pump box; 3. Compressor box; 4. Cold trap evaporator; 5. Electric heating tube; 6. Temperature sensor; 7. Pull-out assembly; 701. Pull rod; 702. Connecting rod; 703. Crossbar; 704. Push plate; 8. Graphene placement rack; 9. Graphene placement tray; 10. Inflation valve; 11. Fixing sleeve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example

[0022] like Figure 1 - Figure 4 As shown, this application discloses an electrically assisted heating vacuum freeze-drying device for graphene oxide, comprising a vacuum drying chamber 1, a vacuum pump chamber 2, and a compressor chamber 3. The vacuum pump chamber 2 and compressor chamber 3 are respectively equipped with a vacuum pumping assembly and a refrigeration compressor unit. The vacuum pumping assembly includes a vacuum pump and a vacuum solenoid valve, etc. The vacuum pump is connected to an external control system (this is prior art for vacuum cooling dryers). The refrigeration compressor unit includes a compressor, a condenser, an expansion valve, and refrigeration piping, etc., and is connected to a cold trap evaporator 4, which is prior art for refrigeration. The vacuum drying chamber 1 includes a drying chamber 101 and a cold trap chamber 102, which are connected and air circulation is achieved by installing fans on adjacent partitions.

[0023] The difference lies in the fact that the drying chamber 101 also includes a heating component and a graphene placement rack 8. The graphene placement rack 8 is multi-layered, and each layer of the graphene placement rack 8 is equipped with a pull-out component 7 to facilitate the removal of graphene placement trays 9 that are difficult to access from inside. Each layer of the graphene placement rack 8 is equipped with multiple graphene placement trays 9. The vacuum component and the refrigeration compressor unit are installed on one side of the vacuum drying chamber 1. The cold trap chamber 102 is equipped with a cold trap evaporator 4, which is connected to the refrigeration compressor unit through pipelines. The surface of the drying chamber 101 is equipped with an inflation valve 10, and a vacuum gauge is installed inside it. The heating component includes a temperature control module, an electric heating tube 5, and a temperature sensor 6. The temperature control module is electrically connected to the electric heating tube 5 and the temperature sensor 6. The temperature control module is independent of the vacuum freeze-drying control system in the prior art. The temperature control module is based on a PLC and emphasizes high precision and multi-channel control. Models such as Siemens, S7-1500 series, and Mitsubishi Q64TCTTN are all acceptable.

[0024] Each graphene placement rack 8 is equipped with an electric heating tube 5 and a temperature sensor 6. Solid sublimation requires heat, and electric heating supplements the heat needed for sublimation, which can accelerate the drying process. Electric auxiliary heating vacuum drying can significantly shorten the drying time by 300%-400%. At the same time, the independent electric auxiliary heating system is set up, which is flexible and convenient, and the electric auxiliary heating temperature can be adjusted according to the drying situation.

[0025] The vacuum assembly is connected to the drying chamber 101. The vacuum drying chamber 1 is double-layered, and a heat insulation layer 103 is set between the two layers. The heat insulation layer 103 is made of aerogel. Aerogel has good heat insulation effect and prevents heat from being transferred to the vacuum assembly and refrigeration compressor unit, causing the system to overheat. In particular, overheating of the compressor may cause damage. The normal operating temperature of the compressor is generally 25℃.

[0026] The pull-out assembly 7 includes two pull rods 701. The two pull rods 701 are slidably connected to the surface of the graphene placement rack 8 through multiple fixing sleeves 11. The two ends of the two pull rods 701 are respectively provided with connecting rods 702 and crossbars 703. The connecting rods 702 are located inside the drying chamber 101 and close to the cold trap chamber 102. Multiple push plates 704 are connected below the connecting rods 702 to push the graphene placement trays 9 to move. In actual use, when the graphene placement trays 9 at the front end of the graphene placement rack 8 are taken out, and the graphene placement trays 9 at the rear are too far away to be pulled out, the crossbars 703 in the pull-out assembly 7 can be pulled to drive the push plates 704 to move and push the graphene placement trays 9 inside to a position that is easy for people to reach and pick up.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An electrically assisted heating vacuum freeze-drying device for graphene oxide, comprising a vacuum drying chamber (1), a vacuum pump chamber (2), and a compressor chamber (3), wherein the vacuum pump chamber (2) and the compressor chamber (3) are respectively provided with a vacuum pumping assembly and a refrigeration compressor unit, characterized in that: The vacuum drying chamber (1) includes a drying chamber (101) and a cold trap chamber (102). The drying chamber (101) and the cold trap chamber (102) are connected and air circulation is achieved by installing fans on adjacent partitions. The interior of the drying chamber (101) also includes a heating component and a graphene placement rack (8). The graphene placement rack (8) is multi-layered. Each layer of the graphene placement rack (8) is equipped with a pull-out component (7) and multiple graphene placement trays (9) are provided on the surface of each layer of the graphene placement rack (8). The vacuuming component and the refrigeration compressor unit are both installed on one side of the vacuum drying chamber (1). The interior of the cold trap chamber (102) is equipped with a cold trap evaporator (4). The cold trap evaporator (4) is connected to the refrigeration compressor unit through a pipeline. The vacuuming component is connected to the drying chamber (101). The vacuum drying chamber (1) is double-layered and an insulation layer (103) is provided between the two layers.

2. The electrically assisted heating vacuum freeze-drying equipment for graphene oxide according to claim 1, characterized in that: The heating assembly includes a temperature control module, an electric heating tube (5) and a temperature sensor (6). Each layer of graphene placement rack (8) is equipped with an electric heating tube (5) and a temperature sensor (6).

3. The electrically assisted heating vacuum freeze-drying equipment for graphene oxide according to claim 1, characterized in that: The heat insulation layer (103) is made of aerogel material.

4. The electrically assisted heating vacuum freeze-drying equipment for graphene oxide according to claim 1, characterized in that: The pull-out assembly (7) includes two pull rods (701). The two pull rods (701) are slidably connected to the surface of the graphene placement rack (8) through multiple fixing sleeves (11). The two ends of the two pull rods (701) are respectively provided with connecting rods (702) and crossbars (703).

5. The electrically assisted heating vacuum freeze-drying equipment for graphene oxide according to claim 4, characterized in that: The connecting rod (702) is located inside the drying chamber (101) and close to the cold trap chamber (102). Multiple push plates (704) are connected below the connecting rod (702) to push the graphene placement tray (9) to move.

6. The electrically assisted heating vacuum freeze-drying equipment for graphene oxide according to claim 1, characterized in that: The surface of the drying chamber (101) is equipped with an inflation valve (10), and a vacuum gauge is installed inside it.

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