A constant temperature and humidity system for electrospinning

Abstract

The utility model relates to a constant temperature and humidity system for electrostatic spinning, including a spinning cavity, a temperature and humidity control device arranged outside the spinning cavity, an air intake device, a return air duct and a control cabinet; the gas input end of the temperature and humidity control device is connected to the output end of the air intake device, and the gas output end of the temperature and humidity control device is connected to the air inlet of the spinning cavity; the output end of the return air duct is connected to the input end of the temperature and humidity control device, and the input end of the return air duct is connected to the air outlet of the spinning cavity. The utility model uses multi-stage surface cooling and dehumidification to reduce the influence of absolute moisture content, solves the problem of unstable temperature through thyristor electric fins, and then supplements humidity to complete relatively stable temperature and humidity regulation to achieve the required temperature and humidity.

Description

Technical Field

[0001] The utility model relates to the field of electrostatic spinning, in particular to a constant temperature and humidity system for electrostatic spinning. Background Art

[0002] Electrospinning is a special fiber manufacturing process in which a polymer solution or melt is jet-spun in a strong electric field. Under the action of the electric field, the droplet at the needle tip changes from a sphere to a cone (i.e., a "Taylor cone"), and fiber filaments are extended from the tip of the cone. The above method can produce polymer filaments with nanometer diameters. Electrospinning has become a universal application technology in the biomedicine and medical device industries due to its simple manufacturing equipment, low spinning cost, a wide variety of spinnable materials, and controllable processes.

[0003] However, there are still some urgent problems to be solved in the electrospinning process. The equipment supporting the new industry has very high requirements for the precision control of indoor air temperature and humidity, and its temperature and humidity requirements are temperature ±1°C and humidity ±5%RH. The existing conventional temperature and humidity control systems cannot meet the requirements for the electrospinning process. Specifically, the existing supporting temperature and humidity systems have a large adjustment range, and the efficiency of heating, cooling, dehumidification and humidification is low, and the time consumption is relatively long; and the temperature and humidity adjustment accuracy is not high, the fluctuation is large, the energy consumption is relatively high, and it is easy to cause a lot of energy waste.

[0004] In addition, the existing technical solutions do not form a closed feedback loop between the constant temperature and humidity device and the spinning chamber, and directly set a fixed temperature and humidity to be input into the spinning chamber. When the environment in the spinning chamber changes, if the gas with a fixed temperature and humidity is still input into the spinning chamber, the temperature and humidity in the spinning chamber will deviate, affecting the spinning yield.

[0005] Therefore, it is extremely important to develop a constant temperature and humidity system for electrospinning. Utility Model Content

[0006] The utility model aims to provide a constant temperature and humidity system for electrostatic spinning, which solves the problem that the temperature and humidity cannot be adjusted with high precision in electrostatic spinning equipment.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A constant temperature and humidity system for electrospinning, comprising a spinning chamber, a temperature and humidity control device arranged outside the spinning chamber, an air intake device, a return air duct and a control cabinet; the gas input end of the temperature and humidity control device is connected to the output end of the air intake device, and the gas output end of the temperature and humidity control device is connected to the air inlet of the spinning chamber; the output end of the return air duct is connected to the input end of the temperature and humidity control device, and the input end of the return air duct is connected to the air outlet of the spinning chamber.

[0009] Furthermore, the temperature and humidity control device includes an evaporator, a compressor, a front condenser, a rear condenser, a front heating fin, a rear heating fin and a humidifier which are connected in sequence, the input end of the evaporator is connected to the output end of the air intake device, and the output end of the humidifier is connected to the air inlet of the spinning cavity.

[0010] The gas generated by the air intake device passes through the evaporator, compressor, front condenser, rear condenser, front heating fins, rear heating fins and humidifier of the temperature control device in sequence, thereby achieving temperature and humidity control of the gas entering the spinning chamber.

[0011] Furthermore, an exhaust fan is provided at the air outlet of the spinning cavity, and the exhaust fan is electrically connected to the output end of the control cabinet.

[0012] An exhaust fan is arranged at the air outlet of the spinning cavity to increase the air intake and exhaust volume of the spinning cavity when adjusting the temperature and humidity of the gas in the spinning cavity, thereby realizing rapid control of the temperature and humidity in the spinning cavity.

[0013] Furthermore, a temperature and humidity detection sensor is provided in the return air duct, the temperature and humidity detection sensor is electrically connected to the input end of the control cabinet, and the output end of the control cabinet is electrically connected to the electrical signal input end of the temperature and humidity control device.

[0014] The temperature and humidity detection sensor is installed in the return air duct, rather than being installed inside the spinning cavity as in the prior art, to reduce the influence of the working electric field on the temperature and humidity detection sensor.

[0015] Furthermore, a circulation fan is also provided in the return air duct, and an air inlet of the circulation fan is fluidly connected to an air outlet on the spinning cavity.

[0016] Furthermore, the control cabinet is provided with a human-computer interaction interface for human-computer interaction operation, and displays the temperature and humidity set values ​​and the temperature and humidity measured values ​​in real time.

[0017] Furthermore, a containing layer is arranged at the bottom of the spinning cavity, and a metal lining layer and a BOM insulating board layer are laid in the containing layer.

[0018] The setting of the metal lining and the BOM insulating board layer effectively solves the problem that the high-frequency power supply voltage used in the electrospinning equipment is easily affected by the electric field inside the spinning cavity, thereby reducing the spinning efficiency.

[0019] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0020] The constant temperature and humidity system for electrospinning involved in the utility model solves the problem of unstable temperature and humidity control of the electrospinning device; wherein each structure is arranged logically, effectively combining the high-precision temperature and humidity control system with the electrospinning device, effectively reducing the scrap rate of the product and greatly improving the production yield; in addition, combined with the return air process and coordinated with the components of each device, the response rate and the target accuracy are steadily improved, greatly reducing the influence of the electric field on the temperature sensing components. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0022] Figure 1 This is a device diagram of a constant temperature and humidity system for electrospinning according to an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the internal structure of a constant temperature and humidity system for electrospinning according to an embodiment of the utility model.

[0024] The reference numerals are described as follows:

[0025] 1. Spinning cavity; 2. Temperature and humidity control device; 21. Evaporator; 22. Compressor; 23. Front condenser; 24. Rear condenser; 25. Front heating fins; 26. Rear heating fins; 27. Humidifier; 3. Air intake device; 4. Return air duct; 41. Temperature and humidity detection sensor; 42. Circulating fan; 5. Control cabinet; 51. Human-computer interaction interface; 6. Accommodation layer; 61. Metal lining; 62. BOM insulation board layer. DETAILED DESCRIPTION

[0026] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0027] See also Figure 1 and Figure 2 As shown, the device of the constant temperature and humidity system for electrospinning involved in the embodiment of the utility model includes a spinning chamber 1, a temperature and humidity control device 2 arranged outside the spinning chamber 1, an air intake device 3, a return air duct 4 and a control cabinet 5; the gas input end of the temperature and humidity control device 2 is connected to the output end of the air intake device 3, and the gas output end of the temperature and humidity control device 2 is connected to the air inlet of the spinning chamber 1; the output end of the return air duct 4 is connected to the input end of the temperature and humidity control device 2, and the input end of the return air duct 4 is connected to the air outlet of the spinning chamber 1.

[0028] Among them, the temperature and humidity control device 2 includes an evaporator 21, a compressor 22, a front condenser 23, a rear condenser 24, a front heating fin 25, a rear heating fin 26 and a humidifier 27 which are connected in sequence, and the input end of the evaporator 21 is connected to the output end of the air intake device 3, and the output end of the humidifier 27 is connected to the air inlet of the spinning chamber 1.

[0029] An exhaust fan is also provided at the air outlet of the spinning chamber 1 , and the exhaust fan is electrically connected to the output end of the control cabinet 5 , which increases the air intake and exhaust volume in the spinning chamber 1 while adjusting the temperature and humidity of the processing gas in the spinning chamber 1 .

[0030] A temperature and humidity detection sensor 41 is also provided in the return air duct 4, and the temperature and humidity detection sensor 41 is electrically connected to the input end of the control cabinet 5, and the output end of the control cabinet 5 is electrically connected to the electrical signal input end of the temperature and humidity control device 2; the detection element is arranged in the return air duct 4 instead of being directly placed in the spinning cavity 1, thereby avoiding the influence of the electric field inside the spinning cavity 1 and improving the sensitivity and responsiveness of the detection element.

[0031] In addition, a containing layer 6 is provided at the bottom of the spinning cavity 1, and a metal lining layer 61 and a BOM insulating plate layer 62 are laid in the containing layer 6. The addition of the metal lining layer 61 and the BOM insulating plate 62 effectively blocks the electric field in the spinning cavity.

[0032] A circulation fan 42 is also provided in the return air duct 4 , and an air inlet of the circulation fan 42 is fluidically connected to an air outlet on the spinning cavity 1 .

[0033] The specific workflow is as follows:

[0034] S1: The air intake device 3 takes air from the clean room where the electrospinning equipment is located, and the air volume is controlled at 300m 3 / h or so;

[0035] S2: The temperature detection sensor 41 and the humidity detection sensor 42 detect the initial air intake temperature and humidity data, and record the initial temperature as 22±5°C and the initial humidity as 50±10%RH;

[0036] S3: The intake air is sequentially sent to the evaporator 21 and the front condenser 23 for cooling and dehumidification. The amount of refrigerant entering the front condenser 23 is controlled by the control cabinet 5 to maintain the condensation temperature at about 8°C. At this time, the intake air temperature is recorded to drop to about 12±2°C, and the humidity is maintained at about 95±10%RH;

[0037] S4: After being processed by the front condenser 23, the intake air is sent to the rear condenser 24. At this time, the recorded intake air temperature drops to about 8±2°C, and the humidity is maintained at 95±10%RH;

[0038] S5: After being processed by the rear condenser 24, the air enters the front heating fin 25, and the heating fin is controlled by the thyristor and the temperature sensor feedback to control the air intake temperature to rise to 20±2℃;

[0039] S6: The air intake through the front heating fins 25 is sent to the rear heating fins 26, and the air intake temperature is controlled to rise to 28±1°C.

[0040] S7: The air intake after temperature adjustment is linked to the humidifier 27 through the humidity feedback from the humidity sensor to control the humidity range to about 43±5%RH.

[0041] The temperature and humidity adjustment process of this embodiment is as follows: the temperature and humidity sensor 41 arranged in the return air duct 4 collects environmental parameters such as temperature and humidity in the spinning cavity 1 and converts them into electrical signals and transmits them to the control cabinet 5. The control cabinet 5 judges, based on the electrical signals, whether the temperature and humidity in the current spinning cavity 1 are higher or lower than the set temperature and humidity values ​​required for the electrostatic spinning operation, thereby controlling the temperature and humidity control device 2 to increase or decrease the temperature and humidity of the intake air, so that the temperature and humidity in the spinning cavity 1 are maintained at the set values, thereby achieving rapid adjustment of the temperature and humidity.

[0042] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A constant temperature and humidity system for electrospinning, characterized in that: The invention comprises a spinning chamber (1), a temperature and humidity control device (2) arranged outside the spinning chamber (1), an air intake device (3), a return air duct (4) and a control cabinet (5); the gas input end of the temperature and humidity control device (2) is connected to the output end of the air intake device (3), and the gas output end of the temperature and humidity control device (2) is connected to the air inlet of the spinning chamber (1); the output end of the return air duct (4) is connected to the input end of the temperature and humidity control device (2), and the input end of the return air duct (4) is connected to the air outlet of the spinning chamber (1).

2. A constant temperature and humidity system for electrospinning according to claim 1, characterized in that: The temperature and humidity control device (2) comprises an evaporator (21), a compressor (22), a front condenser (23), a rear condenser (24), a front heating fin (25), a rear heating fin (26), and a humidifier (27) which are connected in sequence, wherein the input end of the evaporator (21) is connected to the output end of the air intake device (3), and the output end of the humidifier (27) is connected to the air inlet of the spinning chamber (1).

3. A constant temperature and humidity system for electrospinning according to claim 1, characterized in that: An exhaust fan is provided at the air outlet of the spinning cavity (1), and the exhaust fan is electrically connected to the output end of the control cabinet (5).

4. A constant temperature and humidity system for electrospinning according to claim 1, characterized in that: A temperature and humidity detection sensor (41) is provided in the return air duct (4); the temperature and humidity detection sensor (41) is electrically connected to an input end of the control cabinet (5); and an output end of the control cabinet (5) is electrically connected to an electrical signal input end of the temperature and humidity control device (2).

5. A constant temperature and humidity system for electrospinning according to claim 4, characterized in that: A circulating fan (42) is also provided in the return air duct (4), and an air inlet of the circulating fan (42) is fluidically connected to an air outlet on the spinning cavity (1).

6. A constant temperature and humidity system for electrospinning according to claim 1, characterized in that: A containing layer (6) is provided at the bottom of the spinning cavity (1), and a metal lining layer (61) and a BOM insulating board layer (62) are laid in the containing layer (6).

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