Nano cellulose drying device of fuel cell
By introducing a temperature control circuit and an electric push rod into the nanocellulose drying equipment, the height of the air outlet of the heating shell is automatically adjusted, which solves the problem of unstable drying caused by temperature fluctuations and ensures the quality and performance of the finished nanocellulose product.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YIWU INDAL & COMMERICAL COLLEGE
- Filing Date
- 2025-04-09
- Publication Date
- 2026-05-12
AI Technical Summary
Existing nanocellulose drying equipment suffers from structural limitations and temperature fluctuations, leading to unstable drying effects. This can result in carbonization of nanocellulose or reduced hydroxyl activity, damaging its hierarchical pore structure and affecting its mechanical strength and specific surface area.
The system employs a temperature control circuit and an electric push rod to work together to automatically detect the surface temperature of the nanocellulose and adjust the height of the air outlet of the heating shell to ensure that the temperature is within a suitable range and prevent the adverse effects of excessively high or low temperatures on the drying process.
Automatic temperature control during the drying process of nanocellulose was achieved, ensuring the quality of the finished product, avoiding the adverse effects of temperature fluctuations on nanocellulose, and improving the drying effect, mechanical strength, and specific surface area of the finished product.
Smart Images
Figure CN224230593U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drying equipment technology, and in particular to a nanocellulose drying device for fuel cells. Background Technology
[0002] Nanocellulose, due to its high specific surface area, mechanical strength, and modifiability, is often used as a reinforcing material in the gas diffusion layer (GDL) of fuel cells or as a modifying additive in the proton exchange membrane (PEM). In these applications, it improves gas / proton transport efficiency and enhances electrode mechanical stability by optimizing the pore structure. Before application, nanocellulose needs to be dried. The drying process controls the physical structure (porosity, specific surface area) and chemical properties (functional groups, stability) of nanocellulose to achieve efficient mass transfer, durable operation, and low-cost manufacturing in fuel cells. Various drying methods for nanocellulose include vacuum drying, freeze drying, and hot air drying, among which hot air drying is more commonly used due to its low cost and good drying effect.
[0003] In existing production processes, nanocellulose is continuously transported to the lower end of the drying mechanism in the middle of the conveyor frame via an electric conveyor line (usually an electric roller conveyor). The heat generated by the drying mechanism then acts on the nanocellulose to dry it. While the existing drying mechanism meets the drying requirements to some extent, it still has some technical problems that urgently need improvement due to its structural limitations. Specifically, because the hot air outlet of the drying mechanism is at a fixed height, voltage fluctuations or other factors affecting the heat output can negatively impact the drying effect. For example, excessively high or low voltage fluctuations cause the temperature of the electric heating plate to rise or fall; too low a temperature results in insufficient drying of the nanocellulose, while too high a temperature leads to carbonization or reduced hydroxyl activity, damaging its hierarchical pore structure and reducing the specific surface area (<200m²). 2 / g) and mechanical strength (elastic modulus drops to below 80GPa). Utility Model Content
[0004] To overcome the shortcomings of existing drying equipment for nanocellulose applications, which are limited by structure and have the drawbacks described in the background, this utility model provides a nanocellulose drying device for fuel cells that can automatically detect the temperature of nanocellulose under the combined action of related structures. When the temperature is too high or too low, it can automatically adjust the height of the high or low heat outlet to minimize the adverse effects of excessively high or low temperatures on the drying process of nanocellulose and ensure the quality of the finished product.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A nanocellulose drying device for fuel cells includes an electric roller conveyor, an electric heating mechanism, a heating shell, an electric push rod, a temperature switch, and a temperature control circuit. The electric heating mechanism includes a fan, a shell, and an electric heating tube. The electric heating tube is installed inside the shell. An exhaust pipe and an inlet pipe are respectively installed on both sides of the shell. The exhaust pipe of the fan is connected to the inlet pipe. The fan and the shell are installed at the rear end of the frame of the electric roller conveyor. A connecting pipe is installed at the upper end of the heating shell. The upper part of the movable rod of the electric push rod is installed together with the lower part of the heating shell. The cylinder of the electric push rod is installed at the upper end of the frame. The temperature control circuit is installed in the electrical control box, and the temperature switch is installed on the inner side of the rear end of the frame. The power output terminal of the temperature control circuit is electrically connected to the power input terminal of the electric push rod, and the two ends of the temperature switch are electrically connected to the two signal input terminals of the temperature control circuit.
[0007] Furthermore, the lower surface of the heating shell is provided with multiple air vents, and the upper end of the electric roller conveyor and the lower end of the heating shell are spaced apart.
[0008] Furthermore, the temperature sensing surface of the temperature switch is located at the lower end of the air outlet of the heating shell.
[0009] Furthermore, the connecting pipe of the heating shell is connected to the air outlet pipe of the outer shell.
[0010] Furthermore, there are two identical temperature control circuits. Each temperature control circuit includes an electrically connected resistor, a transistor, and a relay. One end of the first resistor is connected to one end of the second resistor and one end of the third resistor. The other end of the third resistor is connected to the base of the transistor. The emitter of the transistor is connected to the other end of the second resistor and the negative control power input terminal of the relay. The collector of the transistor is connected to the negative power input terminal of the relay. The positive power input terminal of the relay is connected to the positive control power input terminal.
[0011] Compared with existing technologies, the advantages of this invention are: the temperature control circuit and temperature switch of this invention can collaboratively detect the temperature of the air output by the electric heating mechanism, that is, it can automatically detect the temperature of the nanocellulose. When the temperature is too high or too low, it can automatically adjust the height of the air outlet of the high or low heating shell via an electric push rod, thus minimizing the adverse effects of excessively high or low temperatures on the drying process of nanocellulose and ensuring the quality of the finished product. Based on the above, this invention has good application prospects. Attached Figure Description
[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0014] Figure 2 ,3 This is a partial structural schematic diagram of the present invention;
[0015] Figure 4 This is the circuit diagram of this utility model. Detailed Implementation
[0016] Figures 1-4 As shown, the nanocellulose drying device for fuel cells includes a power module Z1, an electric roller conveyor 1 (4KW), an electric heating mechanism, a heating shell 2, an electric push rod M1, a temperature switch RT, and a temperature control circuit 3. The electric heating mechanism includes a fan M, a sealed metal shell 41, and an electric heating tube RT. The electric heating tube RT is insulated and sealed inside the middle of the shell 41. An exhaust pipe 42 and an inlet pipe 43 are welded to the middle of the left and right sides of the shell 41, respectively. The exhaust pipe of the fan M and the inlet pipe 43 are connected by a pipe. The fan and the shell are fixedly installed at the rear end of the frame of the electric roller conveyor 1. The lower middle part; the rectangular heating shell 2 is a hollow structure. A connecting pipe 21 that communicates with its interior is welded to the upper end of the heating shell 2. There are two sets of electric push rods M1. The upper part of the movable rod of the two sets of electric push rods M1 and the lower front and rear ends of the heating shell 2 (the width is about 65 cm, the conveyor speed is relatively slow, and the raw material can be effectively dried when it passes through the lower end of the heating shell) are fixed together. The outer side of the lower end of the cylinder of the two sets of electric push rods M1 is fixedly installed on the front and rear sides of the upper part of the middle of the frame. The power module Z1 and the temperature control circuit 3 are installed in the electrical control box 5. The temperature switch RT is fixedly insulated and installed on the inner side of the rear end of the frame. The power input terminals 1 and 2 of the power module Z1, the fan M, and the electric heating element RT are connected in series with the main power switch and the two poles of the AC power supply via wires. The power output terminals 3 and 4 of the power module Z1 are connected to the power input terminals of the temperature control circuit, specifically the positive power input terminal of relay J1 and the emitter of transistor T1 and relay J2, and the emitter of transistor T2 via wires. The two normally open contacts of relay J1 and the two normally closed contacts of relay J2 are connected to the positive and negative and negative and positive and negative and positive and negative and positive and negative and positive and negative and negative and positive and negative and negative and negative and negative and negative and negative and negative and negative and negative and negative and negative and negative and negative and negative and negative and negative and positive and negative and negative and negative and positive and negative and negative and positive and negative and negative and positive and negative and negative and positive and negative and negative and positive and negative and negative and positive and negative and negative and positive and negative and positive and negative and negative and positive and negative and positive and negative and negative and positive and negative and positive and negative and negative and positive and negative and positive and negative and positive and negative and positive and negative and positive and negative and positive and two ends of the temperature switch RT are connected to the two signal input relays J1 and J2 of the two temperature control circuits and the other end of resistors R1 and R4 via wires.
[0017] Figures 1-4As shown, the lower surface of the heating shell 2 has multiple air vents 22, and the upper end of the roller of the electric roller conveyor 1 is spaced apart from the lower end of the heating shell 2. The temperature sensing surface of the temperature switch RT is located below the air vents 22 of the heating shell 2. The connecting pipe 21 of the heating shell and the air vent pipe 42 of the outer shell are connected by a pipe. The first temperature control circuit includes resistors R1, R2, and R3, transistor T1, and relay J1 connected by circuit board wiring. One end of the first resistor R1 is connected to one end of the second resistor R3 and one end of the third resistor R2. The other end of the third resistor R2 is connected to the base of transistor T1. The emitter of transistor T1 is connected to the other end of the second resistor R3 and the negative control power input terminal of relay J1. The collector of transistor T1 is connected to the negative power input terminal of relay J1. The positive power input terminal and the positive control power input terminal of relay J1 are connected. The second temperature control circuit includes resistors R3, R4, and R5 connected via circuit board wiring, transistor T2, and relay J2. One end of the first resistor R4 is connected to one end of the second resistor R5 and one end of the third resistor R6. The other end of the third resistor R6 is connected to the base of transistor T2. The emitter of transistor T2 is connected to the other end of the second resistor R5 and the negative control power input terminal of relay J2. The collector of transistor T2 is connected to the negative power input terminal of relay J2. The positive power input terminal and the positive control power input terminal of relay J2 are connected.
[0018] Figures 1-4 As shown, during operation, the electric roller conveyor 1 continuously transports nanocellulose to the lower end of the heating shell on the frame of the electric roller conveyor 1. The heat emitted from the lower end of the air outlet 22 of the heating shell acts on the nanocellulose, performing a drying process (this is mature technology and will not be elaborated upon in this application). AC 220V power is supplied to the power module Z1 (the power output terminal of the power module Z1 outputs a stable DC 12V power supply to the power input terminal of the temperature control circuit) and the power input terminals of the electric heating plate RT and the fan M. The electric heating plate RT is energized and heats up. The fan M, after being energized, outputs flowing air into the outer shell 41, carrying away the heat emitted by the electric heating plate RT into the heating shell 2. The hot air is evenly discharged from the lower end of the multiple air outlets 22 at the bottom of the heating shell, drying the surface of the nanocellulose on the rollers of the electric roller conveyor 1. In practice, the heat output from the air outlet at the bottom of the heating shell 2 acts on the temperature switch RT; the greater the heat, the greater the resistance value, and vice versa.
[0019] Figures 1-4As shown, when the maximum heat output from the lower end of the heating shell is appropriate (e.g., not higher than 80℃, so as not to affect the drying of the nanocellulose surface), the resistance value of the thermistor RT is relatively large, and the voltage division between it and resistors R1 and R3 is relatively large. Thus, the 12V power supply is divided by the thermistor RT and resistors R1 and R3, and the voltage is reduced and the current is limited by resistor R2, which enters the base of transistor T1 below 0.7V. Transistor T1 will not conduct, relay J1 will be de-energized and will not engage, and its control power input terminal and normally open contact terminal will be open. The electric push rod M1 will not be energized and will not work, and the height of the heating shell will not change. When the maximum heat output from the lower end of the heating shell is too high (e.g., above 80℃, which may affect the drying of the nanocellulose surface), the resistance of the thermistor RT is relatively small, and the voltage division between it and resistors R1 and R3 is relatively small. Thus, the 12V power supply, through the thermistor RT and resistors R1 and R3, and the voltage drop and current limiting effect of resistor R2, enters the base of transistor T1, where the voltage is higher than 0.7V. Transistor T1 will then conduct, outputting a low-level signal to the negative power input terminal of relay J1. Relay J1 is energized and its control power input terminal and normally open contact terminal close. When the electric actuator M1 is energized at its positive and negative power input terminals, its movable column will cause the heating shell to rise. As the height increases, the temperature acting on the temperature switch RT and the nanocellulose will decrease. When the maximum heat output from the lower end of the heating shell is appropriate again (e.g., not higher than 80°C), the resistance value of the thermistor RT will be relatively large again, and the voltage drop between it and the resistor R1 will be relatively large again. As a result, the relay J1 will be de-energized again, and the electric actuator M1 will be de-energized again. The lower end of the heating shell will maintain an appropriate height to heat and dry the surface of the nanocellulose. When the minimum heat output from the lower end of the heating shell is appropriate (e.g., not lower than 75℃, so as not to affect the drying of nanocellulose), the resistance value of the thermistor RT is relatively small, and the voltage drop between it and resistor R1 is relatively small. Thus, the 12V power supply is divided by the thermistor RT and resistors R4 and R5, and the voltage is reduced and current limited by resistor R6, which enters the base of transistor T2 below 0.7V. Transistor T2 will conduct, and the collector outputs a low level, which enters the negative power input terminal of relay J2. Relay J2 is energized and its control power input terminal and normally closed contact terminal are open. The electric push rod M1 will not be energized and will not work, and the height of the heating shell will not change.When the minimum heat output from the lower end of the heating shell is inappropriate (e.g., below 75℃, which would affect the drying of the nanocellulose surface), the resistance of the thermistor RT is relatively large, resulting in a relatively large voltage division between it and resistor R4. Thus, the 12V power supply, after being divided by the thermistor RT and resistors R4 and R5, and then reduced and current-limited by resistor R6, enters the base of transistor T2 when it falls below 0.7V. Transistor T2 will then cut off, and the collector output will no longer be low-level, entering the negative power input terminal of relay J2. Relay J2 will then be de-energized and will no longer engage, closing its control power input terminal and normally closed contact. When the two sets of electric push rods M1 are energized at their positive and negative power input terminals, their movable columns cause the heating shell to descend. As the height decreases, the temperature acting on the temperature switch RT and the nanocellulose increases. When the minimum heat output from the lower end of the heating shell is again appropriate (e.g., not lower than 75°C), the resistance of the thermistor RT becomes relatively low again, and the voltage drop between it and resistor R4 becomes relatively small. This re-energizes relay J2, de-energizes the positive and negative power input terminals of the electric push rods M1, and the lower end of the heating shell maintains a suitable height for heating and drying the nanocellulose. Through this process, this novel device can collaboratively detect the temperature of the nanocellulose and automatically adjust the height of the air outlet of the heating shell if the temperature is too high or too low, minimizing the adverse effects of excessively high or low temperatures on the drying process and ensuring the quality of the finished product. Figure 4 As shown, power module W1 is a finished product of AC 220V to DC 24V power module; electric actuator M1 is a finished product of reciprocating electric telescopic actuator with a power of 20W; electric heating element RT is a finished product of stainless steel armored dry-burning electric heating element with a power of 4KW; fan M has a power of 800W; resistors R1, R2, R3, R4, R5, and R6 have resistance values of 100K, 12.5K, 10K, 100K, 12K, and 10K respectively; transistors T1 and T2 are model 9013 (NPN); relays J1 and J2 are model DC12V; thermistor RT is a negative temperature coefficient thermistor of model MF52.
[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.
[0021] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A nanocellulose drying device for fuel cells, comprising an electric roller conveyor, an electric heating mechanism, a heating shell, an electric push rod, and a temperature switch, characterized in that, It also has a temperature control circuit; the electric heating mechanism includes a fan, a housing, and an electric heating tube, the electric heating tube being installed inside the housing, and an air outlet pipe and an air inlet pipe being installed on both sides of the housing respectively, the exhaust pipe of the fan being connected to the air inlet pipe, and the fan and the housing being installed at the rear end of the frame of the electric roller conveyor; a connecting pipe is installed at the upper end of the heating shell, the upper part of the movable rod of the electric push rod is installed together with the lower part of the heating shell, the cylinder of the electric push rod is installed at the upper end of the frame, the temperature control circuit is installed in the electrical control box, and the temperature switch is installed on the inner side of the rear end of the frame; the power output terminal of the temperature control circuit is electrically connected to the power input terminal of the electric push rod, and the two ends of the temperature switch are electrically connected to the two signal input terminals of the temperature control circuit respectively.
2. The nanocellulose drying device for fuel cells according to claim 1, characterized in that, The lower surface of the heating shell has multiple air vents, and the distance between the upper end of the roller of the electric roller conveyor and the lower end of the heating shell is [not specified].
3. The nanocellulose drying device for fuel cells according to claim 1, characterized in that, The temperature-sensing surface of the temperature switch is located at the lower end of the air outlet of the heating shell.
4. The nanocellulose drying device for fuel cells according to claim 1, characterized in that, The heating shell's connecting pipe is connected to the outer shell's air outlet pipe.
5. The nanocellulose drying device for fuel cells according to claim 1, characterized in that, There are two identical temperature control circuits. Each temperature control circuit includes an electrically connected resistor, a transistor, and a relay. One end of the first resistor is connected to one end of the second resistor and one end of the third resistor. The other end of the third resistor is connected to the base of the transistor. The emitter of the transistor is connected to the other end of the second resistor and the negative control power input terminal of the relay. The collector of the transistor is connected to the negative power input terminal of the relay. The positive power input terminal of the relay is connected to the positive control power input terminal.