Aluminum flat plate heat pipe capillary layer prefabricated member preparation system for photovoltaic cell

Abstract

The invention relates to an aluminum flat plate heat pipe capillary layer prefabricated part preparation system for a photovoltaic cell. A heating coil is wound on the outer side of a continuous calcining chamber, a door-shaped sintering tunnel is arranged in the continuous calcining chamber, the head end of the door-shaped sintering tunnel is communicated with a spiral output channel in a feeder, and the tail end of the door-shaped sintering tunnel is communicated with a door-shaped discharging channel in a discharging pipe; an inlet airtight box is arranged at the tail end of the continuous calcining chamber, an outlet airtight box is arranged at the head end of the continuous calcining chamber, the inlet airtight box and the outlet airtight box are communicated with the corresponding ends of the door-shaped sintering tunnel respectively, the discharging pipe is connected with the continuous calcining chamber, a traction cutting-off assembly is arranged at the tail end of the discharging pipe, and the capillary prefabricated part output by the discharging pipe penetrates through the traction cutting-off assembly. The device is used for preparing the door-shaped capillary prefabricated part, the capillary prefabricated part is formed by uniformly mixing the aluminum alloy powder, the NaCl fine powder and other raw materials and then continuously calcining the mixture, the porosity of the capillary prefabricated part can be increased, meanwhile, continuous production operation can be achieved, and the automation level of equipment is improved.

Description

Technical Field

[0001] The present invention relates to the field of preparation of aluminum flat heat pipes for photovoltaic cells, and specifically to a preparation system for a capillary layer preform of an aluminum flat heat pipe for photovoltaic cells. Background Art

[0002] Under the mechanism of the photovoltaic effect, photovoltaic cells generate several times more heat than electrical energy while generating electrical energy. If this heat can be conducted away in time, it can not only ensure the photoelectric conversion efficiency of the photovoltaic panel under high temperature in sunlight, but also extend the service life of the photovoltaic panel. At the same time, a large amount of available waste heat can be obtained. In the prior art, the cooling of photovoltaic cells and the absorption of waste heat are generally achieved through aluminum flat heat pipes. However, because the application area of photovoltaic is huge and the waste heat belongs to low-grade calorific value with low value density, at present, aluminum or aluminum alloy materials are mainly used to make heat pipes, and their internal structure is similar to the gravity flat heat pipe technology without any capillary structure. Because most people think that as long as the heat absorption end of the heat pipe is at the bottom and the heat release end is at the top, a gravity heat pipe structure without any capillary layer or even grooves can be used.

[0003] However, it is found in actual use that the above heat pipe structure without capillary structure has an unsatisfactory use effect. From the relatively microscopic view of a flat heat pipe of several square centimeters, the photovoltaic cell is attached to the upward side of the flat heat pipe. Due to gravity, the refluxed liquid medium must flow to the downward side inside the flat heat pipe. For this local area, the evaporation section is at the top and the condensation section is at the bottom. Although the distance is very close, if there is no capillary structure to transport the liquid working medium below to the hot end, the delivered solar radiation power is only 1 kilowatt per square meter. Or, assuming that the groove of the flat plate is 3 mm wide and calculated by an area of 5 mm × 5 mm, its input heat power is only 0.025 watt. This little heat cannot quickly pass through the groove wall to the cold end on the opposite side, resulting in the dryness of the heat-absorbing evaporation surface, and then causing the flat heat pipe to exit the critical state of isothermal condensation and evaporation phase conversion in each cavity.

[0004] To solve the above problems, one way in the prior art is to adopt structures such as liquid distribution sheets to accelerate the flow of condensate. For example, a patent with the authorization announcement number CN104333324B discloses a solar photovoltaic-thermal integrated energy conversion module, which is provided with a liquid distribution sheet inside the flat heat pipe. The liquid distribution sheet is a metal sheet with a narrow upper part and a wide lower part, and the narrow end of the liquid distribution sheet is connected to the back plate of the flat heat pipe. The width of the liquid distribution sheet abuts against the heat-receiving panel of the flat heat pipe. The liquid distribution sheet can make the condensate flow to the heat-receiving panel faster and more evenly. However, this device needs to uniformly distribute a capillary liquid absorption layer on the inner side of the heat-receiving surface of the flat heat pipe. The material of the capillary liquid absorption layer is metal suction wire, fiberglass mesh or powder metal sintered layer, and it is not easy to achieve in terms of technology.

[0005] Another way in the prior art is to redesign the capillary structure, such as using a capillary preform in a door shape instead of a groove to achieve the capillary function. This avoids direct heating and sintering of the flat heat pipe and maintains the flatness of the flat heat pipe, thereby ensuring that the photovoltaic cell is in close contact with the heat transfer. At the same time, compared with the traditional capillary, the capillary preform has only three sides, and the side at the cold end is smooth and has no resistance, and the liquid refrigerant reflux efficiency is high.

[0006] However, since the above-mentioned door-shaped capillary preform is a newly developed structure, the flat-plate heat pipe preparation method or device in the prior art cannot meet the preparation requirements of the preform. For example, the patent with authorization announcement number CN101941072B discloses a method for manufacturing a flat-plate heat pipe, which uses metal powder to fill the corresponding gap to form a capillary structure. Another example is the patent with authorization announcement number CN112833693B discloses a method for preparing an aluminum flat-plate heat pipe and an aluminum flat-plate heat pipe, which generates a porous super-hydrophilic coating in the cavity of the aluminum plate by an electrochemical deposition method, and uses the porous super-hydrophilic coating as the liquid absorption core of the aluminum flat-plate heat pipe to increase the capillary reflux pressure, thereby overcoming the defect of insufficient heat transfer performance of the aluminum flat-plate heat pipe under reverse gravity conditions. Summary of the invention

[0007] The purpose of the present invention is to provide a system for preparing a capillary layer preform of an aluminum flat heat pipe for a photovoltaic cell, which is used to prepare a gate-shaped capillary preform, and the capillary preform is formed by continuously calcining after uniformly mixing raw materials such as aluminum alloy powder and NaCl fine powder, which can increase the porosity of the capillary preform. At the same time, the present invention can realize continuous production operations, which improves the automation level and production efficiency of the equipment.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A system for preparing aluminum flat heat pipe capillary layer preforms for photovoltaic cells, comprising a feeder, a continuous calcining chamber and a discharge pipe connected in sequence, wherein a heating coil is wound around the outer side of the continuous calcining chamber, a gate-shaped sintering tunnel is arranged inside the continuous calcining chamber, and the head end of the gate-shaped sintering tunnel is connected to a spiral output channel inside the feeder, and the tail end is connected to the gate-shaped discharge channel inside the discharge pipe, an inlet airtight box for inputting reducing protective gas is arranged at the tail end of the continuous calcining chamber, and an outlet airtight box for outputting reducing protective gas is arranged at the head end, and the inlet airtight box and the outlet airtight box are respectively connected to the corresponding ends of the gate-shaped sintering tunnel, a traction and cutting assembly is arranged at the tail end of the discharge pipe, and the gate-shaped capillary preform outputted from the tail end of the discharge pipe passes through the traction and cutting assembly.

[0010] The feeder includes a feeder housing, a feeding screw rod, and a feeding driving device. The feeding screw rod is arranged inside the feeder housing, and the feeding driving device is arranged outside the feeder housing. The feeding screw rod is driven to rotate by the feeding driving device to achieve feeding. The feeder housing includes a material bin, a transmission pipe, and an output pipe that are connected in sequence. The feeding screw rod is arranged in the transmission pipe, and the spiral output channel is arranged in the output pipe. The inner wall of the spiral output channel is of a spiral structure and its diameter gradually decreases along the raw material transmission direction until it is butted against the head end of the portal sintering tunnel in the continuous calcination chamber.

[0011] A feeding connection flange is provided at the end of the output pipe and is flange-connected to the corresponding end flange of the continuous calcination chamber. A positioning pin is provided on the feeding connection flange and is matched with a positioning hole on the corresponding end flange of the continuous calcination chamber.

[0012] The continuous calcination chamber includes a tunnel shaft body, and the portal sintering tunnel is provided at the central axis of the tunnel shaft body. An air inlet channel is provided at the end of the tunnel shaft body, and an air outlet channel is provided at the head end. The inlet airtight box is sleeved on the end of the tunnel shaft body and is communicated with the end of the portal sintering tunnel through the air inlet channel. The outlet airtight box is sleeved on the head end of the tunnel shaft body and is communicated with the head end of the portal sintering tunnel through the air outlet channel. An air inlet micropore array including a plurality of air inlet micropores is provided at the connection between the air inlet channel and the portal sintering tunnel. An air outlet micropore array including a plurality of air outlet micropores is provided at the connection between the air outlet channel and the portal sintering tunnel. The diameters of the air inlet micropores and the air outlet micropores are both smaller than the particle size of the raw material powder.

[0013] A spacer sleeve is sleeved outside the tunnel shaft body, and one end of the spacer sleeve abuts against the inlet airtight box and the other end abuts against the outlet airtight box. A temperature sensor is provided on the spacer sleeve.

[0014] A reducing protective gas inlet is provided on the inlet airtight box, and a reducing protective gas outlet is provided on the outlet airtight box. The reducing protective gas inlet and the reducing protective gas outlet are respectively connected to a reducing protective gas system through pipelines. The reducing protective gas system includes a water vapor separation device. One side of the water vapor separation device is connected to a protective gas storage body through an inlet pipeline, and the other side is connected to a pressure pump through an outlet pipeline. The pressure pump is connected to the reducing protective gas inlet through a first pipeline. In addition, a return pipeline is provided on the inlet pipeline and is connected to a vacuum pump, and the vacuum pump is connected to the reducing protective gas outlet through a second pipeline.

[0015] The traction cutting assembly includes a traction mechanism and a cutting mechanism. The traction mechanism includes a first mounting seat, a second mounting seat, a traction driving device, a main traction wheel and a secondary traction wheel. The first mounting seat, the second mounting seat and the traction driving device are all arranged on the flange at the end of the discharge pipe. The main traction wheel is arranged on the first mounting seat and is driven to rotate by the traction driving device. The secondary traction wheel is arranged on the second mounting seat, and the capillary preform passes between the main traction wheel and the secondary traction wheel. The cutting mechanism is arranged on the second mounting seat and includes a movable saw blade.

[0016] A spring and an elastic support are arranged in the second mounting seat. The rear end of the elastic support is connected to the second mounting seat by the spring. The secondary traction wheel is arranged on the elastic support, and the secondary traction wheel is embedded in the U-shaped groove of the capillary preform.

[0017] The cutting mechanism includes a moving driving device, a lead screw, a moving seat and a sawing driving device. An installation block is arranged on the second mounting seat. The moving driving device and the lead screw are both arranged on the installation block, and the lead screw is driven to rotate by the moving driving device. The moving seat is slidably connected to the second mounting seat, and a nut sleeve is arranged inside the moving seat and sleeved on the lead screw. A sawing driving device and a saw blade are arranged on the moving seat, and the saw blade is driven to rotate by the sawing driving device.

[0018] The raw materials for preparing the capillary preform include aluminum alloy powder and NaCl powder, and the reduction protective gas includes hydrogen.

[0019] The advantages and positive effects of the present invention are as follows:

[0020] 1. The present invention is used to prepare a U-shaped capillary preform, which is used to replace the grooves of a flat heat pipe to achieve capillary function. It is made by uniformly mixing raw materials such as aluminum alloy powder and fine NaCl powder and then continuously calcining. After the sintered capillary preform is taken out of the furnace, cut and cooled, it is washed with clean water, and the NaCl additive is dissolved and removed, leaving the space it occupied in the capillary profile, thereby increasing the porosity of the profile, which further improves the capillary performance of the prefabricated profile.

[0021] 2. In addition to using a feeder to achieve uniform mixing and feeding of raw materials such as aluminum alloy powder and fine NaCl powder, the present invention also reversely inputs a reduction protective gas into the U-shaped sintering tunnel of the continuous calcining chamber. The reduction protective gas starts to react with the possible oxide layer on the surface of the aluminum powder in the high-temperature section of the continuous sintering chamber to generate water. In this way, not only can the oxide layer on the surface of the aluminum powder be removed, but also the re-oxidation during the sintering process of the aluminum powder can be avoided. At the same time, it is also conducive to realizing the separation of water vapor and the recycling of the reduction protective gas.

[0022] 3. The present invention realizes continuous feeding by using a feeder, and at the same time, uses a traction cutting assembly at the end of the discharge pipe to continuously traction and output the shaped capillary preform and cut it to a fixed length in real time, thereby realizing the continuous production operation of the capillary preform, improving the automation level and production efficiency of the equipment. Among them, after the capillary preform in the continuous calcination chamber is output, it is cooled and shaped through a portal discharge channel in the discharge pipe, so as not to affect the main traction wheel and the auxiliary traction wheel in the traction cutting assembly from traction outputting it.

[0023] 4. The present invention can be set vertically or horizontally, and is flexible to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of an embodiment of the present invention,

[0025] Figure 2 is Figure 1 the external view of the feeder in

[0026] Figure 3 is Figure 2 the A-A view in

[0027] Figure 4 is Figure 2 the enlarged view at I in

[0028] Figure 5 is Figure 1 the external view of the continuous calcination chamber in

[0029] Figure 6 is Figure 5 the front view of the continuous calcination chamber in

[0030] Figure 7 is Figure 6 the B-B view in

[0031] Figure 8 is Figure 7 the enlarged view at II in

[0032] Figure 9 is Figure 8 the enlarged view at III in

[0033] Figure 10 is Figure 5 the K-direction view in

[0034] Figure 11 is connected to Figure 5 the schematic structural diagram of the reduction protection gas system of the continuous calcination chamber in

[0035] Figure 12 is provided in Figure 1Schematic diagram of the traction cutting assembly at the lower end of the middle discharge pipe

[0036] Figure 13 Schematic diagram of another embodiment of the present invention

[0037] Figure 14 is Figure 13 the enlarged view of part Ⅳ in

[0038] Among them, 1 is the feeder, 101 is the feeder housing, 1011 is the silo, 1012 is the transfer pipe, 1013 is the output pipe, 1014 is the feeding connection flange, 102 is the feeding motor, 103 is the feeding speed reducer, 104 is the feeding screw rod, 105 is the screw output channel, 106 is the positioning pin, 2 is the continuous calcination chamber, 201 is the heating coil, 202 is the outlet airtight box, 2021 is the reduction protective gas outlet, 203 is the inlet airtight box, 2031 is the reduction protective gas inlet, 204 is the temperature sensor, 205 is the portal sintering tunnel, 206 is the spacer sleeve, 207 is the tunnel shaft body, 208 is the air inlet channel, 209 is the air inlet micropore array, 3 is the vertical frame, 301 is the feeder maintenance observation platform, 302 is the calcination chamber maintenance observation platform, 4 is the capillary preform, 5 is the reduction protective gas system, 501 is the pressure pump, 502 is the vacuum pump, 503 is the water vapor separation device, 504 is the protective gas storage body, 505 is the inlet pipeline, 506 is the outlet pipeline, 507 is the first pipeline, 508 is the return pipeline, 509 is the second pipeline, 6 is the traction cutting assembly, 601 is the main traction wheel, 602 is the traction motor, 603 is the traction speed reducer, 604 is the first mounting seat, 6041 is the wheel groove, 605 is the elastic support, 606 is the spring, 607 is the second mounting seat, 6071 is the mounting block, 608 is the moving drive motor, 609 is the moving speed reducer, 610 is the lead screw, 611 is the moving seat, 612 is the saw blade, 613 is the auxiliary traction wheel, 7 is the discharge pipe, 701 is the portal discharge channel, 8 is the horizontal frame Detailed implementation mode

[0039] The present invention will be further described in detail below with reference to the accompanying drawings

[0040] As Figures 1 to 14 shown, the present invention includes a feeder 1, a continuous calcination chamber 2 and a discharge pipe 7 connected in sequence, among which as Figures 5 to 10As shown, a heating coil 201 is wound around the outside of the continuous calcination chamber 2. Inside the continuous calcination chamber 2, a portal sintering tunnel 205 is provided. The head end of the portal sintering tunnel 205 communicates with the spiral output channel 105 inside the feeder 1, and the tail end communicates with the portal discharge channel 701 inside the discharge pipe 7. An inlet airtight box 203 is provided at the tail end of the continuous calcination chamber 2, and an outlet airtight box 202 is provided at the head end. The inlet airtight box 203 and the outlet airtight box 202 are respectively communicated with the corresponding ends of the portal sintering tunnel 205. A traction cutting assembly 6 is provided at the tail end of the discharge pipe 7, and the portal-shaped capillary preform 4 output from the tail end of the discharge pipe 7 passes through the traction cutting assembly 6.

[0041] As Figures 2 to 4 shown, the feeder 1 includes a feeder housing 101, a feeding screw 104, and a feeding drive device. The feeding screw 104 is arranged inside the feeder housing 101, and the feeding drive device is arranged outside the feeder housing 101. The feeding screw 104 is driven to rotate by the feeding drive device to achieve feeding.

[0042] As Figures 2 to 4 shown, the feeder housing 101 includes a material bin 1011, a transmission pipe 1012, and an output pipe 1013 that are sequentially communicated. The feeding screw 104 is arranged in the transmission pipe 1012, and the spiral output channel 105 is arranged in the output pipe 1013. The inner wall of the spiral output channel 105 is a spiral structure and the diameter gradually decreases along the raw material transmission direction until it is butted against the head end of the portal sintering tunnel 205 inside the continuous calcination chamber 2. In this way, when the present invention works, the raw material can continuously and smoothly transition along the spiral inner wall of the spiral output channel 105 to the head end of the portal sintering tunnel 205, which can prevent the raw material from jamming while ensuring accurate feeding. In addition, in order to further ensure the accurate docking of the tail end of the spiral output channel 105 with the head end of the portal sintering tunnel 205, a feeding connection flange 1014 is provided at the tail end of the output pipe 1013 and is flange-connected to the corresponding end of the continuous calcination chamber 2. And as Figure 4 shown, a positioning pin 106 is provided on the feeding connection flange 1014 to cooperate with the positioning hole on the flange at the corresponding end of the continuous calcination chamber 2 to achieve accurate positioning.

[0043] The feeding drive device includes a feeding motor 102 and a feeding speed reducer 103, and the output shaft of the feeding speed reducer 103 is connected to the feeding screw 104.

[0044] The present invention determines the cross-sectional dimensions of the capillary preform 4 according to the parameters of the flat heat pipe for photovoltaic waste heat recovery. In this embodiment, the overall width of the gate-shaped capillary preform 4 is 3.5 mm, the overall height of the gate shape is 2.5 mm, the thickness of the top of the gate is 0.8 mm, and the thickness of both sides of the gate is 0.5 mm. In addition, in order to minimize the sintering temperature, an aluminum-zinc-tin alloy powder is used for preparation in this embodiment, and a certain proportion of fine NaCl powder (such as fine table salt) is added as an additive. The fine NaCl powder can not only serve as a flux to reduce the sintering temperature but also act as a pore-forming agent. After the sintered product is washed with water, the occupied NaCl is dissolved out, and a large porosity will appear in the preform product, thereby further improving the capillary performance. When the present invention works, the above raw materials are put into the feed bin 1011 on the feeder housing 101, and then the raw materials are stirred and transported by the feed screw 104 to ensure uniform mixing of various materials. Finally, the raw materials are continuously and smoothly transitioned along the spiral-shaped inner wall with a gradually decreasing diameter spiral output channel 105 to the head end of the gate-shaped sintering tunnel 205.

[0045] As Figures 5 to 10 described above, the continuous calcination chamber 2 includes a tunnel shaft body 207, and the gate-shaped sintering tunnel 205 is provided at the central axis of the tunnel shaft body 207. An air inlet channel 208 is provided at the end of the tunnel shaft body 207, and an air outlet channel is provided at the head end. And as Figure 8 shown, the inlet airtight box 203 is sleeved on the end of the tunnel shaft body 207 and is communicated with the end of the gate-shaped sintering tunnel 205 through the air inlet channel 208. And as Figure 7 shown, the outlet airtight box 202 is sleeved on the head end of the tunnel shaft body 207 and is communicated with the head end of the gate-shaped sintering tunnel 205 through the air outlet channel. In this way, when the present invention works, the reducing protective gas is input from the inlet airtight box 203 at the end and output from the outlet airtight box 202 at the head end.

[0046] As Figures 8 to 9 shown, a plurality of air inlet micropores are provided at the connection of the air inlet channel 208 and the gate-shaped sintering tunnel 205 to form an air inlet micropore array 209. The diameter of each air inlet micropore is smaller than the powder particle size to prevent powder leakage. Similarly, a plurality of air outlet micropores are provided at the connection of the air outlet channel and the gate-shaped sintering tunnel 205 to form an air outlet micropore array. The diameter of each air outlet micropore is smaller than the powder particle size to prevent powder leakage.

[0047] As Figures 7 to 8As shown, a spacer sleeve 206 is sleeved outside the tunnel shaft body 207. One end of the spacer sleeve 206 abuts against the inlet airtight box 203, and the other end abuts against the outlet airtight box 202. At the same time, shaft connection flanges are provided at both ends of the tunnel shaft body 207 to cooperate with the spacer sleeve 206 to position the inlet airtight box 203 and the outlet airtight box 202. The heating coil 201 is wound around the spacer sleeve 206, and as Figures 5 to 6 shown, a temperature sensor 204 is provided at a suitable position on the spacer sleeve 206 to detect in real time whether the calcination temperature of the continuous calcination chamber 2 meets the requirements. The temperature sensor 204 is a commercially available product.

[0048] As Figures 5 to 6 shown, a reducing protective gas inlet 2031 is provided on the inlet airtight box 203, and a reducing protective gas outlet 2021 is provided on the outlet airtight box 202. The reducing protective gas inlet 2031 and the reducing protective gas outlet 2021 are respectively connected to the reducing protective gas system 5 through pipelines. As Figure 11 shown, the reducing protective gas system 5 includes a water vapor separation device 503. One side of the water vapor separation device 503 is connected to the protective gas chamber body 504 through an inlet pipeline 505, and the other side is connected to a pressure pump 501 through an outlet pipeline 506. The pressure pump 501 is connected to the reducing protective gas inlet 2031 through a first pipeline 507. In addition, a return pipeline 508 is provided on the inlet pipeline 505 and is connected to a vacuum pump 502. The vacuum pump 502 is connected to the reducing protective gas outlet 2021 through a second pipeline 509.

[0049] Since the aluminum powder used as the raw material has a large specific surface area, it has high chemical activity and is easy to oxidize. Therefore, when heating and sintering, it is necessary to remove the oxide layer on the surface of the aluminum powder and also avoid re-oxidation during sintering. Therefore, in the present invention, an inlet airtight box 203 and an outlet airtight box 202 are provided at both ends of the portal sintering tunnel 205 for reversely inputting a reducing protective gas into the sintering tunnel. The reducing protective gas can be a mixture of nitrogen and hydrogen, or pure hydrogen. The heating coil 201 can be a water-cooled intermediate-frequency heating coil, and the calcination temperature is controlled at 400-450 °C. When the present invention works, the reducing protective gas enters the reducing protective gas inlet 2031 under the action of the pressure pump 501. At the same time, the existence of this pressure can also prevent oxygen in the air from entering the portal sintering tunnel 205. After the reducing protective gas enters the portal sintering tunnel 205, it passes through the gaps between the aluminum powder particles. And the reducing protective gas starts to react with the possible oxide layer on the surface of the aluminum powder in the high-temperature section of the continuous sintering chamber 2 to generate water, and the generated water further forms water vapor under the heating action. Under the negative pressure action of the vacuum pump 502, the reducing protective gas together with the formed water vapor is output from the reducing protective gas outlet 2021 and flows into the water-vapor separation device 503 for water-vapor separation. In this embodiment, the water vapor naturally cools and condenses into water inside the water-vapor separation device 503 and is discharged into the water tank at the lower end of the water-vapor separation device 503, and the reducing protective gas continues to enter the continuous calcination chamber 2 for recycling. In addition, when the reducing protective gas is detected to be insufficient by the sensor, the valve at the outlet of the protector housing 504 will be opened in a timely manner to supplement the protective gas.

[0050] As Figure 12 and Figure 14 As shown, the traction cutting assembly 6 includes a traction mechanism and a cutting mechanism. The traction mechanism includes a first mounting seat 604, a second mounting seat 607, a traction driving device, a main traction wheel 601, and a secondary traction wheel 613. The first mounting seat 604, the second mounting seat 607, and the traction driving device are all arranged on the flange at the end of the discharge pipe 7. The main traction wheel 601 is arranged in the wheel groove 6041 on the first mounting seat 604, and the main traction wheel 601 is driven to rotate by the traction driving device. The secondary traction wheel 613 is arranged on the second mounting seat 607, and the capillary preform 4 passes between the main traction wheel 601 and the secondary traction wheel 613. When the present invention works, the capillary preform 4 is driven to be pulled out by the rotational frictional force of the main traction wheel 601 and the secondary traction wheel 613. The cutting mechanism is arranged on the second mounting seat 607, and the cutting mechanism includes a movable saw blade 612. When the capillary preform 4 is pulled out by a set length, the saw blade 612 moves towards the capillary preform 4 and rotates to cut off the capillary preform 4.

[0051] As Figure 12 and Figure 14 shown, a spring 606 and an elastic support 605 are provided inside the second mounting seat 607, and the rear end of the elastic support 605 is connected to the second mounting seat 607 through the spring 606. The auxiliary traction wheel 613 is provided on the elastic support 605, and the auxiliary traction wheel 613 is embedded in the U-shaped groove of the capillary preform 4. The elastic setting of the auxiliary traction wheel 613 can ensure the traction friction of the capillary preform 4 and will not damage the capillary preform 4. In addition, the capillary preform 4 is cooled and shaped by using the U-shaped discharge channel 701 in the discharge pipe 7, so that when the capillary preform 4 is output from the discharge pipe 7, it can be pulled out by the main traction wheel 601 and the auxiliary traction wheel 613.

[0052] A fixed-length detection device can be provided at the end of the discharge pipe 7 as needed to detect the output length of the capillary preform 4 in real time. When the output length reaches the set requirement, the fixed-length detection device sends a signal to the equipment control system, and the equipment control system controls the saw blade 612 to start for sawing. The fixed-length detection device is a commercially available product, such as a laser length measuring instrument or the like can be used.

[0053] As Figure 12 and Figure 14 shown, in this embodiment, the traction drive device includes a traction motor 602 and a traction speed reducer 603, wherein the output shaft of the traction speed reducer 603 is connected to the main traction wheel 601.

[0054] As Figure 12 and Figure 14 shown, the cutting mechanism includes a moving drive device, a lead screw 610, a moving seat 611 and a sawing drive device. An installation block 6071 is provided on the second mounting seat 607. The moving drive device and the lead screw 610 are both provided on the installation block 6071, and the lead screw 610 is driven to rotate by the moving drive device. A slider is provided on the lower side of the moving seat 611 and is slidably connected with a chute provided on the second mounting seat 607. A nut sleeve is provided inside the moving seat 611 and is sleeved on the lead screw 610. When the lead screw 610 rotates, the moving seat 611 is driven to move through the nut. A sawing drive device and a saw blade 612 are provided on the moving seat 611, and the saw blade 612 is driven to rotate by the sawing drive device to perform a sawing action. As Figure 12 and Figure 14 shown, the moving drive device includes a moving drive motor 608 and a moving speed reducer 609, and the output shaft of the moving speed reducer 609 is connected to the lead screw 610. The sawing drive device is a sawing motor.

[0055] The present invention can be vertically or horizontally arranged according to needs. Among them, as Figure 1 shown, in one embodiment of the present invention, the feeder 1, the continuous calcination chamber 2, and the discharge pipe 7 are sequentially connected and arranged on a vertical frame 3. A feeder maintenance observation platform 301 can be arranged at the upper end of the vertical frame 3 corresponding to the position of the feeder 1, and a calcination chamber maintenance observation platform 302 can be arranged in the middle of the vertical frame 3 corresponding to the position of the continuous calcination chamber 2. And as Figure 13 shown, in another embodiment of the present invention, the feeder 1, the continuous calcination chamber 2, and the discharge pipe 7 are sequentially connected and arranged on a horizontal frame 8. Among them, the bin 1011 of the feeder 1 is arranged on the upper side of one end of the feeder housing 101 to achieve feeding.

[0056] The working principle of the present invention is as follows:

[0057] The present invention first determines the portal end face size of the capillary preform 4 according to the flat heat pipe parameters for photovoltaic waste heat utilization. In this embodiment, the overall width of the portal of the capillary preform 4 is 3.5 mm, the overall height of the portal is 2.5 mm, the thickness of the portal top is 0.8 mm, and the thickness of both sides of the portal is 0.5 mm. The present invention designs the size of the portal sintering tunnel 205 inside the continuous calcination chamber 2 according to the above parameters. Then the present invention needs to determine the aluminum powder material and mesh number. To minimize the sintering temperature, an aluminum-zinc-tin alloy powder is selected in this embodiment. Generally, there should be a width of 10 particle diameters at the thinnest part. Since the thinnest part of the predetermined capillary preform 4 profile is 0.5 mm and the average particle diameter is about 50 microns, according to the empirical formula of powder mesh number and particle diameter, we can get:

[0058]

[0059] Then consider the powder formula. Since it is considered that the porosity will be very small after sintering of 300-mesh fine powder, which will affect the capillary force to pump water, and the working temperature of the capillary preform is within 85 °C and a larger porosity is required, a certain proportion (12% is selected in the embodiment) of NaCl fine powder is added to the raw materials in the present invention. It can not only be used as a flux to reduce the sintering temperature but also serve as a pore-forming agent. After the sintered finished product is washed with water, the occupying NaCl is dissolved out, and a larger porosity will appear in the finished preform.

[0060] When the present invention works, the above raw materials are put into the bin 1011 on the feeder 1, and then the raw materials are stirred and transported by the feeding screw rod 104 to ensure uniform mixing of various materials. Finally, the raw materials continuously and smoothly transition along the spiral output channel 105 with a spiral shape and gradually decreasing diameter on the inner wall to the head end of the portal sintering tunnel 205 of the continuous calcination chamber 2. In this way, while ensuring accurate feeding, it can also prevent raw material jamming.

[0061] When the raw materials enter the continuous calcination chamber 2 for sintering, since the aluminum powder as the raw material has a large specific surface area, its chemical activity is high and it is easy to oxidize. Therefore, the oxide layer on the surface of the aluminum powder must be removed during sintering, and re-oxidation during sintering must also be avoided. Therefore, in the present invention, an inlet airtight box 203 and an outlet airtight box 202 are provided at both ends of the portal sintering tunnel 205 for reversely inputting a reducing protective gas into the sintering tunnel. The reducing protective gas can be a mixture of nitrogen and hydrogen, or pure hydrogen. The reducing protective gas enters the inlet airtight box 203 under the action of the pressure pump 501. At the same time, the existence of this pressure can also prevent oxygen in the air from entering the portal sintering tunnel 205. After the reducing protective gas enters the portal sintering tunnel 205, it passes through the gaps between the aluminum powder particles. And the reducing protective gas starts to react with the possible oxide layer on the surface of the aluminum powder in the high-temperature section of the continuous sintering chamber 2 to generate water, and the generated water further forms water vapor under the heating action. Under the negative pressure action of the vacuum pump 502, the reducing protective gas together with the formed water vapor is output from the outlet airtight box 202 and flows into the water-vapor separation device 503 for water-vapor separation. Among them, the water vapor is naturally cooled and condensed into water and discharged into the water tank at the lower end of the water-vapor separation device 503, and the reducing protective gas continues to enter the continuous calcination chamber 2 for recycling. In addition, the thermal sorting temperature of NaCl is much higher than the calcination temperature. Therefore, when it plays the role of reducing the melting point, its chemical and physical properties do not change. Therefore, the occupied space as an additive does not change. After the portal-shaped capillary preform 4 that has completed sintering is taken out of the furnace, cut off, and cooled, it is washed with clean water. The NaCl additive is dissolved out and leaves the space it occupied in the capillary profile, thereby increasing the porosity of the profile and further improving the capillary performance of the prefabricated profile.

[0062] The capillary preform 4 sintered in the continuous calcination chamber 2 is pulled out and cut to a fixed length through the traction cutting assembly 6 at the end of the discharge pipe 7. The capillary preform 4 output from the continuous calcination chamber 2 first undergoes cooling and shaping through the portal-shaped discharge channel 701 in the discharge pipe 7. Therefore, after the capillary preform 4 is output from the discharge pipe 7, it can be pulled through the cooperation of the main traction wheel 601 and the auxiliary traction wheel 613 in the traction cutting assembly 6. And the auxiliary traction wheel 613 is elastically arranged to ensure the traction friction of the capillary preform 4 without damaging the capillary preform 4. The present invention uses the feeder 1 to achieve continuous feeding, and at the same time uses the traction cutting assembly 6 at the end of the discharge pipe 7 to continuously pull out the shaped capillary preform and cut it to a fixed length in real time, thereby realizing the continuous production operation of the capillary preform, which improves the automation level and production efficiency of the equipment, and at the same time can ensure the production quality.

Claims

1. An aluminum flat heat pipe capillary layer preform preparation system for a photovoltaic cell, characterized in that: It includes a feeder (1), a continuous calcination chamber (2), and a discharge pipe (7) connected in sequence. A heating coil (201) is wound around the outside of the continuous calcination chamber (2). A gantry sintering tunnel (205) is provided inside the continuous calcination chamber (2). The head end of the gantry sintering tunnel (205) communicates with a spiral output channel (105) inside the feeder (1), and the tail end communicates with a gantry discharge channel (701) inside the discharge pipe (7). An inlet airtight box (203) for inputting reduction protective gas is provided at the tail end of the continuous calcination chamber (2), and an outlet airtight box (202) for outputting reduction protective gas is provided at the head end. The inlet airtight box (203) and the outlet airtight box (202) are respectively communicated with corresponding ends of the gantry sintering tunnel (205). A traction cutting assembly (6) is provided at the tail end of the discharge pipe (7), and a capillary preform (4) in the shape of a gantry output from the tail end of the discharge pipe (7) passes through the traction cutting assembly (6).

2. The preparation system for the aluminum flat heat pipe capillary layer preform for a photovoltaic cell according to claim 1, characterized in that: The feeder (1) includes a feeder housing (101), a feeding screw rod (104), and a feeding driving device. The feeding screw rod (104) is arranged inside the feeder housing (101), and the feeding driving device is arranged outside the feeder housing (101). The feeding screw rod (104) is driven to rotate by the feeding driving device to achieve feeding. The feeder housing (101) includes a material bin (1011), a transmission pipe (1012), and an output pipe (1013) connected in sequence. The feeding screw rod (104) is arranged in the transmission pipe (1012), and the spiral output channel (105) is arranged in the output pipe (1013). The inner wall of the spiral output channel (105) is a spiral structure and its diameter gradually decreases along the raw material transmission direction until it is butted against the head end of the gantry sintering tunnel (205) in the continuous calcination chamber (2).

3. The aluminum flat heat pipe capillary layer preform preparation system for a photovoltaic cell according to claim 2, wherein: A feeding connection flange (1014) is provided at the tail end of the output pipe (1013) and is flange-connected to the corresponding end of the continuous calcination chamber (2). A positioning pin (106) is provided on the feeding connection flange (1014) and is matched with a positioning hole on the flange of the corresponding end of the continuous calcination chamber (2).

4. The preparation system of the aluminum flat heat pipe capillary layer preform for a photovoltaic cell according to claim 1, characterized in that: The continuous calcination chamber (2) includes a tunnel shaft body (207), and a gantry sintering tunnel (205) is provided at the central axis of the tunnel shaft body (207). An air inlet channel (208) is provided at the end of the tunnel shaft body (207), and an air outlet channel is provided at the head end. The inlet airtight box (203) is sleeved on the end of the tunnel shaft body (207) and communicates with the end of the gantry sintering tunnel (205) through the air inlet channel (208). The outlet airtight box (202) is sleeved on the head end of the tunnel shaft body (207) and communicates with the head end of the gantry sintering tunnel (205) through the air outlet channel. An air inlet micropore array (209) including a plurality of air inlet micropores is provided at the connection between the air inlet channel (208) and the gantry sintering tunnel (205). An air outlet micropore array including a plurality of air outlet micropores is provided at the connection between the air outlet channel and the gantry sintering tunnel (205). The diameters of the air inlet micropores and the air outlet micropores are both smaller than the particle size of the raw material powder.

5. The aluminum flat heat pipe capillary layer preform preparation system for a photovoltaic cell according to claim 4, characterized in that: A spacer sleeve (206) is sleeved on the outside of the tunnel shaft body (207). One end of the spacer sleeve (206) abuts against the inlet airtight box (203), and the other end abuts against the outlet airtight box (202). A temperature sensor (204) is provided on the spacer sleeve (206).

6. The aluminum flat heat pipe capillary layer preform preparation system for a photovoltaic cell according to claim 4, characterized in that: A reducing protective gas inlet (2031) is provided on the inlet airtight box (203), and a reducing protective gas outlet (2021) is provided on the outlet airtight box (202). The reducing protective gas inlet (2031) and the reducing protective gas outlet (2021) are respectively connected to a reducing protective gas system (5) through pipelines. The reducing protective gas system (5) includes a water vapor separation device (503). One side of the water vapor separation device (503) is connected to a protective gas storage body (504) through an inlet pipeline (505), and the other side is connected to a pressure pump (501) through an outlet pipeline (506). The pressure pump (501) is connected to the reducing protective gas inlet (2031) through a first pipeline (507). In addition, a return pipeline (508) is provided on the inlet pipeline (505) and is connected to a vacuum pump (502). The vacuum pump (502) is connected to the reducing protective gas outlet (2021) through a second pipeline (509).

7. The preparation system for the aluminum flat heat pipe capillary layer preform for a photovoltaic cell according to claim 1, characterized in that: The traction cutting assembly (6) includes a traction mechanism and a cutting mechanism. The traction mechanism includes a first mounting seat (604), a second mounting seat (607), a traction driving device, a main traction wheel (601) and a secondary traction wheel (613). The first mounting seat (604), the second mounting seat (607) and the traction driving device are all arranged on the flange at the end of the discharge pipe (7). The main traction wheel (601) is arranged on the first mounting seat (604), and the main traction wheel (601) is driven to rotate by the traction driving device. The secondary traction wheel (613) is arranged on the second mounting seat (607), and the capillary preform (4) passes between the main traction wheel (601) and the secondary traction wheel (613). The cutting mechanism is arranged on the second mounting seat (607), and the cutting mechanism includes a movable saw blade (612).

8. The aluminum flat heat pipe capillary layer prefabrication system for a photovoltaic cell according to claim 7, wherein: A spring (606) and an elastic support (605) are arranged in the second mounting seat (607). The rear end of the elastic support (605) is connected to the second mounting seat (607) through the spring (606). The secondary traction wheel (613) is arranged on the elastic support (605), and the secondary traction wheel (613) is embedded in the U-shaped groove of the capillary preform (4).

9. The preparation system for the aluminum flat heat pipe capillary layer preform for a photovoltaic cell according to claim 7, characterized in that: The cutting mechanism includes a moving driving device, a lead screw (610), a moving seat (611) and a sawing driving device. An installation block (6071) is arranged on the second mounting seat (607). The moving driving device and the lead screw (610) are both arranged on the installation block (6071), and the lead screw (610) is driven to rotate by the moving driving device. The moving seat (611) is slidably connected to the second mounting seat (607), and a nut sleeve is arranged inside the moving seat (611) and sleeved on the lead screw (610). A sawing driving device and a saw blade (612) are arranged on the moving seat (611), and the saw blade (612) is driven to rotate by the sawing driving device.

10. The preparation system of the aluminum flat heat pipe capillary layer preform for a photovoltaic cell according to claim 1, characterized in that: The raw materials for preparing the capillary preform (4) include aluminum alloy powder and NaCl powder, and the reducing protective gas includes hydrogen.

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