Method for preparing a heat exchanger

Abstract

The present invention discloses a method for preparing a heat exchanger, comprising: feeding a diaphragm into an injection mold, and forming a structural frame portion at a predetermined position along the edge of the diaphragm by injection molding, so that an integrated structure is formed between the diaphragm and the structural frame portion; providing a hot air chamber for heating the diaphragm within the injection mold; while injecting the structural frame portion, starting to introduce hot air into the hot air chamber to heat the diaphragm to a predetermined hot pressing temperature, so that the diaphragm softens to a hot pressing state suitable for hot pressing deformation processing; providing a hot pressing mold within the injection mold; after the diaphragm is heated to the hot pressing state, closing the hot pressing mold to hot press and deform a heat exchange portion on the diaphragm to form a formed heat exchanger; removing the formed heat exchanger, and successively stacking the formed heat exchanger fins from bottom to top to form a heat exchanger. The present invention provides a simple and stable heat exchanger structure with high production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange equipment, and in particular to a method for preparing a heat exchanger. Background Art

[0002] The existing plate-type air heat exchangers on the market generally include heat exchange fins for heat exchange and frames for tightening and stabilizing the shape of the heat exchange fins. Therefore, the production and assembly of existing plate-type air heat exchangers require the heat exchange fins and frames to be assembled and then stacked. Since plate-type air heat exchangers generally require a large number of heat exchange fins to be assembled, the assembly process of the heat exchange fins and frames will seriously hinder the improvement of production efficiency.

[0003] On the other hand, for heat exchangers with a larger area, when the size of the air inlet does not match the size of the heat exchange part of the heat exchanger, for example, the width of the air inlet is too different from the length of the heat exchange part, the airflow will flow along the direction of the air inlet through the corresponding local position of the heat exchange part, which will easily cause the airflow to flow unevenly through the heat exchange part, resulting in airflow turbulence, and eventually causing the heat exchanger to vibrate, which will further aggravate the turbulence of the airflow and reduce the flow rate of the airflow through the heat exchanger. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a heat exchanger with a simple and stable structure.

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a method for preparing a heat exchanger with high production efficiency and good hot pressing forming effect of the heat exchanger plate.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a heat exchanger comprising a plurality of heat exchange fins, wherein the middle portion of the heat exchange fins is deformed alternately into concave and convex shapes to form a heat exchange portion having multiple heat exchange channels on the upper and lower surfaces of the heat exchange fins;

[0007] The edges of the heat exchange fins are provided with structural frame portions, and the heat exchange fins are sequentially butted and overlapped through the structural frame portions, so that a preset overlap gap is left between the heat exchange fins;

[0008] Wherein, the structural frame portion is provided with two notches to form an air inlet and an air outlet on both sides of the heat exchange channel respectively;

[0009] On the heat exchange plate, a plurality of structural flow guiding ribs are provided between the air inlet and the heat exchange portion to form flow guiding channels for guiding the heat exchange portion in partitions.

[0010] As an improvement to the above solution, the upper and lower end surfaces of the structural frame portion are respectively provided with mutually adapted docking grooves and plug-in portions;

[0011] Between adjacent heat exchange fins, the plug-in portion of one heat exchange fin is inserted into the docking groove of another heat exchange fin.

[0012] As an improvement to the above solution, at the notch, the upper and lower surfaces of the heat exchange plate are respectively provided with support columns for the structural frame portion and the plug-in portion.

[0013] As an improvement to the above solution, the heat exchange portion has a wavy structure, and the wavy structure is composed of a plurality of inclined guide walls, and the heat exchange channel is formed between adjacent guide walls;

[0014] A raised ridge is formed above the heat exchange fins between adjacent guide walls, and the lower surface of the raised ridge forms the heat exchange channel.

[0015] As an improvement to the above solution, at least one of the raised ridges is provided with a positioning recess, so that the heat exchange channel located on the lower surface of the heat exchange fin forms a corresponding positioning support top;

[0016] Between two adjacent heat exchange fins, the raised ridge of the lower heat exchange fin supports the top of the positioning support of the upper heat exchange fin.

[0017] As an improvement to the above solution, the positioning recess is V-shaped, so that the top of the positioning support forms a snap fit with the raised ridge.

[0018] As an improvement to the above solution, the heat exchange fins are divided into male heat exchange fins and female heat exchange fins, and the male heat exchange fins and the female heat exchange fins are alternately stacked in sequence;

[0019] The gas flow direction between the air inlet and the air outlet of the male heat exchange plate is the male plate flow direction, and the gas flow direction between the air inlet and the air outlet of the male heat exchange plate is the female plate flow direction;

[0020] The flow direction of the male plate and the flow direction of the female plate are arranged at an angle, and the structural guide ribs of the male heat exchange plate and the structural guide ribs of the female heat exchange plate form a mesh in horizontal projection.

[0021] As an improvement to the above solution, the heat exchanger is an integrated structure.

[0022] A method for manufacturing a heat exchanger comprises feeding a diaphragm for forming a heat exchange plate into an injection mold, closing the injection mold to clamp and secure the edge of the diaphragm, and then forming a structural frame portion at a predetermined position on the edge of the diaphragm by injection molding, so that an integrated structure is formed between the diaphragm and the structural frame portion;

[0023] After the injection mold is clamped and fixed with the diaphragm, a hot air cavity for heating the diaphragm is provided in the injection mold, and the diaphragm is located in the hot air cavity;

[0024] While the structural frame portion is being injected, hot air is introduced into the hot air chamber to heat the diaphragm to a preset hot pressing temperature and continue for a preset time to soften the diaphragm to a hot pressing state suitable for hot pressing deformation treatment;

[0025] A hot pressing mold is provided in the injection mold. When the diaphragm is heated to a hot pressing state, the hot pressing mold is closed to hot press and deform the diaphragm to form a structure guide rib and a heat exchange portion with multiple heat exchange channels to form a molded heat exchange plate.

[0026] The formed heat exchange fins are taken out and stacked one after another from bottom to top to form a heat exchanger.

[0027] As an improvement to the above solution, the diaphragm is fed into the injection mold by a feeding robot arm;

[0028] The feeding robot arm is provided with a film absorbing plate for receiving the film and a heating device for heating the film absorbing plate. The film absorbing plate is provided with a plurality of negative pressure holes connected to a vacuum pump so that the film is attached to the film absorbing plate.

[0029] The heating device preheats the diaphragm by utilizing the time when the feeding robot arm transfers the diaphragm and the time when the diaphragm waits to be fed into the injection mold.

[0030] As an improvement to the above solution, the film absorbing plate is provided with a blowing hole for ejecting gas;

[0031] When the feeding robot arm delivers the diaphragm to the desired position, the negative pressure hole stops adsorbing the diaphragm, and the blowing hole sprays gas to separate the diaphragm from the film absorbing plate.

[0032] As an improvement to the above solution, within the hot air chamber, the hot air chamber is divided into an upper air chamber and a lower air chamber according to the arrangement position of the diaphragm, and the upper air chamber and the lower air chamber are both provided with air inlets connected to a pipe for inputting hot air, so that the hot air flows through the upper and lower surfaces of the diaphragm, causing the diaphragm to be heated to a preset hot pressing temperature and maintained for a preset time, so that the diaphragm is softened to a hot pressing state suitable for hot pressing deformation treatment;

[0033] The direction of the air inlet of the upper air cavity is opposite to the direction of the air inlet of the lower air cavity.

[0034] As an improvement to the above solution, at least two injection molds are provided, and are located on both sides of the feeding robot arm respectively. The heat exchange fins in the injection mold are taken out by the taking-out robot arm and moved to the stacking platform for stacking;

[0035] The feeding robot arm feeds the film into an injection mold and then returns to the storage platform for stacking the film, absorbs and takes the next film to be processed, and preheats the film through the heating device until another injection mold is opened;

[0036] After the injection mold is opened, the material taking robot arm takes away the formed heat exchange plate, and the material feeding robot arm feeds the preheated diaphragm into the injection mold and then returns to the storage platform.

[0037] As an improvement to the above solution, the retrieving robot arm is provided with a retrieving mounting plate, and the retrieving mounting plate is provided with a retrieving working area that can cover the surface of the heat exchange fin;

[0038] The heat exchange plate is provided with a main body plane area, and the main body plane area is the area of ​​the diaphragm that has not been subjected to hot pressing and injection molding treatments;

[0039] The material taking working area is provided with a plurality of adsorption devices corresponding to the plane area of ​​the main body;

[0040] The material taking mechanical arm absorbs the main plane area of ​​the heat exchange plate through the adsorption device to pick up the heat exchange plate.

[0041] As an improvement to the above solution, on the retrieving mounting plate, the retrieving working area is provided with a plurality of pressing devices corresponding to the structural frame portion;

[0042] After the retrieving mechanical arm receives the heat exchange fins, it performs a stacking and placement operation on the stacking platform;

[0043] The stacking operation includes:

[0044] The heat exchange fins adsorbed by the adsorption device are placed directly above the heat exchange fins on the stacking platform by the retrieving mechanical arm;

[0045] Then, when the adsorption device stops the adsorption work, the pressing device presses down the heat exchange plate to completely separate the heat exchange plate from the adsorption device and press the heat exchange plate on the stacking platform.

[0046] As an improvement to the above solution, the heating device for delivering hot air to the air inlet includes a fan for supplying air and a heating device for heating, wherein the airflow generated by the fan is heated by the heating device to form hot air;

[0047] By measuring the temperature of the hot air flowing through the air inlet, the heating power of the heating device is regulated so that the temperature of the hot air flowing through the air inlet is maintained at a preset value.

[0048] As an improvement to the above solution, the temperature of the hot air flowing through the air inlet is the inlet air temperature, and the inlet air temperature is 5-20° C. higher than the hot pressing temperature;

[0049] The inlet air temperature is maintained within a preset temperature range, and the time for the diaphragm to heat up to the hot pressing state is controlled by regulating the air flow rate of the fan.

[0050] The implementation of the present invention has the following beneficial effects:

[0051] An embodiment of the present invention discloses a heat exchanger comprising a plurality of heat exchange fins, wherein the middle portion of the heat exchange fins is deformed alternately into convex and concave shapes to form a heat exchange portion having multiple heat exchange channels on the upper and lower surfaces of the heat exchange fins, thereby increasing the area of ​​the heat exchange fins in contact with air and improving the heat exchange efficiency.

[0052] The edges of the heat exchange plates are provided with structural frame parts, and the heat exchange plates are sequentially butted and overlapped through the structural frame parts, so that a preset overlapping gap is left between the heat exchange plates to ensure gas flow space between the heat exchange plates.

[0053] Moreover, the structural frame portion is provided with two notches to form an air inlet and an air outlet on both sides of the heat exchange channel respectively; on the heat exchange plate, a plurality of structural guide ribs are provided between the air inlet and the heat exchange portion to form a guide channel for partitioning and guiding the heat exchange portion, so that the air flow can flow evenly through the heat exchange portion, which not only improves the utilization rate of the heat exchange portion, but also reduces the vibration amplitude of the heat exchange plate.

[0054] Accordingly, during the heat exchanger manufacturing process, the present invention utilizes an injection mold and a hot press mold within the mold to perform injection molding of the structural frame portion of the diaphragm and hot press molding of the heat exchange portion. This results in an integrated heat exchanger structure, eliminating the need for the subsequent assembly of the diaphragm and frame into the heat exchanger required in existing production techniques. This allows the present invention to proceed directly to the next step of stacking after the mold is opened and the formed heat exchanger is removed, resulting in the production of a finished heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 1 is a schematic diagram of the three-dimensional structure of the heat exchanger of the present invention;

[0056] Figure 2 Schematic diagram of the local structure of the upper surface of the heat exchange plate of the present invention;

[0057] Figure 3 This is a schematic diagram of the partial structure of the upper surface of the heat exchange plate of the present invention from another angle;

[0058] Figure 4 Schematic diagram of the partial structure of the lower surface of the heat exchange plate of the present invention;

[0059] Figure 5 1 is a schematic diagram of the structural decomposition of the heat exchanger of the present invention;

[0060] Figure 6 This is a production line for preparing the heat exchanger of the present invention;

[0061] Figure 7 It is a structural schematic diagram of the injection mold and hot pressing mold of the present invention;

[0062] Figure 8 It is a structural schematic diagram of the film absorbing plate of the present invention;

[0063] Figure 9 It is a structural schematic diagram of the adsorption device and the top pressure device of the present invention. DETAILED DESCRIPTION

[0064] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0065] See also Figure 1-5 An embodiment of the present invention provides a heat exchanger comprising a plurality of heat exchange fins 1, wherein the middle portion of the heat exchange fins 1 is deformed alternately into concave and convex shapes to form a heat exchange portion 11 having a plurality of heat exchange channels A on the upper and lower surfaces of the heat exchange fins 1;

[0066] The edges of the heat exchanger plates 1 are provided with a structural frame portion 12, and the heat exchanger plates 1 are sequentially butted and overlapped through the structural frame portion 12, so that a preset overlap gap is left between the heat exchanger plates 1;

[0067] The structural frame portion 12 is provided with two notches to form an air inlet 121 and an air outlet 122 on both sides of the heat exchange channel A respectively;

[0068] On the heat exchange plate 1, a plurality of structural guide ribs 13 are provided between the air inlet 121 and the heat exchange portion 11 to form guide channels 13a for guiding the air to the heat exchange portion 11 in sections. Preferably, a plurality of structural guide ribs 13 are provided between the air outlet 122 and the heat exchange portion 11 to form guide channels for guiding the air to the heat exchange portion 11 in sections.

[0069] Specifically, in order to facilitate the stacking and assembly of the heat exchanger plates 1, the upper and lower end surfaces of the structural frame portion 12 are respectively provided with mutually adapted docking grooves 123 and plug-in portions 124; between adjacent heat exchanger plates 1, the plug-in portion 124 of one heat exchanger plate 1 is inserted into the docking groove 123 of another heat exchanger plate 1.

[0070] Due to the arrangement of the air inlet 121 and the air outlet 122, the gap lacks support for maintaining distance between adjacent heat exchange fins 1. Therefore, support columns 14 for the structural frame portion 12 and the plug-in portion 124 are provided on the upper and lower surfaces of the heat exchange fin 1 at the gap. Multiple support columns 14 are provided along the width of the gap, with spacing between adjacent support columns 14 to maintain fluid flow in the gap.

[0071] Preferably, the heat exchange plate 1 is polygonal, more preferably, the heat exchange plate 1 is hexagonal. When the heat exchange plate 1 is hexagonal, the structural frame portion 12 is a hexagonal outline with two sides missing, and the two missing sides form two gaps, namely the air inlet 121 and the air outlet 122.

[0072] The heat exchange portion 11 has a wave-like structure, which is composed of a plurality of inclined guide walls 111 , and the heat exchange channel A is formed between adjacent guide walls 111 ;

[0073] A raised ridge B is formed above the heat exchange fins 1 between adjacent guide walls 111, and the lower surface of the raised ridge B forms the heat exchange channel A. Preferably, the heat exchange portion 11 has a folding fan structure, that is, a W-shaped wave structure.

[0074] The wavy structure can provide the heat exchange portion 11 with longitudinal bending resistance, thereby greatly reducing the up and down vibration of the heat exchange portion 11 .

[0075] Furthermore, in order to enhance the resistance of the heat exchange portion 11 to lateral vibration, at least one of the raised ridges B is provided with a positioning recess 112, so that the heat exchange channel A located on the lower surface of the heat exchange plate 1 forms a corresponding positioning support top 113. The setting of the positioning support top 113 can play a role in lateral support between the guide walls 111 on the adjacent two sides.

[0076] Moreover, between two adjacent heat exchanger plates 1, the raised ridge B of the lower heat exchanger plate 1 supports the top 113 of the positioning support of the upper heat exchanger plate 1, which can further maintain the gap between the adjacent heat exchanger plates 1 and prevent the guide walls 111 from fitting together during the longitudinal and lateral vibration of the heat exchanger plates 1.

[0077] Preferably, the positioning recess 112 is V-shaped, so that the positioning support top 113 forms a snap fit with the raised ridge B. This allows the raised ridge B to be stably positioned in the heat exchange channel A while limiting contact with the adjacent two sides of the guide wall 111.

[0078] For the convenience of description, the heat exchange plate 1 is divided into a male heat exchange plate 1a and a female heat exchange plate 1b, and the male heat exchange plate 1a and the female heat exchange plate 1b are alternately stacked in sequence;

[0079] The gas flow direction between the air inlet 121 and the air outlet 122 of the male heat exchange plate 1a is the male plate flow direction, and the gas flow direction between the air inlet 121 and the air outlet 122 of the male heat exchange plate 1b is the female plate flow direction;

[0080] The flow direction of the male plate and the flow direction of the female plate are arranged at an angle, and the structural guide ribs 13 of the male heat exchange plate a and the structural guide ribs 13 of the female heat exchange plate 1b form a mesh in horizontal projection, so that the entire surface of the heat exchange plate 1 has good seismic performance, especially after overlapping and assembling, a technical effect of combined seismic resistance can be obtained.

[0081] Preferably, the heat exchanger is an integrated structure.

[0082] Furthermore, regarding the arrangement of the positioning support tops 113, both the male and female heat exchanger fins 1a and 1b are provided with positioning support tops at intervals of a preset number of raised ridges B, and the positions of the positioning support tops of the male and female heat exchanger fins 1a and 1b are staggered. If the male heat exchanger fin 1a does not have a positioning support top, the raised ridge B is inserted into the positioning support top of the female heat exchanger fin 1b.

[0083] See also Figure 6 The present invention also discloses a method for preparing a heat exchanger:

[0084] 1. The diaphragm 3 used to form the heat exchanger fin 1 is placed into the injection mold 2, and the injection mold 2 is closed to clamp and fix the edge of the diaphragm 3;

[0085] 2. A structural frame portion 12 is formed by injection molding at a preset position on the edge of the diaphragm 3 to form an integrated structure between the diaphragm 3 and the structural frame portion 12. This arrangement can prevent the diaphragm 3 from undergoing irregular deformation due to cooling and shrinkage of the diaphragm 3 after subsequent hot pressing.

[0086] 3. After the injection mold 2 is clamped and fixed with the diaphragm 3, a hot air cavity 21 for heating the diaphragm 3 is provided in the injection mold 2, and the diaphragm 3 is located in the hot air cavity 21;

[0087] 4. While the structural frame portion 12 is being injected, hot air is introduced into the hot air chamber 21 to heat the diaphragm 3 to a predetermined hot pressing temperature and continue for a predetermined time to soften the diaphragm 3 to a hot pressing state suitable for hot pressing deformation treatment;

[0088] 5. A hot pressing mold 4 is provided within the injection mold 2. After the diaphragm 3 is heated to a hot pressing state, the hot pressing mold 4 is closed to hot press and deform the diaphragm 3 into structural guide ribs 13 and a heat exchange portion 11 having multiple heat exchange channels A. The heat exchange portion 11 has a fan-shaped structure, i.e., a W-shaped wave structure, and the structural guide ribs 13 are strip-shaped structures with a V-shaped cross-section.

[0089] 6. The hot pressing mold 4 and the injection mold 2 are opened in sequence, and the formed heat exchanger fins 1 can be taken out manually or by the feeding robot 5, and the formed heat exchanger fins 1 are gradually stacked from bottom to top to form a heat exchanger.

[0090] In order to balance the time required for the injection molding process and the hot pressing process to improve the overall production efficiency, the working hours consumed by the hot pressing process can be close to the relatively longer working hours consumed by the injection molding process.

[0091] First, for step 1, the diaphragm 3 can be fed into the injection mold 2 by the feeding robot 5;

[0092] The feeding robot 5 is equipped with a film suction plate 51 for receiving the film 3 and a heating device 52 for heating the film suction plate 51. The film suction plate 51 is provided with multiple negative pressure holes connected to a vacuum pump to allow the film 3 to adhere to the film suction plate 51. This material removal method, in which the film 3 adheres to the surface of the film suction plate 51, can keep the film 3 flat, thereby allowing the film 3 to be precisely clamped and fixed by the subsequent injection mold 2. At the same time, the film 3 can avoid wrinkles when being transferred and placed in the injection mold 2.

[0093] Furthermore, the provision of the heating device 52 can preheat the film 3 by utilizing the time the feeding robot 5 transfers the film 3 and the time the film 3 waits to be fed into the injection mold 2, thereby shortening the time it takes for the film 3 to be heated to the hot pressing state. The heating device 52 is preferably a heating film or heating sheet of conventional technology, which is attached to the surface of the film absorbing plate 51 to uniformly heat the film absorbing plate 51.

[0094] See also Figure 8 The film absorbing plate 51 is provided with a blowing hole for ejecting gas; when the feeding robot 5 delivers the diaphragm 3 to the desired position, the negative pressure hole stops adsorbing the diaphragm 3, and the blowing hole ejects gas to separate the diaphragm 3 from the film absorbing plate 51, so as to solve the problem of adsorption between the diaphragm 3 and the film absorbing plate 51 when the negative pressure hole has not yet returned to normal pressure. Preferably, the film absorbing plate 51 is a cavity structure, and the blowing hole and the negative pressure hole are through holes 53 opened on the bottom surface of the cavity structure. When the cavity structure is connected to a vacuum pump and an air supply pump, the air pressure state in the cavity structure can be changed by switching the operation of the vacuum pump and the air supply pump, so that the through holes on the bottom surface of the cavity structure become negative pressure holes or blowing holes. Accordingly, the heating film and the heating sheet are attached to the inner bottom surface of the cavity structure.

[0095] See also Figure 7For step 4, in order to accelerate the heating efficiency of the diaphragm 3, the hot air chamber 21 is divided into an upper air chamber 21a and a lower air chamber 21b according to the arrangement position of the diaphragm 3. The upper air chamber 21a and the lower air chamber 21b are both provided with an air inlet 211 connected to a pipe for inputting hot air, so that the hot air flows through the upper and lower surfaces of the diaphragm 3, so that the diaphragm 3 is heated to a preset hot pressing temperature and maintained for a preset time, so that the diaphragm 3 is softened to a hot pressing state suitable for hot pressing deformation treatment;

[0096] Preferably, the direction of the air inlet 211 of the upper air cavity is opposite to that of the air inlet 211 of the lower air cavity, thereby heating the diaphragm 3 more evenly and avoiding the problem of localized overheating in the area of ​​the diaphragm 3 near the air inlet 211. For example, when the hot air from the upper air cavity flows from right to left, the temperature rise rate of the upper surface of the diaphragm 3 gradually decreases from right to left. Correspondingly, when the hot air from the lower air cavity flows from left to right, the temperature rise rate of the upper surface of the diaphragm 3 gradually decreases from left to right. Therefore, the arrangement of the air inlet 211 of the upper air cavity in the opposite direction to that of the air inlet 211 of the lower air cavity can heat the diaphragm 3 more evenly.

[0097] In order to better utilize the waiting time required for the injection molding process and the hot pressing process, at least two injection molds are provided, and are located on both sides of the feeding robot arm 5. The heat exchanger in the injection mold 2 is taken out by the material taking robot arm 6 and moved to the stacking platform 7 for stacking. It should be noted that generally, the opening of the injection mold 2 is equivalent to the completion of the injection molding process and the hot pressing process of the diaphragm 3. Both the injection mold 2 and the hot pressing mold 4 are opened to allow the diaphragm 3 to be processed to be placed in, or the processed diaphragm 3, i.e., the heat exchanger, to be taken out.

[0098] In step 1, if there are two injection molds 2, for the convenience of description, the two injection molds 2 are respectively injection mold A and injection mold B;

[0099] 1.1 After the injection mold A is opened, the feeding robot 5 feeds the diaphragm 3 into the injection mold A, and the injection mold A proceeds to steps 2-6;

[0100] 1.2 The feeding robot arm 5 returns to the storage platform 8 for stacking the membranes 3, absorbs and takes the next membrane 3 to be processed, and preheats the membrane 3 through the heating device 52 until the injection mold B is opened;

[0101] 1.3 After the B injection mold is opened, the material taking robot arm 6 takes away the formed heat exchanger fin in the B injection mold, and the material feeding robot arm 5 feeds the preheated diaphragm 3 into the B injection mold, and the B injection mold performs steps 2-6;

[0102] 1.4 The material-retrieving robot arm 6 returns to the storage platform 8 to absorb and pick up the next membrane 3 to be processed, and preheats the membrane 3 through the heating device 52 until the injection mold A is opened.

[0103] See also Figure 9 , for step 6, the reclaiming robot arm 6 is provided with a reclaiming mounting plate 63, and the reclaiming mounting plate is provided with a reclaiming working area that can cover the surface of the heat exchange fin;

[0104] The heat exchanger fin has a main body planar area, which is the area of ​​the diaphragm 3 that has not been subjected to the hot pressing and injection molding processes. The material retrieving workspace is equipped with multiple suction devices corresponding to the main body planar area. The retrieving robot arm 6 uses the suction devices 61 to suction the main body planar area of ​​the heat exchanger fin to retrieve the fin. The suction device 61 includes a suction cup connected to a vacuum line and a telescopic rod for mounting the suction cup. The telescopic rod includes a sleeve, a sleeve rod for connecting the suction cup, and a spring disposed within the sleeve. The sleeve rod is installed within the sleeve to compress the spring, thereby allowing the suction cup to flexibly contact the heat exchanger fin.

[0105] On the reclaiming mounting plate, the reclaiming working area is provided with a plurality of top pressing devices 62 corresponding to the structural frame portion;

[0106] After the retrieving robot arm 6 receives the heat exchanger, it performs a stacking and placement operation on the stacking platform 7;

[0107] The stacking operation includes:

[0108] The heat exchanger fins adsorbed by the adsorption device 61 are placed directly above the heat exchanger fins on the stacking platform 7 by the retrieving robot arm 6;

[0109] Then, while the adsorption device 61 stops adsorption, the pressing device 62 presses down on the heat exchanger fins, completely separating the heat exchanger fins from the adsorption device 61 and pressing the heat exchanger fins on the stacking platform 7. The pressing device 62 can be an existing pneumatic telescopic rod device. The pressing device 62 presses the structural frame to achieve the unloading of the heat exchanger fins and the stacking and compacting of the heat exchanger fins, thereby preventing the relatively weak planar area of ​​the main body from being penetrated.

[0110] For step 4, the heating equipment for delivering hot air to the air inlet 211 includes a fan for supplying air and a heating device for heating. The airflow generated by the fan is heated by the heating device to form hot air; the heating device can be a heating wire.

[0111] By measuring the temperature of the hot air flowing through the air inlet 211, the heating power of the heating device is regulated to maintain the temperature of the hot air flowing through the air inlet 211 at a preset value. This ensures that the temperature inside the heating chamber does not exceed the temperature at the air inlet 211. Therefore, simply monitoring the temperature at that location can prevent the temperature inside the hot air chamber 21 from being too high.

[0112] Furthermore, since the diaphragm 3 can only withstand a limited amount of hot air, the time it takes for the diaphragm 3 to reach the hot-pressed state is controlled by adjusting the air flow rate of the fan within the diaphragm's maximum temperature tolerance, i.e., maintaining the inlet air temperature within a preset temperature range. Accordingly, increasing the air flow rate can accelerate the diaphragm 3's heating rate while limiting its maximum temperature.

[0113] Preferably, the temperature of the hot air flowing through the air inlet 211 is the inlet air temperature, which is 5-20° C. higher than the hot pressing temperature;

[0114] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing a heat exchanger, characterized in that: The diaphragm used to form the heat exchange plate is fed into an injection mold, the injection mold is closed to clamp the edge of the diaphragm, and then a structural frame portion is formed at a predetermined position on the edge of the diaphragm by injection molding, so that an integrated structure is formed between the diaphragm and the structural frame portion; After the injection mold is clamped and fixed with the diaphragm, a hot air cavity for heating the diaphragm is provided in the injection mold, and the diaphragm is located in the hot air cavity; While the structural frame portion is being injected, hot air is introduced into the hot air chamber to heat the diaphragm to a preset hot pressing temperature and continue for a preset time to soften the diaphragm to a hot pressing state suitable for hot pressing deformation treatment; A hot pressing mold is provided in the injection mold. When the diaphragm is heated to a hot pressing state, the hot pressing mold is closed to hot press and deform the diaphragm into a structured flow guide rib and a heat exchange portion having multiple heat exchange channels to form a molded heat exchange plate. The formed heat exchange fins are taken out and stacked one after another from bottom to top to form a heat exchanger.

2. The method for preparing a heat exchanger according to claim 1, wherein: The diaphragm is fed into the injection mold by a feeding robot arm; The feeding robot arm is provided with a film absorbing plate for receiving the film and a heating device for heating the film absorbing plate. The film absorbing plate is provided with a plurality of negative pressure holes connected to a vacuum pump so that the film is attached to the film absorbing plate. The heating device preheats the diaphragm by utilizing the time when the feeding robot arm transfers the diaphragm and the time when the diaphragm waits to be fed into the injection mold.

3. The method for preparing a heat exchanger according to claim 2, wherein: The film absorbing plate is provided with a blowing hole for ejecting gas; When the feeding robot arm delivers the diaphragm to the desired position, the negative pressure hole stops adsorbing the diaphragm, and the blowing hole sprays gas to separate the diaphragm from the film absorbing plate.

4. The method for preparing a heat exchanger according to claim 1, wherein: In the hot air chamber, according to the arrangement position of the diaphragm, the hot air chamber is divided into an upper air chamber and a lower air chamber, and the upper air chamber and the lower air chamber are both provided with air inlets connected to a pipe for inputting hot air, so that the hot air flows through the upper and lower surfaces of the diaphragm, so that the diaphragm is heated to a preset hot pressing temperature and maintained for a preset time, so that the diaphragm is softened to a hot pressing state suitable for hot pressing deformation treatment; The direction of the air inlet of the upper air cavity is opposite to the direction of the air inlet of the lower air cavity.

5. The method for preparing a heat exchanger according to claim 3, wherein: There are at least two injection molds, which are located on both sides of the feeding robot arm. The heat exchange fins in the injection mold are taken out by the taking-out robot arm and moved to the stacking platform for stacking; The feeding robot arm feeds the film into an injection mold and then returns to the storage platform for stacking the film, absorbs and takes the next film to be processed, and preheats the film through the heating device until another injection mold is opened; After the injection mold is opened, the material taking robot arm takes away the formed heat exchange plate, and the material feeding robot arm feeds the preheated diaphragm into the injection mold and then returns to the storage platform.

6. The method for preparing a heat exchanger according to claim 5, wherein: The retrieving mechanical arm is provided with a retrieving mounting plate, and the retrieving mounting plate is provided with a retrieving working area that can cover the surface of the heat exchange plate; The heat exchange plate is provided with a main body plane area, and the main body plane area is the area of ​​the diaphragm that has not been subjected to hot pressing and injection molding treatments; The material taking working area is provided with a plurality of adsorption devices corresponding to the plane area of ​​the main body; The material taking mechanical arm absorbs the main plane area of ​​the heat exchange plate through the adsorption device to pick up the heat exchange plate.

7. The method for preparing a heat exchanger according to claim 6, wherein: On the retrieving mounting plate, the retrieving working area is provided with a plurality of top pressing devices corresponding to the structural frame portion; After the retrieving mechanical arm receives the heat exchanger fins, it performs a stacking and placement operation on the stacking platform; The stacking operation includes: The heat exchange fins adsorbed by the adsorption device are placed directly above the heat exchange fins on the stacking platform by the retrieving mechanical arm; Then, when the adsorption device stops the adsorption work, the pressing device presses down the heat exchange plate to completely separate the heat exchange plate from the adsorption device and press the heat exchange plate on the stacking platform.

8. The method for preparing a heat exchanger according to claim 4, wherein: The heating device for delivering hot air to the air inlet includes a fan for supplying air and a heating device for heating, wherein the airflow generated by the fan is heated by the heating device to form hot air; By measuring the temperature of the hot air flowing through the air inlet, the heating power of the heating device is regulated so that the temperature of the hot air flowing through the air inlet is maintained at a preset value.

9. The method for preparing a heat exchanger according to claim 8, wherein: The temperature of the hot air flowing through the air inlet is the inlet air temperature, which is 5-20°C higher than the hot pressing temperature; The inlet air temperature is maintained within a preset temperature range, and the time for the diaphragm to heat up to the hot pressing state is controlled by regulating the air flow rate of the fan.

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