Heat exchanger and preparation method thereof

Abstract

The invention discloses a heat exchanger and a preparation method thereof.The preparation method of the heat exchanger comprises the steps that a membrane is fed into an injection mold, and a structural frame part is formed at the preset position of the edge of the membrane in an injection molding mode so that an integrated structure can be formed between the membrane and the structural frame part; a hot air cavity used for heating the membrane is formed in the injection mold, and hot air starts to be introduced into the hot air cavity while the structural frame part is subjected to injection molding, so that the temperature of the membrane is increased to a preset hot pressing temperature, and the membrane is softened to a hot pressing state suitable for hot pressing deformation treatment; a hot-pressing mold is arranged in the injection mold, after the membrane is heated to a hot-pressing state, the hot-pressing mold is closed, and a heat exchange part is formed on the membrane through hot-pressing deformation, so that a formed heat exchange sheet is formed; and taking out the formed heat exchange sheets, and successively overlapping the formed heat exchange sheets from bottom to top to form the heat exchanger. The heat exchanger is simple and stable in structure and high in production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange equipment, and in particular to a heat exchanger and a method for preparing the 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 assembly of the heat exchange fins and the frames, and then the overlapping assembly. Since the plate-type air heat exchanger generally requires a large number of heat exchange fins to be assembled, the assembly process of the heat exchange fins and the frames will seriously hinder the improvement of production efficiency.

[0003] On the other hand, for a heat exchanger with a larger area, when the size of its 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 may 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, which has 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 in an alternating concave and convex manner to form a heat exchange portion having a plurality of heat exchange channels on the upper and lower surfaces of the heat exchange fins;

[0007] 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 overlap gap is left between the heat exchange plates;

[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 arranged between the air inlet and the heat exchange part to form a flow guiding channel for guiding the heat exchange part in sections.

[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 of 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 of the above solution, the heat exchange part has a wave-like structure, and the wave-like 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 fin between adjacent guide walls, and the lower surface of the raised ridge forms the heat exchange channel.

[0015] As an improvement of the above solution, at least one of the raised ridges is provided with a positioning recessed portion, 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 of 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 of the above solution, the heat exchanger fins are divided into male heat exchanger fins and female heat exchanger fins, and the male heat exchanger fins and the female heat exchanger 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 of the above solution, the heat exchanger is an integrated structure.

[0022] A method for preparing a heat exchanger, wherein a diaphragm for forming a heat exchange plate is fed into an injection mold, the injection mold is closed to clamp and fix the edge of the diaphragm, and then a structural frame portion is formed at a preset position of 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 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 exchanger fins are taken out, and the formed heat exchanger fins are stacked one by one from bottom to top to form a heat exchanger.

[0027] As an improvement of 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 utilizes the time when the feeding robot arm transfers the diaphragm and the time when the diaphragm waits to be fed into the injection mold to preheat the diaphragm.

[0030] As an improvement of 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 of the above scheme, in the hot air chamber, according to the setting 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 the pipeline 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;

[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 of the above solution, at least two injection molds are provided, and they are respectively located on both sides of the feeding robot arm. The heat exchanger in the injection mold is 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 membrane into the injection mold, and then returns to the storage platform.

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

[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 is not subjected to hot pressing and injection molding treatment;

[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 adsorbs the main body plane area of ​​the heat exchange plate through the adsorption device to receive the heat exchange plate.

[0041] As an improvement of the above solution, on the material taking installation plate, the material taking working area is provided with a plurality of top pressing devices corresponding to the structural frame part;

[0042] After the material taking mechanical arm receives the heat exchanger plate, it performs stacking and placement operation on the stacking platform;

[0043] The stacking operation includes:

[0044] The heat exchanger plates adsorbed by the adsorption device are placed correspondingly on top of the heat exchanger plates on the stacking platform by the material taking 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 of the above solution, the heating device for delivering hot air to the air inlet includes a fan for delivering air and a heating device for heating, and 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 of the above solution, the temperature of the hot air flowing through the air inlet is the inlet temperature, and the inlet temperature is 5 to 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 a hot pressing state is controlled by adjusting the air supply 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 a plurality of 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 the 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 overlap gap is left between the heat exchange plates to ensure the gas flow space between the heat exchange plates.

[0053] Moreover, the structural frame portion is provided with two notches to respectively form an air inlet and an air outlet on both sides of the heat exchange channel; 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 airflow 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, in the preparation process of the heat exchanger, the present invention uses an injection mold and a hot pressing mold in the injection mold to perform injection molding of the structural frame portion of the diaphragm and hot pressing molding of the heat exchange portion, so that the molded heat exchanger is a product of an integrated structure, eliminating the need for the later assembly of the diaphragm and the frame in the existing production technology to assemble the heat exchanger. Therefore, after the mold is opened and the molded heat exchanger is taken out, the present invention can directly perform the next step of stacking to directly produce a finished heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0056] Figure 2 It is a schematic diagram of the local structure of the upper surface of the heat exchange plate of the present invention;

[0057] Figure 3 It 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 It is a schematic diagram of the partial structure of the lower surface of the heat exchange plate of the present invention;

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

[0060] Figure 6 It 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 the 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] Fig. 9 It is a schematic structural 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 further described in detail below with reference to the accompanying drawings.

[0065] See also Figure 1-5 The 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 in an alternating concave and convex manner 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 part 11 to form a guide channel 13a for guiding the heat exchange part 11 in sections. Preferably, a plurality of structural guide ribs 13 are provided between the air outlet 122 and the heat exchange part 11 to form a guide channel for guiding the heat exchange part 11 in sections.

[0069] Specifically, in order to facilitate the overlapping assembly of the heat exchanger plates 1, the upper and lower end surfaces of the structural frame portion 12 are respectively provided with mutually adaptable 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 the spacing support between adjacent heat exchanger plates 1. Therefore, at the gap, the upper and lower surfaces of the heat exchanger plates 1 are respectively provided with support columns 14 for the structural frame portion 12 and the plug-in portion 124. A plurality of support columns 14 are provided along the width direction of the gap, and a spacing is left between adjacent support columns 14 to maintain the flow of 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 missing two sides, and the two missing sides form two gaps, namely the air inlet 121 and the air outlet 122.

[0072] The heat exchange part 11 is in a wave-like structure, and the wave-like structure 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 fin 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 is in a folding fan structure, that is, a W-shaped wave structure.

[0074] The wave-like structure can make the heat exchange part 11 have longitudinal bending resistance, thereby greatly weakening the up and down vibration of the heat exchange part 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 adjacent heat exchanger plates 1 and prevent the guide walls 111 from sticking 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 bayonet adapted to the raised ridge B. Thus, the raised ridge B can be stably located in the heat exchange channel A, while limiting contact with the adjacent two sides to the guide wall 111 .

[0078] For the convenience of description, the heat exchanger 1 is divided into a male heat exchanger 1a and a female heat exchanger 1b, and the male heat exchanger 1a and the female heat exchanger 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 overall 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, for the arrangement of the positioning support top 113, the male heat exchanger fin 1a and the female heat exchanger fin 1b are both provided with positioning support tops at intervals of a preset number of raised ridges B, and the positions of the positioning support tops provided on the male heat exchanger fin 1a and the female heat exchanger fin 1b are staggered. If the male heat exchanger fin 1a is not provided with 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 fed 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 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 preset hot pressing temperature and continue for a preset 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 inside the injection mold 2. When the diaphragm 3 is heated to a hot pressing state, the hot pressing mold 4 is closed to hot press and deform the structural guide ribs 13 and the heat exchange portion 11 having multiple heat exchange channels A on the diaphragm 3; the heat exchange portion 11 is a folding fan structure, that is, a W-shaped wave structure, and the structural guide ribs 13 are strip 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 molded heat exchanger fins 1 can be taken out by hand or by the feeding robot 5, and the molded 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 time consumed by the hot pressing process as a whole can be close to the injection molding process which consumes relatively longer time.

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

[0092] The feeding robot 5 is provided with a film absorbing plate 51 for receiving the film 3 and a heating device 52 for heating the film absorbing plate 51. The film absorbing plate 51 is provided with a plurality of negative pressure holes connected to a vacuum pump so that the film 3 can be attached to the film absorbing plate 51. Such a material taking method, i.e., the film 3 is attached to the surface of the film absorbing plate 51, can keep the film 3 flat, so that the subsequent injection mold 2 can be used to accurately clamp and fix the film 3. At the same time, the film 3 can avoid wrinkles when being transferred and placed in the injection mold 2.

[0093] Moreover, the setting of the heating device 52 can preheat the film 3 by utilizing the time when the feeding robot 5 transfers the film 3 and the time when the film 3 waits to be fed into the injection mold 2, thereby shortening the time when the film 3 is heated to the hot pressing state. The heating device 52 is preferably a heating film or a heating sheet in the prior art, 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 restored to the normal pressure state. 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 7, for step 4, in order to speed up the heating efficiency of the diaphragm 3, in the hot air chamber 21, according to the setting position of the diaphragm 3, the hot air chamber 21 is divided into an upper air chamber 21a and a lower air chamber 21b, and the upper air chamber 21a and the lower air chamber 21b are both provided with an air inlet 211 connected to a pipeline 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, so that the diaphragm 3 can be heated more evenly, avoiding the problem of excessively high local temperature in the part of the diaphragm 3 near the air inlet 211. For example, when the hot air of 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 of 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 setting that 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 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 they are respectively 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. The injection mold 2 and the hot pressing mold 4 are both opened to allow the diaphragm 3 to be processed to be placed, 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 A injection mold is opened, the feeding robot arm 5 feeds the diaphragm 3 into the A injection mold, and the A injection mold performs 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 B injection mold is opened;

[0101] 1.3 After the B injection mold is opened, the material taking robot arm 6 takes away the formed heat exchanger plate 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 A injection mold is opened.

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

[0104] The heat exchanger is provided with a main body plane area, which is the area of ​​the membrane 3 that has not been subjected to hot pressing and injection molding. The material-retrieving work area is provided with a plurality of adsorption devices corresponding to the main body plane area. The material-retrieving mechanical arm 6 adsorbs the main body plane area of ​​the heat exchanger through the adsorption device 61 to pick up the heat exchanger. The adsorption device 61 includes a suction cup connected to a vacuum pipeline 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 in the sleeve. The sleeve rod is installed in the sleeve to compress the spring, so that the suction cup can flexibly contact the heat exchanger.

[0105] On the material taking installation plate, the material taking work area is provided with a plurality of top pressing devices 62 corresponding to the structural frame portion;

[0106] After the material taking mechanical arm 6 receives the heat exchanger sheet, it performs a stacking and placing operation on the stacking platform 7;

[0107] The stacking operation includes:

[0108] The heat exchanger plates adsorbed by the adsorption device 61 are placed on the stacking platform 7 by the material taking mechanical arm 6;

[0109] Then, when the adsorption device 61 stops adsorption, the pressing device 62 presses down the heat exchanger sheet, so that the heat exchanger sheet is completely separated from the adsorption device 61, and the heat exchanger sheet on the stacking platform 7 is pressed together. The pressing device 62 can be an existing pneumatic telescopic rod device, and the pressing device 62 presses the structural frame part to realize the unloading of the heat exchanger sheet and the stacking and compacting of the heat exchanger sheet, which can prevent the relatively weak plane area of ​​the body from being penetrated.

[0110] For step 4, the heating device 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 adjusted to maintain the temperature of the hot air flowing through the air inlet 211 at a preset value. Thus, the temperature in the heating chamber does not exceed the temperature at the air inlet 211, and the temperature in the hot air chamber 21 can be prevented from being too high by only monitoring the temperature there.

[0112] Furthermore, since the hot air temperature that the diaphragm 3 can withstand is limited, the time for the diaphragm 3 to heat up to the hot pressing state is controlled by adjusting the air flow rate of the fan within the limit temperature range that the diaphragm 3 can withstand, that is, maintaining the air inlet temperature within the preset temperature range. Accordingly, the air flow rate can be increased to accelerate the heating rate of the diaphragm 3 while limiting the maximum temperature of the diaphragm 3.

[0113] Preferably, the temperature of the hot air flowing through the air inlet 211 is the inlet temperature, and the inlet temperature is 5 to 20° C. greater than the hot pressing temperature;

[0114] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle 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 and fix the edge of the diaphragm, and then a structural frame portion is formed at a preset position of 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 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 to form a structure guide rib and a heat exchange portion with multiple heat exchange channels to form a molded heat exchange plate. The formed heat exchanger fins are taken out, and the formed heat exchanger fins are stacked one by one from bottom to top to form a heat exchanger.

2. The method for preparing a heat exchanger according to claim 1, characterized in that: 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 utilizes the time when the feeding robot arm transfers the diaphragm and the time when the diaphragm waits to be fed into the injection mold to preheat the diaphragm.

3. The method for preparing a heat exchanger according to claim 2, characterized in that: 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, characterized in that: In the hot air chamber, according to the setting 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 the pipeline 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, characterized in that: The injection molds are provided with at least two and are respectively located on both sides of the feeding robot arm. The heat exchanger 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 membrane into the injection mold, and then returns to the storage platform.

6. The method for preparing a heat exchanger according to claim 5, characterized in that: 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 is not subjected to hot pressing and injection molding treatment; 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 adsorbs the main body plane area of ​​the heat exchange plate through the adsorption device to receive the heat exchange plate.

7. The method for preparing a heat exchanger according to claim 6, characterized in that: On the material taking installation plate, the material taking working area is provided with a plurality of top pressing devices corresponding to the structural frame part; After the material taking mechanical arm receives the heat exchanger plate, it performs stacking and placement operation on the stacking platform; The stacking operation includes: The heat exchanger plates adsorbed by the adsorption device are placed correspondingly on top of the heat exchanger plates on the stacking platform by the material taking 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, characterized in that: The heating device for delivering hot air to the air inlet includes a fan for delivering 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, characterized in that: The temperature of the hot air flowing through the air inlet is the inlet temperature, and the inlet temperature is 5 to 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 a hot pressing state is controlled by adjusting the air supply flow rate of the fan.

10. A heat exchanger, characterized in that: It comprises a plurality of heat exchange fins, wherein the middle part of the heat exchange fins is deformed in an alternating concave and convex manner to form a heat exchange portion having a plurality of heat exchange channels on the upper and lower surfaces of the heat exchange fins; 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 overlap gap is left between the heat exchange plates; 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; On the heat exchange plate, a plurality of structural flow guiding ribs are arranged between the air inlet and the heat exchange part to form a flow guiding channel for guiding the heat exchange part in sections.

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