CN112108844B - Heat exchanger production process convenient for leak repairing - Google Patents
Heat exchanger production process convenient for leak repairing Download PDFInfo
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- CN112108844B CN112108844B CN202010985140.4A CN202010985140A CN112108844B CN 112108844 B CN112108844 B CN 112108844B CN 202010985140 A CN202010985140 A CN 202010985140A CN 112108844 B CN112108844 B CN 112108844B
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- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
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Abstract
The application relates to a heat exchanger production convenient to mend technology hourglass, it relates to heat exchanger production technical field, and it includes following step: s1, processing accessories; s2, assembling the core body of the prototype; s3, shaping; s4, forming a heat exchanger; s5, testing the sealing performance; s6, repair welding of a heat exchanger; and S7, polishing and painting. Wherein, at the in-process of heat exchanger repair welding, blow clean leaking the solder joint earlier, preheat the heat exchanger again, leak repair the solder joint through PSI fast mending glue and welding seam sealed glue afterwards, the welding seam sealed glue is through the injection gun splendid attire that has cold-stored function. And pushing the heat exchanger subjected to repair welding into a drying box for drying and heating again until the quick repair glue and the welding seam sealant are completely cured. This application has that the benefit is leaked comparatively conveniently and less to the damage of each part of heat exchanger, is favorable to promoting the production efficiency of heat exchanger and can reduce the effect of the disability rate of heat exchanger.
Description
Technical Field
The application relates to the field of heat exchanger production, in particular to a heat exchanger production process convenient for leakage repairing.
Background
The plate heat exchanger is an energy-saving device for transferring heat between materials between two or more fluids with different temperatures, and the heat is transferred from the fluid with higher temperature to the fluid with lower temperature, so that the temperature of the fluid reaches the index specified by the process to meet the requirements of process conditions, and meanwhile, the plate heat exchanger is one of main devices for improving the energy utilization rate.
The standard plate heat exchanger consists of a partition plate, fins, a long seal, a short seal, a left seal and a right seal. The fin is placed between two adjacent partition plates to form an interlayer, a pair of long sealing strips seal the long edge of one interlayer to form a heat medium interlayer, a pair of short sealing strips seal the short edge of the other interlayer to form a cold medium interlayer, the heat medium interlayer and the cold medium interlayer are overlapped from bottom to top and are arranged at intervals, the lower part of the heat medium interlayer at the lowest layer is connected with a lower cover plate, the upper part of the cold medium interlayer at the uppermost layer is connected with an upper cover plate, and finally the core body is formed by brazing into a whole. One end of the core body is connected with the left end socket, and the other end of the core body is connected with the right end socket to form the plate-fin heat exchanger. Wherein, the left end enclosure is provided with a heat medium inlet, and the right end enclosure is provided with a heat medium outlet.
In the process of producing the heat exchanger in the related art, unqualified products often appear when the welded heat exchanger is subjected to a tightness test. Most of the rejected products are due to deformation of the fins during assembly, so that welding leakage points occur during brazing. In most cases, the welding missing points are repaired by adopting a repair welding mode so as to reduce unqualified products.
Aiming at the related technologies, the inventor thinks that the repair welding mode is adopted to repair the welding spot, the heat exchanger needs to be disassembled again and then welded and repaired, the operation difficulty of repair welding is high, and the rejection rate of the heat exchanger is easy to increase.
Disclosure of Invention
In order to reduce the problem that the difficulty of repairing the welding spot of the heat exchanger is large, the application provides a heat exchanger production process convenient for leakage repair.
The application provides a heat exchanger production technology convenient to mending-leakage adopts following technical scheme:
a heat exchanger production process convenient for leakage repair comprises the following steps:
processing accessories: processing the plate into a lower cover plate, an upper cover plate, a partition plate, fins, a long seal, a short seal, a left seal and a right seal which meet the design requirements;
assembling a core body of the prototype: firstly, placing a lower cover plate in an assembling device, then assembling a partition plate, a fin and a long seal strip into a heat medium interlayer and stacking the heat medium interlayer above the lower cover plate, then assembling the partition plate, the fin and a short seal strip into a cold medium interlayer above the heat medium interlayer, and then sequentially stacking and assembling the heat medium interlayer and the cold medium interlayer according to the method to a specified layer number so as to place an upper cover plate to form a prototype core;
forming a heat exchanger: feeding the rudiment core body into a brazing furnace for brazing; then sending the core body after brazing into an argon welding processing area, and welding the left end enclosure, the right end enclosure and the core body to form a heat medium channel by the heat medium interlayer, the left end enclosure and the right end enclosure;
test of sealing property: blocking a heat medium outlet through a plug, connecting an air pipe at a heat medium inlet of a heat exchanger, then placing the heat exchanger into a water pool, introducing 0.11-0.16MPa of compressed gas into the heat medium inlet, and observing whether bubbles are generated in the water pool;
if no bubble exists, the test is qualified, and the step of polishing and painting is carried out; if bubbles continuously appear at local parts, the test is unqualified, the heat exchanger has welding spot leakage, and the step of heat exchanger leakage repairing is carried out;
leak repairing of a heat exchanger: adopting leakage repairing glue to repair leakage at the position of a leakage welding point generated by the heat exchanger, then heating the heat exchanger coated with the leakage repairing glue until the sealant is solidified, and carrying out test sealing treatment on the heat exchanger subjected to leakage repairing again;
polishing and paint spraying: and (4) sending the heat exchanger qualified in the test into a packaging area for polishing, spraying paint and packaging.
Through adopting above-mentioned technical scheme, utilize the mending-leakage glue to mend the hourglass, can save the split step of rewelding the heat exchanger, it is comparatively convenient and less to the damage of each part of heat exchanger to mend the hourglass, is favorable to promoting the production efficiency of heat exchanger and can reduce the disability rate of heat exchanger.
Optionally, the heat exchanger leakage repairing step includes the following steps:
a: cleaning welding spot leakage: draining water in the heat exchanger, and blowing water and impurities around the welding spot of the heat exchanger by compressed air;
b: and (3) leakage repairing: the leakage repairing glue adopts PSI quick repairing glue and welding seam sealant, firstly, the PSI quick repairing glue is used for coating the hole bottom of the leakage welding spot, and after the PSI quick repairing glue is solidified, the hole bottom of the leakage welding spot is blocked and forms a closed cavity with the hole wall of the leakage welding spot; then injecting the welding seam sealant into the welding leakage point, and stopping injecting the sealant when the sealant liquid glue of the welding seam flows outwards; finally, the PSI quick repair glue is used for plugging the orifices of the welding leakage points;
c: accelerating solidification: and (3) placing the heat exchanger subjected to leakage repairing glue leakage repairing into a drying box for heating for 40-50min at the temperature of 170-180 ℃, and accelerating the solidification of the leakage repairing glue.
Through adopting above-mentioned technical scheme, PSI mends gluey soon and belongs to the epoxy glue, is the daub form before the solidification, is difficult for drippage when the shutoff leaks the solder joint hole bottom, and can solidify at room temperature, be convenient for form the airtight cavity that splendid attire welding seam was sealed with the pore wall of leaking solder joint department. The welding seam sealing glue needs to be heated and cured, and the PSI quick repair glue can also be heated and cured, so that the PSI quick repair glue and the PSI quick repair glue can be heated and cured together, the leaked welding points can be repaired well, and the sealing performance of the leaked welding points can be kept.
Optionally, before the leakage repairing step, the heat exchanger is pushed into a drying oven to be preheated for 18-25min, and the preheating temperature is 70-90 ℃.
Through adopting above-mentioned technical scheme, preheat the heat exchanger earlier before the benefit leaks and can be convenient for be used for sealing the PSI fast mending glue fast solidification of leaking the welding spot, reduce the condition emergence of PSI fast mending glue liquid water clock, and also can solidify the welding seam sealed glue in advance, reduce the welding seam sealed glue and move the condition emergence of spilling the hourglass to the in-process of drying cabinet at the heat exchanger, have the effect of being convenient for promote the benefit of leaking quality.
Optionally, in the leakage repairing step, the welding seam sealant is contained in an injection gun, the injection gun comprises an injection needle, a rubber container, a connecting cylinder detachably connected with the rubber container, and an extrusion column inserted into the connecting cylinder, the injection needle is hollow, an injection hole is formed in the peripheral wall of the injection needle facing the needle point, and one side of the injection needle, away from the needle point, is inserted into the rubber container; the end of the rubber containing cylinder, which is far away from the injection needle, is provided with an opening and is communicated with the connecting cylinder; the extrusion column is pushed towards the bottom of the glue containing barrel from one side of the connecting barrel, which is far away from the glue containing barrel, and the outer wall of the extrusion column is attached to the inner wall of the glue containing barrel.
Through adopting above-mentioned technical scheme, separation flourishing packing element and connecting cylinder, pour into the sealed glue of welding seam towards the opening of flourishing packing element after, can refrigerate the sealed container of glue of former splendid attire welding seam. And then the glue containing barrel and the connecting barrel are connected, the extrusion column is pushed towards the bottom of the glue containing barrel, and the welding seam sealant is extruded into the injection needle and is injected into the hole at the welding point through the injection hole along with the reduction of the accommodating space in the glue containing barrel. The injection gun can be used for containing and injecting the welding seam sealant, the welding seam sealant can be conveniently stored during repair welding by adopting the injection gun, and the waste of the welding seam sealant is reduced during injection.
Optionally, the outer wall of the rubber containing cylinder is connected with a refrigerating plate, the refrigerating plate is hollow and filled with dry ice, and an air outlet is formed in the side wall of one end, facing the connecting cylinder, of the refrigerating plate.
Through adopting above-mentioned technical scheme, the setting of cold-stored board is used for prolonging the outdoor save time of the sealed glue of welding seam in flourishing packing element, reduces the sealed condition emergence of rotten of glue of welding seam. Adopt the dry ice to carry out cold-stored mode, the sealed cold-stored demand of sealed glue of welding seam of the splendid attire in the flourishing packing element that can great degree is satisfied in the splendid attire of dry ice, and the venthole is used for discharging the carbon dioxide that the dry ice sublimes and form.
Optionally, a handheld column is connected to the peripheral wall of the refrigerating plate, an article placing opening is formed in the handheld column, and the handheld column is hollow and is respectively communicated with the article placing opening and the refrigerating plate; the storage opening is connected with a sealing cover.
Through adopting above-mentioned technical scheme, adopt handheld post can be convenient for take the injection gun, and can be convenient for increase the storage capacity of dry ice, the sealed outdoor cold storage time of gluing of extension welding seam, sealed lid can be convenient for seal and put the thing mouth, reduces the carbon dioxide that the dry ice sublimation formed and reveals the condition emergence that reduces cold-stored effect from putting thing mouth department, and can reduce the low temperature carbon dioxide frostbite staff's that reveals the condition emergence.
Optionally, an insulating layer is sleeved on the peripheral wall of the handheld column.
Through adopting above-mentioned technical scheme, the heat preservation can slow down the sublimation of dry ice, is favorable to prolonging the sealed save time of gluing of welding seam, and can reduce the low temperature frostbite staff's of dry ice condition and take place.
Optionally, the peripheral wall of the injection needle is connected with a transparent bowl-shaped cover in a sliding manner, and the bowl-shaped cover can be covered on the hole of the welding spot.
By adopting the technical scheme, the bowl-shaped cover can cover the hole opening of the welding spot leakage when the injection gun is used for leakage repair, and the overflow of the welding seam sealant is reduced, so that the waste of the welding seam sealant and the cleaning of the welding seam sealant at the hole opening of the welding spot leakage are reduced. The sealing cover is made of transparent materials, so that the filling condition of the welding spot leakage can be observed conveniently.
Optionally, a first magnetic ring is connected to a circumferential wall of one end of the injection needle facing the rubber container, a second magnetic ring is connected to one side of the bowl-shaped cover facing the first magnetic ring, and the first magnetic ring and the second magnetic ring are magnetically attracted.
By adopting the technical scheme, when the welding spot is larger than the coverage range of the bowl-shaped cover or the welding spot is too small, the bowl-shaped cover does not need to be used, the bowl-shaped cover can slide upwards towards the glue containing cylinder, and the bowl-shaped cover is connected and fixed through the magnetic attraction of the first magnetic ring and the second magnetic ring.
Optionally, a limiting block is connected to a circumferential wall of one end, close to the needle tip, of the injection needle, and the second magnetic ring is located between the limiting block and the first magnetic ring.
Through adopting above-mentioned technical scheme, the stopper is used for restricting the stroke that slides of bowl shape cover, reduces the hidden danger that bowl shape cover dropped.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the leakage repairing glue is adopted at the position of the heat exchanger where the leakage welding spot is generated for leakage repairing, so that the effects of more convenient leakage repairing, less damage to each part of the heat exchanger, contribution to improving the production efficiency of the heat exchanger and reduction of the rejection rate of the heat exchanger can be achieved;
2. the arrangement of the preheating heat exchanger before leakage repair can realize the rapid solidification of the PSI quick repair glue for sealing the leakage welding spot, reduce the occurrence of leakage of the PSI quick repair glue solution, and can also pre-solidify the welding seam sealant, thereby being convenient for improving the effect of leakage repair quality;
3. through the setting of syringe needle, flourishing packing element, connecting cylinder, extrusion column, cold-stored board and bowl shape cover, can play the sealed glue of the save welding seam of the great degree at the mending-leakage in-process, and can reduce the sealed extravagant effect of gluing of welding seam at the injecting glue in-process.
Drawings
Fig. 1 is an exploded view of a heat exchanger of the related art.
Fig. 2 is a schematic flow structure diagram of a production process of a heat exchanger according to an embodiment of the present application.
Fig. 3 is a schematic overall structure diagram of an assembling device according to an embodiment of the present application.
Fig. 4 is a schematic view of the overall structure of the fixing device according to the embodiment of the present application.
Fig. 5 is a schematic view of the overall structure of an injection gun according to an embodiment of the present application.
FIG. 6 is a schematic view showing the structure of the injection gun according to the embodiment of the present invention without the insulating layer and the bowl-shaped cover.
Description of reference numerals: 1. a core body; 11. a lower cover plate 12, an upper cover plate; 13. a partition plate; 14. a fin; 15. a long seal; 16. a short seal; 17. a left end enclosure; 171. a thermal medium inlet; 18. a right end enclosure; 181. a thermal medium outlet; 2. mounting a support; 21. a sliding groove; 22. a first upright post; 23. a second upright post; 24. mounting grooves; 25. a sliding block; 4. an injection gun; 41. an injection needle; 411. an injection hole; 42. a glue containing cylinder; 43. a connecting cylinder; 44. extruding the column; 45. a cold storage plate; 451. an air outlet; 46. a hand-held post; 461. a storage port; 462. a sealing cover; 463. a heat-insulating layer; 47. a bowl-shaped cover; 471. a first magnetic ring; 472. a second magnetic ring; a limiting block; 5. a work table; 51. a guide bar; 52. \ 21274; a shaped clamping plate; 53. a block for raising; 6. a fixing device; 61. a lower pressing plate; 62. an upper pressure plate; 63. a connecting bolt; 64. and locking the nut.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
A standard plate-fin heat exchanger in the related art is shown in fig. 1, and includes a partition plate 13, fins 14, a long seal 15, a short seal 16, an upper cover plate 12, a lower cover plate 11, a left end enclosure 17, and a right end enclosure 18. Fins 14 are arranged between two adjacent partition plates 13 to form an interlayer, a pair of long seals 15 block the long sides of the fins 14 in one interlayer to form a heat medium interlayer, and a pair of short seals 16 block the short sides of the fins 14 in the other interlayer to form a cold medium interlayer. The heat medium interlayers and the cold medium interlayers are overlapped from bottom to top and are arranged at intervals, and a partition plate 13 is shared between the adjacent heat medium interlayers and the adjacent cold medium interlayers. The lower part of the heat medium interlayer at the lowest layer is connected with a lower cover plate 11, the upper part of the cold medium interlayer at the uppermost layer is connected with an upper cover plate 12, and finally the core body 1 is formed by brazing into a whole. One end of the core body 1 is connected with a left end socket 17, and the other end is connected with a right end socket 18 to form the plate-fin heat exchanger. Wherein, a heat medium inlet 171 is arranged on the left end socket 17, and a heat medium outlet 181 is arranged on the right end socket 18.
The embodiment of the application discloses a heat exchanger production process convenient for leakage repairing. Referring to fig. 1 and 2, a process for producing a heat exchanger includes the steps of: s1, processing accessories; s2, assembling the prototype core body 1; s3, shaping; s4, forming a heat exchanger; s5, testing the sealing performance; s6, repair welding of a heat exchanger; and S7, polishing and painting. Each step is described below.
S1, processing accessories: the machining method comprises the steps of machining materials such as purchased plates and strips into a lower cover plate 11, an upper cover plate 12, a partition plate 13, fins 14, long seals 15, short seals 16, a left end enclosure 17 and a right end enclosure 18 which meet design requirements in a machining area, machining holes of a heat medium inlet 171 and other requirements which meet the assembly requirements on the left end enclosure 17 according to a drawing, and machining holes of a heat medium outlet 181 and other requirements which meet the assembly requirements on the right end enclosure 18 according to the drawing.
Referring to fig. 3, S2, core 1 in the assembled blank: the core 1 of the prototype is installed in the assembly area by an assembling device, which comprises a workbench 5, installation supports 2 placed on the workbench 5 and oppositely arranged, and a first upright 22 and a second upright 23 installed on each installation support 2. Two parallel guide rods are connected to two ends of the workbench 5 in the width direction of the mounting supports 2, and the mounting supports 2 are located between the guide rods 51 and arranged in a sliding manner along the length direction of the guide rods 51, so that the two mounting supports 2 can slide directionally and can be relatively close to or far away from under the guide of the guide rods. The two ends of each mounting support 2 on the guide rod 51 are clamped with a v-shaped clamping plate 52, a v-shaped clamping plate 21274, the distance of the opening of the v-shaped clamping plate 52 is smaller than the width of the guide rod, the opening of the v-shaped clamping plate 52 is clamped on the guide rod towards one side of the workbench 5, and the v-shaped clamping plates 2127452 are positioned on the two ends of each mounting support 2 in the length direction and used for fixing the mounting supports 2 when the sliding of the mounting supports 2 is stopped. The heightening blocks 53 are placed between the mounting supports 2 on the workbench 5, the height of the heightening blocks 53 is larger than that of the guide rods 51, and when the core body 1 of the prototype is assembled, the lower cover plate 11 can be placed on the heightening blocks 53, so that a space convenient for a lifting rope to pass is reserved between the core body 1 of the prototype after the subsequent assembly and the workbench 5.
Referring to fig. 3, each mounting bracket 2 can be mounted with at least one set of first upright 22 and second upright 23, and in this embodiment, two sets of first upright 22 and second upright 23 are mounted on one mounting bracket 2. The relative lateral wall that sets up of two erection supports 2 establishes to the working face, and first stand 22 and second stand 23 perpendicular workstation 5 just install on the working face, and first stand 22 is fixed in the edge of erection support 2, and two second stands 23 all are located between two first stands 22.
Referring to fig. 3, two sliding grooves 21 parallel to the workbench 5 are formed in one side of the mounting support 2 on the working surface, the sliding grooves 21 are through grooves with T-shaped cross sections, a sliding block 25 with a T-shaped cross section is connected to one side of the first upright column 22 and the second upright column 23 facing the sliding grooves 21 through screws, and the sliding block 25 slides into the sliding grooves 21 from one end of the sliding grooves 21, so that the first upright column 22 and the second upright column 23 are connected with the mounting support 2. After the sliding block 25 of the first upright 22 is inserted into the sliding groove 21, a screw is installed on the installation support 2 and is in threaded connection with the sliding block 25 of the first upright 22 to fix the first upright 22. The second upright column 23 can freely slide along the axial direction of the sliding groove 21 through the sliding block 25 connected with the second upright column, and when the distance between the adjacent first upright column 22 and the second upright column 23 is fixed, a screw can be installed on the mounting support 2 and is in threaded connection with the sliding block 25 of the second upright column 23 to fix the second upright column 23.
Referring to fig. 3, a mounting groove 24 is formed in a side wall of the adjacent first upright column 22 opposite to the second upright column 23, one side of the mounting groove 24 away from the working surface is arranged in a penetrating manner, and one side of the mounting groove 24 facing to two ends of the mounting support 2 in the height direction is also arranged in a penetrating manner. By taking any one guide rod as a reference, the first upright post 22 and the second upright post 23 which are closest to the guide rod form an assembly station, after the lower cover plate 11 is placed, four corners of the lower cover plate 11 are positioned in four mounting grooves 24 of the assembly station, and an assembly area of the core body 1 of an assembly prototype is formed among the four mounting grooves 24 on the assembly station.
Referring to fig. 1 and 3, since a heat exchanger has a plurality of stacked heat medium interlayers and cold medium interlayers, a worker can assemble the prototype core 1 in the assembly area with the side where the guide rod is located as the working side. After the lower cover plate 11 is placed in the assembly area, the first layer of partition 13 is placed, two long seals 15 are placed above the first layer of partition 13, the fins 14 are placed between the long seals 15, and then the second layer of partition 13 is superimposed to form a first layer of thermal medium interlayer.
And then, overlapping a first layer of cold medium interlayer on the first layer of hot medium interlayer, and including the following steps of placing two short seals 16 above the second layer of partition plate 13, placing a second layer of fins 14 between the two short seals 16, and overlapping a third layer of partition plate 13 above the second layer of fins 14 to form a first layer of cold medium layer. Then, the other layers of the hot medium interlayer and the cold medium interlayer are sequentially superposed and assembled according to the method, and when the last layer of the cold medium interlayer is stacked, the upper cover plate 12 can be placed to form the rudiment core body 1. The number of stacked layers of part of heat exchangers is less, can superpose the core 1 of several rudiments on an equipment station, separates through the stainless steel sheet between the core 1 of adjacent rudiment, and the condition that two heat exchangers are sticky when reducing to braze takes place.
Referring to fig. 4, S3, shaping: after assembly, the core bodies 1 of the preforms at the same assembly station are lifted off the assembly device and mounted in a fixing device 6 in the shaping zone. The fixing device 6 is composed of a lower pressing plate 61, an upper pressing plate 62 positioned above the lower pressing plate 61 and connecting bolts 63 positioned at four corners of the lower pressing plate 61, and the prototype core 1 is positioned between the upper pressing plate 62 and the lower pressing plate 61. One end of the connecting bolt 63 facing the upper press plate 62 penetrates the upper press plate 62 and is threadedly connected with a lock nut 64. By screwing the lock nut 64 toward the lower platen 61, the distance between the lower platen 61 and the upper platen 62 can be shortened, and the core 1 of the prototype can be compressed, thereby reducing the occurrence of collapse of the core 1 of the prototype when the core 1 of the prototype is shaped.
After the locking nut 64 is screwed for the first time, the distance between the upper pressure plate 62 and the lower pressure plate 61 needs to be measured by a tape measure, data of at least four directions needs to be measured, and the position of the locking nut 64 on the connecting screw needs to be finely adjusted until the distances between the upper pressure plate 62 and the lower pressure plate 61 measured in the four directions are equal. The upper press plate 62 is typically cast iron weighing 20-40 kg, and in this embodiment 20 kg of cast iron is used for the upper press plate 62.
After the core body 1 of the prototype is fixed, the levelness and the verticality of the core body 1 of the prototype are measured by using an angle square, and then aluminum blocks are used for slapping from two ends of the width direction of the core body 1 of the prototype towards the side walls of the core body 1 of the prototype at the same time until the wall surfaces of the two side walls are slapped, and then the side walls of the core body 1 of the prototype in the length direction are slapped. And observing all side walls of the prototype core 1, hooking the sunken parts of the fins 14 by using a screwdriver, and knocking screws by using aluminum blocks until the sunken parts of the fins 14 and the wall surface of the prototype core 1 are positioned on the same horizontal plane.
S4, forming a heat exchanger: and (3) feeding the core body 1 of the molded prototype into a brazing furnace for brazing, then feeding the brazed core body 1 into an argon welding processing area, and welding the left end socket 17 and the right end socket 18 with the core body 1, so that a heat medium channel is formed by the heat medium interlayer, the left end socket 17 and the right end socket 18.
S5, test sealing: the heat medium outlet 181 is blocked by a plug, the heat medium inlet 171 of the heat exchanger is connected with an air pipe, then the heat exchanger is placed in a water pool of a test area, 0.11-0.16MPa of compressed gas is introduced into the heat medium inlet 171, whether bubbles are generated in the water pool is observed, and the compressed gas of 0.15MPa is introduced in the embodiment to carry out a pressure test. If no bubble exists, the test is passed. If the air bubbles exist, the welding leakage occurs at the position where the air bubbles are generated, and the repair welding is needed until the tightness test is qualified.
Referring to fig. 2, S6, heat exchanger leak repairing: and (3) adopting leakage repairing glue to repair leakage at the position of the leakage welding point generated by the heat exchanger, then heating the heat exchanger coated with the leakage repairing glue until the sealant is solidified, and carrying out test sealing treatment on the heat exchanger subjected to leakage repairing again. The method specifically comprises the following steps:
a: cleaning welding spot leakage: and draining water in the heat exchanger, and blowing water and impurities around the welding spot of the heat exchanger by compressed air.
B: and (3) leakage repairing: firstly, the heat exchanger is pushed into a drying oven to be preheated for 18-25min at 70-90 ℃, so that the leakage-repairing glue can be quickly cured. The drying oven can be an electrothermal blowing constant-temperature drying oven, and after the drying oven is heated to 80 ℃ within 20 minutes and kept at the constant temperature for 5 minutes, the drying oven is closed, and the heat exchanger is taken out.
The leakage repairing glue adopts PSI quick repairing glue and welding seam sealant, firstly, the PSI quick repairing glue is used for coating the hole bottom of the leakage welding spot, and after the PSI quick repairing glue is solidified, the hole bottom of the leakage welding spot is blocked and forms a closed cavity with the hole wall of the leakage welding spot; then, filling the welding seam sealant into the injection gun 4 and injecting the welding seam sealant into the welding leakage point, and stopping injecting the sealant when the sealant liquid glue of the welding seam flows out; and finally, using PSI quick repair glue to seal the orifice of the welding leakage point.
Referring to fig. 5 and 6, the injection gun 4 includes an injection needle 41, a glue container 42, a connecting tube 43 and a squeeze column 44, which are sequentially arranged from bottom to top, the injection needle 41 is hollow, an injection hole 411 is opened on a peripheral wall of the injection needle 41 facing to a needle point, and one side of the injection needle 41 away from the needle point is inserted into the glue container 42. The peripheral wall of one end of the injection needle 41 facing the glue container 42 is connected with a first magnetic ring 471, and the peripheral wall of one end of the injection needle 41 close to the needle point is connected with a limiting block. A transparent bowl-shaped cover 47 is slidably connected to the circumferential wall of the injection needle 41, the bowl-shaped cover 47 is located between the limiting block and the first magnetic ring 471, a second magnetic ring is connected to one side of the bowl-shaped cover 47 facing the first magnetic ring 471, and the first magnetic ring 471 and the second magnetic ring are magnetically attracted. One side of the bowl-shaped cover 47 facing the first magnetic ring 471 is connected with a second magnetic ring, and the first magnetic ring 471 and the second magnetic ring are magnetically attracted.
The glue containing cylinder 42 is far away from the opening at one end of the injection needle 41 and is communicated with the connecting cylinder 43, an external thread is arranged on the circumferential wall of one end of the glue containing cylinder 42 facing the connecting cylinder 43, an internal thread is arranged on the inner wall of the connecting cylinder 43, and after the welding seam sealant is poured into the glue containing cylinder 42, the glue containing cylinder 42 is in threaded connection with the connecting cylinder 43. The outer wall of the glue containing cylinder 42 is connected with a refrigerating plate 45, and the refrigerating plate 45 is hollow and is provided with an air outlet 451 at the side wall of one end facing the connecting cylinder 43.
Referring to fig. 5 and 6, a handheld column 46 is connected to the peripheral wall of the refrigerating plate 45, an object placing opening 461 is formed in the handheld column 46, and the handheld column 46 is hollow and is communicated with the object placing opening 461 and the refrigerating plate 45 respectively. Dry ice is poured into the handheld column 46 and the refrigerating plate 45 through the storage opening 461 for refrigerating the welding seam sealant poured into the rubber containing barrel 42. The storage opening 461 is connected with a sealing cover 462 for sealing the storage opening 461, and carbon dioxide formed by sublimed dry ice is discharged from the air outlet. The peripheral wall of the handheld column 46 is connected with a heat preservation layer 463, and the heat preservation layer 463 is made of heat preservation cotton.
The extrusion column 44 is inserted into the connecting cylinder 43 from one side of the connecting cylinder 43 far away from the glue containing cylinder 42 and is pushed towards the bottom of the glue containing cylinder 42, and the outer wall of the extrusion column 44 is attached to the inner wall of the glue containing cylinder 42. As the receiving space in the cartridge 42 becomes smaller, the weld sealant is squeezed into the injection needle 41 and injected into the hole at the welding point through the injection hole 411. The bowl-shaped cover 47 is pulled to cover the orifice of the welding leakage point, so that the overflow of the welding seam sealant is reduced. When the welding spot is larger than the coverage of the bowl-shaped cover 47, or the welding spot is too small and is only within 20mm larger than the diameter of the injection needle 41, the bowl-shaped cover 47 is not needed, and at this time, the bowl-shaped cover 47 can slide upwards towards the glue barrel 42 and is fixed by the magnetic attraction of the first magnetic ring 471 and the second magnetic ring.
And after the welding seam sealant is filled, when the welding seam sealant is to be initially set, coating a layer of PSI quick repair sealant on the orifice of the welding leakage point and scraping.
C: accelerating solidification: and (3) placing the heat exchanger subjected to leakage repairing glue leakage repairing into a drying box for heating for 40-50min at the temperature of 170-180 ℃, and accelerating the solidification of the leakage repairing glue. In the embodiment, the heating time is 40min, and the constant temperature is kept at 180 ℃ for drying and curing the leakage repairing glue.
S7, polishing and painting: and (3) sending the heat exchanger qualified in the test into a packaging area for polishing, wherein polishing mainly comprises polishing the welding line on the heat exchanger smoothly. And finally, performing surface painting and packaging treatment.
The implementation principle of the heat exchanger production process convenient for leakage repair is as follows: and processing the raw material of the heat exchanger in the processing area, and feeding the processed material into the assembly area for assembly. One assembling device is provided with two assembling stations, and workers on the two assembling stations carry out assembling work face to face. After the distance between the mounting brackets 2 and the distance between the first column 22 and the second column 23 are adjusted, the core 1 of the prototype starts to be assembled.
After the prototype core 1 is assembled in the height direction of the first upright column 22, a hoisting rope passes through the lowermost lower cover plate 11 and fixes the prototype core 1, then the prototype core 1 is hoisted to the lower pressing plate 61 with the connecting bolts 63 assembled, then the upper pressing plate 62 is hoisted to the upper side of the prototype core 1, the connecting bolts 63 are inserted into holes pre-opened on the upper pressing plate 62 during hoisting, and then the fastening bolts are screwed. And continuously measuring the distance between the upper pressure plate 62 and the lower pressure plate 61 and finely adjusting the locking bolt until the distances between the upper pressure plate 62 and the lower pressure plate 61 measured in the four directions are equal. Next, the core 1 of the prototype is adjusted in the shaping area, and the shaped core 1 of the prototype is sent to the brazing furnace by the forklift to be brazed.
Then the formed core body 1 is sent into an argon welding area to argon weld a left end socket 17 and a right end socket 18, and then the formed heat exchanger is placed into a water pool to carry out a tightness test. And (5) sending the heat exchanger which is qualified in sealing into a packaging area for polishing, air injection and packaging. And injecting leakage repairing glue into the leakage welding points through the injection gun 4 when the sealing is unqualified, and solidifying the leakage repairing glue through the drying box to finish the leakage repairing of the leakage welding points. The heat exchanger subjected to leakage repairing is sent into a packaging area for treatment after a sealing test.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. A heat exchanger production process convenient for leakage repair is characterized in that: the method comprises the following steps:
processing accessories: processing a plate into a lower cover plate (11), an upper cover plate (12), a partition plate (13), fins (14), a long seal (15), a short seal (16), a left seal head (17) and a right seal head (18) which meet the design requirements;
core (1) of assembly prototype: firstly, a lower cover plate (11) is placed in an assembly device, then a partition plate (13), a fin (14) and a long seal (15) are assembled into a heat medium interlayer and stacked above the lower cover plate (11), then the partition plate (13), the fin (14) and a short seal (16) are assembled into a cold medium interlayer above the heat medium interlayer, and then the heat medium interlayer and the cold medium interlayer are sequentially overlapped and assembled according to the method until the number of layers is specified, and then an upper cover plate (12) can be placed to form a prototype core body (1);
forming a heat exchanger: feeding the rudiment core body (1) into a brazing furnace for brazing; then, the core body (1) after brazing is sent to an argon welding processing area, and the left end socket (17) and the right end socket (18) are welded with the core body (1), so that a heat medium channel is formed by the heat medium interlayer, the left end socket (17) and the right end socket (18);
test of sealing property: the heat medium outlet (181) is blocked by a plug, the heat medium inlet (171) of the heat exchanger is connected with an air pipe, then the heat exchanger is placed in a water pool, 0.11-0.16MPa of compressed gas is introduced into the heat medium inlet (171), and whether bubbles are generated in the water pool or not is observed;
if no bubble exists, the test is qualified, and the step of polishing and painting is carried out; if bubbles continuously appear at local parts, the test is unqualified, the heat exchanger has welding spot leakage, and the step of heat exchanger leakage repairing is carried out;
leak repairing of a heat exchanger: adopting leakage repairing glue to repair leakage at the position of a leakage welding point generated by the heat exchanger, then heating the heat exchanger coated with the leakage repairing glue until the sealant is solidified, and carrying out test sealing treatment on the heat exchanger subjected to leakage repairing again;
the heat exchanger leakage repairing step comprises the following steps:
a: cleaning welding spot leakage: draining water in the heat exchanger, and blowing water and impurities around the welding spot of the heat exchanger by compressed air;
b: and (3) leakage repairing: the leakage repairing glue adopts PSI quick repairing glue and welding seam sealant, firstly, the PSI quick repairing glue is used for coating the hole bottom of the leakage welding spot, and after the PSI quick repairing glue is solidified, the hole bottom of the leakage welding spot is blocked and forms a closed cavity with the hole wall of the leakage welding spot; then injecting the welding seam sealant into the welding leakage point, and stopping injecting the sealant when the sealant liquid glue of the welding seam flows outwards; finally, the PSI quick repair glue is used for plugging the orifices of the welding leakage points;
c: accelerating solidification: placing the heat exchanger subjected to leakage repairing glue leakage repairing into a drying box for heating for 40-50min at the temperature of 170-;
in the leakage repairing step, the welding seam sealant is contained in an injection gun (4), the injection gun (4) comprises an injection needle (41), a glue containing barrel (42), a connecting barrel (43) detachably connected with the glue containing barrel (42) and an extrusion column (44) inserted into the connecting barrel (43), the injection needle (41) is hollow, an injection hole (411) is formed in the peripheral wall of the injection needle facing the needle point, and one side, far away from the needle point, of the injection needle (41) is inserted into the glue containing barrel (42); the glue containing barrel (42) is arranged at an opening at one end far away from the injection needle (41) and is communicated with the connecting barrel (43); the extrusion column (44) is pushed towards the bottom of the glue containing barrel (42) from one side, far away from the glue containing barrel (42), of the connecting barrel (43), and the outer wall of the extrusion column (44) is attached to the inner wall of the glue containing barrel (42);
the outer wall of the rubber containing barrel (42) is connected with a refrigerating plate (45), the refrigerating plate (45) is hollow and is filled with dry ice, and an air outlet hole (451) is formed in the side wall of one end, facing the connecting barrel (43), of the refrigerating plate (45);
polishing and paint spraying: and (4) sending the heat exchanger qualified in the test into a packaging area for polishing, spraying paint and packaging.
2. The heat exchanger production process convenient for leakage repair according to claim 1, wherein: before the leakage repairing step, the heat exchanger is pushed into a drying box for preheating for 18-25min, and the preheating temperature is 70-90 ℃.
3. The heat exchanger production process convenient for leakage repair according to claim 1, wherein: the peripheral wall of the refrigerating plate (45) is connected with a handheld column (46), an object placing opening (461) is formed in the handheld column (46), and the handheld column (46) is hollow and is respectively communicated with the object placing opening (461) and the refrigerating plate (45); the storage opening (461) is connected with a sealing cover (462).
4. The heat exchanger production process convenient for leakage repair according to claim 3, wherein: the heat preservation layer (463) is sleeved on the peripheral wall of the handheld column (46).
5. The heat exchanger production process convenient for leakage repair according to claim 4, wherein: the periphery wall of the injection needle (41) is connected with a transparent bowl-shaped cover (47) in a sliding mode, and the bowl-shaped cover (47) can be covered on the hole of the welding leakage point.
6. The heat exchanger production process convenient for leakage repair according to claim 5, wherein: the injection needle (41) is connected with a first magnetic ring (471) towards the peripheral wall of one end of the rubber containing cylinder (42), one side of the bowl-shaped cover (47) towards the first magnetic ring (471) is connected with a second magnetic ring, and the first magnetic ring (471) and the second magnetic ring are arranged in a magnetic attraction mode.
7. The heat exchanger production process convenient for leakage repair according to claim 6, wherein: the peripheral wall of one end, close to the needle point, of the injection needle (41) is connected with a limiting block, and the second magnetic ring is located between the limiting block and the first magnetic ring (471).
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