CN110864581A - Preparation process of fin for efficient heat exchanger - Google Patents
Preparation process of fin for efficient heat exchanger Download PDFInfo
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- CN110864581A CN110864581A CN201910984981.0A CN201910984981A CN110864581A CN 110864581 A CN110864581 A CN 110864581A CN 201910984981 A CN201910984981 A CN 201910984981A CN 110864581 A CN110864581 A CN 110864581A
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- fin
- copper pipe
- pipe base
- heat exchanger
- spraying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/40—Metallic substrate based on other transition elements
- B05D2202/45—Metallic substrate based on other transition elements based on Cu
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses a preparation process of a fin for a high-efficiency heat exchanger, belongs to the technical field of fin preparation, and discloses a preparation process of a fin for a high-efficiency heat exchanger, the plurality of fin blocks are distributed on the copper pipe base in an inclined annular shape at equal intervals, so that the heat dissipation area is enlarged to the maximum extent in a limited space, meanwhile, a certain gap is left between two adjacent fin blocks, which is beneficial to the conduction of heat along with air, the copper pipe base and the fin block are coated with the anti-corrosion coating, which is beneficial to improving the anti-corrosion performance of the fin and the application range of the fin, the anticorrosive coating adopts multiple covering type spraying, the adhesive force of the coating is further effectively improved, and simultaneously after the spraying, detecting the film layer of the sprayed sample plate, detecting whether the adhesive force and the mechanical strength of the anticorrosive coating reach the standard or not, and the detection result is combined with the actual preparation process for analysis so as to prepare the fin with the best quality for the high-efficiency heat exchanger.
Description
Technical Field
The invention relates to the technical field of fin preparation, in particular to a preparation process of a fin for a high-efficiency heat exchanger.
Background
The heat exchanger is a device for transferring partial heat of hot fluid to cold fluid, and is a layer of good heat-conducting medium attached to a heating device. At present, the heat exchanger plays an important role in chemical industry, petroleum industry, power industry, food industry and other industrial production, can be used as a heater, a cooler, a condenser, an evaporator, a reboiler and the like in chemical industry production, and is widely applied.
The heat exchange fins are important components of the heat exchanger, and are usually arranged on the surface of a heat exchange tube to increase the external surface area or the internal surface area of the heat exchange tube, so that the purpose of improving the heat exchange efficiency is achieved. The heat dissipation efficiency of the existing heat exchange fin still needs to be further improved, and meanwhile, aiming at severe environments such as high alkali, high salt and high acid, or the use temperature of the heat exchange fin is 150-300 ℃, the flue gas in the environments similar to the severe environments contains SO2 and a small amount of gases such as CO2, SO3 and HCl, and because the flue gas contains water, strong corrosive solutions such as H2SO4 and HCl can be formed instantly, SO the corrosion resistance of the heat exchange fin is particularly important.
And current radiating fin is in order to improve its corrosion resisting property, mostly is at the one deck anticorrosive coating of surface spraying, often also can not detect just putting into use to the quality of this coating after the spraying anticorrosive coating, and in long-term use, some unqualified coatings still drop very easily, and the time of effect is short, often is difficult to reach the high efficiency of fin heat transfer for the heat exchanger.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a process for preparing a fin for a high-efficiency heat exchanger, the plurality of fin blocks are distributed on the copper pipe base in an inclined annular shape at equal intervals, so that the heat dissipation area is enlarged to the maximum extent in a limited space, meanwhile, a certain gap is left between two adjacent fin blocks, which is beneficial to the heat dissipation and conduction along with the air, the copper pipe base and the fin block are coated with the anti-corrosion coating, which is beneficial to improving the anti-corrosion performance of the fin and the application range of the fin, the anticorrosive coating adopts multiple covering type spraying, the adhesive force of the coating is further effectively improved, and simultaneously after the spraying, detecting the film layer of the sprayed sample plate, detecting whether the adhesive force and the mechanical strength of the anticorrosive coating reach the standard or not, the detection result is combined with the actual preparation process to prepare the fin with the best quality for the high-efficiency heat exchanger.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A preparation process of a fin for a high-efficiency heat exchanger comprises the following steps:
s1, preparation of raw materials: the copper alloy and the aluminum alloy sheet are used as base materials for fin preparation, and the base materials are cleaned by clear water and dried for later use;
s2, casting preparation: preparing the prepared copper alloy in the S1 into a hollow annular copper pipe base, stamping an aluminum alloy sheet through a die-casting die to obtain a fin block, and equally cutting a plurality of connecting cavities for connecting the fin block on the outer side wall of the copper pipe base along the annular direction;
s3, surface treatment: performing sand blasting or shot blasting treatment on the surfaces of the copper pipe base and the fin block prepared in the step S2, removing stains, residual rust and the like on the surfaces of the copper pipe base and the fin block, cleaning the copper pipe base and the fin block by clear water and drying the copper pipe base and the fin block;
s4, surface anticorrosion spraying: spraying anticorrosive paint on the outer surfaces of the copper pipe base and the fin block treated in the step S3, spraying anticorrosive paint for the first time, wherein the thickness of the paint is 20-40 mu m, standing for 0.7-1h, spraying anticorrosive paint for the second time, wherein the thickness of the paint is 20-40 mu m, and standing for 0.7-1h, and repeating the operation for 3-4 times in sequence to reach the specified film thickness, wherein the film thickness is kept within the range of 130-;
s5, detecting the film layer: manufacturing a spraying sample plate, and carrying out film quality detection on the spraying sample plate;
s6, welding and connecting: and welding metal connectors with the same height as the inner ends of the fin blocks on the inner ends of the fin blocks by a welding machine, fixedly welding the fin blocks with the connecting cavities on the copper pipe base by the metal connectors, polishing the welding positions by using polishing paper after welding is finished, and obtaining the fins for the high-efficiency heat exchanger after polishing.
Furthermore, the fin blocks are narrow and wide in width, the fin blocks are designed to be narrow in width and wide in width, the inner ends of narrow parts can be fixedly welded with the copper pipe base, the outer width can improve the mechanical strength of the fins, the metal connecting heads are obliquely and fixedly welded on the side walls of the inner ends of the fin blocks, the fin blocks are obliquely arranged along the annular direction of the copper pipe base, the inner included angle between the fin blocks and the copper pipe base is 20-35 degrees, and the annular oblique arrangement is more beneficial to achieving heat dissipation and conduction of a larger area in a limited space compared with the situation that the fin blocks are directly and vertically welded on the copper pipe base.
Further, adjacent two slope fixedly connected with stiffener between the fin piece, the outside of copper pipe base is equipped with a plurality of strengthening rings along vertical direction cover, and is a plurality of strengthening ring from the top down equidistant fixed welding is on the outer end lateral wall of fin piece, stiffener and strengthening ring are made by aluminium alloy plate, and the cooperation setting of stiffener and strengthening rod not only is favorable to the heat-conduction between two adjacent fin pieces, has still further strengthened the connection steadiness between a plurality of fin pieces, has effectively strengthened the mechanical strength of this fin for the heat exchanger.
Furthermore, in the step S3, the sand blasting or shot blasting process is to use compressed air or high-pressure water flow as power, and sand and steel shots sprayed by a sand blasting machine or a shot blasting machine are used to remove foreign matters on the outer surfaces of the copper pipe base and the fin block.
Furthermore, river sand or quartz sand is adopted as a blasting material by the sand blasting machine, steel shots or metal fragments are adopted as the blasting material by the shot blasting machine, the sand blasting cleanliness reaches Sa2.5 grade or above, and the roughness is controlled within the range of 20-40 mu m.
Further, the preparation method of the anticorrosive paint in S4 comprises the following steps: weighing 30-50 parts of epoxy resin, 20-25 parts of colloidal graphite powder, 10-15 parts of heat-conducting filler, 2-5 parts of antioxidant and 3-6 parts of curing agent according to the mass parts as raw materials of the anticorrosive coating, introducing the epoxy resin, the colloidal graphite powder, the heat-conducting filler and the antioxidant into a reaction kettle, slowly adding the curing agent in the continuous stirring process for 3-4 hours, sieving by using a 150-mesh 180-mesh filter sieve after stirring uniformly without precipitation to obtain the anticorrosive coating, exerting the fireproof and fireproof effects of the graphite powder under the application of the colloidal graphite powder in the epoxy resin, further improving the excellent performance of the anticorrosive coating, and improving the antioxidant effect of the anticorrosive coating by using the antioxidant 168 for the coating and the phenol main antioxidant in a compounding way, the added heat-conducting filler is beneficial to improving the heat-conducting and heat-transferring effects of the anticorrosive coating, so that the heat exchange effect of the fin is effectively improved.
Furthermore, the heat-conducting filler comprises nano alumina, silica powder, fibrous high-heat-conductivity carbon powder and titanium micron, wherein the fibrous high-heat-conductivity carbon powder has extremely high heat conductivity coefficient, the heat conductivity along the fiber direction is 2-3 times that of copper, and the fibrous high-heat-conductivity carbon powder has good mechanical property and excellent heat conduction and radiation heat dissipation capacity, and can be designed with heat conduction orientation, the titanium micron is beneficial to the chemical bonding effect of the heat-conducting filler and an epoxy resin interface, in addition, the titanium has excellent corrosion resistance, so that the corrosion resistance of the fin is further effectively improved, the curing agent comprises one or more of an aliphatic polyamine curing agent and an anhydride curing agent, and the anhydride curing agent and the epoxy resin form ester bonds and have higher resistance to organic acid and inorganic acid.
Furthermore, in the S5, the film layer detection adopts a coating impact device to perform film layer impact detection on the spraying sample plate, the coating impact device comprises an operation table, two sides of the upper end of the operation table are fixedly connected with upright posts, the upper ends of the two upright posts are fixedly connected with a top plate, the middle part of the upper end of the top plate is fixedly provided with a stamping cylinder, the telescopic end of the stamping cylinder penetrates through the top plate and is fixedly connected with a stamping plate, the upper end of the stamping plate is fixedly provided with a rotating motor, the driving end of the rotating motor penetrates through the stamping plate and is fixedly connected with a group of stamping handles, the upper end of the operation table is provided with a workpiece placing cavity corresponding to the stamping handles in position, when detection is performed, the sample plate to be detected is placed in the workpiece placing cavity, the stamping handles impact the coating on the sample plate under the action of the stamping cylinder, and after impact, if the sample plate falls off under the impact of certain pressure, the coating is qualified, the bottom of the workpiece placing cavity is embedded with and provided with a pressure sensor, the top end of the top plate is fixedly provided with a display screen which is electrically connected with the stamping cylinder and the pressure sensor, and the display screen displays the pressure detected by the pressure sensor in real time, so that multiple groups of impacts with different pressures can be carried out, and the damage degree of the stamping force of the sample plate film layer to the maximum extent can be obtained.
Further, equal fixedly connected with guide bar on the both sides lateral wall of roof, two all open on the relative lateral wall of pole setting chisel have with guide bar assorted guide way, two equal fixedly connected with fixed plate on the relative lateral wall that the pole setting is close to the lower extreme, fixedly connected with electric putter on the fixed plate, the bottom of guide way is located the top of fixed plate, and electric putter's flexible end can fix connects the briquetting for it is spacing to place the spraying model of placing the intracavity in the work piece.
Further, fixedly connected with places the mount table that the chamber position corresponds with the work piece on the lateral wall of operation panel rear end, there are multiunit LED light along equidistant fixed mounting of horizontal direction on the lateral wall of mount table, set up multiunit LED light and be favorable to the operator to carry out clearer observation to the model rete.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) this scheme is through with a plurality of fin blocks slope annular equidistant distribution on copper pipe base, realize furthest's expansion heat radiating area in finite space, leave certain clearance between two adjacent fin blocks simultaneously, be favorable to the heat to distribute the conduction along with the air, and coating anticorrosive coating on copper pipe base and fin block, be favorable to improving the corrosion resisting property of this fin, improve its application scope, and anticorrosive coating adopts many times covering formula spraying, further effectively improve the adhesive force of coating, simultaneously after the spraying, carry out the rete to the spraying model of spraying, detect whether adhesive force and the mechanical strength of this anticorrosive coating are up to standard, combine with actual preparation technology through the testing result, with the fin for the high-efficient heat exchanger of preparation best quality.
(2) The surface treatment is carried out on the copper pipe base and the fin block before the spraying of the anticorrosive paint, so that attachments on the outer surfaces of the copper pipe base and the fin block are removed, the improvement of the attachment of the subsequent anticorrosive paint during the spraying is facilitated, and the anticorrosive paint is more easily adhered to the copper pipe base and the fin block.
(3) The heat-conducting filler is added into the anticorrosive coating, and comprises nano aluminum oxide, silica powder, fibrous high-heat-conductivity carbon powder and titanium micron, wherein the fibrous high-heat-conductivity carbon powder has extremely high heat conductivity coefficient, the heat conductivity along the fiber direction is 2-3 times that of copper, and the anticorrosive coating has good mechanical property and excellent heat conduction and radiation heat dissipation capacity, so that the high conductivity of the anticorrosive coating is effectively improved, the titanium micron is favorable for the chemical bonding effect of the heat-conducting filler and an epoxy resin interface, and in addition, the titanium has excellent anticorrosive performance, so that the anticorrosive performance of fins is further effectively improved.
(4) Coating impact device is by the punching press jar, the punching press board, rotating electrical machines and punching press handle are constituteed, when carrying out spraying model coating and detecting, at first can drive the punching press handle of below by the punching press jar and carry out the punching press to the coating, the punching press of the different dynamics of design multiunit, under the assistance of LED light, whether the observation coating surface is damaged, meanwhile, accessible rotating electrical machines drives the punching press handle and rotates, the punching press handle rubs with the coating at rotatory in-process, thereby can detect out the antifriction performance of this coating.
Drawings
FIG. 1 is a principal process flow diagram of the present invention;
FIG. 2 is a top view of a fin of the present invention;
FIG. 3 is a schematic perspective view of the joint between the fin block and the metal connector according to the present invention;
fig. 4 is a perspective view of the coating impact device of the present invention.
The reference numbers in the figures illustrate:
the device comprises a copper pipe base 1, a fin block 2, a metal connector 3, a reinforcing rod 4, a reinforcing ring 5, an operation table 6, a vertical rod 7, a top plate 8, a stamping cylinder 9, a stamping plate 10, a stamping handle 11, a workpiece placing cavity 12, a pressure sensor 13, a display screen 14, a guide rod 15, a guide groove 16, an installation table 17, an LED illuminating lamp 18, a fixing plate 19, an electric push rod 20 and a rotating motor 21.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1, a process for manufacturing a fin for a high efficiency heat exchanger includes the following steps:
s1, preparation of raw materials: the copper alloy and the aluminum alloy sheet are used as base materials for fin preparation, and the base materials are cleaned by clear water and dried for later use;
s2, casting preparation: preparing the prepared copper alloy in the step S1 into a hollow annular copper pipe base 1, punching an aluminum alloy sheet by a die-casting die to obtain a fin block 2, and equally cutting a plurality of connecting cavities for connecting the fin block 2 on the outer side wall of the copper pipe base 1 along the annular direction;
s3, surface treatment: performing sand blasting or shot blasting treatment on the surfaces of the copper pipe base 1 and the fin block 2 prepared in the step S2, removing stains, residual rust and the like on the surfaces of the copper pipe base 1 and the fin block 2, cleaning the copper pipe base 1 and the fin block 2 by clear water, and drying;
s4, surface anticorrosion spraying: spraying anticorrosive paint on the outer surfaces of the copper pipe base 1 and the fin block 2 treated by S3, spraying anticorrosive paint for the 1 st time, wherein the thickness of the paint is 20-40 mu m, standing for 0.7-1h, spraying anticorrosive paint for the 2 nd time, the thickness of the paint is 20-40 mu m, standing for 0.7-1h, repeating the operation for 3-4 times in sequence to reach the specified film thickness, keeping the film thickness within the range of 130-140 mu m, and spraying the anticorrosive paint in a covering mode for multiple times, so that the adhesive force of the paint is further effectively improved;
s5, detecting the film layer: manufacturing a spraying sample plate, and carrying out film quality detection on the spraying sample plate;
s6, welding and connecting: and welding metal connectors 3 with the same height as the inner ends of the fin blocks 2 by a welding machine, fixedly welding the fin blocks 2 with the connecting cavities on the copper pipe base 1 by the metal connectors 3, polishing the welding parts by using polishing paper after welding is finished, and obtaining the fins for the high-efficiency heat exchanger after polishing.
Referring to fig. 2-3, the fin block 2 is narrow inside and wide outside, the fin block 2 is designed to be narrow inside and wide outside to facilitate the fixed welding of the inner end of the narrow part with the copper tube base 1, while the outer width is to facilitate the improvement of the mechanical strength of the fin, the metal connector 3 is fixedly welded on the side wall of the inner end of the fin block 2 in an inclined manner, the fin block 2 is arranged in an inclined manner along the annular direction of the copper tube base 1, the inner included angle between the fin block 2 and the copper tube base 1 is 20-35 °, and compared with the case that the fin block 2 is directly and vertically welded on the copper tube base 1, the annular inclined manner is more beneficial to the realization of heat dissipation and conduction of a larger area in a limited space, and what is needed is supplemented here, the copper tube base 1 can be.
Simultaneously, slope fixedly connected with stiffener 4 between two adjacent fin pieces 2, the outside of copper pipe base 1 is equipped with a plurality of strengthening rings 5 along vertical direction cover, a plurality of strengthening rings 5 from the top down equidistant fixed welding is on the outer end lateral wall of fin piece 2, stiffener 4 and strengthening ring 5 are made by aluminium alloy plate, stiffener 4 sets up not only to be favorable to the heat-conduction between two adjacent fin pieces 2 with the cooperation of strengthening ring 5, still further strengthened the connection steadiness between a plurality of fin pieces 2, the mechanical strength of this fin for the heat exchanger has effectively been strengthened.
It should be added that in the step S3, the sand blasting or shot blasting process uses compressed air or high-pressure water flow as power, sand and steel shot sprayed by a sand blasting machine or a shot blasting machine are used to remove foreign matters on the outer surfaces of the copper tube base 1 and the fin block 2, the sand blasting machine uses river sand or quartz sand as a blasting material, the shot blasting machine uses steel shot or metal fragment as a blasting material, the sand blasting cleanliness reaches level sa2.5 or above, the roughness is controlled within the range of 20-40 μm, and attachments on the outer surfaces of the copper tube base 1 and the fin block 2 are removed, so that the adhesion force of the subsequent anticorrosive coating during spraying is improved, and the anticorrosive coating is more easily adhered to the copper tube base 1 and the fin block 2.
In addition, the preparation method of the anticorrosive paint in S4 comprises the following steps: weighing 30-50 parts of epoxy resin, 20-25 parts of colloidal graphite powder, 10-15 parts of heat-conducting filler, 2-5 parts of antioxidant and 3-6 parts of curing agent according to the mass parts as raw materials of the anticorrosive coating, introducing the epoxy resin, the colloidal graphite powder, the heat-conducting filler and the antioxidant into a reaction kettle, slowly adding the curing agent in the continuous stirring process for 3-4 hours, sieving by using a 150-mesh 180-mesh filter sieve after uniform stirring and no precipitation to obtain the anticorrosive coating, playing the fireproof and fireproof roles of the graphite powder under the matching application of the colloidal graphite powder in the epoxy resin, further improving the excellent performance of the anticorrosive coating, and improving the antioxidant effect of the anticorrosive coating by adopting the antioxidant 168 for the coating and the main antioxidant of phenols, the added heat-conducting filler is beneficial to improving the heat-conducting and heat-transferring effects of the anticorrosive coating, so that the heat exchange effect of the fin is effectively improved.
Furthermore, the heat-conducting filler comprises nano aluminum oxide, silicon powder, fibrous high-heat-conductivity carbon powder and titanium micron, wherein the fibrous high-heat-conductivity carbon powder has extremely high heat conductivity coefficient, the heat conductivity along the fiber direction is 2-3 times that of copper, and the fibrous high-heat-conductivity carbon powder has good mechanical property and excellent heat conduction and radiation heat dissipation capacity, and can be designed with heat conduction orientation, so that the high conductivity of the anticorrosive coating is effectively improved, the titanium micron is beneficial to the chemical bonding effect of the heat-conducting filler and an epoxy resin interface, in addition, the titanium has excellent anticorrosive performance, so that the anticorrosive performance of the fin is further effectively improved, the curing agent comprises one or more of an aliphatic polyamine curing agent and an anhydride curing agent, the anhydride curing agent and the epoxy resin form ester bonds, and the acid anhydride curing agent has higher resistance to organic acid and inorganic acid.
Referring to fig. 4, in S5, the film layer detection adopts a coating impact device to perform film layer impact detection on a spraying sample plate, the coating impact device impacts the coating surface of the spraying sample plate to detect the mechanical strength and the anti-dropping property of the coating, the coating impact device comprises an operation table 6, two sides of the upper end of the operation table 6 are fixedly connected with upright posts 7, the upper ends of the two upright posts 7 are fixedly connected with a top plate 8, the middle part of the upper end of the top plate 8 is fixedly provided with a stamping cylinder 9, the telescopic end of the stamping cylinder 9 penetrates through the top plate 8 and is fixedly connected with a stamping plate 10, the upper end of the stamping plate 10 is fixedly provided with a rotating motor 21, the driving end of the rotating motor 21 penetrates through the stamping plate 10 and is fixedly connected with a group of stamping handles 11, the upper end of the operation table 6 is provided with a workpiece placing cavity 12 corresponding to the position of the stamping handles 11, when the, the punching handle 11 impacts the coating on the spraying sample plate under the action of the punching cylinder 9, after impact, whether the coating has a shedding phenomenon is observed, if the coating does not shed under the impact of certain pressure, the coating is qualified, meanwhile, the top end of the punching handle 11 is provided with the rotating motor 21, when the bottom end of the punching handle 11 pushes down and abuts against the coating of the spraying sample plate, the rotating motor 21 is started, the rotating motor 21 drives the punching handle 11 at the lower end to rotate, the punching handle 11 rubs with the coating in the rotating process, so that the anti-friction performance of the coating can be detected, the bottom in the workpiece placing cavity 12 is embedded with the pressure sensor 13, the top end of the top plate 8 is fixedly provided with the display screen 14 which is electrically connected with the punching cylinder 9 and the pressure sensor 13, the display screen 14 displays the pressure detected by the pressure sensor 13 in real time, so that a plurality of groups of impacts with different pressures can be carried out, so as to obtain the maximum damage degree of the punching force borne by the coating of the spraying sample plate, and a person skilled in the art can determine the optimal spraying times and the spraying thickness of the coating by detecting and analyzing data results for multiple times, thereby achieving the optimal spraying effect of the anticorrosive coating.
Equal fixedly connected with guide bar 15 on the both sides lateral wall of roof 10, all open on the relative lateral wall of two pole settings 7 chisel have with guide bar 15 assorted guide way 16, two pole settings 7 are close to equal fixedly connected with fixed plate 19 on the relative lateral wall of lower extreme, fixedly connected with electric putter 20 on the fixed plate 19, the bottom of guide way 16 is located the top of fixed plate 19, electric putter 20's flexible end fixed connection connects the briquetting, be used for placing the spraying model of placing the intracavity 12 in the work piece and carry out spacingly, prevent that the spraying model from appearing the skew carrying out the inspection in-process.
In addition, fixedly connected with places the mount table 17 that the chamber 12 position corresponds with the work piece on the lateral wall of operation panel 6 rear end, and along equidistant fixed mounting in horizontal direction has multiunit LED light 18 on the lateral wall of mount table 17, sets up multiunit LED light 18 and is favorable to the operator to carry out clearer observation to the rete in the spraying model testing process.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (10)
1. A preparation process of a fin for a high-efficiency heat exchanger is characterized by comprising the following steps: the method comprises the following steps:
s1, preparation of raw materials: the copper alloy and the aluminum alloy sheet are used as base materials for fin preparation, and the base materials are cleaned by clear water and dried for later use;
s2, casting preparation: preparing the prepared copper alloy in the S1 into a hollow annular copper pipe base (1), punching an aluminum alloy sheet through a die-casting die to obtain a fin block (2), and cutting a plurality of connecting cavities for connecting the fin block (2) on the outer side wall of the copper pipe base (1) at equal intervals along the annular direction;
s3, surface treatment: performing sand blasting or shot blasting treatment on the surfaces of the copper pipe base (1) and the fin block (2) prepared in the step S2, removing stains, residual rust and the like on the surfaces of the copper pipe base (1) and the fin block (2), cleaning the copper pipe base (1) and the fin block (2) by using clear water, and drying;
s4, surface anticorrosion spraying: spraying anticorrosive paint on the outer surfaces of the copper pipe base (1) and the fin block (2) treated by S3, spraying anticorrosive paint for the 1 st time, wherein the thickness of the paint is 20-40 mu m, standing for 0.7-1h, spraying anticorrosive paint for the 2 nd time, the thickness of the paint is 20-40 mu m, standing for 0.7-1h, and repeating the operation for 3-4 times in sequence to reach the specified film thickness, wherein the film thickness is kept within the range of 130-;
s5, detecting the film layer: manufacturing a spraying sample plate, and carrying out film quality detection on the spraying sample plate;
s6, welding and connecting: the inner ends of the fin blocks (2) are welded with metal connectors (3) with the same height as the fin blocks through welding machines, the fin blocks (2) are fixedly welded with connecting cavities on the copper pipe base (1) through the metal connectors (3), polishing and grinding are carried out on the welding positions through polishing paper after welding is finished, and the fins for the high-efficiency heat exchanger are obtained after polishing.
2. The preparation process of the fin for the high-efficiency heat exchanger, according to claim 1, is characterized in that: the fin block (2) is narrow in inner part and wide in outer part, the metal connectors (3) are obliquely and fixedly welded on the side walls of the inner ends of the fin block (2), the fin block (2) is obliquely arranged along the annular direction of the copper pipe base (1), and the inner included angle between the fin block (2) and the copper pipe base (1) is 20-35 degrees.
3. The preparation process of the fin for the high-efficiency heat exchanger, according to claim 1, is characterized in that: the copper pipe base is characterized in that reinforcing rods (4) are fixedly connected between the adjacent two fin blocks (2) in an inclined mode, a plurality of reinforcing rings (5) are sleeved on the outer side of the copper pipe base (1) along the vertical direction in an equidistant mode from top to bottom and are fixedly welded to the side wall of the outer end of each fin block (2), and the reinforcing rods (4) and the reinforcing rings (5) are made of aluminum alloy sheets.
4. The preparation process of the fin for the high-efficiency heat exchanger, according to claim 1, is characterized in that: in the step S3, the sand blasting or shot blasting treatment is to remove foreign matters on the outer surfaces of the copper pipe base (1) and the fin blocks (2) by using compressed air or high-pressure water flow and the like as power and using sand and steel shots sprayed by a sand blasting machine or a shot blasting machine.
5. The process for preparing the fin for the high-efficiency heat exchanger according to claim 4, wherein the process comprises the following steps: the sand blasting machine adopts river sand or quartz sand as blasting materials, the shot blasting machine adopts steel shots or metal fragments as the blasting materials, the sand blasting cleanliness reaches Sa2.5 grade or above, and the roughness is controlled within the range of 20-40 mu m.
6. The preparation process of the fin for the high-efficiency heat exchanger, according to claim 1, is characterized in that: the preparation method of the anticorrosive paint in S4 comprises the following steps: weighing 30-50 parts of epoxy resin, 20-25 parts of colloidal graphite powder, 10-15 parts of heat-conducting filler, 2-5 parts of antioxidant and 3-6 parts of curing agent according to the mass parts as raw materials of the anticorrosive paint, introducing the epoxy resin, the colloidal graphite powder, the heat-conducting filler and the antioxidant into a reaction kettle, slowly adding the curing agent in the continuous stirring process for 3-4 hours, and sieving by using a 150-mesh 180-mesh filter sieve after uniform stirring and no precipitation to obtain the anticorrosive paint.
7. The process for preparing the fin for the high-efficiency heat exchanger according to claim 6, wherein the process comprises the following steps: the heat-conducting filler comprises nano alumina, silica micropowder, fibrous high heat-conducting carbon powder and titanium micrometer, and the curing agent comprises but is not limited to one or more of aliphatic polyamine curing agent and anhydride curing agent.
8. The preparation process of the fin for the high-efficiency heat exchanger, according to claim 1, is characterized in that: the utility model discloses a coating impact device, including S5 well rete detection, the rete detects and adopts the coating impact device to carry out the impact detection of rete to the spraying model, the coating impact device includes operation panel (6), equal fixedly connected with pole setting (7) in the upper end both sides of operation panel (6), two the upper end fixedly connected with roof (8) of pole setting (7), the upper end middle part fixed mounting of roof (8) has punching press jar (9), the flexible end of punching press jar (9) runs through roof (8) and fixedly connected with punching press board (10), the equal fixed mounting in upper end of punching press board (10) has rotating electrical machines (21), the drive end of rotating electrical machines (21) runs through punching press board (10) and fixedly connected with a set of punching press handle (11), the upper end of operation panel (6) is seted up the work piece that corresponds with punching press handle (11) position and is placed chamber (12), the work piece is placed chamber (12) bottom and is, and a display screen (14) electrically connected with the stamping cylinder (9) and the pressure sensor (13) is fixedly mounted at the top end of the top plate (8).
9. The process of claim 8, wherein the process comprises the following steps: equal fixedly connected with guide bar (15), two on the both sides lateral wall of roof (10) all open on the relative lateral wall of pole setting (7) chisel have with guide bar (15) assorted guide way (16), two equal fixedly connected with fixed plate (19) on the relative lateral wall that pole setting (7) are close to the lower extreme, fixedly connected with electric putter (20) on fixed plate (19), the bottom of guide way (16) is located the top of fixed plate (19).
10. The process of claim 9, wherein the process comprises the following steps: fixedly connected with places mount table (17) that chamber (12) position corresponds with the work piece on the lateral wall of operation panel (6) rear end, along equidistant fixed mounting of horizontal direction on the lateral wall of mount table (17) have multiunit LED light (18).
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Cited By (1)
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| CN112944729A (en) * | 2021-02-19 | 2021-06-11 | 山东佐耀智能装备股份有限公司 | Air source heat pump concave pit convex hull enhanced heat exchange evaporator |
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