CN114383437A - Plastic blow-molding heat exchange plate and manufacturing process thereof - Google Patents
Plastic blow-molding heat exchange plate and manufacturing process thereof Download PDFInfo
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- CN114383437A CN114383437A CN202210064719.6A CN202210064719A CN114383437A CN 114383437 A CN114383437 A CN 114383437A CN 202210064719 A CN202210064719 A CN 202210064719A CN 114383437 A CN114383437 A CN 114383437A
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- heat exchange
- exchange plate
- hollow
- plastic
- transfer medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/58—Blowing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
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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
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/12—Elements constructed in the shape of a hollow panel, e.g. with channels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention discloses a heat exchange plate formed by plastic blowing and a manufacturing process, the heat exchange plate comprises a heat exchange plate body, a first heat transfer medium and a second heat transfer medium, the heat exchange plate body comprises an inlet main pipe, an outlet main pipe and a plurality of hollow channels, the inlet main pipe, the outlet main pipe and the hollow channels are connected and isolated in the plane direction through connecting strips, the inlet main pipe is communicated with an inlet of each hollow channel, an outlet of each hollow channel is communicated with the outlet main pipe, a circulation channel of the first heat transfer medium is formed inside the heat exchange plate body, and the second heat transfer medium flows through the outer side surface of the heat exchange plate body; the blow-up forming process of the plastic heat exchange plate comprises the processes of extruding a parison, cutting the parison, closing the mold, blowing, deflating, opening the mold, taking out a product and the like. Through the mode, the plastic blow-molded heat exchange plate and the manufacturing process form a hollow multi-channel plate structure at one time, and the heat exchange plate is resistant to strong acid, strong alkali and other strong corrosion heat transfer media, strong in mechanical strength, good in pressure bearing performance of the heat transfer media, large in heat exchange area, small in heat exchange temperature difference and low in manufacturing cost.
Description
Technical Field
The invention relates to the technical field of solar heat utilization, in particular to a plastic blow molding heat exchange plate and a manufacturing process thereof.
Background
Industrial heat exchangers are used for heat exchange between two heat transfer media, and are classified into plate type, fin type, shell and tube type, and generally adopt metal structures.
For the strong corrosion heat transfer medium, because the metal material generally has poor corrosion resistance, the metal material with strong corrosion resistance is selected to be expensive and has certain service life; the defects of high manufacturing cost, short service life and the like of industrial strong-corrosion heat exchange equipment are brought.
The plastic material has strong corrosion resistance, certain mechanical strength and certain temperature resistance, but the heat conductivity coefficient is poor, certain manufacturing thickness is required for meeting certain mechanical strength, and the complex heat exchange structure forming process is difficult.
Disclosure of Invention
The invention mainly solves the technical problem of providing a plastic blow molding heat exchange plate and a manufacturing process, selects proper plastic to form a hollow multi-channel plate type structure at one time, can resist strong acid, strong alkali and other strong corrosion heat transfer media, has strong mechanical strength and good pressure bearing performance of the heat transfer media, and has the advantages of plate type heat exchange structure, large heat exchange area, small heat exchange temperature difference and low manufacturing cost; the hollow channel is filled with a first heat transfer medium, the outer surface of the heat exchange plate is filled with a second heat transfer medium, the first heat transfer medium and the second heat transfer medium exchange heat through a layer of plastic, and the heat exchanger can be formed through a multi-layer heat exchange mode.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a plastic blow-molded heat exchanger plate comprising: a heat exchange plate body, a first heat transfer medium and a second heat transfer medium,
the heat exchange plate body comprises an inlet main pipe, an outlet main pipe and a plurality of hollow channels, wherein the inlet main pipe, the outlet main pipe and the hollow channels are connected and isolated in the plane direction through connecting strips, the inlet main pipe is communicated with inlets of the hollow channels, the hollow channels are arranged in a serpentine loop mode, outlets of the hollow channels are communicated with the outlet main pipe, a circulation channel of a first heat transfer medium is formed inside the heat exchange plate body, and a second heat transfer medium is supplied to the outer side surface of the heat exchange plate body to circulate.
In a preferred embodiment of the present invention, the inlet manifold communicates with the inlet of each of the plurality of hollow passages through a flow dividing structure, and the outlet of each of the plurality of hollow passages communicates with the outlet manifold through a flow collecting structure.
In a preferred embodiment of the present invention, the hollow cross-section of the hollow passage is circular or elliptical: the diameter of the circular hollow section is 2-20mm, and the wall thickness is 0.3-3.0 mm; the length of the major axis and the minor axis of the oval hollow section is 2-20mm, and the wall thickness is 0.3-3.0 mm.
In a preferred embodiment of the invention, the width of the connecting strip is 1-20mm, and the thickness is 0.3-3.0 mm.
In a preferred embodiment of the present invention, the first heat transfer medium is a hot-side heat transfer medium, the second heat transfer medium is a cold-side heat transfer medium, and the hot-side heat transfer medium and the cold-side heat transfer medium exchange heat through the plate walls at the inner side and the outer side of the heat exchange plate body.
In order to solve the technical problems, the invention adopts a technical scheme that: the manufacturing process of the heat exchange plate formed by plastic blowing comprises the following preparation steps:
s1, preparing a heat exchange plate mold:
the heat exchange plate mold consists of a left mold and a right mold, wherein the shape of an inner cavity formed by closing the two molds is matched with the shape of the heat exchange plate, and the molds are made of alloy aluminum;
s2, extruding the parison: feeding plastic particles into a hopper of a single-screw extruder or a double-screw extruder, extruding a hollow plastic pipe with a certain diameter in a semi-molten state, feeding the hollow plastic pipe into a storage cylinder, preserving heat to prevent cooling deformation, determining the diameter of the extruded hollow plastic pipe according to the circumference of the transverse section of the heat exchange plate, and determining the extrusion thickness according to the pressure bearing requirement of the hollow channel of the heat exchange plate;
s3, cutting the parison: cutting the parison according to the longitudinal length of the heat exchange plate, and quickly descending the storage cylinder with the cut hollow pipe parison to the centers of the two separated half molds;
s4, mold closing: slowly closing the two half molds at a certain speed, and firstly contacting the lower sides of the two half molds to ensure that the air in the hollow part of the hollow channel parison keeps a certain pressure in the closing process, and simultaneously discharging part of the air in the hollow part from the upper part in the final closing stroke to ensure that the walls of the hollow tube pair of the finished heat exchange plate are not bonded with each other;
s5, inflation: after the die assembly is completed, connecting an inflation inlet to an outlet at the upper part of a hollow tube of the heat exchange plate, injecting high-pressure air to blow and expand the heat exchange plate to reach the shape of a die cavity, controlling the inflation pressure between 0.2 and 0.7Mpa and controlling the inflation pressure as high as possible, ensuring that the plastic is attached to the wall of the die, ensuring that the wall thickness of a hollow channel is uniform, and keeping the inflation time between 10 and 45 seconds, wherein the blow molding temperature is-100 and 210 ℃;
s6, cooling: in the process of inflation and pressure maintaining, the heat exchange plate finished product is rapidly radiated through the aluminum mold shell, or forced air convection cooling is carried out on the aluminum mold shell, and the plastic is gradually solidified and shaped in the cooling process;
s7, air bleeding: after the plastic heat exchange plate is solidified and shaped, the high-pressure inflation inlet is removed for deflation;
s8, opening the die and finishing: and after the air release is finished, separating the two half dies, taking out the heat exchange plate blank, and finishing to finish the manufacture of the heat exchange plate finished product.
In a preferred embodiment of the present invention, in step S2, the plastic particles are made of blow molding high density polyethylene, glass fiber modified high density polyethylene, polypropylene, glass fiber modified polypropylene or glass fiber modified thermoplastic polyurethane
In a preferred embodiment of the invention, the working temperature of the heat exchange plate is-100-80 ℃ when the blow molding high-density polyethylene is blown, the working temperature of the heat exchange plate is-100-125 ℃ when the glass fiber modified high-density polyethylene is blown, the working temperature of the heat exchange plate is-30-100 ℃ when the polypropylene is blown, the working temperature of the heat exchange plate is-30-150 ℃ when the glass fiber modified polypropylene is blown, and the working temperature of the heat exchange plate is-40-180 ℃ when the glass fiber modified thermoplastic polyurethane is blown.
The invention has the beneficial effects that: the heat exchange plate formed by plastic blowing and the manufacturing process select proper plastic to form a hollow multi-channel plate type structure at one time, the heat exchange plate is resistant to strong acid, strong alkali and other strong corrosion heat transfer media, the mechanical strength is strong, the pressure bearing performance of the heat transfer media is good, the plate type heat exchange structure is large in heat exchange area, small in heat exchange temperature difference and low in manufacturing cost; the hollow channel is filled with a first heat transfer medium, the outer surface of the heat exchange plate is filled with a second heat transfer medium, the first heat transfer medium and the second heat transfer medium exchange heat through a layer of plastic, and the heat exchanger can be formed through a plurality of layers of heat exchange plates.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural view of a preferred embodiment of a plastic blow-molded heat exchanger plate of the present invention;
FIG. 2 is a schematic cross-sectional view of a preferred embodiment of the inlet tube of the plastic blow-molded plate of the present invention;
the parts in the drawings are numbered as follows: 1. the heat exchange plate comprises an inlet header pipe, a outlet header pipe, a hollow channel, a connecting strip, a heat exchange plate body, a heat transfer medium I, a heat transfer medium II, a heat transfer medium 8, a flow distribution structure, a flow collection structure 9 and a heat exchange plate body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 2, an embodiment of the present invention includes:
example one
A plastic blow-molded heat exchanger panel comprising: the heat exchange plate comprises a heat exchange plate body 5, a first heat transfer medium 6 and a second heat transfer medium 7, wherein a circulation channel of the first heat transfer medium 6 is formed inside the heat exchange plate body 5, and the second heat transfer medium 7 is circulated on the outer side surface of the heat exchange plate body 5.
Specifically, heat transfer plate body 5 includes inlet manifold 1, export manifold 2 and a plurality of hollow passageway 3, inlet manifold 1 and hollow passageway 3's entry intercommunication, and hollow passageway 3 adopts snakelike return circuit mode to arrange, and hollow passageway 3's export and export manifold 2 intercommunication.
Further, the inlet manifold 1 is communicated with the inlet of each hollow channel 3 in the plurality of hollow channels 3 through a flow dividing structure 8, and the outlet of each hollow channel 3 in the plurality of hollow channels 3 is communicated with the outlet manifold 2 through a flow collecting structure 9.
The hollow section of the hollow channel 3 is circular or elliptical, and the section of the hollow channel 3 is circular or elliptical and can bear the working pressure of a higher heat transfer medium.
The diameter of the circular hollow section is 2-20mm, and the wall thickness is 0.3-3.0 mm; the length of the major axis and the minor axis of the oval hollow section is 2-20mm, and the wall thickness is 0.3-3.0 mm.
Preferably, the circular hollow section has a diameter of 8mm and a wall thickness of 1.0 mm; the major and minor axes of the oval hollow cross-section are 10mm and 6mm in length and 1.0mm in wall thickness.
In this embodiment, the inlet manifold 1, the outlet manifold 2, and the hollow channel 3 are connected and isolated in the planar direction by the connecting strip 4. Wherein, the width of the connecting strip 4 is 1-20mm, and the thickness is 0.3-3.0 mm. Preferably, the connecting strips 4 have a width of 5mm and a thickness of 2.0 mm.
The heat transfer medium I6 is a heat transfer medium at the hot side, the heat transfer medium II 7 is a heat transfer medium at the cold side, and the heat transfer medium at the hot side and the heat transfer medium at the cold side exchange heat through the plate walls at the inner side and the outer side of the heat exchange plate body.
The heat exchange working process of the heat exchange plate in the implementation is as follows:
the hot-side heat transfer medium flows into the inlet header pipe 1, is shunted by the shunt structure 8 to enter each hollow channel 3, then is collected by the collecting structure 9, and flows out of the hot-side heat transfer medium 6 through the outlet header pipe 2;
when flowing in the hollow channel, the hot-side heat transfer medium 6 fully exchanges heat with the cold-side heat transfer medium 7 outside the plate through the hollow channel wall, so that the aim of heat exchange between the hot-side heat transfer medium 6 and the cold-side heat transfer medium 7 is fulfilled.
The heat exchange plate is formed into a hollow multi-channel plate type structure by selecting proper plastics at one step, a first heat transfer medium 6 is conveyed through a hollow channel, a second heat transfer medium 7 is conveyed on the outer surface of the plate, the first heat transfer medium 6 and the second heat transfer medium 7 are separated by a layer of plastic for heat exchange, and a heat exchanger can be formed by the multi-layer heat exchange plates, so that the heat exchange plate has a better heat transfer effect.
Example two
A manufacturing process of a plastic blow molding heat exchange plate comprises the following preparation steps:
s1, preparing a heat exchange plate mold:
the heat exchange plate mold consists of a left mold and a right mold, wherein the shape of an inner cavity formed by closing the two molds is matched with the shape of the heat exchange plate, and the molds are made of alloy aluminum.
S2, extruding the parison: feeding the glass fiber modified thermoplastic polyurethane particles into a hopper of a single-screw extruder or a double-screw extruder, extruding a hollow plastic pipe with a certain diameter in a semi-molten state, then feeding the hollow plastic pipe into a storage cylinder, preserving heat to prevent cooling deformation, determining the diameter of the extruded hollow plastic pipe according to the perimeter of the transverse section of the prepared heat exchange plate, and determining the extrusion thickness according to the pressure bearing required by the hollow channel of the prepared heat exchange plate.
S3, cutting the parison: the parison is cut out according to the longitudinal length of the heat exchanger plate to be produced, and the storage cylinder with the cut-out hollow-tube parison is rapidly lowered to the centre of the two separate mould halves.
S4, mold closing: and slowly closing the two half molds at a certain speed, and firstly contacting the lower sides of the two half molds to ensure that the air in the hollow part of the hollow channel parison keeps a certain pressure in the closing process, and simultaneously discharging part of the air in the hollow cavity from the upper part in the final closing stroke to ensure that the walls of the hollow tube pair of the finished heat exchange plate are not bonded with each other.
S5, inflation: after the die assembly is completed, an inflation inlet is connected to an outlet at the upper part of the heat exchange plate hollow tube, high-pressure air is injected to blow the heat exchange plate hollow tube to enable the heat exchange plate hollow tube to reach the shape of a die cavity, the inflation pressure is 0.6Mpa, the high pressure is controlled as far as possible, the blow molding temperature of the glass fiber modified thermoplastic polyurethane particles is 150 ℃, the glass fiber modified thermoplastic polyurethane is ensured to be attached to the wall of the die, the wall thickness of the hollow channel is uniform, and the blowing time is kept at 45 s.
S6, cooling: in the process of inflation and pressure maintaining, the heat exchange plate finished product is rapidly cooled through the aluminum mold shell, or forced air convection cooling is carried out on the aluminum mold shell, and the plastic of the heat exchange plate finished product is gradually solidified and shaped in the cooling process.
S7, air bleeding: and after the plastic heat exchange plate is solidified and shaped, the high-pressure inflation inlet is removed for deflation.
S8, opening the die and finishing: and after the air release is finished, separating the two half dies, taking out the heat exchange plate blank, and finishing to finish the manufacture of the heat exchange plate finished product.
EXAMPLE III
A manufacturing process of a plastic blow molding heat exchange plate comprises the following preparation steps:
s1, preparing a heat exchange plate mold:
the heat exchange plate mold consists of a left mold and a right mold, wherein the shape of an inner cavity formed by closing the two molds is matched with the shape of the heat exchange plate, and the molds are made of alloy aluminum.
S2, extruding the parison: feeding the glass fiber modified polypropylene particles into a hopper of a single-screw extruder or a double-screw extruder, extruding a hollow plastic pipe with a certain diameter in a semi-molten state, then feeding the hollow plastic pipe into a storage cylinder, preserving heat to prevent cooling deformation, determining the diameter of the extruded hollow plastic pipe according to the perimeter of the transverse section of the heat exchange plate, and determining the extrusion thickness according to the pressure bearing requirement of the hollow channel of the heat exchange plate.
S3, cutting the parison: the parison is cut out according to the longitudinal length of the heat exchanger plate to be produced, and the storage cylinder with the cut-out hollow-tube parison is rapidly lowered to the centre of the two separate mould halves.
S4, mold closing: and slowly closing the two half molds at a certain speed, and firstly contacting the lower sides of the two half molds to ensure that the air of the hollow part of the hollow channel parison keeps a certain pressure in the process of closing the molds, and simultaneously discharging the air of the hollow part of the hollow channel from the upper part in the final mold closing stroke to ensure that the walls of the hollow tubes of the finished heat exchange plate are not bonded with each other.
S5, inflation: after the die assembly is completed, an inflation inlet is connected to an outlet at the upper part of the heat exchange plate hollow tube, high-pressure air is injected to blow the heat exchange plate hollow tube to enable the heat exchange plate hollow tube to reach the shape of a die cavity, the inflation pressure is 0.45Mpa, the high pressure is controlled as far as possible, the blow molding temperature of the glass fiber modified polypropylene is 160-200 ℃, the glass fiber modified polypropylene is ensured to be attached to the wall of the die, the wall thickness of the hollow channel is uniform, and the blow-up time is kept at 25 s.
S6, cooling: in the process of inflation and pressure maintaining, the heat exchange plate finished product is rapidly cooled through the aluminum mold shell, or forced air convection cooling is carried out on the aluminum mold shell, and the plastic of the heat exchange plate finished product is gradually solidified and shaped in the cooling process.
S7, air bleeding: and after the plastic heat exchange plate is solidified and shaped, the high-pressure inflation inlet is removed for deflation.
S8, opening the die and finishing: and after the air release is finished, separating the two half dies, taking out the heat exchange plate blank, and finishing to finish the manufacture of the heat exchange plate finished product.
Example four
A manufacturing process of a plastic blow molding heat exchange plate comprises the following preparation steps:
s1, preparing a heat exchange plate mold:
the heat exchange plate mold consists of a left mold and a right mold, wherein the shape of an inner cavity formed by closing the two molds is matched with the shape of the heat exchange plate, and the molds are made of alloy aluminum.
S2, extruding the parison: feeding the glass fiber modified high-density polyethylene particles into a hopper of a single-screw extruder or a double-screw extruder, extruding a hollow plastic pipe with a certain diameter in a semi-molten state, then feeding the hollow plastic pipe into a storage cylinder, preserving heat to prevent cooling deformation, determining the diameter of the extruded hollow plastic pipe according to the perimeter of the transverse section of the prepared heat exchange plate, and determining the extrusion thickness according to the pressure bearing requirement of the hollow channel of the prepared heat exchange plate.
S3, cutting the parison: the parison is cut out according to the longitudinal length of the heat exchanger plate to be produced, and the storage cylinder with the cut-out hollow-tube parison is rapidly lowered to the centre of the two separate mould halves.
S4, mold closing: and slowly closing the two half molds at a certain speed, and firstly contacting the lower sides of the two half molds to ensure that the air in the hollow part of the hollow channel parison keeps a certain pressure in the closing process, and simultaneously discharging part of the air in the hollow cavity from the upper part in the final closing stroke to ensure that the walls of the hollow tube pair of the finished heat exchange plate are not bonded with each other.
S5, inflation: after the die assembly is completed, an inflation inlet is connected to an outlet at the upper part of the heat exchange plate hollow tube, high-pressure air is injected to blow the heat exchange plate hollow tube to enable the heat exchange plate hollow tube to reach the shape of a die cavity, the inflation pressure is 0.6Mpa, the high pressure is controlled as far as possible, the blow molding temperature of the glass fiber modified high-density polyethylene is 160-180 ℃, the glass fiber modified high-density polyethylene is ensured to be attached to the die wall, the wall thickness of the hollow channel is uniform, and the blowing time is kept at 40 s.
S6, cooling: in the process of inflation and pressure maintaining, the heat exchange plate finished product is rapidly cooled through the aluminum mold shell, or forced air convection cooling is carried out on the aluminum mold shell, and the plastic of the heat exchange plate finished product is gradually solidified and shaped in the cooling process.
S7, air bleeding: and after the plastic heat exchange plate is solidified and shaped, the high-pressure inflation inlet is removed for deflation.
S8, opening the die and finishing: and after the air release is finished, separating the two half dies, taking out the heat exchange plate blank, and finishing to finish the manufacture of the heat exchange plate finished product.
EXAMPLE five
A manufacturing process of a plastic blow molding heat exchange plate comprises the following preparation steps:
s1, preparing a heat exchange plate mold:
the heat exchange plate mold consists of a left mold and a right mold, wherein the shape of an inner cavity formed by closing the two molds is matched with the shape of the heat exchange plate, and the molds are made of alloy aluminum.
S2, extruding the parison: feeding the blow molding high-density polyethylene particles into a hopper of a single-screw extruder or a double-screw extruder, extruding a hollow plastic pipe with a certain diameter in a semi-molten state, feeding the hollow plastic pipe into a storage cylinder, preserving heat to prevent cooling deformation, determining the diameter of the extruded hollow plastic pipe according to the perimeter of the transverse section of the heat exchange plate, and determining the extrusion thickness according to the pressure bearing requirement of the hollow channel of the heat exchange plate.
S3, cutting the parison: the parison is cut out according to the longitudinal length of the heat exchanger plate to be produced, and the storage cylinder with the cut-out hollow-tube parison is rapidly lowered to the centre of the two separate mould halves.
S4, mold closing: and slowly closing the two half molds at a certain speed, and firstly contacting the lower sides of the two half molds to ensure that the air in the hollow part of the hollow channel parison keeps a certain pressure in the closing process, and simultaneously discharging part of the air in the hollow cavity from the upper part in the final closing stroke to ensure that the walls of the hollow tube pair of the finished heat exchange plate are not bonded with each other.
S5, inflation: after the die assembly is completed, an inflation inlet is connected to an outlet at the upper part of the heat exchange plate hollow tube, high-pressure air is injected to blow the heat exchange plate hollow tube to enable the heat exchange plate hollow tube to reach the shape of a die cavity, the inflation pressure is 0.7Mpa, the high pressure is controlled as much as possible, the blow molding temperature of blow molding high-density polyethylene is 160-180 ℃, the blow molding high-density polyethylene is ensured to be attached to the wall of the die, the wall thickness of the hollow channel is uniform, and the blow-up time is kept at 45 s.
S6, cooling: in the process of inflation and pressure maintaining, the heat exchange plate finished product is rapidly radiated through the aluminum mold shell, or forced air convection cooling is carried out on the aluminum mold shell, and the plastic is gradually solidified and shaped in the cooling process;
s7, air bleeding: and after the plastic heat exchange plate is solidified and shaped, the high-pressure inflation inlet is removed for deflation.
S8, opening the die and finishing: and after the air release is finished, separating the two half dies, taking out the heat exchange plate blank, and finishing to finish the manufacture of the heat exchange plate finished product.
EXAMPLE six
Another process for manufacturing a plastic blow-molded heat exchange plate comprises the following steps: and prefabricating an up-down symmetrical plate with a half runner by using a prefabricated plastic thin plate through a plastic suction process, and bonding the convex parts of the up-down symmetrical plate through plane hot melting welding to form the heat exchange plate with the hollow channel.
The heat exchange plate formed by blowing plastic and the manufacturing process have the advantages that:
1. selecting proper plastic materials, wherein the heat exchange plate is resistant to strong acid, strong alkali and other strong corrosion heat transfer media;
2. the heat exchange plate is formed once, so that the heat exchange plate is strong in mechanical strength and good in pressure bearing performance of a heat transfer medium;
3. the plate type heat exchange structure has large heat exchange area and small heat exchange temperature difference;
4. the manufacturing cost is low.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A plastic blow-molded heat exchanger panel, comprising: a heat exchange plate body, a first heat transfer medium and a second heat transfer medium,
the heat exchange plate body comprises an inlet main pipe, an outlet main pipe and a plurality of hollow channels, wherein the inlet main pipe, the outlet main pipe and the hollow channels are connected and isolated in the plane direction through connecting strips, the inlet main pipe is communicated with inlets of the hollow channels, the hollow channels are arranged in a serpentine loop mode, outlets of the hollow channels are communicated with the outlet main pipe, a circulation channel of a first heat transfer medium is formed inside the heat exchange plate body, and a second heat transfer medium is supplied to the outer side surface of the heat exchange plate body to circulate.
2. A plastic blow-formed heat exchanger plate according to claim 1, wherein the inlet manifold communicates with the inlet of each of the plurality of hollow channels through a flow dividing structure, and the outlet of each of the plurality of hollow channels communicates with the outlet manifold through a flow collecting structure.
3. A plastic blow-molded heat exchanger plate according to claim 2, wherein the hollow cross-section of the hollow channel is circular or elliptical: the diameter of the circular hollow section is 2-20mm, and the wall thickness is 0.3-3.0 mm; the length of the major axis and the minor axis of the oval hollow section is 2-20mm, and the wall thickness is 0.3-3.0 mm.
4. A plastic blow-molded heat exchanger plate according to claim 2, wherein the tie bars have a width of 1-20mm and a thickness of 0.3-3.0 mm.
5. The plastic blow-molded heat exchange plate of claim 1, wherein the first heat transfer medium is a hot side heat transfer medium, the second heat transfer medium is a cold side heat transfer medium, and the hot side heat transfer medium and the cold side heat transfer medium exchange heat through the plate walls on the inner side and the outer side of the heat exchange plate body.
6. A process for manufacturing a plastic blow-molded heat exchanger plate according to claim 1, characterized by the following preparation steps:
s1, preparing a heat exchange plate mold:
the heat exchange plate mold consists of a left mold and a right mold, wherein the shape of an inner cavity formed by closing the two molds is matched with the shape of the heat exchange plate, and the molds are made of alloy aluminum;
s2, extruding the parison: feeding plastic particles into a hopper of a single-screw extruder or a double-screw extruder, extruding a hollow plastic pipe with a certain diameter in a semi-molten state, feeding the hollow plastic pipe into a storage cylinder, preserving heat to prevent cooling deformation, determining the diameter of the extruded hollow plastic pipe according to the circumference of the transverse section of the heat exchange plate, and determining the extrusion thickness according to the pressure bearing requirement of the hollow channel of the heat exchange plate;
s3, cutting the parison: cutting the parison according to the longitudinal length of the heat exchange plate, and quickly descending the storage cylinder with the cut hollow pipe parison to the centers of the two separated half molds;
s4, mold closing: slowly closing the two half molds at a certain speed, and firstly contacting the lower sides of the two half molds to ensure that the air in the hollow part of the hollow channel parison keeps a certain pressure in the closing process, and simultaneously discharging part of the air in the hollow part from the upper part in the final closing stroke to ensure that the walls of the hollow tube pair of the finished heat exchange plate are not bonded with each other;
s5, inflation: after the die assembly is finished, connecting an inflation inlet to an outlet at the upper part of a heat exchange plate hollow tube, injecting high-pressure air to blow and expand the heat exchange plate hollow tube to reach the shape of a die cavity, controlling the inflation pressure between 0.2 and 0.7Mpa as high as possible, controlling the blow molding temperature to be 80 to 280 ℃, ensuring that the plastic is attached to the wall of the die, ensuring that the wall thickness of a hollow channel is uniform, and keeping the blowing and expanding time to be 10 to 45 s;
s6, cooling: in the process of inflation and pressure maintaining, the heat exchange plate finished product is rapidly radiated through the aluminum mold shell, or forced air convection cooling is carried out on the aluminum mold shell, and the plastic is gradually solidified and shaped in the cooling process;
s7, air bleeding: after the plastic heat exchange plate is solidified and shaped, the high-pressure inflation inlet is removed for deflation;
s8, opening the die and finishing: and after the air release is finished, separating the two half dies, taking out the heat exchange plate blank, and finishing to finish the manufacture of the heat exchange plate finished product.
7. The process of claim 1, wherein in step S2, the plastic particles are made of blow-molded high-density polyethylene, glass fiber modified high-density polyethylene, polypropylene, glass fiber modified polypropylene or glass fiber modified thermoplastic polyurethane.
8. The process according to claim 7, wherein the working temperature of the heat exchanger plate is-100-80 ℃ when the blow-molded high-density polyethylene is blown, the working temperature of the heat exchanger plate is-100-125 ℃ when the glass fiber modified high-density polyethylene is blown, the working temperature of the heat exchanger plate is-30-100 ℃ when the polypropylene is blown, the working temperature of the heat exchanger plate is-30-150 ℃ when the glass fiber modified polypropylene is blown, and the working temperature of the heat exchanger plate is-40-180 ℃ when the glass fiber modified thermoplastic polyurethane is blown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210064719.6A CN114383437A (en) | 2022-01-20 | 2022-01-20 | Plastic blow-molding heat exchange plate and manufacturing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210064719.6A CN114383437A (en) | 2022-01-20 | 2022-01-20 | Plastic blow-molding heat exchange plate and manufacturing process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114383437A true CN114383437A (en) | 2022-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210064719.6A Pending CN114383437A (en) | 2022-01-20 | 2022-01-20 | Plastic blow-molding heat exchange plate and manufacturing process thereof |
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| Country | Link |
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| CN (1) | CN114383437A (en) |
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- 2022-01-20 CN CN202210064719.6A patent/CN114383437A/en active Pending
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