A corrugated structure full heat exchange core assembled by electrostatic and a preparation method thereof

Abstract

The application discloses a full-heat exchange core body of corrugated structure assembled by electrostatic force and a preparation method thereof, and steps are as follows: thermoplastic resin sheet is pressed into corrugated film; the corrugated film is subjected to electrostatic charging and cutting; the full-heat film is attached to the corrugated film after electrostatic charging under the action of electrostatic force to obtain a composite; a plurality of the composite is staggered and stacked, and after being compressed, a full-heat core body unit is formed; glue solution is poured into one side of the corrugated channel formed by the corrugated film in the full-heat core body unit, and the glue solution flows out from the other side of the corrugated channel, and after the glue solution is solidified, electrostatic force is eliminated and burrs are cut off; a plurality of the full-heat core body units are stacked and bonded, and a bottom plate and a top plate are bonded at the bottom and the top, and a side strip is bonded at the side edge. The full-heat film is attached to the corrugated film under the action of electrostatic force, and waterproof adhesive is not used to bond between the corrugated film wave crest and the full-heat film, so that dead area caused by gluing is reduced; and continuous production is realized, and the labor cost required for manufacturing the full-heat core body is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of total heat exchanger technology, and in particular to a corrugated total heat exchange core assembled by electrostatics and its preparation method. Background Technology

[0002] In existing corrugated total heat exchangers, a layer of waterproof adhesive is typically applied to the contact line between the corrugated sheet and the total heat exchange membrane to bond the corrugated sheet crests to the membrane and prevent air leakage within the channels. For example, patent CN101266109A discloses a total heat exchanger and its manufacturing method, which involves stacking multiple heat exchange components consisting of hexagonal diaphragms and flow path forming components bonded to the diaphragms to form flow paths, and exchanging the sensible and latent heat of two gases through the diaphragms. Patent CN 216558440 U discloses a corrugated total heat exchanger that also requires additional corner protectors to reduce air leakage.

[0003] However, after applying adhesive between the corrugated peaks and the total heat exchange membrane, the total heat exchange membrane in that area loses its moisture exchange capacity. As market demands for higher total heat exchange core efficiency increase, the efficiency is often improved by reducing the height of the corrugated plate, while keeping the volume constant. The spacing between the corrugated peaks also decreases with the reduced height, ultimately leading to a significant increase in the adhesive-coated area. This reduces the effective area of ​​the total heat exchange membrane within the core, resulting in poor total heat exchange core efficiency. Furthermore, commercially available total heat exchange cores are currently expensive, with complex manufacturing processes and high labor costs. Summary of the Invention

[0004] This invention aims to overcome the aforementioned problems of existing corrugated total heat exchangers by providing a corrugated total heat exchange core assembled by electrostatics and its preparation method. By electret, the total heat exchange film is attached to the corrugated film under the action of electrostatic force, eliminating the need for waterproof adhesive between the corrugated film crest and the total heat exchange film, thus reducing the dead area caused by adhesive coating. Furthermore, it allows for continuous production, significantly reducing the labor costs required to manufacture the total heat exchange core.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for preparing a corrugated total heat exchange core assembled by electrostatics includes the following steps:

[0007] (1) Press thermoplastic resin sheets into corrugated film;

[0008] (2) Electretize and cut the corrugated membrane;

[0009] (3) Under the action of electrostatic force, the total thermal film is attached to the corrugated film after electret to obtain a composite.

[0010] (4) Several composites are stacked in an alternating manner and compressed to form a full thermal core unit;

[0011] (5) Pour adhesive into one side of the corrugated channel formed by the corrugated film in the fully heated core unit and let the adhesive flow out from the other side of the corrugated channel. After the adhesive has cured, immerse the fully heated core unit in water to eliminate static electricity and then cut off the burrs.

[0012] (6) Stack and bond several full-heat core units, and bond the bottom plate and top plate at the bottom and top, and bond the side strips to the sides to obtain the corrugated full-heat exchange core.

[0013] This invention first presses thermoplastic resin sheets into corrugated film, then uses electret technology to attach the total heat exchange film onto the corrugated film under electrostatic force. After cutting, the film is stacked in two staggered directions, pressed tightly, and then glued and cured to eliminate static electricity. The burrs are then removed, and end caps are added to complete the production of the total heat exchange corrugated core. This invention does not use waterproof adhesive to bond the corrugated film crests and the total heat exchange film; instead, they are assembled using electrostatic force. There is no adhesive at the contact points between the corrugated film and the total heat exchange film, reducing the dead area caused by adhesive application and greatly increasing the usable area of ​​the total heat exchange film, thereby improving the total heat exchange efficiency. Furthermore, the method in this invention eliminates the time-consuming and labor-intensive adhesive application step, and precise alignment is not required during stacking, resulting in lower requirements for edge neatness. Subsequent burr removal achieves neat boundaries, significantly reducing the time cost required to produce the total heat exchange core. Meanwhile, the present invention performs potting and curing after stacking and pressing. The adhesive is poured in from one side of the corrugated channel and flows out from the other side. The adhesive will adhere to the contact area between the corrugated film and the total heat exchange film. After curing, it forms a continuous barrier layer, which can greatly improve the structural strength of the total heat exchange core and eliminate the need for an outer frame.

[0014] Preferably, the thermoplastic resin sheet in step (1) is a PP cast film with surface corona treatment.

[0015] Preferably, in step (1), the thermoplastic resin sheet is pressed by a corrugating machine at a temperature of 75-85°C and the speed of the thermoplastic resin sheet passing through the corrugating machine is 1-3 m / s.

[0016] Preferably, the width of the corrugated film obtained in step (1) is 200-800 mm, the corrugation height is 0.7-2 mm, and the corrugation span is 1-5 mm.

[0017] Preferably, in step (2), the corrugated film is electreted by a high-voltage electric field with a strength of 1-3 kV / cm, a width of 1-2 m, and a velocity of 1-3 m / s through the high-voltage electric field.

[0018] Preferably, in step (4), the composites are stacked in an alternating manner with adjacent composites staggered at 90°.

[0019] The present invention also provides a corrugated total heat exchange core obtained by electrostatic assembly using the above-described preparation method, comprising a core body formed by stacking and bonding several total heat exchange core units; a bottom plate is bonded to the bottom surface of the core body, a top plate is bonded to the top surface, and side strips are bonded to the sides; the total heat exchange core unit is formed by stacking several composites in an alternating manner; the composite includes a corrugated film and a total heat exchange film attached to the corrugated film by electrostatic action.

[0020] Preferably, the height of the total heat exchange core unit is 20-40 mm; the height of the corrugated total heat exchange core is 20-800 mm.

[0021] Preferably, the bottom plate and the top plate are PP injection molded plates with a layer of sponge bonded to one side, the sponge is in contact with the core body, and the material in the core body that is in contact with the sponge is corrugated film rather than full heat-resistant film.

[0022] Preferably, the thickness of the PP injection molded sheet is 2-4 mm, and the thickness of the sponge is 3-5 mm.

[0023] Therefore, the present invention has the following beneficial effects:

[0024] (1) No adhesive is applied at the contact point between the corrugated film and the total heat film, which increases the utilization area of ​​the total heat film and improves the total heat efficiency;

[0025] (2) Eliminate the time-consuming and labor-intensive glue application process, optimize the stacking method, and significantly reduce the time cost required to manufacture the full heat exchange core;

[0026] (3) The glue is poured and cured, which greatly improves the structural strength of the heat exchanger and eliminates the outer frame. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the electret tooling of the present invention.

[0028] Figure 2 This is a schematic diagram of the exploded structure of the composite of the present invention.

[0029] Figure 3 This is a schematic diagram of the stacking fixture of the present invention.

[0030] Figure 4 This is a schematic diagram of the stacking direction of the composite of the present invention.

[0031] Figure 5 This is a schematic diagram of the clamping fixture of the present invention.

[0032] Figure 6 This is a schematic diagram of the cured adhesive inside the corrugated film of the present invention.

[0033] Figure 7 This is an exploded structural diagram of the corrugated structure total heat exchange core of the present invention.

[0034] Figure 8 This is a schematic diagram of the corrugated structure total heat exchange core of the present invention.

[0035] Figure 9 yes Figure 8 A magnified view of part A in the image.

[0036] Among them, 1-corrugated film, 2-high voltage power supply transmitter, 3-grounding roller, 4-full heat film, 5-composite body, 6-full heat core unit, 7-stack fixture, 8-pressing fixture, 9-clamping plate, 10-cured adhesive, 11-top plate, 12-bottom plate, 13-side strip, 14-core body. Detailed Implementation

[0037] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0038] In this invention, unless otherwise specified, all equipment and raw materials are available from the market or commonly used in the industry. Unless otherwise specified, the methods in the following embodiments are conventional methods in the art.

[0039] General Implementation Examples:

[0040] A method for preparing a corrugated total heat exchange core assembled by electrostatics includes the following steps:

[0041] (1) Preparation of corrugated film: Thermoplastic resin sheet is pressed into corrugated film 1;

[0042] (2) Electret: using, for example Figure 1 The electret fixture shown uses a high voltage electric field to electret the corrugated film 1. There is a high voltage power supply transmitter 2 5cm above the corrugated film 1. The corrugated film is in direct contact with the grounding roller 3.

[0043] (3) Fixed-length cutting: The corrugated film after electret is cut to a fixed length, and the total thermal film 4 is also cut to the same size;

[0044] (4) Full heat film bonding: Figure 2 As shown, under the action of electrostatic force, the total thermal film 4 is attached to the corrugated film 1 after electret to obtain the composite 5.

[0045] (5) Composite stacking: In such Figure 3 The stacking fixture 7 shown depicts several composites 5 stacked to form a fully thermal core unit 6; as... Figure 4 As shown, adjacent composite layers are stacked in an alternating manner during stacking;

[0046] (6) Pressing: Use as follows Figure 5The clamping fixture 8 shown simultaneously clamps several fully heated core units 6, with clamping plates 9 at both ends of each fully heated core unit;

[0047] (7) Adhesive Pouring and Curing: Adhesive is poured into one side of the corrugated channel formed by the corrugated film in the fully heated core unit, and the adhesive flows out from the other side of the corrugated channel. After the adhesive adhering to the corrugated channel cures, it is as follows: Figure 6 As shown, the cured adhesive 10 is formed;

[0048] (8) Eliminate static electricity: Immerse the entire thermal core unit in water to eliminate static electricity;

[0049] (9) Deburring: Use cutting equipment to remove the burrs exposed by the clamping fixture;

[0050] (10) Assembly: such as Figures 7-9 As shown, several full-heat core units are stacked, and adjacent full-heat core units are glued together to obtain a core body 14; a bottom plate 12 and a top plate 11 are glued to the bottom and top of the core body, and side strips 13 are glued to the sides to obtain a corrugated full-heat exchange core.

[0051] In one specific implementation, the thermoplastic resin sheet in step (1) is a PP cast film with surface corona treatment.

[0052] In one specific implementation, in step (1), the thermoplastic resin sheet is pressed by a corrugating machine at a temperature of 75-85°C and the speed of the thermoplastic resin sheet passing through the corrugating machine is 1-3 m / s.

[0053] In one specific implementation, the width of the corrugated film obtained in step (1) is 200-800 mm, the corrugation height is 0.7-2 mm, and the corrugation span is 1-5 mm.

[0054] In one specific implementation, in step (2), the corrugated membrane is electreted by a high-voltage electric field. The high-voltage electric field strength is 1-3 kV / cm, the high-voltage electric field width is 1-2 m, and the speed of the corrugated membrane passing through the high-voltage electric field is 1-3 m / s.

[0055] As a specific implementation, during the bonding process in step (4), the edges of the heat-generating film do not extend more than 3 mm beyond the corrugated film and do not shrink more than 3 mm into the corrugated film.

[0056] In one specific implementation, in step (5), the composites are stacked in an alternating manner with adjacent composites staggered at 90°.

[0057] In one specific implementation, during the stacking process in step (5), one side is fully aligned with the tooling and the error between adjacent sides does not exceed 5mm.

[0058] In one specific implementation, the height of the full-heat core unit obtained in step (6) is 20-40 mm.

[0059] In one specific implementation, after the glue is poured and cured along one side of the full thermal core unit in step (7), the glue is poured and cured on the adjacent side in the same way until all sides of the full thermal core unit are filled and cured.

[0060] In one specific implementation, the height of the corrugated structure heat exchange core obtained in step (10) is 20 to 800 mm.

[0061] As a specific implementation, the bottom plate and top plate mentioned in step (10) are PP injection molded plates with a layer of sponge bonded to one side. The sponge is in contact with the core body, and the material in the core body that is in contact with the sponge is corrugated film rather than full heat film.

[0062] In one specific implementation, the thickness of the PP injection-molded sheet is 2-4 mm, and the thickness of the sponge is 3-5 mm.

[0063] Example 1:

[0064] A method for preparing a corrugated total heat exchange core assembled by electrostatics includes the following steps:

[0065] (1) Preparation of corrugated film: PP cast film with a thickness of 90μm and surface corona treatment is pressed into a corrugated film with a width of 200mm, a corrugation height of 1.35mm, and a corrugation span of 3mm by a corrugating machine; the temperature of the corrugating roller in the corrugating machine is 80℃ during pressing, and the speed of the PP cast film passing through the corrugating machine is 2m / s;

[0066] (2) Electret: Using an electret fixture, the corrugated film is electretted by a high voltage electric field, so that the surface of the corrugated film is electrostatic; the high voltage electric field strength is 2kV / cm, the high voltage electric field width is 1.5m, and the speed of the corrugated film passing through the high voltage electric field is 2m / s;

[0067] (3) Fixed-length cutting: The electret corrugated film is cut into 200mm×200mm squares in the cutting machine, and the total heat film is also cut into the same size;

[0068] (4) Full heat film bonding: Under the action of electrostatic force, the full heat film is flattened and bonded to the corrugated film after electret, with the edges not exceeding 3mm beyond the corrugated film and not shrinking into the corrugated film by more than 3mm, to obtain a composite.

[0069] (5) Composite stacking: The composites are stacked in an alternating manner with adjacent composites at 90°. The stacking height is 40mm. During stacking, one side is in contact with the stacking fixture and is fully aligned. The error between adjacent sides does not exceed 5mm.

[0070] (6) Pressing: Use a pressing fixture to press the four stacked composites together to form a fully thermal core unit. Each fully thermal core unit has clamps at both ends.

[0071] (7) Filling and curing: Fill a two-component sealant into one side of the corrugated channel formed by the corrugated membrane and the full-heating membrane in the full-heating core unit, and let the sealant flow out from the other side of the corrugated channel. The filling position is within 83-93mm away from the center line of the full-heating core unit. After the sealant adhering to the corrugated channel has cured, repeat the same steps on the adjacent side until all four sides of the full-heating core unit have been filled and cured.

[0072] (8) Eliminate static electricity: Immerse the entire thermal core unit in water to eliminate static electricity;

[0073] (9) Rough edge removal: Use cutting equipment to remove the rough edges around the core unit. The size of the cut core unit is 176×176mm. The cutting position is 88mm away from the center line of the full-heat core unit.

[0074] (10) Assembly: Apply a layer of two-component sealant to the bottom of a full-heat core unit, place the full-heat core unit on the base plate, apply two-component sealant to the top of the full-heat core unit along the corrugated direction, and then stack the next full-heat core unit on top. Stack several full-heat core units together, cover with the top plate so that the height of the stack is 200mm, apply two-component sealant to the top of the full-heat core unit and bond it to the top plate; the top plate and the base plate are 3mm thick PP injection molded plates with a length and width of 180mm×180mm, and a 4mm thick sponge is glued to one side. The sponge is in contact with the core body, and the material in contact with the sponge in the core body is corrugated film rather than full-heat film; then apply two-component sealant to the four sides of the core body, attach the edge strips, and after the two-component sealant has cured, the finished corrugated structure full-heat exchange core is obtained.

[0075] Example 2:

[0076] A method for preparing a corrugated total heat exchange core assembled by electrostatics includes the following steps:

[0077] (1) Preparation of corrugated film: PP cast film with a thickness of 90μm and corrugated surface is pressed into a corrugated film with a width of 300mm, a corrugation height of 1.35mm, and a corrugation span of 3mm by a corrugating machine; the temperature of the corrugating roller in the corrugating machine is 80℃ during pressing, and the speed of the PP cast film passing through the corrugating machine is 2m / s;

[0078] (2) Electret: Using an electret fixture, the corrugated film is electretted by a high voltage electric field, so that the surface of the corrugated film is electrostatic; the high voltage electric field strength is 2kV / cm, the high voltage electric field width is 1.5m, and the speed of the corrugated film passing through the high voltage electric field is 2m / s;

[0079] (3) Fixed-length cutting: The electret corrugated film is cut into 300mm×300mm squares in the cutting machine, and the total heat film is also cut into the same size;

[0080] (4) Full heat film bonding: Under the action of electrostatic force, the full heat film is flattened and bonded to the corrugated film after electret, with the edges not exceeding 3mm beyond the corrugated film and not shrinking into the corrugated film by more than 3mm, to obtain a composite.

[0081] (5) Composite stacking: The composites are stacked in an alternating manner with adjacent composites at 90°. The stacking height is 40mm. During stacking, one side is in contact with the stacking fixture and is fully aligned. The error between adjacent sides does not exceed 5mm.

[0082] (6) Pressing: Use a pressing fixture to press the four stacked composites together to form a fully thermal core unit. Each fully thermal core unit has clamps at both ends.

[0083] (7) Injection and curing: Inject two-component sealant into one side of the corrugated channel formed by the corrugated membrane and the full-heating membrane in the full-heating core unit, and let the sealant flow out from the other side of the corrugated channel. The injection position is within the range of 133-143mm away from the center line of the full-heating core unit. After the sealant adhering to the corrugated channel has cured, repeat the same steps on the adjacent side until all four sides of the full-heating core unit have been injected and cured.

[0084] (8) Eliminate static electricity: Immerse the entire thermal core unit in water to eliminate static electricity;

[0085] (9) Rough edge removal: Use cutting equipment to remove the rough edges around the core unit. The size of the cut core unit is 276*276mm. The cutting position is 138mm away from the center line of the full-heat core unit.

[0086] (10) Assembly: Apply a layer of two-component sealant to the bottom of a full-heat core unit, place the full-heat core unit on the base plate, apply two-component sealant to the top of the full-heat core unit along the corrugated direction, and then stack the next full-heat core unit on top. Stack several full-heat core units together, cover with the top plate so that the height of the stack is 400mm, apply two-component sealant to the top of the full-heat core unit and bond it to the top plate; the top plate and the base plate are 3mm thick PP injection molded plates with a length and width of 280mm×280mm, and a 4mm thick sponge is glued to one side. The sponge is in contact with the core body, and the material in contact with the sponge in the core body is corrugated film rather than full-heat film; then apply two-component sealant to the four sides of the core body, attach the edge strips, and after the two-component sealant has cured, the finished corrugated structure full-heat exchange core is obtained.

[0087] Example 3:

[0088] A method for preparing a corrugated total heat exchange core assembled by electrostatics includes the following steps:

[0089] (1) Preparation of corrugated film: PP cast film with a thickness of 90μm and surface corona treatment is pressed into a corrugated film with a width of 200mm, a corrugation height of 1.25mm, and a corrugation span of 2.5mm by a corrugating machine; the temperature of the corrugating roller in the corrugating machine is 80℃ during pressing, and the speed of the PP cast film passing through the corrugating machine is 2m / s;

[0090] (2) Electret: Using an electret fixture, the corrugated film is electretted by a high voltage electric field, so that the surface of the corrugated film is electrostatic; the high voltage electric field strength is 2kV / cm, the high voltage electric field width is 1.5m, and the speed of the corrugated film passing through the high voltage electric field is 2m / s;

[0091] (3) Fixed-length cutting: The electret corrugated film is cut into 200mm×200mm squares in the cutting machine, and the total heat film is also cut into the same size;

[0092] (4) Full heat film bonding: Under the action of electrostatic force, the full heat film is flattened and bonded to the corrugated film after electret, with the edges not exceeding 3mm beyond the corrugated film and not shrinking into the corrugated film by more than 3mm, to obtain a composite.

[0093] (5) Composite stacking: The composites are stacked in an alternating manner with adjacent composites at 90°. The stacking height is 40mm. During stacking, one side is in contact with the stacking fixture and is fully aligned. The error between adjacent sides does not exceed 5mm.

[0094] (6) Pressing: Use a pressing fixture to press the four stacked composites together to form a fully thermal core unit. Each fully thermal core unit has clamps at both ends.

[0095] (7) Filling and curing: Fill a two-component sealant into one side of the corrugated channel formed by the corrugated membrane and the full-heating membrane in the full-heating core unit, and let the sealant flow out from the other side of the corrugated channel. The filling position is within 83-93mm away from the center line of the full-heating core unit. After the sealant adhering to the corrugated channel has cured, repeat the same steps on the adjacent side until all four sides of the full-heating core unit have been filled and cured.

[0096] (8) Eliminate static electricity: Immerse the entire thermal core unit in water to eliminate static electricity;

[0097] (9) Rough edge removal: Use cutting equipment to remove the rough edges around the core unit. The size of the cut core unit is 176×176mm. The cutting position is 88mm away from the center line of the full-heat core unit.

[0098] (10) Assembly: Apply a layer of two-component sealant to the bottom of a full-heat core unit, place the full-heat core unit on the base plate, apply two-component sealant to the top of the full-heat core unit along the corrugated direction, and then stack the next full-heat core unit on top. Stack several full-heat core units together, cover with the top plate so that the height of the stack is 200mm, apply two-component sealant to the top of the full-heat core unit and bond it to the top plate; the top plate and the base plate are 3mm thick PP injection molded plates with a length and width of 180mm×180mm, and a 4mm thick sponge is glued to one side. The sponge is in contact with the core body, and the material in contact with the sponge in the core body is corrugated film rather than full-heat film; then apply two-component sealant to the four sides of the core body, attach the edge strips, and after the two-component sealant has cured, the finished corrugated structure full-heat exchange core is obtained.

[0099] Comparative Example 1:

[0100] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 was prepared using a coating method, the steps of which are as follows:

[0101] A method for preparing a corrugated total heat exchange core assembled by electrostatics includes the following steps:

[0102] (1) Preparation of corrugated film: PP cast film with a thickness of 90μm and surface corona treatment is pressed into a corrugated film with a width of 200mm, a corrugation height of 1.35mm, and a corrugation span of 3mm by a corrugating machine; the temperature of the corrugating roller in the corrugating machine is 80℃ during pressing, and the speed of the PP cast film passing through the corrugating machine is 2m / s;

[0103] (2) Fixed-length cutting: The corrugated film is cut into 200mm×200mm squares in the cutting machine, and the full heat film is also cut into the same size;

[0104] (3) Applying adhesive: Apply a two-component sealant to one side of the corrugated membrane, then flatten and attach the heat-generating film to the corrugated membrane, ensuring that the edges do not extend beyond the membrane, thus obtaining a composite.

[0105] (4) Composite stacking: The composites are stacked in an alternating manner with adjacent composites at 90°. The stacking height is 40mm. During stacking, one side is in contact with the stacking fixture and is fully aligned. The error between adjacent sides does not exceed 5mm.

[0106] (5) Pressing: Use a pressing fixture to press the four stacked composites together to form a fully thermal core unit. Each fully thermal core unit has clamps at both ends.

[0107] (6) Injection and curing: Inject two-component sealant into one side of the corrugated channel formed by the corrugated membrane and the full-heating membrane in the full-heating core unit, and let the sealant flow out from the other side of the corrugated channel. The injection position is within 83-93mm away from the center line of the full-heating core unit. After the sealant adhering to the corrugated channel has cured, repeat the same steps on the adjacent side until all four sides of the full-heating core unit have been injected and cured.

[0108] (7) Rough edge removal: Use cutting equipment to remove the rough edges around the core unit. The size of the cut core unit is 176×176mm. The cutting position is 88mm away from the center line of the full-heat core unit.

[0109] (8) Assembly: Apply a layer of two-component sealant to the bottom of a full-heat core unit, place the full-heat core unit on the base plate, apply two-component sealant to the top of the full-heat core unit along the corrugated direction, and then stack the next full-heat core unit on top. Stack several full-heat core units together, cover with the top plate so that the height of the stack is 200mm, apply two-component sealant to the top of the full-heat core unit and bond it to the top plate; the top plate and the base plate are 3mm thick PP injection molded plates with a length and width of 180mm×180mm, and a 4mm thick sponge is glued to one side. The sponge is in contact with the core body, and the material in contact with the sponge in the core body is corrugated film rather than full-heat film; then apply two-component sealant to the four sides of the core body, attach the edge strips, and after the two-component sealant has cured, the finished corrugated structure full-heat exchange core is obtained.

[0110] The effective total heat film area of ​​the total heat exchange cores prepared in the above embodiments and comparative examples was calculated, and the results are shown in Table 1.

[0111] Table 1: Specific surface area test results.

[0112] project Example 1 Example 2 Example 3 Comparative Example 1 <![CDATA[Total heat film specific surface area (m 2 / m 3 )]]> 595.3 649.8 646.38 413.41 <![CDATA[Effective total heat transfer membrane area of a single total heat exchanger core (m 2 )]]> 3.86 20.38 4.19 2.68

[0113] The air resistance of the total heat exchange cores prepared in the above embodiments and comparative examples was tested according to the method in standard GB / T 21087-2020. The test conditions were: temperature 23.4℃ and humidity 51%. The results are shown in Table 2.

[0114] Table 2: Wind resistance test results.

[0115]

[0116] The air leakage rate of the total heat exchange cores prepared in the above embodiments and comparative examples was tested, and the results are shown in Table 3.

[0117] Table 3: Results of air leakage rate test.

[0118]

[0119] As can be seen from the data in Tables 1 to 3, the total heat exchange cores prepared by electrostatic assembly using the method of the present invention in Examples 1 to 3 have a significantly increased effective total heat exchange film area compared with the total heat exchange core prepared by the traditional coating method in Comparative Example 1.

Claims

1. A method for preparing a corrugated total heat exchange core assembled by electrostatics, characterized in that, Includes the following steps: (1) Pressing thermoplastic resin sheets into corrugated film; (2) Electretize and cut the corrugated membrane; (3) Under the action of electrostatic force, the total thermal film is attached to the corrugated film after electret to obtain a composite; (4) Several composites are stacked in an alternating manner and compressed to form a fully thermal core unit; (5) Pour adhesive into one side of the corrugated channel formed by the corrugated film in the fully heated core unit and let the adhesive flow out from the other side of the corrugated channel. After the adhesive has cured, immerse the fully heated core unit in water to eliminate static electricity and then cut off the burrs. (6) Stack and bond several full-heat core units, and bond the bottom plate and top plate at the bottom and top, and bond the side strips on the sides.

2. The method for preparing a corrugated total heat exchange core assembled by electrostatics according to claim 1, characterized in that, The thermoplastic resin sheet in step (1) is a PP cast film with surface corona treatment.

3. The method for preparing a corrugated total heat exchange core assembled by electrostatics according to claim 1 or 2, characterized in that, In step (1), the thermoplastic resin sheet is pressed by a corrugating machine at a temperature of 75~85℃ and the thermoplastic resin sheet passes through the corrugating machine at a speed of 1~3m / s.

4. The method for preparing a corrugated total heat exchange core assembled by electrostatics according to claim 1, characterized in that, The width of the corrugated film obtained in step (1) is 200~800mm, the corrugation height is 0.7~2mm, and the corrugation span is 1~5mm.

5. The method for preparing a corrugated total heat exchange core assembled by electrostatics according to claim 1, characterized in that, In step (2), the corrugated membrane is electreted by a high voltage electric field. The high voltage electric field strength is 1~3kV / cm, the high voltage electric field width is 1~2m, and the speed of the corrugated membrane through the high voltage electric field is 1~3m / s.

6. The method for preparing a corrugated total heat exchange core assembled by electrostatics according to claim 1, characterized in that, In step (4), the composites are stacked in an alternating manner with adjacent composites at 90° intervals.

7. A corrugated total heat exchange core with electrostatic assembly, prepared by the method described in any one of claims 1 to 6, characterized in that, It includes a core body formed by stacking and bonding several fully thermal core units; a bottom plate is bonded to the bottom surface of the core body, a top plate is bonded to the top surface, and side strips are bonded to the sides; the fully thermal core unit is formed by stacking several composites in an alternating manner; the composite includes a corrugated film and a fully thermal film attached to the corrugated film by electrostatic action.

8. The corrugated structure total heat exchange core assembled by electrostatics according to claim 7, characterized in that, The height of the full heat exchange core unit is 20~40mm; the height of the corrugated full heat exchange core is 20~800mm.

9. The corrugated structure total heat exchange core assembled by electrostatics according to claim 7, characterized in that, The bottom plate and top plate are PP injection molded plates with a layer of sponge bonded to one side. The sponge is in contact with the core body, and the material in the core body that is in contact with the sponge is corrugated film rather than full heat-resistant film.

10. The corrugated structure total heat exchange core assembled by electrostatics according to claim 9, characterized in that, The thickness of PP injection molded sheets is 2~4mm, and the thickness of sponge is 3~5mm.

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