WO2016119364A1

WO2016119364A1 - Tube-and-plate type compound heat exchange sheet and manufacturing method therefor

Info

Publication number: WO2016119364A1
Application number: PCT/CN2015/081390
Authority: WO
Inventors: 李志明; 谭栋; 张勇
Original assignee: 广州市华德工业有限公司
Priority date: 2015-01-28
Filing date: 2015-06-12
Publication date: 2016-08-04
Also published as: CN105987623A; CN105987623B

Abstract

A tube-and-plate type compound heat exchange sheet and a method for manufacturing same. The tube-and-plate type compound heat exchange sheet comprises a coil pipe (1) formed by a shaped heat exchange pipe, and further comprises a heat transfer plate (2). The heat transfer plate (2) is provided with an accommodation groove (21). The shape of the accommodation groove (21) matches the shape of the coil pipe (1). The coil pipe (1) is placed in the accommodation groove (21). The gap between the coil pipe (1) and the accommodation groove (21) is filled with a thermally conductive bonding layer (3). The thermally conductive bonding layer (3) ensures full contact between the heat transfer plate (2) and the coil pipe (1), the coil pipe (1) producing a ribbed effect with the heat transfer plate (2), thereby increasing the effective heat exchange area. The heat transfer plate (2) can also drain cooling water to form a continuous water flow surface, thereby enlarging the evaporation surface area of the cooling water. The effective heat exchange area and the evaporation area of the cooling water are increased, improving heat exchange efficiency and also reducing condenser size.

Description

Plate tube composite heat exchange sheet and manufacturing method thereof

Technical field

The invention relates to the field of heat exchange equipment, in particular to a plate-type, coil-type composite heat exchange sheet, and a manufacturing method thereof.

Background technique

At present, the evaporative condensers on the market usually use a curved coil to form a heat exchanger, and the outer surface of the heat exchanger is cooled by spray water, and the circulating spray water is used to evaporate and remove heat. However, the outer surface of the heat exchanger tube of the coil heat exchanger is generally a smooth surface, and the heat exchange efficiency is low. At the same time, the surface area of the cooling water evaporating heat transfer is small, and the spacing of the coils needs to be increased to increase the heat exchange time between the cooling water and the air, resulting in a bulky volume of the entire heat exchanger. On the other hand, since there is no medium to guide the flow of cooling water between the upper and lower tubes of the coil, when the cooling water descends from above, under the traction of the vertical wind direction, the cooling water is disorderly fluttering and easy to generate flying water, and the coil is clothed. The water is uneven, easy to store dry spots, reduce heat exchange capacity and there is a risk of scaling.

In the patent of CN202836298U, the applicant has previously disclosed a heat exchange tube for a coiled coil condenser, and a filler sheet is installed between the coils to guide the spray water to form a water film. The problem of disorderly flying water of cooling water is solved. The multi-piece packing piece is attached to the coil tube by means of a buckle or the like, and the installation and disassembly are cumbersome; in such a mounting manner, the packing piece and the coil tube are not closely installed, which can meet the requirement of guiding the spray water to form a water film. However, the need for direct heat exchange with the coil cannot be met, and the filler sheet is not a heat exchange material and cannot exchange heat with the coil. Therefore, although the invention patent has been improved to some extent Thermal efficiency, but since the heat exchange efficiency is improved only by increasing the utilization rate of the cooling water, the heat exchange efficiency is not greatly improved.

Summary of the invention

In view of the above-mentioned deficiencies of the prior art, the present invention solves two technical problems. First, the heat exchange efficiency of the coil is changed to increase the heat exchange efficiency to a greater extent. Second, a manufacturing method capable of fabricating the improved structure is provided.

In order to solve the above technical problem, the technical solution adopted by the present invention is a plate-tube composite heat exchange sheet, which comprises a coil tube processed by a heat exchange tube, and further comprises a heat transfer plate; the heat transfer plate is provided with a groove The shape of the mounting groove matches the shape of the coil; the coil is placed in the mounting groove, and the gap between the coil and the mounting groove is filled with a thermally conductive adhesive layer. The heat transfer plate can guide the spray cooling water from the upper heat exchange tube to the lower heat exchange tube to improve the utilization of the cooling water; and at the same time, the heat conductive adhesive layer fills the gap between the full coil and the heat transfer plate to make the disk The tube is in full contact with the heat transfer plate, and the heat transfer plate becomes a rib of the coil, increasing the effective heat exchange area of the coil.

Preferably, the thermally conductive adhesive layer is a metal filled layer. Such a structure can be realized by soaking liquid metal and then cooling, so that the heat conductive adhesive layer can be sufficiently filled into the gap, and the heat conductivity of the metal is good, thereby further improving the rib formation of the heat transfer sheet.

More preferably, the gap between the coil and the seating groove is less than 10 mm. Such a structure has a small gap. When liquid metal immersion is performed, due to the viscosity of the liquid metal, the liquid metal may cause capillary action, and after penetrating into the inner surface of the heat transfer plate and the coil contact surface, a contact surface can be formed in the contact surface. a thin layer of uniform filler that not only completely fuses the heat transfer plate to the coil It is a whole, and the filling layer is thin to reduce the thermal resistance of contact between the heat transfer sheet and the coil.

More preferably, the heat transfer sheet is also stamped with a plurality of limiting slots and/or positioning pads. Such a structure ensures that the gap between the coil and the heat transfer plate can be sufficiently small when the liquid metal is immersed.

Preferably, the metal-filled layer is one or more of zinc, tin, aluminum, and copper. These metals have low melting point and low price, and are used for liquid metal immersion, which is extremely cost-effective.

In a preferred embodiment, the thermally conductive adhesive layer is a thermally conductive adhesive. Direct use of thermal adhesives makes processing easier.

The invention also discloses a manufacturing method of the plate tube composite heat exchange sheet: comprising the following steps:

1) providing a heat exchange tube and processing it into a coil;

2) providing a heat transfer sheet and forming a mounting groove on the heat transfer sheet, the shape of the seating groove matching the shape of the coil;

3) The coil is placed in the mounting groove, and a gap between the coil and the mounting groove is filled with a thermally conductive adhesive layer, and the thermally conductive adhesive layer bonds and fixes the coil and the mounting groove.

Preferably, the step 3) is specifically:

31) providing high temperature liquid metal;

32) Place the coil in the mounting slot;

33) immersing the heat exchanger sheet on which the coil is placed, immersing in the high temperature liquid metal, so that the high temperature liquid metal penetrates into the gap between the coil tube and the mounting groove;

34) The high temperature liquid metal is cooled and solidified, and the cooled metal is the thermally conductive adhesive layer.

More preferably, in the step 32), the method further comprises fixing the coil to the mounting groove portion, And keep the gap between the coil and the mounting groove less than 10 mm.

In a preferred embodiment, the thermally conductive adhesive layer is a thermal conductive adhesive; and the step 3) is specifically:

35) Applying a thermal conductive adhesive to the inner wall of the mounting groove and/or the outer wall of the coil;

36) Place the coil in the mounting groove and press it until the coil is bonded to the mounting groove.

Compared with the prior art, the plate-tube composite heat exchange sheet of the invention has the following beneficial effects:

1. The thermal conductive adhesive layer makes the heat transfer plate and the coil fully contact, so that the coil can generate a ribbing effect through the heat exchange plate and increase the effective heat exchange area;

2. The heat exchange plate can simultaneously drain the cooling water to form a continuous water flow surface, and increase the evaporation surface area of the cooling water;

3. Increasing the effective heat exchange area and the evaporation water evaporation area not only improves the heat exchange efficiency, but also helps to reduce the condenser volume.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of a composite tube heat exchanger sheet of the present invention.

2 is a schematic view showing the structure of a heat transfer plate of the plate-tube composite heat exchange sheet of the present invention.

Figure 3 is a cross-sectional view taken along line A-A of Figure 1.

detailed description

The specific embodiments, structures, features and functions of the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments, in which:

As shown in FIG. 1 and FIG. 2, the plate-tube composite heat exchange sheet of the present invention comprises a coil 1 processed by a heat exchange tube (the processing may be a bending of a long heat exchange tube into a coil, or may be The heat exchange tube of the curved section is welded to the heat exchange tube of the straight section to form a coil), and the heat transfer sheet 2 is further included. In this embodiment, the coil 1 is formed by continuous S-shaped bending of the heat exchange tubes, wherein the straight sections of the heat exchange tubes are substantially parallel or non-parallel, and the coil 1 can also adopt other suitable for use in the evaporation condenser. shape. The heat exchange tube of the coil 1 may be a copper tube, a stainless steel tube or a galvanized steel tube, etc., and the cross-sectional shape of the internal flow passage may be a circular shape, an elliptical shape, a spiral shape, a corrugated shape or an olive shape. As can be understood by those skilled in the art, the inner and outer surfaces of the coil 1 can adopt a smooth surface, preferably an enhanced heat transfer surface provided with internal and external threads, and the outer surface of the coil 1 can also be provided with a hydrophilic or anti-corrosive coating. Floor. The coil 1 is provided with an inlet and an outlet of a flow passage. The material of the heat transfer sheet 2 may be a carbon steel sheet, a stainless steel sheet, an aluminum sheet, a copper sheet or the like.

As shown in FIG. 2 and FIG. 3, the heat transfer plate 2 is provided with a receiving groove 21. In the embodiment, the receiving groove 21 is realized by punching the heat transfer plate 2, or may be produced. The heat transfer sheet 2 is directly formed; the shape of the seating groove 21 matches the shape of the coil 1. The coil 1 is placed in the seating groove 21, and a gap between the coil 1 and the seating groove 21 is filled with a thermally conductive adhesive layer 3. In this embodiment, the thermally conductive adhesive layer 3 is a metal-filled layer of zinc. The specific method may be that the heat transfer sheet 2 and the coil 1 are immersed in high temperature liquid zinc. The bubble causes the liquid zinc to flow into the gap between the coil 1 and the seating groove 21, fills the gap, and the viscosity of the liquid metal makes the two adhere to each other. When the liquid metal cools and solidifies into a solid state, it becomes the thermally conductive adhesive layer 3. It is filled between the coil 1 and the seating groove 21 to fix the two. In addition to zinc, tin, aluminum, copper and other metals or combinations thereof can be used, all of which have the characteristics of low melting point and low price, and are cost-effective.

Further, in this embodiment, the gap between the coil 1 and the seating groove 21 is less than 10 mm. When the liquid metal is immersed, due to the viscosity of the liquid metal, the liquid metal may undergo capillary action, infiltration and transmission. After the hot plate 2 and the inside of the contact surface of the coil 1, the thermally conductive adhesive layer 3 formed in the gap of the contact can be made uniform and thin, and the heat transfer sheet 2 and the coil 1 are completely fused together as a whole. Moreover, since the thickness of the thermally conductive adhesive layer 3 is thin, the contact thermal resistance between the heat transfer sheet 2 and the coil 1 is effectively reduced. The smaller the gap between the coil 1 and the seating groove 21, the more obvious the capillary action of the liquid metal permeation, the more uniform the thermal conductive adhesive layer 3 is formed, and the relative cost and processing difficulty are relatively large; the gap width of 10 mm is The cost is the best choice, and the gap width of 5 mm is the best cost-effective choice, and the optimal choice for uniformity within 3 mm. Furthermore, in order to ensure that the high temperature liquid metal is immersed, the distance between the coil 1 and the heat transfer plate 2 can be sufficiently small, and a plurality of limit grooves and/or positioning pads can be punched out on the heat transfer plate 2 (Fig. Not shown), before the immersion, the coil 1 is pre-fixed by the limit slot mounting or the positioning of the solder joint. It is also possible to pre-fix the two by means of a clamp, but the operation is complicated.

The heat of the coil 1 is conducted to the heat transfer sheet 2 through the thermally conductive adhesive layer 3, and the heat transfer sheet 2 becomes the rib of the coil 1, which greatly increases the heat exchange area and directly enhances the heat exchange effect of the coil 1; The hot plate 2 has the effect of guiding the cooling water so that the cooling water is on the heat transfer plate 2 The surface forms a continuous water flow, avoids the disordered water flying of the cooling water, and improves the utilization rate of the cooling water. In addition, since the heat transfer sheet 2 is integrated, the cooling water at the coupling with the coil 1 can be prevented from flowing alternately, and the water distribution rate can be ensured.

On the other hand, the thermal conductive adhesive layer 3 can be replaced by a thermal conductive adhesive; the thermal conductive adhesive is evenly applied to the mounting groove 21 of the heat transfer plate 2, and the coil 1 is directly placed into the mounting groove 21. It can be bonded (for some thermal adhesives that need to be combined, it is also necessary to apply a matching thermal adhesive on the coil 1), which is easy to install and simple in process. However, the existing thermal conductive adhesives, such as silicone thermal conductive adhesives, epoxy resin AB adhesives, and polyurethane thermal conductive adhesives, are not as strong as zinc, aluminum, etc., and are prone to unevenness during the laminating process, resulting in unevenness. When the coil 1 is adhered to the seating groove 21, an air layer insulation phenomenon may occur, which affects heat exchange efficiency.

In addition, the heat transfer plate 2 can also be provided with openings, corrugations, bends, water guides, dovetail grooves, ribs and the like to achieve an effect of increasing the water distribution effect, preventing flying water, and enhancing the robustness.

The invention also discloses a manufacturing method of a plate-tube composite heat exchange sheet, comprising the following steps:

1) A heat exchange tube is provided and processed into a coil 1. Specifically, the heat exchange tube can be bent and bent into the shape of the coil 1 as shown in FIG. 1 using a pipe bender or other common equipment. It is also possible to weld the heat exchange tubes of the curved section and the heat exchange tubes of the straight section into the shape of the coil 1.

2) Providing the heat transfer sheet 2, and forming the mounting groove 21 in the heat transfer sheet 2 (in this embodiment, the heat transfer sheet 2 is punched and punched out the seating groove 21), the shape of the seating groove 21 Matches the shape of the coil 1. Other structures on the heat transfer sheet 2 can be processed together. Further, a plurality of elongated holes, round holes or other shaped through holes (not shown) may be formed at the mounting groove 21, and when the coil 1 is placed in the seating groove 21, a part of the coil 1 may be exposed. Outside the tank 21, it can be directly in contact with the condensed water. This method can increase the direct contact area between the coil and the water. At the same time, the opening of the hole can disturb the heat transfer of the copper tube due to the uneven flow of water, but it is certain To a lesser extent, the ribbing of the heat transfer sheets is weakened.

Step 1) and step 2) do not exist in the order.

3) The coil 1 is placed in the seating groove 21, and a gap between the coil 1 and the seating groove 21 is filled with a thermally conductive adhesive layer 3, which bonds the coil 1 and the seating groove 21 fixed. Specifically, the step 3) is:

31) Providing a high-temperature liquid metal; the metal may be melted at a high temperature using equipment such as a furnace, and the metal may be one or more selected from the group consisting of zinc, tin, aluminum, and copper.

32) The coil 1 is placed in the mounting groove 21; specifically, the limiting groove, the positioning welding point and the like may be pre-machined, and after the coil 1 is placed in the mounting groove 21, the limiting groove or the positioning welding point pair is passed. The coil 1 is partially fixed, which is convenient for the immersion operation, and is advantageous for ensuring a uniform thickness of the gap between the coil 1 and the seating groove 21; more preferably, the gap between the coil 1 and the seating groove 21 is less than 10 mm, which can The infiltrated metal creates a capillary effect that results in a thinner, more uniform fill.

34) The high temperature liquid metal is cooled and solidified, and the cooled metal is the thermally conductive adhesive layer. Preferably, after the immersion, the passivation cell is cooled to solidify the metal fill layer while forming a passivation layer on the surface to avoid oxidation of the metal fill layer. Natural cooling The way to cool.

In addition, a thermal conductive adhesive can also be selected as the thermal conductive adhesive layer; the step 3) is specifically:

35) applying a thermal conductive adhesive on the inner wall of the mounting groove 21 and/or the outer wall of the coil 1;

36) The coil 1 is placed in the seating groove 21 and pressed until the coil 1 is bonded to the seating groove 21.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention belong to the present invention. The scope of the claim.

Claims

The tube-tube composite heat exchange sheet comprises a coil processed from a heat exchange tube, characterized in that: a heat transfer plate is further included; the heat transfer plate is provided with a seating groove, and the shape of the receiving groove and the coil The shape is matched; the coil is placed in the mounting groove, and the gap between the coil and the mounting groove is filled with a heat conductive adhesive layer.
The plate tube composite heat exchange sheet according to claim 1, wherein the heat conductive adhesive layer is a metal filled layer.
The plate tube composite heat exchange sheet according to claim 2, wherein a gap between the coil and the seating groove is less than 10 mm.
The plate tube composite heat exchange sheet according to claim 3, wherein the heat transfer plate is further stamped with a plurality of limiting grooves and/or positioning pads.
The tube-tube composite heat exchange sheet according to claim 2, wherein the metal-filled layer is one or more of zinc, tin, aluminum, and copper.
The plate tube composite heat exchange sheet according to claim 1, wherein the heat conductive adhesive layer is a heat conductive adhesive.
The manufacturing method of the tube-tube composite heat exchange sheet is characterized in that the method comprises the following steps:

1) providing a heat exchange tube and processing it into a coil;

2) providing a heat transfer sheet and forming a mounting groove on the heat transfer sheet, the shape of the seating groove matching the shape of the coil;

3) The coil is placed in the mounting groove, and a gap between the coil and the mounting groove is filled with a thermally conductive adhesive layer, and the thermally conductive adhesive layer bonds and fixes the coil and the mounting groove.
The method for manufacturing a composite tube heat exchanger sheet according to claim 7, wherein the step 3) is specifically:

31) providing high temperature liquid metal;

32) Place the coil in the mounting slot;

33) immersing the heat exchanger sheet on which the coil is placed, immersing in the high temperature liquid metal, so that the high temperature liquid metal penetrates into the gap between the coil tube and the mounting groove;

34) The high temperature liquid metal is cooled and solidified, and the cooled metal is the thermally conductive adhesive layer.
The method for manufacturing a composite tube heat exchanger sheet according to claim 8, wherein in the step 32), the coil tube and the mounting groove portion are further fixed, and the gap between the coil and the mounting groove is less than 10 Millimeter.
The method of manufacturing a composite heat exchange sheet for a tube and tube according to claim 7, wherein the thermally conductive adhesive layer is a thermal conductive adhesive; and the step 3) is specifically:

35) Applying a thermal conductive adhesive to the inner wall of the mounting groove and/or the outer wall of the coil;

36) Place the coil in the mounting groove and press it until the coil is bonded to the mounting groove.