JP2660207B2 - Manufacturing method of indirect heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing an indirect heat exchanger in a cooling tower used for an air conditioner, a refrigeration system, and the like. (Prior art and problems) As this type of heat exchanger, Japanese Patent Application Laid-Open No. S51-100370 discloses a flat, vertical and mutually parallel liquid flowing down passage, and a plurality of these liquid flowing down passages. A heat exchange partition plate made of a plurality of synthetic resin plates having a flat air passage with a vertical surface formed therebetween and through which an air current flows, and in which these two fluid passages are in non-contact with each other. A heat exchanger for cooling towers, which is partitioned by a heat exchanger, is described. In the heat exchanger of the above publication, both walls of each air passage are formed by U-shaped members, and the parallel side walls of adjacent U-shaped members are bonded to each other by protruding rib portions. The liquid flow passage is formed by being connected to each other at the side edges by the connection panel. In the above-mentioned prior art, the liquid passage that is narrow and bent in order to slow down the flow rate of the liquid is such that dust and microorganisms adhere to their walls during a long period of use, and the liquid passage has a cross-sectional area. They are substantially narrow and cannot flow at a predetermined flow rate, overflowing at the supply side of these heat exchangers and not only inadvertently wetting their surroundings, but also causing loss of circulating refrigerant. Further, as described above, since the corrugated side walls of the adjacent U-shaped members are attached to each other at the protruding rib portions, it is not necessary to clean dust and microorganisms attached and retained in the liquid flow passage from the outside. It is an extremely difficult technique, almost impossible, and furthermore, it is troublesome to integrally bond these U-shaped members to each other to obtain a desired heat exchanger, which complicates the structure. Also, this kind of heat exchanger is provided above the filler,
In the case where the liquid discharged from the heat exchanger is sprayed on the filler, there is a disadvantage that the amount of the sprayed liquid (water) is insufficient and the flow rate of the entire cooling tower is insufficient. (Problems to be Solved) The present invention enables a liquid passage in a main portion of a gas-liquid non-contact (indirect) heat exchanger that performs heat exchange to be freely separated, thereby quickly clogging the fluid passage. It is an object of the present invention to manufacture an indirect heat exchanger which can be manufactured and further facilitated in manufacturing and assembling and whose structure is simplified, and an object of the present invention is to provide a method of manufacturing such a heat exchanger to the market. (Means for Solving the Problems) The present invention is directed to a flat, air flow having several flat liquid flowing passages parallel to each other in a vertical direction and a vertical surface formed between each of the liquid flowing passages. A method for manufacturing an indirect heat exchanger, comprising a horizontal air passage through which the two fluid passages are separated by a heat exchange partition plate made of a plurality of synthetic resin plates that keep the fluids out of contact with each other A) A predetermined number of heat exchange partition plates made of synthetic resin having the same shape and the same shape are vacuum formed from one synthetic resin plate by a vacuum forming method, and a large number of bulging portions are provided in the middle of each heat exchange partition plate. Is formed on the same side, and furthermore, a vertical uneven shape is formed along both sides of each partition plate so as to be hookable with each other, and the upper end thereof has the same dimension as the height of the bulging portion, and is L-shaped. A step of bending and molding to the same side as the bulging portion. b) The heat exchange partition plates are formed as a pair, and the top and bottom edges formed by inverting each other are connected to each other over their entire width and integrated to form a single heat exchanger unit. The opposed inwardly projecting portions are abutted to each other, and the intermediate portions of the two heat exchange partition plates are separated from each other to form one tunnel-shaped air passage having at least an upper end closed and open front and rear. Process. c) A plurality of the heat exchanger units manufactured in this manner are sequentially erected and arranged in parallel in the case, and the vertical ridges and valleys provided on the heat exchange partition plates of adjacent heat exchanger units are crossed with each other. A fluid flow passage that is substantially watertight on both sides is formed between the heat exchange partition plates of the adjacent heat exchanger units, and the liquid flow passage is formed between the upper edges of the heat exchange partition plates of the adjacent heat exchanger units. Forming a liquid inlet communicating with the passage, and connecting these heat exchanger units to each other so that they can be engaged with and separated from each other on the fluid flow-down passage forming surface. d) The liquid flow passage formed by interfitting or abutting the bulging portions distributed and bulged inside and outside of the heat exchange wall plate of the adjacent heat exchanger unit forming both side walls of the liquid flow passage. A slow-moving portion and an overflow channel formed adjacent to the slow-moving portion, wherein the slow-moving portion and the overflow channel are formed along at least one side edge of the heat exchange wall plate; A step of forming the circulating water overflowing from the slowly flowing down portion into the overflow channel so as to be able to flow freely into the overflow channel by partitioning each other by vertical concavo-convex strips which can be separated from each other. A method for manufacturing an indirect heat exchanger, comprising the above a) to d). (Method of Using the Invention) Next, a method of using the above-structured device manufactured according to the present invention will be described. The heat exchange action when this heat exchanger is incorporated in a cross-flow cooling tower is as follows. The circulating water flowing down from the upper water tank of the cooling tower flows into the plurality of fluid flow passages and flows down to the lower water tank. On the other hand, the air taken in from the outside air inlet flows in the plurality of air passages orthogonally to the flow of the circulating water, and during this passage, the circulating water is indirectly passed through the heat exchange partition plate, that is, in a non-contact manner. The air that has cooled and heated itself is exhausted to the outside through an exhaust port through the ventilation chamber. Due to prolonged use or the quality of the circulating water, dust and microorganisms adhere to the wall surfaces of the plurality of narrow fluid flowing passages in the plurality of narrow fluid flowing passages, thereby hindering the flow of the circulating water. If the clogging is moderately obstructed, one of the clogged fluid flow passages or the adjacent heat exchanger unit that separates all adjacent heat exchanger units from each other and forms the inner surface of the fluid flow passage. The uneven surface of the heat exchange partition plate of the exchanger unit is exposed to the outside, and the deposits adhering to the outer surface of the heat exchange partition plate, i.e., the uneven surface forming the fluid flow-down passage are partially washed with circulating water or washing water. Remove and clean. After cleaning the lower surface of the fluid flow in this way, the heat exchange partition plates of the adjacent heat exchanger units again engage with each other to form the original fluid flow passage without clogging again to operate the cooling tower. Start. Even if the slow flow portion in the fluid flow passage is clogged, a part of the circulating water overflowing from the slow flow portion flows into the overflow channel and flows toward the lower water tank. It does not flow back toward the supply port of the fluid flow-down passage and does not fly around the cooling tower. (Effect of the Invention) The product manufactured by the manufacturing method configured as described above can be used as described above, and the method for manufacturing an indirect heat exchanger of the present invention has the following effects. A predetermined number of heat exchange partition plates having the same shape and the same shape are vacuum formed from a single synthetic resin plate by a vacuum forming method, and the heat exchange partition plates are turned into a set of two to turn over each other. The bent upper end edges are connected to each other over the entire width and integrated to form a single heat exchanger unit, and the opposed inward bulging portions are abutted against each other, so that the two heat exchange units Since the middle portions of the partition plates are separated from each other and a step of forming one tunnel-shaped air passage having at least an upper end closed and open front and rear is adopted, the number of heat exchange partition plates required for heat exchange is adopted. Can be used for common mold processing, the structure and cost of the entire mold and molding machine can be reduced, and they can be stacked and placed one on top of the other without bulkiness, so that storage is not required. Also, by forming the heat exchange partition plates as a set of two and turning them upside down, the bent upper end edges are mutually connected and integrated over the entire width thereof to form a single heat exchanger unit. Only by arranging adjacently and in parallel, it is possible to manufacture an indirect heat exchanger having a desired heat exchange rate, and at the time of changing the heat exchange rate,
It can be easily handled by increasing or decreasing the number of heat exchanger units. In addition, the fluid flow-down passage is formed between the adjacent heat exchanger units, and the adjacent heat exchanger units are engaged with each other on the fluid flow-down passage forming surface.
Even if the dust and microorganisms adhere to the wall of the fluid flow passage and become clogged enough to impede the flow of circulating water, the heat exchanger units that are adjacent to each other To remove the connection of these heat exchanger units, and to expose and clean the uneven surface of the heat exchange partition plate of the adjacent heat exchanger unit which formed the inner surface of the fluid flow-down passage to the outside. Thus, clogging of the fluid flow-down passage can be easily eliminated. Further, by forming uneven strips over the entire height of both side edges of the heat exchange partition plate, a fluid flow passage meandering in the zigzag with the engagement of the uneven strips provided on the heat exchange partition plate of the adjacent heat exchanger unit. Can be easily molded in a closed state over the entire height. The downflow slow section and the overflow channel are separated from each other by vertical ridges which are formed along at least one side edge of the heat exchange partition plate and can be freely fitted and separated from each other, and the circulation overflows from the downflow slow section. By forming the water so that it can freely flow into the overflow channel, even if the slow flow portion of the fluid flow passage is clogged, a part of the circulating water that overflows from the slow flow portion is used as the overflow channel. A part of the circulating water can flow through the overflow channel toward the lower water tank, and a part of the circulating water overflows from the slowly flowing portion toward the fluid inlet of the fluid flowing-down passage. The indirect heat exchanger can be manufactured without causing backflow of the water and without causing a shortage in the amount of circulating water itself, and without scattering to the periphery of the cooling tower. Baffles distributed and bulged inside and outside the heat exchange partition plates of adjacent heat exchanger units forming both side walls of the fluid flow-down passage are mutually fitted and abutted to form a flow-down slow portion, and these flow-down slow portions are formed. And the overflow channel are a manufacturing method formed along at least one side edge of the heat exchange partition wall plate and separated from each other by vertical uneven strips that can be fitted and separated from each other, so that they are adjacent when the fluid flow-down passage is clogged. Manufacturing of an indirect heat exchanger that allows easy disassembly and cleaning of the slow flow section and overflow channel without damaging each heat exchanger unit by merely separating the heat exchanger units that separate from each other on the fluid flow passage formation surface it can. (Example) Next, a typical example of the present invention will be described. First Embodiment FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG.
FIG. 7 shows a flat air flow having a plurality of flat vertical fluid flow passages 10 (= 10 A) which are parallel to each other, and a vertical surface formed between each of the fluid flow passages 10. The cooling tower has a horizontal air passage 11 through which the two fluid passages 10 and 11 are separated by a heat exchange partition plate 12 made of a plurality of synthetic resin plates that make the mutual liquids non-contact. The heat exchanger A is manufactured in the following manner. First, a predetermined number of heat exchange partition plates 12 made of synthetic resin having the same shape and the same shape are vacuum formed from one synthetic resin plate by vacuum forming. At this time, a large number of bulging portions 13 are formed in the middle of each heat exchange partition plate 12 so as to protrude toward the same side, and furthermore, the uneven strips 15 in a vertical direction which can be engaged with each other along both sides of each heat exchange partition plate 12. And the upper edge 12a is bent to the same side as the bulging portion 13 in the same size and L-shape as the height of the bulging portion 13. The heat exchange partition plate 12 is turned into a set of two sheets, and the top and bottom sides are turned over, and the edges of the upper end 12a are joined and integrated with each other over the width thereof, and a single heat exchanger unit B is formed. The bulging portions 13 are abutted with each other, and the middle portions of the two heat exchange partition plates 12 are separated from each other to form one of the horizontal air passages 11 in a tunnel shape having a closed upper end and an open front and rear. . A plurality of the manufactured heat exchanger units B are made parallel to each other and stand up sequentially in the same case C, and the concave and convex strips 15 are put on each other between the heat exchange partition plates 12 of the adjacent heat exchanger units B so that both sides are overlapped. One side of the fluid flow-down passage 10 which is almost water-tight on the side, and a liquid inlet communicating with the fluid flow-down passage 10 between the upper end 12a of the heat exchange partition plate 12 of the adjacent heat exchanger unit B. 10a is formed, and the heat exchanger units B adjacent to each other on the fluid flow-down passage forming surface are engaged with each other and connected and separated so as to form the heat exchanger A (= A2). In the middle portion of the heat exchange partition plate 12, a large number of horizontal obstructing portions 14 swelling in and out are formed discontinuously and displaced from one another in a hierarchically distributed manner, and the heat of adjacent heat exchanger units B is formed. The fluid flow-down passage 10 is formed into a zigzag meandering channel by engaging and abutting the baffle portions 14 provided on the exchange partition plate 12. In the example shown in the drawing, the above-mentioned baffle portion 14 will be described in more detail. One of the heat exchange partition plates 12 constituting the fluid flow-down passage 10 has a shallow outwardly bulging portion inside the other heat exchange partition plate.
Fit the tops of the bulging parts that bulge deeply inward of 12, respectively,
In addition, the two heat exchange partition plates 12 are abutted with each other at the inwardly shallow bulging portion together with the heat exchange partition plates 12, and each of the obstruction portions 14 is formed. Thus, it serves as a spacer for forming the fluid flow-down passage 10. In the above embodiment, the distance between the fluid flow passages 10 provided between the two heat exchange partition plates 12 is 2 to 5 mm, preferably about 2 mm, and the thickness of these heat exchange partition plates 12 is
Use 0.2 to 0.4 mm. Further, the bulging portion 13 bulging into the air passage 11 is a hollow truncated cone 52 having an opening at the bottom 51, and the inner surface 53 is a vortex generating portion 54 of the flowing liquid in the fluid flowing passage 10. More specifically, among the horizontal obstacles 14 that are discontinuously shifted in position and swelled in a hierarchical manner, the swelling portions 13 are located between the obstacles 14 at least every two rows above and below, The zigzag fluid flow passage 10 formed by the 14 rows of baffles 14 and the 14 rows of upper and lower baffles 14 in which the bulges 13 are arranged as described above.
The entire bottom portion 51 of the hollow truncated cone 52 constituting the opening 13 is open, and the circulating water flowing in the fluid flow passage 10 formed in a hierarchy is from the obstruction portion 14 where the bulging portion 13 is arranged to the lower obstruction portion 14 When the water flows downward, it always flows into the hollow truncated cone 52, becomes a vortex, flows down toward the lower obstruction 14, then turns in the horizontal direction and flows along the obstruction 15 (FIG. 2, FIG. 3).
FIG. 4, FIG. 5, FIG. 5, FIG. A small projection (not shown) is formed on the top surface of one of the bulging portions 13 of the two heat exchange partition plates 12 of the heat exchanger unit B, which abuts each other. Forming a small recess (not shown) for receiving the projection on the top surface of the other bulging portion 13;
Assembled with these small projections and small depressions turned upside down.
The two heat exchange partition plates 12 are aligned. In addition, in order to secure the engagement between the concave and convex strips 15 as necessary, a notch that can be hooked and detachable on a part of the concave and convex strips 15 or a fastener is inserted into the concave and convex strips 15 when used. There is also. The fluid flow-down passage 10A is connected to the heat exchange partition plate 12 of the adjacent heat exchanger unit B forming both side walls of the fluid flow-down passage 10A.
A flow-down slow portion E formed by fitting and abutting the baffles 14 distributed and bulging inside and outside of the inside and an overflow channel F formed adjacent to the flow-down slow portion E are formed. Hayabusa E
And the overflow channel F are separated from each other by longitudinally uneven ribs 19 formed along both sides of the heat exchange partition plate 12 and capable of being fitted to and separated from each other. The process of forming the heat exchanger into the inside is added to obtain an indirect heat exchanger A2. Further, the concave and convex strips 19 extend vertically from the lower end of the heat exchange partition plate 12 to just before the upper end thereof, and the upper end of the concave and convex strips 19 and the closed upper end of the heat exchange unit B form the inlet G of the flood channel F. The both sides of the overflow channel F are formed in a sealed state by the concave and convex strips 15 and 19. (How to use the embodiment) The operation of the indirect heat exchanger A2 manufactured by the manufacturing method of the above embodiment will be described below together with the method of assembling into the cross-flow cooling tower R2 and the method of using the same. When incorporating this heat exchanger A2 into the main body 40 of the cooling tower R2, a plurality of the heat exchanger units B are arranged adjacent to each other in a single case C, and the adjacent heat exchanger units B Before the heat exchange partition plates 12 are engaged with each other and connected to each other, the fluid flow-down passage 10 is formed between the adjacent heat exchanger units B, and after assembling to the heat exchanger A2 exhibiting a desired heat exchange rate, The case C of the heat exchanger A2 is disposed below the upper water tank 41 of the cooling tower R2, and the upper supply ports of the plurality of fluid flow-down passages 10 are connected to the upper water tank.
41 is opened toward the bottom surface, and the discharge port is opened to the lower water tank 42 side, and the primary sides of the plurality of air passages 11 face the outside air intake provided in the main body 40 of the cooling tower R2. The secondary side is opened to a ventilation room communicating with the exhaust port 44, and this heat exchanger A2 is incorporated into the main body 20 of the crossflow cooling tower R2 (see FIG. 8). Further, in each of the air passages 11, a sprinkler H
Of water sprinkling pipes P are piped horizontally. The heat exchange action of the heat exchanger A2 thus incorporated is as follows. The circulating water flowing down from the upper water tank 21 flows into the plurality of fluid flow passages 10 and flows down to the lower water tank 22. The plurality of bulging portions 13 provided in the fluid flowing-down passage 10 while flowing into the bulging portion 13 communicating with the zigzag flow path during the downflow.
The flowing liquid that is circulating water at the position becomes a vortex and swells
After the primary stagnation in the inside 13, the swelling portion 13 flows out again into the zigzag flow path in the lower stage. The circulating water slowly flows down while repeating such a flow, and the lower tank
It flows to 22. On the other hand, the air taken in from the outside air inlet flows in the plurality of air passages 11 at right angles to the flow of the circulating water, and at the bulging portion 13 bulging into the air passages 11 when passing through the air passages. The circulating water flows toward the ventilation chamber of the cooling tower R while drifting along the outer peripheral surface of the outlet 13, and during this passage, the circulating water is cooled indirectly via the heat exchange partition plate 12, that is, in a non-contact manner, and the temperature of the circulating water rises. The air is exhausted to the outside from the exhaust port through the ventilation chamber. Due to prolonged use or the quality of the circulating water, dust and microorganisms adhere to the wall surfaces of the plurality of narrow fluid flowing passages 10 of the plurality of narrow fluid flowing passages 10 and obstruct the flow of the circulating water. If the clogging is too much, at the position of the clogged fluid downflow passage 10 or all the adjacent heat exchanger units B are separated from each other,
By exposing the uneven surface of the heat exchange partition plate 12 of the adjacent heat exchanger unit B forming the inner surface of the fluid flow-down passage 10 to the outside, the outer surface of the heat exchange partition plate 12, that is, the fluid flow-down passage
Deposits adhering to the uneven surface forming 10 are removed with a part of circulating water or washing water and cleaned. After cleaning the lower surface of the liquid flow in this way, the heat exchange partition plates 12 of the adjacent heat exchanger units B are again engaged with each other to form the original fluid flow passage 10 again to operate the cooling tower R2. Start. Even if the slow flow portion E in the fluid flow passage 10 is clogged, a part of the circulating water overflowing from the slow flow portion E flows into the overflow channel F and is directed toward the lower water tank. Flowing down the overflow channel F, the fluid flow passage 10
Does not flow back toward the supply port of the cooling tower R2 and does not fly around the cooling tower R2. Further, an air passage extends from the sprinkler pipe P in the sprinkler H.
Even between the high-temperature circulating water sprinkled in the air 11 and the air flow flowing in the air passage 11, direct heat exchange is promoted to cool the high-temperature circulating water. (Effects Specific to Embodiment) In the manufacturing method of the embodiment, the bulging portion 13 bulging into the air passage 11 is a hollow truncated cone 52 whose inner surface is open to the fluid flow-down passage 10, and the inner surface 53 is Vortex generation part of flowing liquid in fluid flowing passage 11
After flowing into the bulging portion 13 communicating with the zigzag flow path and flowing down on the inner surface 53 of the plurality of bulging portions 13 provided in the fluid flow-down passage 10, the flowing liquid becomes a vortex and temporarily stays inside the bulging 50. By forming a structure that flows out of the bulging portion 13 into the lower zigzag flow path, the flow speed of the circulating water in the fluid flow-down passage 10 can be sufficiently reduced, and the air flowing through the air passage 11 An indirect heat exchanger A2 can be manufactured in which the indirect contact time with the flow can be sufficiently long and the circulating water can be cooled to a predetermined temperature without changing the absolute temperature of the air. In addition, the two heat exchange partition plates 12
The intermediate portions are separated from each other to form a horizontal air passage 11, so that when passing through the air passage 11, the bulge 52 bulges into the air passage 11 and drifts along the outer peripheral surface of the bulge 52. While flowing into the ventilation chamber 25 of the cooling tower R,
A part of the circulating water that has become a vortex inside the bulging part 13 and temporarily stays can be indirectly contacted with a sufficient amount of air for a long time through the wall of the hollow truncated cone 52 of the bulging part 13, An indirect heat exchanger A that can sufficiently cool at each bulging position can be manufactured. Bulges 13 that abut each other and form air passages 11
Can function as a lateral rib of the adjacent heat exchange unit B to manufacture the indirect heat exchanger A2 with improved buckling. This heat exchange partition plate 12 is formed to form the fluid flow passage 10.
In the middle part of, a horizontal obstructing part 14 swelling in and out is formed discontinuously, displaced in position and distributed many in a hierarchy,
The obstruction portions 14 provided on the heat exchange partition plate 12 of the adjacent heat exchanger unit B can be easily formed into a zigzag meandering flow path by hooking or fitting and butting. Indirect heat exchanger A2 can be manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 relates to the present invention, FIG. 1 is a partially omitted front view of a heat exchanger according to an embodiment of the present invention, and FIGS.
FIG. 7 is a partially omitted vertical sectional view showing the butted state of adjacent heat exchange units in FIG. 7, FIG. 7 is a partially omitted bottom view of FIG.
FIG. 8 is a schematic diagram showing an example of use of the heat exchanger of FIG. Main symbols A (= A2) in the drawing: heat exchanger for cooling tower, 10 (= 10A): liquid downflow passage, 11: air passage, 12: heat exchange partition plate, B: heat exchange Unit.

Claims (1)

(57) [Claims] There are several flat vertical liquid flow passages parallel to each other, and a flat air passage with a vertical surface formed between each of these liquid flow passages, and a horizontal air passage through which the air flow flows. The method of manufacturing an indirect heat exchanger, wherein the two fluid passages are separated by a heat exchange partition plate made of a plurality of synthetic resin plates that make the fluids not contact with each other. Vacuum-forming each synthetic resin heat exchange partition plate of the same shape from one synthetic resin plate, and protrudingly molding a large number of bulging portions to the same side in the middle of each heat exchange partition plate, and further forming each partition Along the sides of the plate are formed longitudinally uneven strips which can be engaged with each other, and the upper edge is bent to the same size as the height of the bulging portion and to the same side as the bulging portion in an L-shape. Process. b) The heat exchange partition plates are formed as a pair, and the top and bottom edges formed by inverting each other are connected to each other over their entire width and integrated to form a single heat exchanger unit. The opposed inwardly projecting portions are abutted to each other, and the intermediate portions of the two heat exchange partition plates are separated from each other to form one tunnel-shaped air passage having at least an upper end closed and open front and rear. Process. c) A plurality of the heat exchanger units manufactured in this manner are sequentially erected and arranged in parallel in the case, and the vertical ridges and valleys provided on the heat exchange partition plates of adjacent heat exchanger units are crossed with each other. A fluid flow passage that is substantially watertight on both sides is formed between the heat exchange partition plates of the adjacent heat exchanger units, and the liquid flow passage is formed between the upper edges of the heat exchange partition plates of the adjacent heat exchanger units. Forming a liquid inlet communicating with the passage, and connecting these heat exchanger units to each other so that they can be engaged with and separated from each other on the fluid flow-down passage forming surface. d) Flow-down formed by interfitting or abutting the liquid flow-down passage with bulging portions distributed and bulging inside and outside the heat exchange partition plates of adjacent heat exchanger units forming both side walls of the liquid flow-down passage. Formed by a slow portion and an overflow channel formed adjacent to the falling slow portion, and the interfitting formed by forming the slow flowing portion and the overflow channel along at least one side edge of the heat exchange partition plate. A step of forming a circulating water overflowing from a slowly flowing down portion into a flood channel so that the circulating water can freely flow down into the overflow channel by being separated from each other by vertical concavo-convex strips which can be separated from each other. A method for producing an indirect heat exchanger, comprising the above a) to d).