JPS59164896A - Needle fin type heat exchanger and manufacturing thereof - Google Patents

Abstract

PURPOSE:To form needle fins having a high quality hydrophilic coating with an improved reliability and reduced cost by wrapping needle fins around a metal pipe, and baking an inorganic high polymer silicic colloid on it after it is glued with a thermosetting plastic adhesive. CONSTITUTION:In a process A, needle fins 2 are wrapped around a copper pipe 1, and it is glued with a thermosetting plastic adhesive 3. The following process of baking and drying process is divided into a preliminary process Fa and a main process Fb. Those which are applied with a hydrophilic treatment is processed in hydrophilic treatment processes G-K which is branched from the preliminary process Fa to the main process Fb. Those which are not applied with a hydrophilic treatment are baked and dried without it. A treatment agent having a high polymer silicic colloid as a primary constituent is used for a coating treatment agent. Therefore, it is stable against over-baking, and improves the capability of the coating regarding hydrophilic property and corrosion resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a heat exchanger for use in fertilization equipment, in which needle-like fins made from thin aluminum sheets are wrapped around the outer circumference of copper pipes using thermosetting resin such as phenol or epoxy. The present invention relates to a process in which a hydrophilic film is applied during the manufacturing process to a needle-like fin type heat exchanger that is fixed with a system adhesive.

As shown in Figure 1, the needle-fin type heat exchanger is
A heat exchanger is formed by wrapping a needle-like fin 2, which is made by processing a thin aluminum plate into a substantially U-shape and dividing the tip into a needle-shape, around the outer periphery of a copper pipe 1, and fixing it with a thermosetting resin adhesive 3. The pipe was bent into a corrugated shape as shown in Figure 2, and assembled into an aluminum channel/L/4 by heating and fixing, and then the adhesive 3 around the pipe 1 was baked and hardened. Ru.

Conventionally, in this type of heat exchanger, the needle fins 2 are provided with water wettability and rust prevention properties in order to properly drain the moisture that collects between the needle fins 2 and prevent the surface heat transfer from being inhibited. In order to obtain a hydrophilic coating, the needle-like fins 2 are immersed in water gelatin, coated, and then baked, and acrylic or other polymer resin is dipped and baked. There is no disclosure of a method for obtaining a hydrophilic coating (hereinafter simply referred to as hydrophilic treatment) in conjunction with the manufacturing process of a fin-type heat exchanger.

The previously considered hydrophilic treatment method described above has not been disclosed as a practical example of its use in mass production. There are no detailed examples of efficient combinations of the manufacturing process of the heat exchanger body and the hydrophilic treatment process.
Depending on the method of treatment, if the adhesive 3 is subjected to hydrophilic treatment in an uncured state, the fixation of the fins 2 may become loose and the rust prevention function may be impaired. For this reason, when curing the adhesive 3 and curing the film treatment agent twice, there is a problem that equipment and thermal energy are wasted.

Furthermore, the hydrophilic film No. 1 has the problem of being susceptible to problems such as peeling, lifting, and falling off of the bulges.

Note that some needle fin type heat exchangers do not require a hydrophilic film to be applied to the needle fins 2, depending on their size and shape, but they may not be used in conventional hydrophilic treatment. The drying temperature for baked water glass, etc. is different from that of thermosetting resin adhesive 3, so on the same line,
There is a restriction that it is not possible to produce products that undergo hydrophilic treatment and products that do not, which is a constraint in simplifying the equipment and saving thermal energy.

The present invention was made in view of the above problems, and an object thereof is to provide a needle-fin type heat exchanger having a high-quality hydrophilic film, and to provide an efficient manufacturing method thereof. That is.

Therefore, in the conventional heat exchanger manufacturing process, the drying process is divided into a preliminary process and a main process, and this baking bypasses the hydrophilic treatment process for the drying process. The first main focus is on the connection between A needle-like fin type heat exchanger that produces a synergistic effect through the combination and forms a thin, highly dense hydrophilic film on the fins without losing the adhesive effect of the thermosetting resin adhesive. The present invention provides a container and a method for manufacturing the same.

Hereinafter, embodiments showing this research in figures will be described. Third
In the figure, the steps A-F surrounded by dotted lines are conventional steps, and step A is the process of winding the needle-like fins 2 around the copper pipe L and fixing them with the adhesive 3. Step B is the bending step in which the heat exchange pipe obtained in Step A and wound around the drum is bent into a corrugated shape. Step C is assembling the corrugated heat exchange pipe into the aluminum channel 4. Step D is a step of inspecting the pipe 1 for leakage, Step E is a step of cleaning the inner surface of the pipe 1, and Step F is a step of baking and drying the adhesive 3. Steps G~ surrounded by solid lines are hydrophilic treatment steps, C step is a step of degreasing and cleaning the needle fins 2, H step is a step of washing with water and hot water, Step 2 is a draining step, J The process is a process of immersing the needle-like fin 2 in a chemical for film treatment and painting it, and a K process is a process of draining off the excess chemical. In FIG. 3, dotted arrows indicate the flow of products that are not subjected to hydrophilic treatment (heat exchangers), and solid arrows indicate the flow of products that are subjected to this treatment.

Conventional baking involves a drying process F, a preliminary process F, a main process F,
Products that undergo hydrophilic treatment are treated with step 0-K, which is a bypass hydrophilic treatment for preliminary process FA and main process F, while products that are not subjected to hydrophilic treatment are baked and dried as they are. Ru.

FIG. 4 shows the configuration of a manufacturing apparatus according to an embodiment of the present invention, in which the heat exchanger that has undergone step E (inner surface cleaning step) is passed through a drying oven 5a for the preliminary drying step F. Those that are not subjected to hydrophilic treatment are sorted by apparatus N, and then sent to a drying oven 5b and subjected to the main step F4. The material to be subjected to hydrophilic treatment is passed through a 7-karat carpet unit in a drying oven 5a, and then transferred to an elevator-type conveyor M in a hydrophilic treatment line.
A series of hydrophilic treatment steps 0 to K are carried out by this conveyor M, and then the material is passed through a drying oven 5b to carry out the main drying step F for baking.

In the manufacturing method (processing method) of the present invention having the above configuration,
Items with and without hydrophilic treatment are on the same line. This allows for efficient processing on the top. For this purpose, the film treatment agent must have the same drying temperature as the adhesive 3 for fixing the fins 2 and be stable against excessive baking, and to shorten the process and simplify the equipment. It is possible for some water to be brought in from the washing process, has low viscosity and good liquid drainage, does not require a setting process before drying, is non-polluting, and has good storage stability. Taking into consideration the condition that the film is good, and also that the film has sufficient functionality in terms of water resistance and rust prevention, we developed an inorganic film treatment agent containing polymer 6-Ij 1 & 2 colloids as its main component. was selected.

Phenol/epoxy resin adhesive 3 is used as a degreasing agent.
Use an inorganic coating treatment agent for thin plate aluminum, not a solvent degreaser such as Triclean, which has a strong dissolving power, but a solvent degreaser that has a weak dissolving power for Adhesive 3. 7, the feet for adhering to the fins 2 should be formed, and the treated film should not stick due to the amount of oil attached, etc.
Based on the conditions, a non-etching weak alkaline detergent (surfactant) for aluminum was selected. Furthermore, it was confirmed that no problems would occur if the adhesive 3 was hardened to such an extent that the baking was performed in the preliminary drying step F1 before entering the hydrophilic treatment steps G to K. Film 41JI used in Examples of the present invention! The composition of the filler is shown in Table 1.Furthermore, even if a hydrophilic treatment process is performed in the drying process, the same length of baking as in the past will occur in the drying process, in the baking drying preliminary process FA and in the main process. When the formula was carried out, it was confirmed that both Adhesive 3 and Monohydrophilic Film Treatment Agent A were sufficiently cured.

In the above example, the process arrangement as shown in Figure 3 was adopted because it was necessary to produce products that were treated with a hydrophilic film and products that were not treated with a hydrophilic film on the same production line (processing line). In the case of a line for producing products subject to sexual treatment, the steps shown in FIG. 5 are used to save thermal energy in the baking drying ovens 5a, 51) iC. 1. Immediately after completing the fin wrapping process (A process), the bending process (B process), and the assembly process that involves heating (C process), baking is performed immediately after the preliminary drying process F1. Leakage inspection step 0, and internal cleaning # (equalization step b)
Further, a hydrophilic film treatment step G-K is performed, and a drying preliminary step 9 is performed for baking. Regarding the conveyance equipment used in the configuration shown in Figure 4, it is possible to use an overhead trolley conveyor, a mole rail type hoist crane, etc., depending on the amount of production and the shape of the flowing wire. Needless to say.

As described above, in the present invention, baking in the needle fin type heat exchanger manufacturing process divides the drying culm into two, and a hydrophilic skin Il! Since the IIT treatment process is arranged, it is not necessary to increase the drying time for baking due to hydrophilic treatment, and the effect is that thermal energy can be saved and the drying device can be used in the same furnace body. There is. In addition, it is possible to efficiently separate items that are subjected to hydrophilic treatment and items that are not subjected to hydrophilic treatment in the drying oven. Furthermore, by selecting a weak alkaline cleaning agent as the cleaning agent and selecting a water-soluble inorganic coating treatment agent as the coating treatment agent, there is no need for a liquid drainer or ceratin time, making the process extremely simple. It has the effect of being able to be simplified and shortened, and can be easily unmanned through automation.
It also has the effect of saving on the use of chemicals and eliminating the significant increase in cost due to hydrophilic treatment. In addition, this combination of drugs has many excellent effects, such as greatly improving the reliability of the hydrophilic film.

[Brief explanation of the drawing]

1 and 2 are a sectional view and a front view showing a heat exchange pipe and an assembled appearance of a conventionally known needle-fin type heat exchanger, and FIG. 3 shows an embodiment of the manufacturing method according to the present invention. FIG. 4 is a plan view showing a configuration example of an apparatus for carrying out the manufacturing method of the present invention, and FIG. 5 is a process diagram showing another example of the manufacturing method of the present invention. 1... Copper pipe, 2... Needle fin, 3... Adhesive. F... Baking is a drying process, FA... Preliminary process I FR
...Main process, G-K...Hydrophilic film treatment process, G.
- Degreasing cleaning process, J... dipping painting process. Representative Patent Attorney Yusaku Goto Dashi 2

Claims (1)

[Scope of Claims] (1) A needle-like fin that is wound around a metal bi-7" and fixed with a thermosetting resin without adhesive, and an inorganic polymeric silicate colloid is baked onto the needle-like fin. Fin type heat exchanger. (2) The needle-like fin type heat exchanger according to item 1, wherein the metal pipe is a copper pipe, and the needle-like fins are formed by processing thin plate aluminum. ( 3) The needle-like fins wound around a metal pipe and fixed with a thermosetting resin adhesive are coated with a first film treatment agent whose main component is a mildly alkaline detergent and an inorganic polymer silicic acid. A method for producing an acicular fin type heat exchanger, which is characterized by immersing the heat exchanger in a second film treatment agent containing colo and id as main components, and baking and drying the heat exchanger. (4) 1g1l first film treatment The agent is a surfactant.
4. The manufacturing method according to claim 3, wherein the balance by weight of O is water, and the second film treatment agent contains 32 to 34 weight% of polymeric silicic acid colloid and silicate, the balance being water. - (5) In a method for manufacturing a needle fin type heat exchanger, in which needle fins are wrapped around a metal pipe 7, a thermosetting resin adhesive is applied between the pipe and the fins, and baking is dried. The baking and drying process is divided into a preliminary baking and drying process and a main baking and drying process, and after the completion of the preliminary process, a degreasing and cleaning process is performed, and a film with rust prevention properties and good wettability is applied to the water. A method for manufacturing a needle-fin type heat exchanger, characterized in that a film treatment step is performed, and then the main step is performed. (6) K for the degreasing and cleaning process and the film treatment process;
A first film treatment agent whose main component is a weak alkaline detergent, and a second film treatment agent whose main component is an inorganic polymeric silicic acid colloid.
A fifth item characterized in that it is used in combination with a film treatment agent of
Manufacturing method described in section. (7) The first film treatment agent contains 10% by weight of a surfactant.
7. The manufacturing method according to item 6, wherein the balance is water, and the second film treatment agent contains 32 to 34% by weight of polymeric silicic acid colloid and silicate, and the balance is water.