JPS60117089A - Manufacture of heat exchanger - Google Patents

Abstract

PURPOSE:To eliminate the needs for the sealing treatment of pipe ends and the anti- oxidizing measure of the inside surface of heat transfer pipes and consequently strikingly reduce the manufacturing cost by a method wherein heat conducting agent is sealingly poured in gaps formed between heat transfer pipes adjacent to each other by thermally shrinking a heat-shrinkable tube. CONSTITUTION:A heat exchanger 1' is formed in a cylindrical shape with double-start winding, in which the partition walls 2a and 3a of opposedly contacting heat transfer pipes 2 and 3 belonging to two systems successively and alternately neighbor with each other. Heat conducting agent 6' is applied onto the outer peripheral surface of the heat exchanger 1'. After the application work of the agent 6', a tubular heat-shrinkable tube 7' is put onto the outer periphery of the heat exchanger 1'. After that, the heat- shrinkable tube is thermally shrunken by heated air or the like so far that the heat- shrinkable tube is brought into tightly contact with the heat transfer pipes 2 and 3 and consequently the heat conducting agent 6' applied onto the outer peripheral part of the heat exchanger 1' is surely pushed inwards in gaps 4 so as to complete the sealing of the gaps 4. Accordingly, the heat transfer performance of the heat exchanger is ensured. Because the heat conducting agent is applied after the heat transfer pipes 2 and 3 are worked in the cylindrical shape with double-start winding, no adhesion of the heat conducting agent to the facilities for double-start winding work occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a heat exchanger having two fluid passages.

Conventional Structure and Problems There is a heat exchanger 1 that exchanges heat through double partition walls, as shown in FIG. 1, as one of the heat exchangers having two systems of fluid passages. This transfers fluids A and B to heat transfer tube 2 and heat transfer tube 3.
The heat is exchanged through the two partition walls 2a and 3a. When heating potable hot water with a heat medium, this heat exchanger can detect abnormalities in advance and prevent the heat medium from getting mixed into the water even if a hole is formed in the pipe wall due to corrosion of the heat transfer tube. Therefore, it is very effective in terms of water quality assurance.

For the heat transfer performance of this heat exchanger, it is necessary that the partition walls 2a and 3a are in close thermal contact with each other, and for this reason, the partition walls 2a and 3a are required to be in close thermal contact with each other.
Solder 5 was sealed in the gap 4 between a and 3a by dipping to ensure heat transfer performance.

However, in this conventional example, when tinoping the solder 5, it is necessary to perform Murayama treatment on the end of the tube to prevent the solder from flowing into the inside of the heat transfer tube 2. Due to the occurrence of an oxide film on the inner surface of the p4++2°3, inert scum had to be sealed in the front, which required a large number of man-hours in manufacturing and caused loss of production.

Purpose of the Invention The present invention eliminates the conventional bank dipping described in 2.
L. The purpose is to provide a manufacturing method in which the method of enclosing a thermal conductive agent is simple, and to reduce manufacturing costs while ensuring heat transfer performance.

Composition of the Invention The present invention C has two systems of heat exchanger tubes facing each other, and is formed into a double-wound cylindrical shape so that the heat exchanger tubes are successively and alternately adjacent to each other.
A heat conductive agent is applied to the outside of this cylindrical shape, and a heat shrinkable tube provided on the outer periphery is heat-shrinked to seal the heat conductive agent into the gap between adjacent heat exchanger tubes. It is something to lean on.

According to this manufacturing method, the heat-shrinkable tubes adhere evenly to the outer periphery 1ni of the heat exchanger during heat-shrinking, so that the heat-conducting agent applied to the outer periphery is reliably and reliably sealed in the gaps between the heat-transfer tubes.
Moreover, since the enclosing operation becomes very easy, the manufacturing cost can be reduced by a large amount.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 3, 4, and 5. Note that the same parts as in the conventional example are listed in the same month, and the explanation is omitted.

In FIGS. 3 and 5, 6 is a heat conductive agent sealed in the gap 4, and 7 is a heat-shrinkable tube provided on the outer peripheral surface of the heat exchanger 1' after being heat-shrinked. FIG. 4 shows the state before heat shrinkage and sealing work, where 6' is a heat conductive agent applied to the outer periphery of the heat exchanger 1', and D is a heat shrink tube before heat shrinkage.

Next, a method for manufacturing a heat exchanger according to the present invention will be explained.

First, the heat exchanger 1' is formed into a double-wound cylindrical shape in which the two systems of heat transfer tubes 2 and 3 are brought into contact with each other and the partition walls 2a and 3a of the heat transfer tubes 2 and 3 are adjacent to each other. Then heat exchanger 1'
The heat conductive agent 6' is applied to the outer peripheral surface of the cylinder using a spatula, a can, etc., and this work can be easily performed since it is applied to the cylindrical outer peripheral surface. After the coating work, use a cylindrical heat shrinkable chip 3-77'.
cover the outer periphery of the heat exchanger 1'. After that, the heat-shrinkable tube is heated and shrunk with hot air until it comes into close contact with the heat transfer tubes 2 and 3, and the thermal conductive agent 6' applied to the outer periphery is firmly pushed inward into the gap 4 to complete the sealing. . Therefore, the heat transfer performance of the heat exchanger can be ensured.

Furthermore, in this method, the heat conductive agent is coated after the heat transfer tubes 2 and 3 are wound in two cylindrical shapes, so that the thermal conductive agent does not arrive at the double-thread wrapping equipment. Therefore, any type of thermal conductive agent can be used, such as a non-curing type, a heat-curing type, or a two-component time-curing type consisting of a main agent and a curing agent.

Furthermore, since the outer peripheral surface is covered with a heat shrinkable tube, the heat conductive agent does not get on hands or equipment in the subsequent process, and handling efficiency is greatly improved.

Effects of the Invention As described above, the method for manufacturing a heat exchanger of the present invention involves forming two lines of heat exchanger tubes in a double-wound cylindrical shape such that the heat exchanger tubes are adjacent to each other in sequence, and the outer surface of the heat exchanger is In order to seal the heat conductive agent into the gap between adjacent heat transfer tubes by applying a heat transfer agent to the tube and heat-shrinking the heat shrink tube provided on the outer periphery of the tube, (1) Ensure that the heat transfer agent is sealed into the gap between the heat transfer tubes. Because you can
Heat transfer performance can be ensured.

(2) It is easy to apply the thermal conductive agent and seal it into the gap, and manufacturing costs can be reduced.

(3) There are few restrictions on the selection of thermal conductive agents, so thermal conductive agents can be used depending on the application.

(71) Since the heat conductive agent is covered with a heat shrinkable tube, the handling efficiency in the subsequent process is greatly improved.

(5) Since the Hunter Dippinog can be discarded, there is no need for tube end injection treatment or oxidation prevention measures on the inner surface of the heat transfer tube, and the manufacturing cost is significantly reduced.

The effects are great.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing a conventional example of a heat exchanger, Fig. 2 is a partial enlarged view of section X-X in Fig. 1, and Fig. 3 is a cross section of a heat exchanger showing an embodiment of the present invention. 4 is a sectional view showing an intermediate step in the method of the present invention, and FIG. 5 is an enlarged sectional view of FIG. 3. 1.1'... Heat exchanger, 2, 3... Heat exchanger tube, 2a. 3a...Partition wall, 4...Gap, 6.6'
...Thermal conductive agent, 7.7' ...Heat shrink tube. Name of agent: Patent attorney Toshio Nakao (1st person)
figure? Figure 2 Figure 3 Figure 1' Figure 5

Claims (1)

[Claims] Two systems of heat exchanger tubes are placed in opposition to each other, and the heat exchanger tubes are formed into a double-wound cylindrical shape so that they are adjacent to each other alternately.The outer surface of this cylindrical shape is coated with a heat conductive agent, and a heat shrink tube is provided around the outer periphery. A method for producing a heat exchanger, which comprises heat-shrinking the heat-conducting agent and sealing the heat-conducting agent into the gap between adjacent heat exchanger tubes.