JPS643987Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a heat exchanger equipped with pipes, which is characterized by having a mesh material protruding from the inside of the heat exchanger pipes and brazed to the inside of the pipes. This is related.

Conventional heat exchangers with pipes have the disadvantage that the heat transfer performance of the heat exchanger is not very good because the pipes are tubular. As described in Publication No. 51-94061, in which a wound metal mesh is inserted into the cooling/heating tube and multi-hole stopper plates are fitted to the front and rear ends of the tube, the metal net is not brazed, so it is partially attached to the cooling/heating tube. There is a disadvantage that the heat transfer performance of the heat exchanger is not very good because the metal mesh floats up or separates, and the unbrazed metal mesh inside the cooling and heating tubes rotates and vibrates due to the fluid moving inside the tubes. However, if the heating and cooling pipe meanderes or branches, it is extremely difficult to insert the wound metal mesh into the pipe.

In view of the above-mentioned drawbacks of conventional heat exchangers, this idea improves the heat transfer performance of the heat exchanger by brazing a mesh in a protruding manner on the inside of the pipe line of the heat exchanger. The purpose is to

In the heat exchanger of this invention, a conduit forming plate having a conduit section is used as at least one plate body, two plates are brazed together, and a mesh is attached to the inner wall of the formed heat exchange conduit. As a result of various tests on the conditions under which the brazing material could be brazed so as to protrude, it was found that the thickness of the raw material for the mesh was made larger than the predetermined thickness of the brazing material provided on the inner wall of the pipe, and that It has been found that it is necessary to make the length of the shorter diagonal line at least twice the predetermined thickness of the brazing material.

By brazing this net-like material so as to protrude from the inner wall of the pipe line of the heat exchanger, the heat transfer performance of fluids such as gases and liquids passing through the pipe line of the heat exchanger can be improved. The heat transfer performance can be improved by making the mesh size of the mesh as small as possible within the range that satisfies the following conditions and providing more protrusions on the inner wall of the pipe line of the heat exchanger.

As shown in FIG. 8, the mesh used in the heat exchanger of this invention is a thin metal plate 28 with a thickness of 0.3 mm, with a number of horizontal cut lines 29 provided at predetermined intervals. It is best to use so-called lath metal (expanded metal net) that is stretched vertically to form a net, lath-shaped plastic (expanded plastic net) that is similarly processed from plastic, or net woven with metal wire or plastic wire.

Next, examples of the heat exchanger of this invention will be described.

Example 1 Pipe sections 2 having a height of about 5 mm and a width of about 12 mm are provided in a meandering manner on a thin conduit forming plate 1 made of aluminum alloy and having a thickness of about 1 mm so as to protrude upward at regular intervals.

A brazing material 4 with a thickness of about 0.2 mm is provided on the upper surface of a thin substrate 3 made of aluminum alloy with a thickness of about 1 mm, and when the pipe forming plate 1 is placed on this substrate 3, the pipes of the pipe forming plate 1 are formed. A lath metal 5 made of a net-like aluminum alloy thin plate with a thickness of about 0.3 mm is provided on the substrate 1 at a location corresponding to the section 2 in a meandering manner in the same manner as the conduit section 2, and the substrate 3 and the conduit forming plate 1 are soldered together. A conduit 6 formed by the substrate 3 and the conduit forming plate 1
This is a heat exchanger 7 formed by brazing a net-like lath metal 5 to the bottom inner wall of the heat exchanger 7.

For comparison, we conducted an experiment on the thermal conductivity of the heat exchanger 7 of Example 1 and a conventional heat exchanger, which differs only by not providing a mesh on the inner wall of the pipe, as shown in Figure 3. It was hot.

From the experimental results shown in FIG. 3, it can be seen that the heat exchanger 7 of Example 1 has better heat transfer performance than the conventional heat exchanger.

Example 2 A brazing material 14 is provided to a thickness of about 0.2 mm on one side of a thin pipe forming plate 11 made of aluminum alloy and about 1 mm thick.
The conduit forming plate 11 is placed with the side where the brazing material 14 is located facing down, and conduit portions 12 having a height of about 5 mm and a width of about 12 mm are provided in a meandering manner so as to protrude upward at regular intervals.

Thin substrate 13 of aluminum alloy with a thickness of about 1 mm
A conduit forming plate 11 is placed on top of the conduit forming plate 11, and a lath-shaped plastic 1 is made of a net-like plastic thin plate with a thickness of about 0.3 mm inside the conduit section 12 of the conduit forming plate 11.
5 is provided, and the conduit forming plate 11 and the substrate 13 are brazed together, and a lath-shaped plastic 15 of a net-like material is brazed to the inner wall of the upper surface of the conduit 16 formed by the conduit forming plate 11 and the substrate 13. This is a heat exchanger 17 made of.

In addition, when brazing to fabricate the heat exchanger 17 of this second embodiment, it is better to turn the one shown in FIG. Easy to perform brazing work.

Example 3 A brazing material 24 with a thickness of about 0.2 mm is provided on one side of a thin pipe forming plate 21 made of aluminum alloy and having a thickness of about 1 mm. Using two of these pipe forming plates 21, the brazing material 24
2.5 mm in height and 12 mm in width are meanderingly formed on the upper conduit forming plate 21 so that the sides on which they exist face each other, and protrude upward at regular intervals. Provided with a lower conduit forming plate 21
In addition, a conduit section 22 with a height of about 2.5 mm and a width of about 12 mm is meandered so as to protrude downward at a certain interval in almost the same shape as the conduit section 22 provided on the upper conduit forming plate 21. establish.

A lath metal 25 is provided inside the conduit section 22 of the lower conduit forming plate 21, and the two conduit forming plates 21, 2
1 are brazed to each other, and a lath metal 25 of a net-like material is brazed to the inner wall of the bottom surface of a conduit 26 formed by two conduit forming plates 21, 21.

In addition, in each of the embodiments, the mesh material was provided on the horizontal inner wall of the conduit.
The mesh may be provided on the vertical inner wall of the conduit, and the conduit may have an arcuate cross-section rather than a rectangular cross-section.

In the heat exchanger of this invention, the net-like material is protruded from the inner wall of the heat exchanger's pipes and brazed to the inner wall of the heat exchanger, so that the mesh-like material closely adheres to the inner wall of the pipe line and does not float up. The heat transfer performance of the vessel can be improved, and the brazed mesh will not rotate or vibrate due to the fluid moving inside the pipe.
In addition, since the heat exchanger can be made by simply brazing a mesh material to the inner wall of the pipe, it is possible to easily braze the mesh material to the inner wall of the heat exchanger pipe. Heat exchangers of the same quality can be easily produced in large quantities.

[Brief explanation of drawings]

Fig. 1 is a plan view of the product of the present invention, Fig. 2 is an enlarged sectional view, Fig. 3 is a performance test diagram, Fig. 4 is an enlarged sectional view of another embodiment, and Fig. 5 is an enlarged sectional view of yet another embodiment. 6 is an enlarged plan view of the lath metal, FIG. 7 is a front view thereof, and FIG. 8 is an enlarged plan view of the lath metal before processing. 1 is a pipe forming plate, 2 is a pipe section, 3 is a substrate, 4 is a brazing material, 5 is a lath metal, 6 is a pipe, and 7 is a heat exchanger.

Claims (1)

[Scope of utility model registration request] In a heat exchanger in which a conduit forming plate having a conduit section is used as at least one of the two plate bodies, and a conduit is provided by brazing the two plate bodies, the heat exchange A brazing material of a predetermined thickness is provided on the inner wall of the conduit of the vessel, and the length of the shorter diagonal of the mesh of the mesh is at least twice the thickness of the brazing material, and A heat exchanger characterized in that a net-like material made of a raw material whose wall thickness is larger than the thickness of the brazing material is provided and brazed on the brazing material provided on the inner wall of the pipe.