JPS5865513A - Manufacture of needle-shaped finned heat exchanger - Google Patents

Abstract

PURPOSE:To make a draft resistance of a conventional needle-shaped fin more uniform, and to improve an efficiency of heat exchange, by furthermore dividing the tip of a needle-shaped fin, formed by notching a metallic belt toward the inside from the outer peripheral part while leaving the base part of said belt in its longitudinal direction. CONSTITUTION:Needle-shaped fins 7 are respectively formed by providing notches 6, notched toward the inside of a fin part 11 from the outer peripheral part of it so that the base part is left, by a main cutting device 12. Next, each tip 14 of the needle-shaped fin 7 is divided in two parts and is enlarged into the Y shape with the aid of an auxiliary cutting device 13 so that the sufficient heat exchange is attained even by the divided tips. Accordingly, both draft resistance at the tip part 14 and the base part 4 of the needle-shaped fin 7 are made uniform, and the irregularity of the wind velocity is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an intersecting IaI device with needle-like fins,
In particular, by only partially improving the existing equipment, the repeat replacement rate can be increased without increasing material costs.

Conventionally, as shown in FIG. 1, a method for manufacturing a needle drop fin biasing device is to form a heat exchange pipe (1f outer peripheral surface (21'GC metal strip (3)) by winding it in a spiral shape. This metal strip (3f is the base to which the heat exchange pipe n (v) is fixed (
4) remains on the outer periphery of this strip (6)'; a cut (6)' is provided along the inner shoulder of the strip, and a needle-like fin (6)' is provided along the inner shoulder of the strip.
It formed a 7f. Therefore, the heat exchanger (8
When the shield is formed, as shown in Fig. 2, the ventilation resistance of the heat exchange pipe (from the middle part of 1f) becomes smaller as the needle fin (7) moves towards the upper part of the connector (85).
Even if the wind speed tube was applied at a constant speed from the upwind side of the heat exchanger, the wind speed on the leeward side after passing through the heat exchanger became uneven, which was one of the causes of a decrease in the heat exchange rate.

In addition, there is a risk that the tips of this heat exchange pipe with needle fins (81'i) and the tips of the needle fins may be deeply interlocked with each other, and the spacing between the heat exchange pipes may not be maintained evenly. The heat exchanger (8)' is formed by bending the pipe into a meandering shape, which has the disadvantage that the external dimensional force (K11l) is not sufficient.The above-mentioned phenomenon of heat exchange rate paper + is caused by the heat exchanger pipe with needle fins. In addition to the drum-shaped heat exchanger that is bent into a serpentine shape, the drum-shaped heat exchanger that is rotated in a drum shape is shown in 12. Ta.

The present invention was developed in view of the above-mentioned drawbacks, and consists of a metal strip continuous in the longitudinal direction at its base flU, and a pipe cut inward from the outer periphery of the strip to form an acicular fin. Furthermore, the tip WA of this needle-like 74 piece is divided into a plurality of pieces, and the Mle base is spirally wound around the outer periphery 1111 of the heat exchange pipe, so that it can be used as the main cutter device for forming cuts in the metal strip. It is sufficient to add an auxiliary cutter device that divides the tip fII of the needle fin into several parts, and the unsigned rate can be kept the same by dividing the tip s' of the needle fin using a conventional metal strip. It is possible to
In Fig. 3, (1) is a heat exchange pipe that allows the refrigerant to pass through the hollow part α□, and (3) Fi is a heat exchange pipe that is spirally wound around the outer peripheral surface (2) of this heat exchange pipe as shown by the solid arrow. This metal strip is formed into a cross-section with a cross section consisting of a base (4) continuous in the longitudinal direction and a fin section 0υ standing at right angles to the base, and the main cutter device ( In step 2), remove the outer periphery of the fin part aυ so that the base remains (5).
A notch (6) is made inward from each needle-like 74 in (
After forming 7), divide the tip α4 of the dog's needle-like fin (7) into two using the auxiliary force 1ter device 0 and spread it into a Y-shape to make the tip of the fin enough to form a blank sheet. It is configured so that the rate can be obtained.

Therefore, using this needle drop fin replacement pipe as an example,
As shown in the figure, the meandering bends are stacked and intersect with each other (
8), the tailwind resistance at the tip 04 of the needle-like fin and the base (4) of the needle-like fin becomes uniform, and unevenness in the wind speed passing through this heat exchanger is reduced, resulting in heat exchange. You can increase the rate.

Furthermore, since the tips of the needle-like fins are divided into a plurality of parts, the depth of engagement between the tips of the needle-like fins is kept shallow, and the interval between the heat exchange pipes (1) is kept constant and the external dimensions are uniform. A heat exchanger can be configured.

In the above example, the main cuffer (2) and the auxiliary cover (2) were used to make the fin part of the metal strip into a needle-like fin with a split tip. ) If the -ISK auxiliary cutter teeth 3 of the tooth shape are incorporated, it will be possible to manufacture this needle-like fin with one cuff I-! The division of the tip of the needle fin is not limited to two, but may be determined according to the width of the needle fin, and the division depth is about 10 degrees from the base. It is said that if the fin is divided deeper than this, the strength of the base of the fin will be poor and it will be impractical.

As described in detail above, the present invention leaves a continuous base in the longitudinal direction of a metal strip, cuts inward from the outer periphery of the strip to form an acicular fin, and furthermore, the acicular fin is The distal end portion is divided into a plurality of pieces, and the base portion t-
Since it is wound spirally around the outer circumferential surface of the pipe, the ventilation resistance is increased by the amount that the light end W6 of the needle-like fin is divided by using the conventional metal strip. It is possible to increase the correspondence rate.

WP with this needle-like fin in history! Since the tips of the fins of the father exchange pipe are divided, even if the pipes are stacked together, the depth at which the fins engage with each other can be kept shallow, and a cross-section vessel with uniform external dimensions can be constructed.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional needle-shaped 7-in 111's 5e thin pipe winding situation, Fig. 2 is a wind speed distribution diagram in the same conventional heat exchanger, and Fig. 6 is a 19th inventive one of the present invention. ! FIG. 4 is a perspective view illustrating a situation in which a needle-shaped 7-injector is wound around an exchange pipe, and FIG. 4 is a wind velocity distribution diagram in a non-exchanger according to an embodiment of the present invention. (1)...Heat exchange by 1, (2+...
Outer peripheral surface, (3)...Metal strip, (41-...
... Base, (7) ... Needle-shaped 7 inches. (14-
...Tip.

Claims (1)

[Claims] 1) A continuous base portion of the metal strip remains in the longitudinal direction, and incisions are made inward from the outer periphery of the strip to form needle-like fissures, and a plurality of tip portions of the needle-like fissures are formed. 1. A method for manufacturing a heat exchanger with needle fins, characterized in that the base portion is divided into two parts and the base portion is spirally wound around the outer circumferential surface of a non-exchangeable pipe.