JP2560073Y2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat exchanger, and more particularly, to a heat exchanger used for a part with frost, such as an evaporator for a showcase or an evaporator for a refrigerator.

[Conventional technology]

In general, a method of manufacturing a heat exchanger such as an evaporator for a showcase or an evaporator for a refrigerator, which is called a fitting type, is known.

In this type of manufacturing method, as shown in FIG. 4, a catch groove 2 is formed on a side edge 1a of an aluminum fin 1 and an aluminum refrigerant tube 3 for passing a refrigerant through the catch groove 2. Is fitted by a press.
A rib 7 for reinforcing the groove is formed on a peripheral edge of the catch groove 2, and a catch piece 8 for grasping the refrigerant tube 3 is integrally formed on a peripheral wall of the catch groove 2.

By the way, in a heat exchanger used for a part with frost formation, a heater for defrost is separately attached, and defrosting is performed at regular intervals by heater heat.

In this case, as is clear from FIG. 5, catch grooves 5, 5 are separately formed on the side edge 1a of the fin 1, and a heater (not shown) is passed through the catch grooves 5, 5. The aluminum heater tube 6 is fitted by a press. A catch piece 9 for holding the heater tube 6 is integrally formed on the peripheral wall of the catch groove 5.

[Problems to be solved by the invention]

However, in this type of conventional configuration, the tubes 3,
6 are formed separately, and these tubes 3 and 6 are separately fitted into the grooves 2 and 5 by pressing. There is a problem of cost increase. Also, fin 1
The side edge portions 1a, so to form two grooves 2,5, correspondingly, narrows the interval [delta] ₁ of the grooves 2,5, the strength of the fin 1 is reduced.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technology, and to provide a heat exchanger that can reduce the cost of a product without requiring two types and two processes on a component side and a processing side. To provide.

[Means for solving the problem]

Means for Solving the Problems In order to achieve the above object, the present invention forms a circular double tube having a refrigerant passage hole and a heater passage hole and having a constricted portion substantially at the center, and a group of plates arranged in parallel to each other. In each side edge portion of the fin, an inlet groove portion formed to expand toward the inlet side, and a circular double groove portion connected to the inner side of the inlet groove portion and having a protrusion fitted to the constricted portion, A catch groove for receiving the circular double tube is formed, and the circular double tube is press-fitted into the catch groove from the inlet groove side.

[Action]

According to the present invention, since the refrigerant passage and the heater passage are formed in the circular double tube, the refrigerant tube and the heater tube do not need to be formed separately, and are arranged in parallel with each other. A catch groove for receiving a circular double tube is formed at each side edge of the group of plate fins.
When fitting a series tube, it is not necessary to fit separate tubes in separate grooves as in the past,
Since two types and two steps are not required on the processing surface, each type requires only one type and one step, the cost of the product can be reduced, and one type of catch groove is provided on the side edge of the plate fin. Can be formed, so that the gap between the catch grooves can be made wider than that of the conventional one.

〔Example〕

Hereinafter, an embodiment of the heat exchanger according to the present invention will be described with reference to FIGS. 1 to 3 in which the same parts as those in FIG.

In FIG. 1, reference numeral 1 denotes an aluminum plate fin, and the plate fins 1 are arranged at appropriate intervals in parallel with each other. As shown in FIG. 2, the plate fin 1 has a side edge 1a.
Are formed at appropriate intervals δ in the longitudinal direction. This catch groove 2 is the entrance groove 2a
And an approximately figure-shaped circular double continuous groove portion 2b, 2c having a protruding portion connected to the back side of the inlet groove portion 2a and protruding into the groove, and the inlet groove portion 2a is formed to expand toward the inlet side. Have been. A rib 15 for reinforcing the catch groove 2 is formed on a peripheral edge of the catch groove 2, and a catch piece 16 for gripping the refrigerant tube 10 (described later) is provided on a peripheral wall of the catch groove 2.
Are integrally formed.

As shown in FIG. 1, an extruded aluminum circular double tube 10 is fitted into the catch groove 2. At the approximate center of this circular double tube 10,
As shown in FIG. 3, a constricted portion to be fitted to the protruding portion is formed. The circular double tube 10 has a coolant passage hole 11 for passing a coolant and a heater passage hole 12 for passing a heater (not shown).

When extruding the circular double tube 10, the refrigerant passage
Helical fins (inner fins) may be integrally formed on the inner wall of the heater through hole 11 and the inner wall of the heater through hole 12, respectively. By forming this inner fin, the efficiency of heat radiation through the plate fin 1 can be improved.

At the initial stage, the shape of the circular double tube 10 is crushed and flattened as shown in FIG. 3 (b), and the width w of the circular double tube 10 is the maximum of the inlet groove 2a. The width is narrower by α than the width W of the narrow portion, that is, w = W−α.

To assemble this heat exchanger, a plurality of plate fins 1 are arranged in parallel, the catch grooves 2 of these plate fins 1 are aligned, and a circular duplex tube 10 is fitted therein. Here, it is pushed in by a press using a known jig (not shown).

When pressed by a press, the circular double tube 10 is crushed and deformed into a double circular cross section as shown in FIG. 3 (a). According to this, it is crushed by the circular double tube 10, and its outer surface pushes the catch piece 16 of the catch groove 2 of the plate fin 1 to fit into the circular double groove portion 2 b, 2 c of the catch groove 2. Are combined.

Finally, as shown in FIG. 1, an end of the circular double tube 10 is cut off, and a heater circuit is formed through a heater through hole 12 through a heater.

Thus, according to this embodiment, while forming the circular double tube 10 having the refrigerant passage 11 and the heater passage 12, a group of plate fins 1 arranged in parallel with each other is formed.
A catch groove 2 for receiving a circular double tube 10 is formed in each side edge 1a of the cylinder.
Since 10 is inserted, 2 types and 2 processes are no longer necessary on the component side and processing side as in the past,
Since only one process is required, the cost of the product can be reduced.

Further, since only one kind of catch groove 2 may be formed on the side edge 1a of the plate fin 1, the interval δ between the grooves 2 can be made wider than that of the conventional one, and Effects such as the strength can be improved.

In the above embodiment, the heater passage hole 12 is formed inside the circular double tube 10 and the refrigerant passage hole 11 is formed outside, but the position where the coolant passage hole 11 is formed may be reversed. However, in consideration of ease of assembly, it is desirable that the diameter of the inner circular portion be larger than the diameter of the outer circular portion.

Further, the circular double tube 10 may be formed integrally with a refrigerant tube along with another heater tube. That is,
In advance, two tubes are formed, and then
The tubes may be joined.

[Effect of the invention]

As is apparent from the above description, according to the present invention, a circular double tube having a refrigerant through hole and a heater through hole integrally formed, and each side edge of a group of plate fins arranged in parallel with each other. Since a catch groove for receiving the circular double tube is formed in the portion and the circular double tube is integrally fitted into the catch groove, as in the conventional case,
Since two types and two steps are not required on the component side and the processing side, and each type requires only one type and one step, the cost of the product can be reduced. Further, since only one type of catch groove may be formed on the side edge of the plate fin, the gap between the grooves can be widened as compared with the conventional one, so that the strength of the plate fin can be improved. Various effects can be achieved, such as the ability to

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the heat exchanger according to the present invention, FIG. 2 is a perspective view showing a catch groove of the plate fin, and FIGS. 3 (a) and 3 (b) are each circular. FIG. 4 is a plan view showing a double tube, FIG. 4 is a perspective view showing a catch groove of a conventional fin, and FIG. 5 is a perspective view showing a catch groove of the conventional fin. DESCRIPTION OF SYMBOLS 1 ... Plate fin, 1a ... Side edge part 2, ... Catch groove, 10 ... Circular double tube, 11 ... Refrigerant passage hole, 12 ...
... Heater through hole.

Claims (1)

(57) [Scope of request for utility model registration] 1. A circular double tube having a coolant passage and a heater passage, and having a constricted portion substantially at the center, is formed at each side edge of a group of plate fins arranged in parallel with each other. Receiving the circular double tube, comprising: an inlet groove formed to widen toward the inlet side; and a circular double groove having a protruding portion connected to the inner side of the inlet groove and fitted to the constricted portion. A heat exchanger, wherein a catch groove is formed, and the circular duplex tube is press-fitted into the catch groove from the inlet groove side.