JP2933709B2 - Heat exchanger - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly, to a heat exchanger used for a part with frost such as a refrigerator.

[Conventional technology]

Showcases, commonly referred to as snap-in,
A method of manufacturing a heat exchanger used for a refrigerator such as a refrigerator is known.

In this type of manufacturing method, as shown in FIG. 6, a plurality of tube insertion long holes 3 are formed on the plate surface of the plate fin 1, and in this long hole 3, as shown in FIG. It is formed through a meandering refrigerant tube 5. A rib 7 for reinforcing the elongated hole 3 is formed on the periphery of the elongated hole 3 for tube insertion, and a catch piece 8 for gripping the refrigerant tube 5 is integrally formed on the hole wall of the elongated hole 3 for tube insertion. Is formed.

As shown in FIG. 5, the refrigerant tube 5 includes a straight pipe portion 5a and a curved pipe portion 5b, and the blood vessel portion 5b has a thickness larger than the outer diameter of the straight pipe portion 5a as shown in FIG. It is formed in a flat shape so as to be small. As shown in FIG. 6, the tube insertion slot 3 has a width smaller than the outer diameter of the straight tube portion 5a of the refrigerant tube 5 and larger than the outer diameter of the blood vessel portion 5b.
At both ends of the long hole 3, catch holes 6 for receiving the straight pipe portion 5a of the refrigerant tube 5 are formed.
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By the way, in a heat exchanger used for a portion accompanied by frost, a heater for defrosting is separately installed, and defrosting is performed at regular intervals by the heat of the heater.

In this case, as shown in FIG. 6, a heater tube fitting groove 9 is formed in the side edge 1a of the plate fin 1, and an aluminum heater tube (not shown) is formed in the tube fitting groove 9. ).

[Problems to be solved by the invention]

However, in the conventional configuration, since the heater tube is fitted into the tube fitting groove 9 of the plate fin 1, the heater tube becomes an obstacle to the air flowing between the plate fins 1 and the air side However, there is a problem that the pressure loss increases.

In this type of heat exchanger, the refrigerant tube 5 is often frosted, but the heater heat from the heater tube is not directly transmitted to the refrigerant tube 5 but is transmitted through the plate fins 1. 5 has a problem in that the efficiency of heat transfer to the heat exchanger 5 decreases.

Therefore, an object of the present invention is to solve the problems of the above-described conventional technology, reduce the pressure loss of air flowing between the plate fins, and efficiently transfer the heater heat from the heater tube to the refrigerant tube. It is an object of the present invention to provide a heat exchanger.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a combination tube formed by arranging a heater tube along a straight tube portion of a refrigerant tube bent in a meandering shape, and a U-shaped blood vessel portion of the combination tube. Is formed in a flat shape so that the thickness is smaller than the outer diameter of the straight tube portion of the combination tube, and the plate surface of a group of plate fins arranged in parallel with each other has a smaller diameter than the outer diameter of the straight tube portion. A refrigerant tube catch hole for receiving a straight tube portion of the refrigerant tube, and a catch hole for receiving a straight tube portion of the combination tube at both ends and having a width larger than the outer diameter of the curved tube portion; Forming a plurality of tube insertion slots having a catch hole composed of a heater tube catch hole for receiving a straight tube portion of the heater tube continuous to the catch hole;
A curved tube portion is inserted into these long holes, and the straight tube portion is fitted into the catch hole integrally.

(Operation)

According to the present invention, when assembling the heat exchanger, a plurality of plate fins are arranged in parallel, the elongated holes for inserting the tubes of these plate fins are aligned, and the combined tube is fitted therein. The thickness of the curved tube part of the combination tube is
Since the width is smaller than the width of the tube insertion slot, the combination tube can be fitted through the slot of each plate fin. After the fitting, the catch holes are formed at both ends of the elongated hole, so that the straight pipe portion of the combination tube is fitted into the catch holes exactly. Thus, a heater tube is formed along a meandering bent refrigerant tube to form a combination tube, and this combination tube is fitted into a long hole of a group of plate fins. In contrast, the heater tube does not become an obstacle,
In addition, since the heater tube is in contact with the refrigerant tube, the heat of the heater from the heater tube is directly transmitted to the refrigerant tube with much frost, thereby improving the efficiency of heat transfer to the refrigerant tube.

〔Example〕

Hereinafter, an embodiment of the heat exchanger according to the present invention will be described with reference to FIGS. 1 to 4 in which the same parts as those in FIG. 5 or FIG.

In FIG. 2, reference numeral 1 denotes a plate fin made of aluminum, and the plate fins 1 are arranged at appropriate intervals in parallel with each other as shown in FIG. At both ends of the plate fin 1, thick side plates 30 made of aluminum are joined, and at both ends of the side plate 30, brackets 31 as folded pieces are formed. The bracket 31 is for fixing the heat exchanger to the fixed portion, and the bracket 31 is provided with two bolt holes 32.

On the plate surface of the group of plate fins 1, a plurality of tube insertion slots 13 are arranged in a zigzag pattern. In these tube insertion slots 13, a meandering combination tube 20 made of aluminum is staggered. It is fitted in. As shown in FIG. 4, a rib 17 for reinforcing the long hole 13 is formed on the periphery of the long hole 13 for inserting a tube. Are integrally formed.

The combination tube 20 includes a refrigerant tube 5 through which the refrigerant passes,
It consists of a heater tube 15 through which a heater passes.
As shown in FIG. 1, the heater tube 15 is formed inside the refrigerant tube 5 bent in a meandering shape. The combination tube 20 includes a straight tube portion 20a and a curved tube portion 20b, and the curved tube portion 20b is, as shown in FIG.
It is formed in a flat shape so as to have a thickness smaller than that of the straight pipe portion 20a.

The combination tube 20 is not limited to a tube formed by combining separate tubes 5 and 15, respectively, and may be a single tube provided with, for example, a refrigerant passage hole and a heater passage hole. It is clear that this is fine.

As shown in FIG. 4, the tube insertion slot 13 has a width W smaller than the outer diameter of the straight tube portion 20a of the combination tube 20 and larger than the outer diameter of the curved tube portion 20b. Slot 1
At both ends of 3, a coolant tube catch hole 26 for receiving the straight tube portion 5 a of the coolant tube 5, and a straight tube portion of the heater tube 15
A heater tube catch hole 25 for receiving 15a is formed. That is, the heater tube catch hole 25 continues outside the refrigerant tube catch hole 6, and these catch holes
25 and 26 are formed to receive the straight pipe portion 20a of the combination tube 20.

In order to assemble this heat exchanger, a plurality of plate fins 1 are arranged in parallel, the elongated holes 13 for inserting tubes of these plate fins 1 are aligned, and a combined tube
20 is fitted from left to right in FIG.

According to the present embodiment, the thickness of the curved tube portion 20b of the combination tube 20 is smaller than the width W of the tube insertion slot 13, so that it passes through the slot 13 of the plate fin 1 and Push the 18 and put the combined tube in the slot 13
20 can be fitted. After inserting this,
Since the catch holes 25, 26 are formed at both ends of the elongated hole 13, the straight pipe portions 5a, 15a constituting the straight pipe portion 20a of the combination tube 20 fit in the catch holes 25, 26 exactly. Is done.

Finally, as shown in FIG. 1, an end of the combination tube 20 is cut off, and a heater circuit is formed by passing a heater through the heater tube 15.

According to this embodiment, the heater tube is provided inside the refrigerant tube 5 bent in a meandering shape so as not to be an obstacle to the air flowing between the plate fins 1.
15 are formed along with each other to form a combination tube 20, and this combination tube 20 is inserted into the catch holes 25, 2 of the group of plate fins 1.
6, the heater tube 15 does not hinder the air flow flowing between the plate fins 1, and the air-side pressure loss can be suppressed as compared with the conventional one. .

Further, according to this embodiment, since the heater tube 15 is in contact with the refrigerant tube 5, the heater heat from the heater tube 15 is directly transferred to the refrigerant tube 5 with much frost, so Can significantly improve the heat transfer efficiency as compared with the conventional one.

Further, unlike the conventional one, there is no need to form a fitting groove on the side edge of the plate fin 1, and there is no need to fit a heater tube into the fitting groove, so that the width of the plate fin 1 is reduced. Therefore, various effects can be obtained such that the heat exchanger itself can be designed to be compact.

In the embodiment described above, the combination tube 20
Are arranged in a zigzag pattern with respect to the plate fin 1, but the present invention is not limited to this. It is obvious that the combination tubes 20 may be arranged in parallel with the plate fin 1. It is.

〔The invention's effect〕

As is clear from the above description, according to the present invention, a combined tube is formed by arranging a heater tube along a meandering bent refrigerant tube, and
The curved tube portion is formed in a flat shape so that the thickness is smaller than the outer diameter of the straight tube portion of the combination tube, and on a plate surface of a group of plate fins arranged in parallel with each other,
A plurality of tube insertion slots having a width smaller than the outer diameter of the straight tube portion and larger than the outer diameter of the bent tube portion and having catch holes for receiving the straight tube portions at both ends are formed. The curved tube section is inserted through the long hole for use, and the straight tube section is integrally fitted into the catch hole, so that the heater tube does not hinder the airflow flowing between the plate fins, and the conventional The pressure loss on the air side can be suppressed to be lower than that of the above-mentioned one.

In addition, since the heater tube is in contact with the refrigerant tube, the heater heat from the heater tube is directly transferred to the refrigerant tube with much frost, so that the efficiency of heat transfer to the refrigerant tube is significantly higher than that of the conventional one. Various effects such as improvement can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the heat exchanger according to the present invention, FIG. 2 is a plan view showing catch holes of plate fins, FIG. 3 is a side view showing a bent portion of a combined tube, FIG. FIG. 5 is an enlarged plan view showing a catch hole of a plate fin, FIG. 5 is a side view showing a conventional heat exchanger, FIG. 6 is a plan view showing a catch hole of a conventional fin, and FIG. It is a side view which shows the curved tube part of a refrigerant tube. 1 ... plate fins, 5 ... refrigerant tubes, 13 ... long holes for inserting tubes, 15 ... heater tubes, 20 ... combination tubes, 5a, 15a, 20a ... straight pipes, 5b, 15b, 20b ... … Bent tube, 25,26 …… Catch holes.

Claims (1)

(57) [Claims] 1. A combination tube is formed along a heater tube so as to be sandwiched between straight tube portions of a refrigerant tube bent in a meandering shape, and a U-shaped blood vessel portion of the combination tube is formed.
The combination tube is formed in a flat shape so as to have a thickness smaller than the outer shape of the straight tube portion, and the plate surface of a group of plate fins arranged in parallel with each other is smaller than the outer shape of the straight tube portion. A catch hole that has a width larger than the outer shape of the blood vessel portion, and is a catch hole for receiving the straight tube portion of the combination tube at both ends, the coolant tube catch hole for receiving the straight tube portion of the coolant tube, and the coolant tube catch hole. A plurality of elongate holes for inserting a tube having a catch hole formed of a heater tube catch hole for receiving a straight tube portion of the continuous heater tube are formed, and the blood vessel portion is inserted through these elongate holes for inserting the tube to form the straight tube. A heat exchanger, wherein a portion is integrally fitted into the catch hole.