JPH0996496A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-exchanger to easily and surely fit in a tube without applying flattening machining. SOLUTION: A tube fit-in groove 5 of a fin 1 comprises a tube introduction groove 5a opened to the side edge of a fin 1 and entering the inside, and a tube holding groove 5b connected to the deepest end thereof and having arcuate parts 8a and 8b further expanded than the introduction groove 5a and curved in such a manner that a deepest place forms a groove bottom 6b. A refrigerant tube 3 in which no-flattening machining is not applied is pressed in an introduction space formed in such a manner that a number of the introduction grooves 5a are connected. Through further press-in, the refrigerant tube 3 is fitted in a close contact state internally of a holding space formed in such a manner that a number of the holding grooves 5b are connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger mainly used for evaporators and condensers of refrigerators, showcases, etc., and relates to a heat exchanger formed by fitting refrigerant tubes into fins. .

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, a tube fitting groove 15 is opened at a side edge of a plurality of fins 11 arranged side by side, and a refrigerant tube 13 is fitted into the tube fitting groove 15. Heat exchangers are known. In this type, fitting of the refrigerant tube 13 is performed as follows. As shown in FIG. 5, first, the refrigerant tube 1
Pressure is applied to 3 (Fig. 5a), and the refrigerant tube 13 is flattened (Fig. 5b) so that the minor axis of the refrigerant tube 13 is slightly smaller than the width of the introduction groove 15a of the tube fitting groove 15. Next, after the flattened refrigerant tube 13 is inserted into the holding groove 15b from the introduction groove 15a of the tube fitting groove 15 of the fin 11, pressure is applied again from above the tube fitting groove 15 (FIG. 5c). Fitting groove 15
In the curved surface of the inner wall of the holding groove 15b inside the
The outer surface of 3 is deformed by a kind of "caulking" so that the outer surfaces of the 3 are closely attached (Fig. 5d).

[0003]

However, in the above conventional fitting method, when the flattening process is performed and the tube is inserted into the holding groove 15b of the tube fitting groove 15, the refrigerant tube 13 does not stand upright as shown in FIG. 5c. , It may tilt as shown in FIG. 5e. When the "caulking" deformation is performed in this state, a gap is created between the refrigerant tube 13 and the holding groove 15b inside the tube fitting groove 15, and the contact area is reduced, which causes heat exchange efficiency. There is a problem of decrease.

Therefore, in order to solve the above problems, the present invention eliminates the need for flattening the refrigerant tube,
It is an object of the present invention to provide a heat exchanger capable of easily and surely fitting a refrigerant tube in a tube fitting groove of a fin.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 forms a tube fitting groove in a side edge of a plurality of fins arranged in parallel, and the tube fitting groove is formed in the tube fitting groove. In a heat exchanger formed by fitting a refrigerant tube, the tube fitting groove is a tube introduction groove having a groove width wider than the outer diameter of the refrigerant tube, and the tube introduction groove is connected to the back of the tube introduction groove. The tube holding groove is wider than the groove width of the groove, and the tube holding groove has a flat groove bottom.

According to a second aspect of the present invention, there is provided a heat exchanger in which a tube fitting groove is formed in a side edge of a plurality of fins arranged in parallel, and a refrigerant tube is fitted in the tube fitting groove. The tube fitting groove is composed of a tube introducing groove and a tube holding groove which is connected to the inner side of the tube introducing groove and is wider than the groove width of the tube introducing groove, and the tube holding groove has a flat groove bottom, The groove width of the introduction groove is C, the groove width of the tube holding groove is E, the groove height of the tube holding groove is D ′, the radius RA of the arc portion connecting the tube introduction groove to the holding groove, and the groove bottom of the holding groove from this arc portion. When the radius RB of the circular arc portion connected to and the outer diameter of the tube are D, (D / 2) -2.5≤RA≤ (D / 2) -0.5 (D / 2) -1.0≤RB≤ (D / 2) D ≦ C ≦ D + 1 D ≦ E ≦ D + 3 D-0. It is characterized in that the relationship ≦ D '≦ D-3 was made to hold.

According to these inventions, when, for example, a perfect circular refrigerant tube is pushed into the tube fitting groove of the fin, the refrigerant tube passes through the tube introducing groove and enters the tube holding groove, and the groove is formed. It comes into contact with the bottom and deforms from a perfect circle shape to, for example, a flat shape, and is held in the holding groove in this flat state, so that the refrigerant tube does not need to be flattened, and the refrigerant tube can be fitted easily and securely. be able to. At this time, the existence of the groove bottom provided in the tube holding groove is important. Because of the existence of this groove bottom,
This is because the refrigerant tube is deformed into a flat shape, for example.

Further, in particular, the relationship of (D / 2) -2.5≤RA≤ (D / 2) -0.5 (D / 2) -1.0≤RB≤ (D / 2) is defined. As a result, when the refrigerant tube comes into contact with the groove bottom of the holding groove and deforms from a perfect circle shape to, for example, a flat shape, it is held in the holding groove in this flat state and the refrigerant tube is prevented from coming out of the holding groove. To be done.

[0009]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings. In the present specification,
The term "aluminum" includes not only pure aluminum but also various aluminum alloys.

FIG. 1 shows an embodiment of a heat exchanger according to the present invention. In FIG. 1, reference numeral 100 denotes a heat exchanger, and this heat exchanger 100 is mainly used for an evaporator such as a refrigerator, a showcase, and a vending machine. This heat exchanger 100 is formed by arranging a large number of plate-shaped aluminum fins 1 in parallel with each other and inserting a refrigerant tube 3 which is a refrigerant tube bent in a meandering shape. The fin 1 may be one in which a plurality of single plate-shaped members are arranged side by side, or as shown in the drawing, a flat plate made of aluminum is bent so that peaks and valleys are repeated. It may be a corrugated fin formed.

A tube fitting groove 5 into which the refrigerant tube 3 is fitted is opened at a side edge of each fin 1, and the tube fitting groove 5 is formed by arranging a large number of fins 1 in parallel. The refrigerant tube 3 is fitted in the concave portion.

FIG. 2 shows a detailed structure of the tube fitting groove 5 described above. As shown in FIG. 2, the tube fitting groove 5 is composed of a tube introducing groove 5a and a tube holding groove 5b. The vicinity of the opening of the introduction groove 5a is chamfered 7a so that the refrigerant tube 3 can be easily pushed in and the refrigerant tube 3 is not damaged. The chamfer 7a may be omitted. The groove walls 6a, 6a of the introduction groove 5a extend linearly, and the holding groove 5b is continuous with the innermost end P1 of the groove walls 6a, 6a. The holding groove 5b is formed at the innermost end P1 of the groove walls 6a, 6a.
Arc portion 7b continuous with the innermost part and the innermost end P3 of this arc portion 7b.
The circular arc portion 7b is composed of a first circular arc portion 8a and a second circular arc portion 8b continuous with the connection point P2 of the first circular arc portion 8a.

Specific numerical values for the size of each portion of the tube fitting groove 5 will be described in more detail in the following embodiments.

The operation of fitting the refrigerant tubes 3 into the tube fitting grooves 5 set as described above will be described. First, the fins 1 are arranged side by side, and the fins 1 are fitted in the tubes. The introduction groove 5a of the groove 5 and the perfect circular refrigerant tube 3 without flattening are pushed.
This refrigerant tube 3 passes through the inside of the introduction groove 5a in a perfect circular shape, and when the refrigerant tube 3 is further pushed in, this refrigerant tube 3 causes the innermost end P1 of the groove walls 6a, 6a of the introduction portion 5a to be pushed. It goes over and enters the holding groove 5b, and its groove bottom 6b
Then, as shown in FIG. 3, it is deformed into a flat shape, for example, and finally snapped into the holding groove 5b and closely adhered to the peripheral wall of the holding groove 5b.

According to this, the fin 1 and the refrigerant tube 3
The heat exchange efficiency is improved as much as the spaces are closely contacted with each other, and the manufacturing cost can be reduced as compared with the conventional one because the flattening process of the refrigerant tube 3 is unnecessary.

Although the present invention has been described above based on the embodiment, it is obvious that the present invention is not limited to the above embodiment. For example, although the groove walls 6a on both sides forming the introduction groove 5a are linear and the groove widths of the groove walls 6a are uniformly equal have been described in the above embodiment, the present invention is not limited to this. It is not something that will be done.

[0017]

EXAMPLE Specific numerical values for the size of each portion of the tube fitting groove 5 will be described in detail in this example. The tube fitting groove 5 is the tube introducing groove 5
a and a tube holding groove 5b which is connected to the inner side of the tube introducing groove 5a and is wider than the groove width of the tube introducing groove 5a. The tube holding groove 5b has a flat groove bottom 6b.
Shall have.

Referring to FIG. 2, the tube introduction groove 5a has a groove width C, the tube holding groove 5b has a groove width E, the tube holding groove 5b has a groove height D ', and the tube introduction groove 5a to the holding groove 5b. RA is the radius of the arc portion 8a connected to
When the radius of the arc portion 8b connecting from a to the groove bottom 6b is RB and the outer diameter of the refrigerant tube 3 is D, (D / 2) −2.5 ≦ RA ≦ (D / 2) −0.5 ( 1) (D / 2) -1.0 ≦ RB ≦ (D / 2) (2) D ≦ C ≦ D + 1 (3) D ≦ E ≦ D + 3 (4) D-0.5 ≦ D ′ ≦ D-3 (5) RA <RB (6) F <E (7) It is desirable that the relational expression is satisfied.

According to this, the perfect circular refrigerant tube 3 can be pushed into the introduction groove 5a as it is, and by further pushing it, the refrigerant tube 3 is deformed into a flat shape in the holding groove 5b, and there. Can be held.

[0020]

As is apparent from the above description, according to the present invention, the flattening-free refrigerant tube can be pushed into the introduction space formed by the continuous introduction grooves, and the introduction can be further performed. Since the refrigerant can be fitted into the holding space formed by connecting the plurality of holding grooves in close contact with each other, the refrigerant tube does not need to be flattened, and the manufacturing cost can be reduced.
Moreover, since the outer diameter of the refrigerant tube can be easily and surely brought into close contact with the inner wall of the holding space, heat exchange efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a detailed configuration of a tube fitting groove of a fin for fitting a tube in the heat exchanger shown in FIG.

FIG. 3 is a cross-sectional view showing a state in which a tube is fitted.

FIG. 4 is a perspective view showing a method of fitting a tube into a conventional fin.

FIG. 5 is a process diagram illustrating a procedure for fitting a tube into a conventional fin.

[Explanation of symbols]

 1 Fin 3 Refrigerant Tube 5 Tube Fitting Groove 5a Introduction Groove 5b Holding Groove 6a, 6b Groove Walls 7a, 7b Arc Part 8a First Arc Part 8b Second Arc Part 100 Heat Exchanger

Claims (2)

[Claims] 1. A heat exchanger in which a tube fitting groove is formed at a side edge of a plurality of fins arranged in parallel, and a refrigerant tube is fitted in the tube fitting groove, wherein the tube fitting groove is A tube introduction groove having a groove width wider than the outer diameter of the refrigerant tube, and a tube holding groove connected to the back of the tube introduction groove and wider than the groove width of the tube introduction groove, and the tube holding groove is flat. A heat exchanger having a groove bottom. 2. A heat exchanger in which a tube fitting groove is formed at a side edge of a plurality of fins arranged side by side, and a refrigerant tube is fitted into the tube fitting groove, wherein the tube fitting groove is a tube introduction groove. It is composed of a groove and a tube holding groove which is connected to the depth of the tube introducing groove and is wider than the groove width of the tube introducing groove. The tube holding groove has a flat groove bottom and the groove width of the tube introducing groove is C , The groove width of the tube holding groove is E, the groove height of the tube holding groove is D ′, the radius RA of the arc portion connecting the tube introduction groove to the holding groove, the radius RB of the arc portion connecting the arc portion to the groove bottom of the holding groove, When the outer diameter of the tube is D, (D / 2) -2.5 ≤ RA ≤ (D / 2) -0.5 (D / 2) -1.0 ≤ RB ≤ (D / 2) D ≤ C≤D + 1 D≤E≤D + 3 D-0.5≤D'≤D-3 Heat exchanger, characterized in that as established.