JPH033143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a heat exchanger for a refrigerator or the like in which a spine fin tube is spirally wound, and is used, for example, in a cooler.

(B) Prior art The applicant of the present invention has filed Japanese Patent Application No. 58-228862, in which a heat exchanger in which a spine fin tube is spirally wound is placed in close contact with the upper and lower walls of its storage chamber. However, due to the heat exchanger's own weight and shock during transportation of the refrigerator, the spine fins at the bottom of the heat exchanger gradually collapse, and a gap is created at the top of the heat exchanger by the amount of collapse and downward displacement. occurs, and the air flow bypasses this gap without effectively exchanging with the heat exchanger, resulting in a disadvantage that the heat exchange efficiency of the heat exchanger is significantly reduced.The present invention aims to prevent this disadvantage. The applicant further filed a U.S. Patent Application in 1983
No. 189006 was filed, but although the spine fin does not collapse, the drawback is that the heat exchange efficiency is low because air flow that does not exchange heat with the heat exchanger occurs from the gap that occurs in the middle of the winding pitch on the installation surface. There is.

(c) Problems to be Solved by the Invention The present invention aims to eliminate the above-mentioned drawbacks and improve the heat exchange efficiency of a heat exchanger.

(d) Means for solving the problem The present invention includes a ring-shaped support member having an outer diameter slightly smaller than the outer diameter of the spine fin tube, which is fitted into the heat exchange pipe that forms the core of the spine fin tube. Further, the tip of the spine fin located on the installation surface is bent so as to have the same outer diameter as the ring-shaped support member.

(e) Effect According to the present invention, the outer diameter of the ring-shaped support member is made slightly smaller than the outer diameter of the spine fin, so that the spine fin located on the installation surface can be attached to the ring in advance or at the time of installation. By bending the ring-shaped support member to the same extent as the outer diameter, the gap at the middle part of the winding pitch can be reduced, and the spine fin can be bent to a predetermined gap without being crushed beyond the outer diameter of the ring-shaped support member. There is no gap at the top of the heat exchanger.

(f) Examples An embodiment of the present invention will be described.

In Fig. 1, 1 is the refrigerator main body, and the outer box 1a
An inner box 3 is disposed through a heat insulating material 2, which is divided into a freezing compartment 5 and a refrigerating compartment 6 by a partition 4, and a compressor 7, a condensing pipe 8, a heat exchanger 9, etc. A refrigeration cycle is formed, and cold air cooled by a heat exchanger 9 is fed to a freezer compartment 5 and a refrigerator compartment 6 by a fan 10. Reference numerals 11 and 12 are doors for opening and closing the freezer compartment 5 and the refrigerator compartment 6.

The heat exchanger 9 will be explained.

In Fig. 2, reference numeral 13 denotes a spine fin tube made of a material with high thermal conductivity such as copper or aluminum, and a heat exchange pipe 15 with double-sided adhesive tape 14 pasted on both ends in units of required length through which the refrigerant flows. A band member 17 having spine fins 16, 16, . . . connected thereto is spirally wound around the outer periphery.
The band member 17 is notched perpendicularly to its longitudinal direction, and both sides of the incision are raised to form a U-shape. this spinefinch ube 13
The starting end of the strip member 17 is fixed to the double-sided adhesive tape 14 portion of the heat exchange pipe 15, and the heat exchange pipe 15 is rotated in the direction of arrow A and simultaneously moved in the direction of arrow B at an arbitrary speed, thereby forming an arbitrary pitch. The end portion is fixed with double-sided adhesive tape 14 to form a straight tube shape.

Further, since the band-shaped members 17 at both ends of the heat exchange pipe 15 are instantly bonded by the double-sided adhesive tape 14, there is no loosening or unwinding, and workability is improved. In FIG. 3, reference numeral 18 denotes a mandrill as a jig for helically curving the straight spine fin inch tube 13, and the tip 18a, which is extended substantially linearly, is curved in a curved manner corresponding to the turning diameter of the spiral. A twist (indicated by arrow D) corresponding to the pitch P (indicated by arrow C) and a twist (indicated by arrow D) are formed. A ring-shaped support member 19 and a spine fin inch tube 13, which will be described later, are inserted into the jig 18 from the straight portion of the jig. After the support member 19 and the spine inch tube 13 are fitted, the fixing jig 2 is inserted into the exposed portion 18b of the jig 18, as shown in FIG.
0, and the jig 18 is fixed with this fixing jig 20. After fixing the jig 18, the feeder 21 is slid along the jig 18 in the direction of arrow H by a feeder (not shown). Then, the spine finches 13 are pushed forward of the jig 18 via the feeder 21. When the spine inch tube 13 passes through the tip 18a of the jig 18, it is bent in the turning direction according to the curved form (indicated by arrow C), and at the same time in the direction of pitch P according to the twist (indicated by arrow D). It is bent into the desired spiral configuration. Here, in the spine fin inch tube 13, the strip member 17 is further tightened to the outer periphery of the heat exchange pipe 15 in the winding direction of the strip member 17 and when the spine fin inch tube 13 is turned. It is crimped and fixed to the heat exchange pipe 15 without using any adhesive other than the double-sided adhesive tape 14 at the bottom.

As shown in FIG. 5, the spine fin inch tube 13 is provided with another spine fin inch tube 22 formed in the same manner, and the connecting portions 23, 2
By brazing and connecting 4 and 25, a heat exchanger 9 for a refrigerator is obtained. The heat exchanger 9 is provided with the ring-shaped support members 19, 19, . . . fitted into the heat exchange pipe 15. The ring-shaped support members 19, 19... are specifically made of heat-resistant neoprene rubber or plastic, and have an outer diameter Da equal to that of the spine finches 13 and 22.
The outer diameter Db is set to be approximately 2 mm to 8 mm smaller than the outer diameter Db. These ring-shaped support members 19, 19...
The spine fins 16, 16... located on the installation surface are bent to the same extent as the outer diameter of the ring-shaped support members 19, 19..., that is, bent so that they are approximately flush with the lower ends of the ring-shaped support members 19, 19... At the same time, the distance between the heat exchange pipe 15 and the installation surface is maintained at a predetermined distance to prevent the spine fins 16, 16, . . . from collapsing any further. The spine fins 13, 22 are spirally wound, and by bending the spine fins 16, 16 located on the installation surface side, the spine fins 13, 22
By reducing the gap C between the winding pitches P of winding pitches P and the installation surface, and increasing the number of contact areas with the installation surface, the weight is concentrated on the contact areas and the spine fins 16, 16... The ring-shaped support members 19, 19, . . . effectively prevent it from collapsing. Some of the ring-shaped support members 19, 19... are fitted into the heat exchange pipe 15 before the heat exchange pipe 15 is spirally wound, and are used for heat exchange after the heat exchange pipe 15 is wound. When the end of the pipe 15 is expanded for connection to another pipe, this expanded portion prevents it from coming off and prevents it from being erected from a predetermined position.

As shown in FIG. 6, in the heat exchanger 9, when installed in the partition part 4, at the inner diameter part of the spiral,
The defrosting pipe heater 26 is held using the elasticity of the spine fin 16. In order to prevent deterioration of the defrosting pipe heater 26 due to heat, the ring-shaped support members 19, 19, . . . are formed of a heat-resistant material. The defrosting pipe heater 2
6 is a spine fin 16, 16 on the installation surface.
... to increase the contact area with the installation surface to improve heat conduction of the defrosting pipe heater 26,
This means that among the frost on the heat exchanger 9, the quality of the frost between it and the installation surface and in the vicinity is due to the formation of hard ice-like parts due to water droplets remaining during previous defrosting. This is effective in preventing differences in defrosting time between the upper and lower parts of the heat exchanger 9, or in preventing residual frost.

In FIGS. 7 to 9, the partition section 4 is
The lower part of the inner box 3a on the side of the freezer compartment is formed into a concave part 3b located in the middle partition, a dew receiving plate 27 is laid in this concave part, the heat exchanger 9 is installed on this, and further on this. A heat insulating board 28 made of styrofoam or the like is placed, and finally a bottom plate 29 of the freezer compartment 5 is placed and fixed. The bottom surface of the concave portion 3b is sloped downward toward a drainage port at the back for draining defrosting water. The dew receiving plate 27 is made of a material with good thermal conductivity, such as aluminum, and is laid on the bottom surface of the recessed part 3b to form a groove 27a and a drain port 27b for guiding defrosting water, and has a cord for preventing freezing on the back surface. A heater 27c is attached. The heat insulating plate 28 has legs 28a, 28a forming return air inlets on the left and right sides of the lower surface, and two arcuate recesses 28b, 28b in the left and right direction in the deep part thereof. . This groove has an arc shape along the outer periphery of the heat exchanger 9,
In addition, by making the grooves in the front stage deep and the grooves in the rear stage shallow, the downward slope of the bottom surface can be absorbed and the heat insulating board 2
Make sure that the top surface of 8 is horizontal, and make sure that the groove 28
b, 28b regulate the front and back and left and right positions (also the spacing between the front and rear stages) of the heat exchanger 9, and the heat exchanger 9 is disposed at a predetermined position. The grooves 28b, 28b
Reinforcing plates 28c, 28c are attached to the spine fins 16, 16, . Said bottom plate 29
The heat insulating plate 2 is inserted by fitting the left and right edges into a pair of grooves 3c, 3c formed in the inner box 3a on the freezer compartment side.
8, the heat exchanger 9 is placed in a predetermined position, and the concave grooves 28b, 28b of the heat insulating plate 28 allow the middle part of the winding pitch P in the upper part of the heat exchanger 9 to be
This reduces the time C. Heat exchanger 9 is heat insulating board 2
By being pressed from
6... is crushed, but the ring-shaped support members 19, 19
Due to the presence of..., the crushing stops at approximately the outer diameter of the ring-shaped support member 19. As a result, the spine fin 16 located on the installation surface is bent to have the same outer diameter as the ring-shaped support member 19 as described above. On the one hand, the presence of the ring-shaped support member 19 prevents further collapse.

(G) Effects of the Invention Since the present invention is configured as described above, the gap in the middle part of the winding pitch on the installation surface of the heat exchanger formed by spirally winding is reduced, and the heat exchanger of the spine finches is reduced. The distance between the pipe and the installation surface is maintained at a certain distance, which prevents the spine fin from collapsing and thereby widening the gap at the top of the heat exchanger, thus improving the heat exchange efficiency of the heat exchanger. can be improved.

[Brief explanation of the drawing]

Each of the drawings shows one embodiment of the present invention.
The figures are longitudinal sectional views of the refrigerator, Figures 2 to 5 a,
b, c are explanatory diagrams of each manufacturing process of the heat exchanger, Fig. 6 is a cross-sectional view of a part of Fig. 1, Fig. 7 is an enlarged view of the same main part, Fig. 8 is an exploded perspective view of the same, Fig. Figure 9 is A of Figure 7.
-A cross-sectional view. 13, 22...Spine Finch Yube, 15
...Heat exchange pipe, 16...Spine fin, 1
9...Ring-shaped support member, Da...Outer diameter of ring-shaped support member, Db...Outer diameter of spine fin inch tube.

Claims (1)

[Claims] 1 A heat exchanger that is constructed by arranging a number of spine fins of the same size on the outer periphery of a heat exchange pipe to form a spine fin tube, and winding this spine fin tube in a spiral shape, and installed on a predetermined installation surface. A ring-shaped support member having an outer dimension slightly smaller than the outer dimension of the spine fin inch tube is fitted into the heat exchange pipe, and is positioned on the installation surface when the heat exchanger is installed. A heat exchanger for a refrigerator or the like, wherein the spine fin is bent so as to be substantially flush with the outer shape of the ring-shaped support member.