JP2004239485A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger, maintaining conventional heat exchanging performance by suppressing the deterioration of heat exchanging performance resulting from the construction of one independent fin with extremely less joints. <P>SOLUTION: The cross-fin type heat exchanger comprises the one independent fin and only one refrigerant pipe having contact therewith. It is constructed by applying three-dimensional bending work to one originally straight refrigerant pipe after joining the fin thereto. The one independent fin is turned around at one or more places on the outer sides or on four corners. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The heat exchanger structure of the present invention relates to a cross-fin type heat exchanger having a structure in which a refrigerant tube and a fin are combined, and particularly relates to a heat exchanger having a one-stroke structure refrigerant pipe, and in particular, a refrigerator using the same. It is about.
[0002]
[Prior art]
A conventional cross-fin type heat exchanger having a structure in which a refrigerant tube and a fin are combined has a constant shape as described on page 63 of “Tube Forming” (First Edition, 1992, Corona) edited by Japan Society for Technology of Plasticity. It is composed of a plurality of refrigerant tubes arranged in parallel at intervals and a plurality of fins arranged at regular intervals in a direction perpendicular to the refrigerant tubes. At this time, a plurality of through-holes are provided in one independent fin, and a refrigerant pipe is passed through each of the through-holes, and each fin and the refrigerant pipe are fastened by expansion. The fins are provided with slits as needed to increase the heat exchange performance.
[0003]
In addition, one fin is provided with one through-hole, and after passing through a predetermined refrigerant pipe through the through-hole and expanding to obtain a sufficient binding force, the refrigerant pipe is bent to obtain an arbitrary shape. There is a cross-fin type heat exchanger having a single-stroke structure refrigerant pipe without a joint for obtaining the following.
[0004]
[Non-patent document 1]
"Tube forming", Corona Publishing, 1992, p. 62-63
[0005]
[Problems to be solved by the invention]
In the case of the cross fin type heat exchanger in which a plurality of refrigerant tubes are passed through one independent fin of the above-mentioned conventional technology, heat exchange is performed by alternately joining straight tubes and 180-degree bent tubes. Because of the configuration of the heat exchanger, the reliability with respect to refrigerant leakage is inferior to a cross-fin heat exchanger having a one-stroke structure refrigerant pipe without a joint.
[0006]
On the other hand, one fin is provided with one through-hole, a predetermined refrigerant pipe is passed through the through-hole, and then expanded to obtain a sufficient binding force. The cross fin type heat exchanger having a one-stroke structure refrigerant pipe without a joint, which obtains the fins, is independent of each other, so if the fastening force between the fins and the refrigerant pipes is reduced, the fins may not be loosened. There was a problem that rotation occurred, leading to deterioration of heat exchange performance. In addition, in the case of independent fins, there is a problem that it is difficult to adopt a measure for increasing heat exchange performance by providing a slit or the like.
[0007]
In order to solve these problems, in a cross fin type heat exchanger with a single-stroke structure refrigerant pipe without a joint, the notch or turn is added to the independent fin to reduce the loosening and rotation of the fin. A method of preventing heat and increasing heat exchange performance can be considered. SUMMARY OF THE INVENTION An object of the present invention is to provide a heat exchanger in which the number of joints is reduced as much as possible to improve the reliability against refrigerant leakage, and there is no heat exchange performance deterioration factor due to the independent fin structure.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a cross fin type heat exchanger comprising a long refrigerant pipe in which one or a plurality of refrigerant pipes are arranged in parallel, and a plurality of fins arranged in parallel with a predetermined interval in a vertical direction of the refrigerant pipe. The exchanger has a structure in which only one refrigerant tube is in contact with one independent fin. The independent single fin may be provided with cuts to improve the heat exchange performance of the fin itself.
[0009]
Alternatively, for the purpose of increasing the heat transfer area or providing a predetermined interval between the fins joined to the adjacent refrigerant pipes to reduce the ventilation resistance, the outer edge of the independent fin is located at one place. This is a folded structure.
[0010]
Further, in order to improve the heat exchange performance of the fin itself or to prevent loosening or rotation of the independent fin, the independent fin has a structure in which four corners are folded back at one or more places. In this structure, one or more of the four corners of the independent fins arranged in parallel with the refrigerant pipe at predetermined intervals are folded back to contact or approach the adjacent fins, thereby improving the heat exchange performance of the fins and reducing looseness. It is also possible to prevent rotation.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
[0012]
FIG. 1 is a perspective view showing a cross-fin heat exchanger H according to one embodiment of the present invention. In FIG. 1A, the refrigerant pipe P is composed of eight straight portions Ps (not shown because it is partially shadowed by the fin F) and seven bent portions Pc1 to Pc7, which are alternately folded. To form a meandering shape in the same plane. The radiating fins F are attached to the straight line portion Ps of the refrigerant pipe P at regular intervals vertically to the refrigerant pipe P, and only one refrigerant pipe P contacts one independent fin F. It is characterized by doing.
[0013]
FIG. 1B is a variation of the embodiment of the present invention shown in FIG. 1A, and has a structure in which the pitch interval of the fins F joined to the linear portion Ps of the refrigerant pipe is arbitrarily set.
[0014]
In the embodiment of FIG. 1, the contact between the fin F and the refrigerant pipe P is performed by expanding the diameter of the refrigerant pipe P by internal pressure or mechanically expanding the pipe, or joining by external factors such as welding, brazing, bonding, and painting. There is a method. The refrigerant pipe P and the fins F are mainly made of a metal having high thermal conductivity such as copper, aluminum and their alloys, but may be made of iron, its alloys, and resins. Further, the refrigerant pipe P and the fin F may be made of the same material or different materials. Furthermore, a structure in which the fin F is joined to the bent portion Pc of the refrigerant pipe P can be designed.
[0015]
FIG. 2 is a perspective view showing a cross fin type heat exchanger H according to an embodiment of the present invention. In FIG. 2, the refrigerant pipe P is composed of eight straight portions Ps (not shown because it is partially shadowed by the fins F ') and seven bent portions Pc1 to Pc7. It has a meandering shape in the same plane. The radiating fins F ′ are attached to the linear portion Ps of the refrigerant pipe P vertically at regular intervals and are attached to the refrigerant pipe P. One refrigerant pipe P is provided for one independent fin F ′. It is characterized in that only contact is made. The refrigerant pipe P includes linear portions Ps1 and Ps2 of the refrigerant tube and a bent portion Pc of the refrigerant tube. The linear portions Ps1 and Ps2 of the refrigerant tube are provided with radiating fins F at regular intervals. The refrigerant pipes P are vertically arranged and attached to the pipes P, and only one refrigerant pipe P is in contact with one independent fin F ′. The fins F ′ are provided with cuts as shown in FIG. 2 so that the heat exchange performance of the fins can be improved. The shape of the cut can be a circle or a square, in addition to the triangle as shown in FIG.
[0016]
FIG. 3 shows an embodiment of the present invention. In FIG. 3, the refrigerant pipe P includes linear portions Ps1 and Ps2 of the refrigerant tube and a bent portion Pc of the refrigerant tube, and the linear portions Ps1 and Ps2 of the refrigerant tube have fixed fins F for radiation. Are arranged vertically at intervals of the refrigerant pipe P, and only one refrigerant pipe P is in contact with one independent fin F. The fin F includes a refrigerant pipe contact portion Fh and two bent portions Ff. By having the structure of the fin F as shown in FIG. 3, the heat transfer area of the fin F in a limited area can be increased, and in addition, the fin F in contact with the linear portion Ps1 of the refrigerant pipe, The fins F in contact with the linear portions Ps2 of the adjacent refrigerant pipes do not overlap, and the rotation of the fins F when the contact between the refrigerant pipes P and the fins F becomes weak is prevented. By continuously arranging one embodiment of the present invention shown in FIG. 3, a planar heat exchanger structure using a meandering refrigerant pipe P can be formed as shown in FIG.
[0017]
FIG. 4 shows an embodiment of the present invention. In FIG. 4, the refrigerant pipe P includes linear parts Ps1 and Ps2 of the refrigerant pipe and a bent part Pc of the refrigerant pipe. The linear parts Ps1 and Ps2 of the refrigerant pipe are provided with radiating fins F ′. The refrigerant pipes P are vertically arranged at regular intervals, and only one refrigerant pipe P is in contact with one independent fin F. The fin F 'is composed of a refrigerant pipe contact portion Fh' and four bent portions Ff '. When the fin F has a structure as shown in FIG. 4, the heat exchange performance of the fin F ′ can be improved, and in addition, the fin F ′ in contact with the linear portion Ps1 of the refrigerant tube and the refrigerant tube adjacent thereto And the fin F ′ in contact with the linear portion Ps2 does not overlap, and has an effect of preventing rotation of the fin F ′ when the contact between the refrigerant pipe P and the fin F ′ becomes loose. By continuously arranging the embodiment of the present invention shown in FIG. 4, a planar heat exchanger structure using a meandering refrigerant pipe P as shown in FIG. 1 can be obtained.
[0018]
In the heat exchanger shown in FIGS. 1 to 4, first, fins F are attached at predetermined intervals to a predetermined location of a long straight refrigerant pipe P at predetermined pitch intervals, and later, at predetermined locations of the refrigerant pipe P in a predetermined direction. It can be manufactured by a method of forming a straight portion Ps and a bent portion Pc of the refrigerant pipe by bending.
[0019]
FIG. 5 is a partial perspective view of a refrigerator equipped with the heat exchanger H of the present invention. This figure shows the lower part of the refrigerator viewed from the back, and shows a structure in which a refrigerant condensation cycle system is mounted in a space surrounded by side plates M1, M2, a bottom plate M3, and an evaporating dish E. The heat exchanger H according to the present invention, which includes the refrigerant pipe P and the fins F, passes the refrigerant compressed by the compressor C through the refrigerant pipe P and radiates heat in the heat exchanger H. The amount of heat radiated in the heat exchanger H is caused to flow to the outside world by forced convection of air generated by the fan V.
[0020]
The heat exchanger of the present invention is applicable to an evaporation cycle inside a refrigerator, a heat exchanger of an air conditioner, and a heat exchanger of a refrigerator or a dehumidifier in addition to the condensation cycle on the back of the refrigerator shown in FIG.
[0021]
According to the embodiment described above, it is possible to provide a heat exchanger in which the number of joints is reduced as much as possible and the reliability with respect to refrigerant leakage is increased while maintaining the heat exchange performance and the heat transfer performance with the conventional heat exchanger. Further, by setting the minimum necessary fin structure to one unit, the degree of freedom in designing and manufacturing the heat exchanger can be increased.
[0022]
【The invention's effect】
In the heat exchanger of the present invention, the seam is reduced as much as possible to improve the airtight reliability, and furthermore, the heat exchange performance is prevented from deteriorating due to the single independent fin structure, and the heat exchange performance is higher than that of the conventional heat exchanger. This has the effect of providing a heat exchanger maintaining the above. Thus, even when a hydrocarbon-based flammable refrigerant is used, there is an effect that product reliability can be improved. In addition, by forming a minimum necessary fin structure as one unit and performing three-dimensional bending, a heat exchanger having an arbitrary shape can be manufactured, and there is an effect that a heat exchanger having a high degree of design flexibility can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a cross-fin type heat exchanger according to an embodiment of the present invention; FIG. 2 is a perspective view showing a cross-fin type heat exchanger according to an embodiment of the present invention; FIG. FIG. 4 is a partial perspective view showing a variation of one embodiment of the present invention. FIG. 5 is a partial perspective view of a refrigerator equipped with a heat exchanger of the present invention. ]
F: fin, P: refrigerant pipe, H: heat exchanger, Pc: bent part of refrigerant pipe, Ps: linear part of refrigerant pipe

Claims (5)

In a cross-fin type heat exchanger composed of one or more long refrigerant pipes arranged in parallel and a plurality of fins arranged in parallel at predetermined intervals in the vertical direction of the refrigerant pipe, one independent The heat exchanger wherein only one refrigerant tube is in contact with the fin. In a cross-fin type heat exchanger composed of one or more long refrigerant pipes arranged in parallel and a plurality of fins arranged in parallel at predetermined intervals in the vertical direction of the refrigerant pipe, one independent The heat exchanger according to claim 1, wherein the heat exchanger has one or more cuts on the outer side of the fin. In a cross-fin type heat exchanger composed of one or more long refrigerant pipes arranged in parallel and a plurality of fins arranged in parallel at predetermined intervals in the vertical direction of the refrigerant pipe, one independent The heat exchanger according to claim 1 or 2, wherein the fin has a structure in which one or more outer sides are folded back. In a cross-fin type heat exchanger composed of one or more long refrigerant pipes arranged in parallel and a plurality of fins arranged in parallel at predetermined intervals in the vertical direction of the refrigerant pipe, one independent The heat exchanger according to claim 1 or 2, wherein the fin has a structure in which four corners are folded back at one or more places. A refrigerator, an air conditioner, and other refrigeration products, wherein the heat exchanger according to claim 1 is mounted as a condenser and an evaporator.

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