JP4423798B2 - Spiral fin fixing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to fixing of a fin and a refrigerant tube of a spiral fin tube type heat exchanger configured by spirally winding a fin material around the outer periphery of a refrigerant tube used as a heat transfer component such as a refrigerator or a showcase. It relates to the device.
[0002]
[Prior art]
In recent years, a spiral fin tube type heat exchanger made of metal fins spirally wound around a refrigerant pipe has been frequently used for refrigerators, showcases, etc. due to its high cost performance. There are a wide variety of manufacturing methods for spiral finned tube heat exchangers, but for small products such as refrigerators, a method in which continuous metal fins are directly wound around a straight refrigerant pipe in the vertical direction and both ends are fixed to the refrigerant pipe. The main method is to insert a refrigerant tube into a metal fin previously formed on the coil, spread it to a predetermined pitch, and fix both ends. In any method, if both ends of the fin are not fixed to the refrigerant pipe, a springback occurs due to residual stress when the fin is formed in a spiral shape, and the winding part loosens, so the adhesion between the refrigerant pipe and the fin deteriorates and heat exchange occurs. Since performance deteriorates, it is necessary to firmly fix both ends of the fin to the refrigerant pipe.
[0003]
As a conventional method for fixing a spiral fin, there is a fixing method in which a fin and a refrigerant tube are joined by a laser beam as disclosed in JP-A-10-166047. Hereinafter, a conventional method for fixing a spiral fin will be described with reference to the drawings.
[0004]
FIG. 11 is a perspective view of a conventional fixing method using laser light. In the figure, 1 is a fin, 2 is a refrigerant tube, and 6 is a laser emission barrel for irradiating laser light. In this fixing method, at the time of forming the fin 1, the fin start and end are irradiated with laser light from the laser emission barrel 6, and the contact portion between the fin 1 and the refrigerant tube 2 is continuously joined and fixed.
[0005]
As another fixing method, there is a fin fixing method using another component shown in FIG. In the figure, 7 is a fixing part, 8 is a spot welding location, and 9 is a caulking location. In this fixing method, as shown in the figure, the fixing component 7 is attached around the refrigerant pipe 2, and the fin 1 and the fixing component 7 are joined by spot-welding the end of the fin to the spot welding spot 8, Furthermore, the fin 1 is fixed to the refrigerant pipe 2 by caulking the refrigerant pipe 2 and the fixing part 7 at the caulking location 9.
[0006]
[Problems to be solved by the invention]
However, with regard to the fixing method using the laser beam described above, laser bonding is possible only when the material of the fin and the refrigerant tube is both an iron material, and normal bonding is not possible when a constituent material other than iron material is used. There was a drawback that could not.
[0007]
In the fixing method using the fixing parts, initial processing is performed in a shape in which the fins are wound one or more times in advance, and after mounting the processed fins on the refrigerant pipe, the fixing parts are further attached by spot welding and caulking. Fix the fin and the refrigerant pipe. After that, fins are wound around the refrigerant pipe, so fin initial processing, fixing component mounting processing, and fin winding processing are separate processes, and it is necessary to transfer between each process. There is a drawback that the manufacturing cost is increased because of the lowering of the height and the use of fixing parts.
[0008]
In order to solve the above-mentioned problems, the present invention takes into account the drawbacks of the prior art, enables strong fixing without being affected by the constituent materials of the heat exchanger, and maintains the close contact between the fins and the refrigerant pipe to improve the heat exchanger performance. An object of the present invention is to provide a fixing device for a spiral fin that prevents the lowering and improves the working efficiency in fixing the fin and the refrigerant pipe and reduces the manufacturing cost.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is a fin engaging portion provided in a duct in a refrigerator, a showcase or the like for mounting a spiral fin tube type heat exchanger having a fin wound spirally around the outer periphery of a refrigerant pipe. The fin and the refrigerant pipe are fixed by sandwiching the fin.
[0010]
This makes it possible to fix the fin and the refrigerant pipe regardless of the constituent material of the fin and the refrigerant pipe, and at the time of attaching the spiral fin tube type heat exchanger to the duct of the refrigerator, the showcase, etc. Can be fixed and brought into close contact with each other at the same time, so that it is possible to easily fix the fins and the refrigerant pipes without the need for separate fixing parts or fixing equipment.
[0011]
The invention according to claim 2 is that the fin engaging portion according to claim 1 is formed in a shape having an uneven portion on a contact surface with the fin horizontal to the refrigerant pipe, so that the fin stops at the uneven portion, so that the fin Movements such as displacement along the refrigerant pipe can be suppressed, and more secure fixation is possible.
[0012]
According to a third aspect of the present invention, in the fin engaging portion according to the first aspect, the fin contact surface has a semicircular arc shape that substantially matches the outer peripheral shape of the fin. As in the second aspect of the invention, it is possible to suppress the movement of the fins along the refrigerant pipe and the like, and the fin and the refrigerant pipe can be securely fixed.
[0013]
In the invention according to claim 4, since the fin end portion has a linear shape without being wound around the refrigerant pipe, the fin linear shape portion is brought into contact with the duct to rotate the fin in the outer circumferential direction by the spring back. Can be stopped, and the loosening of the fins can be prevented.
[0014]
According to the fifth aspect of the present invention, the fin end portion has a bent shape, and the fin bent shape portion is brought into contact with the duct so that the outer circumferential direction of the refrigerant pipe by the spring back of the fin is the same as the fourth aspect of the invention. Rotation can be stopped and fins can be prevented from loosening.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a fixing device for spiral fins according to the present invention will be described with reference to the drawings. In addition, about the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
[0016]
(Embodiment 1)
1 is a plan view of a spiral fin tube heat exchanger fixed in a duct of a refrigerator by a spiral fin fixing device according to Embodiment 1 of the present invention. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG.
[0017]
1, 2, and 3, reference numeral 3 denotes a spiral fin tube heat exchanger composed of a refrigerant pipe 2 and fins 1 spirally wound around the outer periphery thereof, and reference numeral 4 denotes the spiral fin tube heat exchanger. 3 is a duct mounted in a machine room such as a refrigerator or a showcase formed of a thermoplastic resin (for example, PP resin) to which 3 is attached. Reference numeral 5 denotes a fin engaging portion composed of a pair of sandwiching pieces 5 ′ standing at a predetermined interval on the duct in order to sandwich and closely contact the fin 1 and the refrigerant pipe 2 of the spiral fin tube type heat exchanger 3. . It is desirable that the interval between the holding pieces 5 ′ be slightly smaller than the outer diameter of the wound fin 1.
[0018]
The fin 1 is spirally wound around the outer periphery of the refrigerant tube 2, and then the spiral fin tube type heat exchanger 3 completed by being meandered into an arbitrary shape a plurality of times is integrally formed on the duct 4 with a diameter of the fin 1 It is attached so that it may be pinched | interposed into clamping part 5 'of the fin engaging part 5 provided with the following clearance gaps. Therefore, the fin 1 and the refrigerant pipe 2 are both sandwiched between the fin engaging portions and firmly adhered by the elasticity of the fin engaging portions 5 formed of thermoplastic resin. As a result, the fixing of the fin 1 and the refrigerant pipe 2 is not affected by the constituent metal material, and the fin 1 is firmly fixed, the fin winding portion is not loosened by the spring back of the fin 1, and the heat exchange performance is not deteriorated. Moreover, the effect can be heightened by providing the said fin engaging part in multiple places. Further, since the installation of the spiral fin tube type heat exchanger 3 to the duct 4 is to fix the fin 1 and the refrigerant pipe 2, no separate processing for fixing the fin 1 and the refrigerant pipe 2 is required. In addition, the fin and the refrigerant pipe can be easily firmly fixed.
[0019]
(Embodiment 2)
FIG. 4 is a plan view of a spiral fin fixing device according to Embodiment 2 of the present invention. In FIG. 4, reference numeral 10 denotes a concavo-convex portion provided on a contact surface of the sandwiching piece 5 ′ of the fin engaging portion 5 integrally formed on the duct 4 with the fin 1. When the fin 1 moves due to a deviation along the refrigerant pipe 2 by springback by continuously configuring the concave-convex portion 10 on the contact surface of the fin engaging portion 5, the fin 1 stops at the concave-convex portion 10, The freedom of the said fin 1 can be suppressed and generation | occurrence | production of the loosening of a fin winding part can be prevented. Therefore, in addition to the fixing of the fin engaging portion 5 by elasticity, the fin 1 and the refrigerant pipe 2 can be further fixed.
[0020]
(Embodiment 3)
FIG. 5 is a cross-sectional view of a spiral fin fixing device according to Embodiment 3 of the present invention. In FIG. 5, reference numeral 11 denotes a semi-arc shaped fin contact surface that substantially matches the outer circumferential shape of the fin in the pinching portion 5 ′ of the fin engaging portion 5. By configuring the semicircular arc-shaped contact surface 11, the contact area with the fin 1 can be increased and the contact resistance can be increased, so that the freedom of the fin 1 can be suppressed and the occurrence of loosening of the fin winding portion can be prevented. it can. Therefore, in addition to the fixing of the fin engaging portion 5 by elasticity, the fin 1 and the refrigerant pipe 2 can be further fixed.
[0021]
(Embodiment 4)
FIG. 6 is a cross-sectional view of a spiral fin fixing device according to Embodiment 4 of the present invention. In FIG. 6, reference numeral 12 denotes a fin linear shape portion obtained by leaving only the end portion of the fin 1 around the refrigerant pipe and leaving a straight shape. By forming the fin linear shape portion, the fin linear shape portion 12 contacts the fin engaging portion 5 integrally formed on the duct 4 when the fin 1 rotates in the circumferential direction of the refrigerant pipe by springback. Since the rotation stops, the occurrence of loosening of the fin winding portion due to the rotation of the fin 1 can be prevented.
[0022]
(Embodiment 5)
7 and 9 are plan views of a spiral fin fixing device according to Embodiment 5 of the present invention. 8 is a cross-sectional view taken along the line CC ′ of FIG. 7, and FIG. 10 is a cross-sectional view taken along the line DD ′ of FIG. In the figure, reference numeral 13 denotes a fin bent shape portion in which the fin winding end portion is bent at a substantially right angle. By providing the bent shape portion 13 and providing the fin engaging portion 5 integrally formed on the duct 4 so as to be in contact with the fin bent shape portion 13, the contents similar to those described in the fourth embodiment are described. When the fin 1 rotates in the circumferential direction of the refrigerant pipe by the spring back, the fin linear shape portion 12 comes into contact with the fin engaging portion 5 integrally formed on the duct 4 and stops rotating. It is possible to prevent occurrence of loosening of the fin wrapping portion due to.
[0023]
【The invention's effect】
As described above, the invention according to claim 1 fixes the fin and the refrigerant pipe by the fin engaging portion provided in the duct of a refrigerator, a showcase or the like to which the spiral fin tube type heat exchanger is attached. It is not affected by the constituent materials, and does not require equipment for fixing the fins and the refrigerant pipes. Also, the fixing work time of the fins and the refrigerant pipes can be shortened, and the heat exchange performance is prevented from deteriorating by preventing the fins from loosening. In addition, the manufacturing cost can be reduced.
[0024]
In addition to the invention described in claim 1, the invention described in claim 2 is provided with an uneven portion on the surface in contact with the fin, thereby preventing the fin from being displaced along the refrigerant pipe and the like more firmly. And the refrigerant pipe can be fixed.
[0025]
In addition to the invention described in claim 1, the invention described in claim 3 has a semicircular arc shape in which the fin contact surface substantially matches the outer peripheral shape of the fin, thereby increasing the contact resistance and along the fin refrigerant pipe. Misalignment and the like are prevented, and the fin and the refrigerant pipe can be more firmly fixed.
[0026]
In addition to the invention described in claim 1, the invention described in claim 4 has a linear shape at the fin end, and can prevent rotation of the fin due to spring back by contact with the duct and prevent loosening of the fin. .
[0027]
In addition to the invention of claim 1, the invention of claim 5 has a bent shape at the end of the fin, prevents rotation of the fin due to springback by contact with the duct, and prevents loosening of the fin. .
[Brief description of the drawings]
FIG. 1 is a plan view of a spiral fin tube type heat exchanger fixed in a duct of a refrigerator by a spiral fin fixing device according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of a portion A in FIG. 2 is a cross-sectional view taken along line BB in FIG. 2. FIG. 4 is a plan view of a spiral fin fixing device according to a second embodiment of the present invention. FIG. 5 is a cross-sectional view of a spiral fin fixing device according to a third embodiment of the present invention. FIG. 7 is a cross-sectional view of a spiral fin fixing device according to a fourth embodiment of the present invention. FIG. 7 is a plan view of a spiral fin fixing device according to a fifth embodiment of the present invention. 9 is a plan view of a spiral fin fixing device according to Embodiment 5 of the present invention. FIG. 10 is a cross-sectional view taken along the line DD in FIG. 9. FIG. 11 is a perspective view of a conventional fixing method using laser light. FIG. 12 is a diagram using a conventional part with another part. Perspective view of a fixing method EXPLANATION OF REFERENCE NUMERALS
DESCRIPTION OF SYMBOLS 1 Fin 2 Refrigerant tube 3 Spiral fin tube type heat exchanger 4 Duct 5 Fin engaging part 5 'Clamping piece 6 Laser emission barrel 7 Fixing part 8 Spot welding part 9 Caulking part 10 Concavity and convexity part 11 Fin contact surface 12 Fin straight line Shape part 13 Fin bent shape part

Claims (5)

When a spiral fin tube type heat exchanger composed of a refrigerant pipe and fins wound spirally around the outer periphery thereof is installed in a duct in a refrigerator, a showcase or the like, a pair of sandwiched gaps having a predetermined interval is provided in the duct. A spiral fin that is provided with a fin-engaging portion made of a piece, and that causes the fin and the refrigerant tube to be sandwiched by a sandwiching piece of the fin-engaging portion so that the spiral fin is tightly fixed to the refrigerant tube. Fixing device. 2. The fixing device for a spiral fin according to claim 1, wherein the sandwiching piece of the fin engaging portion has an uneven portion continuously on the contact surface with the fin. 3. The fixing device for a spiral fin according to claim 1, wherein the sandwiching piece of the fin engaging portion has a semicircular arc shape portion substantially matching the outer peripheral shape of the fin on a contact surface with the fin. The fixing device for a spiral fin according to any one of claims 1 to 3, wherein an end portion of the fin has a linear shape without being wound around the refrigerant pipe. The end portion of the fin has a bent shape, and the fixing device for the spiral fin according to any one of claims 1 to 4.

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