KR20010029165A - Manufacturing method for tri-tube type evaporator of refrigerator - Google Patents

Abstract

PURPOSE: A method for manufacturing integrated type evaporator for refrigerator is provided to achieve an improved performance of refrigerator by avoiding clogging of the refrigerant flowing within the refrigerant pipe. CONSTITUTION: A method comprises the steps of forming an evaporator where a refrigerant pipe, a defrost pipe and a radiation fin are incorporated into a single unit; and bending the evaporator at a predetermined space. The refrigerant pipe has a cross section shaped as an ellipsoidal in the step of forming the evaporator, and the evaporator is bent, through a bending unit, to allow the refrigerant to has a stabilized circular cross section in the step of bending the evaporator. The bending unit includes a main roller type jig(20) having a roller(22) with a pair of refrigerant pipe guide grooves formed at the outer periphery of the roller and a support rod(24) penetrating the roller so as to support the roller and which is installed to reciprocate in linear fashion; a pair of auxiliary roller type jigs(30) having a roller(32) and a support rod(34), respectively, and which are disposed to allow rollers(22,32) to contact with each other in accordance with the reciprocating motion of the main roller type jig; and an actuator for actuating the main roller type jig.

Description

Manufacture method of integrated evaporator for refrigerator {MANUFACTURING METHOD FOR TRI-TUBE TYPE EVAPORATOR OF REFRIGERATOR}

The present invention relates to an evaporator for a refrigerator, and more particularly, to a method for manufacturing an integrated evaporator for a refrigerator to improve the flow efficiency of the refrigerant by forming a stable circular section at a bending part.

In general, a refrigerator is used for freezing food or storing food in a refrigerator, and a case for forming a storage space separated into a freezer compartment and a refrigerating compartment, and mounted on one side of the case to open and close the freezer compartment and the refrigerating compartment. It comprises a door, a device for lowering the temperature of the freezer compartment and the refrigerating chamber by forming a refrigeration cycle, such as a condenser and evaporator of the compressor.

In such a refrigerator, a low temperature low pressure gaseous refrigerant is compressed to high temperature and high pressure, and the compressed high temperature high pressure gas phase refrigerant is cooled and condensed as it passes through a condenser to be converted into a high pressure liquid phase. The temperature and pressure are lowered while passing through, and the evaporator continues to change into a low-temperature, low-pressure gas state, taking heat from the surroundings to cool the air around it. The air cooled through the evaporator is circulated into the freezing and refrigerating compartment by the operation of a blower fan, thereby lowering the temperature of the freezing compartment and the refrigerating compartment.

Here, the evaporator is composed of a refrigerant pipe through which the refrigerant flows, a defrost pipe for removing frost formed on the refrigerant pipe, and a heat dissipation fin for widening the heat dissipation area of the refrigerant pipe. It is roughly classified into a fin tube type and a tri tube type.

The fin tube-type evaporator is a continuous steel pipe is continuously bent in the form of '′' and the refrigerant pipe is formed in a kind of multiple layers, and a plurality of refrigerant pipes are arranged in parallel at regular intervals and are welded. It is attached to the, and is formed in a thin panel heat radiation fin that is mounted in a form that crosses the seemingly bent refrigerant pipe, and bent along the refrigerant pipe in a state in contact with the heat radiation fin, the heating element is provided therein It is made of defrosting.

In addition, the integrated evaporator was developed to prevent a decrease in fabrication efficiency and heat dissipation efficiency caused by the structure of the fin tube type evaporator. As shown in FIG. 1, a pair of refrigerant tubes 12 and 12 and the two refrigerant tubes And a heat dissipation fin (16) integrally formed in the form of connecting the defrost pipe (14) located between the (12) and (12), and the respective refrigerant pipes (12) and (12) and the defrost pipe (14). . Here, the refrigerant pipe 12, the defrost pipe 14 and the heat dissipation fin (16) is bent to form a continuous' ′ form, the heat dissipation fin (16) is provided with a plurality of ventilation holes in series and the The louvers 17 are formed in a continuous shape so that the air passing through the vents forms turbulent flows by forming openings having different directions from the bottom up, and the louvers 17 have a defrosting tube so that more powerful turbulence is formed. It may be made to face in opposite directions based on 14).

Therefore, such an integrated evaporator has a higher manufacturing efficiency than a fin tube type evaporator which is manufactured by attaching a plurality of heat dissipation fins to a refrigerant tube by welding or mechanical expansion, and the contact between the refrigerant tube 12 and the heat dissipation fins 16. Since the sites are formed continuously, the heat dissipation efficiency is also high.

On the other hand, the manufacturing process of manufacturing a conventional integrated evaporator for a refrigerator as described above is formed by integrally molding both refrigerant pipes 12, 12, defrost pipes 14 and the heat radiation fins 16 by extrusion molding or the like. And a bending step of partially bending the evaporator 10 which is formed in a substantially straight line through this forming step. In the bending step, a jig having a simple structure in which a surface in contact with the workpiece is usually formed in a planar shape is shown. By bending the evaporator 10.

According to this conventional technology, since the cross section of the refrigerant pipe 12 is formed to have a circular shape, the curved surface bent in contact with the jig is pressed by the jig and pressed, and the opposite surface is slightly tensioned. As shown in FIG. 2, irregularly distorted cross-sectional area is reduced.

In addition, as described above, in the curved portion of the refrigerant pipe 12 which is irregularly distorted and has a reduced cross-sectional area, turbulence occurs during the flow of the coolant, thereby reducing the fluidity of the coolant. There is a problem that causes one.

The present invention has been made to solve the above-mentioned conventional problems, the cross-sectional shape of the refrigerant pipe as a whole oval, and during the bending operation, the refrigerant pipe by maintaining the overall cross-sectional area of the refrigerant pipe is not reduced in the cross-sectional area at the curved portion of the refrigerant It is an object of the present invention to provide a method for manufacturing an integrated evaporator for a refrigerator which can prevent the fluidity of the resin from being lowered and, as a result, prevent the cooling efficiency of the refrigerator from falling.

1 is a perspective view showing the structure of a general integrated evaporator for a refrigerator.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

3 is a cross-sectional view showing the structure of an integrated evaporator for a refrigerator applied to an embodiment of the present invention.

Figure 4 is a perspective view showing the structure of the bending means applied to the embodiment of the present invention.

5 is a cross-sectional view taken along the line VV of FIG. 4.

6 is a state diagram showing a method of bending the integrated evaporator for a refrigerator using the bending means in the embodiment of the present invention.

7A and 7B are state diagrams illustrating a process of changing a cross-sectional shape of a refrigerant pipe according to an exemplary embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

10: integrated evaporator 12: refrigerant tube

14: defrosting pipe 16: heat dissipation fin

17: louver 20: main roller type jig

22: roller 22a: coolant pipe guide groove

22b: channel groove 22c: defroster guide groove

24: support rod 30: auxiliary roller type jig

Method for producing an integrated evaporator for a refrigerator provided to achieve the above object is to form an ellipse in the cross section of the refrigerant tube in the step of forming the evaporator combined with the refrigerant tube, the defrost tube and the heat radiation fins integrally;

In the step of bending the molded evaporator, a pair of coolant pipe guide grooves are formed along the outer circumferential surface and are rotatable so as to be positioned at predetermined intervals and have a semicircular cross-sectional shape that can cover the outer surface of the coolant pipe. A main roller-type jig composed of a supporting rod for supporting therethrough and installed in a linear reciprocating motion; A pair of auxiliary roller-type jig which is composed of a roller having the same shape as the main roller-type jig and a supporting rod rotatably supporting the roller, and disposed in a position where contact between the rollers is possible according to the reciprocating motion of the main roller-type jig. Wow; It is characterized in that the curved section of the coolant pipe has a stable circular shape through bending means including an actuator for driving the main roller jig.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 3 to 7B, and the same reference numerals will be given to the same parts as in the prior art, and the description thereof will be omitted.

First, according to the method of manufacturing an integrated evaporator for a refrigerator according to an embodiment of the present invention, in the forming step of forming an evaporator, as shown in FIG. 3, the refrigerant pipe 12 is formed to have an elliptical cross section. The shape of the ellipse formed by the cross-section of the) is to be made in the form of a longitudinal light narrowing (이) wide width of the top and bottom and narrow width on the basis of the heat radiation fin (16) in the drawing. On the other hand, the defrost pipe 14, the heat dissipation fin 16 and the louver 17 is to be maintained in the same form as the conventional.

Here, the reason for forming the coolant pipe 12 so that the cross-sectional shape is an ellipse is to induce the cross section of the coolant pipe 12 to be changed into a round shape in a bending operation to be described later.

Subsequently, the evaporator 10 formed as described above is bent through bending means to maintain a stable cross-sectional shape without irregular distortion even in a curved portion where the cross-sectional area of the refrigerant pipe 12 is bent.

Here, the bending means is one main roller jig 20, a pair of auxiliary roller jig 30 made of the same structure as the main roller jig 20, and the main as shown in FIG. It consists of an actuator (not shown) for driving the roller jig 20, the main roller jig 20 is associated with the actuator to enable reciprocating linear motion, each auxiliary roller jig 30, 30 is It is fixedly installed.

And, each of the roller jig 20, 30 is composed of rollers 22, 32, and support rods 24, 34 for rotatably supporting the rollers 22, 32, respectively, Each of the rollers 22 and 32 is a pair of semicircular cross sections which are spaced apart from each other along the outer circumferential surface at predetermined intervals as shown in FIG. 5 and which can cover the outer surface of the refrigerant pipe 10 (see FIG. 7A). Coolant pipe guide grooves 22a and 22a are formed, and a pair of channel grooves 22b and 22b are formed between the coolant pipe guide grooves 22a and 22a. The defrosting tube guide groove 22c is formed between 22b and 22b. The channel groove 22b has a size that allows the formation of a free space to avoid contact with the louver 17 in a state where each roller 22, 32 is in contact with each other (see Fig. 7b), the defrosting pipe guide The groove 22c is formed in a substantially circular shape that can maintain the shape of the defrosting pipe 14 also when the evaporator 10 is bent.

According to the bending means as described above, the linear evaporator is positioned between the main roller type jig 20 and the two auxiliary roller type jigs 30 and 30, as shown in FIG. 6, and then the actuator is operated to operate the main evaporator. The roller jig 20 is reciprocated so as to be in contact with both auxiliary roller jig 30 and 30, and at the same time, both ends of the evaporator 10 are bent to be bent around the main roller jig 20.

In this way, the refrigerant pipe 12 at the bending part of the evaporator 10, that is, the area in contact with the main roller jig 20, is bent along the outer peripheral surface of the roller 22 of the main roller jig 20, and is symmetrical. It is press-molded between the roller 22 of the main roller-type jig 20 and the roller 32 of the auxiliary roller-type jig 30 which contact | contacts and press-contacts mutually. Here, the cross section of the curved portion of the coolant pipe 12 is a combination of the coolant pipe guide grooves 22a and 32a formed in each of the rollers 22 and 32, and as shown in FIG. 7B in an elliptical shape as shown in FIG. 7A. It is changed to a round shape, and the cross-sectional shape of the refrigerant pipe 12 does not distort irregularly even in a curved portion to form an accurate roundness.

In addition, in the embodiment of the present invention, as described above, the main roller jig 20 is repeatedly moved by the actuator, and each roller 22, 32 is rotatable by the supporting rods 24, 34. Since it is in the supported state, by adjusting the bending portion pressed by the rollers 22 and 32 in a manner of moving the evaporator 10 slightly during the bending process, various curved portions in a range in which the radius of curvature is larger than the radius of the roller 22. It is possible to bend the evaporator 10 to have.

Therefore, according to the method of manufacturing the integrated evaporator for a refrigerator according to the embodiment of the present invention as described above, since the cross section of the curved portion of the evaporator 10 is formed in a stable round shape, the flow of the refrigerant flowing in the refrigerant pipe 12 is Turbulent flow is not formed even at the curved portion of the coolant pipe 12.

In addition, in the present invention as described above, the louver 17 of the heat dissipation fin 16 during the bending operation of the evaporator 10 is formed by the channel grooves 22b and 32b of each roller 22 and 32 symmetrically contacting each other. Since the shape is not changed because it is located in the free space, since the curved portion of the defrosting pipe 14 is supported in the defrosting pipe guide groove 22c, it maintains the same cross-sectional shape as the other parts.

According to the method of manufacturing an integrated evaporator for a refrigerator according to the present invention, when the refrigerant pipe is bent, the curved section of the refrigerant pipe may be irregularly distorted to achieve a stable round shape. Therefore, the flow of the refrigerant flowing in the refrigerant pipe is partially blocked, thereby preventing the phenomenon in which the fluidity of the refrigerant is lowered, and as a result, it is helpful to improve the performance of the refrigerator.

Claims (2)

Forming an evaporator in which both refrigerant pipes, defrost pipes, and heat dissipation fins are integrally formed, and sequentially bending the evaporator composed of a combination of both refrigerant pipes, defrost pipes, and heat dissipation fins at regular intervals. In the evaporator manufacturing method, In the forming step, the cross section of the refrigerant pipe 12 to form an elliptical shape, Method for producing an integrated evaporator for a refrigerator, characterized in that for bending the cross section of the curved portion of the refrigerant pipe (12) to form a stable round shape through the bending means in the bending step. The method of claim 1, The bending means Roller 22 and a pair of coolant pipe guide grooves 22a and 22a which are positioned at predetermined intervals and have a semicircular cross section so as to cover the outer surface of the coolant pipe 12, and the roller ( A main roller jig 20 configured of a supporting rod 24 rotatably supporting 22 to be rotatably installed; It is composed of a roller 32 having the same shape as the main roller jig 20 and a supporting rod 34 rotatably supporting the roller 32, and the rollers in accordance with the reciprocating motion of the main roller jig 20. A pair of auxiliary roller-type jig 30 disposed at a position where contact between (22) and (32) is possible; Actuator for driving the main roller jig 20 Method for producing an integrated evaporator for a refrigerator, characterized in that comprises a.