JP2006170506A - Fin and tube type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fin and tube type heat exchanger superior in unit attachment work preventing coating puddles even when a dip coating method exercising an anticorrosive effect is applied to the fin and tube type heat exchanger used in a refrigerator or the like. <P>SOLUTION: The fin and tube type heat exchanger is provided with a multiplicity of fins 13 arranged in parallel with each other at certain intervals, attachment plates 15 arranged in parallel with each other on both sides of the fin 13, U-shaped tubes 12 perpendicularly inserted in the fins 13 and passing a fluid through interiors, and return bends 14 connecting the U-shaped tubes 12. It is superior in unit attachment work preventing coating puddles 19 by a shape of an upper part bent face 16 of the attachment plate 15 even when baking finish of a rustproofing coating which is thermosetting resin is carried out on the whole surface by the dip coating method or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fin-and-tube heat exchanger used for a refrigerator or the like.

  Conventionally, fin-and-tube heat exchangers (evaporators) for refrigerators have been exposed to the atmosphere in the cabinet, and commercial refrigerators in particular have a large amount of food that generates highly corrosive gas in the cabinet. Compared to household refrigerators, food is often unwrapped, so corrosive gas is likely to be generated. For example, sulfur-based gas is generated from eggs, mayonnaise, cheese, seafood, and the like, and carboxylic acids (organic acids such as acetic acid and formic acid) are generated from mayonnaise, sauce, baker's yeast, and the like. In addition, when food rots, proteins and fats and other organic substances possessed by the food itself undergo oxidative decomposition and hydrolysis, generating sulfur-based gas, carboxylic acid, ammonia gas, and ethylene gas.

  Recently, bleaching agents, bactericides, or alcohol for disinfection have been used more frequently than the problem of pathogenic E. coli O-157. Bleaching agents and disinfectants use sodium hypochlorite and generate chlorine-based gases. Disinfecting alcohol generates carboxylic acid by oxidative decomposition. Thus, corrosive gas enters the inside of the refrigerator from the outside of the refrigerator when the refrigerator door is opened and closed.

  If the interior is exposed to the corrosive environment as described above, sulfur, which is a corrosion medium, carboxylic acid such as formic acid or acetic acid, chlorine, etc., dissolves in the condensed water generated when the refrigerator is cooled, and further defrosts. This causes repeated drying and wetting, and corrosion of fins and tubes begins. When corrosion begins, corrosion products such as white rust, black rust and patina are generated. When such a corrosion product is generated, the corrosion product is peeled off and blown off by the wind from the fan, and there is a problem that the product value is lost by adhering to the food in the warehouse. Further, when the corrosion is accelerated, the tube is pitted due to the action of the corrosion cell, eventually leading to a refrigerant gas leak, leading to a fatal defect that the tube cannot be cooled.

  Conventionally, as a technique for preventing the corrosion of the fin-and-tube heat exchanger as described above, a rust preventive paint, which is a thermosetting resin, is mainly applied to the entire surface of the heat exchanger after the heat exchanger is assembled.

  The conventional fin-and-tube heat exchanger will be described below with reference to the drawings.

  9 is a perspective view of a conventional fin-and-tube heat exchanger, FIG. 10 is a perspective view of a mounting plate of the conventional fin-and-tube heat exchanger, and FIG. 11 is a hanging of the conventional fin-and-tube heat exchanger. FIG. 12 is an explanatory view showing a state in which a conventional fin-and-tube heat exchanger and a fan guard are attached.

  As shown in FIG. 9, a conventional fin-and-tube heat exchanger 1 includes a large number of fins 3 arranged in parallel at regular intervals, and a mounting plate 5 arranged in parallel with the fins 3 interposed therebetween. The U-shaped tube 2 is provided with a U-shaped tube 2 through which fluid flows through the inside of the fin 2 inserted at a right angle and a return bend 4 that connects the U-shaped tubes 2 to each other, and the U-shaped tube 2 is expanded. Thus, the U-shaped tube 2 and the fin 3 are brought into close contact with each other, and further welded to connect the tip of the U-shaped tube 2 and the return bend 4 to form a circuit through which fluid flows.

  The fin-and-tube heat exchanger 1 is baked with a rust-proof paint, which is a thermosetting resin, on the entire surface by a dip coating method or the like, so that the U-shaped tube 2, the fin 3 and the return bend 4 have an anticorrosive effect. is there.

  As shown in FIG. 10, the bent surface 6a of the mounting plate 5 has a hanging hole 7 necessary for the dip coating method, and is provided at a position that is inclined with respect to the horizontal plane when the fin-and-tube heat exchanger is hung. It has been. The shape of the end face of the bending surface 6b is a right angle cut or the like.

  As shown in FIG. 11, in the dip coating method, when the hanger 8 is hung through the hanging hole 7 for painting provided on the bending surface 6 a of the mounting plate 5 of the fin-and-tube heat exchanger 1, the paint breaks. It is hung so as to be inclined with respect to the horizontal plane in order to improve and suppress the paint pool 9.

  The fin-and-tube heat exchanger 1 hung on the hanger 8 enters the paint tank, and until it is baked in the drying furnace in the next process, the paint gradually flows down in the direction of gravity. It remains on the bent surface 6b of the mounting plate 5 and the ends of the fins 3 etc. and is baked in a convex shape.

As shown in FIG. 12, in the fin-and-tube heat exchanger 1, the fan guard 10 as a unit part is attached with a screw 10a, but the fan guard is brought into close contact with the influence of the paint pool 9 on the bending surface 6b of the mounting plate 5. Since it is not possible, a process of attaching with a gap or removing the paint pool 9 is provided.
JP 2003-139485 A

  However, in the above-described conventional configuration, in the dip coating method, the suspended heat exchanger enters the paint tank, and while being baked in the drying furnace in the next process, the paint gradually flows down in the direction of gravity, and the paint that does not fall off is attached to the mounting plate. It is baked in a convex shape remaining on the ends of the fins and the like. By hanging the heat exchanger diagonally with respect to the horizontal plane, the paint pool can be reduced, but the convex paint pool cannot be eliminated.In particular, the convex paint pool remaining on the mounting plate It was difficult to install the fan guard, and it took time to remove the paint pool.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a fin-and-tube heat exchanger that does not require a paint pool removal operation.

  In order to solve the above-mentioned conventional problems, when the heat exchanger is hung with a hanger and slanted, the end shape of the bent surface located in the upper part of the mounting plate in the diagonally downward gravitational direction is made into a shape with good paint breakage. Thus, the fan guard mounting work for the unit parts is easy, and the need for the paint pool removing work is eliminated.

  The fin-and-tube heat exchanger according to the present invention is such that when the heat exchanger is hung with a hanger and slanted, the end portion in the gravity direction of the bending surface located at the upper part of the mounting plate is made into a shape with good paint breakage. Therefore, it is easy to install the fan guard of the unit parts, and it is not necessary to remove the paint pool.

  According to the first aspect of the present invention, a large number of fins arranged in parallel at regular intervals, a mounting plate arranged in parallel so as to sandwich the fins, and inserted at right angles to the fins A heat exchanger comprising a U-shaped tube through which a fluid flows and a return bend connecting the U-shaped tube, wherein the mounting plate is bent to coat the surface of the heat exchanger. In order to prevent paint from accumulating when a hanger is passed through a hanging hole provided on the surface and slanted with respect to the horizontal plane, the bending surface located above the hanging surface of the mounting plate is diagonally below. It is a fin-and-tube heat exchanger characterized by processing the end shape in the direction of gravity, and the fan guard mounting operation of the unit parts is easy and the operation of removing the paint pool is not necessary.

  In the invention according to claim 2 of the present invention, the end shape in the obliquely downward gravity direction of the bending surface located above the hanging of the mounting plate is obliquely cut, and the cut portion is returned to the inside. It has a shape, so that the fan guard can be easily attached to the unit parts and there is no need to remove the paint pool.

  In the invention according to claim 3 of the present invention, the end shape of the bending surface located in the upper part with respect to the hanging of the mounting plate is cut in an R direction, and the cut portion is returned to the inside. It has a shape, so that the fan guard can be easily attached to the unit parts and there is no need to remove the paint pool.

  In the invention according to claim 4 of the present invention, a rib is provided on the surface of the bending surface, which is located above the suspension of the mounting plate, in an obliquely downward gravity direction, and the end surface is turned inward. Therefore, it is easy to attach the fan guard to the unit parts and there is no need to remove the paint pool.

  The invention according to claim 5 of the present invention has a shape in which the end portion in the obliquely downward gravity direction of the bending surface located above the hanging of the mounting plate is bent, The fan guard can be easily attached and there is no need to remove the paint pool.

  The invention according to claim 6 of the present invention has a bent shape of 30 degrees at the end portion in the obliquely downward gravity direction of the bending surface located above the suspension of the mounting plate. The fan guard can be easily attached and there is no need to remove the paint pool.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a perspective view of a fin-and-tube heat exchanger according to Embodiment 1 of the present invention, FIG. 2 is a perspective view of a mounting plate of the fin-and-tube heat exchanger of the same embodiment, and FIG. FIG. 4 is an explanatory view showing an attachment state of the fin and tube heat exchanger and the fan guard of the embodiment.

  As shown in FIG. 1, the fin-and-tube heat exchanger 11 includes a large number of fins 13 arranged in parallel at regular intervals, a mounting plate 15 arranged in parallel with the fins 13 sandwiched therebetween, and fins 13. A U-shaped tube 12 in which fluid flows through the inside inserted at right angles to the inside, and a return bend 14 for connecting the U-shaped tubes 12 to each other, and by expanding the U-shaped tube 12, The letter-shaped tube 12 and the fin 13 are brought into close contact with each other, and further, a circuit is formed by welding to connect the tip of the U-shaped tube 12 and the return bend 14. The U-shaped tube 12, the fin 13 and the return bend 14 have an anticorrosive effect by applying a rust-proof paint, which is a thermosetting resin, to the entire surface of the fin-and-tube heat exchanger 11 by baking. .

  As shown in FIG. 2, the bent surface 16a of the mounting plate 15 has a hanging hole 17 necessary for the dip coating method, and is inclined with respect to the horizontal plane when the fin-and-tube heat exchanger 11 is hung. Is provided. The shape of the end surface located obliquely below the bending surface 16b is cut obliquely so that the cut portion is returned to the inside.

  As shown in FIG. 3, in the dip coating method, when the hanger 18 is hung through the hanging hole 17 for painting provided on the bending surface 16a of the mounting plate 15 of the fin-and-tube heat exchanger 11, the paint runs out. It is hung so as to be inclined with respect to a horizontal plane in order to improve and suppress the paint pool 19. The fin and tube type heat exchanger 11 hung on the hanger 18 enters the paint tank, and the paint gradually flows down in the direction of gravity until it is baked in the drying furnace in the next process, but the bending surface 16b of the mounting plate 15 Since the shape of the end face located diagonally below is cut obliquely and the cut portion is turned inward, the paint that flows down is not limited to flow and is baked, so that the paint pool 19 can be prevented.

  As shown in FIG. 4, the fin-and-tube heat exchanger 11 has the fan guard 10 as a unit part attached by screws 10a. However, since there is no paint pool 19, the attachment work can be performed smoothly. The working time can be shortened without 10 gaps.

  FIG. 5 is a perspective view of a mounting plate of another fin-and-tube heat exchanger of the same embodiment.

  As shown in FIG. 5, the bent surface 16a of the mounting plate 15 has a hanging hole 17 necessary for the dip coating method, and is inclined to the horizontal plane when the fin-and-tube heat exchanger 11 is hung. Is provided. The shape of the end surface located obliquely below the bending surface 16b is R-cut, and the cut portion is turned inward.

  FIG. 6 is a perspective view of a mounting plate of another fin-and-tube heat exchanger of the same embodiment.

  As shown in FIG. 6, the bent surface 16 a of the mounting plate 15 has a hanging hole 17 necessary for the dip coating method, and is inclined to the horizontal plane when the fin-and-tube heat exchanger 11 is hung. Is provided. A rib is provided on a surface located obliquely below the bending surface 16b, and the end surface is turned inward.

  FIG. 7 is a perspective view of a mounting plate of another fin-and-tube heat exchanger of the same embodiment.

  As shown in FIG. 7, the bent surface 16a of the mounting plate 15 has a hanging hole 17 necessary for the dip coating method, and is inclined with respect to the horizontal plane when the fin-and-tube heat exchanger 11 is hung. Is provided. The end surface located obliquely below the bending surface 16b has a bent shape.

  FIG. 8 is a perspective view of a mounting plate of another fin-and-tube heat exchanger of the same embodiment.

  As shown in FIG. 8, the bent surface 16 a of the mounting plate 15 has a hanging hole 17 necessary for the dip coating method, and is inclined with respect to the horizontal plane when the fin-and-tube heat exchanger 11 is hung. Is provided. The shape of the end surface located obliquely below the bending surface 16b is a 30 degree bending shape.

  As described above, the fin-and-tube heat exchanger according to the present invention can suppress the accumulation of paint by changing the shape of the bent surface of the mounting plate, and requires a coating. Suitable for unit assembly.

The perspective view of the fin and tube type heat exchanger by Embodiment 1 of this invention The perspective view of the attachment plate of the fin and tube type heat exchanger of the embodiment Explanatory drawing which shows the suspended state of the fin and tube type heat exchanger of the embodiment Explanatory drawing which shows the attachment state of the fin and tube type heat exchanger and fan guard of the embodiment The perspective view of the attachment plate of the other fin and tube type heat exchanger of the embodiment The perspective view of the attachment plate of the other fin and tube type heat exchanger of the embodiment The perspective view of the attachment plate of the other fin and tube type heat exchanger of the embodiment The perspective view of the attachment plate of the other fin and tube type heat exchanger of the embodiment A perspective view of a conventional fin-and-tube heat exchanger A perspective view of a conventional fin-and-tube heat exchanger mounting plate Explanatory drawing which shows the hanging state of the conventional fin and tube type heat exchanger Explanatory drawing which shows the attachment state of the conventional fin and tube type heat exchanger and fan guard

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Fin and tube type heat exchanger 12 U-shaped tube 13 Fin 14 Return bend 15 Mounting plate 16a, 16b Bending surface

Claims (6)

  A large number of fins arranged in parallel at regular intervals, a mounting plate arranged in parallel with the fins sandwiched therebetween, and a U-shaped tube in which fluid flows through the inside inserted at right angles to the fins A heat exchanger having a return bend for connecting the U-shaped tube, and a hanger in a hanging hole provided in a bent surface of the mounting plate for coating the surface of the heat exchanger The end shape of the bending surface located in the upper part of the bending surface located above the suspension of the mounting plate is processed so that the paint does not accumulate when suspended so as to be inclined with respect to the horizontal plane. Fin-and-tube heat exchanger.   The end portion of the bending surface located at the upper part with respect to the hanging of the mounting plate in an obliquely downward gravity direction is cut obliquely to form a shape in which the cut portion is returned to the inside of the bending surface. Item 2. A fin-and-tube heat exchanger according to item 1.   The end shape of the bending surface located at the upper part with respect to the hanging of the mounting plate in the obliquely downward gravity direction is R-cut, and the cut portion is shaped to return to the inside of the bending surface. Item 2. A fin-and-tube heat exchanger according to item 1.   2. The rib according to claim 1, wherein a rib is provided on a surface of the bending surface located at an upper portion with respect to the hanging of the mounting plate in an obliquely downward gravity direction, and an end surface is changed to an inner side of the bending surface. Fin-and-tube heat exchanger.   2. The fin and tube type according to claim 1, wherein the end portion of the bending surface located at an upper portion with respect to the hanging of the mounting plate is formed in a shape in which the end portion of the bending surface is bent inside the bending surface. Heat exchanger.   2. The fin and of claim 1, wherein a bending shape of 30 degrees is formed on the inner side of the bent surface at the end portion in the obliquely lower gravity direction of the bent surface located above the hanging of the mounting plate. Tube heat exchanger.

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