JP2003138399A - Coating system for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating system for heat exchangers with which the corrosion of a heat exchanger can be avoided beforehand. SOLUTION: The coating system 50 for coating coolers 8 as the heat exchangers by cation electrodeposition coating has a coating material vessel 61 which stores an electrodeposition coating material 60 and in which electric current is passed, suspension tools 54 which suspend the coolers 8 to immerse the same into the coating material vessel 1, and suspension members 51 and 51 which are attachably and detachably attached across tube plates 30 and 30 on both sides of the coolers 8. Engaging members 54B of the suspension tools 54 engage engaging holes 51A of the suspension members 51 and suspend the coolers 8. Electric current is passed to the coolers 8 through the suspension tools 54 and the suspension members 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating device for coating heat exchangers by cationic electrodeposition coating.

[0002]

2. Description of the Related Art In recent years, there has been a demand for cooling by a cooling unit in a bakery or a factory handling egg products.
Such a cooling unit is provided with a cooler as a heat exchanger and a blower for the cooler in an outer case, and constitutes a so-called refrigeration cycle with a separately installed compressor, condenser and the like.
Further, a discharge port is formed on the front surface of the outer case of the cooling unit, and a damper is rotatably supported on the discharge port at the upper edge of the discharge port so as to block the discharge port. Is hung. When the cooler blower is operated, cool air sucked into the outer case from the lower surface of the outer case is discharged from the discharge port via the cooler.

Such a cooling unit is arranged on the ceiling wall of a prefabricated cooling storage, for example, and the inside of the storage is cooled to a predetermined temperature by forcibly convection of cool air from the ceiling to the inside of the storage by a cooler blower. .

[0004]

However, when such a cooling unit as described above is installed in a bakery or a factory that handles egg products, the yeasts and cooked eggs handled in the factory may cause acetic acid gas or sulfite gas. Since a corrosive gas such as gas is generated, in a normal cooling unit, a cooler made of a metal such as iron is corroded immediately. Therefore, there are problems that the cooler itself deteriorates and the refrigerant leaks from the refrigerant pipe.

Therefore, in order to improve the anticorrosion property of the cooler itself, the paint is sprayed on the completed cooler by containing a paint containing an anticorrosive material. There was the inconvenience that uneven coating occurred in the screw holes for fixing to the unit.

Further, by changing the width dimension of the cooler after coating to move the tube sheet constituting the cooler, the coating film painted on the tube sheet is damaged and peeled off.

Therefore, due to uneven coating, damage to the coating film, etc., the details where the coating film is not formed or the peeled off portions are exposed to the corrosive gas such as the acetic acid gas or the sulfite gas, and the rust There is a problem of causing deterioration due to generation and corrosion.

Therefore, the present invention has been made in order to solve the conventional technical problems, and an object of the present invention is to provide a coating device for a heat exchanger capable of avoiding corrosion of the heat exchanger. And

[0009]

A coating apparatus for a heat exchanger according to the present invention is a coating apparatus for coating a heat exchanger by cationic electrodeposition coating, and a coating tank for storing coating material and a current flowing therethrough, It is equipped with a hanging jig for suspending the heat exchanger and immersing it in the paint tank, and a hanging member that is detachably attached across the tube plates on both sides of the heat exchanger. It is characterized in that the heat exchanger is suspended by being engaged with the member, and an electric current is passed through the heat exchanger through the suspending member.

According to the present invention, there is provided a coating device for coating a heat exchanger by cationic electrodeposition coating, which stores the coating material,
Equipped with a paint tank through which an electric current is passed, a hanging jig for hanging the heat exchanger and immersing it in the paint tank, and a hanging member detachably attached to the tube plates on both sides of the heat exchanger. , The suspension jig engages with the suspension member to suspend the heat exchanger, and current is passed through the suspension member to the heat exchanger, so that the heat exchanger can be easily coated. become.

Further, since the dimension between the tube sheets can be determined in advance by the suspending member, it is possible to prevent damage to the coating film due to the subsequent change in the dimension between the tube sheets. . Furthermore, since the dimensions between the tube sheets are determined, the workability after that can be improved, and it becomes possible to avoid variations in the finished dimensions of the heat exchanger.

According to a second aspect of the present invention, there is provided a heat exchanger coating apparatus.
In addition to the above-mentioned invention, the suspension member is characterized in that a plurality of engagement holes for engaging with the suspension jig are formed in the longitudinal direction.

According to the invention of claim 2, in addition to the above invention, the suspension member is formed with a plurality of engagement holes for engagement with the suspension jig over the longitudinal direction. , It becomes possible to engage a plurality of hanging jigs, whereby more current can be supplied and the coating efficiency can be improved.

The coating device for the heat exchanger according to the third aspect of the invention is
In addition to each of the above inventions, a protrusion protruding toward the tube sheet side is formed around a mounting hole for attaching the suspension member to the tube sheet.

According to the invention of claim 3, in addition to the above-mentioned inventions, since the projection portion protruding toward the tube sheet side is formed around the attachment hole for attaching the hanging member to the tube sheet, the hanging member is formed. When the is attached to the tube sheet, the protrusion and the tube sheet can be attached in contact with each other, and the contact surface between the suspension member and the tube sheet can be significantly reduced.

Thus, even when the heat exchanger is fixed by the suspension member, the contact surface with the suspension member can significantly reduce the unpainted portion of the heat exchanger. It becomes possible to avoid corrosion from the parts that are not exposed.

The coating device for the heat exchanger according to the invention of claim 4 is:
In addition to the invention of claim 3, the projection is characterized by being burred around the mounting hole.

According to the invention of claim 4, in addition to the invention of claim 3, since the projection is formed by burring around the mounting hole, the projection can be easily formed, The cost of the suspension member can be reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment to which the heat exchanger of the present invention is applied will be described in detail with reference to the drawings. 1 is a vertical sectional side view of a cooling storage R to which a cooler 8 as a heat exchanger according to the present invention is applied, FIG. 2 is a perspective view of a cooling unit 1 in which the cooler 8 of FIG. 1 is arranged, and FIG. 2 is a vertical side view of the cooling unit 1 of FIG. 2, and FIG. 4 is a perspective front view of the cooling unit 1 of FIG.

The cooling unit 1 in which the cooler 8 as the heat exchanger of the present invention is arranged is, for example, in a bread factory where a corrosive gas such as acetic acid gas or sulfite gas is generated by yeast or cooked eggs. It is used for cooling storage R such as prefabricated freezers and refrigerators installed in factories that handle egg products. The cooling storage R is composed of a heat insulating box 3, and a storage chamber 2 is formed in the heat insulating box 3. The heat insulating box 3 is formed in a box shape by combining a heat insulating panel 4 having a convex portion or a concave portion at a connecting portion with an adjacent panel.

Further, an article doorway for taking in and out articles such as stored foods is formed on the front wall of the heat insulating box body 3, and one side of the article doorway is rotatably supported at the article doorway. A heat insulating door 5 is provided that closes the storage chamber 2 while being openably and closably closed.

The cooling unit 1 is, for example, a heat insulating box 3
Is installed on the ceiling surface 3A on the side of the storage room 2 and is formed of a compressor, a condenser, etc., which is arranged in a separate outdoor unit (not shown) in an outer case 7 having a damper 6 formed on the front surface. Cooler 8 as a heat exchanger that constitutes a known refrigeration cycle with a cooling device, and a cooler 8 on the damper 6 side.
And a cooling blower 9 for discharging cool air. still,
The detailed structure of the cooler 8 and the coating device 50 for the heat exchanger of the present invention will be described later.

The cooler 8 is arranged on the damper 6 side, and the cooler blower 9 is arranged on the side of the cooler 8 and at the rear part of the cooling unit 1. In the figure, 14 is a fan case provided below the blower 9 for the cooler.

Below the cooler 8, a drain pan 16 having an opening on the upper surface is formed at the rear side, that is, on the side opposite to the damper 6, by bending the outer peripheral edge of the plate-shaped member upward at a substantially right angle. It is provided with a low inclination on the side of the air blower 9. A drain hole (not shown) is formed on the rear wall of the drain pan 16, and a drain pipe 17 as shown in FIGS. 3 and 4 is attached to the drain hole.

A drain hose 18 for discharging drain water received on the drain pan 16 to the outside is connected to the drain pipe 17. A hot gas pipe 19 for warming the drain water stored on the drain pan 16 is provided on the lower surface of the drain pan 16.

On the other hand, as shown in FIGS. 2 and 3, the outer case 7 is made of a plate-like member such as aluminum, and has a main body 10 having openings on both side surfaces, a lower surface and a front surface, and a lower surface opening of the main body 10 can be freely opened and closed. A frame cover 11 that closes the main body 10 and side plates 1 that close both side surfaces of the main body 10.
It is composed of 2 and 12.

The opening formed on the front surface of the outer case 7 serves as a discharge port 6A for discharging the cool air discharged from the cooler blower 9. Reference numeral 15 in FIGS. 3 and 4 denotes an airflow direction plate which is located between the cooler 8 and the damper 6 and is provided below the discharge port 6A, that is, in front of the lower part of the cooler 8. Further, the opening formed in the rear portion of the frame cover 11 has a cool air suction port 13 for sucking the cool air in the storage chamber 2 into the cooling unit 1 by the cooler blower 9.
It is said that

Further, the upper end of the side plate 12 is formed with a flange 22 whose outer periphery is bent inward. 1 in FIG.
Reference numeral 2B is a holding portion for holding a screw member (not shown) for fixing the cooling unit 1 to the top surface of the storage chamber 2. Side plate 1
2 are symmetrically formed, and the side plates 12 on both sides are configured as a common member.

Next, the structure of the cooler 8 as the heat exchanger as described above will be described with reference to FIG. FIG. 5 shows a perspective view of the cooler 8. The cooler 8 includes a pair of tube sheets 3
0, 30, a plurality of heat exchanging fins 32, and a refrigerant pipe 35. In this embodiment, it is assumed that the heat exchanger constituted by the tube plates 30, 30 and the like is connected in parallel by the connecting member 33 to constitute the cooler 8.

The refrigerant pipe 35 is made of a raw pipe made of a metal material such as iron. The tubular pipe 35A is formed by forming the raw pipe into a U shape in the longitudinal direction, and the end of the tubular member 35A. And a U-shaped member 35B that closes the portion. Then, the plurality of tubular members 35A
By alternately engaging the U-shaped member 35B with the U-shaped member 35B, the refrigerant pipe 35 is formed in a meandering shape.

The heat exchanging fins 32 are made of a thin plate-shaped aluminum plate, and a plurality of through holes (not shown) are formed in each of the fins 32.

On the other hand, the tube sheet 30 is composed of a plate member made of metal such as iron, and has one side end, that is,
At one side end located inward, a heater holding portion 34 that is horizontally cut from the inside toward the center of the tube sheet 30 is vertically arranged.
Is formed. The heater holder 34 is used for the cooler 8
This is for holding a defrosting heater (not shown) for heating the cooler 8 during defrosting.

Then, the heater holding portion 34 of the tube sheet 30.
On the outer peripheral edge where is not formed, a flange portion 30A that is bent outward at a substantially right angle is formed. The flange portion 30A constituting the side surface of the tube sheet 30 is detachably fixable to a fixing screw 52 for fixing the cooler 8 to the outer case 7 and a hanging member 51 described later. A plurality of members 53 are attached. Further, a plurality of through holes (not shown) are formed in the tube sheet 30, and the refrigerant pipe 35 is held by penetrating the refrigerant pipe 35 in the through holes. In addition, 40 shown in FIG. 5 is an intermediate tube sheet, and the strength of the cooler 8 is improved by providing the intermediate tube sheet.

Here, the procedure for assembling the cooler 8 will be described. First, after the tube plates 30 and 30 are opposed to each other, a plurality of heat exchanging fins 32 are arranged between the tube plates 30 and 30, and the tubular member 35A of the refrigerant pipe 35 is inserted from the through hole of one tube plate 30. , Through the through holes formed in the plurality of heat exchange fins 32, and further through the through holes formed in the other tube sheet 30. Then, after expanding the tubular member 35A of the refrigerant pipe 35 by an unillustrated refrigerant pipe expanding means, U-shaped members 35B are attached to the ends of the respective tubular members 35A so that the refrigerant pipe 35 becomes a meandering shape, and a burner Weld by heat such as. As a result, the cooler 8 before painting is completed.

Next, with reference to FIGS. 6 to 8, the coating device 50 for the heat exchanger of the present invention will be described. FIG. 6 is a perspective plan view of the cooler 8 with the suspension member 51 attached, FIG. 7 is a side view of the cooler 8 with the suspension member 51 attached, and FIG. 8 shows the heat exchanger of the present invention. It is explanatory drawing explaining the structure of the coating device 50.

When coating is performed as shown in FIGS. 6 and 7, the hanging member 51 is fixed to the cooler 8. The suspension member 51 is a plate-shaped member that is detachably attached to the upper part of each of the front and rear parts of the tube plates 30, 30 constituting the cooler 8, and the upper end thereof is substantially outward as shown in FIG. 7. It has a substantially L-shaped cross section bent at a right angle.

The hanging member 51 has a mounting hole (not shown) for detachably engaging with the fixing member 53 of the tube sheet 30 in the longitudinal direction on the surface contacting the tube sheet 30. Has been done. Around the attachment hole, as shown in FIG. 7, a protrusion 55 protruding toward the tube sheet 30 is formed. In this embodiment, the protrusion 55 is formed by burring around the mounting hole. Therefore, the protrusion 55 can be easily formed, and the cost of the hanging member 51 can be reduced.

On the other surface of the suspension member 51,
Plural, in the present embodiment, three engaging holes 51A for engaging with a hanging jig 54, which will be described in detail later, are formed in the longitudinal direction.

Further, both tube plates 3 constituting this cooler 8
A holding member 56 is attached to the lower part of each of the front and rear over 0 and 30. The holding member 56 is a plate-shaped member formed to extend in the longitudinal direction of the cooler 8 and has a substantially L-shaped cross section with its upper end bent outward at a substantially right angle.

The holding member 56 is detachably engaged with the fixing member 53 of the tube sheet 30 over the lengthwise direction on the surface contacting the tube sheet 30, like the hanging member 51. A mounting hole (not shown) is formed for this purpose. Around the mounting hole, a protrusion 57 is formed that protrudes toward the tube sheet 30 side similarly to the hanging member 51. In the present embodiment, the protrusion 57 as well as the protrusion 55 of the hanging member 51 is
It may be configured by burring around the mounting hole.

Next, the electrodeposition coating apparatus 50 will be described with reference to FIG. The electrodeposition coating device 50 is a device for coating heat exchangers such as the cooler 8 by so-called cationic electrodeposition coating, and includes a paint tank 61 for storing an electrodeposition paint 60 containing a corrosion-preventing material, and a paint tank concerned. A conveying device 62 that conveys the cooler 8 while being immersed in the paint tank 61 above 61, a power feeding member 63 provided in the conveying device 62, and a cooler 8 that supports the cooling device 8 while being in contact with the power feeding member 63. It is composed of a plurality of hanging jigs 54 that are carried into the electrodeposition paint 60 in the paint tank 61.

The transfer device 62 is assumed to be composed of two transfer rails provided in parallel with each other, and the power supply member 63 and the hanging jig 54 are provided on both transfer rails.

Further, the coating device 50 of the heat exchanger is provided with a voltage supply source (not shown). Since the coating device 50 of the heat exchanger of the present invention performs cationic electrodeposition coating, the negative electrode of the voltage supply source is connected to the power feeding member 63, and the anode of the voltage supply source is the coating tank 61. Electro-deposition paint 6
It is connected to an electrode (not shown) immersed in 0.

On the other hand, the suspending jig 54 is provided with a carrying device 62.
54A that is hung to be freely transported to
A plurality of engaging members 54B are suspended from the main body 54A, and a current flows to the engaging members 54B when the main body 54A contacts the power feeding member 63.

With the above structure, the engaging holes 5 of the suspension members 51 fixed to the front and rear upper portions of the cooler 8 respectively.
The engaging members 54B of the hanging jig 54 are engaged with 1A, respectively, and the cooler 8 is hung on the hanging jig 54. And
The cooling device 8 is immersed in the paint tank 61 in which the electrodeposition paint 60 is stored, while the hanging jig 54 is in contact with the power feeding member 63 by the carrying device 62. Therefore, an electric current flows through the cooler 8 via the hanging member 51 and the hanging jig 54.

At this time, since a direct current is applied between the electrodes in the electrodeposition coating material 61 in the coating material tank 61 as described above, the electrodeposition coating film is easily applied to the surface of the cooler 8. Can be formed. Further, since the cooler 8 performs painting by engaging the hanging members 51, 51 attached to the front and rear with the hanging jig 54, the cooler 8 can be painted while being held horizontally. At the same time, it becomes possible to pass an electric current from both front and rear sides of the cooler 8, and it is possible to significantly suppress uneven coating.

Further, a plurality of engaging members 54 of the hanging jig 54
Since B is engaged with the plurality of engagement holes 51A of the suspension member 51 attached to the cooler 8, the current from the power feeding member 63 is generated by the plurality of engagement members 54B of the suspension jig 51. It will flow to the cooler 8 via the. Therefore, more current can be supplied to the cooler 8 and the coating efficiency can be improved.

As described above, since the projection 55 protruding toward the tube sheet 30 is formed around the mounting hole for attaching the hanging member 51 to the tube sheet 30, the hanging member 51 and the tube sheet 3 are formed.
The contact surface with 0 can be made extremely small.

Therefore, since the suspension member 51 and the tube sheet 30 are in contact with each other, it is possible to significantly reduce the portions that are not electrodeposition coated, and to prevent corrosion from such uncoated portions. Will be able to.

Further, since the protrusion 55 is composed of a burring formed around the mounting hole, the contact surface between the protrusion 55 and the tube sheet 30 is for fixing the cooler 8 to the cooling unit 1. It is covered with the fixing screw 52 of 1, and it is possible to avoid contact with corrosive gas, and to avoid occurrence of corrosion.

As a result, it is possible to apply the electrodeposition paint containing the anticorrosive material to the details of the cooler 8, and the installation place where corrosive gas such as acetic acid gas or sulfite gas is generated. Even in this case, it is possible to avoid corrosion of the cooler 8 itself, and prevent deterioration of the cooler 8 itself and leakage of the refrigerant from the refrigerant pipe 35 in advance.

Further, the tube plates 30, 30 constituting the cooler 8
Since the dimension between the tube sheets can be determined by the hanging member 51 attached before painting, it is not necessary to change the dimension between the tube sheets 30 and 30 thereafter, and the tube sheets 30 and 3 can be fixed.
It becomes possible to avoid damage to the coating film due to the change in the dimension between zero. Further, since the dimension between the tube sheets 30 is fixed, the workability after that can be improved and the variation in dimension of the completed cooler 8 can be avoided in advance.

Further, since the holding members 56 are attached to the front and rear of the lower part of the cooler 8, the cooler 8 after coating can be easily stored.

[0054]

As described in detail above, according to the present invention, there is provided a coating apparatus for coating a heat exchanger by cationic electrodeposition coating, which comprises a coating tank for storing coating material and a current flowing therethrough, and a heat exchanger. Equipped with a hanging jig for hanging and immersing in the paint tank, and a hanging member that is detachably attached across the tube plates on both sides of the heat exchanger, and the hanging jig engages with the hanging member. Then, the heat exchanger is suspended and an electric current is applied to the heat exchanger through the suspension member, so that the heat exchanger can be easily coated.

Further, since the dimension between the tube sheets can be determined in advance by the suspending member, it is possible to prevent damage to the coating film due to the subsequent change in the dimension between the tube sheets. . Furthermore, since the dimensions between the tube sheets are determined, the workability after that can be improved, and it becomes possible to avoid variations in the finished dimensions of the heat exchanger.

According to the invention of claim 2, in addition to the above invention, the suspension member is formed with a plurality of engagement holes for engaging with the suspension jig over the longitudinal direction. , It becomes possible to engage a plurality of hanging jigs, whereby more current can be supplied and the coating efficiency can be improved.

According to the invention of claim 3, in addition to each of the above inventions, since the projection portion protruding toward the tube sheet side is formed around the mounting hole for mounting the hanging member to the tube sheet, the hanging member is formed. When the is attached to the tube sheet, the protrusion and the tube sheet can be attached in contact with each other, and the contact surface between the suspension member and the tube sheet can be significantly reduced.

Thus, even when the heat exchanger is fixed by the suspension member, the contact surface with the suspension member can significantly reduce the unpainted portion of the heat exchanger. It becomes possible to avoid corrosion from the parts that are not exposed.

According to the invention of claim 4, in addition to the invention of claim 3, since the projection is formed by burring around the mounting hole, the projection can be easily formed, The cost of the suspension member can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a cooling storage to which the present invention is applied.

FIG. 2 is a perspective view of a cooling unit to which the present invention is applied.

FIG. 3 is a vertical sectional side view of the cooling unit.

FIG. 4 is a transparent front view of a cooling unit.

FIG. 5 is a perspective view of a cooler as a heat exchanger.

FIG. 6 is a perspective plan view of the cooler with a hanging member attached.

FIG. 7 is a side view of the cooler with the suspension member also attached.

FIG. 8 is an explanatory diagram illustrating a configuration of a coating device for a heat exchanger.

[Explanation of symbols]

R cooling storage 1 cooling unit 8 Cooler (heat exchanger) 30 tube sheet 32 fins 33 Connection member 35 Refrigerant piping 50 heat exchanger coating equipment 51 Hanging member 51A engagement hole 52 fixing screw 53 Fixed member 54 Hanging jig 55 Projection 56 holding member

Continued front page    (72) Inventor Shoji Kubota             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd.

Claims (4)

[Claims] 1. A coating device for coating a heat exchanger by cationic electrodeposition coating, wherein a coating material tank for storing a coating material to which an electric current is applied and a suspension of the heat exchanger are immersed in the coating material tank. And a suspension member detachably attached to the tube plates on both sides of the heat exchanger, the suspension jig engaging with the suspension member and the heat exchanger. And a current is passed through the heat exchanger through the hanging member. 2. The heat exchanger according to claim 1, wherein the suspending member is formed with a plurality of engaging holes for engaging with the suspending jig in a longitudinal direction. Painting equipment. 3. The heat exchanger according to claim 1, wherein a protrusion protruding toward the tube sheet is formed around a mounting hole for attaching the suspension member to the tube sheet. Painting equipment. 4. The coating apparatus for a heat exchanger according to claim 3, wherein the protrusion is formed by burring around the mounting hole.