JP3906058B2 - Heat exchanger coating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating apparatus for coating a heat exchanger by cationic electrodeposition coating.
[0002]
[Prior art]
In recent years, cooling by a cooling unit is required in a bread factory or a factory that handles egg products. Such a cooling unit is provided with a cooler as a heat exchanger and a blower for cooler in an outer case, and constitutes a so-called refrigeration cycle with a separate compressor and condenser. In addition, a discharge port is formed in the front surface of the outer case of the cooling unit, and a damper is pivotally supported forward on the upper edge of the discharge port so as to close the discharge port. Suspended. When the cooler blower is operated, the cool air sucked into the exterior case from the lower surface of the exterior case is discharged from the discharge port via the cooler.
[0003]
For example, such a cooling unit is arranged on the ceiling top wall of a prefabricated cooling storage and the like, and the inside of the warehouse is cooled to a predetermined temperature by forcibly convection of cool air from the ceiling into the warehouse by a cooling fan.
[0004]
[Problems to be solved by the invention]
However, when the cooling unit as described above is installed in a bread factory or a factory that handles egg products, corrosive gases such as acetic acid gas or sulfite gas are generated by yeast or cooked eggs handled in the factory. Therefore, in a normal cooling unit, a cooler composed of a metal such as iron is immediately corroded. Therefore, there is a problem that the cooler itself deteriorates or the refrigerant leaks from the refrigerant pipe.
[0005]
Therefore, in order to improve the corrosion resistance of the cooler itself, painting was performed by spraying a paint containing a corrosion-resistant material on the completed cooler. There was an inconvenience that uneven coating occurred in screw holes for fixing.
[0006]
Further, there has been a problem that the coating film coated on the tube plate is damaged and peeled off by changing the width dimension of the cooler after coating and moving the tube plate constituting the cooler.
[0007]
Therefore, due to uneven coating or damage to the coating film, the details where the coating film is not formed or the part where it has been peeled off are exposed to corrosive gases such as the above-mentioned acetic acid gas or sulfite gas. There is a problem that causes deterioration.
[0008]
Accordingly, the present invention has been made to solve the conventional technical problems, and an object of the present invention is to provide a heat exchanger coating apparatus capable of avoiding corrosion of the heat exchanger in advance.
[0009]
[Means for Solving the Problems]
The coating device for a heat exchanger according to the present invention is a coating device that coats a heat exchanger by cationic electrodeposition coating, and stores a paint, a paint tank in which an electric current is passed, and a paint tank by hanging the heat exchanger. In order to attach the suspension member to the tube plate, a suspension jig for immersing in the interior and a suspension member detachably attached to each tube plate across the tube plates on both sides of the heat exchanger A protrusion projecting toward the tube plate is formed around the mounting hole of the tube, and the hanging jig is engaged with the hanging member to suspend the heat exchanger, and the heat is passed through the hanging member. A current is passed through the exchanger.
[0010]
According to the present invention, a coating apparatus for coating a heat exchanger by cationic electrodeposition coating, in which paint is stored, a paint tank in which an electric current is passed, and a heat exchanger is suspended and immersed in the paint tank. And a suspension member that is detachably attached to each tube plate across the tube plates on both sides of the heat exchanger. The suspension jig engages with the suspension member to exchange heat. Since the current is passed through the heat exchanger through the suspension member, the heat exchanger can be easily painted.
[0011]
In addition, since the dimension between the tube sheets can be determined in advance by the suspension member, it is possible to avoid damage to the coating film due to the subsequent change in the dimension between the tube sheets. Furthermore, since the dimension between the tube sheets is determined, the subsequent workability can be improved, and the variation in the completed heat exchanger dimension can be avoided in advance.
[0012]
In particular, since a protrusion protruding toward the tube plate was formed around the mounting hole for attaching the suspension member to the tube plate, the protrusion and the tube plate were contacted when the suspension member was attached to the tube plate. The contact surface between the suspension member and the tube sheet can be remarkably reduced.
[0013]
Thereby, even when the heat exchanger is fixed by the suspension member, the non-painted portion of the heat exchanger can be remarkably reduced by the contact surface with the suspension member. Corrosion can be avoided in advance.
[0014]
In addition to the above , the coating device for a heat exchanger according to a second aspect of the invention is characterized in that the protrusion is configured by burring the periphery of the mounting hole.
[0015]
According to the invention of claim 2, in addition to the above , since the protrusion is configured by burring the periphery of the mounting hole, the protrusion can be easily formed, and the cost of the suspension member is reduced. Will be able to.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
First, the Example which applied the heat exchanger of this invention based on drawing is explained in full detail. 1 is a vertical side view of a cooling storage R to which a cooler 8 as a heat exchanger constructed 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. Is a longitudinal 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.
[0017]
The cooling unit 1 in which the cooler 8 serving as the heat exchanger of the present invention is disposed is a bread factory or egg product in which corrosive gas such as acetic acid gas or sulfite gas is generated by yeast or cooked eggs. It is used for a cooling storage R such as a prefabricated freezer / refrigerator installed in a factory to handle. The cooling storage R is constituted by a heat insulating box 3, and a storage chamber 2 is constituted in the heat insulating box 3. This heat insulation box 3 is formed in a box shape by combining a heat insulation panel 4 having a convex portion or a concave portion at a joint portion with an adjacent panel.
[0018]
The front wall of the heat insulation box 3 is formed with an article entrance for taking in and out articles such as stored foods. The article entrance is pivotally supported on one side of the article entrance so as to be opened and closed. A heat insulating door 5 that closes and seals the storage chamber 2 is provided.
[0019]
The cooling unit 1 is installed, for example, on the ceiling surface 3A on the storage chamber 2 side of the heat insulating box 3, and is disposed in a separate outdoor unit (not shown) in an exterior case 7 having a damper 6 formed on the front surface. A cooling device constituted by a compressor, a condenser and the like, a cooler 8 as a heat exchanger constituting a well-known refrigeration cycle, and a cooling fan 9 for discharging cold air to the cooler 8 on the damper 6 side have. In addition, the detailed structure of the cooler 8 and the coating device 50 of the heat exchanger of the present invention will be described later.
[0020]
The cooler 8 is disposed on the damper 6 side, and the cooler fan 9 is disposed on the side of the cooler 8 and at the rear of the cooling unit 1. In the figure, reference numeral 14 denotes a fan case provided below the cooler blower 9.
[0021]
Below the cooler 8, a drain pan 16 having an opening on the upper surface is formed by bending the outer peripheral edge of the plate-like member at a substantially right angle to the upper part, that is, the cooler blower 9 on the opposite side of the damper 6. It is provided with a low slope on the side. A drain hole (not shown) is formed in 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.
[0022]
The drain pipe 17 is connected to a drain hose 18 for draining drain water received on the drain pan 16 to the outside. 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.
[0023]
On the other hand, as shown in FIGS. 2 and 3, the exterior case 7 is made of a plate-like member such as aluminum, and closes the main body 10 having openings on both side surfaces, the lower surface, and the front surface, and the lower surface opening of the main body 10 so as to be freely opened and closed. The frame cover 11 is composed of side plates 12 and 12 that respectively close both side surfaces of the main body 10.
[0024]
The opening formed in the front surface of the outer case 7 serves as a discharge port 6A for discharging cool air discharged from the cooler blower 9. 3 and 4, a wind direction plate 15 is provided between the cooler 8 and the damper 6 and is provided at the lower part of the discharge port 6 </ b> A, that is, in front of the lower part of the cooler 8. The opening formed in the rear portion of the frame cover 11 serves as a cold air inlet 13 for sucking the cold air in the storage chamber 2 into the cooling unit 1 by the cooler blower 9.
[0025]
Moreover, the upper end of the side plate 12 is formed with a flange 22 whose outer periphery is bent inward. In FIG. 2, 12B is a holding part for holding a screw member (not shown) that fixes the cooling unit 1 to the top surface of the storage chamber 2. The side plates 12 are formed symmetrically, and the side plates 12 on both sides are configured as a common member.
[0026]
Next, the structure of the cooler 8 as a 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 plates 30, 30, a plurality of heat exchange fins 32, and a refrigerant pipe 35. In this embodiment, it is assumed that the cooler 8 is configured by connecting two heat exchangers configured by the tube plates 30 and 30 and the like in parallel by the connecting member 33.
[0027]
The refrigerant pipe 35 is constituted by a raw pipe made of a metal material such as iron, and a tubular member 35A in which the raw pipe is formed in a U shape in the longitudinal direction and the end of the tubular member 35A are closed. And a U-shaped member 35B. Then, by alternately engaging the plurality of tubular members 35A and the U-shaped member 35B, the refrigerant pipe 35 is formed in a meandering shape.
[0028]
The heat exchange fins 32 are formed of thin plate-shaped aluminum plates, and a plurality of through holes (not shown) are formed in the fins 32.
[0029]
On the other hand, the tube sheet 30 is made of a plate member made of metal such as iron, and has one side end, that is, one side end positioned inward, from the inside toward the center of the tube plate 30. Two heater holding portions 34 cut horizontally are formed on the upper and lower sides. The heater holding part 34 is for holding a defrosting heater (not shown) for heating the cooler 8 when the cooler 8 is defrosted.
[0030]
And the outer peripheral edge in which the heater holding | maintenance part 34 of this tube sheet 30 is not formed forms the flange part 30A bent at the substantially right angle toward outward. Note that the flange portion 30A constituting the side surface of the tube plate 30 is fixed to the outer case 7 of the cooler 8 and to a fixing screw 52 for fixing a suspension member 51 to be described later. A plurality of members 53 are attached. In addition, a plurality of through holes (not shown) are formed in the tube plate 30, and the refrigerant pipe 35 is held by penetrating the refrigerant pipe 35 through the through holes. Note that reference numeral 40 shown in FIG. 5 denotes an intermediate tube plate. By providing the intermediate tube plate, the strength of the cooler 8 is improved.
[0031]
Here, the assembly procedure of the cooler 8 will be described. First, after facing the tube plates 30, 30, a plurality of heat exchange fins 32 are arranged between the tube plates 30, 30, and the tubular member 35 A of the refrigerant pipe 35 is connected to the through hole of one tube plate 30. The through holes formed in the plurality of heat exchange fins 32 are inserted into the through holes formed in the other tube plate 30. Then, after expanding the tubular member 35A of the refrigerant pipe 35 by means of a refrigerant pipe expanding means (not shown), the U-shaped member 35B is attached to the end of each tubular member 35A so that the refrigerant pipe 35 has a meandering shape. It is welded by heat. Thereby, the cooler 8 before painting is completed.
[0032]
Next, with reference to FIG. 6 thru | or FIG. 8, the coating device 50 of the heat exchanger of this invention is demonstrated. 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 is a view of the heat exchanger of the present invention. It is explanatory drawing explaining the structure of the coating apparatus 50. FIG.
[0033]
As shown in FIGS. 6 and 7, the suspension member 51 is fixed to the cooler 8 when coating is performed. The suspension member 51 is a plate-like member that is detachably attached to the front and rear upper portions across the tube plates 30 and 30 constituting the cooler 8, and has an upper end substantially outward as shown in FIG. It has a substantially L-shaped cross section bent at a right angle.
[0034]
The suspension member 51 is provided with a mounting hole (not shown) for detachably engaging with the fixing member 53 of the tube plate 30 in the longitudinal direction on the surface in contact with the tube plate 30. . A projection 55 protruding toward the tube plate 30 is formed around the mounting hole as shown in FIG. In this embodiment, the protrusion 55 is formed by burring the periphery of the mounting hole. Therefore, the protrusion 55 can be easily formed, and the cost of the hanging member 51 can be reduced.
[0035]
In addition, a plurality of engagement holes 51A in the present embodiment are formed on the other surface of the suspension member 51 to engage with a suspension jig 54, which will be described in detail later, in the longitudinal direction. ing.
[0036]
Further, holding members 56 are attached to the lower portions of the front and rear sides of the tube plates 30 and 30 constituting the cooler 8. The holding member 56 is a plate-like member formed extending 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.
[0037]
The holding member 56 is shown on the surface in contact with the tube plate 30 so as to be detachably engaged with the fixing member 53 of the tube plate 30 in the longitudinal direction, like the suspension member 51. A mounting hole is formed. A projection 57 that protrudes toward the tube plate 30 is formed around the mounting hole, like the suspension member 51. In this embodiment, similarly to the protrusion 55 of the suspension member 51, the protrusion 57 may also be configured by burring around the mounting hole.
[0038]
Next, the electrodeposition coating apparatus 50 will be described with reference to FIG. This electrodeposition coating apparatus 50 is an apparatus for coating a heat exchanger such as the cooler 8 by so-called cationic electrodeposition coating, and a paint tank 61 for storing an electrodeposition paint 60 containing a corrosion-proof material, and the paint tank. A transport device 62 that transports the cooler 8 while being immersed in the paint tank 61 above 61, a power supply member 63 provided in the transport device 62, and supports the cooler 8 while being in contact with the power supply member 63. It comprises a plurality of suspension jigs 54 that are transported into the electrodeposition paint 60 in the paint tank 61.
[0039]
In addition, the conveyance apparatus 62 shall be comprised by the two conveyance rails provided in parallel, and the electric power feeding member 63 and the suspension jig | tool 54 shall be provided in both conveyance rails.
[0040]
Moreover, 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 supply member 63, and the anode of the voltage supply source is connected to the paint tank 61. It is connected to an electrode (not shown) immersed in the electrodeposition paint 60.
[0041]
On the other hand, the suspension jig 54 includes a main body 54A that is suspended so as to be transportable by the transport device 62, and an engagement member 54B that is suspended by a plurality of the main body 54A. By contacting, the current flows to the engaging member 54B.
[0042]
With the above-described configuration, the engagement member 54B of the suspension jig 54 is engaged with the engagement holes 51A of the suspension member 51 fixed to the front and rear upper parts of the cooler 8, respectively. The cooler 8 is suspended on the surface. Then, the cooler 8 is immersed in the paint tank 61 in which the electrodeposition paint 60 is stored while the suspension device 54 is in contact with the power supply member 63 by the transport device 62. Therefore, a current flows through the cooler 8 via the suspension member 51 and the suspension jig 54.
[0043]
At this time, since a direct current flows between the electrode in the electrodeposition paint 61 in the paint tank 61 as described above, an electrodeposition paint film can be easily formed on the surface of the cooler 8. Can do. Further, since the cooler 8 performs painting by engaging the suspension members 51, 51 attached to the front and rear with the suspension jig 54, the cooler 8 can be painted while being held horizontally. In addition, it becomes possible to flow current from both the front and rear sides of the cooler 8, and the coating unevenness can be remarkably suppressed.
[0044]
Further, since the plurality of engagement members 54B of the suspension jig 54 are engaged with the plurality of engagement holes 51A of the suspension member 51 attached to the cooler 8, the current from the power supply member 63 is It will flow to the cooler 8 through the plurality of engaging members 54B of the hanging jig 51. Therefore, more current can be supplied to the cooler 8, and the coating efficiency can be improved.
[0045]
As described above, since the protrusion 55 projecting toward the tube plate 30 is formed around the mounting hole for attaching the suspension member 51 to the tube plate 30, the contact surface between the suspension member 51 and the tube plate 30. Can be significantly reduced.
[0046]
Therefore, since the suspension member 51 and the tube plate 30 are in contact with each other, it becomes possible to remarkably reduce the portion not subjected to electrodeposition coating, and it is possible to avoid corrosion from the portion not coated. It becomes like this.
[0047]
Further, since the protrusion 55 is constituted by a burring formed around the mounting hole, the contact surface between the protrusion 55 and the tube plate 30 is a fixing screw for fixing the cooler 8 to the cooling unit 1. The contact with the corrosive gas can be avoided, and the occurrence of corrosion can be avoided.
[0048]
As a result, it is possible to apply the electrodeposition paint containing the anticorrosive material to the details of the cooler 8, and it is an installation place where corrosive gas such as acetic acid gas or sulfite gas is generated. However, corrosion of the cooler 8 itself can be avoided, and deterioration of the cooler 8 itself and leakage of the refrigerant from the refrigerant pipe 35 can be avoided in advance.
[0049]
Moreover, since the dimension between the tube plates 30 and 30 which comprise the cooler 8 can be decided with the suspension member 51 attached before coating, it is necessary to change the dimension between the tube plates 30 and 30 after that. Therefore, it is possible to avoid damage to the paint film due to a change in the dimension between the tube sheets 30 and 30 in advance. Furthermore, since the dimension between the tube sheets 30 and 30 is determined, the workability after that can be improved, and the variation of the dimension of completion of the cooler 8 can be avoided beforehand.
[0050]
In addition, since the holding members 56 are attached to the lower part of the cooler 8 in the front and rear, the cooler 8 after painting can be easily stored.
[0051]
【The invention's effect】
As described above in detail, according to the present invention, there is provided a coating apparatus for coating a heat exchanger by cationic electrodeposition coating, in which paint is stored and a paint tank in which an electric current is passed, and the heat exchanger is suspended to a paint tank. A suspension jig that is immersed in the interior and a suspension member that is detachably attached to each tube plate across the tube plates on both sides of the heat exchanger. The suspension jig is associated with the suspension member. In addition, the heat exchanger is suspended, and an electric current is passed through the heat exchanger via the suspension member, so that the heat exchanger can be easily painted.
[0052]
In addition, since the dimension between the tube sheets can be determined in advance by the suspension member, it is possible to avoid damage to the coating film due to the subsequent change in the dimension between the tube sheets. Furthermore, since the dimension between the tube sheets is determined, the subsequent workability can be improved, and the variation in the completed heat exchanger dimension can be avoided in advance.
[0053]
In particular, since a protrusion protruding toward the tube plate was formed around the mounting hole for attaching the suspension member to the tube plate, the protrusion and the tube plate were contacted when the suspension member was attached to the tube plate. The contact surface between the suspension member and the tube sheet can be remarkably reduced.
[0054]
Thereby, even when the heat exchanger is fixed by the suspension member, the non-painted portion of the heat exchanger can be remarkably reduced by the contact surface with the suspension member. Corrosion can be avoided in advance.
[0055]
According to the invention of claim 2, in addition to the above , since the protrusion is configured by burring the periphery of the mounting hole, the protrusion can be easily formed, and the cost of the suspension member is reduced. Will be able to.
[Brief description of the drawings]
FIG. 1 is a longitudinal 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 side view of a cooling unit.
FIG. 4 is a perspective front view of the 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 the suspension member attached.
FIG. 7 is a side view of the cooler with the suspension member attached thereto.
FIG. 8 is an explanatory diagram illustrating the configuration of a coating device for a heat exchanger.
[Explanation of symbols]
R Cooling storage 1 Cooling unit 8 Cooler (heat exchanger)
DESCRIPTION OF SYMBOLS 30 Tube plate 32 Fin 33 Connecting member 35 Refrigerant piping 50 Heat exchanger coating apparatus 51 Hanging member 51A Engagement hole 52 Fixing screw 53 Fixing member 54 Hanging jig 55 Protrusion part 56 Holding member

Claims (2)

A coating device for coating a heat exchanger by cationic electrodeposition coating,
A paint tank for storing paint and flowing current;
A suspension jig for suspending the heat exchanger and immersing it in the paint tank,
A suspension member detachably attached to each of the tube plates across the tube plates on both sides of the heat exchanger ,
Around the mounting hole for attaching the suspension member to the tube plate, a projection protruding to the tube plate side is formed,
A coating apparatus for a heat exchanger, wherein the suspension jig engages with the suspension member to suspend the heat exchanger, and an electric current flows through the suspension member via the suspension member. The coating device for a heat exchanger according to claim 1 , wherein the protrusion is configured by burring the periphery of the mounting hole .

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