JPS5818636Y2 - Paint drying material cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for dried paint, and more particularly to a cooling device with improved thermal efficiency.

As shown in Figure 1, a conventional paint drying and cooling furnace has an air supply fan that sucks in outside air and blows it onto the object to be cooled, and an exhaust fan that exhausts the outside air, which has been blown to the object and whose temperature has risen, to the outside. A type in which each oven in the series up to the drying oven is provided is generally used.

That is, the conventional paint drying cooling furnace includes an air supply fan 1, an exhaust fan 3, an air supply duct 5, air supply chambers 7A and 7B,
Its main part is composed of the air supply nozzle 9 and the like.

Next, an example of a conventional cooling device using an automobile body as the object to be cooled 11 will be described.

The automobile body, which is the object to be cooled 11, which has had its paint film baked in the paint drying oven, enters the cooling oven while still at a high temperature.

In the cooling furnace, outside air is sucked in by the air supply fan 1, and the sucked outside air is sent from the air supply duct 5 to the left and right air supply chambers 7A and 7B, which are divided into two branches, and is then sent to the left and right air supply chambers 7A and 7B through the air supply nozzle 9. It exchanges heat with the coolant 11 and is discharged to the outside air by the exhaust fan 3.

However, conventional cooling devices have the following drawbacks.

(b) Since outside air, which changes depending on the seasons and weather conditions, is used as a source of cold air, the average temperature difference (J Tm) and humidity between the cold outside air and the object to be cooled are different, and the object to be cooled at the outlet of the cooling furnace is different. The temperature of the object 11 is not constant from beginning to end, and in the summer, the outside air temperature rises, so the cooling capacity becomes insufficient, and the object 11 to be cooled cannot be cooled to a predetermined temperature.

(b) Since the cooling furnace design is based on summer conditions, which have poor conditions, large-capacity supply and exhaust fans must be installed, which increases running costs.

(c) Since the cold air source is outside air, the conventional method cannot be used if the outside air contains salt or other substances that may have an adverse effect on the paint film.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of conventional painted object cooling devices, and to avoid being affected by changes in the temperature and humidity of the outside air due to seasons and weather conditions, as well as by components contained in the outside air. It is an object of the present invention to provide a coating drying material cooling device capable of efficiently cooling an object to be cooled while saving energy.

The paint drying material cooling device according to the present invention includes a hot water production device that uses the heat source of a paint drying furnace or its ancillary equipment, an absorption refrigeration device that uses hot water obtained from this hot water production device as a heat source, and this absorption refrigeration device. a heat exchanger that cools the cold air to be supplied to the painting cooling furnace with the cold water obtained in the painting cooling furnace through gas-liquid heat exchange; and a device for circulating the air.

Embodiments of the present invention will be described based on the accompanying drawings.

The coating drying product cooling device shown in FIG. 2 is a coating drying oven 13.
, a jacket 21 installed on the inner wall of the paint drying oven 13.
Paint cooling furnace 15, hot water heat storage tank 17, absorption refrigerator 19,
It is composed of a gas-liquid heat exchanger 34, a cold air duct 32, a cold air circulation fan 36, and the like.

Fig. 3 is a configuration diagram of the jacket 21 provided on the inner wall of the paint drying oven, which is made up of a drying oven wall plate 40, a drying oven wall outer plate 42, and a heat insulating material 44, and the jacket 21 is provided on the side of the inner plate of the oven. .

In the paint drying oven 13, hot air generated by a hot air generator 22 is supplied via a fan 24 and circulated through a duct 26 again, and a portion of the air is discharged to the outside of the system through an exhaust duct 28.

The temperature of the hot water passing through the jacket 21 installed on the inner wall of the paint drying oven 13 rises to approximately 88°C, and the hot water pipe 4
6A, the hot water is temporarily stored in the hot water heat storage tank 17, and sent to the absorption chiller 19 via the hot water pipe 46B by the hot water circulation pump 48A.

Inside the refrigerator 19, the process of regenerating, condensing, evaporating, and absorbing the heat medium is repeated using the hot water as a heat source to obtain cold water at 9°C.

This cold water is conveyed by the cooling furnace cold water circulation pump 52 through the cold water pipe 50A to the gas-liquid heat exchanger 34 incorporated in the circuit consisting of the paint drying cooling furnace circulation duct 32, and the circulating cold air is heated to approximately 16 to 17°C. The cold air is blown onto the object to be cooled from a furnace air supply nozzle (not shown) provided for coating cooling, and the temperature has increased through heat exchange with the object to be cooled. The spirit of
The liquid heat exchanger 34 lowers the temperature to 16-17° C. and repeats the cycle.

On the other hand, heat is exchanged with the circulating cold air in the air-liquid heat exchanger 34 for approximately 14 hours.
The cold water whose temperature has risen to about 0.degree. C. is returned to the absorption chiller 19 through the cold water pipe 50B, and is taken out again as cold water at 9.degree. C., and the above cycle is repeated.

Further, the temperature of the hot water sent to the refrigerator 19 via the hot water pipe 46B by the circulation pump 48A is lowered to about 83°C, and then the hot water is sent to the hot water circulation pump 48 via the hot water pipe 46C.
At B, it is transported into a jacket 21 installed on the inner wall of the paint drying oven and heated again to 88°C, and the cycle is repeated thereafter.

The cooling tower 38 for cooling the absorption chiller is used to condense the heat medium, and the cooling tower 38 turns the cooling water into droplets and falls through the air, and the cooling water whose temperature has decreased is passed through the cooling water pipe 58A by the cold water circulation pump 56. The cooling water that reaches the refrigerator 19 and whose temperature has increased is returned to the cooling tower 38 via the pipe 58B, and the above cycle is repeated.

In this example, a hot water recovery jacket was installed on the inner wall of the paint drying oven, which lowered the temperature of the outer surface of the oven wall, and although the fuel required for the paint drying oven increased somewhat, the amount of heat dissipated from the oven wall was significantly reduced. do.

Furthermore, when the paint drying furnace is a raised-bed type mountain type furnace, the structure of the furnace entrance and exit does not allow hot air to leak, so heat exchange is improved in the series of equipment from the undercoating to the topcoating process compared to conventional equipment.

In the present invention, in order to recover hot water as a heat source for the absorption refrigerator, not only the paint drying furnace but also the exhaust gas or waste gas from the flue or deodorizing device that is ancillary equipment thereof can be used.

It is also possible to introduce a conventional outside air cooling method in the early zone of the cooling furnace where the temperature of the object to be cooled is high, and to use a cold air cooling method using a refrigerator in the latter half zone.

In this case, the object to be cooled can be efficiently cooled in the latter half zone of the cooling furnace without being affected by outside air.

Since the present invention has the above-described structure and operation, it has the following effects.

(b) By using an absorption chiller as the cold air generation source, it is possible to constantly supply a stable cooling air, and the cooling capacity is not insufficient due to outside air conditions as with conventional methods, allowing cooling throughout the year. It became possible to cool things to a certain temperature.

(b) Since the temperature of the cooling air is lowered compared to the conventional method, the average temperature difference (JTm) with the object to be cooled becomes larger, making it possible to significantly reduce the cooling air volume, reducing the rerunning cost by 56%. Reduced.

(c) Since the cooling air is recirculated, it is now possible to construct a factory even in locations where the outside air contains salt or other harmful substances that may be harmful to the paint film.

[Brief explanation of drawings]

Figure 1 is a structural diagram of a conventional cooling furnace, Figure 2 is a system diagram showing an embodiment of the present invention, and Figure 3 is a jacket installed on the inner wall of a drying furnace for hot water recovery used in an absorption chiller. FIG. 11...Object to be cooled, 13...Paint drying oven, 15...Paint drying cooling oven, 19...
・Absorption refrigerator, 21... Jacket, 34.
...Gas-liquid heat exchanger.

Claims (1)

[Scope of utility model registration request] A hot water production device that uses the heat source of the paint drying furnace or its ancillary equipment, an absorption refrigeration device that uses the hot water obtained from this hot water production device as its heat source, and a supply of cold water obtained from this absorption refrigeration device to the paint cooling furnace. a heat exchanger that cools the cold air to be treated by gas-liquid heat exchange, and a device that circulates the cold air whose temperature has increased after passing through the paint cooling furnace to the paint drying furnace via the heat exchanger again. Dry matter cooling equipment.