JPH0710239Y2 - Dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a drying device for drying an object to be dried by heating, and more particularly to a drying device requiring exhaust during drying.

(Prior Art) As an article requiring a drying step during manufacturing, there is, for example, a ceramic capacitor 21 (hereinafter simply referred to as a capacitor) as shown in FIG. This capacitor 21 has internal electrodes
22 and external electrodes 23 are respectively attached to both ends of a cylindrical ceramic element 24, and metal caps 25 with lead wires are fitted to the electrodes 22 and 23 in a conductive state. It is manufactured by forming an insulative paint layer 26 on the outer peripheral surface of the paint by painting and then drying the paint layer 26.

Conventionally, a drying device as shown in FIG. 5 has been used in the above drying process.

In the figure, 31 is a flat base, 32 is an exhaust pipe 32 at the center of the upper wall.
The cover 32 is a cover having a sectional shape in which a is projected and both ends are open, and a plurality (three in the figure) of the covers 32 are continuously arranged on the base 31 with a slight gap S for introducing outside air. There is. A heater 33 is embedded in the center of the base 31 facing the inner surface of the cover 32, and is composed of a rod-shaped electric heating body 33a and a heating holder 33b that holds the electric heating body 33a. Reference numeral 34 denotes a plurality (three in the figure) of intake pipes for exhaust, which are provided with an intake blower 35 at a collecting portion 34b communicating with outside air, and the intake port 34a of each intake pipe 34 is connected to the exhaust pipe 3
It is linked to 2a. In this dryer, the base 31 and cover
32 forms a furnace having an inlet 36 and an outlet 37 at each end and a heating passage K extending in one direction.

In the above-described drying device, the heating passage K can be heated to a predetermined drying temperature by energizing the electric heating element 33a, and the toxic gas generated from the paint during drying by the operation of the intake blower 35 is discharged through the exhaust pipe 32a. The air in the heating passage K can be sucked into the intake pipe 34 and discharged. Air is introduced from the inlet 36, the outlet 37, and the gaps S into the heating passage K that becomes a negative pressure by this suction.

The assembly C after coating of the capacitor 21 shown in FIG. 4 sequentially passes through the heating passage K with its lead wire portion suspended from the conveying member H, and the paint portion is heated and dried at the time of passage. .

(Problems to be solved by the invention) However, in the conventional drying device, an exhaust pipe 32a is formed in the center of the upper wall of each cover 32 that defines the heating passage K, and the air in the heating passage K is exhausted through the exhaust pipe 32a. Since the air is sucked into the intake pipe 34, as shown in FIG. 6, the hot air in the heating passage K is concentrated by suction to the center of the upper wall of each cover 32 where the exhaust pipe 32a exists, and the temperature of the portion is increased. There are other parts, especially the entrance
36, the outlet 37 and the gap S are locally higher than in the vicinity of the portion S, and there is a drawback that the temperature distribution in the heating passage K largely varies. This variation causes cracks in the paint and uneven drying. This causes an undesirable drying problem.

The present invention has been made in view of the above problems, and its object is to make the temperature distribution in the heating passage uniform,
An object of the present invention is to provide a drying device that can perform good drying.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides:
A heating furnace having a heating passage extending in one direction and an inlet / outlet at an end of the heating passage, and having a gap for introducing outside air at predetermined intervals, a heater arranged to face the heating passage, and formed in the heating furnace. In the drying device having a suction means for sucking the air in the heating passage through the exhaust port, the exhaust port is formed at least in the vicinity of each gap of the heating furnace.

According to a second aspect, in the drying device according to the first aspect, the air supply means is composed of an intake pipe and an intake blower, and the intake port of the intake pipe faces the exhaust port with a space therebetween. .

(Operation) In the drying device according to the first aspect, the inside of the heating passage can be heated to a predetermined drying temperature by the heater, and the air in the heating passage is sucked and discharged into the intake pipe through the exhaust port. be able to. Outside air is introduced into the heating passage, which becomes a negative pressure by this suction, through its inlet and outlet and each gap.

In this drying device, since the exhaust port is formed near at least each gap of the heating furnace, even when sucking the air in the heating passage through the exhaust port, the hot air concentrated in the exhaust tube portion in the heating passage, Air introduced from the adjacent gap can be mixed in to lower the temperature of the portion. That is, the above-mentioned air mixing reduces the temperature difference between the exhaust port portion and other portions in the heating passage, and makes the temperature in the heating passage substantially uniform.

Further, in the drying device according to claim (2), in addition to the above-mentioned action, since the intake port of the intake pipe constituting the intake means is opposed to the exhaust port with a space, the high temperature air in the heating passage is directly connected. The air in the heating passage can be sucked into the intake pipe together with the air in the vicinity of the air supply port without being sucked into the intake pipe, that is, due to the negative pressure generated in the intake port portion.

(Embodiment) FIGS. 1 and 3 show an embodiment of the present invention. FIG. 1 is a sectional view of a dryer, and FIG. 2 is a sectional view taken along line II-II of FIG. The figure is a temperature distribution diagram in the heating passage.

In FIG. 1 and FIG. 2, C is an assembly of the capacitor 21 shown in FIG. 4 after painting, and H is a direction in which the lead wire portion of the assembly C is suspended and the assembly C is in a direction orthogonal to the conveying direction. It is a conveying member that conveys continuously.

A flat base 1 constitutes a part of the capacitor manufacturing apparatus.

Reference numeral 2 is a cover having a cross-sectional shape with both ends open, and an exhaust pipe 2a is provided so as to project from one end of the upper wall. A plurality of covers 2 are continuously provided on the base 1 with a small gap S for introducing outside air.

A heater 3 is embedded in the center of the base 1 facing the inner surface of the cover 2, and is composed of a rod-shaped electric heating element 3a and a brass heating holder 3b that holds the electric heating element 3a.

Reference numeral 4 denotes a plurality of exhaust pipes for exhaust, which are provided with an intake blower 35 at a collecting portion 4b communicating with the outside air, and the intake ports 4a of the intake pipes 4 are arranged to face the exhaust pipes 2a at intervals.

In the drying device of this embodiment, the base 1 and the cover 2
A heating furnace having an inlet 6 and an outlet 7 at each end and a heating passage K extending in one direction is formed.

Next, the operation of the above-mentioned drying device will be described.

When the assembly C after coating is dried, the electric heating element 3a of the heater 3 is energized to raise the temperature inside the heating passage K to the drying temperature, while the intake blower 5 is operated.

The assembly C after coating, which is continuously transported by the transport member H, is
The coating material passes sequentially through the heating passage K heated to the drying temperature, and the coating material portion is heated and dried during the passage. Further, at the time of this drying, toxic gas is generated from the paint of the assembly C and is released into the heating passage K.

On the other hand, due to the operation of the blower 5 for intake air, a negative pressure is generated in the intake port 4a portion of each intake pipe 4, and the air in the heating passage K mixed with the toxic gas passes through the exhaust pipe 2a and the air in the vicinity of the air supply port 4a. It is sucked into the intake pipe 4 and discharged.

As described above, in the drying apparatus of this embodiment, since the exhaust pipe 2a is formed at one end of the upper wall of each cover 2, even if the air in the heating passage K is sucked through the exhaust pipe 2a, the exhaust pipe 2a portion It is possible to mix the air introduced from the adjacent gap S with the hot air in the heating passage K concentrated at the temperature to lower the temperature of the portion, and thereby the temperature of the exhaust pipe 2a and the temperature of the other portion. By eliminating the difference, the temperature in the heating passage K can be made substantially uniform. Therefore, in the above-mentioned drying, the coating portion of the assembly C can be dried extremely well without causing drying defects such as cracks and drying unevenness.

FIG. 3 shows the temperature distribution of the above heating passage K,
As can be seen from the figure, the temperature in the heating passage K is
Although the temperature of 2a part becomes slightly higher, it becomes almost uniform as a whole. The position of the exhaust pipe 2a is preferably close to the end of each cover 2 as much as possible in order to effectively mix the air introduced from the adjacent gaps S, but the gap S
When is large, similar temperature distribution can be expected even at a position slightly away from the end.

Further, since the intake port 4a of each intake pipe 4 is arranged to face the exhaust pipe 2a with a gap, the negative pressure generated in the intake port 4a causes the air in the heating passage K to pass through the exhaust pipe 2a to the supply port 4a. The air can be sucked into the intake pipe 4 together with nearby air, and the hot air in the heating passage K can be prevented from being directly sucked into the intake pipe 4 to suppress heat generation in the intake pipe 4. Moreover, the amount of air (exhaust amount) sucked from the heating passage K into the air supply pipe 4 can be easily adjusted by changing the distance between the intake port 4a of each intake pipe 4 and the exhaust pipe 2a. . Furthermore, since the intake pipe 4 is separated from the exhaust pipe 2a, the cover 2
The intake pipe 4 does not interfere with the removal of the
Repairs and the like can be easily performed.

Incidentally, in the above-mentioned embodiment, the one in which the capacitor assembly after painting is used as the article to be dried is exemplified, but other articles can be appropriately used as long as the article requires exhaust during drying. Also, when drying a long article or a large article, the article to be dried may be inserted into the heating passage and stopped to be dried. Further, although the intake port of the intake pipe is opposed to the exhaust port with a space left between them, the desired object can be achieved by directly connecting the both as in the conventional case.

(Effects of the Invention) As described in detail above, according to the drying apparatus of claim (1), since the exhaust port is formed at least in the vicinity of each gap of the heating furnace, the inside of the heating passage is provided through the exhaust port. Even when the air is sucked, the air introduced from the adjacent gap can be mixed with the hot air in the heating passage concentrated in the exhaust port portion to lower the temperature of that portion. There is an advantage that the temperature difference from the portion of (1) is reduced and the temperature in the heating passage is made substantially uniform, and desired drying can be performed extremely well.

Further, according to the drying device of the second aspect, in addition to the above effect, since the intake port of the intake pipe is opposed to the exhaust port with a gap, the negative pressure generated at the intake port causes the inside of the heating passage Of the air can be sucked into the intake pipe together with the air near the air supply port through the exhaust port, and it is possible to prevent the hot air in the heating passage from being directly sucked into the intake pipe and prevent the heat generation of the intake pipe. is there. Moreover, the amount of air (exhaust amount) sucked from the heating passage into the air supply pipe can be easily adjusted by changing the distance between the intake port and the exhaust port of the intake pipe. Furthermore, since the intake pipe is far from the exhaust port,
The intake pipe does not interfere with the removal of the cover, and the inspection and repair of the heating device can be easily performed.

[Brief description of drawings]

1 and 3 show an embodiment of the present invention. FIG. 1 is a sectional view of a drying device, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a heating passage. Fig. 4 is a side view of a partially broken ceramic capacitor, Fig. 5 and Fig. 6 are conventional examples, Fig. 5 is a side view of a dryer, and Fig. 6 is a heating passage. It is a temperature distribution diagram of. In the figure, 1 ... base, 2 ... cover, 2a ... exhaust stack, 3 ...
... Heater, 4 ... Intake pipe, 4a ... Intake port, 5 ... Intake blower, 6 ... Inlet, 7 ... Outlet, K ... Heating passage, S
……gap.

Claims (2)

[Scope of utility model registration request] 1. A heating furnace having a heating passage extending in one direction, an inlet / outlet port at an end of the heating passage, and a gap for introducing outside air at predetermined intervals, and a heater arranged to face the heating passage. A drying device comprising a suction means for sucking air in the heating passage through an exhaust port formed in the heating furnace, wherein the exhaust port is formed at least near each gap of the heating furnace. 2. The drying device according to claim 1, wherein the intake means is composed of an intake pipe and an intake blower, and the intake port of the intake pipe is opposed to the exhaust port with a space therebetween.