JPH10197155A - Retort furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform simultaneous and effective cooling of a vacuum seal and cooling of a furnace body by a method wherein cooling air after the passage of it through the periphery of a seal is introduced in a gap between a heat insulation material and the furnace body to generate an air flow. SOLUTION: When, with various treatment containing degreasing carried out, a blower is operated and gas in a furnace body 1 is exhausted, air is sucked in a gap S3 through an opening 15 formed in an openable cover 6 of the furnace body 1 by a negative pressure. After the air makes effective contact with an openable cover 11 of a retort 2, the air flows through a gap S4 and flows out through a pipe 16. At the same time when a vacuum seal 10 is air-cooled to temperature at which the function thereof is held, heat being about to be propagated from the retort 2 through a heat insulation material 4 to the furnace body 1 is also simultaneously carried out to the outside of the furnace body 1 by an air flow. This constitution effectively prevents the occurrence of a situation that the temperature of the surface of the furnace body 1 is increased and improves working environment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retort furnace suitably used for various heat treatments including a degreasing treatment.

[0002]

2. Description of the Related Art As shown in FIG. 2, this type of retort furnace has a retort furnace 2 capable of evacuating an internal heat treatment chamber S1.
And a heating space S arranged around the retort 2
2 and a heat insulating material 4 disposed at a position surrounding the heating space S2 including the heater 3 are housed inside the furnace body 1, and the retort 2, the heat insulating material 4 and the furnace body 1 are housed in the furnace body 1. Retort main body 9, heat insulating material main body 13, furnace body main body 5, respectively
And the opening / closing lids 111, 14, and 106 so that the processing object W can be put into and taken out of the heat treatment chamber S 1, and the sealing property of the heat treatment chamber S 1 between the opening / closing lid 111 of the retort 2 and the retort main body 9. Vacuum seal 10 to secure
And is interposed.

[0003]

By the way, the heat insulating material 4 is filled between the retort main body 9 and the furnace body 5 so that the heat from the retort 2 is not transmitted to the furnace body 1 as much as possible. However, in this case, a large amount of the fragile and expensive heat insulating material 4 is required, and the furnace body 1 passes through the heat insulating material 4.
As a result, the temperature rise on the surface of the furnace 1 and the deterioration of the working environment due to the heat are unavoidable, and the cooling rate after the heat treatment is low, so that it is difficult to improve the processing efficiency.

[0004] Further, the conventional one is an open / close lid 10 of a furnace body 1.
6, a cooling jacket 17 is provided, and the vacuum seal 10 is cooled by water cooling. However, since the cooling jacket 17 locally cools the opening / closing lid 111 of the retort 2, the vapor of the binder generated in the retort 2 is condensed in this portion, which adversely affects the processing effect. The present invention has been made in view of such problems,
It is an object of the present invention to provide a retort furnace having a cooling structure capable of simultaneously and effectively cooling a vacuum seal and a furnace body.

[0005]

According to the present invention, in order to achieve the above object, a gap is provided between the heat insulating material and the furnace body, and cooling air after passing around the seal is introduced into the gap. It is characterized by forming an air flow. With this configuration, when the vacuum seal is air-cooled to a temperature that can maintain its function, heat that is to be transmitted from the retort to the furnace body via the heat insulating material can be simultaneously carried out of the furnace by the air flow. Therefore, a situation in which the surface of the furnace body is heated can be effectively prevented, and the working environment can be improved. In addition, if the amount of heat stored in the furnace body is reduced and a gap that can form an air flow is formed, the cooling rate after the heat treatment is increased, so that the operating efficiency of the furnace can be effectively improved.

[0006] Further, since the amount of the relatively brittle and expensive heat insulating material can be reduced, the cost of the furnace can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. Note that parts common to those in FIG. 2 are denoted by the same reference numerals. This retort furnace includes a retort 2 in a furnace body 1.
, A heater 3 and a heat insulating material 4.

The furnace body 1 is made of metal and includes a bottomed furnace body 5 having a tubular shape and an opening / closing lid 6 provided at an opening end 5a of the furnace body 5, and an exhaust device is provided at the bottom 5b. The exhaust pipe 7 connected to the air blower 8 and the blower pipe 8 connected to the cold air blower are drawn in. The retort 2 is made of a metal having a bottomed cylindrical retort main body 9 and an opening / closing lid 11 disposed at a position where the opening end 9a of the retort main body 9 is sealed via a vacuum seal 10 such as an O-ring. The bottom end 9b is connected to the starting end 7a of the exhaust pipe 7, and the inside is a heat treatment chamber S1 capable of evacuating. The opening / closing lid 11 of the retort 2 is attached to the opening / closing lid 6 of the furnace body 1 so as to be integrally opened and closed.

The heater 3 is uniformly disposed around the retort main body 9 and has a heating space S2 formed inside. The heater 3 has a Ni heater having a heating capacity of, for example, about 500 to 600 ° C. Is used. Insulation material 4
Is disposed at a position surrounding the heating space S2 including the heater 3, and includes a heat insulating material main body 13 and an opening / closing lid 14. The heat insulating material main body 13 includes the retort main body 9 and the furnace main body 5.
, A substantially bottomed cylindrical portion 13a provided so as to avoid the exhaust pipe 7 and the blower tube 8, and a roughly lid portion 13 provided at a position corresponding to the opening / closing lid 14 when apparently closed.
b, and serves to block heat transfer from the retort body 9 to the furnace body 5. Lid 14
Is disposed inside the retort 2 and serves to block heat transfer between the heating space S2 and the opening / closing lid 11 of the retort 2.

By opening and closing the open / close lids 6, 11, and 14 of the furnace body 1, retort 2 and heat insulating material 4, the processing object W can be taken in and out of the heat treatment chamber S1. In such a configuration, in the present embodiment, a gap S3 is provided between the opening / closing lid 6 of the furnace body 1 and the opening / closing lid 11 of the retort 2, and a gap S4 is provided between the heat insulating material body 13 and the furnace body body 5. Is provided. The gap S3 is provided between the two open / close lids 6, 11
The cooling air is introduced into the inside of the furnace body 1 through an opening 15 provided in the opening / closing lid 6 of the furnace body 1,
The air can be brought into contact with the surface 11a of the opening / closing lid 11 of the retort 2 corresponding to the portion where the vacuum seal 10 is provided, over an effective area. The gap S4 is an annular one formed between the cylindrical surface of the heat insulator body 13 and the cylindrical surface of the furnace body 1. One end of the gap S4 is
3 and the other end is connected to an air-cooling blower via a pipe 16 connected to the bottom 5b of the furnace body 5, and the cooling air supplied to the gap S3 is introduced into the gap S4 to generate air. So that a flow can be formed.

In the retort furnace having such a cooling structure, when the inside of the furnace body 1 is evacuated by operating a blower (not shown) while performing various heat treatments including degreasing, the negative pressure of the furnace body 1 is reduced by the negative pressure. Air is sucked into the gap S3 through the opening 15 provided in the opening / closing lid 6, and the air effectively comes into contact with the opening / closing lid 11 of the retort 2, and then flows through the gap S4 to form a pipe 16
More outflow. Therefore, the vacuum seal 10 can be air-cooled to a temperature at which its function can be maintained, and at the same time, the heat that is going to be transmitted from the retort 2 to the furnace body 1 via the heat insulating material 4 is simultaneously carried out of the furnace by the air flow. In addition, the situation where the surface of the furnace body 1 rises can be effectively prevented, and the working environment can be improved. In addition, if the heat storage amount of the furnace body 1 is reduced and the gap S4 capable of forming an air flow is formed in this manner, the forced cooling in which the intense blower (not shown) is operated after the heat treatment and suction is performed from the blower tube 8 is also performed. Since the cooling rate at the time is also increased, the processing object W can be quickly cooled, taken out of the furnace and moved to the next processing, and the operating efficiency of the furnace can be effectively improved. Further, by adopting such an effective cooling structure, the amount of the relatively fragile and expensive heat insulating material 4 can be reduced as compared with the configuration of FIG. 2, so that the initial cost and running cost of the furnace are reduced. It is also possible to reduce the number.

The specific configuration of each part is not limited to only the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the pipe 16 for the air cooling blower and the blower pipe 8 for the strong cooling blower are also used and switched by a damper on the way, or coaxially out of the furnace body 1. The configuration and the like can be effectively adopted.

[0013]

According to the present invention, as described above, a gap is provided between the heat insulating material and the furnace body, and the cooling air after passing around the seal is introduced into the gap to form an air flow. It was made. For this reason, cooling for the vacuum seal and cooling for the furnace body can be effectively performed through the same air-cooling system, and proper heat treatment performance without binder condensation due to water cooling is maintained while ensuring the function of the vacuum seal. At the same time, the furnace can be prevented from overheating, and the working environment can be made extremely favorable. In addition, this reduces the amount of heat stored in the furnace body and secures a flow path for air, so that it is possible to effectively perform rapid cooling after heat treatment so that processed materials can be taken out quickly and improve the operating efficiency of the furnace. Can be.
Further, since it is not necessary to use a large amount of heat insulating material as in the related art, initial costs and running costs can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing one embodiment of the present invention.

FIG. 2 is an overall vertical sectional view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Furnace body 2 ... Retort 3 ... Heater 4 ... Heat insulation material 5 ... Furnace body main body 6 ... Opening / closing lid of furnace body 9 ... Retort main body 10 ... Vacuum seal 11 ... Opening / closing lid of retort 13 ... Heat insulation material main body 14 ... Insulation material Opening / closing lid S1: Heat treatment room S2: Heating space S3: Gap S4: Gap W: Processed material

Claims (1)

[Claims] 1. A retort capable of evacuating an internal heat treatment chamber, a heater disposed around the retort to form a heating space inside, and a heat insulator disposed at a position surrounding the heating space including the heater. The retort, the heat insulating material and the furnace body are respectively composed of a main body and an opening / closing lid, so that the processed material can be taken in and out of the heat treatment chamber. Among these, the opening / closing lid of the retort and the retort main body Between the retort and the open / close lid of the furnace body, a gap for air cooling the vacuum seal is provided, and a heat insulating material is provided. A retort furnace having a gap between a main body and a furnace body for introducing cooling air supplied to the gap to form an air flow.