JPH053896U - Sealing mechanism for doors in heat treatment furnace - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a sealing mechanism for an opening / closing door in a heat treatment furnace, which has a good sealing property between a furnace body around the opening and an opening / closing door for sealing the opening. is there. According to the present invention, a double packing formed of an inner hard packing and an outer soft packing is interposed between a furnace body around an opening and an opening / closing door for sealing the opening. Is characterized by.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing mechanism for an opening / closing door in a heat treatment furnace. Various types of heat treatment furnaces such as vertical furnaces, horizontal furnaces, continuous furnaces, batch furnaces, atmosphere furnaces, vacuum furnaces, etc. are widely used for heat treatment of materials such as metal materials and ceramics materials. These heat treatment furnaces have openings for loading and unloading the material to be treated, repairs in the furnace, etc., and an opening / closing door for sealing the opening is attached to the opening. . By the way, between the furnace body around the opening and the opening / closing door for sealing the opening, it is required to be sufficiently sealed in order to prevent heat loss and maintain the atmosphere in the furnace. The present invention relates to a sealing mechanism for an opening / closing door in a heat treatment furnace, which meets such a demand.

[0002]

[Prior Art]

 BACKGROUND ART Conventionally, as a sealing mechanism for an opening / closing door in a heat treatment furnace, one having a hard packing interposed between a furnace body around an opening and an opening / closing door for sealing the opening has been used. However, the conventional sealing mechanism as described above has a drawback in that the hermeticity is poor because the space between the furnace body around the opening and the opening / closing door is sealed only by the hard packing.

[0003]

[Problems to be solved by the device]

 The problem to be solved by the present invention is that the conventional sealing mechanism has poor sealing performance.

[0004]

[Means for Solving the Problems]

 The present invention, therefore, comprises a double packing formed of a hard packing inside and a soft packing outside between the furnace body around the opening and the opening / closing door for sealing the opening. The present invention relates to a mechanism for closing an opening / closing door in a heat treatment furnace.

In the present invention, both the inner hard packing and the outer soft packing may be attached to the furnace body around the opening, or both may be attached to the opening / closing door. One may be attached to the furnace body around the opening and the other to the open / close door. Molded products such as asbestos fiber, graphite fiber, and metal can be used as the inner hard packing, and molded products such as silicone rubber and neoprene rubber can be used as the outer soft packing. However, as will be described later, since the outer soft packing exhibits a secondary sealing property, a hollow molded product having a good shape-restoring property is preferable.

In the present invention, the inner hard packing exhibits primary airtightness and heat insulation with respect to the atmosphere in the furnace, and the outer soft packing is secondary to the atmosphere in the furnace that partially leaks from the hard packing. Exhibits hermeticity. Therefore, according to the present invention, the hermeticity between the furnace body around the opening and the opening / closing door for sealing the opening is good.

[0007]

【Example】

 FIG. 1 is a cross-sectional view showing an embodiment of the present invention. The furnace body 11 is composed of a furnace shell 12 and a heat insulating material 13 lined in the furnace shell 12. An opening 21 is opened in the furnace body 11, and an opening / closing door 31 is attached to the opening 21. The opening / closing door 31 is composed of a frame body 32 and a heat insulating material 33 supported by the frame body 32. There is. A double packing formed by a hard packing 41 on the inner side and a soft packing 51 on the outer side is interposed between the frame 11 around the opening 21 and the opening / closing door 31.

The inner hard packing is formed in a substantially rectangular cross section, and is fitted in a ring-shaped recess 42 formed in the furnace shell 12 as a whole, and its tip end surface contacts the frame body 32. Have been combined. The outer soft packing is formed in a substantially rhombic shape having a hollow cross section, and is fitted in a ring shape as a whole into a hook portion 52 projecting from the frame body 32, and its front end surface is attached to the furnace shell 12. It is joined.

[0009]

[Effect of the device]

 As is apparent, the present invention described above has an effect that the hermeticity between the furnace body around the opening and the opening / closing door for closing the opening is good.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

[Explanation of symbols]

11 ... Furnace body, 21 ... Opening, 31 ... Opening / closing door,
41 ... Hard packing, 51 ... Soft packing

Claims (1)

[Claims for utility model registration] [Claim 1] A double packing formed by an inner hard packing and an outer soft packing is provided between a furnace body around an opening and an opening / closing door for sealing the opening. A sealing mechanism for an opening / closing door in a heat treatment furnace, which is characterized by being interposed.