JPH05133684A - Heating furnace - Google Patents

Abstract

PURPOSE:To obtain a heating furnace, simple in structure, capable of obtaining sufficient uniform heat and easy in heating and heat-treatment works. CONSTITUTION:A sheath heater 2 is inserted into a furnace body 1, having a space therein, from one side thereof to provide the heater 2 on the bottom of the furnace body 1 while a work 4 to be heated is inserted into the furnace body 1 from the other side of the same. The furnace body is closed by a lid body 5 and the sheath heater 2 is excited to heat the inside of the furnace body 1 with uniform heat and effect the heating and/or heat treatment of the work 4 to be heated. On the other hand, air A can be introduced into the furnace body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating furnace for heating and heat-treating an object to be heated.

[0002]

2. Description of the Related Art Large diameter sheath thermocouples have improved characteristics,
In order to improve stability, it is necessary to perform heat treatment after manufacturing.

Conventionally, a heater is wound around the inside or outside of the furnace body, and an object to be heated is provided inside the furnace body for heat treatment.

[0004]

In such a conventional heating furnace, it takes time and effort to wind the heater around the furnace body, and it becomes large in size, and the heating and heat treatment operations are complicated.

In view of the above points, an object of the present invention is to provide a heating furnace having a simple structure, sufficient heating can be obtained, and heating and heat treatment operations are easy.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a sheathed heater is inserted from one side of a furnace body having a space inside and is provided at the bottom of the furnace body, and an object to be heated is inserted into the inside from the other side of the furnace body. It is a heating furnace that is closed with a lid.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional explanatory view seen from the side, showing an embodiment of the present invention, and FIG. 2 is a sectional explanatory view seen from the front.

In FIG. 1, reference numeral 1 denotes a long furnace body made of a metal tube such as stainless steel, and several long sheath heaters 2 are inserted from one side thereof through an outer plate 11 to form a furnace. It is provided on the bottom of the body 1 along the longitudinal direction. An opening 11 a is provided in the outer plate 11 on one side of the furnace body 1, and a heat insulating material 3 is provided between the outer plate 11 and the partition plate 12. The sheathed heater 2 is like a metal pipe in which a heater is put and an insulating agent is sealed.

Then, a handle 5 is provided at the opening on the other side of the furnace body 1.
A lid 5 having a is detachably provided, and several objects to be heated 4 such as a sheath thermocouple are inserted on the sheath heater 2 inside thereof. On the other side of the furnace body 1 where the lid body 5 is provided, an inlet port 14 for introducing nitrogen or other atmospheric gas A into the furnace body 1 is provided, and an appropriate outer cylinder (not shown) is provided outside the furnace body 1. The heat insulating material 6 is provided so that it is held in place.

As described above, the object 4 to be heated is easily inserted into the inside of the furnace body 1 and sealed with the lid 5 to energize the sheath heater 2 to generate heat. The uniform heating is performed in the longitudinal direction due to the cavity radiation effect and the like, so that heating and heat treatment of the elongated object 4 can be effectively performed. Further, the atmospheric gas A can be introduced from the inlet 14 on the other side and allowed to escape from the opening 11a of the outer plate 11 on the one side, so that the furnace can be used as a heat treatment furnace in a specific atmosphere. Since the sheath heater 2 is used, the object to be heated 4
Insulation is maintained even when contacted with.

FIG. 3 is a sectional view showing another embodiment of the present invention as seen from the front. In this example, an inner cylinder 7 made of metal or the like having good heat conduction is provided inside the furnace body 1, and the inner cylinder 7
An object to be heated 4 is provided inside and is heated by an external sheath heater 2. Therefore, it is possible to further equalize the temperature, and it is easy to take in and out the object to be heated 4.

[0012]

As described above, since the sheathed heater is inserted from one side of the furnace body to heat the object to be heated inside, the structure is simple, the manufacturing is easy, and the object to be heated is heated. It is easy to take things in and out. In addition, the inside of the furnace body is brought into a sufficient soaking state due to the cavity radiation effect and the like, and in particular, a sufficient soaking state is obtained even in the longitudinal direction, and heating and heat treatment of a long object can be favorably performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of the present invention as seen from a side surface direction.

FIG. 2 is a sectional explanatory view showing an embodiment of the present invention as seen from the front direction.

FIG. 3 is a cross-sectional explanatory view as seen from the front, showing another embodiment of the present invention.

[Explanation of symbols]

 1 Furnace Body 2 Sheath Heater 3 Insulation Material 4 Heated Object 5 Lid Body 6 Insulation Material 7 Inner Cylinder

Claims (2)

[Claims] 1. A furnace body having a space inside, a sheath heater which is inserted from one side of the furnace body and is provided at the bottom of the furnace body, and an object to be heated is inserted into the inside from the other side of the furnace body. A heating furnace with a lid that closes. 2. The heating furnace according to claim 1, wherein an inner cylinder for inserting an object to be heated is provided inside the furnace body.