JPH0354135Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a direct-fired tempering furnace equipped with a charging chamber for vaporizing and removing quenching oil adhering to the surface of a treated material.

(Prior art) Conventionally, as a direct-fired tempering furnace of the above type,
There is one described in Publication No. 53-5969.

This direct-fired tempering furnace is equipped with a preheating zone having an exhaust port in the front part of the heating zone of the tempering furnace, allowing the exhaust gas from the heating zone to pass through and effectively using it as preheating gas. An air nozzle for supplying fresh air and a burner are provided, and the quenching oil adhering to the surface of the quenching member, which has been vaporized by the preheating effect, is completely combusted by the burner flame and discharged.

(Problem to be solved by the invention) According to this direct-fired tempering furnace, the oil adhering to the quenching member is burned off (heated and vaporized) in the preheating zone, so unlike the conventional quenching furnace, There is no need to provide a cleaning device between the cleaning device and the tempering furnace, the installation space can be minimized, and there is no need for troublesome post-treatment such as drainage treatment after cleaning.

However, the combustion exhaust gas in the preheating zone is immediately exhausted from the exhaust port, that is, without the heat of the exhaust gas being fully utilized. In addition, since air is supplied to the preheating zone, the treatment material is likely to be oxidized due to burning of oil adhering to the surface of the treatment material, and therefore, there is a new problem in that it is troublesome to control the supplied air.

Therefore, the present invention aims to provide a direct-fired tempering furnace that does not require a cleaning device and is free from the risk of oxidation of the treated material, as well as the above-mentioned conventional method, and which effectively utilizes the calorific value of the oil fume. purpose.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a furnace partition door on the charging side of a direct-fired tempering furnace to separate the charging chamber and the heating chamber. The charging chamber is provided with a direct flame burner and a ceiling circulation fan, and the hearth has an opening communicating with the charging chamber and an exhaust passage communicating with the heating chamber, and A fume combustion chamber is formed with an air supply port, and an exhaust duct is provided on the charging chamber side of the heating chamber to introduce the combustion exhaust gas of the fume into the heating chamber.

(Example) Next, an example of the present invention will be described with reference to the drawings.

T is a direct-fired tempering furnace, which is composed of a charging chamber (burn-off chamber) 1 and a heating chamber 11, and the treated material W transported from a hardening furnace (not shown) is preheated in the charging chamber 1. The adhering quenching oil is vaporized and removed in heating chamber 1.
1, and a predetermined tempering process is performed.

The charging chamber 1 is partitioned by a furnace partition door 2, and has an open flame burner 3 and a ceiling circulation fan 4.

In addition, the hearth part 5 includes an opening 6 communicating with the charging chamber 1, a direct fire burner 9 disposed on the side of the opening 6, and a fume combustion chamber 1 equipped with an air supply port (not shown).
0 is formed, and an exhaust passage 8 communicating with the heating chamber 11 is arranged on the opposite side of the fume combustion chamber 10 from the burner.

On the other hand, in the heating chamber 11, there is an atmosphere forced circulation device 1 comprising an open flame burner 12, a blower 13 having a large number of jet nozzles 14 on the lower surface, and a circulation fan 15.
6 and an exhaust duct 17 are provided.

In addition, 18 is a conveyance roller, 19 is a charging door, 2
0 is an extraction door, and 21 is a partition wall in the furnace.

The internal structure of the heating chamber 11 is the same as that of a conventionally known tempering furnace, so a description thereof will be omitted.

In the tempering furnace T having the above configuration, the treated material W charged into the charging chamber 1 and to which quenching oil is attached is preheated to approximately 350°C by the direct burner 3, and the quenching oil is burn-off (heated and vaporized). be done. The combustible exhaust gas containing a large amount of oil fume generated at this time enters the fume combustion chamber 10 maintained at about 800° C. by the direct fire burner 9 through the opening 6 by the suction action of the exhaust gas duct 17, and is combusted. In the chamber 10, a predetermined amount of secondary air is supplied from an air supply port and is completely combusted while passing through the fume combustion chamber 10 and the exhaust passage 8.

Thereafter, this high-temperature combustion exhaust gas reaches the heating chamber 11 through the opening 7 of the exhaust path 8, is sucked together with other furnace gases into the exhaust gas 13 by the action of the circulation fan 16, and is ejected from the ejection nozzle 14 to the quenched member W. Ru.

(Effects of the invention) As is clear from the above explanation, according to the invention, the oil fume generated in the charging chamber is combusted in the fume combustion chamber outside the charging chamber, so the quenching member is heated by the secondary air. There is no oxidation at all. Moreover,
The high-temperature exhaust gas from this fume combustion chamber reaches the heating chamber, where it is effectively used to heat the quenched parts.
The amount of heat required to heat the material can be reduced by approximately 20%.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a direct-fired tempering furnace according to the present invention, and FIG. 2 is a sectional view taken along the line -- in FIG. DESCRIPTION OF SYMBOLS 1... Charging chamber, 3... Direct flame burner, 5... Hearth part, 6, 7... Opening, 8... Exhaust passage, 9... Direct flame burner, 10... Huyum combustion chamber, 11... ...Heating chamber, 12...Direct fire burner.

Claims (1)

[Scope of utility model registration request] A furnace partition door is provided on the charging side of the direct-fired tempering furnace to divide the furnace into a charging chamber and a heating chamber, and the charging chamber is provided with a direct-fired burner and a ceiling circulation fan,
While forming a hume combustion chamber in the hearth part, which has an opening that communicates with the charging chamber and an exhaust path that communicates with the heating chamber, and is equipped with a direct flame burner and an air supply port,
A direct-fired tempering furnace characterized in that an exhaust duct is provided on the charging chamber side of the heating chamber to introduce fume combustion exhaust gas into the heating chamber.