JPS60238426A - Gas seal device - Google Patents

Abstract

PURPOSE:To provide the titled gas seal device exhibiting powerful sealability without reducing the internal pressure of a furnace by forming a suction port between slit-shaped ejection nozzles which are opposed to a material to be heated and arranged in two rows at specified intervals, and circulating the gas sucked in from the suction port by a fan to the ejection nozzles. CONSTITUTION:The gas which is sucked in from suction ports 9a and 9b by operating a circulating fan 10 is forced into chambers 5a, 5b, 6a, and 6b, and ejected from ejection nozzles 7a, 8a, 7b, and 8b. Consequently, a gas current toward the suction port 9a from the nozzles 7a and 8b is produced on the upper surface of a material 2 to be heated, and a gas current toward the suction port 9b from both nozzles 7b and 8b is also generated on the lower surface of the material 2 to be heated. Consequently, powerful sealing action is exhibited by said gas currents. Meanwhile, in the figure, 1 shows the furnace body, and 11 shows wind- direction guide plates provided inside of an inlet and outlet port 12 of the material to be heated in the throat 4.

Description

Detailed Description of the Invention [Industrial Field of Application] Industrial stools that continuously heat-treat objects to be heated, such as metal strips, prevent the intrusion of outside air and the flow of gas in the furnace at the inlet or outlet of the objects to be heated. Gas seal device to prevent leakage.

[Prior art] A throat is formed outside the opening of the furnace body through which the object to be heated enters and exits, and a blowout nozzle facing both sides of the object to be heated and inclined inward is provided in the throat, and air is emitted from the blowout nozzle. A gas seal device in which an inlet for sucking the gas is formed between the jet nozzle and the opening of the furnace body, and the gas is circulated to the jet nozzle is disclosed in Japanese Patent Publication No. 42-3282 and Japanese Utility Model Publication No. 48-1.
This is known from Publication No. 00802 and the like.

[Problems to be Solved by the Invention] Although the conventional gas seal device described above can be expected to have the effect of preventing outside air from entering through the opening, the inlet is located near the opening of the furnace body. Since the gas inside the furnace is easily sucked and the pressure inside the furnace inevitably becomes low, it is necessary to supply a large amount of atmospheric gas into the furnace in order to maintain the pressure inside the furnace. That is, when the internal pressure of the furnace becomes low, outside air will enter through gaps in the furnace wall, so there is a problem in that a large amount of expensive inert gas or reducing gas is consumed in order to prevent this. The present invention attempts to solve these problems.

[Means for solving the problem] Two rows of slit-shaped jet nozzles facing the object to be heated are formed spaced apart from each other at regular intervals, an air inlet is formed between the jet nozzles, and the air inlet is opened by a fan. The gas sucked from the jet nozzle was circulated to the jet nozzle.

[Operation] Gas blown out from two rows of jet nozzles is sucked in and circulated through the intake port provided between them, providing strong sealing performance without reducing the pressure inside the furnace.

[Example 1] In FIGS. 1 and 2, 1 is a furnace body, 2 is a strip-shaped object to be heated that is conveyed horizontally into the furnace body, and 3 is an opening in the furnace body through which the object to be heated enters and exits. , 4 is a throat formed outside the opening, 5
Reference characters a, 5b, 6a, and 6b are chambers formed in the throat 4, and slit-shaped jet nozzles 7a, 7b, 8a, and 8b are formed on the surface of each chamber facing the object to be heated so as to be inclined inward from each other. do. Reference numeral 9a denotes an intake port formed at an intermediate position between the jet nozzles 7a and 8a and facing the upper surface of the object to be heated 2, and 9b is formed at an intermediate position between the jet nozzles 7b and 8b and faces the lower surface of the object to be heated 2. Reference numeral 10 denotes a circulation fan, the primary side of which is connected to the intake ports 9a and 9b, and the secondary side connected to the chamber 5a.

It is branched and connected to 5b, 6a, and 6b. Reference numeral 11 indicates a wind direction guide plate provided inside the heated object inlet/outlet portion 12 of the throw 1-4. In this case, by driving the circulation fan 10, the gas sucked from the intake ports 9a, 9b is force-fed to the chambers 5a, 5b, 6a, 6b,
, 8a, 7b, and 8b. Therefore, a gas flow is generated from both jet nozzles 7a * 8a toward the intake port 9a on the upper surface of the heated object 2, and both jet nozzles 7 and 7 are generated on the lower surface of the heated object 2.
b.

A gas flow is generated from 8b toward the intake port 9b, and this gas flow provides a strong sealing effect.

[Example 2] In Example 2 shown in FIG. 3, dampers 13a and 13b are provided at the opening edges of the intake ports 9a and 9b, respectively, and the primary side of the circulation fan 10 is connected to the ejection nozzles 7a, 8a, 7b, and 8b.
The other configurations are the same as in the first embodiment.

In this case, if the dampers 13a, 13b are closed, the gas blown out from the jet nozzles 7a, 8b, 7b, 8b will be transferred to the intake port 9a.
,9. As a result, the static gas pressure in this area increases without being sucked from b, making it possible to levitate the heated object 2. Therefore, the damper 13a is used when it is necessary to transport the heated object 2 without contact.

By closing 13b, this gas seal device can be provided with a flotation function depending on the purpose.

[Effects of the invention] Since the intake port is formed between the provided slit-shaped ejection nozzles, high sealing performance can be maintained without suctioning the gas inside the furnace, resulting in reduced consumption of atmospheric gas, etc. Has beneficial effects.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a gas seal device showing Embodiment 1 of the present invention, Fig. 2 is a longitudinal sectional view of the gas seal device showing Embodiment 2 of the present invention, and Fig. 3 is a longitudinal sectional view of the gas seal device showing Embodiment 2 of the present invention. FIG. 1...furnace body, 2...' heated object, 7a, 7b, 8
a+8b...Ejection nozzle, 9a, 9b...Intake port, 10...Circulation fan, 13a, 13b...
・Damper, patent applicant Daido Steel Co., Ltd.

Claims (1)

[Claims] 1. Two rows of slit-shaped ejection nozzles facing the object to be heated are formed at regular intervals, an inlet is formed between the ejection nozzles, and a circulation fan is used to draw air from the inlet. A gas sealing device for a furnace body, characterized in that the sucked gas is circulated through the ejection nozzle. A gas sealing device for a furnace body according to claim 1, characterized in that a damper is provided for the intake air 1-1.