SU792059A1 - Protective-atmosphere furnace discharging port closure - Google Patents

Description

one

The invention relates to the field of mechanical engineering and can be used in the heat treatment of parts in continuous furnaces with a protective environment.

During the heat treatment process, the cooling of the heated to a certain temperature is determined in containers with quenched media.

A device is known for tempering parts in continuous furnaces with a protective medium and a shutter of the discharge opening of the furnace, which consists of a pipe, one end connected to the discharge part of the retort, and the other end to the sensitive container with the quenching medium 1.

The known device does not solve the problem of hardening parts in environments with different cooling rates, in addition, the shutter is connected directly to the quenching tank; The quenching medium vapors enter the furnace space and adversely affect the operation of the furnace, cooling it, which leads to an increase in the power of the retort end heaters, which ultimately leads to overheating and its rapid deterioration.

A shutter is known for a discharge opening of a furnace with a protective atmosphere, containing a quenching bath, a pipe with perimeter holes immersed in a bath, a charging nozzle located along the axis of the pipe, an oil pipe and drain holes 2.

A disadvantage of the known solution is that the quenching vapors vapors enter the working chamber of the furnace and, as a result, the hermetic sealing of the discharge window is low.

The aim of the invention is to increase sealing by reducing the ingress of quenching medium into the furnace space.

The goal is achieved by the fact that the shutter is provided with an additional annular Кс1м2020, coaxially located with the pipe, with a hollow bottom in the upper part, into the cavity of which the coolant inlet and outlet pipes are embedded.

In the drawing. Depicts the device 25 shutter, in section.

Claims (2)

The shutter has a chamber 1, the upper wall 2 of this chamber is the base of a water cooler 3 with inlet 4 and outlet 5 nozzles 30 for water. A nozzle 6 with a flange 7 is located in the center of the upper wall of chamber i for connecting it to a furnace with a protected environment. Under the pipe b, a pipe 8 with holes 9 is attached to release the quenching vapors. Pipe 8 oil pipe.10 connected to the tank 11 with quenching oil. The valve is placed in the tank 12 with the cooling medium. Drainage pipes 13 and 14 with taps are built into the tank. The tube 13 drains the open mirror of the bath, and the tube 14 drains the chamber 1. The drain hole 15 of the tank 12 is protected by a screen 16. The shutter operates as follows. The inlet 4 is connected to the water supply, the valve of the outlet 5 is opened, the water is continuously removed from the refrigerator 3, and the upper wall 2 of chamber 1 is cooled. Into the container 11, the oil is poured to the required level. Inside the I-Shutter chamber, since it is tightly connected to the furnace by a flange 7, there will be an overpressure, as a result of which the water level outside is higher than the mirror on the inside of the shutter. The capacity of the IIdl oil level is higher than in the pipe 8. Hardened parts fall from the retort of the furnace through the pipe 6 directly into the oil. After passing through the oil layer, the parts fall into the quenching medium of tank 12, where the final quenching occurs. When passing through the oil, gases are produced that cannot change the operating mode of the furnace, since, once in the furnace, they are burned in the royal flare. The vapor of the quench medium of tank 12, rising, condenses on the surface of the built-in refrigerator 3. The parts, passing through the oil, are enveloped in the film and, once inside the quenching quenching medium, partially lose it. The pop-up oil is collected either under the chamber 1 or on the surface of the tank 12 mirror. As it accumulates, a layer of oil is released through the drainage pipes 13 or 14 by opening the taps. The screen 16 protects the opening 15 of the tank 12 from oil ingress into it and plays the role of a separator. The use of the device makes it possible to create favorable conditions for the hardening of products, for example, shot: thermal shock is completely eliminated, since the shot immediately falls into the layer of oil; the fraction practically passes through three quenching media and hot water with temperatures up to and cold water from the tank; contamination of the quenching medium with oils is excluded. Claims of the furnace with a protective atmosphere containing a quenching medium bath, a tube immersed in the tub with holes in the upper part, a feed nozzle located along the axis of the pipe, an oil pipe and drain holes, characterized in that sealing the furnace by reducing the ingress of the quenching medium into the furnace; the shutter is provided with a coaxially arranged pipe with an additional annular chamber with a hollow bottom in the upper part, in the cavity of which the inlet and outlet nozzles are embedded aditel. Sources of information taken into account in the examination 1. Metallurgy and thermal processing, 1974, 8, p.40 p.2. 2. USSR author's certificate as per 2448181/02, F 27 D 3/00, 1975. 8 9 tffffffti (ft. Z..L. Jj / "1 16 IS