SU905600A1

SU905600A1 - Furnace for chemical thermic treatment of articles

Info

Publication number: SU905600A1
Application number: SU792849127A
Authority: SU
Inventors: Марк Борисович Гутман; Владимир Федорович Ефимов; Вячеслав Владимирович Филиппов
Original assignee: Предприятие П/Я Г-4696
Priority date: 1979-08-29
Filing date: 1979-08-29
Publication date: 1982-02-15

Description

(54) ПЕЧЬ ДЛЯ ХИМИКО-ТЕРМИЧЕСКОЙ ОБРАБОТКИ(54) FURNACE FOR CHEMICAL-THERMAL TREATMENT

ИЗДЕЛИЙPRODUCTS

1one

Изобретение относитс к электротермии и может быть использовано, в частности в печах с принудительной циркул цией атмосферы , примен емых дл термической и химико-термической обработки изделий.The invention relates to electrothermal and can be used, in particular, in furnaces with forced circulation of the atmosphere, used for thermal and chemical-thermal treatment of products.

Известна электрическа конвективна печь дл термической обработки изделий, содержаща футерованную камеру, нагреватели , вентил торы, нагнетательные газоподвод шие каналы и заслонки, выполненные с возможностью поворота дл создани равномерного температурного режима по всему объему печи (1.The known electric convective furnace for heat treatment of products includes a lined chamber, heaters, fans, gas injection channels and flaps that can be rotated to create a uniform temperature throughout the furnace (1.

Недостатками этой печи вл ютс невозможность получить эффект выравнивани скоростей газа по сечению рабочего пространства на входе газа в загрузку и мала надежность устройства из-за возможной деформации поворотных заслонок и выхода из стро узла их поворота.The disadvantages of this furnace are the inability to obtain the effect of equalizing gas velocities over the cross section of the working space at the gas inlet into the load and the low reliability of the device due to the possible deformation of the butterfly valves and the failure of their rotation.

Наиболее близкой по технической сущности и достигаемому результату к предлагаемой вл етс печь дл химико-термической обработки изделий, содержаща футерованную камеру с расположенными в ней вентил тором и циркул ционными нагнетательными и газоподвод щими каналами 2.The closest to the technical essence and the achieved result to the proposed is a furnace for chemical-heat treatment of products, containing a lined chamber with a fan located in it and circulating injection and gas supply channels 2.

Недостатком такой печи вл етс неравномерное распределение газового потока в сечении на входе потока в рабочее пространство печи. Это приводит к тому, что различные части загрузки наход тс в неодинаковых услови х термообработки. Вследствие этого происходит образование неравномерного температурного пол по загрузке, что значительно ухудщает качество термообработки изделий и снижает технико-экономические показатели печи.The disadvantage of such a furnace is the uneven distribution of the gas flow in the cross section at the inlet of the flow into the working space of the furnace. This leads to the fact that the different parts of the load are in different heat treatment conditions. As a consequence, the formation of uneven temperature floor loading, which significantly impairs the quality of heat treatment of products and reduces the technical and economic performance of the furnace.

Цель изобретени - повыщение качества обрабатываемых изделий за счет выравнивани скоростей газового потока в рабочем пространстве печи.The purpose of the invention is to increase the quality of processed products by equalizing the gas flow rates in the furnace working space.

15 Поставленна цель достигаетс тем, что печь дл химико-термической обработки изделий, содержаща футерованную камеру с расположенными в ней вентил торами , нагнетательными и газоподвод щими15 This goal is achieved by the fact that a furnace for chemical-heat treatment of products, containing a lined chamber with fans, injection and gas supply located therein

2Q каналами, снабжена экранами, установленными в противоположных углах нагнетательного .канала, перекрывающими газоподвод щий канал по щирине.2Q channels provided with screens installed in opposite corners of the injection channel, blocking the gas supply channel along the width.

Claims

FIG. 1 shows a furnace for chemical processing of products, a horizontal section; in fig. 2 shows section A-A in FIG. 1. The furnace contains a lined chamber 1 inside which a centrifugal type fan 2 and circulation channels are located: pressure 3 and gas supply 4. To improve the processing conditions of the products, openings for the flow of atmosphere from the pressure channel to the gas supply for not less than half of the gas supply channel 5 are blocked by screens 5 and are located in opposite corners along one of the diagonals of the discharge channel. The furnace works as follows. The load enters the heating chamber 1, where, under conditions of forced circulation, the process of chemical-thermal treatment begins. The directional circulation of the atmosphere is carried out by means of a centrifugal fan 2. The gas flow from the inlet duct 3 enters the gas supply ducts 4 through openings not closed by screens 5. At the same time, the velocity profile of the gas flow at the exit from the gas supply channels before entering the heating chamber is significantly different from the uniform one. The peculiarity of the distribution of gas velocities before entering the heating chamber is that the velocity profiles in the opposite gas supply channels are inverse to each other, and if at the end of one of the channels there are maximum velocities, then in the opposite channel the same end is minimal, and vice versa. This distribution of the gas flow in the gas supply channels allows the velocity profile of the circulating gas to even out at the entrance to the working space, since in this case the flows merge and the velocity profiles sum up: the maximum speeds are added to the minimum and vice versa. Thus, the velocity profile directly in front of the gas inlet into the working space can be significantly aligned. This helps to maintain the same process conditions for products located in different parts of the sections of the furnace working chamber. The technical and economic effect of using the proposed furnace is obtained by increasing the service life of products subjected to chemical and thermal treatment, and it amounts to 300,000 r. in year. The invention of the furnace for chemical-heat treatment of products, containing a lined chamber with fans, injection and gas supply channels located in it, in order to improve the quality of the processed products by equalizing the gas flow rates in the furnace working space equipped with screens installed in opposite corners of the injection channel, covering the gas supply channel in width. Sources of information taken into account in the examination 1. USSR author's certificate number 576508, cl. F 27 B 9/26, 1977.

2. USSR author's certificate number 441358, cl. From 21 D to 9/00.