RU2736465C1 - Oven for roasting and drying - Google Patents

Abstract

FIELD: furnaces and ovens.

SUBSTANCE: disclosed is a kiln for roasting and drying, comprising a body and a heater, which is equipped with a container for burning and drying, made with a housing of plate steel and installed in the housing of the furnace, wherein furnace housing consists of welded frame, in which two layers of heat-insulating material are laid, and along inner perimeter of furnace housing there is a chute with filled with quartz sand to provide a gate between furnace housing and container for roasting and drying by exhaust fan. Furnace body is made with base, which is heater, and with cover, having welded structure, inside which two layers of heat-insulating material are laid, seal between cover and container body in form of sand stopper, coarse filter, made with possibility of connecting by flange to shop ventilation, mechanism of cover opening in the form of lifting levers actuated by two hydraulic cylinders, cover fixing mechanism and separate hydroelectric station for actuation of cover lifting hydraulic cylinders connected to furnace by high pressure sleeves and consisting of electric motor, gear wheel pump, electrohydraulic distributor, having housing and made with possibility of electromagnetic control. In the housing of the electrohydraulic distributor there is a slide valve with a centring spring for the slide valve return from the working position to the neutral one, which is made with possibility of electric control, pressure hydraulic valve to limit pressure of working fluid and unload hydraulic system in idle mode of continuous drain of working fluid, oil tank with filter and system of pipelines. Furnace is equipped with a separate heating mode control cabinet, connected to the furnace power and measuring wires, laid separately in cable-channel 1 and cable-channel 2 or in protective sleeves, and having a control panel with a furnace start button, a control, setting, limiting and automatically maintaining the required temperature in the furnace, a temperature indicator, temperature control sensors and tumbler, which starts the program of heater and exhaust fan operation duration and automatic regeneration of firing or drying at emergency shutdown of control cabinet.

EFFECT: technical result consists in creation of oven for burning and drying insulation of windings of electric motors without air access for the purpose of its destruction, as well as drying of windings after impregnation.

1 cl, 7 dwg

Description

The invention relates to electrothermal equipment designed for firing the insulation of electric motor windings without air access for the purpose of its destruction, as well as drying the windings after impregnation.

Known electric resistance furnace from the materials of the book "Thermal calculations of metallurgical furnaces" edited by A.S. Telegin, 2nd edition. M .: metallurgy, 1982, p. 343, fig. 63. UDC 669.04.

The electric resistance furnace contains a lined chamber with a roof, heaters located on the walls of the chamber, a hole for exhausting gases.

The disadvantage of the technical solution is the incomplete afterburning directly in the electric furnace of the gases formed during the firing of the insulation of the windings of electrical machines (for their secondary use), as well as additional energy consumption for their afterburning.

Known electric resistance furnace, consisting of a lined chamber with a vault, heaters located on the walls of the chamber, a hole for exhausting gases, equipped with a torch burner, a pipe for supplying oxygen-containing gas and located under the roof, a heat-resistant hollow element, one end of which, inlet, communicates with the lined chamber, and the other - with a hole for exhausting gases, while the torch burner and the branch pipe are located opposite the inlet of the full element. (Patent No. 2125692 "Electric resistance furnace" authors: Evsyukov V.N., Kozlov D.D., Shaforostov V.P., Bubnov S.Yu., Sinitskiy VB, publ. 27.01.1999).

The disadvantage of the technical solution is that this technical solution allows only firing the insulation of the windings of electrical machines, without ensuring the uniformity of firing the insulation.

The closest analogue of the claimed invention in technical essence is a furnace known from RU No. 2125692 C1, F27B 5/00, 01/27/1999.

The object of the invention is to provide a kiln for firing and drying, designed for firing the insulation of windings of electric motors without access to air in order to destroy it, as well as drying the windings after impregnation.

The task is achieved in that the kiln for roasting and drying, containing a body and a heater, characterized in that it is equipped with a container for roasting and drying, made with a body made of thick sheet steel and installed in the body of the kiln, while the body of the kiln consists of a welded frame, in which two layers of heat-insulating material are laid, and along the inner perimeter of the furnace body there is a groove filled with quartz sand to provide a seal between the furnace body and the container for firing and drying, an exhaust fan, while the furnace body is made with a base, which is a heater, and with a cover having a welded structure, inside which two layers of heat-insulating material are laid, a seal between the lid and the container body in the form of a sand seal, a coarse filter made with the possibility of connecting by means of a flange to the workshop ventilation, a mechanism for opening the lid in the form of lifting levers actuated two hydraulic cylinders, mechanism fixing the cover and a free-standing hydraulic station for actuating the hydraulic cylinders for lifting the cover, connected to the furnace by high-pressure hoses and consisting of an electric motor, a gear pump, an electrohydraulic distributor having a housing and made with the possibility of electromagnetic control, while a spool with a centering spring is installed in the body of the electrohydraulic distributor, to return the spool from the working position to the neutral, made with the possibility of electrical control, a pressure hydraulic valve for limiting the pressure of the working fluid and unloading the hydraulic system in idle mode, continuous draining of the working fluid, an oil tank with a filter and a pipeline system, and a free-standing control cabinet for heating modes connected with a furnace, power and measuring wires laid separately in the cable - channel 1 and cable - channel 2 or in protective sleeves and having a control panel with a button for turning on the furnace, a regulator setting, limiting which automatically maintains the required temperature in the furnace, a temperature indicator, temperature control sensors and a toggle switch that starts the program for the duration of the heater and the exhaust fan and automatic resumption of firing or drying in case of emergency shutdown of the control cabinet.

The positive effect of the invention is manifested in the fact that the proposed technical solution to create a furnace designed for firing winding insulation allows you to create a furnace for firing and drying the insulation of electric motor windings without air access in order to destroy it, as well as drying the windings after impregnation.

The essence of the claimed invention is illustrated by drawings, where:

FIG. 1 - Three-dimensional model of the overall structure of the furnace;

FIG. 2 - Three-dimensional model of the lid opening mechanism;

FIG. 3 - Three-dimensional model of the lid fixing mechanism;

FIG. 4 - 3D model of the sand trough (gate) between the body and the cover.

FIG. 5 Hydraulic schematic diagram

FIG. 6 Electrical schematic diagram

FIG. 7 Wiring diagram

The kiln for roasting and drying (Fig. 1) contains a body 3 and a heater 4. The kiln is equipped with a container for roasting and drying 1, which is made with a body made of steel plate and installed in the body of the kiln 3, while the body of the kiln 3 consists of a welded frame, in which two layers of heat-insulating material are laid, and along the inner perimeter of the furnace body there is a groove filled with quartz sand 11 (Fig. 4) to provide a shutter between the furnace body 3 and the container for firing and drying 1, an exhaust fan, while the furnace body 3 is made with a base, which is a heater 4, and with a cover 8 having a welded structure, inside which two layers of heat-insulating material are laid, a seal between the cover and the container body in the form of a sand seal, a coarse filter 2, which is made with the possibility of connecting by means of a flange to the workshop ventilation , a cover opening mechanism (Fig. 2) in the form of lifting levers 7, actuated by two hydraulic cylinders 9, a mechanism f lid 10 (Fig. 3). Separately, there is a hydraulic station 6 for actuating the hydraulic cylinders for lifting the cover 9, which is connected to the furnace by high-pressure hoses and consists of an electric motor, a gear pump, an electro-hydraulic distributor having a housing and made with the possibility of electromagnetic control, while a spool with a centering spring is installed in the body of the electro-hydraulic distributor, to return the spool from the working position to the neutral, made with the possibility of electrical control, a pressure hydraulic valve for limiting the pressure of the working fluid and unloading the hydraulic system in idle mode, continuous draining of the working fluid, the oil tank with the filter and the pipeline system. There is also a separate control cabinet for heating modes 5, which is connected to the furnace with power and measuring wires laid separately in cable - channel 1 and cable - channel 2 or in protective sleeves, and has a control panel with a button for turning on the furnace, a regulator that sets, limits and automatically maintains the required temperature in the furnace, a temperature indicator, temperature control sensors and a toggle switch, which starts the program for the duration of the heater and the exhaust fan and automatic resumption of firing or drying in case of emergency shutdown of the control cabinet.

The kiln for roasting and drying works as follows.

1. We turn on the introductory machine on the control cabinet of the furnace 5 (hereinafter SHU).

2. Press the "Open" button on the SHU 5 panel (and hold it until the required opening of the lid), while the hydraulic station 6 included in the furnace automatically turns on and the lid 8 is lifted.

When the hydraulic station is automatically turned on, the oil flows through the discharge channels into one of the cavities of the hydraulic cylinders 9, driving the hydraulic cylinder rods in motion, and from the second cavity of the hydraulic cylinders it is drained into the tank. Using the mechanism for opening the cover of the furnace, which is a lifting levers 7, open the cover of the furnace 8, fixing in the open position using the locking mechanism 10 (Fig. 3).

3. Load the windings of used electrical machines, with residual insulation and subject to firing, or products to be dried after impregnation, into a container

4. By pressing and holding the "Close" button on the SHU 5 panel, close the furnace cover 8. When the "Close" button is pressed, the hydraulic station 6, which is an integral part of the furnace, turns on automatically and the cover 8 closes.

5. Close the oven with lid 8, having previously pulled out the latch to the extreme left position.

6. On the control cabinet panel 5, set the drying / firing parameters and switch the toggle switch, which starts the program for the duration of the heater and the exhaust fan and the automatic resumption of firing or drying in case of emergency shutdown of the control cabinet. After setting all the parameters of the furnace, turn on the furnace by pressing the "START" button.

7. The oven automatically performs drying / firing according to the set program.

8. The stove is turned off:

- automatically at the end of the technological cycle;

- by pressing the STOP button.

9. At the end of the oven cycle and after it has cooled down, open the lid (as described above), unload the container (take out the processed products).

Thus, the proposed design of the kiln for firing and drying makes it possible to create a kiln designed for firing the insulation of electric motor windings without air access in order to destroy it, as well as drying the windings after impregnation.

Claims (1)

Furnace for roasting and drying, containing a body and a heater, characterized in that it is equipped with a container for firing and drying, made with a body made of steel plate and installed in the body of the furnace, while the body of the furnace consists of a welded frame in which two layers of heat-insulating material, and a chute filled with quartz sand is made along the inner perimeter of the furnace body to provide a shutter between the furnace body and the container for firing and drying, while the furnace is equipped with an exhaust fan, the furnace body is made with a base, which is a heater, and with a lid having a welded a structure, inside which two layers of heat-insulating material are laid, a seal between the lid and the container body in the form of a sand seal, a coarse filter made with the possibility of being connected by a flange to the workshop ventilation, a mechanism for opening the lid in the form of lifting levers actuated by two hydraulic cylinders, a mechanism fixing the cover and separately a standing hydraulic station for actuating the hydraulic cylinders for lifting the cover, and the hydraulic station is connected to the furnace by high-pressure hoses and consists of an electric motor, a gear pump, an electro-hydraulic distributor having a housing and made with the possibility of electromagnetic control, while a spool with a centering spring is installed in the body of the electro-hydraulic distributor to return the spool from the working position to the neutral, made with the possibility of electrical control, a pressure hydraulic valve for limiting the pressure of the working fluid and unloading the hydraulic system in idle mode, continuous draining of the working fluid, an oil tank with a filter and a pipeline system, and a free-standing control cabinet for heating modes connected to the power furnace and measuring wires laid separately in the cable channel 1 and cable channel 2 or in protective sleeves, and having a control panel with a button for turning on the furnace, a regulator, setting, limiting and automatic which maintains the required temperature in the furnace, a temperature indicator, temperature control sensors and a toggle switch that starts the program for the duration of the heater and the exhaust fan and automatically resumes firing or drying in case of emergency shutdown of the control cabinet.

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