RU2324881C2 - Device for raising and lowering a furnace door - Google Patents

Abstract

FIELD: heating, furnaces.

SUBSTANCE: invention relates to the heating furnaces equipment. A device comprises door, means of door raising and lowering and followers. The door is made in the form of a lined welded frame with two nozzles welded thereto. The nozzles allow the door to smoothly move with respect to the followers. The door lining projects from the welded frame surface and it is capable of forming a sealed "lock" upon closing the furnace door. The lining on the door back side has a double heat-insulating layer. The followers on the bottom lead-in side are made with a slope of 35°.

EFFECT: improving the reliability of the furnace sealing.

2 cl, 2 dwg

Description

The invention relates to the field of equipment for heating furnaces, in particular to devices that provide effective sealing when closing the furnace shutter, and can be used in color casting workshops.

A known analogue is a device for lifting the damper of a heating furnace (Source of information AS No. 1252638), comprising a damper 11 as in the claimed device, which moves up and down, closing and opening the window of the furnace. The flap in the lower position, as in the filed application for the invention, relies on the window sill (threshold) of the furnace window. The disadvantages are that:

- the device has a damper that does not fit snugly to the window frame of the furnace, and this leads to large heat losses;

- the use of a two-arm leverage system with counterweights makes the design large in size.

Of the known closest in technical essence (prototype) is a device for raising and lowering the furnace shutter (RF patent No. 2229075), containing actuator 8 with flexible coupling 16, a protective screen 27. The common thing in devices is that the shutter moves up and down, opening and closing the oven window. In the raised upper position, the shutter is located opposite the protective shield 27, and in the lower position, the working shutter 1 rests on the stops.

In the prototype, the sealing is created by an elastic refractory material, which is laid around the perimeter of the damper, and in the proposed embodiment, a sealing refractory material is used, which ensures tight contact of the damper with the opening of the furnace and the sealing of the closed opening.

The disadvantages of the prototype are that:

- the design is complex;

- the seal of the furnace 26 does not close the metal structure of the valve 11 and the metal frame of the window of the furnace 23 from the action of hot gases, therefore, the gases in the furnace contact and heat the metal frame of the window 23 of the furnace and the metal frame of the valve 11, causing warping and, as a consequence, leaks between them;

- due to the resulting leaks there will be significant heat loss;

- there is no heat-insulating layer in the damper, so the losses will be greater than if it were;

- low operational reliability due to the large number of springs, seals, shutter flaps.

The objective of the invention is to simplify the design, increase the tightness of the window to be closed, increase operational reliability, reduce heat loss of the furnace.

The technical result is an increase in the reliability of sealing the furnace, reducing heat loss, simplifying the design of the device.

This is achieved by the fact that in the sealing device of the furnace window containing the actuator, the shutter, a protective screen, restrictive stops, according to the invention, a special design shutter is introduced with two welded nozzles moving along the copiers.

The introduction to the design of a special shutter with nozzles that moves smoothly along the copiers makes it simple and ensures reliable tightness.

In addition, the shutter is made in the form of a welded frame, lined inside with refractory fireclay one and a half brick, protruding from the front plane of the frame by 50-60 mm.

The execution of the lining of the protruding part of the lining, which enters the opening of the furnace window and provides tight contact when the window is closed, protects the metal frame of the valve from the direct action of hot furnace gases. The frame does not warp, does not "lead", cracks and leaks are not formed.

A L-shaped “lock” is formed, creating a seal, eliminating the breakthrough of furnace gases to the outside and reducing heat loss.

At the same time, the damper has a double heat-insulating layer of refractory material and a welded back wall.

Such a constructive solution significantly reduces heat loss. The back wall of the shutter and the frame are not very hot.

In this case, the copiers are made of steel with scarves for stiffness, and the entrance part of the copiers has an angle of 35 degrees, as well as an angle of 3 degrees, formed between the vertical plane and the flexible connection in the drive.

According to experimental data, other angles of the entry part of the copiers, other than 35 °, as well as a change in the angle of 3 °, to some other angle lead to negative results in the design.

The implementation of the above elements allows you to smoothly rise and fall shutter, provides simplicity of the entire structure, high operational reliability and good tightness.

In addition, the proposed design of the furnace window sealing device does not contain a single spring, or ball joints, or wings, or seals between the leaves.

The absence of these elements in the device provides simplicity of design and high operational reliability.

Figure 1 (side view) shows the invention, figure 2 - view A.

The present invention consists of a drive 8, a pneumatic cylinder with a flexible connection 16. The valve 11 consists of a welded frame 23, has two welded nozzles. Two nozzles 34 are based on two copiers 33 and with the help of the actuator, the shutter 11 can move up and down, opening and closing the window 13 of the furnace. The damper 11 has a back wall 37, a double heat-insulating layer 36 of refractory material and is lined with a one and a half fireclay brick.

It is important to note that the refractory lining of the shutter 35 protrudes beyond the plane of the welded frame 23 (by 50-60 mm) and, when the window 13 is closed, enters the opening of the furnace, a reliable L-shaped “lock” is formed, which prevents gas from breaking out of the furnace to the outside.

The refractory lining protruding beyond the flap frame 23, in addition to performing the tightness function, also serves to protect the flap frame metal structures from the action of hot furnace gases, which cause it to warp and form gaps and leaks.

The tightness of the shutter 11 of the window 13 of the furnace is ensured by the inlet part of the copier 33, which has an angle of 35 degrees, as well as an angle of 3 degrees, formed between the vertical and the flexible connection 16.

Practice has shown that the above conditions are optimal for smoothly raising and lowering the shutter 11 and sealing the furnace. In the raised position, the shutter 11 is located opposite the protective screen 27.

In the window sill of the furnace, based on channels and jibs 39, there are two stops 38, on which the damper rests, being in the lower (closed) position. Copiers 33 are welded to the I-beam 32 and are securely fixed with scarves 40.

The device for sealing the furnace window as follows.

When you turn on the actuator 8 to move the shutter 11 down, under the influence of its own weight, leaning on the copiers 33 against the nozzles 34, it moves smoothly down and enters the protruding part of the refractory lining 35 into the furnace window 13.

At the end of the stroke, the flap is pressed against the furnace and resting on the stop 38. In this case, the welded frame 23 of the flap 11 is tightly pressed against the lining of the furnace window.

A l-shaped “lock” is formed around the entire perimeter of the contact between the lining of the inlet part of the shutter and the lining of the furnace opening, which provides reliable sealing.

When opening the window 11, the actuator 8 begins to move the valve 11 through a flexible connection 16 up the copiers 33. The protruding lining of the valve 11 smoothly leaves the window 13 of the furnace and in the upper position stands opposite the protective screen 27.

The proposed device for sealing the furnace window has a simple design, allows to achieve reliable sealing, increase operational reliability, reduce heat loss.

Claims (2)

1. A device for sealing a furnace window, comprising a shutter resting on restrictive stops, a device for raising and lowering the shutter in the form of a pneumatic cylinder with a flexible connection and a drive, characterized in that it is equipped with copiers, and the shutter is made in the form of a welded frame with a lining and two welded to it with nozzles designed to ensure smooth movement of the shutter along the copiers, while the lining of the shutter protrudes beyond the plane of the welded frame with the possibility of forming a tight “lock” when the furnace window is closed, but and the back wall of the shutter has a double heat-insulating layer. 2. The device according to claim 1, characterized in that the copiers in the lower lead-in are made with a slope of 35 °.

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