SU448226A1 - Valve for gas and blast furnace air ducts - Google Patents

Description

one

The invention relates to the field of ferrous metallurgy, in particular to the design of valves for gas and air ducts of a blast furnace.

A valve for gas and air ducts of a blast furnace is known, comprising a housing, a locking disc and a cooled ring which is optimized in the housing and which are fastened therein by means of a threaded connection for supplying and discharging the cooling agent through the plugs fixed in the housing.

For such a valve, the characteristic feature is its density at the points of passage of the indicated pipes through the housing, where the gland seals of the pipes are installed. Due to temperature deformations of the rings, displacement nx relative to the valve body, transverse lubrication of the packing gland packing pipes occurs, resulting in gas blows or hot air that are unacceptable according to the normal operation of the valve. Additional tightening of the gland seals can prevent gas or air leaks.

In addition, the transverse forces acting on the pipes cause a violation of the density of their threaded connections to the rings, which leads to the appearance of water leakage in these connections, which cannot be repaired on the operating valve.

The aim of the invention is to increase the tightness by enclosing the upper

the end of each pipe into the bellows compensator, is connected by the 1st one end to the tube, and the other to the connector, and running on the outer surface of the pipe in place of its connection to the ring of two cylindrical

grooves of different sizes, located on both sides of the threaded connection.

On fng. 1 shows the proposed valve, a general view; on fng. 2 is a section along A-A in FIG. one; in fig. 3 shows the node I in FIG. 2; on

FIG. 4 is a section along BB in FIG. 2; in fig. 5 is a view along line C of FIG. 2

The valve consists of the following main elements: the cornea 1, connected to the lid with the bolts of the cover 2, the locking disc 3 with the pipes 4 for nodvod n withdrawal of the cooling agent disk, on the 5th side of the dns installed in the corns of two cooled rings 6, the pipes 7 for inlet and outlet of the agent cooling rings, welded into the housing of the coupling 8 and compensators 9.

Each compensator is made in the form of a cup consisting of a bellows 10 and fittings 11 and 12 with flanges attached to it. By means of these flanges and bolts 13, the COU pensor is tightly fixed on one side of the fitting 8 of the housing 1 and the other tightly attached to the free end of the pipe 7 through an intermediate flange bushing 14, which sits tightly on the thread 7 on the pipe 7.

Possible temperature deformations and displacement of the ring 6 relative to the housing 1, and consequently the movements of the pipes 7, are compensated for by the angular and linear movements of the bellows 10 calculated by the total pressure of the working medium in the valve (gas or air). At the same time, leakage of the working medium in the considered node is completely excluded.

The pipe 7 at the junction with the ring 6 has on the outer surface two smooth cylindrical grooves of different diameters (D and d), and the thread is located between the three / three grooves. Such a design of connecting the pipe to the ring excludes the loading of the threads of the pipe and the ring by transverse forces, which can cause the thread to break and the density of the connection to be damaged.

From the action of the bending moment on the tube 7, a reaction occurs in its embedment in the form of a pair of forces, one of which is applied to the top and the other to the bottom cylindrical

pipe groove. The thread perceives only

forces acting along the pipe axis.

The proposed valve design makes it possible to significantly increase its tightness and, therefore, its durability.

Subject invention

Claims (2)

1. Valve for gas and air pipe blast nechi, comprising a housing, shut-off a disk and a cooled ring mounted in the housing with tubes fixed therein for supplying and discharging the cooling agent passing through the plugs embedded in a housing, characterized in that, in order to increase the tightness, the valve is provided with bellows expansion joints which enclose the upper ends of each of the pipes and are connected at one end to the pipes and the other to connectors. 2. Valve for gas and air ducts of the blast furnace according to claim 1, characterized in that, in order to ensure the density of the connection of the pipes with the ring, cylindrical and points of different diameters are made on the outer surface of the pipes on either side of the thread. Shh I I  P C-J FIG. 2