SU1211230A1 - Jet feeder - Google Patents

Description

2. The feeder according to claim 1, characterized in that 4TOj for the purpose of improving the thermal homogeneity of the mineral melt supplied

The invention relates to the production of fiber from inorganic melts and relates to a jet feeder for producing a jet of melt and feeding it to a device for processing the melt into a fiber.

The aim of the invention is to increase the service life of the jetting device. FIG. 1 shows a jet feeder, general view; in fig. 2 - node I in FIG. 1.

The jet feed unit is made in the form of a direct electrically heated tube 1 with conical current leads 2 and 3, which communicate with the feeder 4 of the melting furnace and with a filter feeder 5.

In the jet feeder, the tube is made straight, which allows an increase in the hydrostatic pressure and, accordingly, the melt flow rate due to a decrease in pressure losses from local resistances.

In order to improve the thermal homogeneity of the inorganic melts fed to the spinneret feeder, the cross sectional area of the tube of the proposed jet feeder is 35-40% of the total cross sectional area of the spinnerets.

If the pipeline does not provide for compensation of temperature deformations, then when heated, dangerous voltages occur in its wall.

The magnitude of these stresses is determined by Hooke’s law.

 L, where E is the modulus of elasticity of the first

type, kgf / mm; i - relative compression or

elongation, determined by the ratio of elongation (or compression) of the D1 pipeline to its

length 1

 .

In the spin-die feeder, the cross-sectional area of the tube is 35-40% of the total cross-sectional area of the nozzles.

For a platinum-rhodium jet feeder having a length of, for example, 575 mm, the elongation at is L1 1400 ° x01 1400 ° x8, 9x10 m / deg 0, 072, 2 mm.

where o (- coefficient of thermal

extensions (for platinum about (8.9 x 10 and / deg)., 2 mm /

/ 575 mm 0.012.

The modulus of elasticity for platinum., From which the jet feeder is mainly made (ILn.f97%), is E 15000 kgf / mm, therefore 6 15000 cps / mm xO, kgf / mm, which greatly exceeds the allowable tensile strength for platinum.

In the proposed design of the current connection, in which compensating omega-shaped sections are provided at the points of connection of the current leads to the supply tube, with the pre-stretching of such an omgodal compensating section by half of the expected thermal extension, the IN tubes compensate for it.

L. S 4fe -

v 6 — flexural stress, kg / cm; R is the radius of curvature of the knee, cm; d — tube diameter, cm; m is the stress correction factor for bent pipes.

 2, 1 5-6h2

K - coefficient of stiffness reduction of bent pipes.

1 TB-12

h - pipe coefficient

TO

s

 55S is the wall thickness of the pipe, see 45 For the above example of the jetting feeder with a tube diameter of 15 mm and a wall thickness of 1 mm

. . 0.1x225. h 4x-Arrp- 0.4,

225

K -Y2x0 16

10-12x0.76

t

2 15-6x0,16.

....-.-. and --V - «- 1 S

1x0.25 t 18

26x225

A | 0 o

   ° T5000xT5xT757x0725 11.3 mm.

Thus, the compensating ability of an omego-shaped compensating section with a radius of curvature

7

FIG. 2

112304

R, equal to the diameter of the tube of the jet feeder d () for the given example, 3 mm, which makes it possible to compensate for the thermal elongation of the tube of the feeder at 1400 s D1 7.2 mm.

The indicated dependence () is valid and long. other jet feeders with different tube diameters. 10 The standard service life of known jet feeders is no more than three months. The use of the invention makes it possible to increase the service life of the jet feeder by a factor of 2.

VNII1Sh

Circulation 458

Order 604/28 Subscription

Fipial PPP Patent, Uzhgorod, Proektna St., 4

Claims (2)

1. JET FEEDER for feeding mineral melts from the feeder of the smelting furnace to a die feeder containing a platinum rhodium tube with two cone-shaped ^ '' current leads, characterized in that, in order to increase the service life of the jet feeder, the tube is made straight and the current leads at the junction points tube - omega-shaped with a radius of curvature equal to the diameter of the tube. fi? 1 2. Feeder by π. 1, characterized in that, in order to improve the thermal uniformity of the mineral melt supplied to the spinneret feeder, the cross-sectional area of the tube is 35-40% of the total cross-sectional area of the spinnerets.