SU42555A1 - Safety device for gauge glass - Google Patents

Description

The invention relates to safety devices for gauge glasses with automatic self-closing valves installed between the boiler and the gauge glass fittings and acting automatically when the glass gauge tube breaks in order to protect boilers from splashing, steam or hot water, stemming from a broken tube.

In the proposed device for gauge glasses on valves, the free-form curved leaf springs are reinforced with their cylindrical parts by means of screws, the plates of which, when the glass breaks, close the narrowed part of the steam and water passages to the latter.

In FIG. 1 shows a longitudinal section of a safety device for gauge glass; FIG. 2 is the same at the time of breakage of the glass; FIG. 3 is a cross-section along ab in FIG. 2; FIG. 4-view figured leaf spring.

The operation of the device is based on the dynamic action of a jet of steam (or water), which begins to quickly rush out of the boiler when, due to a breakage of glass in the valve, its pressure drops to the atmospheric level. This dynamic action of the jet valve

the device, overcoming the elasticity of its spring, is pressed against its saddle, locking the exit of steam or water).

With the production of glass, the pressure in the valve, due to the incomplete tightness of the valve, gradually rises, the outflow of steam stops and the valve, under the action of its spring, again takes up its normal position.

The fixture can be attached to the boiler either by means of a flange connection or by means of a screw nipple 20 screwed into the wall of the boiler (Figs. 1 and 2). The invention is applicable to all types of boiler installations, both stationary and mobile, where water-measuring glasses are used as indicators of water level.

The use of such devices has the greatest value for mobile boilers, for example, in steam locomotives, steamboats, and excavators, where working conditions of boiler installations are less normal and more difficult and where there is a greater probability of breakdowns of water meter glass during boiler operation.

A flange / 9, fitted with a fitting 20, which is screwed into the wall of the boiler, has a hole 2 in the center, which communicates the space of the boiler with the internal space of the fittings

glass. This hole is somewhat tapered with smooth curves, which aims to enhance the dynamic action of the jet and reduce the loss of its energy. A cup 18 is screwed into the flange 19 with a central, enlarged channel at the end, this expansion being the seat 17 of the spring valve 14. The latter is pressed by a shaped lamella spring 13, which is screwed to the valve 14 with a screw 15 and pressed by the washer 16; This spring, convex in the free position, pushes the valve to the extreme left position, thanks to which the valve 14, fitted with lugs 9, during normal operation of the glass is always kept in the open position, giving free access for steam (or water) to the glass reinforcement. When glass breaks, when the pressure in its reinforcement suddenly drops to atmospheric, the jet from the boiler impacts the valve 14 with force, and to enhance this effect, the surface has a recess 10 and forces it to press against the seat, instantly closing the steam outflow (or water) out through the glass fittings, and the spring 13 takes a concave shape (Fig. 2). The hoses of the spring 13 are located in the corresponding depressions of the saddle 17. The shape of these depressions, as well as the shape of the surface of the valve 14 and the washer 16, is such that it does not constrain the deformations of the spring. The valve seat on the seat, however, is made without the usual tightness and

without lapping. Bjapadad this steam will be a small amount of leak between the valve and the seat, not cause harm to the staff; Because of this, when a new glass is put under pressure. the valve inside the valve will gradually increase with and compare, finally, with the pressure & the boiler, after which the valve spring will press it to the extreme open position (Fig. 1), which corresponds to normal operating conditions. To more reliably provide the necessary leakage of the valve on the extended surface of the seat 77, three grooves 2 / are made, which are narrower for the steam part and wider for the water part. In order to connect the device with the usual water-glass fittings, the beaker 18 has a groove with a thread into which the fitting of the fittings is screwed.

The subject matter of the invention.

Safety device for gauge glass with automatic self-closing valves, characterized by the use of figured lamellar springs 13 (Fig. 1, 2, 4), convex in a free state, fixed on the valves 14: using a screw / 5, the washers 16 of which are intended to close the narrowed steam and water passages to the glass when the latter breaks.

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