SU1751280A1 - Arrangement for protecting pipelines against freezing - Google Patents

Abstract

SUMMARY OF THE INVENTION: An annular piston A and a drain nipple 7 are arranged in a housing 2 with openings 3. 2 is made with a cover 9 and a valve 10 rigidly fixed thereto. The piston 4 is placed below the openings 3 and is connected to the nozzle 7. The elastic element 13 is made of an anti-friction material. 1 hp f-ly, 2 ill.

Description

The invention relates to water supply and drainage and can be used to prevent pipelines laid on surfaces from freezing.

Devices are known for discharging water from pipelines in the event of a threat of freezing. The disadvantage of these devices is their low reliability due to the possibility of water freezing in the drain channel.

The closest to the invention to the technical essence is a device 2, which is a body with holes attached to the wall of a water pipe, an annular piston and a drain pipe arranged therein, and a valve for closing the drain pipe, the drain pipe being attached to the pipe wall and the body , and the annular piston has the ability to move along the drain pipe together with a valve attached to it.

A disadvantage of the device is that when water flows through the drain pipe there may be an ice plug that will prevent water from draining during the subsequent operation of the device.

The purpose of the invention is to increase reliability and enhance functionality by providing protection against overpressure as well.

The goal is achieved by the fact that in a device comprising a housing with openings, an annular piston and a drain pipe located thereon and a valve for closing the drain pipe, the drain pipe is provided with an elastic element connected to it in the upper part and in the lower part brought out of the pipeline. , - with the case, which is made with a lid and rigidly fastened; a valve fixed on it, and the piston is placed below the holes of the housing and is connected to a drain pipe, while

Yu

00

about

The plastic element is made of antifriction material.

Fig. 1 shows the device in the closed state during normal operation of the pipeline; in fig. 2 - the same, with the open drain pipe.

The device for protecting the pipeline 1 from freezing and overpressure consists of a housing 2 with openings 3. Inside the housing 2 there is an annular piston 4, which, for example, is pressed against the stops 6 by a spring 5. The upper end is attached to the annular piston 4 by the lower end the end of which passes through the opening 8 in the lid 9 of the housing 2 and presses against the valve 10 with a sealing element 11 fixed to the lid 9 of the housing 2 by means of the pillars 12. An elastic element 13 made of antifriction element 13 is inserted inside the drain nipple 7 material with low adhesion with ice (for example, Teflon), with its upper part attached to the drain nipple 7 by a bolt 14, and the lower part is brought outside the pipeline 1 and fixed to the outside of the housing 2 by a nut 15.

The operation of the device is as follows.

When water moves through the pipeline, it is circulated in the annular cavity inside the housing 2 above the annular piston 4, where water enters through the holes 3. When an ice crust thicker than the hole 3 is formed on the walls of the pipe 1, the water circulation in the housing 2 stops and the water in the annular cavity intensively freezes. At the same time, its volume increases, as a result of which the annular piston 4 moves downward, overcoming the force of the spring 5. As the annular piston 4 moves, the drain branch pipe 7 attached to it also goes down, its upper end moves away from the valve 10 and water flows out into the gap formed 1. preventing it from freezing and breaking down. When the slip nozzle 7 and the annular piston 4 move, the elastic element 13 deforms and ice or ice on the cork, which formed when the outflowing water freezes during the previous operation, cleaves and falls out of the fluid drain channel.

After the water is re-started through the pipeline 1, the ice on the walls of the pipeline 1 and then inside the housing 2 thaws as the incoming water has a temperature higher than

0 ° C. In this case, the spring 5 returns the annular piston 4 to the initial position, the drain connection 7 with its upper end abuts the valve 10 and the gap through which water flows out closes.

At the subsequent stop of the movement of water in pipeline 1 and the threat of a pipeline rupture due to the freezing of water in it, the operation is repeated.

The device also protects the pipeline against overpressure. Spring 5 is chosen so that its compressive force is greater than the water pressure in the pipeline, but less

maximum allowable for it. When a large excess pressure of water occurs, it is transmitted to the interior of the housing through the holes 3, the annular piston 4 descends, overcoming the force of the spring 5, and through the drain pipe part of the water flows out. The device acts as a safety valve, preventing the pipeline from rupture if an overpressure occurs, for example, with a water hammer.

Claims (2)

1. A device for protecting the pipeline from freezing, comprising a housing with openings, an annular piston and a drain pipe disposed therein and a valve for closing the drain pipe, characterized in that, in order to increase reliability and enhanced functionality by providing protection against overpressure as well, the discharge nozzle is provided with an elastic element connected to it at the top, and the bottom, out of the pipeline - with the case, which is made with a lid and a valve rigidly fixed on it, and the piston is placed below the holes of the case and connected to the drain pipe. 2. The device according to claim 1, characterized in that the elastic element is made of an antifriction material. i DA 1 15