RU191315U1 - SUPERSONIC REDUCING THROTTLE - Google Patents

Abstract

The invention relates to devices that provide a constant flow rate of the medium through its cross section in a certain range of the pressure drop formed on the device. The scope of the device is the sphere of production, transportation and processing of gas and oil, as well as other areas of industrial application in which it is necessary to ensure a constant flow of a gaseous or liquid medium with a pressure drop in the range from 4.5 to 15 MPa. The technical task and the positive result of the claimed of the invention is the development of a supersonic nozzle that provides gas reduction and a constant flow of the gas medium through its cross section in the range of pressure drop between the inlet and an output of 4.5 MPa to 15 MPa. The technical result is achieved due to the fact that the supersonic reducing throttle is made of a metal cylinder with an internal stepped groove forming an inlet chamber, a directly reducing nozzle, a flow normalization channel, and an outlet chamber. Outside, the throttle has a thread designed to mount the reducing throttle in the fitting, the instrument body or the equipment wall (sampling device). Stainless steel or brass is used as the metal for the manufacture of the reducing throttle. Step grooving is performed by drilling with drills of various calibers. The groove of the reducing nozzle, depending on the required flow rate through the cross section, is performed from 0.1 mm to 0.5 mm in increments of 0.1 mm.

Description

The invention relates to devices that provide a constant flow rate of the medium through its cross section in a certain range of the pressure drop formed on the device. The scope of the device is the sphere of production, transportation and processing of gas and oil, as well as other areas of industrial application in which it is required to ensure a constant flow of gaseous or liquid medium with a pressure drop in the range from 4.5 to 15 MPa.

The proposed utility model is a device designed for reducing gas or liquid and intended for installation in the internal thread of the fitting or walls of instruments, measuring chambers, reduction devices, sampling devices and other technological equipment.

Today, science knows the following technical solutions, a summary of which is given below:

1. The supersonic Shesterenko nozzle is known [1]. The nozzle is designed to accelerate the gas-dynamic (compressible) flow to supersonic speeds in various fields of technology (for sandblasting, vacuum cleaners, aerosol particle traps, phase separators, etc. household appliances).

A disadvantage of the known solution lies in the impossibility of reducing gas with it and ensuring a constant flow rate through the nozzle, since it is mainly designed to provide ultrahigh flow rates of a compressible medium through the nozzle.

2. Known nozzle of a liquid-gas ejector [2]. The present invention relates to the field of inkjet technology, mainly to liquid-gas ejectors used to create a vacuum in various technological processes. The device is also intended for use in liquid-gas ejectors used for pumping and compressing gaseous, vaporous and vapor-gas media.

A disadvantage of the known solution is the impossibility of reducing and ensuring a constant gas flow through the nozzle.

The technical task and the positive result of the claimed invention is the development of a supersonic nozzle that provides gas reduction and ensures a constant flow of the gas medium through its cross section in the range of pressure difference between the inlet and outlet of 4.5 MPa to 15 MPa.

The technical result is achieved due to the fact that the supersonic reducing throttle (Fig. 1) is made of a metal cylinder with an internal stepped groove forming an inlet chamber (Fig. 1, sn. 1), a directly reducing nozzle (Fig. 1, sn. 2) , a channel for normalizing the flow (Fig. 1, sn. 3), an exhaust chamber (Fig. 1, sn. 4). Outside, the throttle has a thread (Fig. 1, Fig. 5), designed for mounting the reducing throttle in the fitting, the instrument housing or the equipment wall (sampling device).

Stainless steel or brass is used as the metal for the manufacture of the reducing inductor. Step grooving is performed by drilling with drills of various calibers. The groove of the reducing nozzle, depending on the required flow rate through the cross section, is performed from 0.1 mm to 0.5 mm in increments of 0.1 mm.

The principle of operation of a supersonic reducing throttle is as follows:

- a gas medium is supplied to the inlet chamber of the throttle at a pressure of 4.5 to 15 MPa, the exhaust chamber is connected to the atmosphere through a pulse tube, a measuring chamber or other equipment into which it is necessary to supply reduced pressure gas (reduced gas);

- when forming a pressure drop in the range close to the specified, the gas flow passing through the reducing nozzle acquires a constant flow rate due to supersonic outflow;

- gas with a constant flow rate (depending on the size of the groove of the reducing nozzle, it is 1 l / min to 40 l / min for 0.1 mm and 0.5 mm, respectively) comes from the reducing nozzle into the normalizing channel, where the flow partially restores its temperature to the original way of heat exchange with the walls of the channel, and then enters the output chamber, which communicates with the impulse tube or directly with the measuring chamber.

Installation of the reducing throttle is performed by a threaded connection, which, when planted in place, is lubricated with thermal grease.

The main distinguishing features of the claimed invention are:

- the use of stainless steel as the main material, which allows the use of a reducing inductor in aggressive hydrogen sulfide-containing environments, weak acidic and alkaline environments;

- compact design of a reducing inductor, which allows its installation in devices of limited size and components of technological equipment;

- high reliability of the throttle provided by minimizing the elements of the number of elements that may come into a faulty state;

- simple throttle manufacturing technology, which does not include the formation of complex curved surfaces in its structure, the use of welding, cascade nozzle designs.

The described invention is applicable when measuring the parameters of a gaseous medium when it is necessary to reduce the gas into a measuring chamber or other equipment from which the medium is pumped or discharged into the atmosphere.

List of sources:

1. Supersonic nozzle Shesterenko patent RU 2574788 C2.

2. The nozzle of a liquid-gas ejector patent RU 2142073 C1.

Claims (1)

A supersonic reducing throttle, characterized in that it is a device made of metal and having an inlet and outlet chamber, normalizing the channel, characterized in that the internal step groove is made with a cross section from 0.1 mm to 0.5 mm.

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