SU1442776A1 - Apparatus for damping pressure pulsations of liquid flow - Google Patents

Abstract

The invention makes it possible to increase the stability of parameters of a viscous working medium, such as fiber suspensions in paper machines. In the hollow body 1, partially filled with liquid with the formation of a gas cavity, inlet and outlet pipes 2 and 3 are coaxially installed. Pipeline 4 of pressurization is connected to the gas cavity by gas. Throttling device 5 reports TP 3 from the liquid

Description

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part of housing 1. Device 5 is made in the form of perforated plates 6, 7 with coaxial perforations 8, 9, installed with a gap perpendicular to the axis on the end surfaces of TP 2, 3. TP 3 is installed with the possibility of axial movement. The diameter of the perforations 9 is larger than the diameter of the perforations 8. The ring, the partition 10 is installed concentrically with the TP 3. Pipe 11 relief

installed on the outer surface of the housing 1 below the level of the plate 7. The partition 10 is made in the form of a body of rotation, the top of which is higher than the level of the plate 6. If the pressure of the air cushion is lower than the pressure behind the plate 7, then the efficiency of damping of pulsations increases. The degree of pressure decrease of the air cushion is regulated by the nozzle 4. 2 Cp. Of the tube, 2 Il.

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The invention relates to the field of mechanical engineering and can be used for damping pressure pulsations in fluids, for example, fiber suspensions in papermaking machines.

The aim of the invention is to increase the stability of the flow parameters of a viscous working medium.

FIG. 1 shows a device for damping pulsations of the pressure of a fluid flow, a longitudinal section; in fig. 2 - the same, with the installed annular partition.

The device comprises a housing 1, a supply pipe 2 and a discharge pipe 3, a gas nozzle 4, a throttling device 5, perforated plates 6 and 7 with coaxial holes 8 and 9, an annular partition 10, a discharge pipe 11.

The device works as follows.

The liquid enters the supply pipe 2, passes through the holes 9 of the perforated plate 7 and enters the holes 8 of the plate 6, and each separate stream coming out of the hole 9 falls into the corresponding hole 9 of the plate 6, this is facilitated by the installation of the supply pipes 2 and 3 on the same vertical axis passing through the middle of the body. Thus, the entire flow coming from one pipeline is directed to the other. After plate 6, the fluid enters the pipeline 3.

Since the plates are installed with a gap H, part of the liquid falls inside the housing 1, where a constant level of mass is maintained by the automation system. In the case of an annular partition 10, a small amount of the mass with foam and soils flows through it and is removed through the discharge nozzle 11.

The damping of pressure pulsations in the flow is carried out by throttling the flow of fluid through the perforated plates 6 and 7, as well as by absorbing the energy of the pulsation by an air cushion associated with the flow through the gap H between the plates 6 and 7.

The jets emerging from the openings 9 fall into the gap between the plates and, as they move forward, they additionally entrain adjacent fixed fluid layers, due to which the jet is thickened.

The gap H between the perforated plates 6 and 7 is selected from the condition so that the expansion jet with the passage of the holes 8 of the plate 6 fills the cross section. 0 The ratio of the diameters of the perforations and the gap H is hereby expressed by the relation (d2-di), where di and d2 are the diameters of the perforation holes.

If the pressure of the air cushion becomes lower than the pressure in the flow beyond 5 by plate 7 in the outlet pipe 3, where the liquid is pushed through the gap H between plates 6 and 7, the efficiency of damping pulsations increases.

The degree of pressure reduction of the air Q cushion is adjusted using the pipe 4.

Claims (3)

Claim 1. Device for damping pulsations of fluid flow pressure, containing a hollow body, partially filled with liquid, with the formation of a gas cavity, supply and discharge pipelines, vertically coaxially installed in the body, a branch pipe of gas inflation, communicated with a gas cavity, and a throttling device for communicating the pipeline with the liquid part of the housing, characterized in that, in order to increase the stability of the flow parameters of the viscous working medium, the throttling device is designed as a performer coated plates with coaxial perforations. five installed with a gap perpendicular to the axes on the end surfaces of the pipelines, the outlet pipeline is mounted for axial displacement, and the diameter of the perforations of the plate of the outlet pipeline is larger than the supply pipe. 2. The device according to claim 1, characterized in that, in order to remove excess level viscous working fluid, the damper is equipped with an annular partition, installed concentrically with the discharge pipe in the liquid part of the housing, and with a discharge nozzle, while the discharge nozzle is installed on the outer surface of the housing below the perforated plate of the feed pipe whose top is above the level of the perforated plate of the discharge pipe. Carriage Of air. 3. A device according to claim 1 and 2, characterized in that the gap between the perforated plates is (d2-d,) when 2d | : d2; 3di, where H is the size of the gap; di is the diameter of perforation holes of the inlet pipeline plate; d2 is the diameter of the perforation holes of the discharge pipe plate.