DE2623080A1 - THROTTLE WITH DIVIDED FLOW - Google Patents

Description

Bayer AG
5090 Leverkusen

Erdölchemie GmbH
5OOO Cologne 71

Guide control armatures KG
6700 Ludwigshafen-Oggersheim

2 May 1, 1976

Kr / bc throttle section with split flow

The invention relates to a throttle section with split flow according to patent application P 24 48 295.9, wherein the fluid from the inside to the outside through boundary walls arranged at a distance from one another and in layers is passed through.

In chemical processes, more and more throttle valves are used today to regulate process variables. In particular in the case of large volume flows and high pressure conditions, flow noises occur when relaxing, which lead to an undesirably high noise level.

Le A 17 250 / EC 85

703849/0189

It is known that unsteady currents generate noise which is reduced by reducing the speed can be.

A disadvantage of this measure is that large sizes are required, with a high pressure drop and large Throughput can hardly be achieved.

Therefore, the principle of beam splitting is often used today. Resistors are used which split the beam in parallel or in series. As a result, the vortex sizes and thus the Sound sources reduced in size. At the same time, the maximum of the frequency spectrum is shifted to higher frequencies, some of which are no longer audible to the human ear or at least faster than lower frequencies Sound will be attenuated by the environment.

The known constructions only dissipate the energy generated during throttling over a long path, the can only be optimally designed for a certain throttling. In addition, these fittings are often complicated constructed so that maintenance is difficult.

The invention is based on the object of finding a simple, operationally reliable throttle section that can be operated at low Sound power enables high throttling with a throttle characteristic that may have to be specified.

Le A 17 250 / EC 85 - 2 -

709849/0189

This object is achieved in that the Fluid through recesses in a wall at a certain angle, preferably 90 ° pierced hollow body flows.

certain angle, preferably 90 °, the boundary walls

It is surprising that a high reduction in the sound power is also possible by virtue of the pressure reduction essentially takes place through the hollow body and the influence of the free jet through the subsequent boundary walls. Furthermore, the design is facilitated and the favorable area of application is enlarged. It has also proven useful to take the free jet below to hit the boundary walls at an angle. Particularly good results were achieved with one Inclination of the cavity axis to the boundary walls of 5-15 ° achieved. It has also been shown that with increasing length of the recesses in flow directions the free jet is shortened, which facilitates the reduction of this disturbance variable. At the same time, a bevel can then be made be attached, with the possibly existing eddy burr is removed. Also is the construction easy to assemble and therefore easy to maintain.

In a particular implementation of the method, the inflow is in a cylindrically shaped hollow body regulated by a piston.

Le A 17 250 / EC 85 - 3 -

709849/0189

The piston can be used to regulate the flow rate to the throttle. At the same time, the piston can be at the lower end be designed as a valve cone, which when placed on the valve seat provided at the inflow point the The throttle valve closes tightly.

In a further implementation, the inflow changes along the recesses of different sizes the hollow body axis.

Due to the size of the recesses, a specific throttle characteristic can be generated when the piston is moved.

In another passage the fluid flows through Boundary walls whose distance from one another is less than that existing in the direction of the hollow body axis The material jet thickness is and its drainage cross-section in relation to the sum of the recess cross-sections is bigger.

Due to the small distance between the boundary walls, the jet of material is caused by friction and possible division of the Vortex fields strongly calmed. Furthermore, the possibility of radial expansion to the outside reduces the build-up new prints and thus sound sources.

In a common implementation, the flow flows between the annular boundary walls evenly on all sides.

Le A 17 250 / EC 85 - 4 -

709849/0189

This simple construction enables an almost optimal distribution according to the volume increase, see above that the pressure build-up and thus the generation of sound is largely avoided.

An embodiment of the invention is shown in the drawing and is described in more detail below.

The figure shows a section through a throttle fitting.

In a valve housing 1, a valve seat 3 is arranged after the inflow area 2, which the piston 4 with Valve cone 5 can close via spindle 6 by drive 7. The piston 4 moves in a recess 8 provided cylindrical hollow body 9, which in turn is surrounded by the arcuate boundary walls 10 which open into the drainage area 11.

Le A 17 250 / EC 85 " ⁵ "

709849/0189

Claims (5)

Claims 1 )} Throttle section with split flow according to patent application P 24 48 295.9, wherein the fluid is passed through boundary walls arranged in layers at a distance from the inside to the outside, characterized in that the fluid is passed through recesses in a wall at a certain angle, preferably 90 °, the]
butt hollow body flows. Angle, preferably 90 °, through the boundary walls 2) throttle point according to claim 1, characterized in that the inflow in a cylindrically shaped hollow body is regulated by a piston. 3) throttle point according to claim 1-2, characterized in that the inflow changes through recesses of different sizes _% along the axis of the hollow body. 4) throttle section according to claims 1-3, characterized in that the fluid flows through boundary walls, whose distance to each other is less than that. is the material jet thickness present in the direction of the hollow body axis and whose discharge cross-section is larger in relation to the sum of the recess cross-sections. 5) throttle section according to claims 1-4, characterized in that the flow between the annular boundary walls flows evenly on all sides, Le A 17 250 / EC 85 7098 U 9/0189