SU857090A1 - Throttle device (its versions) - Google Patents

Description

one

The invention relates to hydraulic control equipment devices and may find application in mechanical engineering.

A throttle device, designed as a valve, is designed to regulate flows, mainly gases, including the saddle and a bowl attached to the valve stem.

A distinctive feature of this device is the presence in the saddle of equidistant on the entire surface of the diffuser channels, the extension 1X with an expansion ratio of 3.55, 0 and an opening angle of 5-8.

The drawback of the device is the inadequate performance of the valve inlet channel, which causes uneven distribution of flow parameters over the cross section.

Constructive implementation of the bowl with the translational motion in the regulation of flow requires the application

considerable effort, especially when operating the valve in high-speed fluid flows with high flow.

It is also known a device with a more optimal performance of the channels of the adjustable valve, which allows to achieve a uniform distribution of flow parameters over the cross section and consisting of two perforated panels, whose perforations are offset relative to each other in the fixed and moving panels, and flow control is carried out by axial The moving panel 2.

The Nbdz1 residual of this device is that when adjusting the flow, too much movement force is required. This circumstance makes it difficult to use this device in high-speed liquid flows, especially in automatic control systems. In terms of strength, this device is imperfect, and making the drive of the movable panel in the pipeline system complicates the design. The closest to the technical essence of this invention is a throttle device, the working body of which is adjacent to one another coaxially mounted fixed and pivoting elements. With openings for the passage of fluid, for example, the elements are made in the form of stationary and pivoting disks with cuts and jumpers. representing the form of parts of sectors. When the slits are aligned, the throttle device has a maximum passage area, which, until fully closed, is reduced by overlapping the slits of the fixed disk with a swivel disk. The side walls of the slots form in this case the supply and discharge channels, most often confused and diffuse geometry, respectively, C3.

A disadvantage of this device is that during its operation a flow rate pulsation occurs at large degrees of flow throttling. This flow rate pulsation creates a destabilization of the moment from the flow side to the rotary element, which ultimately determines the operation of the regulating mechanism in an oscillatory mode.

The purpose of the invention is to improve the dynamic characteristics of the throttle device.

This goal is achieved by the fact that in a throttle device containing stationary and rotary regulating elements with openings in the form of sectors, the side walls of which form inlet confusing and diverting channels, the rotary regulating element is made variable in the radial the direction of thickness, the opening angle of the diverting diffuser channels is complete within, and the thickness of the rotary-regulating element in the location of the diverting diffuser channels is defined Lena ratio

,

Where Y is the distance from the axis of the rotary control element: H is the pie angle of the hole, in radians;

A is a constant for each concrete construction, the choice of condition A 5.

Another variant of the throttle device provides for the discharge of diffuser channels within 34-90, and the coefficient A is chosen from the conditions.

The restrictions on A from above at the opening angles of the diffuser channels 8-15 and below at the corners 34-90 are chosen based on structural or strength considerations.

FIG. 1 shows schematically a device installed in a pipeline, a general view: in FIG. 2 is a view A ira of FIG. fig.Z - conical version of the device; Fig. 4 shows the normal cross sections of the drossection channels in the fully open (a) and partially blocked b states; in Fig. 3, section B-B in Fig. 2j in Fig. 6, section B-B in Fig. 2; Fig. 7 shows flow patterns passing through the channels for various cases of the ratio of the sizes of the output and input channels, the throttle device.

The throttle device contains adjacent one fixed element (disk) I and tilt-adjusting element (.disc) 2 with equally spaced slit slots on each disk in the form of parts of sectors. The side walls of the slots form the supply confusing channels 4 (Fig. 4) in the disk 1 and the diverting diffuse channels 5 (Fig. 4) in the disk 2,

Installed throttle device in the pipeline 3. Sealing units and the drive of the rotary disk is not shown.

 2 is made of variable thickness in the radial direction. At the same time, at the location of the discharge channels 5, this thickness is determined in accordance with the ratio

e -,.

where V is the current radius of the disk2:

vp slit angle in the plan (figure 2):

And the coefficient constant for a given construction, its value depends on the chosen node of opening of the outlet channels (Fig.4o |).

Claims (3)

When throttling the fluid flow by rotating the disk 1 at a certain angle, the passage width in the channels um1MP) 1 1A1-mt i: large,) - 8 ((l) nr.)) For a fully open throttle to large O. The magnitude of the flow rate is determined by the coefficient of resistance of D1 – NN throttles, which depends on the degree of closure of the throttles J - & o (/ o | and the ratio of the Ejcil values and the angle of opening of the discharge channel cL its passage through the local narrowing ci. As studies have shown, at E / s values (3 and opening angles of channels 0 34-90 °, the flow emerges from the throttles in the form of jets at a certain angle 0 to the disk surface, as shown in figure 5, where is shown the cross-section of the channel channels Drossel made over a certain radius hf. Only at some distance are the separate jets merged into the flow (the boundary lines of the flow in Figures 5.6 and 7 are shown in dotted lines.) At values of E | a / 5 and angles of 8-15 jets, the passage through constrictions of the SJ, then have time to occupy all the sections of the outlet channel (Fig. 6). They come out of the throttles normally to its forming surface. At 1 / a 4 and d. 15-34, unstable currents are observed, expressed in an arbitrary change in jet character either according to the type of FIG. 5, or according to the type of FIG. 6. For slots made in the form of parts of sectors, the value of Jf will be constant along the radius H, therefore, its effect on the drag coefficient is independent of the radius. The ratio / 01 depends on the law of variation of the disk thickness in the radial direction. So when adjusting throttles in the case of constant thickness of a disk with outlet channels, there comes a time when for large current V we have B / a 3, and for small 6 | O1 5. For example, Figures 5 and 6 show sections of the outgoing channels performed on different radii of the disk - means that somewhere in the intermediate sections there is a relationship, as a result, an unstable flow zone is formed with a varying drag coefficient and the exit angle of the jets in from the thrusts. These two circumstances cause fluctuations in the flow rate and instability of the moment from the forces of jet flow on the elements of the throttles. It is possible to avoid this phenomenon if the thickness of the disk with outlet channels is varied according to the s: which ensures the constancy of the P / O. This constancy will be satisfied if the thickness of the Dasca at the site of the outlet channels is determined by the C A – H – H ratio. And the angles of opening of the channels, taken in the ranges of 8-15 ° at 34-900, and 3 and 3, create unambiguous conditions for the formation of a jet stream in the discharge channels (Fig. 7a) for the first case and (Fig. .7 b) for the second. Experiments conducted with a droplet device made according to this invention showed a significant decrease in fluctuations in fluid flow and an increase in the stability of the magnitude of the control torque, which indicates an improvement in the dynamic characteristics of this device compared to the known one. Claim 1, a throttle device comprising movable and rotary-regulating elements installed in a housing with openings in the form of parts of sectors, the side walls of which form supply confusing and discharge diffuser channels, characterized in that in it the rotary-regulating element is made variable in the radial direction of thickness, the opening angle LEADING 1F1X diffuser channels is made within 8-15, moreover, the thickness of the rotary-regulating element in the area of the outlet diffuser channels is determined by the ratio e-A-vp h, de h is the distance from the axis of the rotation-adjusting element J H - the angle angle of the hole in radians; A is a constant for each particular design and is chosen from the condition VIA A / 5. 2. Throttle device, containing elements installed in the housing and rotary re1-uluration, with openings in the form of portions of sectors, the side walls of which form the confinement and discharge diffuser channels, in order to improve the dynamic characteristics of the device , in it there is a rotation-regulating element in the wave variable in the radial direction of thickness, the opening angle of the diverting diffuser channels is made within 34-90, moreover, the thickness of the rotary regulator element in the section the position of the outlet diffuser channels defined by the ratio of 15 E - A-HN flow direction 857090 pr № № t Ft. 2 h is the distance from the axis of the rotary control element; H is the pie angle of the hole in radians. A is a constant for each particular design, the coefficient chosen from the condition. Information sources. ntye into account during the examination 1. The author's certificate of the USSR 36460, cl. F16 K 1/06, 1970. 2. The USSR author's certificate 33801, cl. F16 K 1/22, 1976. 3. The author's certificate of the USSR 87338, cl. G 05 D 7/01, 1969 (proip). Flow direction (Direction of flow Flow direction five Direction flow FiL