SU922390A1 - Actuator valve - Google Patents

Description

(54) CONTROL VALVE

The invention relates to power plant construction, in particular, to designs of control valves of a turbomachine, and can be used in any technical field in controlling the flow rate of a working fluid.

Known control valve containing the locking element in the form of a bowl, interacting with the saddle 1.

A disadvantage of the known device is the presence of circumferential pressure unevenness over the surface of the bowl, which causes the valve to vibrate.

Closest to the proposed technical entity is a control valve containing a diverging diffuser channel and a locking element in the form of a hollow bowl, on the surface of which, below the bore diameter, are rows of holes, the centers of which lie in the planes perpendicular to the axis of the valve 2.,

The disadvantage of this design is that the holes on the surface of the bowl communicate with the total volume of the hollow bowl, which causes an increase in the aerodynamic drag or separation of the main flow from the valve bowl, which sharply reduces the effective flow area of the valve.

The purpose of the invention is to improve the vibration and flow characteristics of the valve.

This goal is achieved in that in a control valve. Containing a diverging diffuser channel and a locking element in the form of a hollow thicket, on the surface of which a number of holes are made below the bore diameter, the centers of which lie in planes perpendicular to the valve axis, a partition with annular cuts is installed in the cavity of the bowl, separating it into isolated closed annular chambers, each of which is connected to one row of holes, with an axial hole in the partition that connects the annular chamber located directly behind the bore diameter with the entrance echeniem discharging the diffuser channel.

The drawing shows a control valve, a general view in section.

Claims (2)

The control valve includes a diverging diffusion channel 1, a locking element in the form of a hollow thicket 2, on the surface of which, below the diameter 3 fitting, there are rows of holes 4, the centers of which lie in planes perpendicular to the valve axis. In the cavity of the bowl 2, a partition 5 with annular notches 6 is installed, dividing the cavity of the bowl 2 into isolated closed annular chambers 7, each of which communicates with one of a number of holes 4. In the partition 5 an axial hole 8 is made, which connects the annular chamber 9 located directly for a bore diameter of 3, with an inlet section 10 of the outlet diffuser channel 1. The operation of the control valve is carried out as follows. When the valve is opened between the thicket 2 and the diffuser channel 1, a flow section is formed through which the working medium passes. Since radial structures cannot achieve complete circumferential symmetry of flow parameters, pressure valve 2 is affected by circumferential pressure unevenness, which is the reason for the occurrence of unsteady, unbalanced force applied more often to 2 and causing the valve to vibrate. To reduce the resulting uneven distribution of parameters, chambers 7 and 9 are made, each of which is connected in the circumferential direction with the surface of the bowl by a series of holes 4, the centers of which lie in the same plane perpendicular to the valve axis. Chambers 7 and 9 have a closed annular shape that aligns the circumferential pressure unevenness over the surface of the thicket. The impenetrable walls between chambers 7 prevent the working medium inside the thicket 2 from flowing from the chamber to the chamber and then through the openings 4 To the main flow. This eliminates the possibility of separation on the surface of the bowl 2 because a portion of the working medium is blown perpendicular to the direction of the main flow under the action of a longitudinal pressure gradient. As the valve bowl 2 rises, the chamber 9, located immediately behind the bore diameter 3, appears in the zone of increased pressure in comparison with the lower part of the surface of the valve bowl 2. Under the action of the resulting longitudinal pressure drop, the working fluid flows through the holes 4, chamber 9, then through hole 8, directed to the inlet section 10 of the outlet diffuser channel 1. This increases efficiency, improves flow characteristics of the control valve, as part of the working fluid passing through the valve thicket is blown in the direction of the main flow; reduced -banged portion of the inlet section of the outlet diffuser channel; the unevenness of the velocity profile in the inlet section of the diffuser duct is reduced, which increases the efficiency of pressure recovery in the diffuser. The number of chambers made according to the type of chamber 9, i.e., associated with the lower part of the valve cage, is determined by profiling the inlet section of the outlet diffuser duct and bypass valve thickets, as well as the main operating mode of the valve. If the valve is primarily intended to operate in full open modes, then the number of chambers can also be increased to two or three chambers. Claims of the invention: A control valve comprising a diverging channel and a locking element in the form of a hollow thicket, on the surface of which a row of holes are made below the bore diameter, the centers of which lie in planes perpendicular to the valve axis, in order to improve the vibration and flow characteristics of the valve; a partition with annular cuts is installed in the cavity of the bowl, dividing it into isolated closed annular chambers, each of which is connected to one of a number of holes, and in odke an axial hole communicating the annular chamber located directly behind the bore diameter, with the inlet section of the diffuser duct discharging. Information sources; taken into account during the examination 1. USSR author's certificate No. 336460, cl. F 16 K 1/06, 1970. 2. USSR author's certificate number 399671, cl. F 16 K 1/34, 1971 (prototype).