CS216412B1 - Throttle valve for automatic fluid flow control - Google Patents

Abstract

Throttle valve with fluid flow control. The invention relates to fluid control devices. The purpose of the invention is a simple solution for regulating the fluid flow, also with regard to changes in fluid viscosity. The essence of the invention is a thin, flexible folded plate placed in the space between the inlet and outlet channels of the valve. The plate covers the outlet channel of the valve in such a way that the folding of the plate creates a gap at the mouth of the channel. By changing the amount of medium flowing through it and thus the pressure and dynamic forces in the inlet channel, the size of the folding of the plate also changes and thus the throttle gap through which the medium flows into the outlet channel. If the plate material is composed of plates with different thermal expansion, the throttle gap also changes depending on the temperature of the medium. By changing the throttle, the valve prevents a permanent change in the flow rate. The plate is designed as a rotary flap. The invention can be used in the regulation and automation of fluid circuits.

Description

BACKGROUND OF THE INVENTION The present invention relates to a throttle valve with automatic fluid flow control which largely eliminates the effects of changes in viscosity and pressure drop across the circuit.

Known fluid flow control valve designs which are based essentially on the principle of combining the throttle and pressure control functions are complex, labor intensive and do not take into account changes in fluid viscosity in the circuit. The prior art valves, which take into account the change in the viscosity of the fluid when controlling the fluid flow, are controlled indirectly, for example, by bimetals. The bimetal acts through a member, for example, a rod, onto a ball valve or a throttle valve and the like.

The above drawbacks and drawbacks are eliminated by the throttle valve for automatic fluid flow control according to the invention, which is based on a thin flexible plate located in the space between the inlet and outlet duct of one or more kinds of materials with thermal expansion extending over the orifice -. Through the gap created by the deflection of a thin resilient thatch, the fluid may flow into the valve outlet. By varying the pressure in the inlet channel of the valve, the deflection of the thin resilient thatch and hence the gap and throttling through which the fluid flows. Similarly, the gap changes when the temperature of the flowing fluid changes. If the thin elastic thatched material is composed of sheets of different thermal expansion, the gap changes as the temperature of the flowing fluid changes. Valve throttling changes ensure self-regulation of fluid flow and thereby control of working movements of fluid mechanisms.

By virtue of the fact that the throttle valve for automatic fluid flow control is formed essentially by only a thin, folded plate embedded in the valve body between the inlet channel and the outlet from the valve, exceptional simplicity, low cost and small valve size are achieved. The valve does not contain any precision fit parts, which greatly reduces manufacturing effort and increases service life and reliability of the valve. '

In the accompanying three drawings, FIG. 1 and 2 show the principle of a throttle valve for automatically controlling the fluid flow according to the invention; FIG. 3 and 4 is an example of valve construction, and FIG. 5 is an example of using a valve in a hydraulic circuit.

In FIG. 1 shows a throttle valve for automatic fluid flow control according to the invention that regulates the flow in the direction of the arrows. The fluid flowing in the direction of the arrow 1 in the inlet duct 2 enters the valve cavity 3 in which the thin flexible plate 5 is located covering the planar seat of the outlet duct 7. At steady state the fluid flow through the valve will be constant. By varying the pressure drop between the channels 2 and 7, the sag deflection and hence the flow gap 6 under the flexible plate 5 will be changed, resulting in fluid flow control. Similarly, the flow gap 6 will also change when the temperature t changes. j. the viscosity of the flowing fluid when the thin flexible plate 5 is formed by a sub-plate having a thermal expansion. The thin spring plate 5 is constructed as a flap pressed against the opening by a spring 4 and is rotatable about a pin 9. In FIG. 2 shows a valve with fluid flow in the direction of arrows 10 and 11. An example of a construction of a throttle valve is shown in FIG. 3 in section B-B. A seal 12 is provided between the upper and lower valve bodies. 4 is a plan view of the throttle valve A-A. In FIG. 5 is an example of a throttle valve arrangement for automatically controlling fluid flow, where the flow resistance and check valve 15 are differentiated between inlet channel 2 and outlet channel.

7. A variable force F is applied to the piston rod 13 of the hydraulic motor 14, which varies, for example, according to the size of the load on the boom hook 17. The derivative engagement of the flow resistance and the non-return valve 15 ensures uniform load lowering.

Claims (3)

1. A flow control valve for automatic fluid flow control, comprising an inlet channel and an outlet channel, characterized in that it comprises a flexible plate (5) folded into a cylindrical shape in a valve cavity (3) between the inlet channel (2) and the outlet channel (7). A flexible plate (5) overlaps the planar seat of the outlet channel (7) so as to form a variable flow gap (6). 2. A throttle valve according to claim 1, characterized in that the flexible plate (5) is formed by joining layers of different thermal expansion. 3. The throttle valve according to claim 1, characterized in that the spring plate (5) is mounted rotatably around the pin (9) at the edge of the plane seat.