Fluid handling – Larner-johnson type valves; i.e. – telescoping internal valve... – Line condition change responsive
Reexamination Certificate
1999-09-24
2001-05-15
Michalsky, Gerald A. (Department: 3753)
Fluid handling
Larner-johnson type valves; i.e., telescoping internal valve...
Line condition change responsive
C137S501000
Reexamination Certificate
active
06230734
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to automatic equipment and, more specifically, to flow-rate controllers mounted in hydraulic systems of power plants, for instance, in regulator systems of liquid-propellant rocket engines.
BACKGROUND OF THE INVENTION
Known in the art is a flow-rate controller (U.S. Pat. No. 3,130,747, Cl. 137-504, 1964) comprising a spring-loaded slide valve communicating with the inlet space of the unit from one side, and with the internal space of the controller through openings in the slide valve from the other side. This controller assumed to be similar to the present invention is deficient in that it is designed for operation under constant flow rate conditions and cannot assure the manifold operation in different modes.
Prior art also includes a liquid flow-rate controller which is made in the form of a casing with the main inlet and outlet branch pipes and comprises: a stationary front guide bush with front orifices and with a lateral partition limiting the internal space of said bush to form an inlet space communicating directly with the main branch pipe; a sleeve arranged coaxially in said front guide bush and caused by a mechanically connected actuator to slide therein with a possibility of covering the front orifices; a stationary rear guide bush located in line with the front guide bush and having outlet orifices in its walls; a piston-type slide valve with skirt arranged between said lateral partition and said rear guide bush to form a piston space limited by said lateral partition, the piston being spring-loaded on the side of the rear guide bush and capable of making contact with said lateral partition; a passage space formed between the casing and said front and rear guide bushes whereby the inlet space communicates with the outlet branch pipe via the front and outlet orifices. The holes provided in the aforesaid piston skirt enable the skirt cavity to communicate with the passage space, and the rear portion of the skirt which is a free fit on the rear guide bush can cover the latter's outlet orifices (“Cosmonautics” Encyclopedia, Sovetskaya encyclopedia, 1985, p. 16, FIG. 9).
The disadvantage of this controller which represents the closest prior art of the claimed invention consists in that the rate of liquid flow through the gaps between the controller parts at further reduction of the minimal flow rate becomes commensurate with the rate of liquid flow through the throttling device, wherefore the accuracy in the setting of the required flow rate diminishes appreciably, particularly at the low power setting, which is of special importance in the engine starting mode.
Besides, the known controller calls for special devices making it possible to change the engine fuel supply from an additional inlet branch pipe (the starting tank) to the main inlet branch pipe (main fuel manifold).
OBJECTS OF THE INVENTION
It is an object of the present invention to eliminate the above-mentioned disadvantages by providing a flow-rate controller capable of starting the engine at a fixed setting of the fuel control device (shaft) and assuring a higher accuracy of the additional supply of working medium to the flow-rate controller.
It is another object of the present invention to improve the accuracy of the flow-rate controller operation at engine low power and permit changing the controller supply from an additional inlet branch pipe to the main inlet branch pipe.
SUMMARY OF THE INVENTION
In accordance with these objects, the present invention resides in that a liquid flow-rate controller which is made in the form of a casing with the main inlet and outlet branch pipes and comprises: a stationary front guide bush with front orifices and a lateral partition limiting the internal space of said bush to form an inlet space communicating directly with the main branch pipe; a sleeve arranged coaxially with said front guide bush and caused by a mechanically connected actuator to slide ever and along it with a possibility of covering the front orifices; a stationary rear guide bush located in line with the front guide bush and having outlet orifices in its walls; a piston-type slide valve with skirt arranged between said lateral partition and said rear guide bush to form a piston space limited by said lateral partition, the piston being spring-loaded on the side of the rear guide bush and capable of making contact with said lateral partition; a passage space formed between the casing and said front and rear guide bushes whereby the inlet space communicates with the outlet branch pipe via the front and outlet orifices, the holes in the aforesaid piston skirt enabling the skirt cavity to communicate with said passage space, and the rear portion of the skirt fitted freely on the rear guide bush having a possibility to cover the latter's outlet orifices, is provided additionally with a nonreturn valve and a throttle adjuster arranged in the channel connecting said inlet space with said passage space, and the controller casing is provided additionally with an inlet branch pipe arranged in the front portion of said casing and connected to the inlet space through the inlet holes in said front guide bush fitted in a controllable sleeve, said nonreturn valve being mounted in said main inlet branch pipe on the side of said inlet space, and said lateral partition being provided with holes to connect said inlet space with said piston space.
The nonreturn valve is a spring-loaded mushroom type with a stem arranged in the guide sleeve. The sleeve is installed on pylons located in the inlet space and secured on the front guide bush, whereas the mushroom-like head of the nonreturn valve is provided with an axial opening to maintain a partial vacuum in engine spaces.
REFERENCES:
patent: 3130747 (1964-04-01), Benaway
Cosmonautics Encyclopedia; Moscow; 1985, p. 16.
Grebnev Mikhail Jurievich
Gromyko Boris Mikhailovich
Kartysh Viktor Antonovich
Khrenov Igor Ivanovich
Blakely & Sokoloff, Taylor & Zafman
Michalsky Gerald A.
Otkrytoe Aktsioneirnoe Obschestvo “Nauchnoproizvodstvennoeobiend
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