JP2760025B2 - Rocket mounting oil tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a rocket mounting oil tank used for supplying hydraulic oil by a gas pushing method in a hydraulic drive device such as a movable nozzle drive device of a rocket. (Prior Art) Generally, it is well known that a rocket hydraulic drive device uses a gas-push type oil tank which is excellent in terms of weight reduction, simplification of structure, reliability and the like. For example, there was a tank as shown in FIG. 6 and FIG. The tank 100 in the figure is used for a movable nozzle driving device, and an internal space is divided into a pressure chamber 102 and a lower storage chamber 103 at an upper part by a piston 101 accommodated up and down freely, and a piston It has a stopper 104 for regulating the rising position of 101. Above and below the tank 100, a gas flow passage 105 communicating with the pressure chamber 102, and a storage chamber
An oil flow passage 106 communicating with 103 is provided. These flow passages 105 and 106 are provided with valves (not shown) for gas discharge and hydraulic oil supply. The above-mentioned tank 100 is mounted on a rocket in an empty state, and a helium gas cylinder 107 and a servo valve 108 are connected to a gas flow path 105 and an oil flow path 106. The servo valve 108 is connected to an actuator 110 connected to a movable nozzle 109, and operates based on a rocket attitude control signal. Further, after the volume of the storage chamber 103 is reduced to zero by the lowering of the piston 101, the tank 100
Hydraulic oil 111 is supplied from 06 to the storage chamber 103, and the filling is completed when the raised piston 101 comes into contact with the stopper 104. After the launch of the rocket, high pressure helium gas is sent from the cylinder 107 into the pressure chamber 102, and the piston 101 is pushed by the pressure to cause the hydraulic oil 1 to move.
11 is fed to the servo valve 108 by pressure. In addition, servo valve 1
In 08, the hydraulic oil returned from the actuator 110 is discharged outside. (Problems to be Solved by the Invention) Here, in the oil tank for mounting a rocket as described above, extremely high-precision control is required in a hydraulic drive device such as a movable nozzle drive device. At the time of filling, it is necessary to pay close attention so that air which causes a pressure change or the like during control does not enter. However, in practice, it is difficult to completely remove the air mixed with the hydraulic oil itself, and moreover, an operating procedure in which an oil tank is mounted on a rocket in advance and the hydraulic oil is filled before launch. Therefore, there is a problem that air (indicated by a symbol A in FIG. 6) may accumulate in the storage chamber after filling, and it is very difficult to remove this air. It has been an issue to solve various problems. (Object of the Invention) The present invention has been made in view of the conventional problems as described above, and evacuates air in a storage chamber along with filling of hydraulic oil without causing hydraulic oil to flow into a pressure chamber. It is an object of the present invention to provide a rocket-mounted oil tank that can perform filling work easily.

Configuration of the Invention

(Means for Solving the Problems) In an oil tank for mounting a rocket according to the present invention, an upper pressure chamber is divided into a lower storage chamber by a piston movable up and down in the tank, and gas is supplied to the pressure chamber. In the rocket mounting oil tank that pushes the piston to pump hydraulic oil in the storage chamber, the piston closes the air release hole communicating from the storage chamber to the pressure chamber and the air release hole from the pressure chamber side. A plug with a built-in check valve is provided, and a socket in which the plug is engaged at a position where the piston ascends, and a discharge flow path communicating from the inside of the socket to the outside of the tank are provided at the top of the tank; and The above configuration is used as a means for solving the conventional problems by providing a configuration in which a flow path opening / closing valve is provided in the discharge flow path. (Operation of the Invention) In the rocket mounting oil tank according to the present invention, when the flow passage opening / closing valve is kept open and the hydraulic oil is pressurized and injected into the storage chamber, the piston rises and the plug and the socket are separated. The check valve inside the plug is opened by the pressure of the hydraulic oil, and the air vent hole, the inside of the plug,
The inside of the socket and the discharge passage communicate with each other to discharge the air in the storage chamber to the outside. Thereafter, when the flow passage opening / closing valve is closed and the injection of the hydraulic oil is stopped, the check valve is closed, and a state in which the storage chamber is filled with the hydraulic oil without residual air is obtained. In addition, when the gas is supplied to the pressure chamber due to the blockage of the flow path opening / closing valve, the hydraulic pressure that has flowed into the discharge flow path by the gas pressure is prevented from flowing out into the pressure chamber. Hereinafter, the present invention will be described with reference to the drawings. 1 to 5 are diagrams for explaining an embodiment of the present invention. That is, the tank 1 shown in FIG. 1 has a cylindrical shape, and its internal space is divided into a pressure chamber 3 and a lower storage chamber 4 at the upper part by a piston 2 housed vertically.
Therefore, the volumes of the pressure chamber 3 and the storage chamber 4 change in inverse proportion with the vertical movement of the piston 2. The tank 1 has an inward flange-like stopper 5 for regulating the ascending position of the piston 2 near the upper end inside, and a gas flow communicating with the pressure chamber 3 near the side of the upper wall. A passage 6 is provided, and an oil flow passage 7 communicating with the storage chamber 4 is provided at the center of the substantially hemispherical bottom wall projecting upward. The piston 2 has, on its lower surface, a substantially hemispherical concave portion 8 corresponding to the bottom wall of the tank 1, and has an outer peripheral portion in contact with the inner surface of the tank 1 to keep the airtightness between the two chambers 3, 4. An O-ring 9 is fitted. The piston 2 has an air vent hole 10 formed at the center thereof and communicating with the pressure chamber 3 from the storage chamber 4 so as to open to the top of the concave portion 8. A plug 12 containing a first check valve 11 that closes from the third side is provided. The plug 12 has a large diameter portion.
The first check valve 1 has a cylindrical shape in which a small-diameter portion 12c is connected to an upper end of a 12a via a tapered portion 12b, and inside the large-diameter portion 12a.
A retainer 13 holding 1 is fixed. The retainer 1
Reference numeral 3 denotes a central portion which guides the valve rod 11a of the first check valve 11 so as to be movable up and down, and has a plurality of flow holes 13a which are open up and down around the guide portion. The first check valve 11 has a spring 14 interposed between the first check valve 11 and the retainer 13.
Accordingly, the air vent hole 10 is urged to close. On the upper wall of the tank 1, a socket 15 facing the plug 12 is provided integrally with the tank 1. This socket 15 may be separate from the tank 1. The socket 15 is provided with an engagement opening 15a having an inner diameter corresponding to the small diameter portion 12c of the plug 12 toward the inside of the tank 1, and operates in the same direction as the first check valve 11 to raise the opening 15a upward. A second check valve 16 that closes from the inside is built in. The second check valve 16 is a first check valve.
Similarly to 11, the valve stem 16a is held by the retainer 17 fixed inside the socket 15 so as to be vertically movable,
The opening 15a is urged to be closed by a spring 18 interposed between the retainer 17 and the spring 18. In addition,
An O-ring 19 is fitted inside the opening 15a, and the retainer 17 has a plurality of through-holes that open vertically.
17a is formed. Further, a discharge flow path 20 communicating with the outside of the tank 1 is provided at an upper end of the socket 15, and a flow opening / closing valve 21 is provided in the discharge flow path 20. The position of the plug 12 and the socket 15 is set such that the small-diameter portion 12c and the opening 15a are completely engaged with each other when the raised piston 2 is restricted in position by the stopper 15. The above-mentioned tank 1 is mounted on a rocket in an empty state,
The gas flow passage 6 is connected to a cylinder of an inert gas such as helium gas, and the oil flow passage 7 is connected to, for example, a servo valve constituting a movable nozzle driving device. Each of the flow passages 6 and 7 is provided with an on-off valve, a valve for supplying hydraulic oil, and the like. Next, a procedure for filling the inside of the storage chamber 4 of the tank 1 with the hydraulic oil 22 will be described.
As shown in FIG. 2, the flow path on-off valve 21 is kept open. Next, when the operating oil 22 is pressurized and injected from the oil flow passage 17 at a pressure necessary to raise the piston 2, the piston 2 rises, and the piston 2
The small diameter portion 12c of the plug 12
In the opening 15a. At this time, since the plug 12 is located at the center of the piston 2 and the socket 15 is provided corresponding to the plug 12, the above-described engagement is reliably performed even when the ascending piston 2 rotates. Will be Then, when the pressurized injection of the hydraulic oil 22 is further continued, the pressure of the hydraulic oil 22 starts to increase, and the pressure of the hydraulic oil 22 exceeds the repulsive force of the spring 14 in the plug 12 as shown in FIG. After the first check valve 11 is opened when the pressure becomes higher, the second check valve 16 is opened when the pressure exceeds the repulsive force of the spring 18 in the socket 15. Become. As a result, the air remaining in the storage chamber 4 and the air mixed in the hydraulic oil 22 are removed from the air vent hole 10, the inside of the plug 12, and the socket as shown by arrows in FIG.
It is discharged to the outside through the inside of the nozzle 15 and the discharge channel 20. This air bleeding is further completed, for example, by performing until the hydraulic oil 22 overflows through the same path.
Thereafter, when the flow path opening / closing valve 21 is closed and the pressurization of the hydraulic oil 22 is stopped, the pressure in the storage chamber 4 becomes equal to the atmospheric pressure, and as shown in FIG. The first and second check valves 11, 16 return due to the repulsive force, and the air vent hole 1
0 and the opening 15a are closed, and the filling of the hydraulic oil 22 is completed. At this time, the hydraulic oil 22a also flows into the socket 15 and the discharge channel 20. During this time, the sealing between the plug 12 and the socket 15 is maintained by the O-ring 19 in the opening 15a. Therefore, the hydraulic oil 22 leaks into the pressure chamber 3, and the mist of the hydraulic oil 22 formed by the repetitive operation of the piston 2 is transferred to, for example, a servo valve (reference numeral in FIG. 7).
There is no concern that it will get into the valve surface if it gets into Next, after the launch of the rocket, as shown in FIG. 5, high-pressure gas is sent from a gas cylinder (not shown) to the pressure chamber 3 through the gas flow passage 6 to push the piston 2 at that pressure, and the storage chamber is released. The hydraulic oil 22 in the oil flow passage 7
From the hydraulic pressure receiving side such as a servo valve. At this time, as the piston 2 descends, the plug 12
However, since the air vent hole 10 of the plug 12 is closed by the first check valve 11 from the pressure chamber 3 side, gas does not flow into the storage chamber 4. On the other hand, socket
In 15, the second check valve 16 is opened by the gas pressure inside the pressure chamber 3, but the passage opening / closing valve 21 of the discharge passage 20 is closed, so that the socket 15 and the discharge passage
The hydraulic oil 22a flowing into the pressure chamber 20 is pressed by the gas pressure and does not flow out into the pressure chamber 3. Further, the pressure in the pressure chamber 3 does not decrease at all. Further, even when the supply of gas is stopped, the pressure in the pressure chamber 3 is reduced and the second spring is operated by the action of the spring 18.
Since the check valve 16 returns to the closed state, the hydraulic oil 22a in the socket 15 and the discharge flow path 20 does not flow into the pressure chamber 3 at all. As described above, the tank 1 shown in the above-described embodiment is capable of storing the residual air or the hydraulic oil 22 in the process of pressurizing and injecting the hydraulic oil 22 even if the piston 2 is not completely lowered in the empty state. Since the air mixed into the storage chamber 4 is completely discharged, a very good filling state with no residual air in the storage chamber 4 can be obtained by a simple operation. Pressure chamber 3 during operation
Since the hydraulic oil does not flow into the rocket, it is possible to continuously supply the hydraulic oil at a constant pressure to the hydraulic drive device of the rocket that requires high-precision control. The configuration of the oil tank for mounting a rocket according to the present invention is not limited to the above-described embodiment. For example, the details of plugs and sockets and the type of a flow path opening / closing valve can be appropriately changed. In addition, by providing filters in the gas flow passage 6, it is also possible to more reliably prevent the inflow of the mist-formed hydraulic oil.

【The invention's effect】

As described above, the rocket-mounted oil tank of the present invention is configured such that the inside of the tank is divided into an upper pressure chamber and a lower storage chamber by a vertically movable piston, and gas is supplied to the pressure chamber. In a rocket mounting oil tank that pushes a piston to pump hydraulic oil in a storage chamber, an air vent hole that communicates with the piston from the storage chamber to the pressure chamber, and a check valve that closes the air vent hole from the pressure chamber side. A socket in which the plug is engaged at the upper limit position of the piston, and a discharge flow path communicating from inside the socket to the outside of the tank. A flow path opening / closing valve is provided in the passage, so that the air in the storage chamber can be reliably discharged together with the filling of the hydraulic oil, and it can be used at the time of filling the hydraulic oil and operating by gas pressurization. Hydraulic oil can be prevented from flowing into the pressure chamber, and air can be vented using the pressure when hydraulic oil is filled, regardless of the position of the piston when the rocket is mounted, making filling work extremely easy. It has excellent effects such as

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a rocket mounting oil tank according to an embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating a state in which hydraulic oil is being filled, and FIG. 3 is a plug in FIG. FIG. 4 is an enlarged cross-sectional view illustrating a connection portion between a socket and a socket.
FIG. 5 is a cross-sectional view of an upper portion of the tank illustrating a state in which hydraulic oil is completely filled, FIG. 5 is a cross-sectional view illustrating an operating state in which gas is supplied into the pressure chamber, and FIG. FIG. 7 is an explanatory view schematically showing the oil tank and the movable nozzle driving device shown in FIG. 1 ... tank, 2 ... piston, 3 ... pressure chamber, 4 ...
Storage room, 10 ... air vent hole, 11 ... 1st check valve, 12
…… Plug, 15… Socket, 20 …… Discharge channel, 21 ……
Flow path on-off valve, 22,22a ... Hydraulic oil.

Claims (1)

(57) [Claims] The tank is divided into an upper pressure chamber and a lower storage chamber by a piston which can move up and down, and a gas is supplied to the pressure chamber to push the piston so that hydraulic oil in the storage chamber is released. In a rocket mounting oil tank for pressure feeding, the piston is provided with an air vent hole communicating from the storage chamber to the pressure chamber, and a plug having a built-in check valve for closing the air vent hole from the pressure chamber side. To
A socket in which the plug engages at a position where the piston is ascended, a discharge passage communicating from inside the socket to the outside of the tank, and a passage opening / closing valve provided in the discharge passage. Rocket mounting oil tank.