KR101452978B1

KR101452978B1 - Valve for controlling thrust

Info

Publication number: KR101452978B1
Application number: KR1020130085348A
Authority: KR
Inventors: 박성한; 임성택; 이지형; 황용석; 김연철
Original assignee: 국방과학연구소
Priority date: 2013-07-19
Filing date: 2013-07-19
Publication date: 2018-04-27

Abstract

The present invention relates to a thrust control valve, and more particularly, to a valve for thrust control, which comprises a valve case serving as a structure, a curved guide member formed inside the valve case for guiding the flow of the fluid, The other side of the nozzle neck is located upstream of the nozzle neck and reciprocates to adjust the amount of fluid flowing into the nozzle neck. The nozzle neck, which increases the pressure of the fluid, is formed through the valve case and the guide member. A sealing member disposed between the guide member and the pintle assembly to maintain airtightness of the fluid and an actuator rod disposed at a rear end of the pintle assembly to move the pintle assembly, Heat transfer in the high temperature and high pressure environment for a long time It was to be maintained.

Description

[0001] VALVE FOR CONTROLLING THRUST [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a throttle control valve, and more particularly, to a throttle control valve for controlling a thrust force by regulating the amount of gas released when a gas of high temperature and high pressure is discharged to the outside, Valve.

Generally, a high-temperature gas flow control technology is applied to a thrust magnitude control valve capable of regulating the magnitude of thrust by discharging it to the atmosphere by regulating the flow rate of the hot gas generated by the combustion of the propellant.

The development direction of modern guided weapons has been demanded continuously for high maneuverability, precision strike ability, controllability of range control, and reduction of operational risk, and propulsion technology with all advantages of solid propulsion system is required to satisfy this trend. Particularly, a solid propulsion technology capable of freely adjusting the thrust magnitude such as a liquid propulsion system has been attracting much attention, which is called continuous variable thrust solid propulsion technology (hereinafter referred to as "variable propulsion technology").

Among the above variable propulsion technologies, the pintle method is currently being studied most actively. The operation principle of the pintle propulsion engine (hereinafter, referred to as 'pintle propulsion engine') is to control the combustion chamber pressure by controlling the nozzle neck area by changing the position of the pintle installed in the combustion chamber, Is a solid propellant that can be freely adjusted in size.

In the method using the pintle, the pintle installed in the vicinity of the nozzle neck in the combustion chamber is moved back and forth to adjust the nozzle neck area. This method does not have a large influence on the main flow since the pintle is installed in the same direction as the main flow. Therefore, the thrust loss can be minimized. In addition, this method has the advantage of being able to predict the nozzle neck area according to the pintle position and to maintain the combustion chamber pressure change linearly.

1 shows a valve assembly of a conventional pintle propulsion engine. Referring to FIG. 1, a high-temperature, high-pressure fluid A flowing along a combustion tube 30 flows into a housing 20, And the thrust is generated by the amount of the fluid passing through the nozzle neck 50. In this case, The drive shaft 70 is connected to an actuator 80 exposed to the outside of the valve assembly 10 so that the drive shaft 70 can move .

If the pintle 60 moves away from the nozzle neck 50, the area of the nozzle neck 50 increases and the pressure in the housing 20 decreases. The pressure reduction decreases the combustion rate of the propellant (not shown), thereby reducing the amount of generated gas, and the mass flow rate of the combustion gas flowing through the nozzle neck 50 decreases in spite of the increase in the area of the nozzle neck 50, .

On the other hand, when the pintle 60 is moved close to the nozzle neck 50 and the area of the nozzle neck 50 is reduced, the pressure in the housing 20 is increased and a large amount of combustion gas is generated due to an increase in the burning speed. The mass flow rate passing through the nozzle neck 50 is increased and the thrust is increased even though the area is decreased. Therefore, when the size of the nozzle neck 50 is controlled at a desired point, the thrust of the solid propellant can be controlled.

Since the valve assembly 10 is exposed to a high temperature and high pressure environment, thermal structural problems are caused, and in particular, a pneumatic structure is required when the flow control pintle assembly 60 is driven.

Conventionally, as shown in FIG. 1, when the operating fluid is kept at a high temperature by the rubber ring 85 during driving, the rubber ring 85 is melted by the heat of the gas b transmitted along the driving shaft 70, Therefore, the airtightness is not maintained for a long time. Particularly, there has been a case where the gas (b) leaks to the outside through the contact surface (90) where the drive shaft (70) contacts with the housing (20).

In order to solve such a problem, a valve assembly 10 shown in Fig. 2 has been proposed, in which the valve assembly 10 of Fig. 2 has the same configuration as that used in the valve assembly 10 shown in Fig. 1 The same reference numerals are used, and a detailed description of the overlapping portions is omitted.

2, a graphite liner 22 is provided for sealing the drive shaft 70 reciprocating in the axial direction so that the graphite liner 22 and the drive shaft 70 contact the contact surfaces 22b and 22c, And a groove 20a is formed in the inner peripheral surface of the graphite liner 22 so that the gas b flowing into the groove 20a is discharged vertically to the moving direction X of the drive shaft 70 And the high temperature gas b penetrating into the gap between the drive shaft 70 and the graphite liner 22 is discharged to the outside so that the heat transfer of the working fluid toward the drive shaft 70 can be minimized.

However, such a structure alone can maintain high-temperature airtightness, but graphite abrasion occurs due to axial reciprocation of the rod, and complete airtightness can not be achieved. Further, there is a problem that it is difficult to apply the present invention when the high-temperature gas discharged to the discharge path 21 affects the peripheral device of the thrust control valve.

In order to solve the above problems, the present invention provides a thrust control valve that maintains airtightness even in a high temperature and high pressure environment.

In one or more embodiments of the present invention, the valve case; A curved guide member formed inside the valve case to guide a flow of the fluid; A nozzle neck formed in the guide member to increase the pressure of the fluid introduced through the guide member; One side of which is formed through the valve case and the guide member and the other side of which is located upstream of the nozzle neck and reciprocates to adjust the amount of fluid flowing into the nozzle neck; A sealing member provided between the guide member and the pintle assembly to maintain airtightness of the fluid; And an actuator rod positioned at a rear end of the pintle assembly to move the pintle assembly.

The pintle assembly comprising: a pintle stem comprising a cylindrical rod; and a pintle head formed at an end of the pintle stem; A heat-resistant tube which surrounds a part of the outer periphery of the pintle stem and shields heat; And the outer diameter of the pintle stem is the same as the outer diameter of the heat-resistant tube. One end of the pintle stem is in contact with the heat-resisting tube and the pintle stem is inserted and fixed in the inner periphery thereof by a pin, Shaped tube.

The guide member may be formed of a heat resistant material, an inlet guide member through which the fluid first flows, and an enlarged portion guide member surrounding the nozzle neck.

The sealing member may be formed between the H-shaped tube and the inlet guide member and may be made of graphite. A graphite foil is formed between the sealing member and the valve case along the outer circumferential surface of the H- May be formed.

In addition, an O-ring for double air tightness may be formed between the H-shaped tube and the valve case.

In addition, in one or more embodiments of the present invention, the H-shaped tube includes a cylindrical pipe and a plate formed across the interior of the pipe, wherein the pintle stem is inserted into the interior of the pipe, A coupling gap is formed between the pintle stem and the plate, and between the actuator rod and the plate, and the pintle, the H-shaped tube and the pin may be made of a rhenium-based metal material.

According to the embodiment of the present invention, since the heat transfer is minimized by the O-ring, the airtightness can be maintained in a high-temperature and high-pressure environment for a long time and the graphite sealing member and the O-ring only come into contact with each other during the axial reciprocating movement of the actuator rod.

Also, since the graphite sealing member is used as a load supporting point, the bending load of the pintle stem is smaller than that of the actuator rod, thereby improving the structural safety and facilitating the manufacture and assembly of the pintle assembly.

Figures 1 and 2 are schematic views of a valve assembly in a conventional pintle propulsion engine,
3 is a sectional view of a thrust control valve according to an embodiment of the present invention,
4 is a schematic diagram of a pintle assembly in accordance with an embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described in detail below. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims.

Hereinafter, a throttle control valve of a pintle propulsion engine according to an embodiment of the present invention will be described in detail with reference to the drawings. In the present specification, similar components are denoted by similar reference numerals in different embodiments, and the description thereof is replaced with the first explanation. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

3 is a sectional view of a throttle control valve of a pintle propulsion engine according to the present invention.

The throttle control valve of the pintle propulsion engine according to an embodiment of the present invention includes a valve case 120 serving as a structure of a throttle control valve, a high-temperature high-pressure fluid (gas) (L-shaped) guide members 130 and 140 formed in the guide member 130 so as to increase the pressure of the fluid introduced through the guide members 130 and 140 The nozzle neck 135 is formed through one side of the valve case 120 and the guide member 140 and the other side is located upstream of the nozzle neck 135 and reciprocates to change the area of the nozzle neck 135 A pintle assembly 100 disposed at the rear end of the pintle assembly 100 to adjust the amount of fluid flowing into the nozzle neck 135 and to control the airtightness between the guide member 140 and the pintle assembly 100 Two of graphite material to maintain A is provided on the outside of the sealing member (150, 160), said sealing member (150, 160) comprises a graphite foil (170) (graphite foil) to allow sensitive and assembly tolerances.

The guide member 130 and 140 are made of a heat-resistant material and include an inlet guide member 140 for allowing a high-temperature and high-pressure fluid to flow in first, an inlet guide member 140 connected to the inlet guide member 140, And an enlarged portion guide member 130 surrounding the guide portion.

4, a pintle assembly 100 according to an embodiment of the present invention includes a pintle stem 114a made of a cylindrical rod, The pintle 114 includes a pintle head 114b formed at an end of the pintle 114a to adjust a flow rate of gas at a high temperature and an H type tube 110 for connecting the pintle 114 and the rod 115 of the actuator. A pin 112 connecting the pintle stem 114a and the H-shaped tube 110, and a heat-resistant tube 114 formed on the outer periphery of the pintle stem 114a for thermal protection of the pintle stem 114a by the high- (113).

The heat-resistant tube 113 surrounds only a part of the pintle stem 114a and the other is inserted into the H-shaped tube 110 and fixed to the H-shaped tube 110 by the pin 112, Shaped tube 110, the pintle 114, and the heat-resistant tube 113 are integrally moved. In this case, the heat-resistant tube 113 and the H-shaped tube 110 have the same outer diameter, and the pin 112 has the same outer diameter so that there is no part protruding at the time of reciprocating movement.

The H-shaped tube 110 includes a cylindrical pipe 110a and a plate 110b formed to extend across the inside of the pipe 110a. The H-shaped tube 110 is provided between the pintle stem 114a and the plate 110b And a coupling gap 190 is formed between the actuator rod 115 and the plate 110b. The coupling gap 190 can relieve the heat transfer at the contact interface between the plate 110b and the actuator rod 115 and the contact interface between the plate 110b and the pintle stem 114a. The pintle stem 114a is inserted and fixed in the pipe 110a.

An O-ring 180 is provided between the H-shaped tube 110 of the pintle assembly 100 and the valve case 120 for double sealing. The O- And the O-ring 180 is formed on the outside of the graphite foil 170.

The throttle control valve of the pintle propulsion engine of FIG. 3 is configured such that when the high-pressure gas according to the embodiment of the present invention flows in the direction of arrow A through the inlet guide member 140, And the size of the nozzle neck 135 due to the flow is changed according to the reciprocating motion, so that the flow rate of the gas is adjusted.

When the high-temperature and high-pressure gas is introduced at a high speed through the inlet guide member 140, the gas directly hits the pintle 114. At this time, severe abrasion or excessive thermal stress may occur in the pintle stem 114a have. In order to prevent this, in the embodiment of the present invention, the heat-resistant tube 113 for heat insulation is inserted between the pintle 114 and the H-shaped tube 110 and the heat transfer of the hot gas directly bumping against the pintle 114 is transmitted to the pintle head 114b. To the downstream in the axial direction.

The plate 110b of the H-shaped tube 110, which faces the rod 115 of the actuator, is positioned between the plate 110b of the H-shaped tube 110 facing the end of the pintle stem 114a, A coupling gap 190 is formed in the space 191 so that the heat transfer in the axial direction is reduced by the air layer.

The pintle assembly 100 composed of the pintle 114, the H-shaped tube 110 and the fin 112 is made of a rhenium-based metal material and passes through the pintle 114 and the H- Holes are formed by inserting the pins 112, welding, and surface treatment. The O-ring 180 is inserted into the H-shaped tube 110 in order to achieve complete airtightness of the gas flow due to the clearance because there is a gap between the pintle assembly 100 and the inlet guide member 140, And the valve case (120).

However, since the hot gas discharged by the gap may directly hit the O-ring 180 to cause airtight breakage, the first sealing member 150 and the second sealing member 160 may be inserted into the inlet guide member 140 so as to block the gap between the pintle assembly 100 and the inlet guide member 140. [

The first and second sealing members 150 and 160 formed of the graphite material serve as dual bearings as well as serve as a heat shield for the gap and support the bending load of the pintle assembly 100. Accordingly, since the moment arm is smaller than the load supporting point of the actuator rod 115, it is structurally safe during the bending load operation, and the pintle assembly 100 can be reduced in weight.

Further, since the material is graphite, frictional resistance can be minimized when the pintle assembly 100 is driven in the axial direction. The gap between the graphite sealing member (150, 160) and the valve case (120) is filled with a graphite foil (170) to allow airtight and assembly tolerances. The graphite foil 170 is formed along the outer peripheral surface of the H-shaped tube 110.

The temperature rise of the O-ring 180 is generated only by the heat transfer from the pintle head 114b and the temperature difference between the intermediate air layer 190 and the trains of the graphite sealing members 150 and 160 The temperature rise in the O-ring 180 is insignificant even when the combustion is prolonged for a long time, and the complete airtightness of the high-temperature and high-pressure thrust control valve is realized.

The above-described throttle control valve of the pintle propulsion machinery can be applied to a configuration and a method of the above-described embodiments in a limited manner, but the embodiments can be applied to all or some of the embodiments As shown in FIG.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention .

Claims

Valve case;
A curved guide member formed inside the valve case to guide a flow of the fluid;
A nozzle neck formed in the guide member to increase the pressure of the fluid introduced through the guide member;
One side of which is formed through the valve case and the guide member and the other side of which is located upstream of the nozzle neck and reciprocates to adjust the amount of fluid flowing into the nozzle neck;
A sealing member provided between the guide member and the pintle assembly to maintain airtightness of the fluid; And
And an actuator rod positioned at a rear end of the pintle assembly to move the pintle assembly,
Wherein the pintle assembly comprises:
A pintle comprising a pintle stem made of a cylindrical rod and a pintle head formed at an end of the pintle stem;
A heat-resistant tube which surrounds a part of the outer periphery of the pintle stem and shields heat; And
The outer diameter of the heat-resistant tube is the same as the outer diameter of the heat-resistant tube, one side of the heat-resistant tube is in contact with the heat-resistant tube, and the pintle stem is inserted and fixed by the pin to move integrally with the pintle, Thrust control valves including tubes.

delete

The method according to claim 1,
Wherein the guide member is made of a heat resistant material and comprises an inlet guide member into which the fluid first flows and an enlarged portion guide member surrounding the nozzle neck.

The method of claim 3,
Wherein the sealing member is formed between the H-shaped tube and the inlet guide member, and is made of graphite.

5. The method of claim 4,
And a graphite foil is formed between the sealing member and the valve case along the outer circumferential surface of the H-shaped tube.

6. The method of claim 5,
And an O-ring for double air tightness is formed between the H-shaped tube and the valve case.

The method according to claim 1,
The H-shaped tube includes a cylindrical pipe and a plate formed across the inside of the pipe, the pintle stem being inserted into the pipe,
Wherein a coupling clearance is formed between the pintle stem and the plate and between the actuator rod and the plate.

The method according to claim 1,
The pintle, the H-shaped tube, and the pin are made of a rhenium-based metal material.