CN112984146A - Ball valve device for liquid rocket engine - Google Patents
Ball valve device for liquid rocket engine Download PDFInfo
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- CN112984146A CN112984146A CN202110162467.6A CN202110162467A CN112984146A CN 112984146 A CN112984146 A CN 112984146A CN 202110162467 A CN202110162467 A CN 202110162467A CN 112984146 A CN112984146 A CN 112984146A
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- diaphragm
- cover plate
- ball
- valve seat
- rocket engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
Abstract
The invention provides a ball valve device for a liquid rocket engine, which comprises a shell, a ball body, a driving device, a valve seat, a diaphragm capsule assembly and a fixed cover, wherein a channel for liquid medium to flow is arranged in the shell; the valve seat, the diaphragm capsule assembly and the fixed cover are positioned at the medium inlet end of the shell, and the valve seat is nested at the inner side of the diaphragm capsule assembly and used for realizing the sealing of the medium channel by contacting the ball body; the outer side of the diaphragm box assembly is fixedly connected with the shell, the diaphragm box assembly is provided with a pneumatic control cavity and a diaphragm structure, and the diaphragm structure is communicated with the pneumatic control cavity; an elastic part is arranged between the fixed cover and the diaphragm box assembly, and before the liquid medium circulates, the pneumatic control cavity is ventilated, so that the diaphragm structure expands to overcome the elasticity of the elastic part and drive the valve seat to be separated from the ball body. The friction between the sealing surface of the valve seat in the ball valve and the surface of the ball body can be avoided, and the ball valve is safe and reliable.
Description
Technical Field
The invention relates to the technical field of valves of power systems, in particular to a ball valve device for a liquid rocket engine.
Background
With the rapid development of the aerospace industry, all the technologies related to the rocket field also realize the rapid advance. The valve is an important part for realizing the starting and shutdown of the liquid rocket engine. The medium of the low-temperature liquid rocket engine is an ultralow-temperature propellant, the medium temperature range is usually about 20K-120K, and the pressure is more than 10 MPa. The valve operating gas is usually a high-pressure gas having a pressure of about 20 MPa.
Ball valves are an important component of liquid rocket engine propellant supply systems. The ball valve can be opened and closed on command. At the initial moment when the ball valve is opened and fuel is cut off, because the ball body in the ball valve is in direct contact with the valve seat, the ball body can cause the friction between the sealing surface of the valve seat and the surface of the ball body when rotating, and the abrasion between the ball body and the valve seat is caused. The sealing performance of the valve seat sealing pair can be reduced after long-time use, the service life of the ball valve is greatly shortened, and the reduction of the sealing performance can directly influence the fuel supply and further influence the safety of an engine; in addition, since the sealing surface of the valve seat directly contacts with the surface of the ball, a driving mechanism for driving the ball valve to rotate needs to output a larger driving force, resulting in a more complicated structure of the apparatus.
It is highly desirable to provide a ball valve assembly that increases the life of the ball valve without compromising the sealing effect, while reducing the complexity of the apparatus.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a ball valve device for a liquid rocket engine, which avoids the friction between a valve seat sealing surface inside a ball valve and the surface of a ball body by optimizing the inside of the ball valve, prolongs the service life of the ball valve without influencing the sealing effect, reduces the complexity of equipment, is safe and reliable, and reduces the complexity of the equipment, thereby improving the working reliability and efficiency of the liquid rocket engine.
The invention provides a ball valve device for a liquid rocket engine, which comprises a shell, a ball body, a driving device, a valve seat, a diaphragm capsule assembly and a fixed cover, wherein,
a channel for liquid medium to circulate is arranged in the shell, the ball body is driven to rotate by the driving device, so that the channel body on the ball body and the channel are mutually communicated or closed, and the circulation or the stop of the liquid medium is realized;
the valve seat, the diaphragm capsule assembly and the fixed cover are positioned at the medium inlet end of the shell, and the valve seat is nested at the inner side of the diaphragm capsule assembly and used for realizing the sealing of a medium channel by contacting the ball body; the outer side of the diaphragm box assembly is fixedly connected with the shell, the diaphragm box assembly is provided with a pneumatic control cavity and a diaphragm structure, and the diaphragm structure is communicated with the pneumatic control cavity;
an elastic component is arranged between the fixed cover and the diaphragm capsule component, and applies elasticity to the diaphragm capsule component to enable the valve seat and the ball body to be sealed with each other;
before the liquid medium circulates, the pneumatic control cavity is ventilated, so that the diaphragm structure in the diaphragm box assembly expands to overcome the elasticity of the elastic component and drive the valve seat to be separated from the ball body.
In the same embodiment, the diaphragm capsule assembly comprises an upper cover plate, a middle cover plate, a lower cover plate and the diaphragm structure, the diaphragm structure comprises a large diaphragm group and a small diaphragm group, wherein,
the upper cover plate with well apron interconnect forms first space, the upper cover plate with well apron is close to the axis end of passageway respectively with little diaphragm group with big diaphragm group connects, little diaphragm group with the big diaphragm group other end respectively with lap upper surface connection down, little diaphragm group big diaphragm group lap down and form the second space, first space with the second space constitutes a sealed chamber, just first space with the second space communicates each other.
In the same embodiment, the upper cover plate is close to a supporting table on one side of the ball body, the supporting table is used for guiding the valve seat when the valve seat moves towards one side of the fixed cover, the end, close to the fixed cover, of the valve seat is connected with the lower cover plate, and gas passes through the first space and the second space and then acts on the lower cover plate, so that the lower cover plate drives the valve seat to move to reduce the separation of the valve seat and the ball body.
In the same embodiment, the outer side of the upper cover plate, which is far away from the axis of the channel, is provided with a convex part used for being connected with the shell, and the convex part faces to the side far away from the lower cover plate and is of a cylindrical structure with two communicated ends.
In the same embodiment, the upper cover plate and the middle cover plate are integrally formed.
In the same embodiment, the middle cover plate is a ring-shaped solid of revolution structure, and the middle cover plate is provided with protruding plates protruding in the same direction near the inner ring edge and the outer ring edge, and the middle cover plate is connected with the lower surface of the upper cover plate through the end parts of the protruding plates, so that the middle cover plate and the lower surface of the upper cover plate form the first space.
In the same embodiment, one side of the middle cover plate, which is far away from the axis of the channel, is respectively provided with an air inlet pipeline and an air outlet pipeline, and the air inlet pipeline and the air outlet pipeline are symmetrically designed according to the axis.
In the same embodiment, big diaphragm group comprises a plurality of metal sheets that have the large aperture, little diaphragm comprises a plurality of metal sheets that have the small aperture, little diaphragm group inboard is close to the surface of disk seat, the outside with big diaphragm group's inboard sets up relatively, big diaphragm group's the outside with the internal surface butt of fixed lid, the metal sheet of large aperture and the metal sheet of small aperture are end to end connection in proper order respectively, make big diaphragm group the small diaphragm group forms the inside and outside and is sawtooth shape, guarantees the diaphragm capsule subassembly can stretch out and draw back along the axis direction.
In the same embodiment, a groove is circumferentially formed on the surface of one side of the valve seat, which is close to the ball body, and a sealing ring is arranged in the groove.
In the same embodiment, the elastic member is a spring, and the fixing cover is provided with a lower concave portion for fixing the spring.
The ball valve for the liquid rocket engine provided by the embodiment of the invention comprises a shell, a ball body, a driving device, a valve seat, a diaphragm capsule assembly and a fixed cover. Through be equipped with the elastic component between fixed lid and diaphragm capsule subassembly, the elastic component exerts elasticity to the diaphragm capsule subassembly and makes disk seat and spheroid sealed each other, reduces liquid medium and leaks. Before the liquid medium circulates, ventilate to the pneumatic control chamber for the inside diaphragm structure inflation of diaphragm capsule subassembly is in order to overcome the elasticity of elastic component, and drives disk seat and spheroid separation, avoids the inside disk seat sealing surface of ball valve and spheroid surface friction, guarantees that disk seat and spheroid are intact. In addition, the friction between the sealing surface of the valve seat and the surface of the ball body is reduced, so that the driving torque of the driving device is reduced, and the use limit range of the driving device is expanded. Whole valve structure through optimizing ball valve inside, avoids the inside disk seat sealing face of ball valve and spheroid surface friction, under the condition that does not influence sealed effect, improves the life of ball valve, reduces equipment complexity simultaneously, and safe and reliable reduces equipment complexity simultaneously to improve liquid rocket engine operational reliability and efficiency.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic view of a partial structure of a frictionless ball valve according to an embodiment of the present invention;
FIG. 2 is a cutaway partial schematic view of an elastomeric valve seat in an embodiment of the present invention;
FIG. 3 is a schematic view of a cutaway portion of an elastomeric valve seat in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a regulator orifice according to an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of a thickened plate according to an embodiment of the invention.
Description of reference numerals:
1 shell 2 sphere
3 drive means 4 valve seats
5 diaphragm structure 6 fixed cover
7 elastic piece 8 upper cover plate
9 middle cover plate and 10 lower cover plate
11 big diaphragm group and 12 small diaphragm groups
13 supporting table 14 boss
15 air inlet pipeline and 16 air outlet pipeline
17 groove 18 sealing ring
19 regulating orifice 20 rotary shaft
21 actuator 22 first bearing
23 outer end cap 24 first sealing gasket
25 extension of a second sealing gasket 26
27 thickened plate
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
One aspect of the present invention provides a ball valve apparatus for a liquid rocket engine. As shown in fig. 1, 2, 3 and 4, includes a housing 1, a ball 2, a driving device 3, a valve seat 4, a diaphragm cartridge assembly and a fixed cover 6. Wherein, be equipped with the passageway that supplies the liquid medium circulation in the casing 1, spheroid 2 drives the rotation through drive arrangement 3 to make the passageway body on spheroid 2 and passageway switch on or close each other, thereby realize the circulation or the end of liquid medium. The valve seat 4, the diaphragm capsule assembly and the fixed cover 6 are located at the medium inlet end of the shell 1, and the valve seat 4 is nested inside the diaphragm capsule assembly and used for sealing a medium channel through the contact ball 2. The outside and 1 fixed connection of casing of diaphragm capsule subassembly, diaphragm capsule subassembly have pneumatic control chamber and diaphragm structure 5, and diaphragm structure 5 intercommunication pneumatic control chamber. An elastic component 7 is arranged between the fixed cover 6 and the diaphragm capsule component, and the elastic component 7 applies elasticity to the diaphragm capsule component to enable the valve seat 4 and the ball 2 to be sealed; before the liquid medium circulates, the pneumatic control cavity is ventilated, so that the diaphragm structure 5 in the diaphragm box assembly expands to overcome the elasticity of the elastic element 7 and drive the valve seat 4 to be separated from the ball body 2.
Specifically, the ball valve for the liquid rocket engine comprises a shell 1, a ball body 2, a driving device 3, a valve seat 4, a diaphragm capsule assembly and a fixed cover 6. By arranging the elastic member 7 between the fixed cover 6 and the diaphragm capsule assembly, the elastic member 7 applies elasticity to the diaphragm capsule assembly so that the valve seat 4 and the ball 2 are sealed with each other, and the leakage of a liquid medium is reduced. Before the liquid medium circulation, ventilate to the pneumatic control chamber for the inside diaphragm structure 5 inflation of diaphragm capsule subassembly is in order to overcome the elasticity of elastic component 7, and drives disk seat 4 and spheroid 2 separation, avoids the inside disk seat sealing surface of ball valve and spheroid surface friction, guarantees that disk seat and spheroid are intact. Whole valve structure through optimizing ball valve inside, rotates the in-process at the ball valve, avoids the inside disk seat sealing face of ball valve and spheroid surface friction, under the condition that does not influence sealed effect, improves the life of ball valve, reduces ball valve drive arrangement's performance requirement simultaneously, improves liquid rocket engine operational reliability and efficiency.
As shown in fig. 1, 2 and 3, the membrane cartridge assembly includes an upper cover plate 8, a middle cover plate 9, a lower cover plate 10 and a membrane structure 5, and the membrane structure 5 includes a large membrane group 11 and a small membrane group 12. For example, the three cover plates are all hollow solid of revolution structures. Wherein the upper cover plate 8 and the middle cover plate 9 are connected with each other to form a first space. The axial line ends of the upper cover plate 8 and the middle cover plate 9 close to the channel are respectively connected with one ends of the small diaphragm group 12 and the large diaphragm group 11, and the other ends of the small diaphragm group 12 and the large diaphragm group 11 are respectively connected with the upper surface of the lower cover plate 10. The small diaphragm group 12, the large diaphragm group 11 and the lower cover plate 10 form a second space, the first space and the second space form a closed cavity, and the first space and the second space can be communicated through the through hole. In order to adjust the high-pressure gas conveniently and avoid the small diaphragm group 12 and the large diaphragm group 11 from deforming due to the impact of the high-pressure gas on the small diaphragm group 12 and the large diaphragm group 11, for example, the two ends of the through hole can be designed to be smaller in diameter of the inlet end than the outlet end.
In this embodiment, the first space is used for buffering the air flow, so that the damage of the air flow to the diaphragm due to overlarge pressure is avoided, and the service life of the diaphragm group can be prolonged. In addition, the second space can adjust the direction of the air flow, so that the air flow effectively acts on the lower cover plate 10, the movement of the lower cover plate 10 is convenient, and the movement of the valve seat is convenient to control. It should be noted that, for example, a support 13 is provided on the side of the upper cover plate 8 close to the ball 2, where the valve seat 4 is easy to move, and the support 13 is used for guiding the valve seat 4 to move toward the fixed cover 6 (so that the base moves along the surface of the support parallel to the axial direction). To facilitate the movement of the valve seat 4, for example, the valve seat 4 is connected to the lower cover plate 10 near the end of the fixed cover 6 so as to be integrated. When gas passes through the first space and the second space and then acts on the lower cover plate 10, the lower cover plate 10 drives the valve seat 4 to move, so that the direct contact between the valve seat 4 and the ball body 2 is reduced, and the abrasion of the ball valve in the rotating process is reduced. It should be noted that, in order to ensure that the valve seat 4 and the lower cover plate 10 are tightly connected and firmly fixed, for example, the two may be connected by welding.
In the present embodiment, in order to tightly connect the upper cover plate 8 with the housing 1 and prevent the upper cover plate 8 from shaking inside the housing 1, for example, a protrusion 14 for connecting with the housing 1 is provided on a side of the upper cover plate 8 away from the ball 2. Specifically, the protruding portion 14 is a cylindrical structure with two ends communicating with each other. In order to ensure that the protruding portion 14 is tightly connected with the casing 1 and firmly fixed, for example, the outer surface of the protruding portion 14 and the inner wall of the casing 1 are tightly attached to each other, and the two can be fixedly connected by a bolt (one end of the bolt penetrates through the casing 1 and the protruding portion 14, and ducts for matching the bolt are arranged in the casing 1 and the protruding portion 14, so as to facilitate the bolt to enter the casing 1 and the protruding portion 14, for example, the part of the bolt entering the casing is of a cylindrical structure, and the part entering the protruding portion 14 is composed of a cylinder and a cone).
It should be noted that, in this embodiment, the surface of the valve seat 4 along the circumferential direction and the surface of the upper cover plate 8 are designed to be an arc surface, so that the clamping stagnation of the valve seat 4 and the upper cover plate 8 of the diaphragm capsule assembly during the expansion and contraction movement of the elastic valve seat can be avoided, and the reliability of the ball valve action in the ultra-low temperature environment of the liquid rocket engine can be improved.
In addition, the upper cover plate 8 and the middle cover plate 9 can be fixed together by welding, and in practical application, in order to make the connection between the upper cover plate 8 and the middle cover plate 9 tighter and more firm, and to avoid the displacement movement between the upper cover plate 8 and the middle cover plate 9, for example, the upper cover plate 8 and the middle cover plate 9 are designed as an integral molding, and a specific implementation process is not described herein.
Specifically, in order to facilitate the use and installation of the upper cover plate 8 and the middle cover plate 9, for example, the middle cover plate 9 may be a ring-shaped solid of revolution structure having protruding plates protruding in the same direction near the inner ring edge and the outer ring edge, respectively, and the middle cover plate 9 is connected to the lower surface of the upper cover plate 8 by the ends of the protruding plates, so that the middle cover plate 9 and the lower surface of the upper cover plate 8 constitute the above-mentioned first space.
In the present embodiment, as shown in fig. 1, 2, 3, 4 and 5, since one end of the small diaphragm group 12 is directly connected to the upper cover plate, in order to reduce the impact of the high-pressure gas on the small diaphragm group 12, for example, one end surfaces of the large diaphragm group 11 and the small diaphragm group 12, which are far from the lower cover plate 10, may be designed to be on the same horizontal end surface. For example, an extension may be added on the side of the upper cover plate 8 close to the middle cover plate, such that one end of the extension is connected to the upper cover plate 8 and the other end is connected to the small membrane set 12. For example, the extension 26 is a hollow cylinder structure, and the length along the channel axis direction is equal to the length of the convex plate near the inner ring edge (i.e. the end faces of the large diaphragm group 11 and the small diaphragm group 12 far from the lower cover plate 10 are designed to be on the same horizontal end face).
In addition, in order to further reduce the impact of the high pressure gas on the outer surface of the extension body 26, for example, a thickened plate 27 with a curved arc is welded on the outer surface of the extension body, one side of the thickened plate is tightly attached to the extension body, and the thickened plate is connected by welding. Through increasing thickened plate 27, can avoid high-pressure gas direct with extend body 26 contact and cause and to extend body surface impact, and then avoid the extension to make the base position excursion appear because of taking place deformation to influence the normal use of base. Furthermore, in order to further adjust the high-pressure gas, for example, a plurality of uniform concave portions are arranged on the surface of one side, away from the extension body, of the thickened plate, the high-pressure gas rebounds after contacting the concave portions, the contact area of the bulletproof gas and the gas entering subsequently is increased, and the impact force of the high-pressure gas is neutralized, so that the impact of the high-pressure gas on the surface of the lower cover plate 10 is effectively relieved, the lower cover plate 10 is effectively protected, the lower cover plate 10 is prevented from deforming, and the normal work of the valve body is ensured.
As shown in fig. 1, 2, 3 and 4, it is noted that, for the convenience of air intake and exhaust to the diaphragm assembly, for example, the side of the middle cover plate 9 away from the center of the housing 1 (e.g., the outer side plate of the U-shaped plate away from the center of the housing) is provided with an air intake duct 15 and an air outlet duct 16, respectively. It is further described that, in order to facilitate the flow rate of the control gas, the valve adapts to different control gas pressures, and the adaptability of the valve is enhanced, for example, the air inlet pipeline 15 and the air outlet pipeline 16 may be provided with adjusting orifice plates 19 (the adjusting orifice plates may be in a structure with orifices on a circular plate), and the number of orifices on the adjusting orifice plates provided on the air inlet pipeline and the air outlet pipeline may be different. For example, the number of the pore passages on the regulating pore plate at the air inlet pipeline end is larger than that of the pore passages on the regulating pore plate at the air outlet pipeline end, so that the gas flow can be conveniently controlled, and the expansion speed of the membrane box assembly can be further controlled.
In addition, in the practical application process, in order to conveniently control the time sequence and the flow of the gas and ensure the stability of the inner part of the control cavity, for example, the diameters of the pore passages on the regulating pore plates arranged on the gas inlet pipeline 15 and the gas outlet pipeline 16 can be designed to be different. For example, the diameter of the pore passage of the air inlet pipeline 15 is A, the diameter of the pore passage of the air outlet pipeline 16 is B, and a large number of simulation experiments show that when A is not less than 2B and not more than 6B, and gas enters the control cavity, the flow of the gas is convenient to control, the stability of the inner part of the control cavity is ensured, the separation time of the valve seat 4 and the ball body is shortened, and the working efficiency of the valve is improved.
In the present embodiment, in order to ensure stable pressure in the control chamber and shorten the time for gas to enter and exit, for example, the gas inlet line 15 and the gas outlet line 16 may be designed symmetrically with respect to the axis of the medium passage (the line connecting the center lines of the gas inlet line 15 and the gas outlet line 16 is perpendicular to the axis).
In addition, in order to prevent the moist air in the external environment from being sucked back and frozen in the ultra-low temperature environment, an exhaust check valve is installed on the outlet nozzle of the air outlet pipeline 16. Through setting up the check valve, only allow the gas in the pneumatic intracavity to be discharged to the outside by diaphragm capsule subassembly inner chamber, and the passageway that outside air flows to diaphragm capsule subassembly inner chamber is cut off, can avoid humid air suck-back under the super low temperature environment to freeze in the external environment, and then prevents that the diaphragm capsule subassembly diaphragm is broken to the ice-cube when the diaphragm capsule subassembly is flexible, improves product reliability.
In the present embodiment, each of the small diaphragm group 12 and the large diaphragm group 11 is formed of a plurality of uniformly designed metal plates with circular holes, the inner side of the small diaphragm group 12 is close to the outer surface of the valve seat 4, the outer side is disposed opposite to the inner side of the large diaphragm group 11, and the outer side of the large diaphragm group 11 is in contact with the inner surface of the fixed cover 6. In the present embodiment, the metal plates that are close to each other are sequentially connected end to end, and the inner and outer sides are zigzag, so that the diaphragm group can be extended and retracted in the axial direction, and the lower cover plate moves along with the extension and retraction of the metal plates, thereby completing the movement of the valve seat. In practical applications, the small diaphragm set 12 and the large diaphragm set 11 may be formed by bellows instead, and the process will not be described here. In addition, the metal plate is made into a circular diaphragm by punching, and the large diaphragm group is composed of a plurality of circular diaphragms with large diameters, and the small diaphragm is composed of a plurality of circular diaphragms with small diameters.
In order to improve the sealing and reduce the damage caused by the contact between the valve seat 4 and the ball 2, for example, a sealing ring 18 is added at the joint of the valve seat 4 and the ball 2. In order to avoid the movement of the sealing ring, for example, a groove 17 is circumferentially formed on the surface of the valve seat on the side close to the ball, and a sealing ring 18 is arranged in the groove 17, so that the groove 17 can limit the movement of the sealing ring 18, thereby improving the sealing effect.
In addition, in order to ensure that the elastic force of the elastic member 7 is stably applied to the lower cover 10 and reduce the deviation and loss of the elastic force, for example, a concave portion is provided on the fixing cover 6 toward the upper cover side. The concave portion of the fixing cover 6 is used for fixing the elastic member 7. The lower concave part of the fixed cover 6 plays a role in guiding and limiting. One end of the elastic piece 7 is arranged in the lower concave part, the other end of the elastic piece is connected with the lower cover plate 10, when the pneumatic control cavity is not ventilated, the elastic piece 7 applies elastic force to the lower cover plate 10, the lower cover plate 10 transmits the received elastic force to the valve seat 4, and the valve seat 4 is tightly sealed with the end face of the ball body 2. The fixing cover of the embodiment of the application is provided with the lower concave part, so that the elastic piece 7 can move along the inner wall of the lower concave part, and the elastic loss and possible radial deviation in the axial direction are reduced. For example, the elastic member 7 may be a spring.
It should be noted that the fixing cover 6 is used to fix the diaphragm assembly in the housing 1 in cooperation with the housing, and in order to make the connection between the fixing cover 6 and the housing 1 more tight, for example, bolts may be used for fixing the fixing cover 6 and the housing 1. A first sealing gasket 24 is arranged between the fixed cover 6 and the shell 1, so that the sealing effect is improved, and the effect of preventing liquid media from leaking is achieved.
The driving device 3 comprises a rotating shaft 20 and a driver 21, the rotating shaft 20 is driven to rotate by the driver 21, and one end of the rotating shaft 20 is connected with the ball body 2 and used for driving the ball body 2 to rotate, so that the medium channel is opened and closed.
As shown in fig. 1, for convenience of installation and rotation of the ball, a housing 1 may be provided with a symmetrical opening (the center lines of the symmetrical opening are coincident with each other and perpendicular to the axis) and an outer end cap 23, and the housing at the opening end is respectively provided with a first bearing 22 and a second bearing, such that a convex pillar (the convex pillar has a cylindrical structure and is an arc surface with a connection portion on the surface of the ball) located at a side of the ball away from the driving device penetrates through the first bearing 22, a rotating shaft 20 on the driving device 3 penetrates through the second bearing (the surface of the ball is provided with a concave portion, one end of the rotating shaft 20 is embedded into the concave portion, such that when the driver 21 drives the rotating shaft 20 to rotate, the ball rotates, the concave portion may be rectangular, triangular, and the like, and the end of the rotating shaft 20 embedded into the concave portion is matched with the concave portion, the, on the other hand, the ball body can freely rotate along with the bearing. The outer end cover 23 is used for sealing an opening on one side of the convex column and is fixed with the shell through a bolt, and in order to ensure the internal sealing of the shell and reduce the leakage of a liquid medium, a second sealing gasket 25 is arranged between the outer end cover 23 and the shell 1 on the opening.
The foregoing is merely an illustrative embodiment of the present invention, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principle of the present invention should fall within the protection scope of the present invention.
Claims (10)
1. A ball valve device for a liquid rocket engine is characterized by comprising a shell, a ball body, a driving device, a valve seat, a diaphragm capsule assembly and a fixed cover, wherein,
a channel for liquid medium to circulate is arranged in the shell, the ball body is driven to rotate by the driving device, so that the channel body on the ball body and the channel are mutually communicated or closed, and the circulation or the stop of the liquid medium is realized;
the valve seat, the diaphragm capsule assembly and the fixed cover are positioned at the medium inlet end of the shell, and the valve seat is nested at the inner side of the diaphragm capsule assembly and used for realizing the sealing of a medium channel by contacting the ball body; the outer side of the diaphragm box assembly is fixedly connected with the shell, the diaphragm box assembly is provided with a pneumatic control cavity and a diaphragm structure, and the diaphragm structure is communicated with the pneumatic control cavity;
an elastic component is arranged between the fixed cover and the diaphragm capsule component, and applies elasticity to the diaphragm capsule component to enable the valve seat and the ball body to be sealed with each other;
before the liquid medium circulates, the pneumatic control cavity is ventilated, so that the diaphragm structure in the diaphragm box assembly expands to overcome the elasticity of the elastic component and drive the valve seat to be separated from the ball body.
2. The ball valve apparatus for a liquid rocket engine of claim 1, wherein the diaphragm capsule assembly comprises an upper cover plate, a middle cover plate, a lower cover plate, and the diaphragm structure comprising a large diaphragm set and a small diaphragm set, wherein,
the upper cover plate and the middle cover plate are connected with each other to form a first space, the axis ends, close to the channel, of the upper cover plate and the middle cover plate are respectively connected with the small diaphragm group and the large diaphragm group, the other ends of the small diaphragm group and the large diaphragm group are respectively connected with the upper surface of the lower cover plate, the small diaphragm group, the large diaphragm group and the lower cover plate form a second space, and the first space and the second space form a pneumatic control cavity communicated with each other.
3. A ball valve assembly for a liquid rocket engine as recited in claim 2, wherein a support platform is provided on a side of said upper plate adjacent to said ball for guiding said valve seat when moving toward said stationary cover, and said valve seat is connected to said lower plate adjacent to said stationary cover, and gas passes through said first and second spaces and acts on said lower plate to move said valve seat to separate said valve seat from said ball.
4. A ball valve apparatus for a liquid rocket engine according to claim 2, wherein said upper cover plate is provided with a boss portion for connection with said housing on an outer side away from an axis of said passage, said boss portion being of a cylindrical structure facing away from said lower cover plate side and communicating at both ends.
5. A ball valve apparatus for a liquid rocket engine according to claim 2, wherein said upper plate and said mid-plate are integrally formed.
6. The ball valve apparatus for a liquid rocket engine according to claim 5,
the middle cover plate is of an annular rotary body structure, protruding plates protruding in the same direction are arranged on the middle cover plate close to the inner ring edge and the outer ring edge, the middle cover plate is connected with the lower surface of the upper cover plate through the end portions of the protruding plates, and therefore the middle cover plate and the lower surface of the upper cover plate form the first space.
7. The ball valve device for a liquid rocket engine according to claim 2, wherein an inlet pipe and an outlet pipe are respectively provided on the side of the central cover plate away from the axis of the passage, and the inlet pipe and the outlet pipe are symmetrically designed with respect to the axis.
8. The ball valve device for a liquid rocket engine according to claim 2, wherein the large diaphragm set is composed of a plurality of metal plates with large apertures, the small diaphragm set is composed of a plurality of metal plates with small apertures, the inner side of the small diaphragm set is close to the outer surface of the valve seat, the outer side of the small diaphragm set is opposite to the inner side of the large diaphragm set, the outer side of the large diaphragm set is abutted to the inner surface of the fixed cover, and the metal plates with large apertures and the metal plates with small apertures are sequentially connected end to end respectively, so that the inner side and the outer side of the large diaphragm set and the inner side of the small diaphragm set are zigzag, and the diaphragm assembly is ensured to be telescopic along the axial direction.
9. A ball valve apparatus for a liquid rocket engine as recited in claim 1, wherein a surface of said valve seat on a side adjacent to said ball is circumferentially recessed, and a sealing ring is disposed in said recess.
10. A ball valve apparatus for a liquid rocket engine according to claim 1, wherein said elastic member is a spring, and said fixing cap is provided with a lower recess for fixing said spring.
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| CN202110162467.6A CN112984146B (en) | 2021-02-05 | 2021-02-05 | Ball valve device for liquid rocket engine |
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| CN202110162467.6A CN112984146B (en) | 2021-02-05 | 2021-02-05 | Ball valve device for liquid rocket engine |
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|---|---|
| CN112984146B (en) | 2023-01-13 |
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Effective date of registration: 20230105 Address after: 26-5, Building 112, Lane 600, Tangming Road, Shihudang Town, Songjiang District, Shanghai, 201600 Applicant after: Shanghai Lanjian Hongqing Technology Co.,Ltd. Address before: 710077 East Building, four floor, aerospace science and technology, civil and integration innovation center, 32 United South Road, Xi'an, Shaanxi Applicant before: SHAANXI LANDSPACE TECHNOLOGY Co.,Ltd. Applicant before: Blue Arrow Space Technology Co.,Ltd. Applicant before: Zhejiang blue arrow Space Technology Co.,Ltd. |
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