CN114215943A - Ultralow temperature check valve - Google Patents

Ultralow temperature check valve Download PDF

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Publication number
CN114215943A
CN114215943A CN202210042568.4A CN202210042568A CN114215943A CN 114215943 A CN114215943 A CN 114215943A CN 202210042568 A CN202210042568 A CN 202210042568A CN 114215943 A CN114215943 A CN 114215943A
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CN
China
Prior art keywords
cavity
valve
valve body
outlet
inlet
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Application number
CN202210042568.4A
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Chinese (zh)
Inventor
刘百奇
朱汉银
刘建设
赵昶
朱乔峰
李作为
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Xinghe Power Equipment Technology Co Ltd
Galactic Energy Beijing Space Technology Co Ltd
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Beijing Xinghe Power Equipment Technology Co Ltd
Galactic Energy Beijing Space Technology Co Ltd
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Publication date
Application filed by Beijing Xinghe Power Equipment Technology Co Ltd, Galactic Energy Beijing Space Technology Co Ltd filed Critical Beijing Xinghe Power Equipment Technology Co Ltd
Priority to CN202210042568.4A priority Critical patent/CN114215943A/en
Publication of CN114215943A publication Critical patent/CN114215943A/en
Pending legal-status Critical Current

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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
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
    • F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
    • F02K9/44—Feeding propellants
    • F02K9/56—Control
    • F02K9/58—Propellant feed valves
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • 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
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Check Valves (AREA)

Abstract

The present invention provides an ultra-low temperature check valve, comprising: the valve comprises an inlet valve body, a valve core, a spring and an outlet valve body, wherein the inlet valve body is provided with an inlet and a first cavity which are communicated, and the outlet valve body is provided with an outlet and a second cavity which are communicated; the outlet valve body is inserted and fixed in the first cavity, and a graphite gasket is arranged between the outlet valve body and the first cavity; the first cavity and the second cavity cooperate to form a moving cavity; the valve core is provided with an annular sealing surface and is formed with a channel, the valve core is movably arranged in the moving cavity, one end of the spring is connected with the channel, the other end of the spring is connected with the second cavity, and the contact end of the inlet valve body, which is in contact with the annular sealing surface, is a flat angle. The invention can be suitable for the ultra-low temperature environment and has simple and reliable structure.

Description

Ultralow temperature check valve
Technical Field
The application relates to the field of liquid rocket engines, in particular to an ultralow-temperature one-way valve.
Background
In a liquid rocket engine system, the medium of a plurality of valves is ultralow temperature medium, such as liquid oxygen-kerosene liquid rocket engine liquid oxygen path blowing one-way valves, and liquid oxygen at the temperature of-196 ℃ can be contacted during working, so that the valves are required to withstand the temperature and meet the normal working and use requirements.
Disclosure of Invention
Aiming at the technical problems, the invention provides the ultralow temperature one-way valve which can resist ultralow temperature, has long service life, high reliability and medium-high pressure, and meets the requirement of a liquid oxygen-kerosene liquid rocket engine on the blowing one-way valve of a liquid oxygen path.
The embodiment of the invention provides an ultralow temperature one-way valve, which comprises: the valve comprises an inlet valve body, a valve core, a spring and an outlet valve body, wherein the inlet valve body is provided with an inlet and a first cavity which are communicated, and the outlet valve body is provided with an outlet and a second cavity which are communicated; the outlet valve body is inserted and fixed in the first cavity, and a graphite gasket is arranged between the outlet valve body and the first cavity; the first cavity and the second cavity cooperate to form a moving cavity; the valve core is provided with an annular sealing surface and is formed with a channel, the valve core is movably arranged in the moving cavity, one end of the spring is connected with the channel, the other end of the spring is connected with the second cavity, and the contact end of the inlet valve body, which is in contact with the annular sealing surface, is a flat angle.
Further, the outlet valve body is connected with the first cavity through threads.
Further, the graphite gasket bears a pressure greater than 100 MPa.
Further, the amount of deformation of the graphite gasket was 30%.
Further, the annular sealing surface is a plastic sealing surface.
Further, the sealing plastic surface is formed by a hot press molding process.
Further, an annular groove is formed in the top of the valve core, and the sealing plastic surface is formed in the annular groove through a hot press molding process.
Further, the valve element is formed through two times of cryogenic treatment.
Further, the first subzero treatment is to carry out subzero treatment on the valve core raw material, and the second subzero treatment is to carry out subzero treatment on the valve core after the sealing plastic surface is formed.
Further, the subzero treatment is to soak the mixture for 4 hours in liquid nitrogen and then to place the mixture for 4 hours at normal temperature.
According to the ultralow-temperature one-way valve provided by the embodiment of the invention, the graphite gasket is adopted for sealing between the inlet valve body and the outlet valve body, the flat angle is adopted for sealing between the inlet valve body and the valve core, and the valve core is subjected to twice cryogenic treatment, so that the ultralow-temperature one-way valve can adapt to an ultralow-temperature environment, and is simpler in structure and lower in weight while ensuring the performance reliability at low temperature.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of an ultra-low temperature check valve provided in an embodiment of the present invention;
fig. 2(a) -2 (c) are schematic views of the preparation of the valve core.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a structural view of an ultra-low temperature check valve according to an embodiment of the present invention. As shown in fig. 1, an ultra-low temperature check valve provided by an embodiment of the present invention includes: inlet valve body 1, valve core 2, spring 4 and outlet valve body 3.
An inlet 101 and a first cavity 102 which are communicated with each other are formed in the inlet valve body 1, an annular contact end 103 is formed at the upper end of the first cavity 102 in a protruding mode, and a step portion 104 is formed at the lower end of the first cavity 102.
The valve element 2 is provided with an annular sealing surface 201 and is formed with a channel 202.
Specifically, the front end of the valve core 2 is provided with an annular sealing surface 201, and the annular sealing surface 201 is used for contacting with the annular contact end 103 of the inlet valve body to realize sealing. In an embodiment of the present invention, the contact surface of the contact end 103 and the annular sealing surface 201 may be a straight angle. In the embodiment of the invention, because of the existence of back pressure, the flat angle is used for sealing, compared with a round angle, the flat angle can increase the sealing width between the valve core and the inlet valve body, the sealing performance can be ensured, the specific sealing pressure can be reduced, and further the working pressure is improved, namely, the plastic surface of the valve core cannot be crushed under a larger working pressure. Through proper specific sealing pressure calculation, the phenomenon that the annular sealing surface is pressed and broken under the medium-high pressure working environment and the problem of internal leakage caused by inconsistency of the annular sealing surface due to frequent opening and closing of the valve can be effectively prevented.
The valve core in the embodiment of the invention has the sealing specific pressure of [ pi (r + w)2/4×P+Fz]/[π(r+2w)2/4]
Wherein r is the small circular diameter of the annular sealing surface; fz is the spring force; w is the width of the straight angle and P is the pressure of the medium.
Further, in the embodiment of the present invention, the annular sealing surface may be a plastic sealing surface, the plastic sealing surface may be made of plastic which is easy to process and has strong thermoplasticity, and preferably, the material of the plastic sealing surface may be a copolymer of tetrafluoroethylene and hexafluoropropylene (F46). As shown in fig. 1, the top of the valve core 2 may be formed with an annular groove in which the sealing plastic surface is formed through a hot press molding process. The cross-section of the annular groove may be a right trapezoid. The width of the upper surface of the annular groove is larger than the width of the flat angle, and may be, for example, 2 times or more the width of the flat angle. The base angle of the right trapezoid may be 15 deg., whereby the width of the lower surface may be derived based on the width of the upper surface.
In the embodiment of the invention, deep cooling treatment can be carried out twice in the machining process of the valve core, and the annular sealing surface can be formed by a hot press molding process in the machining process of the valve core. In an exemplary embodiment, the machining process of the valve core of the embodiment of the present invention may include the steps of:
s100, performing primary subzero treatment on the valve core raw material, wherein the subzero treatment is to soak the valve core raw material in liquid nitrogen for 4 hours and then place the valve core raw material at normal temperature for 4 hours;
and S110, machining the valve core raw material subjected to the first cryogenic treatment to prepare a valve core metal blank, as shown in fig. 2 (a).
And S120, forming an annular sealing surface on the valve core metal blank through a hot press molding process to obtain a valve core blank, as shown in fig. 2 (b).
Specifically, the method comprises the following steps:
(1) manufacturing a hot-pressing tool, wherein the hot-pressing tool comprises a bottom plate and a gland, spraying a release agent, and drying for 30min at 150 ℃;
(2) blowing sand on the valve core metal blank, coating an adhesive, and drying for 30min at 55 ℃;
(3) putting the valve core metal blank processed in the step (2) into a bottom plate of a hot pressing tool, putting a certain amount of plastic particles, and covering a gland of the hot pressing tool;
(4) putting the whole hot-pressed workpiece into a hot press, setting the temperature of an upper press plate and a lower press plate of the hot press to be 360 ℃, setting the demolding temperature to be 40 ℃, gradually melting the plastic when the temperature rises, and preserving the heat for 10min when the temperature of the die rises to 350 ℃;
(5) and (5) cooling. And setting the temperatures of the upper and lower pressing plates, starting to cool the die, preserving the heat for 30min when the temperature is 320 ℃, then continuously cooling, pressurizing the die to a certain pressure when the temperature is reduced to 270 ℃, maintaining the pressure until the temperature reaches the demolding temperature, and finishing the hot pressing of the valve core blank.
And S130, carrying out secondary subzero treatment on the valve core blank.
And S140, machining and forming the valve core blank subjected to the secondary cryogenic treatment into a final valve core, as shown in FIG. 2 (c).
In the embodiment of the invention, because the deep cooling treatment is carried out twice in the machining process of the valve core, the valve core can be ensured not to deform under the ultralow temperature environment (-196 ℃). The valve core material can be stainless steel such as 022Cr17Ni12Mo 2. In addition, in the embodiment of the invention, the sealing plastic is obtained by adopting a hot pressing process, so that the sealing plastic can be bonded with the valve body more firmly, and the sealing plastic is suitable for severe working environments such as vibration, impact and the like.
Further, with continued reference to fig. 1, the channels 202 may include an axial channel formed in the axial direction of the spool and a plurality of inclined channels, e.g., 4 inclined channels, formed in an inclined direction that is inclined to the axial direction. A first step 203 is formed on the axial passage. In one exemplary embodiment, the angled channels may be angled 40 ° from the axial channels.
Further, with continued reference to fig. 1, the outlet valve body 3 has formed therein an outlet 301 and a second chamber 302 communicating therewith. The lower end of the outlet valve body 3 is inserted and fixed in the first cavity 102, a graphite gasket 5 is arranged between the outlet valve body and the first cavity, and the first cavity and the second cavity are matched to form a moving cavity for accommodating the valve core.
In an embodiment of the invention, the lower end of the outlet valve body is threadedly connected to the first chamber 102. The graphite gasket is rotationally extruded by the aid of threads between the inlet valve body 1 and the outlet valve body 3, and about 30% of deformation occurs to achieve external sealing of the valve. The deformation of the graphite gasket can be determined by measuring the distance between the front inlet and outlet valve body end surfaces before and after compression, and is ensured by the design size of the product. The pressure born by the graphite gasket is more than 100MPa, and the pressure born by the graphite gasket can be determined by the following modes: firstly, calculating the torque of the connecting threads of the inlet valve body and the outlet valve body under 100MPa, and detecting the torque by adopting a torque wrench during screwing. The thickness and the diameter of the graphite gasket can be determined according to national standard specifications and the structural size of the inlet and outlet valve bodies of the one-way valve. The position of the graphite gasket can be determined according to the structural size of the inlet and outlet valve bodies of the one-way valve.
In the embodiment of the invention, under the action of the required tightening torque, the connecting threads of the inlet valve body and the outlet valve body meet the bending strength, the shearing strength and the wear-resisting strength of the root parts of the threads, so that the reliability of threaded connection is ensured, and the working reliability and the sealing performance of the valve are further ensured.
In the embodiment of the invention, the shear strength of the root of the thread
Figure BDA0003470913620000051
Wherein F is the tensile force applied to the thread, generally the area obtained by multiplying the medium pressure by the nominal diameter of the thread; d1 is the major diameter of the thread, b is the thickness of the root of the thread; z is the number of turns of the thread.
Flexural strength of thread root
Figure BDA0003470913620000052
h is the working height of the thread.
When screwing down, the wear resistance of the thread is checked, and the pressure on the working surface of the thread
Figure BDA0003470913620000053
Wherein d is the pitch diameter of the thread, H is the screwing length, and p is the maximum pressure applied to the thread, which is the maximum of the inlet pressure and the outlet pressure.
With continued reference to fig. 1, the spool 2 is movably disposed in the displacement chamber, and the surface of the second chamber of the outlet valve body 3 serves as the lead of the reciprocating motion of the spool. The front end of the second chamber of the valve body is formed with an annular inclined surface 303 to facilitate the discharge of gas through the inclined passage. One end of the spring 4 is connected to the channel and the other end is connected to the second chamber 302 to provide a force for the valve core to compress the inlet valve body. Specifically, a second step portion 304 is formed in the second cavity of the valve body, one end of the spring is clamped on the first step portion 203, and the other end of the spring is clamped on the second step portion 304, so that positioning is achieved. In an exemplary embodiment, the first step portion and the second step portion may have grooves formed thereon, and both ends of the spring are respectively caught in the corresponding grooves for better positioning.
The ultralow-temperature one-way valve provided by the embodiment of the invention can be suitable for any hydraulic system and pneumatic system. In a specific application scene, the device can be used for blowing off the liquid oxygen pipeline of the liquid oxygen kerosene engine, wherein an inlet on the inlet valve body is connected with a blowing air source, and an outlet of the outlet valve body is communicated with the liquid oxygen pipeline through a pipeline. When in use, two ends of the one-way valve are connected with the pipeline through the pipe connecting nozzle. The opening pressure of the ultralow temperature one-way valve provided by the embodiment of the invention is controlled by the spring 4, when the pressure difference between the inlet and the outlet, namely the pressure difference obtained by subtracting the outlet pressure from the inlet pressure does not reach the set opening pressure difference, the valve core 2 presses a flat angle on the inlet valve body 1 by the sealing plastic surface of the valve core 2 under the action of the acting force of the spring 4 and the outlet back pressure, and the valve is closed and sealed at the moment. Along with the rise of the inlet pressure, when the pressure difference between the two ends of the inlet and the outlet reaches the set opening pressure difference, the acting force acting on the valve core overcomes the acting force of the spring 4 and the outlet back pressure, so that the valve core moves rightwards, the valve is opened, and the circulation of the gas medium is realized. Therefore, the medium can only enter from the inlet and flow out from the outlet, but can not flow reversely.
Although some specific embodiments of the present application have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the present application. It will also be appreciated by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims (10)

1. An ultra-low temperature check valve, comprising: the valve comprises an inlet valve body, a valve core, a spring and an outlet valve body, wherein the inlet valve body is provided with an inlet and a first cavity which are communicated, and the outlet valve body is provided with an outlet and a second cavity which are communicated; the outlet valve body is inserted and fixed in the first cavity, and a graphite gasket is arranged between the outlet valve body and the first cavity; the first cavity and the second cavity cooperate to form a moving cavity; the valve core is provided with an annular sealing surface and is formed with a channel, the valve core is movably arranged in the moving cavity, one end of the spring is connected with the channel, the other end of the spring is connected with the second cavity, and the contact end of the inlet valve body, which is in contact with the annular sealing surface, is a flat angle.
2. The one-way valve of claim 1, wherein the outlet valve body and the first chamber are threadably connected.
3. The check valve of claim 2, wherein the graphite washer is subjected to a pressure greater than 100 MPa.
4. The check valve of claim 1, wherein the graphite washer has a deflection of 30%.
5. The check valve of claim 1 wherein said annular sealing surface is a plastic sealing surface.
6. The one-way valve of claim 5, wherein the sealing plastic face is formed by a hot press molding process.
7. The check valve of claim 5, wherein the top of the valve core is formed with an annular groove, and the sealing plastic surface is formed in the annular groove by a hot press molding process.
8. The check valve of claim 6, wherein the spool is formed by two cryogenic processes.
9. The check valve of claim 8, wherein the first cryogenic treatment is cryogenic treatment of the raw material of the valve spool, and the second cryogenic treatment is cryogenic treatment of the valve spool after the sealing plastic surface is formed.
10. The check valve of claim 8, wherein said cryogenic treatment is a 4h soak in liquid nitrogen for 4h followed by a 4h room temperature soak.
CN202210042568.4A 2022-01-14 2022-01-14 Ultralow temperature check valve Pending CN114215943A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210042568.4A CN114215943A (en) 2022-01-14 2022-01-14 Ultralow temperature check valve

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Application Number Priority Date Filing Date Title
CN202210042568.4A CN114215943A (en) 2022-01-14 2022-01-14 Ultralow temperature check valve

Publications (1)

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CN114215943A true CN114215943A (en) 2022-03-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114856861A (en) * 2022-04-27 2022-08-05 西安航天动力研究所 Hard sealing safety valve of resistance mechanical impact floating valve seat

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114856861A (en) * 2022-04-27 2022-08-05 西安航天动力研究所 Hard sealing safety valve of resistance mechanical impact floating valve seat
CN114856861B (en) * 2022-04-27 2024-02-09 西安航天动力研究所 Hard sealing safety valve for preventing mechanical impact on floating valve seat

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