Low-temperature anti-flutter one-way valve and liquid oxygen methane engine

Abstract

The utility model provides a low-temperature anti-flutter one-way valve and a liquid oxygen methane engine. The low-temperature anti-flutter one-way valve at least comprises a shell and a blanking cap installed at the inlet end of the shell, and the blanking cap is axially provided with an opening communicated with the interior of the shell. The end, away from the plug, of the shell is an outlet, a sealing boss is arranged on the inner wall of the side, close to the outlet, of the shell, a first space is formed between the sealing boss and the plug, and the inner diameter of the side, close to the inlet, of the first space is larger than that of the other side. The valve element assembly is movably arranged in the first space, and an air hole communicating with the inlet and the outlet is formed in the valve element assembly. The outer wall of the first side of the valve element assembly is provided with a first outer diameter part and a second outer diameter part which are matched with the first space, and the first outer diameter is larger than the second outer diameter; the end of the second side of the valve element assembly is located at the outlet and matched with the sealing end face of the sealing boss. One end of the elastic piece is installed on the side, close to the inlet, of the valve element assembly, and the other end is used for being matched with the back face of the sealing end face of the sealing boss to generate acting force towards the inlet on the valve element assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to space launch vehicle technical field, especially low temperature anti-chattering one-way valve and liquid oxygen methane engine. BACKGROUND

[0002] The one-way valve is an important component of the self-generating pressurization delivery system of the launch vehicle engine and plays an important role in the pressurization path. During performance testing, the one-way valve has occurred chattering phenomenon for many times. Especially when the engine works at low operating conditions, the medium flow is small, and the inlet and outlet pressure is low, so it is more likely to produce chattering problem, which affects the normal work of the system, and may even cause the valve itself to fail.

[0003] At present, there are several improved structures for the one-way valve chattering problem, such as adding a bushing to the valve core, using a stainless steel spring ring or a corrugated belt ring to increase the damping structure to avoid chattering. However, these methods have many problems, for example, using a bushing and a stainless steel spring ring is easy to produce excess or jam, and using a corrugated belt ring has unstable damping effect at room temperature and low temperature.

[0004] Therefore, it is urgent to provide a one-way valve that can be used in a low-temperature environment, avoid chattering of the valve body during operation, and improve the working performance and reliability of the valve. SUMMARY

[0005] To solve the above technical problems, the utility model provides a low-temperature anti-chattering one-way valve and a liquid oxygen methane engine. By setting an unbalanced area on the inlet side, the one-way valve is sensitive to pressure but not sensitive to pressure difference, ensuring stable performance after the valve is opened and solving the chattering problem when the flow is reduced, avoiding chattering wear that causes valve jam and brings excess to the downstream system.

[0006] The utility model discloses low temperature anti-chatter one-way valve on one side provides at least including bung, shell, valve core subassembly and elastic part, bung, shell, valve core subassembly and elastic part, the bung is installed in the shell entrance one end, and its axial direction is equipped with the opening with the shell inside intercommunication, the shell is away from the bung one end for the export, and the shell is close to the export one side inner wall and is provided with sealing boss, and the sealing boss and the bung between form first space, and the first space is close to the inner diameter of one side of the entrance greater than the inner diameter of the other side, the valve core subassembly movably be provided with in first space, and its inside is equipped with the air hole with the entrance and the export intercommunication, the outer wall of valve core subassembly first side has with first space big inner diameter cooperation's first outer diameter portion and with small inner diameter cooperation's second outer diameter portion, and the first outer diameter is greater than the second outer diameter, the end of valve core subassembly second side is located in the export and is with the sealing end surface cooperation of sealing boss, and one end of elastic part is installed in the valve core subassembly close to the one side of entrance, and the other end is used for with the back surface cooperation of sealing end surface of sealing boss to produce the force of the valve core subassembly to the entrance direction.

[0007] In one embodiment, the valve core subassembly includes a sleeve and a valve core; the outer wall of the sleeve is adapted to the inner diameter variation of the first space and movably arranged in the first space, the inside of the sleeve is provided with a first air hole for the medium to pass through, and after the valve is opened, the first air hole is in communication with the inlet and the outlet; the sleeve is axially provided with a spring mounting hole, and the side of the elastic member away from the sealing boss is arranged in the spring mounting hole; one side of the valve core is arranged in the sleeve and fixedly connected with the inner wall of the sleeve, and the end of the other side is located in the outlet and matched with the sealing end surface of the sealing boss.

[0008] In one embodiment, a first sealing member is arranged between the sleeve and the shell; a second sealing member is arranged on the end surface of the valve core matched with the sealing boss; wherein the first sealing member is a dynamic seal, and the second sealing member is a static seal.

[0009] In one embodiment, the first sealing member includes a first sealing ring arranged between the small inner diameter portion of the shell and the sleeve, and a second sealing ring arranged between the large inner diameter portion of the shell and the sleeve; the diameter of the first sealing ring is smaller than the diameter of the second sealing ring.

[0010] In one embodiment, the valve core subassembly further includes a gland fixedly arranged on the side of the valve core close to the inlet; one side of the gland axially presses the second sealing ring between the shell and the sleeve, and the other side is matched with the bung; the gland is provided with a second air hole communicating the inlet and the first air hole.

[0011] In one embodiment, the sleeve is provided with a retaining ring defining the first sealing ring near the outer wall of the outlet side.

[0012] In one embodiment, at least one annular groove is provided on the outer wall of the sleeve between the first sealing ring and the second sealing ring, and a non-metallic support ring is arranged in the annular groove.

[0013] In any one of the above embodiments, an exhaust port is radially provided at the position where the housing transitions from the large inner diameter portion to the small inner diameter portion.

[0014] In one embodiment, the plug is threadedly connected with the housing, and a third sealing member is arranged at the connection; the third sealing member is arranged as a static seal.

[0015] The utility model discloses a liquid oxygen methane engine on the other side at least includes the low temperature anti-chatter check valve of any one of the above embodiment.

[0016] The low temperature anti-chatter check valve and the liquid oxygen methane engine provided by the utility model solve the chattering problem caused by the reduced flow after the valve is opened, thereby ensuring the stable performance of the product, increasing the stability of the product itself and the use system. The low temperature anti-chatter check valve of the utility model has simple structure and reliable performance, the non-metallic support ring is arranged at the suitable position near the spring energy storage sealing ring, the service life and the sealing performance of the spring energy storage sealing ring are increased, the low temperature sticking problem is solved, and the check valve of the utility model can be applied to normal temperature and low temperature environment.

[0017] The low temperature anti-chatter check valve and the liquid oxygen methane engine provided by the utility model use the ultralow temperature metal or non-metallic spring energy storage sealing ring to realize dynamic sealing under the ultralow temperature environment, reduce the friction, and ensure the sealing performance of the product.

[0018] After reading the specific embodiments and after viewing the drawings, those skilled in the art will realize additional features and advantages. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0020] Figure 1 It is the structure diagram of the low temperature anti-chatter check valve of the utility model embodiment.

[0021] Figure 2 It is the whole structure schematic view of the low temperature anti-chatter check valve of the utility model embodiment. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present application clearer, the features and exemplary embodiments of each aspect of the present application will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely configured to explain the present application and serve as exemplary description of the principles of the present application, and are not configured to limit the present application. In addition, the components in the drawings are not necessarily drawn to scale. For example, the size of some components in the drawings can be enlarged for other components or areas to help understand the embodiments of the present application.

[0023] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the embodiments of the present application. In the description of the present application, it should be noted that, unless otherwise specified, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In addition, the terms "including", "containing", "having" or any other variant thereof are intended to cover non-exclusive inclusion, so that the inclusion of a series of element structures or components not only includes those elements, but also includes other elements not explicitly listed or inherent to the structure, component. Without more limitations, the elements defined by the statement "including" do not exclude the presence of other identical elements in the article or device including the elements.

[0025] Spatial relationship terms such as "below", "under", "lower", "above", "upper", "on", "higher" are used to facilitate description and explanation of the positioning of one element relative to a second element, and are intended to cover different orientations of the device in addition to those shown in the drawings. In addition, for example, "one element is on / under another element" can mean that the two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second" are also used to describe various elements, regions, parts, etc., and should not be considered as limiting. Similar terms are used throughout the description to represent similar elements.

[0026] For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by showing examples of the present application.

[0027] Referring to Figure 1 The utility model discloses a low-temperature anti-chattering one-way valve, at least includes: the bung 1, the shell 2, the valve element assembly 3 and the elastic part 4. The bung 1 is installed in the shell entrance A one end, its axial direction is equipped with the opening with the shell 2 inside communication, and the shell 2 is away from the bung 1 one end as the outlet B. The shell 2 is set up the sealing boss 9 in the inner wall of one side close to the outlet B, and the sealing boss 9 forms the first space with the bung 1, and the inner diameter of the first space close to the entrance A one side is greater than the inner diameter of the other side, and the valve element assembly 3 and the elastic part 4 are set up in the first space. Wherein, the valve element assembly 3 is movably set up in the first space, and the inside of valve element assembly 3 is equipped with the air hole for with the entrance A and the outlet B communication. The outer wall of the first side of valve element assembly 3 has the first outer diameter portion with the cooperation of the first space big inner diameter and the second outer diameter portion with the cooperation of small inner diameter, and the first outer diameter is greater than the second outer diameter, to realize the first end surface area of valve element assembly 3 towards the entrance A side greater than the second end surface area of the other side. The end of the second side of valve element assembly 3 is located in the outlet B and cooperates with the sealing end face (the end face close to the outlet B side) of sealing boss 9 to realize the opening and closing of valve.

[0028] The elastic part 4 one end is installed in the one side of valve element assembly 3 close to the entrance A, and the other end is used for cooperating with the back of sealing end face (the end face close to the entrance A) to produce the force of the valve element assembly 3 to the entrance A direction to the valve element assembly 3, so that the end of the other side of valve element assembly 3 is sealed to the sealing end face of sealing boss 9 and seals the outlet B.

[0029] When filling medium in the valve through the entrance A side, the medium impacts the first end surface of valve element assembly 3, and the valve element assembly 3 is subjected to the force towards the outlet B side. Valve element assembly 3 exerts the force towards the outlet B side to the elastic part 4, and the elastic part 4 deforms, so that valve element assembly 3 moves to the outlet B side, and the sealing of the outlet B is released. The inside of valve element assembly 3 is provided with the air hole for with the entrance A and the outlet B communication, and after the outlet of the valve is opened, the medium enters from the entrance A in turn, and is discharged by the outlet B after passing through the air hole of valve element assembly 3.

[0030] In view of the force area of the first end surface of valve element assembly 3 greater than the force area of the second end surface, the resultant force of valve element assembly 3 can be guaranteed to be towards the outlet B direction in the opening period. The valve element guarantees the resultant force F (F=(D1 2 -D2 2) is always greater than the elastic force of the elastic member, wherein D1 is the large inner diameter of the first space (which can also be regarded as the outer diameter of the first end surface of the valve core assembly 3), and D2 is the small inner diameter of the first space (which can also be regarded as the outer diameter of the second end surface of the valve core assembly 3). After the valve is opened, when the medium entering the inlet A is reduced, the valve core assembly 3 is still subjected to a force towards the outlet B, which at least partially offsets the force of the elastic member 4 on the valve core assembly 3, thereby reducing the flutter of the valve core assembly, solving the flutter problem of the valve under small flow and small pressure difference, and ensuring the stable performance of the valve after opening.

[0031] In the above embodiment, the position where the large inner diameter part and the small inner diameter part of the first space transition is provided as a stepped transition, which is used to limit the movement range of the valve core assembly 3.

[0032] The low-temperature anti-flutter check valve of the embodiment is applied to a liquid oxygen or methane path, and the valve can realize the functions of opening in the forward direction and closing in the reverse direction under normal temperature, low temperature, low pressure, medium pressure and high pressure. The valve ensures no flutter under large and small flow by setting an unbalanced area, solves the flutter problem caused by large change in flow range of the check valve under low temperature, protects the performance of the product itself, and improves the reliability of the product and system under a reusable environment.

[0033] Meanwhile, referring to Figure 1 and Figure 2 , in one embodiment, the valve core assembly 3 includes a sleeve 31 and a valve core 32. The outer wall of the sleeve 31 is adapted to the change in the inner diameter of the first space and is movably arranged in the first space, and the inside of the sleeve 31 is provided with a first gas hole for the medium to pass through. After the valve is opened, the first gas hole is in communication with the inlet A and the outlet B. That is, the outer wall of the sleeve 31 has a large outer diameter part matched with the large inner diameter part of the housing 2, and a small outer diameter part matched with the small inner diameter part of the housing 2.

[0034] The sleeve 31 is axially provided with a spring mounting hole and a valve core mounting hole, and the spring mounting hole is arranged outside the valve core mounting hole. One side of the elastic member 4 is arranged in the spring mounting hole, and the other end thereof abuts against the end surface of the sealing boss 9 towards the inlet A side. One side of the valve core 32 is arranged in the valve core mounting hole of the sleeve 31 and fixedly connected with the inner wall of the sleeve, and the other end thereof is located in the outlet B and cooperates with the sealing end surface (end surface towards the outlet B side) of the sealing boss 9.

[0035] Wherein, the elastic member 4 is compressed by the sealing boss 9 and installed in the spring installation hole, the elastic force is applied to the sleeve 31 by the elastic member 4 and transmitted to the valve core 32, so that the sealing end face of the sealing boss 9 is pressed by the end of the valve core 32 at the outlet B, thereby realizing the closing of the valve. When the medium is introduced into the valve through the inlet A, the pressure of the medium pushes the sleeve 31 and the valve core 32 to overcome the elastic force of the elastic member 4, drives the sleeve 31 and the valve core 32 to move towards the outlet B at the same time, so that the sealing end of the valve core 32 is away from the sealing end face of the sealing boss 9, and the opening of the valve is realized. After the valve is opened, the medium enters the downstream equipment in sequence through the inlet A, the first gas hole and the outlet B. Since the end face area of the sleeve 31 located in the large diameter part of the first space is larger than the end face area located in the small diameter part, even if the flow of the medium becomes small, the sleeve 31 is still subjected to the pressure towards the outlet B, which at least partially offsets the elastic force of the elastic member 4, so that the flutter of the valve core 32 can be effectively avoided, the small flow flutter problem is solved, the stability of the product performance is ensured, and the stability of the product itself and the use system is increased.

[0036] Continuing to refer to Figure 1 and Figure 2 Further, in order to increase the sealing performance of the valve, a first sealing member 5 can be arranged between the housing 2 and the sleeve 31. A second sealing member 6 is arranged on the end face of the valve core 32 for cooperating with the sealing boss 9. A third sealing member 7 is arranged at the connection between the plug cover 1 and the housing 2. The first sealing member 5 is dynamic sealing, and the second sealing member 6 and the third sealing member 7 are static sealing.

[0037] The first sealing member 5 comprises a first sealing ring 51 arranged between the small diameter part of the housing and the sleeve 31, and a second sealing ring 52 arranged between the large diameter part of the housing and the sleeve 31. The diameter of the first sealing ring 51 is smaller than the diameter of the second sealing ring 52. The first sealing ring 51 and the second sealing ring 52 are both ultra-low temperature metal or non-metal spring energy storage sealing rings, which realize dynamic sealing in the ultra-low temperature environment, replace the conventional packing seal, reduce the friction and improve the sealing performance of the product.

[0038] In addition, the end face of the valve core 32 for cooperating with the sealing boss 9 is provided with a groove for installing the second sealing member 6, and the second sealing member 6 is a third sealing ring installed in the groove. The plug cover 1 and the housing 2 are connected by threads, and the connection part is arranged as a step matched with each other. The third sealing member 7 is a fourth sealing ring pressed and fixed by the step. The third sealing ring and the fourth sealing ring can be selected from non-metal gaskets, metal gaskets or spring energy storage sealing rings.

[0039] Continuing to refer to Figure 1 and Figure 2In the above embodiments, the valve core assembly 3 further comprises a gland 33 fixedly arranged on the valve core 32 near the inlet side. The gland 33 axially presses the second sealing ring 52 between the housing 2 and the sleeve 31, and matches the plug 1 on the other side. The end surface area of the sleeve 31 matching the plug 1 is larger than the end surface area of the sleeve 31 located in the small inner diameter part of the first space. That is, the gland 33, the outer wall of the sleeve 31 and the inner wall of the housing 2 cooperate to press the second sealing ring 52. The gland 33 is provided with a second gas hole communicating with the inlet A and the first gas hole. After the valve is opened, the medium passes through the inlet A, the first gas hole, the second gas hole and the outlet B in sequence.

[0040] In the present embodiment, in the closed state of the valve, the side part of the gland 33 near the inlet A is pressed against the plug 1. When the medium is introduced into the inlet A, the medium is applied to the side of the gland 33 near the inlet A. The medium pressure pushes the gland 33 to drive the sleeve 31 and the valve core 32 to move away from the inlet A, overcoming the elastic force of the elastic member, and releases the sealing of the sealing end surface of the sealing boss 9, so that the valve is opened. During the movement, the gland 33 gradually moves away from the plug 1, so that the end surface of the gland 33 on the side of the inlet A is completely in contact with the medium and bears the pressure of the medium.

[0041] In any of the above embodiments, in order to ensure smooth flow of the medium, 1-8 gas holes can be matched on the sleeve and the gland.

[0042] Referring to Figure 1 and Figure 2 In one embodiment, the outer wall of the sleeve near the outlet B side is provided with a retainer ring 53 for limiting the first sealing ring 51. The retainer ring 53, the outer wall of the sleeve 31 and the inner wall of the housing 2 cooperate to press the first sealing ring 51, and the retainer ring 53 is used to prevent the first sealing ring 51 from coming off along the sleeve 31 near the outlet B side. In the present embodiment, the retainer ring 53 is fixed to the outer wall of the sleeve 31 by using the intermediate steel wire 54, instead of the traditional threaded connection, which reduces the product size and simplifies the installation process.

[0043] Further, in order to improve the service life of the dynamic seal, at least one annular groove is arranged on the outer wall of the sleeve 31 between the first sealing ring 51 and the second sealing ring 52 in the present embodiment, and a non-metallic support ring is installed in the annular groove, which can move along the inner wall of the housing 1. For example, two annular grooves can be arranged on the outer wall of the sleeve 31 between the first sealing ring 51 and the second sealing ring 52, the first annular groove is arranged on the small outer diameter part of the sleeve 31, and the second annular groove is arranged on the large outer diameter part of the sleeve 31. A first non-metallic support ring 81 is installed in the first annular groove, and a second non-metallic support ring 82 is installed in the second annular groove. In this way, the service life and sealing performance of the first sealing ring and the second sealing ring can be ensured, and the problem of jamming of the sealing ring at low temperature is solved.

[0044] In any one of the above embodiments, the housing 1 is radially provided with an exhaust port C (No. 12) at the position where the large inner diameter portion transitions to the small inner diameter portion, and an exhaust valve is installed on the exhaust port C. When medium leakage occurs at the dynamic sealing position, the leaked medium is discharged through the exhaust port C and the exhaust valve, and the exhaust valve can prevent low-temperature air from being sucked back and frozen.

[0045] In any one of the above embodiments, the elastic member can be a spring.

[0046] The above embodiments can be combined with each other and have corresponding technical effects.

[0047] The utility model also provides a liquid oxygen methane engine, at least including low temperature anti chattering check valve in any one of above embodiment.

[0048] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. Cryogenic anti-chattering check valve, characterized in that, At least comprising: a plug, a housing, a valve core assembly and an elastic member; the plug is installed at one end of the inlet of the housing, and is provided with an opening in the axial direction and in communication with the inside of the housing; the other end of the housing away from the plug is the outlet, and the housing is provided with a sealing boss on the inner wall near the outlet, and a first space is formed between the sealing boss and the plug, and the inner diameter of the first space near the inlet is larger than that of the other side; the valve core assembly is movably arranged in the first space, and is provided with a gas hole in the inside and in communication with the inlet and the outlet; the outer wall of the first side of the valve core assembly is provided with a first outer diameter part matched with the large inner diameter of the first space and a second outer diameter part matched with the small inner diameter, and the first outer diameter is larger than the second outer diameter; the end of the second side of the valve core assembly is located in the outlet and matched with the sealing end surface of the sealing boss; one end of the elastic member is installed on the side of the valve core assembly near the inlet, and the other end is matched with the back surface of the sealing end surface of the sealing boss to generate an acting force on the valve core assembly in the direction of the inlet.

2. The cryogenic anti-chug check valve of claim 1, wherein, the valve core assembly comprises a sleeve and a valve core; the outer wall of the sleeve is adapted to the change of the inner diameter of the first space and is movably arranged in the first space, and the inside of the sleeve is provided with a first gas hole for the medium to pass through; after the valve is opened, the first gas hole is in communication with the inlet and the outlet; the sleeve is provided with a spring mounting hole in the axial direction, and the side of the elastic member away from the sealing boss is arranged in the spring mounting hole; one side of the valve core is arranged in the sleeve and fixedly connected with the inner wall of the sleeve, and the other end is located in the outlet and matched with the sealing end surface of the sealing boss.

3. The cryogenic anti-chug check valve of claim 2, wherein, a first sealing member is arranged between the housing and the sleeve; the end surface of the valve core matched with the sealing boss is provided with a second sealing member; the first sealing member is a dynamic seal, and the second sealing member is a static seal.

4. The cryogenic anti-chug check valve of claim 3, wherein, the first sealing member comprises a first sealing ring arranged between the small inner diameter part of the housing and the sleeve, and a second sealing ring arranged between the large inner diameter part of the housing and the sleeve; the diameter of the first sealing ring is smaller than that of the second sealing ring.

5. The cryogenic anti-chug check valve of claim 4, wherein, the valve core assembly further comprises a gland fixedly arranged on the side of the valve core near the inlet; one side of the gland presses the second sealing ring tightly between the housing and the sleeve, and the other side is matched with the plug; the gland is provided with a second gas hole in communication with the inlet and the first gas hole.

6. The cryogenic anti-chug check valve of claim 5, wherein, the outer wall of the sleeve near the outlet is provided with a stop ring limiting the first sealing ring.

7. The cryogenic anti-chug check valve of claim 6, wherein, at least one annular groove is arranged on the outer wall of the sleeve between the first sealing ring and the second sealing ring, and a non-metallic support ring is arranged in the annular groove.

8. Cryogenic anti-chattering check valve according to any one of claims 2 to 7, characterized in that an exhaust port is radially arranged at the position where the large inner diameter part of the housing transitions to the small inner diameter part.

9. The cryogenic anti-chug check valve of claim 7, wherein, the plug and the housing are connected through threads, and a third sealing member is arranged at the connection; the third sealing member is arranged as a static seal.

10. A liquid oxygen-methane engine characterized by, at least comprising the low-temperature anti-chattering check valve of any one of claims 1 to 9.

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