CN112983881B - Sealing opening ring, liquid rocket engine centrifugal pump and liquid rocket engine - Google Patents
Sealing opening ring, liquid rocket engine centrifugal pump and liquid rocket engine Download PDFInfo
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- CN112983881B CN112983881B CN202110559615.8A CN202110559615A CN112983881B CN 112983881 B CN112983881 B CN 112983881B CN 202110559615 A CN202110559615 A CN 202110559615A CN 112983881 B CN112983881 B CN 112983881B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
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- 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
- F02K9/46—Feeding propellants using pumps
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The application provides a seal mouthful ring, liquid rocket engine centrifugal pump and liquid rocket engine, this seal mouthful ring includes: the pump comprises an inner ring and an outer ring sleeved outside the inner ring, wherein the inner side wall of the inner ring is sleeved at the position of a convex shoulder of a pump wheel, and the outer side wall of the outer ring is in clearance fit with a pump shell; the inner ring is provided with a plurality of ball holes along the circumferential direction, and balls are arranged in the ball holes; the diameter of one end of the ball hole far away from the outer ring is smaller than that of the balls, and the depth of the ball hole along the radial direction of the inner ring is smaller than that of the balls, so that a part of the balls are exposed out of the ball hole. The application provides a sealing opening ring, when the fluid membrane bearing capacity is not enough, sealing opening ring and impeller contact under the effect of gravity, because the radial degree of depth of inner ring is less than the diameter of ball along the ball hole for partly exposing of ball and impeller rolling contact, reduced the wearing and tearing of sealing opening ring and impeller, promoted the sealed effect between impeller and the pump case, thereby increase centrifugal pump's reliability and operating efficiency.
Description
Technical Field
The application relates to the technical field of jet propulsion devices, in particular to a sealing opening ring for a liquid rocket engine, a liquid rocket engine centrifugal pump and a liquid rocket engine.
Background
The liquid rocket engine comprises a fuel gas generator, a centrifugal pump, a thrust chamber and the like. When the centrifugal pump works, the pump wheel rotates at high speed to pressurize liquid, the outlet of the pump wheel is a high-pressure area, the inlet of the pump wheel is a low-pressure area, and the pump shell is a fixed part, so that a certain gap is formed between the pump wheel and the pump shell, and high-pressure liquid leaks inwards to the inlet of the pump wheel under the action of pressure difference, namely volume loss is caused. To reduce this part loss, a fixed seal ring or a floating seal ring is typically placed at the shoulder of the impeller.
At present, a fixed seal opening ring generally leaves a larger gap for preventing the fixed seal opening ring from being in collision and abrasion with a convex shoulder of a pump wheel, and the throttling effect is poor. The floating seal ring has the advantage of good throttling effect, and is widely applied to a system with high requirement on the performance of the centrifugal pump to reduce the volume loss and improve the pump efficiency.
However, when the floating seal ring is started and shut down along with the system, the bearing capacity of the gap fluid is insufficient under the condition of low rotating speed, the floating seal ring is in short contact to form sliding friction and then is abraded, the seal gap is increased after multiple operations, the pump efficiency is reduced, the rotating speed is low under the low working condition, and the problem also exists. In a high-speed and low-pressure system, if the end face pressure of the seal ring is too low, the floating seal ring and the impeller may wear to lower the pump efficiency.
Disclosure of Invention
The application provides a sealing opening ring of a liquid rocket engine, the liquid rocket engine centrifugal pump and the liquid rocket engine aiming at the defects in the prior art, and aims to solve the technical problem that the sealing opening ring in the existing liquid rocket engine centrifugal pump is abraded with a pump wheel to reduce the pump efficiency when the bearing capacity is insufficient.
In a first aspect, embodiments of the present application provide a seal ring for a centrifugal pump of a liquid rocket engine, the seal ring being used for forming a sealing pair between a pump wheel and a pump casing of the centrifugal pump of the liquid rocket engine, and the seal ring comprises: the pump comprises an inner ring and an outer ring sleeved outside the inner ring, wherein the inner side wall of the inner ring is sleeved at the position of a convex shoulder of the pump wheel, and the outer side wall of the outer ring is in clearance fit with the pump shell; the inner ring is provided with a plurality of ball holes along the circumferential direction, and balls are arranged in the ball holes; the diameter of one end of the ball hole, which is far away from the outer ring, is smaller than that of the balls, and the depth of the ball hole along the radial direction of the inner ring is smaller than that of the balls, so that a part of the balls are exposed out of the ball hole.
Optionally, the ball hole includes a first hole section and a second hole section connected in sequence, and the first hole section is located at one end of the second hole section close to the outer ring; the diameter of the second hole section is gradually reduced from one end close to the first hole section to one end far away from the first hole section.
Optionally, the seal collar further includes a ball sleeve, the ball sleeve is embedded in the first hole section, and the ball is in clearance fit with the ball sleeve.
Optionally, the material of the ball sleeve comprises a soft metal material or a non-metal material with self-lubricity.
Optionally, the maximum dimension of the balls exposed out of the inner ring is smaller than a seal gap between the pump wheel and the pump casing.
Optionally, the outer side surface of the inner ring is in interference fit with the inner side surface of the outer ring.
Optionally, a plurality of the ball holes are arranged in a multi-row interval manner along the axial direction of the inner ring.
Optionally, the inner side of the inner ring is provided with a plurality of annular grooves, and the annular grooves are arranged at intervals along the axial direction of the inner ring.
In a second aspect, an embodiment of the present application further provides a centrifugal pump for a liquid rocket engine, including: a pump housing, a pump wheel, and the seal ring of the first aspect; the pump shell comprises a pump shell body and a baffle ring arranged on the inner side of the pump shell body, the inner side wall of the inner ring is sleeved at the position of a convex shoulder of the pump wheel, and a radial movable gap and an axial movable gap are reserved between the outer side wall of the outer ring and the inner side of the baffle ring.
In a third aspect, the embodiments of the present application further provide a liquid rocket engine, including the centrifugal pump of the liquid rocket engine of the second aspect.
The beneficial technical effects brought by the technical scheme provided by the embodiment of the application at least comprise:
according to the sealing opening ring provided by the embodiment of the application, the ball holes and the balls are arranged in the inner ring, and the sealing opening ring floats under the action of the bearing force of the fluid film, so that the balls can be separated from the pump wheel; when the pump impeller is at the start, shut down, under the operating mode of low rotational speed operating mode or high rotational speed, the low pressure, because the fluid film bearing capacity in the seal clearance is not enough, the seal mouth ring contacts with the pump impeller under the effect of gravity this moment, because the radial degree of depth of ball hole edge inner ring is less than the diameter of ball, make partly outside that is located the ball hole of ball and contact with the pump impeller, thereby realize the rolling contact of seal mouth ring and pump impeller, reduce the wearing and tearing of seal mouth ring and pump impeller, the sealed effect between pump impeller and the pump case has been promoted, thereby increase liquid rocket engine centrifugal pump's reliability and operating efficiency.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a mounting structure of a sealing opening ring in a centrifugal pump of a liquid rocket engine according to an embodiment of the application;
FIG. 2 is an enlarged view of A in FIG. 1 provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of an overall structure of a seal ring according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of an internal structure of a seal ring according to an embodiment of the present disclosure;
FIG. 5 is an enlarged view of B in FIG. 4 according to an embodiment of the present disclosure;
fig. 6 is a schematic view illustrating installation dimensions of ball holes and balls in an inner ring of a seal ring according to an embodiment of the present disclosure.
In the figure:
1-a pump casing; 11-a pump housing body; 12-a baffle ring;
2-a pump impeller;
3-sealing the orifice ring; 31-inner ring; 31 a-ball hole; 31 b-an annular groove; 32-outer ring; 33-a ball; 34-ball sleeve.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.
As shown in fig. 1 to 5, the embodiment of the present application provides a seal mouth ring 3 for a centrifugal pump of a liquid rocket engine, the seal mouth ring 3 is used for forming a seal pair between a pump wheel 2 and a pump shell 1 of the centrifugal pump of the liquid rocket engine, and the seal mouth ring 3 comprises: the outer ring 32 is sleeved outside the inner ring 31 and used for packaging and limiting the inner ring 31. The inner side wall of the inner ring 31 is used for being sleeved at the shoulder position of the pump wheel 2, and the outer side wall of the outer ring 32 is used for being in clearance fit with the pump shell 1. The shoulder position of the pump impeller 2 refers to a position where the size of the shaft body of the pump impeller 2 changes abruptly.
Specifically, referring to fig. 4 and 5, the inner ring 31 is provided with a plurality of ball holes 31a in a circumferential direction, the ball holes 31a are arranged in a radial direction of the inner ring 31 and penetrate through the inner ring 31, and a ball 33 is arranged in each ball hole 31a, and the ball 33 is freely movable in the ball hole 31 a. As shown in fig. 6, a diameter d3 of an end of the ball hole 31a remote from the outer ring 32 is smaller than a diameter d1 of the balls 33, so that the balls 33 are confined in the ball hole 31a without falling out.
It should be noted that, in the embodiment of the present application, there may be one or two or more, and this is not particularly limited in the embodiment of the present application.
Further, with continued reference to fig. 6, the depth h1 of the ball hole 31a in the radial direction of the inner ring 31 is smaller than the diameter d1 of the balls 33, so that a part of the balls 33 can be exposed to the outside of the ball hole 31a, and the balls 33 can be in rolling contact with the pump impeller 2 when the oil seal bearing capacity is insufficient.
During operation, as shown in fig. 2, fluid flows from a high-pressure region to a low-pressure region through a seal gap δ between the pump wheel 2 and the inner side of the seal ring (corresponding to the inner side of the inner ring 31), and the left end surface of the seal ring 3 is brought into contact with the end surface of the pump housing 1 by the high-pressure fluid to seal the seal ring. When the pump wheel 2 is in a high-rotating-speed working condition, the sealing opening ring 3 floats under the action of fluid film bearing force in the sealing gap delta, so that the sealing opening ring is separated from a convex shoulder of the pump wheel 2, and throttling work is performed in a non-contact mode.
When the pump wheel 2 works under the working conditions of starting, shutdown or low rotating speed, the bearing capacity of a fluid film in the sealing gap delta is insufficient, the sealing opening ring 3 cannot float, and at the moment, the balls 33 in the ball hole 31a are in rolling contact with the shoulder of the pump wheel 2; similarly, in a system with high rotation speed and low pressure, the same effect is achieved when the seal opening ring 3 cannot float due to the fact that the end face pressure is too small and the inertia force of the floating ring is large. The sealing opening ring 3 structure avoids the problem that the traditional sealing opening ring 3 and the pump impeller 2 are seriously abraded, improves the sealing performance of products, and increases the reliability and the operating efficiency of the centrifugal pump of the liquid rocket engine.
The seal ring 3 provided in the present embodiment has the ball holes 31a and the balls 33 provided in the inner ring 31, and the seal ring 3 floats by the load of the fluid film so that the balls 33 can be separated from the pump impeller 2; when the pump wheel 2 is under the working conditions of starting, shutdown and low rotating speed or the working conditions of high rotating speed and low pressure, because the bearing capacity of a fluid film in a sealing gap is insufficient, the sealing opening ring 3 is in contact with the pump wheel 2 under the action of gravity, and because the radial depth of the ball hole 31a along the inner ring 31 is smaller than the diameter of the ball 33, a part of the ball 33 is positioned outside the ball hole 31a and is in contact with the pump wheel 2, so that the rolling contact between the sealing opening ring 3 and the pump wheel 2 is realized, the abrasion between the sealing opening ring and the pump wheel 2 is reduced, the sealing effect between the pump wheel 2 and the pump shell 1 is improved, and the reliability and the operating efficiency of the liquid rocket engine centrifugal pump are improved.
Optionally, referring to fig. 5, the size of the opening of the left end surface of the outer ring 32 is shrunk inwards, that is, the diameter of the opening of the left end surface of the outer ring 32 is smaller than the diameter of the opening at the position where the outer ring 32 is matched with the inner ring 31, so as to form a shoulder structure, so that the axial limit when the inner ring 31 is matched with the outer ring 32 is facilitated, thereby improving the preparation efficiency of the sealing ring, and simultaneously improving the structural stability of the whole sealing ring.
In some embodiments, with continued reference to fig. 3-6, ball bore 31a includes a first bore segment (not shown) and a second bore segment (not shown) connected in series, the first bore segment being located at an end of the second bore segment adjacent outer ring 32, i.e., the first bore segment is closer to outer ring 32 than the second bore segment. The diameter of the first bore section does not change, i.e. the first bore section may be regarded as a cylindrical bore. The diameter of the second hole section gradually becomes smaller from one end close to the first hole section to one end far away from the first hole section, namely the second hole section can be regarded as a conical hole. Furthermore, the diameter d2 of the first bore section is equal to the maximum diameter of the second bore section.
Specifically, when the fluid film bearing force is insufficient, the balls 33 are in contact with the inner side wall of the second hole section by gravity, and a portion of the balls 33 is exposed to the outside of the ball hole 31a from the end of the second hole section away from the first hole section (the exposed size of the balls 33 to the ball hole 31a is h 3). The clearance e between the ball 33 and the hole bottom is ensured by adjusting the depth h2 of the first hole section (or the depth of the second hole section), the hole bottom angle alpha and the diameter d3 of one end of the second hole section far away from the first hole section, so that the ball 33 can move freely up and down.
In this embodiment, the ball hole 31a is designed in a sectional structure, and includes a cylindrical first hole section and a conical second hole section, since the diameter of the end of the second hole section far from the first hole section is smaller than the diameter of the ball 33, the ball 33 can be prevented from falling out of the ball hole 31a, and the diameter of the ball 33 is larger than the sum of the depths of the first hole section and the second hole section, so that a part of the ball 33 can be exposed outside the ball hole 31a to be in rolling contact with the pump wheel 2 when the fluid film bearing force is insufficient.
In some embodiments, with continued reference to fig. 5 and 6, the seal ring 3 further includes a ball sleeve 34 in addition to the outer ring 32, the inner ring 31 and the balls 33, the ball sleeve 34 is embedded in the first hole section of the ball hole 31a, and an end of the ball sleeve 34 away from the outer ring 32 abuts against a junction of the second hole section and the first hole section (i.e., a size abrupt change position of the ball hole 31 a).
Specifically, an interference fit may be provided between an outer sidewall of the ball sleeve 34 and an inner sidewall of the first bore section to prevent the ball sleeve 34 from loosening or falling off. The balls 33 are in clearance fit with the ball sleeve 34, so that the balls 33 can move in the ball sleeve 34. Ball sleeve 34 mainly used protects ball 33, reduces ball 33's wearing and tearing, also can carry on spacingly to ball 33 simultaneously, avoids ball 33 to rock in ball hole 31a and influence the rolling contact effect.
Alternatively, the material of the ball sleeve 34 includes a soft metal material having self-lubricity or a non-metal material, wherein the soft metal material having self-lubricity may be copper or silver, and the non-metal material having self-lubricity may be fluoroplastic, ceramic, or graphite.
In this embodiment, the ball sleeve 34 is arranged in the ball hole 31a, so that the ball 33 can be protected, the abrasion of the ball 33 is reduced, the ball 33 can be limited, and the rolling contact effect is prevented from being influenced by the fact that the ball 33 shakes in the ball hole 31 a; the ball sleeve 34 is made of soft metal material or non-metal material with self-lubricating property, so that the friction force of the balls 33 between the inner walls of the ball sleeve 34 can be reduced, the rolling flexibility of the balls 33 is improved, and the abrasion of the balls 33 is reduced.
In some embodiments, with continued reference to fig. 1 and 6, the maximum size of the exposed inner ring 31 of the balls 33 needs to be smaller than the sealing gap δ between the pump impeller 2 and the pump casing 1, so that when the seal ring 3 floats under the load-bearing force of the oil seal, the exposed balls 33 are ensured not to contact with the pump impeller 2, thereby reducing the wear of the balls 33.
In some embodiments, in order to make the connection between the inner ring 31 and the outer ring 32 tighter, the outer side of the inner ring 31 and the inner side of the outer ring 32 are in an interference fit. In the specific process preparation process of the seal mouth ring 3, after the balls 33 are installed in the corresponding ball holes 31a on the inner ring 31, the ball 33 can be encapsulated and limited by installing the outer ring 32.
Alternatively, the inner ring 31 and the outer ring 32 may be assembled by a hot assembly method or a press assembly method, so as to ensure an interference fit between the inner ring 31 and the outer ring 32.
In this embodiment, the outer ring 32 and the inner ring 31 are in interference fit, so that the structural strength and the sealing performance between the outer ring 32 and the inner ring 31 can be improved, the separation of the outer ring 32 and the inner ring 31 in the working process to cause the falling of the balls 33 is avoided, the sealing effect of the whole sealing opening ring 3 is favorably improved, and the stability of the whole liquid rocket engine centrifugal pump is improved.
In some embodiments, with continued reference to fig. 3 to 5, the plurality of ball holes 31a are arranged in a plurality of rows at intervals along the axial direction of the inner ring 31, that is, the plurality of ball holes 31a form a plurality of rows (two rows are illustrated in the figure) along the circumferential direction of the inner ring 31, each row may include a plurality of ball holes 31a equally spaced along the circumferential direction of the inner ring 31, and adjacent rows are spaced along the axial direction of the inner ring 31.
It should be noted that the number of the ball holes 31a in the present embodiment is two or more, and the specific number may be set according to the diameter of the inner ring 31.
Alternatively, the ball holes 31a of adjacent rows may be arranged in a staggered manner, or may be arranged in parallel along the axial direction of the inner ring 31. The number and the list of the ball holes 31a are set according to the size of the seal port ring 3, and are not particularly limited in this embodiment.
It will be appreciated that, when the ball hole 31a is designed in the above-described manner, the balls 33 correspondingly disposed in the ball hole 31a are also arranged in the above-described manner.
In this embodiment, ball 33 in ball hole 31a and the ball hole 31a is multiseriate interval arrangement along the axial of inner ring 31, can reduce the frictional force between ball 33 and the pump impeller 2 of seal mouthful ring 3 when oil blanket pressure is not enough for rolling contact between seal mouthful ring 3 and the pump impeller 2 is more smooth, thereby reduces the degree of wear of single ball 33, is favorable to postponing seal mouthful ring 3's life, increases the operating stability of whole centrifugal pump.
In some embodiments, with continued reference to fig. 3 to 6, the inner side of the inner ring 31 is provided with a plurality of annular grooves 31b (three are illustrated in the drawings), the annular grooves 31b are formed along the inner side of the inner ring 31 and are recessed toward the outer ring 32, and the annular grooves 31b form a complete annular groove structure along the circumferential direction of the inner side of the inner ring 31. A plurality of annular grooves 31b are arranged at intervals along the axial direction of the inner ring 31.
In this embodiment, the annular groove 31b is provided on the inner side of the inner ring 31, so that the flow resistance of the oil can be increased, the throttling effect can be improved, and the sealing performance of the sealing lip ring 3 can be improved.
Optionally, with continued reference to fig. 3 to 5, a row of ball holes 31a is disposed between adjacent annular grooves 31b, and balls 33 are disposed in the corresponding ball holes 31a, so as to facilitate supporting of the oil seal on the seal opening ring 3, and further improve the sealing performance.
Based on the same inventive concept, with continuing reference to fig. 1 and fig. 2, the present application further provides a centrifugal pump for a liquid rocket engine, including: a pump housing 1, a pump impeller 2, and a seal ring 3 as previously described in the embodiments of the present application.
Specifically, the pump casing 1 includes a pump casing body 11 and a stopper ring 12, the stopper ring 12 is provided inside the pump casing body 11, and a seal gap δ is formed between the inside of the seal ring (corresponding to the inside of the inner ring 31) and the pump impeller 2. The inner side wall of the inner ring 31 of the sealing opening ring 3 is sleeved at the position of a convex shoulder of the pump wheel 2, and a radial movable gap and an axial movable gap are respectively reserved between the outer side wall of the outer ring 32 of the sealing opening ring 3 and the inner side of the baffle ring 12.
Alternatively, the retainer ring 12 may be screwed or welded to the pump casing body 11. The inboard of keeping off ring 12 is provided with the limit structure of diameter sudden change, leaves radial clearance and axial clearance between this limit structure and the outer ring 32 of seal mouthful ring 3, guarantees that seal mouthful ring 3 floats under the effect of oil blanket bearing capacity to can carry out axial and circumference limiting displacement to the outer ring 32 of seal mouthful ring 3.
The centrifugal pump of the liquid rocket engine provided by the embodiment comprises the sealing port ring 3 in each embodiment, wherein the sealing port ring 3 is provided with ball holes 31a and balls 33 in an inner ring 31, and the sealing port ring 3 floats under the load force of a fluid film so that the balls 33 can be separated from the pump wheel 2; when the pump wheel 2 is under the working conditions of starting, shutdown and low rotating speed or the working conditions of high rotating speed and low pressure, because the bearing capacity of a fluid film in the sealing gap is insufficient, the sealing opening ring 3 is in contact with the pump wheel 2 under the action of gravity, and because the radial depth of the ball hole 31a along the inner ring 31 is smaller than the diameter of the ball 33, a part of the ball 33 is positioned outside the ball hole 31a and is in contact with the pump wheel 2, so that the rolling contact between the sealing opening ring 3 and the pump wheel 2 is realized, the abrasion between the sealing opening ring and the pump wheel 2 is reduced, the sealing effect between the pump wheel 2 and the pump shell 1 is improved, and the reliability of the liquid rocket engine centrifugal pump is improved.
Based on the same inventive concept, the embodiment of the application also provides a liquid rocket engine, which comprises the liquid rocket engine centrifugal pump in the embodiment of the application, and the power performance and the working stability of the liquid rocket engine can be improved by utilizing the liquid rocket engine centrifugal pump.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
1. the inner ring is provided with ball holes and balls, and the sealing opening ring floats under the action of the bearing force of the fluid film, so that the balls can be separated from the pump wheel; when the pump impeller is started, shut down, under the working condition of low rotating speed or the working condition of high rotating speed, low pressure, because the fluid film bearing capacity in the seal clearance is not enough, the seal opening ring contacts with the pump impeller under the effect of gravity this moment, because the radial degree of depth of ball hole edge inner ring is less than the diameter of ball, make partly outside that is located the ball hole of ball and contact with the pump impeller, thereby realize the rolling contact of seal opening ring and pump impeller, reduce the wearing and tearing of seal opening ring and pump impeller, the sealed effect between pump impeller and the pump case has been promoted, thereby increase the reliability of liquid rocket engine centrifugal pump.
2. The ball hole adopts the design of sectional type structure, including columniform first hole section and conical second hole section, because the diameter that the diameter of the one end of first hole section is kept away from to the second hole section is less than the diameter of ball, can prevent that the ball from falling out from the ball hole to the diameter of ball is greater than the degree of depth sum of first hole section and second hole section, makes partly can expose in the outside in the ball hole of ball, so that with pump impeller rolling contact when the fluid film bearing capacity is not enough.
3. The ball sleeve is arranged in the ball hole, so that the ball can be protected, the abrasion of the ball is reduced, the ball can be limited, and the rolling contact effect is prevented from being influenced by the fact that the ball shakes in the ball hole; the material of ball cover adopts soft metal material or non-metallic material that has self-lubricating nature, can reduce the frictional force of ball between the ball cover inner wall, promotes the roll flexibility of ball to be favorable to reducing the wearing and tearing of ball.
4. The maximum size of the exposed inner ring of the ball is required to be smaller than the sealing clearance between the pump wheel and the pump shell, and when the sealing opening ring floats under the bearing force action of the oil seal, the exposed ball is prevented from contacting with the pump wheel, so that the abrasion of the ball is reduced.
5. The outer ring and the inner ring are in interference fit, the structural strength and the sealing performance between the outer ring and the inner ring can be improved, the separation of the outer ring and the inner ring in the working process is avoided, the ball is prevented from falling off, the sealing effect of the whole sealing opening ring is favorably improved, and the stability of the whole liquid rocket engine centrifugal pump is improved.
6. The balls in the ball hole and the ball hole are arranged in a multi-column spaced mode along the axial direction of the inner ring, friction force between the balls of the sealing opening ring and the pump impeller can be reduced when oil seal pressure is insufficient, rolling contact between the sealing opening ring and the pump impeller is smooth, abrasion degree of a single ball is reduced, service life of the sealing opening ring is prolonged, and operation stability of the whole centrifugal pump is improved.
7. The annular groove is formed in the inner side of the inner ring, so that the flow resistance of oil can be increased, the throttling effect is improved, and the sealing performance of the sealing opening ring is improved.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (6)
1. A seal eye for a liquid rocket engine centrifugal pump, the seal eye for forming a seal pair between a pump impeller and a pump casing of the liquid rocket engine centrifugal pump, comprising: the pump comprises an inner ring and an outer ring sleeved outside the inner ring, wherein the inner side wall of the inner ring is sleeved at the position of a convex shoulder of the pump wheel, and the outer side wall of the outer ring is in clearance fit with the pump shell;
the inner ring is provided with a plurality of ball holes along the circumferential direction, and balls are arranged in the ball holes; the diameter of one end of the ball hole, which is far away from the outer ring, is smaller than that of the balls, and the depth of the ball hole along the radial direction of the inner ring is smaller than that of the balls, so that a part of the balls are exposed out of the ball hole;
the ball hole comprises a first hole section and a second hole section which are sequentially connected, and the first hole section is positioned at one end, close to the outer ring, of the second hole section; the diameter of the second hole section is gradually reduced from one end close to the first hole section to one end far away from the first hole section;
the diameter of an opening on the left end face of the outer ring is smaller than that of an opening at the position where the outer ring is matched with the inner ring, so that a hole shoulder structure is formed;
the sealing opening ring further comprises a ball sleeve, the ball sleeve is embedded in the first hole section of the ball hole, and one end, far away from the outer ring, of the ball sleeve abuts against the joint of the second hole section and the first hole section; the outer side wall of the ball sleeve is in interference fit with the inner side wall of the first hole section, and the balls are in clearance fit with the ball sleeve; the material of the ball sleeve comprises a soft metal material or a non-metal material with self-lubricating property;
the maximum size of the ball exposed out of the inner ring is smaller than the sealing gap between the pump wheel and the pump shell.
2. The seal ring of claim 1, wherein an outer side of said inner ring has an interference fit with an inner side of said outer ring.
3. The seal ring as claimed in claim 1, wherein said plurality of ball holes are spaced in a plurality of rows along an axial direction of said inner ring.
4. The seal ring as claimed in claim 1 wherein said inner ring is provided with a plurality of annular grooves on an inner side thereof, said plurality of annular grooves being spaced axially of said inner ring.
5. A liquid rocket engine centrifugal pump, comprising: a pump housing, a pump wheel, and the seal ring of any one of claims 1 to 4;
the pump shell comprises a pump shell body and a baffle ring arranged on the inner side of the pump shell body, the inner side wall of the inner ring is sleeved at the position of a convex shoulder of the pump wheel, and a radial movable gap and an axial movable gap are reserved between the outer side wall of the outer ring and the inner side of the baffle ring.
6. A liquid rocket engine comprising the liquid rocket engine centrifugal pump of claim 5.
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| CN202110559615.8A CN112983881B (en) | 2021-05-21 | 2021-05-21 | Sealing opening ring, liquid rocket engine centrifugal pump and liquid rocket engine |
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| CN202110559615.8A CN112983881B (en) | 2021-05-21 | 2021-05-21 | Sealing opening ring, liquid rocket engine centrifugal pump and liquid rocket engine |
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| CN112983881B true CN112983881B (en) | 2021-09-17 |
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| CN112983881A (en) | 2021-06-18 |
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