Sealing structure of turbine pump of liquid rocket engine

Abstract

The utility model discloses a sealing structure of a liquid rocket engine turbine pump, which relates to the technical field of rocket engine turbine pumps and comprises a turbine pump casing, a first connecting component is arranged on the outer wall of the turbine pump casing, and a second connecting component is arranged at the bottom end of the first connecting component. The first connecting assembly comprises a first connecting flange and a connecting block, the second connecting assembly comprises a second connecting flange and an L-shaped inserting plate, an annular fixing plate is arranged in the second connecting flange, a set of second springs are arranged at the top end of the annular fixing plate, and a third sealing ring is arranged on the set of second springs. Basic sealing guarantee is provided when the inserting ring and the sealing shell are initially matched, a third sealing ring compensates tiny deformation or gap change of the sealing face in a self-adaptive mode through the elastic force of a second spring, the problem that the sealing performance is reduced due to gaps between flange plates is effectively solved, and a connecting block and an L-shaped inserting plate facilitate flange alignment for installation.

Description

Technical Field

[0001] The utility model relates to the technical field of rocket engine turbo pumps, in particular to a sealing structure of a liquid rocket engine turbo pump. Background Art

[0002] In the aerospace industry, liquid rocket engines, as the core propulsion system of rockets, have a performance and reliability that directly determines the success or failure of rocket launch missions. Turbopumps, as key components of liquid rocket engines, are tasked with precisely delivering cryogenic, high-pressure, highly corrosive, and volatile propellants to the combustion chamber. The sealed connection between the turbopump inlet and outlet piping and the casing is crucial to the safety, stability, and mission accuracy of the entire rocket launch system.

[0003] The existing turbine pump housing and the inlet and outlet pipes are often connected by flanges. The flange connection method can provide a stable and reliable connection and provides the basic conditions for achieving good sealing. However, this connection method still has some problems. There may be some gaps between the flanges, which leads to a decrease in sealing. At the same time, there are many round holes between the flanges. During installation, multiple round holes need to be aligned and then fixed with bolts. However, it is easy to shake during installation, making it difficult to align the round holes, which increases the difficulty of installation between the flanges. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a sealing structure for a liquid rocket engine turbopump, which solves the problem that there may be some gaps between the flanges, thereby reducing the sealing performance. At the same time, there are many round holes between the flanges. During installation, multiple round holes need to be aligned and then fixed with bolts. However, shaking is likely to occur during installation, making it difficult to align the round holes, which increases the difficulty of installation between the flanges.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A sealing structure for a liquid rocket engine turbopump, comprising a turbopump housing, an outer wall of the turbopump housing being provided with a first connecting assembly, a bottom end of the first connecting assembly being provided with a second connecting assembly;

[0006] The first connecting assembly includes a first connecting flange, the first connecting flange is fixedly connected to the turbine pump housing, the outer wall of the first connecting flange is fixedly connected to the first annular sealing shell and the second annular sealing shell, and the outer wall of the first connecting flange is fixedly mounted with two connecting blocks;

[0007] The second connecting assembly includes an outlet pipe, a second connecting flange is fixedly installed on the end of the outlet pipe, two L-shaped plug plates are fixedly installed on the outer wall of the second connecting flange, a first sealing plug ring and a second sealing plug ring are fixedly installed on the top of the second connecting flange, an annular fixed plate is fixedly installed on the inner wall of the first sealing plug ring, a group of second springs is fixedly installed on the top of a group of second springs, and a third sealing ring is fixedly installed on the top of the annular movable plate.

[0008] Preferably, the inner walls of the first annular sealing shell and the second annular sealing shell are matched with the first sealing insert ring and the second sealing insert ring respectively, and the top ends of the first sealing insert ring and the second sealing insert ring are fixedly mounted with the first sealing ring and the second sealing ring respectively.

[0009] Preferably, the outer walls of the two connecting blocks are provided with slots, the slots match the L-shaped plug-in plates, the inner walls of the slots are provided with circular grooves, and the inner walls of the circular grooves are fixedly mounted with fixed circular plates.

[0010] Preferably, a pull rod is slidably passed through the outer wall of the fixed circular plate, and a bevel block is fixedly installed on the output end of the pull rod. The bevel block matches the circular groove, and the L-shaped plug plate is penetrated by a socket matching the bevel block.

[0011] Preferably, a first spring is sleeved on the outer wall of the pull rod, one end of the first spring is fixedly connected to the bevel block, and the other end of the first spring is fixedly connected to the fixed circular plate.

[0012] Preferably, a pull plate is fixedly mounted on one end of the outer wall of the pull rod, a damping shaft is fixedly mounted on the outer wall of the connecting block, and a supporting rotating plate is fixedly mounted on the output end of the damping shaft.

[0013] Beneficial effects

[0014] The utility model provides a sealing structure for a liquid rocket engine turbopump. Compared with the prior art, it has the following advantages:

[0015] (1) The sealing structure of the liquid rocket engine turbo pump is such that when the first connecting flange is fixedly connected to the second connecting flange, the first sealing insert and the first sealing ring will be inserted into the first annular sealing shell, and the second sealing insert and the second sealing ring will be inserted into the second annular sealing shell. At this time, the first sealing ring and the second sealing ring will be in close contact with the inner walls of the first annular sealing shell and the second annular sealing shell. At the same time, when the first sealing insert is inserted into the first annular sealing shell, the third sealing ring will be squeezed by the end of the first annular sealing shell, so that the second spring on the annular fixing plate in the first sealing insert is in a compressed state, resulting in the third sealing ring being in close contact with the connection between the first annular sealing shell and the first sealing insert, further enhancing the sealing effect. A multi-channel sealing structure is adopted, including the first sealing ring, the second sealing ring and the third sealing ring, which play a role in different sealing positions and working conditions respectively. The first sealing ring and the second sealing ring provide basic sealing protection when the insert ring and the sealing shell are initially matched, and the third sealing ring adaptively compensates for the slight deformation or gap change of the sealing surface through the elastic force of the second spring, effectively preventing the problem of reduced sealing performance caused by the gap between the flanges.

[0016] (2) The sealing structure of the liquid rocket engine turbo pump is such that when the first connecting flange needs to be aligned and installed with the second connecting flange, the second connecting flange is moved so that the L-shaped insert plate on the second connecting flange is inserted into the slot on the connecting block. During the insertion process, the L-shaped insert plate gradually squeezes the internal bevel block so that the bevel block enters the inner wall of the circular groove. When the insertion hole on the L-shaped insert plate is aligned with the bevel block, the bevel block is not squeezed and enters the insertion hole under the action of the first spring force, thereby completing the preliminary fixation between the first connecting flange and the second connecting flange. The circular hole on the first connecting flange can be aligned with the circular hole on the second connecting flange, thereby preventing shaking during subsequent bolt fixing and installation, and facilitating the fixing and installation of the two flanges. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the second connecting component of the present invention;

[0020] Figure 4 This is a cross-sectional view of the main structure of the utility model;

[0021] Figure 5 This is a cross-sectional view of the second connecting assembly of the present invention;

[0022] Figure 6This is a cross-sectional view of the first connecting component of the present invention;

[0023] Figure 7 This is a schematic diagram of the relevant structure of the annular fixing plate of the present utility model;

[0024] Figure 8 It is a cross-sectional view of the connecting block and the L-shaped inserting plate of the present invention.

[0025] In the figure: 1. turbine pump housing; 2. first connecting assembly; 21. first connecting flange; 22. first annular sealing shell; 23. second annular sealing shell; 24. connecting block; 25. circular groove; 26. pull rod; 27. pull plate; 28. first spring; 29. ​​bevel block; 210. damping shaft; 211. supporting rotating plate; 212. fixed circular plate; 3. second connecting assembly; 31. outlet pipe; 32. second connecting flange; 33. first sealing insert; 34. first sealing ring; 35. second sealing insert; 36. second sealing ring; 37. L-shaped insert; 38. annular fixed plate; 39. second spring; 310. annular movable plate; 311. third sealing ring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] This utility model provides two technical solutions:

[0028] Figures 1-8 A first embodiment is shown: a sealing structure of a liquid rocket engine turbopump, comprising a turbopump housing 1, a first connecting assembly 2 being provided on the outer wall of the turbopump housing 1, and a second connecting assembly 3 being provided at the bottom end of the first connecting assembly 2;

[0029] The first connecting assembly 2 includes a first connecting flange 21, which is fixedly connected to the turbine pump housing 1. The outer wall of the first connecting flange 21 is fixedly connected to a first annular sealing shell 22 and a second annular sealing shell 23, respectively. The outer wall of the first connecting flange 21 is fixedly mounted with two connecting blocks 24.

[0030] The second connecting assembly 3 includes an outlet pipe 31, a second connecting flange 32 is fixedly installed at the end of the outlet pipe 31, two L-shaped plug plates 37 are fixedly installed on the outer wall of the second connecting flange 32, a first sealing insert ring 33 and a second sealing insert ring 35 are fixedly installed on the top of the second connecting flange 32, an annular fixing plate 38 is fixedly installed on the inner wall of the first sealing insert ring 33, a group of second springs 39 are fixedly installed on the top of the annular fixing plate 38, an annular movable plate 310 is fixedly installed on the top of a group of second springs 39, a third sealing ring 311 is fixedly installed on the top of the annular movable plate 310, when the third sealing ring 311 is squeezed, the second spring 39 will be compressed, and under the action of the elastic force, the third sealing ring 311 will fit tightly with the connection between the first annular sealing shell 22 and the first sealing insert ring 33 to prevent liquid leakage from the connection.

[0031] The inner walls of the first annular sealing shell 22 and the second annular sealing shell 23 are matched with the first sealing insert ring 33 and the second sealing insert ring 35 respectively. The top ends of the first sealing insert ring 33 and the second sealing insert ring 35 are fixedly installed with the first sealing ring 34 and the second sealing ring 36 respectively, so that the first sealing insert ring 33 and the second sealing insert ring 35 can be inserted into the first annular sealing shell 22 and the second annular sealing shell 23, so that the first sealing ring 34 and the second sealing ring 36 will be in close contact with the inner walls of the first annular sealing shell 22 and the second annular sealing shell 23, thereby improving the sealing performance.

[0032] The outer walls of the two connecting blocks 24 are both provided with slots that match the L-shaped inserting plate 37. The inner walls of the slots are penetrated by a circular groove 25. A fixed circular plate 212 is fixedly installed on the inner wall of the circular groove 25. The L-shaped inserting plate 37 can be inserted into the slots.

[0033] Figures 1-8 A second embodiment is shown, which mainly differs from the first embodiment in that a pull rod 26 is slidably passed through the outer wall of the fixed circular plate 212, and a bevel block 29 is fixedly installed on the output end of the pull rod 26. The bevel block 29 matches the circular groove 25, and the L-shaped plug plate 37 is penetrated by a socket matching the bevel block 29. When the bevel block 29 is squeezed, it can slide in the circular groove 25. When the bevel block 29 is not squeezed, it can enter the socket under the action of the elastic force of the first spring 28, thereby completing the fixation of the L-shaped plug plate 37.

[0034] A first spring 28 is sleeved on the outer wall of the pull rod 26 , one end of the first spring 28 is fixedly connected to the bevel block 29 , and the other end of the first spring 28 is fixedly connected to the fixed circular plate 212 , and the elastic force of the first spring 28 can act on the bevel block 29 .

[0035] A pull plate 27 is fixedly installed at one end of the outer wall of the pull rod 26, and a damping shaft 210 is fixedly installed on the outer wall of the connecting block 24. A supporting rotating plate 211 is fixedly installed at the output end of the damping rotating shaft 210. The pull plate 27 can drive the pull rod 26 to move, so that the pull rod 26 can move the bevel block 29 out of the socket, and then rotate the supporting rotating plate 211 to one side of the pull plate 27. At this time, the supporting rotating plate 211 can fix the pull plate 27, thereby preventing the bevel block 29 from entering the L-shaped plug plate, making it convenient to move the L-shaped plug plate 37 out of the connecting block 24.

[0036] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0037] During operation, during installation, the L-shaped insert plate 37 on the second connecting flange 32 at the end of the outlet pipe 31 is aligned with the slot of the connecting block 24 on the first connecting flange 21 and inserted. During this process, the first sealing insert ring 33 and the second sealing insert ring 35 are respectively inserted into the first annular sealing shell 22 and the second annular sealing shell 23, preliminarily achieving the positioning of the connection between the pipe and the shell and the coordination of the partial sealing structure. The first sealing ring 34 and the second sealing ring 36 are in contact with the inner walls of the first annular sealing shell 22 and the second annular sealing shell 23 respectively, playing a preliminary sealing role to prevent the propellant from leaking from the gap between the insert ring and the sealing shell. At the same time, when the first sealing insert ring 33 is inserted into the first annular sealing shell 22, the third sealing ring 311 will be squeezed by the end of the first annular sealing shell 22, so that the second spring 39 on the annular fixing plate 38 in the first sealing insert ring 33 is in a compressed state, resulting in the third sealing ring 311 being tightly fitted with the connection between the first annular sealing shell 22 and the first sealing insert ring 33, further enhancing the sealing effect. A multi-channel sealing structure is adopted, including the first sealing ring 34, the second sealing ring 36 and the third sealing ring 311, which play a role in different sealing positions and working conditions respectively. The first sealing ring 34 and the second sealing ring 36 provide basic sealing when the insert ring and the sealing shell are initially matched. The sealing guarantee is achieved, and the third sealing ring 311 adaptively compensates for the slight deformation or gap change of the sealing surface through the elastic force of the second spring 39, effectively preventing the problem of reduced sealing caused by the gap between the flanges. During the insertion process, the L-shaped plug 37 will gradually squeeze the internal bevel block 29, so that the bevel block 29 enters the inner wall of the circular groove 25. When the insertion hole on the L-shaped plug 37 is aligned with the bevel block 29, the bevel block 29 is not squeezed, and the bevel block 29 enters the insertion hole under the action of the elastic force of the first spring 28, thereby completing the preliminary fixation between the first connecting flange 21 and the second connecting flange 32, so that the circular hole on the first connecting flange 21 can be aligned with the circular hole 32 on the second connecting flange, and then the first connecting flange 21 and the second connecting flange 32 are fixed and installed by bolts, thereby completing the sealing connection between the turbine pump housing 1 and the outlet pipe 31.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a liquid rocket engine turbopump, comprising a turbopump housing (1), characterized in that: A first connecting assembly (2) is provided on the outer wall of the turbine pump housing (1), and a second connecting assembly (3) is provided at the bottom end of the first connecting assembly (2); The first connecting assembly (2) comprises a first connecting flange (21), the first connecting flange (21) being fixedly connected to the turbine pump housing (1), the outer wall of the first connecting flange (21) being fixedly connected to a first annular sealing shell (22) and a second annular sealing shell (23), and two connecting blocks (24) being fixedly mounted on the outer wall of the first connecting flange (21); The second connecting assembly (3) comprises an outlet pipe (31), a second connecting flange (32) is fixedly mounted on the end of the outlet pipe (31), two L-shaped insert plates (37) are fixedly mounted on the outer wall of the second connecting flange (32), a first sealing insert ring (33) and a second sealing insert ring (35) are fixedly mounted on the top of the second connecting flange (32), an annular fixed plate (38) is fixedly mounted on the inner wall of the first sealing insert ring (33), a group of second springs (39) are fixedly mounted on the top of the annular fixed plate (38), an annular movable plate (310) is fixedly mounted on the top of the group of second springs (39), and a third sealing ring (311) is fixedly mounted on the top of the annular movable plate (310).

2. The sealing structure of a liquid rocket engine turbo pump according to claim 1, characterized in that: The inner walls of the first annular sealing shell (22) and the second annular sealing shell (23) are matched with the first sealing insert ring (33) and the second sealing insert ring (35), respectively. The top ends of the first sealing insert ring (33) and the second sealing insert ring (35) are fixedly mounted with a first sealing ring (34) and a second sealing ring (36), respectively.

3. The sealing structure of a liquid rocket engine turbo pump according to claim 1, characterized in that: The outer walls of the two connecting blocks (24) are each provided with a slot, the slot matching the L-shaped inserting plate (37), the inner wall of the slot is provided with a circular groove (25), and the inner wall of the circular groove (25) is fixedly mounted with a fixed circular plate (212).

4. The sealing structure of a liquid rocket engine turbo pump according to claim 3, characterized in that: A pull rod (26) is slidably passed through the outer wall of the fixed circular plate (212), and a bevel block (29) is fixedly installed on the output end of the pull rod (26). The bevel block (29) matches the circular groove (25), and a socket matching the bevel block (29) is passed through the L-shaped plug plate (37).

5. The sealing structure of a liquid rocket engine turbo pump according to claim 4, characterized in that: A first spring (28) is sleeved on the outer wall of the pull rod (26), one end of the first spring (28) is fixedly connected to the bevel block (29), and the other end of the first spring (28) is fixedly connected to the fixed circular plate (212).

6. The sealing structure of a liquid rocket engine turbo pump according to claim 5, characterized in that: A pull plate (27) is fixedly mounted on one end of the outer wall of the pull rod (26), a damping shaft (210) is fixedly mounted on the outer wall of the connecting block (24), and a supporting rotating plate (211) is fixedly mounted on the output end of the damping shaft (210).

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