Combined sealing structure for gas turbine pump

Abstract

The utility model discloses a combined sealing structure for a gas turbine pump, relates to the technical field of sealing, and solves the technical problem that a sealing device of a gas turbine pump in the prior art is poor in sealing effect. The combined sealing structure for the gas turbine pump comprises a rotating shaft and further comprises a first contact type end face seal, a second contact type end face seal and a non-contact type end face seal which are detachably installed on a unit, and the first contact type end face seal, the non-contact type end face seal and the second contact type end face seal are sequentially arranged on the rotating shaft in series. The unit is provided with an air inlet hole and two exhaust holes, the air inlet hole is communicated with the non-contact type end face in a sealed mode, and the two exhaust holes are communicated with the first contact type end face in a sealed mode and the second contact type end face in a sealed mode respectively. Therefore, the non-contact type end face seal is added between the first contact type end face seal and the second contact type end face seal, so that the sealing effect of the combined sealing structure for the gas turbine pump is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing, and in particular relates to a combined sealing structure for a gas turbine pump. Background Art

[0002] Liquid rocket engines refer to liquid propellant rocket engines. When a liquid rocket engine is working, the propellant and fuel are squeezed out of the tanks and enter the thrust chamber through the propellant delivery pipe. The propellant is mixed and atomized by the injector at the head of the thrust chamber to form fine droplets, which are heated and vaporized by the flame in the combustion chamber and burn violently, turning into high-temperature and high-pressure combustion gas in the combustion chamber. The combustion gas is accelerated into a supersonic airflow through the nozzle and ejected backward, generating thrust acting on the engine and pushing the rocket forward.

[0003] As an important part of the liquid oxygen-methane engine, the liquid oxygen pump is used to transport the cryogenic liquid oxygen required for the engine to work. The liquid oxygen pump is adjacent to the methane pump. Usually, a set of sealing devices is set between the liquid oxygen pump and the methane pump in the liquid rocket engine turbopump to prevent the two media from meeting. However, traditional seals often use circumferential seals, which have large leakage and weak pressure resistance. Utility Model Content

[0004] The utility model provides a combined sealing structure for a gas turbine pump, which is used to solve the technical problem that the sealing effect of a sealing device of a gas turbine pump in the prior art is poor.

[0005] The utility model is realized through the following technical solutions:

[0006] A combined sealing structure for a gas turbine pump comprises a rotating shaft, and also comprises a first contact end face seal, a second contact end face seal and a non-contact end face seal which are detachably mounted on a unit, wherein the first contact end face seal, the non-contact end face seal and the second contact end face seal are sequentially arranged in series on the rotating shaft, an air inlet hole and two exhaust holes are provided on the unit, the air inlet hole is connected to the non-contact end face seal, and the two exhaust holes are respectively connected to the first contact end face seal and the second contact end face seal.

[0007] Furthermore, the first contact end face seal comprises:

[0008] A first stationary ring seat is detachably mounted on the unit, a first through hole is formed on the first stationary ring seat, and the first through hole is connected to any of the exhaust holes;

[0009] A first sleeve, mounted on the rotating shaft;

[0010] A first moving ring connected to the first shaft sleeve;

[0011] The first stationary ring is installed on the first stationary ring seat through an axial compensation mechanism, and the first stationary ring is in contact with the first dynamic ring.

[0012] Furthermore, the first moving ring is drivingly connected to the first sleeve via a pin.

[0013] Furthermore, the non-contact end face seal includes:

[0014] A sealing shell is detachably mounted on the first stationary ring seat, a second through hole is opened on the sealing shell, and the second through hole is connected to the air inlet hole;

[0015] A second sleeve, sleeved outside the rotating shaft and screwed onto the first sleeve;

[0016] A third sleeve, sleeved outside the rotating shaft;

[0017] A compression sleeve, which is detachably mounted on the third sleeve and compressed on the second sleeve, and the second sleeve and the third sleeve are located at two ends of the compression sleeve;

[0018] A second moving ring connected to the second shaft sleeve;

[0019] A third moving ring connected to the third shaft sleeve;

[0020] The second stationary ring is installed on the sealing housing through an axial compensation mechanism and is in contact with the second dynamic ring.

[0021] The third static ring is installed on the sealing housing through an axial compensation mechanism and is in contact with the third dynamic ring.

[0022] Further, the second contact seal includes:

[0023] A fourth sleeve, sleeved outside the rotating shaft and screwed onto the third sleeve;

[0024] a fourth moving ring connected to the fourth shaft sleeve;

[0025] A second stationary ring seat is detachably mounted on the sealing housing, a third through hole is formed on the second stationary ring seat, and the third through hole is connected to the exhaust hole;

[0026] The fourth stationary ring is installed on the second stationary ring seat through an axial compensation mechanism and is in contact with the fourth moving ring.

[0027] Furthermore, comb seals are provided between the second shaft sleeve and the first stationary ring seat, and between the fourth shaft sleeve and the second stationary ring seat.

[0028] Furthermore, the axial compensation mechanism is a spring.

[0029] Furthermore, the sealing housing and the first stationary ring seat, the compression sleeve and the third shaft sleeve, and the sealing housing and the second stationary ring seat are all connected via set screws.

[0030] Furthermore, a seal is provided between the first stationary ring and the first stationary ring seat, and between the fourth stationary ring and the fourth stationary ring seat.

[0031] Furthermore, the sealing member is a C-shaped sealing ring.

[0032] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0033] The utility model provides a combined sealing structure for a gas turbine pump, comprising a rotating shaft, and also comprising a first contact end face seal, a second contact end face seal and a non-contact end face seal which are detachably mounted on a unit, and the first contact end face seal, the non-contact end face seal and the second contact end face seal are sequentially arranged in series on the rotating shaft, an air inlet and two exhaust holes are provided on the unit, the air inlet is connected to the non-contact end face seal, and the two exhaust holes are respectively connected to the first contact end face seal and the second contact end face seal.

[0034] Through the above structure, the sealing gas is first input into the air inlet, and then the rotating shaft is driven to rotate. The cryogenic liquid oxygen and cryogenic methane on both sides leak from the outer diameter to the inner diameter through the sealing end faces of the first contact end face seal and the second contact end face seal. After the sealing gas is introduced into the non-contact end face seal between the first contact end face seal and the second contact end face seal, the sealing gas flows to both sides, that is, flows in the direction close to the first contact end face seal and the second contact end face seal. When the sealing gas flowing to both sides meets and mixes with the cryogenic liquid oxygen and the cryogenic methane respectively, it is discharged through the two exhaust holes connected to the first contact end face seal and the second contact end face seal respectively, so as to achieve the purpose of preventing the cryogenic liquid oxygen and the cryogenic methane from mixing. Moreover, when the first contact end face seal and the second contact end face seal fail, the non-contact end face seal can prevent a large amount of oxygen and methane from leaking. Therefore, by adding the non-contact end face seal between the first contact end face seal and the second contact end face seal, the sealing effect of the combined sealing structure for the gas turbine pump provided by the utility model is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0036] Figure 1A schematic structural diagram of a combined sealing structure for a gas turbine pump provided in an embodiment of the utility model.

[0037] Marks and corresponding parts names in the attached drawings:

[0038] 1-rotating shaft, 2-unit, 21-inlet hole, 22-exhaust hole, 3-first contact end face seal, 31-first static ring seat, 32-first shaft sleeve, 33-first moving ring, 34-first static ring, 4-non-contact end face seal, 41-sealing housing, 42-second shaft sleeve, 43-third shaft sleeve, 44-pressure sleeve, 45-second moving ring, 46-third moving ring, 47-second static ring, 48-third static ring, 5-second contact end face seal, 51-fourth shaft sleeve, 52-fourth moving ring, 53-second static ring seat, 54-fourth static ring, 6-comb seal, 7-spring, 8-set screw, 9-C-type sealing ring. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0040] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.

[0041] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] Example:

[0044] This embodiment provides a combined sealing structure for a gas turbine pump, which is used to solve the technical problem that the sealing effect of the sealing device of the gas turbine pump in the prior art is poor. The combined sealing structure for the gas turbine pump includes a rotating shaft 1, and also includes a first contact end face seal 3, a second contact end face seal 5 and a non-contact end face seal 4 detachably mounted on a unit 2, wherein:

[0045] The first contact end face seal 3 is used to seal the cryogenic liquid oxygen.

[0046] The second contact end face seal 5 is used to seal the low-temperature methane.

[0047] The first contact end face seal 3 , the non-contact end face seal 4 and the second contact end face seal 5 are sequentially arranged in series on the rotating shaft 1 , that is, the non-contact end face seal 4 is located between the first contact end face seal 3 and the second contact end face seal 5 .

[0048] The unit 2 is provided with an air inlet 21 and two air outlets 22 . The air inlet 21 is connected to the non-contact end face seal 4 , and the two air outlets 22 are connected to the first contact end face seal 3 and the second contact end face seal 5 , respectively.

[0049] Through the above structure, the sealing gas is firstly input into the air inlet 21, and then the rotating shaft 1 is driven to rotate, and the cryogenic liquid oxygen and cryogenic methane on both sides leak from the outer diameter to the inner diameter through the sealing end faces of the first contact end face seal 3 and the second contact end face seal 5, and the non-contact end face seal 4 located between the first contact end face seal 3 and the second contact end face seal surface after the sealing gas is introduced, the sealing gas flows to both sides, that is, flows in the direction close to the first contact end face seal 3 and the second contact end face seal 5. When the sealing gas flowing to both sides meets the cryogenic liquid oxygen and cryogenic methane respectively, After being mixed, the oxygen and methane are discharged through the two exhaust holes 22 respectively connected to the first contact end face seal 3 and the second contact end face seal 5, so as to prevent the cryogenic liquid oxygen from mixing with the cryogenic methane. Moreover, when the first contact end face seal 3 and the second contact end face seal 5 fail, the non-contact end face seal 4 can prevent a large amount of leakage of oxygen and methane. Therefore, by adding the non-contact end face seal 4 between the first contact end face seal 3 and the second contact end face seal 5, the sealing effect of the combined sealing structure for the gas turbine pump provided by the utility model is better.

[0050] An optional implementation of this embodiment is as follows: the first contact end face seal 3 includes a first stationary ring seat 31, a first sleeve 32, a first dynamic ring 33 and a first stationary ring 34, wherein:

[0051] The first stationary ring seat 31 is detachably mounted on the unit 2 . A first through hole is formed on the first stationary ring seat 31 . The first through hole is connected to any exhaust hole 22 .

[0052] The first sleeve 32 is mounted on the rotating shaft 1 , so that when the rotating shaft 1 rotates, the first sleeve 32 is driven to rotate together.

[0053] The first movable ring 33 is connected to the first shaft sleeve 32 , so that when the first shaft sleeve 32 rotates, the first movable ring 33 is driven to rotate synchronously.

[0054] Optionally, the first movable ring 33 is transmission-connected to the first shaft sleeve 32 via a pin, so that the first movable ring 33 and the first shaft sleeve 32 connected via the pin are easier to assemble and disassemble.

[0055] The first stationary ring 34 is installed on the first stationary ring seat 31 through an axial compensation mechanism, and the first stationary ring 34 is in contact with the first moving ring 33 .

[0056] Through the above structure, the rotating shaft 1 rotates, driving the first sleeve 32 to rotate together, so that the first moving ring 33 connected to the first sleeve 32 rotates synchronously, and the first stationary ring 34 fits with the end face of the first moving ring 33 under the compensation action of the axial compensation mechanism, thereby forming a contact end face seal to achieve the purpose of sealing the cryogenic liquid oxygen. Moreover, through the setting of the first stationary ring seat 31, it is easier to disassemble and assemble the first stationary ring 34 to avoid the rotation of the stationary ring.

[0057] An optional implementation of this embodiment is as follows: the non-contact end face seal 4 includes a sealing housing 41, a second sleeve 42, a third sleeve 43, a compression sleeve 44, a second dynamic ring 45, a third dynamic ring 46, a second static ring 47 and a third static ring 48, wherein:

[0058] The sealing housing 41 is detachably mounted on the first stationary ring seat 31 . A second through hole is formed in the sealing housing 41 . The second through hole is communicated with the air inlet 21 .

[0059] The second sleeve 42 is sleeved on the outside of the rotating shaft 1 and is screwed on the first sleeve 32 . By screwing the second sleeve 42 on the first sleeve 32 , the structure is made more compact and stable.

[0060] The third shaft sleeve 43 is sleeved outside the rotating shaft 1 , so that when the rotating shaft 1 rotates, the second shaft sleeve 42 and the third shaft sleeve 43 sleeved outside the rotating shaft 1 are driven to rotate together.

[0061] The clamping sleeve 44 is detachably mounted on the third sleeve 43 and is pressed against the second sleeve 42 , and the second sleeve 42 and the third sleeve 43 are located at both ends of the clamping sleeve 44 . By setting the clamping sleeve 44 , the second sleeve 42 and the third sleeve 43 are pressed against the rotating shaft 1 .

[0062] The second moving ring 45 is connected to the second shaft sleeve 42 .

[0063] The third movable ring 46 is connected to the third shaft sleeve 43. When the rotating shaft 1 rotates, the second shaft sleeve 42 and the third shaft sleeve 43 sleeved on the rotating shaft 1 are driven to rotate together, so that the second movable ring 45 connected to the second shaft sleeve 42 and the third movable ring 46 connected to the third shaft sleeve 43 rotate synchronously.

[0064] The second stationary ring 47 is mounted on the sealing housing 41 through an axial compensation mechanism and is in contact with the second dynamic ring 45 .

[0065] The third stationary ring 48 is mounted on the sealing housing 41 through an axial compensation mechanism and is in contact with the third dynamic ring 46 .

[0066] Through the above structure, the sealing gas enters the second through hole through the air inlet hole 21 and then flows to both sides. When the rotating shaft 1 rotates, it drives the second sleeve 42, the third sleeve 43, the second movable ring 45 and the third movable ring 46 to rotate together. When the sealing gas flows through the end faces of the second movable ring 45 and the third movable ring 46, an air film is generated between the end faces of the second movable ring 45 and the second static ring 47 and between the end faces of the third movable ring 46 and the third static ring 48, forming a non-contact end face seal 4.

[0067] An optional implementation of this embodiment is as follows: the second contact seal includes a fourth sleeve 51, a fourth dynamic ring 52, a second stationary ring seat 53 and a fourth stationary ring 54, wherein:

[0068] The fourth sleeve 51 is sleeved on the outside of the rotating shaft 1 and is screwed on the third sleeve 43. By screwing the fourth sleeve 51 on the third sleeve 43, the structure is made more compact and stable.

[0069] The fourth movable ring 52 is connected to the fourth shaft sleeve 51 , so that the fourth shaft sleeve 51 rotates to drive the fourth movable ring 52 to rotate together.

[0070] The second stationary ring seat 53 is detachably mounted on the sealing housing 41 . A third through hole is formed on the second stationary ring seat 53 . The third through hole is communicated with the exhaust hole 22 .

[0071] The fourth stationary ring 54 is installed on the second stationary ring seat 53 through an axial compensation mechanism and is in contact with the fourth moving ring 52 .

[0072] Through the above structure, the cryogenic liquid oxygen and cryogenic methane are sealed by the first contact end face seal 3 and the second contact end face seal 5 to reduce the leakage of cryogenic liquid oxygen and cryogenic methane. The non-contact end face seal 4 is set to allow the sealing gas to enter from the air inlet 21, flow to both sides, and flow out from the end faces of the second static ring 47 and the second dynamic ring 45 and the third static ring 48 and the third dynamic ring 46. The leakage gas on the cryogenic liquid oxygen side and the cryogenic methane side flows out from the end faces of the first dynamic ring 33 and the first static ring 34 and the fourth dynamic ring 52 and the fourth static ring 54 respectively, so that the sealing gas meets the leakage gas on both sides and mixes, and is discharged from the two exhaust holes 22 respectively, thereby achieving the purpose of preventing the mixing of cryogenic liquid oxygen and cryogenic methane.

[0073] An optional implementation of the present embodiment is as follows: a comb tooth seal 6 is provided between the second sleeve 42 and the first stationary ring seat 31 and between the fourth sleeve 51 and the second stationary ring seat 53. The comb tooth seal 6 has good sealing performance, long service life, convenient maintenance and low cost. The sealing effect is further enhanced by the provision of the comb tooth seal 6.

[0074] An optional implementation of this embodiment is as follows: the axial compensation mechanism is a spring 7 .

[0075] An optional implementation of the present embodiment is as follows: the sealing housing 41 and the first stationary ring seat 31, the clamping sleeve 44 and the third shaft sleeve 43, and the sealing housing 41 and the second stationary ring seat 53 are all connected by set screws 8. In this way, the sealing housing 41 and the first stationary ring seat 31, the clamping sleeve 44 and the third shaft sleeve 43, and the sealing housing 41 and the second stationary ring seat 53 connected by the set screws 8 are easier to disassemble and assemble.

[0076] An optional implementation of the present embodiment is as follows: seals are provided between the first stationary ring 34 and the first stationary ring seat 31, as well as between the fourth stationary ring 54 and the fourth stationary ring 54 seat. Through the provision of the seals, not only the connection between the first stationary ring 34 and the first stationary ring seat 31, as well as the fourth stationary ring 54 and the fourth stationary ring 54 seat is made more secure, but also the probability of gas leakage is reduced.

[0077] Optionally, the sealing member is a C-shaped sealing ring 9, which has good sealing performance, strong adaptability and is easy to disassemble and assemble.

[0078] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A combined sealing structure for a gas turbine pump, comprising a rotating shaft (1), characterized in that: The invention also comprises a first contact end face seal (3), a second contact end face seal (5) and a non-contact end face seal (4) which are detachably mounted on the unit (2), wherein the first contact end face seal (3), the non-contact end face seal (4) and the second contact end face seal (5) are sequentially arranged in series on the rotating shaft (1), and the unit (2) is provided with an air inlet hole (21) and two air outlet holes (22), wherein the air inlet hole (21) is connected to the non-contact end face seal (4), and the two air outlet holes (22) are respectively connected to the first contact end face seal (3) and the second contact end face seal (5).

2. A combined sealing structure for a gas turbine pump according to claim 1, characterized in that: The first contact end face seal (3) comprises: A first stationary ring seat (31) is detachably mounted on the unit (2), wherein a first through hole is formed on the first stationary ring seat (31), and the first through hole is connected to any of the exhaust holes (22); A first sleeve (32) mounted on the rotating shaft (1); A first moving ring (33) connected to the first shaft sleeve (32); The first stationary ring (34) is installed on the first stationary ring seat (31) through an axial compensation mechanism, and the first stationary ring (34) is in contact with the first moving ring (33).

3. A combined sealing structure for a gas turbine pump according to claim 2, characterized in that: The first moving ring (33) is drivingly connected to the first shaft sleeve (32) via a pin.

4. A combined sealing structure for a gas turbine pump according to claim 3, characterized in that: The non-contact end face seal (4) comprises: A sealing shell (41) is detachably mounted on the first stationary ring seat (31), and a second through hole is provided on the sealing shell (41), and the second through hole is connected to the air inlet hole (21); A second sleeve (42) is sleeved outside the rotating shaft (1) and is screwed onto the first sleeve (32); A third shaft sleeve (43) sleeved outside the rotating shaft (1); A compression sleeve (44) is detachably mounted on the third shaft sleeve (43) and is compressed on the second shaft sleeve (42), and the second shaft sleeve (42) and the third shaft sleeve (43) are located at two ends of the compression sleeve (44); A second moving ring (45) connected to the second shaft sleeve (42); A third moving ring (46) connected to the third shaft sleeve (43); A second stationary ring (47) is mounted on the sealing housing (41) through an axial compensation mechanism and is in contact with the second moving ring (45); The third stationary ring (48) is mounted on the sealing housing (41) through an axial compensation mechanism and is in contact with the third moving ring (46).

5. A combined sealing structure for a gas turbine pump according to claim 4, characterized in that: The second contact seal comprises: A fourth shaft sleeve (51) is sleeved outside the rotating shaft (1) and is screwed onto the third shaft sleeve (43); A fourth moving ring (52) connected to the fourth shaft sleeve (51); A second stationary ring seat (53) is detachably mounted on the sealing housing (41), and a third through hole is formed on the second stationary ring seat (53), and the third through hole is connected to the exhaust hole (22); The fourth stationary ring (54) is mounted on the second stationary ring seat (53) through an axial compensation mechanism and is in contact with the fourth moving ring (52).

6. A combined sealing structure for a gas turbine pump according to claim 5, characterized in that: Comb seals (6) are provided between the second shaft sleeve (42) and the first stationary ring seat (31), and between the fourth shaft sleeve (51) and the second stationary ring seat (53).

7. A combined sealing structure for a gas turbine pump according to claim 6, characterized in that: The axial compensation mechanism is a spring (7).

8. A combined sealing structure for a gas turbine pump according to claim 7, characterized in that: The sealing housing (41) and the first stationary ring seat (31), the compression sleeve (44) and the third shaft sleeve (43), and the sealing housing (41) and the second stationary ring seat (53) are all connected via set screws (8).

9. A combined sealing structure for a gas turbine pump according to claim 8, characterized in that: Sealing elements are provided between the first stationary ring (34) and the first stationary ring seat (31), and between the fourth stationary ring (54) and the second stationary ring seat (53).

10. A combined sealing structure for a gas turbine pump according to claim 9, characterized in that: The sealing element is a C-shaped sealing ring (9).

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