High-pressure cavity controllable automatic disengagement type dynamic sealing device for engine turbine pump

Abstract

A high-pressure cavity controllable automatic disengaging type dynamic sealing device for an engine turbine pump comprises a sealing shell, a dynamic ring, a sealing shaft sleeve, a static ring assembly, a high-pressure cavity shell, a pushing pin and a spring, and the sealing shell is arranged on the outer side of the dynamic ring and the outer side of the sealing shaft sleeve in a sleeving mode; the static ring assembly is installed in the sealing shell and located on the side, facing the movable ring, of the sealing shell. Labyrinth seal is formed between the static ring assembly and the sealing shaft sleeve. The sealing shell is provided with a counter bore, and the spring is located in the counter bore and makes contact with the static ring assembly. The high-pressure cavity shell is installed on the sealing shell and located on the side, away from the sealing shell, of the static ring assembly, a plurality of installation holes are formed in the high-pressure cavity shell, the pushing pins are located in the installation holes, the high-pressure cavity shell is provided with connecting holes, the sealing shell is provided with an annular groove, the connecting holes communicate with the bottoms of the installation holes and the annular groove, and the sealing shell is provided with a high-pressure medium inlet. And the high-pressure medium inlet is communicated with the annular groove. A high-pressure medium is introduced from the back of the pump to push the pin to separate the static ring assembly from the movable ring, and is not limited by medium pressure before and after the movable seal.

Description

Technical Field

[0001] The invention relates to a controllable disengagement type dynamic sealing device for a high-pressure chamber of an engine turbine pump, belonging to the technical field of engine sealing. Background Art

[0002] As the core and foundation of my country's launch vehicles, liquid rocket engines have always supported and carried my country's ability to enter space. The reusable space transportation system has put forward higher requirements for the reliability, economy and maintainability of reusable engines. The turbopump is the core component of the rocket engine, and the dynamic seal is the key component of the turbopump. Its working reliability will affect the success or failure of the entire engine. With the increase of engine thrust, the speed, pressure and shaft diameter of the turbopump increase, which increases the technical difficulty of the dynamic seal of the turbopump, and the working reliability of the dynamic seal directly affects the reusability of the engine.

[0003] The dynamic seal of the turbine pump is mainly located between the pump chamber and the turbine chamber. The dynamic seal is set between the pump chamber and the turbine chamber. Its main function is to prevent the low temperature of the pump end from leaking into the turbine chamber when the low-temperature engine is precooled. When the engine is working, a small amount of leakage between the pump end and the turbine end can be allowed to increase the reliability of the dynamic seal. Due to the harsh dynamic sealing environment, the sealing surface of the contact seal is easily worn flat. In order to improve the reliability and reusability of the engine, a disengagement dynamic seal is used as a seal under high-speed and high-pressure conditions. The traditional active disengagement dynamic seal relies on the pressure difference between the pump chamber and the turbine chamber to achieve disengagement after starting. For the turbo pump working condition with a low pressure difference between the pump chamber and the turbine chamber, it is impossible to achieve sealing closure at the precooling end to ensure the sealing of the precooling medium. The engine starts and automatically disengages under the action of the pressure difference. Summary of the invention

[0004] The technical problem solved by the present application is: to overcome the deficiencies of the prior art and to provide a controllable detachable dynamic sealing device for a high-pressure chamber of an engine turbine pump, which meets the requirements of preventing the low-temperature medium at the pump end from leaking into the turbine chamber during the pre-cooling stage of a high-thrust, low-temperature reusable rocket engine and controlling the leakage of the main stage.

[0005] It can meet the requirement of achieving zero leakage of medium in the pre-cooling section pump chamber by end face sealing. After starting, the dynamic ring and static ring are separated by the action of the high-pressure chamber to prevent wear of the dynamic and static rings. The device for controlling main stage leakage is controlled by labyrinth sealing, which improves the reliability and reusability of dynamic seal.

[0006] The technical solutions provided by this application are as follows:

[0007] A high-pressure chamber controllable automatic disengagement type dynamic seal device for an engine turbine pump is used for sealing the turbine pump. The turbine pump includes a pump casing and a rotating shaft rotatably connected to the pump casing, including a sealing housing, a dynamic ring, a sealing sleeve, a static ring assembly, a high-pressure chamber casing, a pushing pin and a spring. The rotating shaft passes through the inner holes of the dynamic ring and the sealing sleeve and is fixedly connected to the dynamic ring and the sealing sleeve. The sealing housing is sleeved on the outer sides of the dynamic ring and the sealing sleeve. The static ring assembly includes a static ring seat, which is installed on the inner side of the sealing housing and is located on the side of the sealing housing facing the dynamic ring. Labyrinth teeth are arranged on the sealing sleeve, and a labyrinth seal is formed between the static ring seat and the sealing sleeve. A countersunk hole is arranged on the side of the sealing housing facing the dynamic ring. The spring is installed in the countersunk hole of the sealing housing, and one end of the spring contacts the static ring seat. The spring presses the static ring seat so that the static ring seat contacts the dynamic ring to form an end face seal; the high-pressure chamber housing is threadedly connected to the sealing housing and is located on the side of the static ring seat away from the sealing housing, and a plurality of mounting holes are provided on the surface of the high-pressure chamber housing facing the static ring seat, and the push pin is placed in the mounting hole of the high-pressure chamber housing, and the high-pressure chamber housing is provided with a connecting hole, and the surface of the sealing housing facing the high-pressure chamber housing is provided with an annular groove, one end of the connecting hole is connected to the bottom of the mounting hole, and the other end is connected to the annular groove, and the sealing housing is provided with a high-pressure medium inlet, and the high-pressure medium inlet is connected to the annular groove; the high-pressure medium inlet is passed through the high-pressure medium inlet, and the high-pressure medium enters the mounting hole through the annular groove and the connecting hole, and pushes the pin to move, and the push pin pushes the static ring seat to move and separate from the dynamic ring.

[0008] The invention also comprises a screw, which passes through the stationary ring seat and is threadedly connected with the sealing housing, and the stationary ring seat is slidably connected with the screw along the axis direction of the screw.

[0009] A secondary seal is arranged between the inner side of the sealing housing and the stationary ring seat, and the secondary seal is a sealing ring.

[0010] The inner side of the sealing shell is provided with a first inner hole and a second inner hole which are connected to each other. The sealing sleeve and the stationary ring seat both pass through the first inner hole and the second inner hole. The second inner hole is located on the side of the first inner hole facing the dynamic ring. The diameter of the second inner hole is larger than that of the first inner hole. The auxiliary sealing component is a sealing ring located in the second inner hole.

[0011] A gland is provided in the second inner hole of the sealing shell, the inner ring of the gland is inserted into the second inner hole, the outer ring of the gland extends in the radial direction of the sealing shell away from the stationary ring seat, the screw passes through the stationary ring seat and the gland in sequence, and is threadedly connected to the sealing shell.

[0012] The screw includes a smooth section connected to the nut and a threaded section connected to the end of the smooth section. The outer diameter of the smooth section is larger than the outer diameter of the threaded section. The outer diameter of the smooth section matches with the opening on the stationary ring seat so that the stationary ring seat can slide relative to the smooth section along the axis of the smooth section. The outer diameter of the threaded section matches with the opening on the pressure cover. The threaded section is threadedly connected to the sealing housing. The step surface between the smooth section and the threaded section presses the pressure cover and the sealing housing tightly.

[0013] The pushing pin is a cylindrical structure with a variable cross-section. The diameter of the middle position of the pushing pin is larger than the diameter of the two ends of the pushing pin. The middle position of the pushing pin cooperates with the installation hole, and the two ends of the pushing pin are round heads.

[0014] The sealing housing is threadedly connected with a countersunk screw, and the head of the countersunk screw is in contact with a side of the high-pressure chamber housing that is away from the stationary ring seat.

[0015] The stationary ring assembly also includes a graphite ring, which is connected to one end of the stationary ring seat facing the dynamic ring. The dynamic ring is sprayed with chromium oxide, and an end face seal is formed when the graphite ring contacts the dynamic ring.

[0016] The stationary ring assembly also includes a cladding silver layer, which is arranged on the inner ring of the stationary ring seat. The sealing sleeve is made of a high-temperature alloy material, and the cladding silver layer contacts the sealing sleeve to form a labyrinth seal.

[0017] In summary, this application at least includes the following beneficial technical effects:

[0018] (1) The present invention provides a controllable disengageable dynamic seal device for a high-pressure chamber of an engine turbine pump, which can prevent the precooling medium from leaking into the turbine chamber during the precooling stage of a large thrust engine turbine pump, and automatically disengage when the engine is started. It can be disengaged at low speed to achieve zero seal wear, thereby improving the working reliability of the dynamic seal. At the same time, the disengageable dynamic seal can achieve zero consumption of the isolation gas of the engine during precooling, and meet the sealing performance requirements during precooling. The labyrinth seal used meets the requirements of engine working throttling and maintaining the end face seal disengaged state;

[0019] (2) The present invention provides a high-pressure chamber controllable disengagement type dynamic seal device for an engine turbine pump. The device is not restricted by the pressure of the medium before and after the dynamic seal, and is automatically disengaged. This makes it more adaptable than traditional seals that automatically disengage by relying on the pressure of the medium before and after the seal.

[0020] (3) The present invention provides a high-pressure chamber controllable disengageable dynamic seal device for an engine turbo pump, which can control the disengagement speed of the disengageable seal by adjusting the size and number of pins and the high-pressure chamber pressure.

[0021] (4) The present invention provides a controllable disengageable dynamic sealing device for a high-pressure chamber of an engine turbine pump, which adopts a balanced end face sealing structure. Compared with the traditional over-balanced end face sealing structure, the sealing pressure of the pre-cooling medium is not limited, and the medium sealing under overload conditions can be achieved, and it can be quickly opened at startup. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Assembly drawing for the detachable seal device;

[0023] Figure 2 This is the flow path diagram of the detachable seal high pressure chamber;

[0024] Figure 3 It is a schematic diagram of the static ring assembly;

[0025] Figure 4 It is a schematic diagram of the disengagement gap of the disengagement type seal;

[0026] Figure 5 It is the structural diagram of the high pressure chamber shell;

[0027] Figure 6 This is a schematic diagram of the structure in which the sealing device is installed on the turbine pump.

[0028] Description of the accompanying figures: 1. Stationary ring assembly; 2. Auxiliary seal; 3. Sealing housing; 4. Gland; 5. High-pressure chamber housing; 6. Push pin; 7. Spring; 8. Screw; 9. Countersunk screw; 10. Moving ring; 11. Sealing sleeve;

[0029] 12. Stationary ring seat; 13. Graphite ring; 14. Overlaying silver layer;

[0030] 51. Mounting hole; 52. Connection hole;

[0031] 01. Pump casing; 02. Rotating shaft. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] The embodiment of the present application discloses a high-pressure chamber controllable automatic disengagement dynamic seal device for an engine turbo pump, which is used for sealing the turbo pump. The turbo pump includes a pump housing 01 and a rotating shaft 02 rotatably connected to the pump housing. Figure 1 , Figure 2 As shown, the sealing device includes a stationary ring assembly 1, a secondary seal 2, a sealing housing 3, a gland 4, a high-pressure chamber housing 5, a push pin 6, a spring 7, a screw 8, a countersunk screw 9, a dynamic ring 10 and a sealing sleeve 11.

[0034] The moving ring 10 and the sealing sleeve 11 are sleeved on the outside of the rotating shaft and fixed to the rotating shaft by nuts so that the moving ring 10 and the sealing sleeve 11 rotate together with the rotating shaft. The sealing housing 3 is sleeved on the outside of the moving ring 10 and the sealing sleeve 11. The sealing housing 3 and the moving ring 10 and the sealing sleeve 11 are sealed by the stationary ring assembly 1. One end of the sealing housing 3 is sealed with the pump housing. The side of the sealing housing 3 facing the pump housing 01 is the pump end sealing chamber, and the other side is the turbine end leakage chamber.

[0035] like Figure 3As shown, the stationary ring assembly 1 includes a stationary ring seat 12, a graphite ring 13 and a cladding silver layer 14. The stationary ring seat is installed inside the sealing housing 3 and is located on the side of the sealing housing 3 facing the dynamic ring 10. The cladding silver layer is arranged on the inner ring of the stationary ring seat. The cladding silver layer contacts the sealing sleeve 11 to form a labyrinth seal. The graphite ring is connected to one end of the stationary ring seat facing the dynamic ring 10 so that the graphite ring forms an end face seal when in contact with the dynamic ring 10. The dynamic ring 10 is a metal material coated with a chromium oxide coating, and the secondary seal 2 adopts a spring energy storage seal ring structure.

[0036] A portion of the stationary ring seat is located between the inner ring of the sealing housing 3 and the outer ring of the sealing sleeve 11 , and the end of the stationary ring seat close to the dynamic ring 10 extends away from the sealing sleeve 11 . This portion is located on the side of the sealing housing 3 facing the dynamic ring 10 .

[0037] A countersunk hole is provided on the side of the sealing housing 3 facing the dynamic ring 10, and a spring 7 is installed in the countersunk hole of the sealing housing 3. The other end of the spring 7 contacts the stationary ring seat, so that the spring 7 presses the stationary ring seat to make the stationary ring seat contact and seal with the dynamic ring 10. This seal ensures complete sealing between the pump end sealing chamber and the turbine end leakage chamber on both sides of the sealing device.

[0038] The sealing housing 3 has a first inner hole and a second inner hole in communication in the middle, and the sealing sleeve 11 and the stationary ring seat both pass through the first inner hole and the second inner hole. The second inner hole is located on the side of the first inner hole facing the dynamic ring 10, and the diameter of the second inner hole is larger than the first inner hole. The auxiliary seal 2 is a sealing ring, which is placed between the stationary ring seat and the sealing housing 3, and the auxiliary seal 2 is located in the second inner hole and contacts the stepped surface between the first inner hole and the second inner hole; the gland 4 is annular, and the inner ring of the gland 4 is inserted into the second inner hole, and the outer ring of the gland 4 extends along the radial direction of the sealing housing 3 away from the stationary ring seat. The screw 8 passes through the stationary ring seat and the gland 4 in sequence and is threadedly connected to the sealing housing 3. The screw 8 includes a smooth section connected to the nut and a threaded section connected to the end of the smooth section. The outer diameter of the smooth section is larger than the outer diameter of the threaded section. The outer diameter of the smooth section matches the opening on the stationary ring seat so that the stationary ring seat can slide relative to the smooth section along the axis of the smooth section. The outer diameter of the threaded section matches the opening on the gland 4. The threaded section is threadedly connected to the sealing housing 3. The step surface between the smooth section and the threaded section presses the gland 4 and the sealing housing 3 tightly. The axial position of the secondary seal 2 is limited by the gland 4 so that the position of the secondary seal 2 in the second inner hole is stable, and the secondary seal 2 seals the stationary ring seat and the sealing housing 3. A gasket is provided between the step surface between the smooth section and the threaded section and the gland 4 to prevent loosening. At the same time, the screw 8 starts the anti-rotation effect on the stationary ring seat.

[0039] The countersunk screw 9 is threadedly installed on the sealing housing 3, and the head of the countersunk screw 9 presses the high-pressure chamber housing 5, so that the high-pressure chamber housing 5 is stably installed on the sealing housing 3, playing a role in preventing loosening.

[0040] like Figure 5 As shown, the outer circumferential position of the high-pressure chamber shell 5 is connected to the sealing shell 3 by threads, the high-pressure chamber shell 5 is located on the side of the static ring seat 12 away from the sealing shell 3, and a plurality of mounting holes 51 are provided on the surface of the high-pressure chamber shell 5 facing the static ring seat, and the push pin 6 is placed in the mounting hole of the high-pressure chamber shell 5. The high-pressure chamber shell 5 is provided with a connecting hole 52, one end of the connecting hole is connected to the bottom of the mounting hole, and the other end is located on the outer circumferential surface of the high-pressure chamber shell 5, and the surface of the sealing shell 3 facing the outer circumferential surface of the high-pressure chamber shell 5 is provided with an annular groove, and the annular groove and the mounting hole are located on the end of the outer circumferential surface of the high-pressure chamber shell 5, so that the annular groove is connected with the mounting hole, and the sealing shell 3 is provided with at least one high-pressure medium inlet, which is connected with the annular groove. The high-pressure medium introduced from the other high-pressure parts of the turbine pump flows in from the high-pressure medium inlet, and the high-pressure medium passes through the high-pressure medium inlet, the ring groove, the connecting hole, and finally enters the mounting hole. The high-pressure medium causes a pressure difference between the two ends of the push pin 6, and the push pin 6 is pushed to move, and the push pin 6 then pushes the static ring seat to move to the side close to the sealing housing 3, so that the static ring seat and the dynamic ring 10 are automatically separated. When the static ring seat is separated from the dynamic ring 10, the cover sealing device only has a labyrinth seal between the static ring seat and the sealing sleeve 11. At this time, since there is only a labyrinth seal and there is a small gap between the static ring seat and the sealing sleeve 11, the labyrinth seal allows the fluid to flow between the pump end sealing chamber and the turbine end leakage chamber, but the flow rate is very small. When the static ring seat contacts the dynamic ring 10, there is a disengagement gap between the static ring seat and the sealing housing 3. The disengagement gap is the distance that the static ring seat can move along the axial direction of the screw 8. The disengagement gap is about 1.5mm. Figure 4 shown.

[0041] The disengagement speed of the disengagement seal is controlled by the number and diameter of the pushing pins 6 and the pressure of the introduced high-pressure medium. In this patent, the number of pushing pins 6 is 12, with a diameter of 6 mm. The pressure of the high-pressure medium is introduced from the impeller outlet, and the pressure is about 10 MPa.

[0042] The push pin 6 adopts a cylindrical structure with a variable cross-section, and the two ends are designed with round heads, which is helpful to form an effective pressure difference area, and is not easy to get stuck when pushing the stationary ring seat 12. Along the axis direction of the mounting hole, the middle position of the push pin 6 has the largest diameter, and the middle position cooperates with the mounting hole, that is, the outer wall of the middle position of the push pin 6 contacts the inner wall of the mounting hole, so that the fluid at both ends of the push pin 6 can form a pressure difference.

[0043] The end face seal is a balanced structure. During precooling, the medium pressure in the pump chamber does not generate a force to open the static ring assembly 1. The dynamic ring 10 and the static ring seat are both in a closed state under the action of the spring 7.

[0044] The implementation principle is further explained below in conjunction with specific embodiments:

[0045] like Figure 1 and Figure 2 As shown, the spring 7 is placed in the hole of the sealing housing 3, the auxiliary seal 2 is placed in the inner hole of the sealing housing 3, the pressure cover 4 is installed on the left end surface of the sealing housing 2, the stationary ring assembly 1 is installed from the left end, the spring 7 is compressed, and is inserted from the inner hole of the auxiliary seal 2, the screw 8 is installed on the outer end surface of the stationary ring assembly, the cover plate 4 and the sealing housing 3 are pressed tightly, and are assembled into an assembly.

[0046] The push pin 6 is installed into the high-pressure chamber housing 5 , the high-pressure chamber housing 5 is screwed into the sealing housing 3 , and the countersunk screw 9 is installed in the sealing housing 3 .

[0047] In the disengagement type dynamic seal device, when the engine is precooled, the spring 7 applies an axial force to the stationary ring assembly 1, so that the end faces of the stationary ring assembly 1 and the dynamic ring 10 can fit together and maintain a certain sealing pressure ratio, thereby preventing the precooling medium from leaking from the pump end sealing chamber to the turbine end leakage chamber during precooling. After the engine is started, a high-pressure liquid is introduced from the impeller high-pressure medium into the high-pressure chamber housing 5 to form a high-pressure chamber, and the push pin 6 pushes the stationary ring assembly 1 and the dynamic ring 10 to separate under the pressure of the high-pressure chamber and the sealing chamber. At this time, the labyrinth seal formed by the stationary ring assembly 1 and the sealing sleeve 11 starts the throttling effect, limiting the leakage of the precooling medium from the pump end to the turbine end, and controlling the leakage amount. When the engine is shut down, the pressure in the high-pressure chamber decreases, and the stationary ring assembly 1 is closed again and effectively sealed under the force of the spring 7, thereby achieving repeated starting of the engine.

[0048] The end face seal of the disengageable dynamic seal adopts a balanced design, the medium pressure does not generate a force to open the static ring assembly 1, and is not affected by the medium pressure in the precooling state, so the end face seal can be effectively sealed.

[0049] The main seal of the detachable dynamic seal is the end face seal formed between the dynamic ring 10 and the stationary ring assembly 1, which adopts hard-to-soft sealing materials. The dynamic ring 10 adopts sprayed chromium oxide, and the stationary ring assembly adopts an embedded graphite ring structure, and its graphite material must have high impact resistance.

[0050] The labyrinth seal of the disengageable seal is formed by a stationary ring assembly 1 and a sealing sleeve 11, and a labyrinth tooth is arranged on the sealing sleeve 11. In order to prevent hard-to-hard collision, the sealing sleeve 11 is made of high-temperature alloy material, and the contact position between the stationary ring seat and the sealing sleeve 11 is made of surfacing silver layer material.

[0051] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0052] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. A high-pressure chamber controllable automatic disengagement dynamic sealing device for an engine turbo pump, used for sealing a turbo pump, the turbo pump comprising a pump housing and a rotating shaft rotatably connected to the pump housing, characterized in that: It comprises a sealing housing (3), a moving ring (10), a sealing sleeve (11), a stationary ring assembly (1), a high-pressure chamber housing (5), a pushing pin (6) and a spring (7); the rotating shaft passes through the inner holes of the moving ring (10) and the sealing sleeve (11) and is fixedly connected to the moving ring (10) and the sealing sleeve (11); the sealing housing (3) is sleeved on the outer sides of the moving ring (10) and the sealing sleeve (11); The stationary ring assembly (1) comprises a stationary ring seat (12) and a graphite ring (13). The stationary ring assembly (1) is installed inside the sealing housing (3) and is located on the side of the sealing housing (3) facing the moving ring (10). Labyrinth teeth are arranged on the sealing sleeve (11), and a labyrinth seal is formed between the stationary ring assembly (1) and the sealing sleeve (11). A countersunk hole is provided on one side of the sealing housing (3) facing the moving ring (10), a spring (7) is installed in the countersunk hole of the sealing housing (3), one end of the spring (7) contacts the stationary ring seat, and the spring (7) presses the stationary ring seat tightly so that the stationary ring seat contacts the moving ring (10) to form an end face seal; The high-pressure chamber housing (5) is mounted on the sealing housing (3) and is located on the side of the stationary ring seat (12) facing away from the sealing housing (3). A plurality of mounting holes (51) are provided on the surface of the high-pressure chamber housing (5) facing the stationary ring seat. The push pins (6) are placed in the mounting holes (51). The high-pressure chamber housing (5) is provided with a connecting hole (52). The surface of the sealing housing (3) facing the high-pressure chamber housing (5) is provided with an annular groove. One end of the connecting hole is connected to the bottom of the mounting hole and the other end is connected to the annular groove. The sealing housing (3) is provided with a high-pressure medium inlet, which is connected to the annular groove. When the high-pressure medium is introduced from the high-pressure medium inlet, the high-pressure medium will enter the mounting hole through the ring groove and the connecting hole, and push the pin (6) to move, and the pin (6) pushes the stationary ring assembly (1) to move and separate from the dynamic ring (10).

2. The high-pressure chamber controllable automatic disengagement type dynamic sealing device for an engine turbo pump according to claim 1, characterized in that: It also includes a screw (8), which passes through the stationary ring seat and is threadedly connected to the sealing housing (3), and the stationary ring assembly (1) is slidably connected to the screw (8) along the axial direction of the screw (8).

3. A controllable automatic disengagement type dynamic sealing device for a high pressure chamber of an engine turbo pump according to claim 1 or 2, characterized in that: A secondary seal (2) is provided between the inner side of the sealing housing (3) and the stationary ring assembly (1), and the secondary seal (2) is a sealing ring.

4. The high-pressure chamber controllable automatic disengagement type dynamic sealing device for an engine turbo pump according to claim 3, characterized in that: The inner side of the sealing shell (3) is provided with a first inner hole and a second inner hole which are connected to each other. The stationary ring assembly (1) passes through the first inner hole and the second inner hole. The second inner hole is located on the side of the first inner hole facing the dynamic ring (10). The diameter of the second inner hole is larger than that of the first inner hole. The auxiliary sealing component (2) is a sealing ring located in the second inner hole.

5. The high-pressure chamber controllable automatic disengagement type dynamic sealing device for an engine turbo pump according to claim 4, characterized in that: A gland (4) is provided in the second inner hole of the sealing housing (3); the inner ring of the gland (4) is inserted into the second inner hole; the outer ring of the gland (4) extends in a radial direction of the sealing housing (3) away from the stationary ring seat; the screw (8) passes through the stationary ring seat and the gland (4) in sequence and is threadedly connected to the sealing housing (3).

6. The high-pressure chamber controllable automatic disengagement type dynamic sealing device for an engine turbo pump according to claim 5, characterized in that: The screw (8) comprises a smooth section connected to the nut and a threaded section connected to the end of the smooth section. The outer diameter of the smooth section is larger than the outer diameter of the threaded section. The outer diameter of the smooth section matches the opening on the stationary ring seat so that the stationary ring seat can slide relative to the smooth section along the axis of the smooth section. The outer diameter of the threaded section matches the opening on the gland (4). The threaded section is threadedly connected to the sealing housing (3). The step surface between the smooth section and the threaded section presses the gland (4) and the sealing housing (3) tightly.

7. The high-pressure chamber controllable automatic disengagement type dynamic sealing device for an engine turbo pump according to claim 1, characterized in that: The pushing pin (6) is a cylindrical structure with a variable cross-section. The diameter of the middle portion of the pushing pin (6) is larger than the diameter of the two ends of the pushing pin (6). The middle portion of the pushing pin (6) cooperates with the mounting hole, and the two ends of the pushing pin (6) are round heads.

8. The high-pressure chamber controllable automatic disengagement type dynamic sealing device for an engine turbo pump according to claim 1, characterized in that: The sealing housing (3) is threadedly connected with a countersunk screw (9), the head of which contacts the side of the high-pressure chamber housing (5) facing away from the stationary ring seat (12), and the countersunk screw (9) prevents the threaded connection between the high-pressure chamber housing (5) and the sealing housing (3) from loosening.

9. The high-pressure chamber controllable automatic disengagement type dynamic sealing device for an engine turbo pump according to claim 1, characterized in that: The stationary ring assembly (1) further comprises a graphite ring (13), the graphite ring (13) being connected to one end of the stationary ring seat facing the moving ring (10), the moving ring (10) being sprayed with chromium oxide, and an end face seal being formed when the graphite ring (13) contacts the moving ring (10).

10. The high-pressure chamber controllable automatic disengagement type dynamic sealing device for an engine turbo pump according to claim 1, characterized in that: The stationary ring assembly (1) further comprises a cladding silver layer (14), which is arranged on the inner ring of the stationary ring seat. The sealing sleeve (11) is made of a high-temperature alloy material, and the cladding silver layer (14) contacts the sealing sleeve (11) to form a labyrinth seal.

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