1. The high-speed helium end face seal test device for the liquid rocket engine turbo pump is characterized by comprising a shell (1), a main shaft (4), a front bearing (11), a rear bearing (12), a front bearing gland (10), a front shaft seal (3), a front shaft seal gland (2), a static ring assembly (20), a shaft sleeve (21), an adjusting shaft sleeve (23), a movable ring (22), a front locking nut (13), a front end cover (14), a rear bearing gland (5), a spacer ring (19), an adjusting gasket (17), an adjusting shaft sleeve (23), a rear locking nut (7), a rear shaft seal (9), a rear gland (8) and a rear end cover (6);

the main shaft (4) is positioned in the shell (1) and is supported by a front bearing (11) and a rear bearing (12); the front bearing (11) is fastened on the shell (1) through a front bearing gland (10);

the front end of the main shaft (4) is provided with a shaft sleeve (21) and a movable ring (22), and the shaft sleeve (21) is positioned among the front bearing (11), the adjusting shaft sleeve (23) and the movable ring (22); the front lock nut (13) is connected with the front end of the main shaft (4) and is used for fixing the movable ring gasket (24), the movable ring (22), the adjusting shaft sleeve (23) and the shaft sleeve (21) on the main shaft (4);

the static ring assembly (20) penetrates through the shaft sleeve (21) and the main shaft (4) and is fastened on the shell (1), and a sealing cavity is formed between the static ring assembly (20) and the front end cover (14);

a discharge cavity is formed between the front shaft seal gland (2) and the static ring component (20);

the front bearing gland (10) is fastened on the shell (1);

the rear bearing (12) is fastened on the shell (1) through a rear bearing gland (5); adjusting gaskets (17) with different thicknesses are arranged between the rear bearing (12) and the rear bearing gland (5) and used for applying axial assembling pretightening force of the front bearing (11) and the rear bearing (12) and eliminating axial play of the bearings;

a rear locking nut (7) is arranged at the rear end of the main shaft (4), and the rear locking nut (7) is positioned between the rear bearing (12) and the rear end cover (6) and used for fastening the inner ring of the rear bearing (12) on the main shaft (4);

the rear end cover (6) is fastened on the shell (1), and a sealing gasket (16) is arranged between the rear end cover (6) and the shell (1); a bearing cavity is formed between the front oil seal gland (2) and the rear end cover (6), a cooling liquid inlet communicated with the bearing cavity is processed at the position, close to the front bearing (11), of the front end of the shell (1), and a cooling liquid outlet communicated with the bearing cavity is processed at the position, close to the uppermost part of the rear bearing (12), of the rear end of the shell (1); the main shaft (4) penetrates out of the rear end cover (6) and is connected with an output shaft of an external power driving device.

2. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 1, characterized in that a front end cover (14) is fastened on the casing (1), and a sealing gasket (15) is arranged between the front end cover (14) and the casing (1).

3. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 1, wherein the test device comprises a seal cavity, a discharge cavity and a bearing cavity, a static ring component (20) and a moving ring (22) form a seal component, and the seal component and a front end cover form a seal cavity; the static ring assembly (20), the shell (1) and the front bearing gland (10) form a discharge cavity; the front bearing gland (10) and the rear end cover (6) form a bearing cavity.

4. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 3, wherein a sealing gasket is arranged at a front end cover of the sealing cavity to seal the sealing cavity.

5. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 3, wherein the front end of the bearing cavity is sealed by the combination of an O-ring and a front shaft seal, and the rear end is sealed by a rear shaft seal.

6. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 3, wherein the seal cavity is provided with a medium inlet, a pressure measurement interface and a temperature measurement interface.

7. The high-speed helium end face seal test device for the liquid rocket engine turbine pump according to claim 3, wherein the bearing cavity is provided with a cooling liquid inlet and a cooling liquid outlet.

8. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 3, wherein the venting cavity is provided with a gas venting port and a liquid venting port.

9. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 1, characterized in that a moving ring gasket (24) is arranged between the front lock nut (13) and the moving ring (22).

10. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 1, is characterized in that a static ring gasket (25) is arranged between the static ring assembly (20) and the casing (1) and is used for adjusting the compression amount of the static ring assembly (20) and realizing sealing.

11. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 1, characterized in that three through holes are processed on a front end cover (14) communicated with the seal cavity, one through hole is used as a medium inlet and is provided with a flow meter for measuring inlet flow, and the other two through holes are respectively used for measuring the pressure and the temperature of the seal cavity.

12. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 1, characterized in that three through holes are processed at the position of the shell (1) communicated with the leakage cavity, and are respectively used for measuring the pressure of the leakage cavity, the gas leakage port and the liquid leakage port.

13. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 1, characterized in that the spacer ring (19) is an end face for installing the front shaft seal (3), and an O-shaped ring groove is designed on the spacer ring (19).

14. The high-speed helium end face seal test device for the liquid rocket engine turbo pump according to claim 1, characterized in that an annular groove is processed on the rear end cover (6), a rear shaft seal (9) is installed in the annular groove, and the rear end cover (8) is fixed on the rear end cover (6) through the rear shaft seal.

Background

The turbopump is the core power component of the liquid rocket engine and is also the most complex component in the whole engine. The end face seal is a key component for isolating different working media in the turbine pump and is vital to the safe operation and function realization of the turbine pump; the reliability of the face seal is the basis for the reliability of the engine.

The helium end face seal is used for isolating the contact between liquid oxygen and liquid hydrogen in the turbopump and preventing the explosion after the contact between the liquid oxygen and the liquid hydrogen. Under the condition of high rotating speed, the sealing performance of helium end face sealing is related to factors such as pressure, rotating speed, rigidity of a static ring diaphragm box, compression amount of a static ring and the like.

The helium end face seal test device simulates the working environment of an engine turbine pump and judges the sealing performance and structural rationality of an end face seal product by working medium, working speed, seal cavity pressure and leakage amount. The test device needs to have good structural performance and sealing performance in a high-speed state, and the reliability and stability of the test device need to be considered during design. At present, no helium end face sealing test device suitable for the high-rotating-speed condition exists.

Disclosure of Invention

The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the high-speed helium end face sealing test device for the liquid rocket engine turbine pump is provided, and helium end face sealing under the high-rotating-speed condition is realized.

The technical scheme of the invention is as follows:

a high-speed helium end face seal test device for a liquid rocket engine turbine pump comprises a shell, a main shaft, a front bearing, a rear bearing, a front bearing gland, a front shaft seal gland, a static ring assembly, a shaft sleeve, an adjusting shaft sleeve, a movable ring, a front locking nut, a front end cover, a rear bearing gland, a spacer ring, an adjusting gasket, an adjusting shaft sleeve, a rear locking nut, a rear shaft seal gland and a rear end cover;

the main shaft is positioned in the shell and supported by a front bearing and a rear bearing; the front bearing is fastened on the shell through a front bearing gland;

the front end of the main shaft is provided with a shaft sleeve and a movable ring, and the shaft sleeve is positioned among the front bearing, the adjusting shaft sleeve and the movable ring; the front locking nut is connected with the front end of the main shaft and is used for fixing the movable ring gasket, the movable ring, the adjusting shaft sleeve and the shaft sleeve on the main shaft;

the static ring assembly penetrates through the shaft sleeve and the main shaft and is fixedly fastened on the shell, and a sealing cavity is formed between the static ring assembly and the front end cover;

the front end cover is fastened on the shell, and a sealing gasket is arranged between the front end cover and the shell;

a discharge cavity is formed between the front shaft seal gland and the static ring component;

the front bearing gland is fastened on the shell;

the rear bearing is fastened on the shell through a rear bearing gland; adjusting gaskets with different thicknesses are arranged between the rear bearing and the rear bearing gland and used for applying axial assembling pretightening force of the front bearing and the rear bearing and eliminating axial play of the bearings;

the rear end of the main shaft is provided with a rear lock nut which is positioned between the rear bearing and the rear end cover and used for fastening the inner ring of the rear bearing on the main shaft;

the rear end cover is fastened on the shell, and a sealing gasket is arranged between the rear end cover and the shell; a bearing cavity is formed between the front oil seal gland and the rear end cover, a cooling liquid inlet communicated with the bearing cavity is processed at the position of the front end of the shell close to the front bearing, and a cooling liquid outlet communicated with the bearing cavity is processed at the position of the rear end of the shell close to the uppermost part of the rear bearing; the main shaft penetrates out of the rear end cover and is connected with an output shaft of an external power driving device.

Furthermore, the front end cover is fastened on the shell, and a sealing gasket is arranged between the front end cover and the shell.

Furthermore, the test device comprises a sealing cavity, a discharge cavity and a bearing cavity, wherein the static ring assembly and the dynamic ring form a sealing assembly, and the sealing assembly and the front end cover form the sealing cavity; the static ring assembly, the shell and the front bearing gland form a discharge cavity; the front bearing gland and the rear end cap form a bearing cavity.

Furthermore, a sealing gasket is arranged on the front end cover of the sealing cavity to seal the sealing cavity.

Furthermore, the front end of the bearing cavity is sealed by the combination of an O-shaped ring and a front shaft seal, and the rear end of the bearing cavity is sealed by a rear shaft seal.

Furthermore, the sealed cavity is provided with a medium inlet, a pressure measurement interface and a temperature measurement interface.

Further, the bearing cavity is provided with a cooling liquid inlet and a cooling liquid outlet.

Further, the discharge cavity is provided with a gas discharge port and a liquid discharge port.

Furthermore, a movable ring gasket is arranged between the front lock nut and the movable ring.

Furthermore, a static ring gasket is arranged between the static ring assembly and the shell, so that the compression amount of the static ring assembly is adjusted, and sealing is realized.

Furthermore, three through holes are processed on a front end cover communicated with the sealing cavity, one through hole is used as a medium inlet and is provided with a flowmeter for measuring inlet flow, and the other two through holes are respectively used for measuring the pressure and the temperature of the sealing cavity.

Furthermore, three through holes are processed at the position of the shell communicated with the leakage cavity and are respectively used for measuring the pressure of the leakage cavity, the gas leakage port and the liquid leakage port.

Furthermore, the spacer ring is an end face for installing the front shaft seal, and an O-shaped ring groove is designed on the spacer ring.

Furthermore, an annular groove is processed on the rear end cover, a rear shaft seal is installed in the annular groove, and the rear end cover is fixed on the rear end cover through the rear shaft seal.

Compared with the prior art, the invention has the beneficial effects that:

(1) the test device has strong functionality and good performance in a high-speed state, can be used for performing a helium end face static ring running test and a dynamic ring sampling test, can be used for verifying the sealing performance of a static ring component by using a process dynamic ring, and can also be used for checking the structural reasonability of the dynamic ring by using the process static ring;

(2) the test device of the invention designs the main shaft as a rigid shaft, so that the working rotating speed of the main shaft avoids the first-order critical rotating speed, and the sufficient rigidity and stability are ensured;

(3) the front end cover is designed into a convex shape, so that the length and the weight of the shell can be reduced; the design of 3 welding filler necks is adopted, so that the thickness and the weight of the end cover are reduced;

(4) the process seal at high rotating speed of the invention adopts the combination of the shaft seal and the O-shaped ring to ensure that the cooling medium does not leak, thus reducing the test cost;

(5) the testing device is provided with the flowmeter at the medium inlet, and the measured leakage amount is accurate and reliable by adopting the principle that the amount of the medium entering is equal to the leakage amount of the sealing component;

(6) when the static ring assembly is assembled, a special tool is arranged for processing a fastening bolt, the tightening torque is a fixed value, and the assembling torque of the static ring assembly is ensured to be the fixed value; when the movable ring of the engine is assembled, a front lock nut is adopted to fasten the movable ring, the tightening torque of the lock nut is a fixed value, and the movable ring is not only guaranteed to be compressed, but also the plane of the movable ring is not deformed;

(7) the test device has the advantages of high coaxial precision, reasonable structure and convenient assembly. The machining precision of the main shaft, the shell and the key matching surfaces of parts assembled on the main shaft is required to be 0.8 grade, and the form and position tolerance is required to be less than 0.02mm, so that the coaxiality precision of the main shaft of the testing device and the driving shaft of the testing table is ensured.

(8) The helium end face seal test device for the liquid rocket engine oxygen turbine pump is high in machining precision, reasonable in structure and strong in stability in a high-speed state, is put into use at present, completes a multi-batch helium end face seal running-in test, a sampling test and a research test, and is good in use effect.

Drawings

FIG. 1 is an assembly view of the present invention.

Detailed Description

The invention is further illustrated by the following examples.

In order to carry out high-speed helium end face seal running-in tests, sampling tests and research tests for a liquid rocket engine turbine pump and detect the sealing performance between a static ring assembly and a moving ring, the invention designs a test device.

Helium end face sealing products (a static ring component and a moving ring) are assembled in the test device according to the compression amount and the assembly procedure of the technical requirements, then normal-temperature air tightness inspection is carried out, the test device is installed on a test bench after the test device is qualified, and measurement test equipment is installed after a medium pipeline and a cooling and lubricating system are connected. According to the technical conditions, a cooling and lubricating device is started for a medium with rated working pressure of a sealing cavity, a power system is driven, the working environment of an engine turbine pump is simulated, the sealing performance and the structural reasonableness of a helium sealing assembly product are examined, and the sealing performance of the sealing assembly product can be quantitatively detected.

The technical scheme provided by the invention is further explained by combining the attached drawing 1:

the structure of the helium end face seal test device for the liquid rocket engine oxygen turbine pump is shown in figure 1. The bearing comprises a main shaft 4, a shell 1, a front bearing 11, a rear bearing 12, a front bearing gland 10, a front shaft seal gland 2, a rear bearing gland 5, a front lock nut 13, a front end cover 14 and a rear end cover 6.

The design of the main shaft comprises the steps of firstly determining the diameter size of the front end of the main shaft and the size of a cantilever according to the size of a static ring product, determining the sizes of a front bearing and a rear bearing, and determining the main shaft to be a rigid shaft through simulation calculation of critical rotating speed.

The main shaft 4 is positioned in the shell 1 and is supported by a front bearing 11 and a rear bearing 12; the front bearing 11 is fastened to the housing 1 by a front bearing cover 10.

The design of the shell comprises the steps that firstly, the fit size of the shell and a product is determined according to the installation size of a static ring product; the design of casing middle part has locating surface and 8 through-holes to be used for fixing the casing at the test bench, and 2 screw top screw holes in addition make things convenient for the casing to dismantle.

The front end cover is designed to adopt a convex structure: the weight of the shell is reduced as much as possible, the length of the end cover is increased, and the weight of the shell is reduced; the front end cover has three interfaces: and feeding a medium, and measuring the pressure and the temperature of the sealed cavity.

The design of fore bearing gland has dual function, and first can set up the fore bearing outer lane, and the second can pass through the coolant liquid at 6 through-holes of circumferencial direction equipartition. The length of a cantilever of the main shaft can be shortened by the structure, so that the total length of the main shaft is reduced, and the length of the shell is reduced, so that the overall structure of the testing device is more reasonable.

The design of the spacer ring has double functions, namely firstly, the spacer ring is provided with an O-shaped ring groove for installation, and secondly, the spacer ring is also provided with an end face for installing the front shaft seal.

The shaft sleeve design has dual functions, firstly fixes the front bearing inner ring, and secondly can change different shaft sleeves for adjustment when the static ring assembly needs a large change in compression amount.

The front shaft seal gland has double functions, namely firstly fixing the front shaft seal and then fastening the O-shaped ring, so that the shaft seal and the O-shaped ring have sealing functions at the same time.

The design of the front lock nut has 3 functions, the first function is to fasten the bearing through the shaft sleeve and the movable ring, the second function is to guarantee the axial seal through the sealing function, and the third function is to guarantee the fixed value of the torque for fastening the movable ring through a special torque wrench.

The design of adjustment axle sleeve has different thickness, can obtain the different compressional capacity of quiet ring subassembly through changing different adjustment axle sleeves.

The static ring gasket has a dual function, and first has a sealing function, and the second can obtain different compression amounts of the static ring assembly by changing the static ring gasket with different thicknesses.

The adjusting gaskets have different thicknesses, and the proper pretightening force of different bearings can be obtained by changing the different adjusting gaskets.

And the rear shaft seal can axially seal the rear end of the main shaft.

The front end of the main shaft 4 is provided with a shaft sleeve 21 and a movable ring 22, the shaft sleeve 21 is positioned among the front bearing 11, the adjusting shaft sleeve 23 and the movable ring 22, and the front lock nut 13 is connected with the front end of the main shaft 4 in a threaded mode and used for fixing the movable ring gasket 24, the movable ring 22, the adjusting shaft sleeve 23 and the shaft sleeve 21 on the main shaft 4. A moving ring washer 24 is provided between the front lock nut 13 and the moving ring 22.

The static ring assembly 20 passes through the shaft sleeve 21 and the main shaft 4 and is fastened on the shell 1, and a static ring gasket 25 is arranged between the static ring assembly 20 and the shell 1, so that the compression amount of the static ring assembly 20 is adjusted, and the sealing effect is realized. A sealed cavity is formed between the static ring assembly 20 and the front end cover 14; three through holes are processed on the front end cover 14 communicated with the sealed cavity, one through hole is used as a medium inlet and is provided with a flowmeter for measuring inlet flow, and the other two through holes are respectively used for measuring the pressure and the temperature of the sealed cavity.

The front cover 14 is fastened to the housing 1, and a gasket 15 is provided between the front cover 14 and the housing 1.

A leakage cavity is formed between the front shaft seal gland 2 and the static ring component 20, and three through holes are processed at the position on the shell 1 communicated with the leakage cavity and are respectively used for measuring the pressure of the leakage cavity, the gas leakage port and the liquid leakage port. Spacer ring 19

The front bearing gland 10 is fastened to the housing 1 and has a dual function

The rear bearing 12 is fastened to the housing 1 by means of the rear bearing gland 5; adjusting gaskets 17 with different thicknesses are arranged between the rear bearing 12 and the rear bearing gland 5 and used for applying axial assembling pretightening force of the front bearing 11 and the rear bearing 12 and eliminating axial play of the bearings.

A rear lock nut 7 is mounted at the rear end of the main shaft 4, and the rear lock nut 7 is positioned between the rear bearing 12 and the rear end cover 6 and used for fastening the inner ring of the rear bearing 12 on the main shaft 4. The rear lock nut 7 is connected with the main shaft 4 in a threaded mode.

The rear end cover 6 is fastened to the housing 1, and a gasket 16 is provided between the rear end cover 6 and the housing 1. A bearing cavity is formed between the front oil seal gland 2 and the rear end cover 6, a cooling liquid inlet communicated with the bearing cavity is processed at the position, close to the front bearing 11, of the front end of the shell 1, and a cooling liquid outlet communicated with the bearing cavity is processed at the position, close to the uppermost part of the rear bearing 12, of the rear end of the shell 1; the main shaft 4 penetrates out of the rear end cover 6 and is connected with an output shaft of an external power driving device.

In order to realize the sealing between the rear end cover 6 and the main shaft 4 and ensure the sealing of the cooling liquid at the rear end of the main shaft, an annular groove is processed on the rear end cover 6, a rear shaft seal 9 is installed in the annular groove, and a rear cover 8 is fixed on the rear end cover 6 through a rear shaft seal.

The test process of the invention is as follows: and mounting the test device on a test bed bracket, fastening the test device, and mounting a coupling between the speed increasing box and a main shaft of the test device. And opening the medium inlet valve and the medium outlet valve, filling helium gas into the test device, and cooling the process bearing of the test device. Adjusting the pressure of a sealing cavity to be working pressure through a gas distribution table, starting a water-cooling machine of a speed increasing box, then starting a motor, starting to measure the medium inlet flow, the pressure of the sealing cavity, the temperature of the sealing cavity, the pressure of a leakage cavity, the temperature of the leakage cavity, the leakage amount, the working rotating speed, the power of a test system and the like, judging whether the sealing performance of a helium end face sealing assembly product is qualified or not by judging a leakage amount curve, and after the test time is up, closing the motor, closing the water-cooling machine, closing a medium inlet switch and finishing the test. And decomposing the test device, measuring and recording the abrasion loss of the static ring assembly and the abrasion condition of the dynamic ring, and obtaining all measurement parameter curves. The sealing performance and structural rationality of the seal assembly product are analyzed in terms of pressure, temperature and flow, providing important evidence for improving various problems that arise in the design of end face seal assembly products.

The invention can satisfactorily complete the sampling test, running-in test and research test of multiple batches of helium end face sealing pieces, and has good use effect. The technical parameters of the test device are as follows: working rotating speed: 20000 r/min; test chamber pressure: 1.0MPa (gauge pressure); working medium: helium gas; working temperature: 20-150 ℃; leakage amount measurement range: 10L/min-10 g/s. The test device measures parameters including: working speed, seal cavity medium pressure, seal cavity temperature, seal cavity flow, leakage cavity leakage, leakage cavity pressure, leakage cavity temperature, test system power and static ring assembly abrasion loss. Multiple tests show that the test device has high processing precision, reasonable structure and strong device stability in a high-speed state.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.