CN113049238B

CN113049238B - Superspeed centrifugal ventilator performance test device

Info

Publication number: CN113049238B
Application number: CN202110277504.8A
Authority: CN
Inventors: 路彬; 苏壮; 毛宏图; 李国权; 马春武
Original assignee: AECC Shenyang Engine Research Institute
Current assignee: AECC Shenyang Engine Research Institute
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2022-06-07
Anticipated expiration: 2041-03-15
Also published as: CN113049238A

Abstract

The application provides a hypervelocity centrifugal ventilator performance test device, it includes: driving motor, shaft coupling subassembly and including runner assembly, casing subassembly, seal assembly and support bearing's main cavity body subassembly, be formed with first lubricated chamber, oil gas chamber, second lubricated chamber in the main cavity body subassembly. This application is through the overall arrangement form that adopts three cavity structures, and each cavity passes through mechanical seal subassembly to be kept apart, and the both ends are arranged in solitary lubricated intracavity respectively through support bearing, and in the middle oil gas intracavity was arranged in to the centrifugal ventilator of being surveyed, the oil supply passageway and the nozzle in the rethread bearing frame lubricate support bearing and sealed or cool off the fuel feeding, and the lubricating oil that avoids lubricated chamber through the sealing between the cavity produces the influence to oil gas cavity oil gas environment.

Description

Superspeed centrifugal ventilator performance test device

Technical Field

This application belongs to centrifugal ventilator technical field, in particular to hypervelocity centrifugal ventilator performance test device.

Background

The centrifugal ventilator is an important part in an aircraft engine lubricating oil ventilation subsystem, is usually arranged in an accessory casing cavity or a bearing cavity and is positioned between the cavity and the external environment, and the main function of the centrifugal ventilator is to separate an oil-gas two-phase mixture in a ventilation flow path into lubricating oil and air so as to reduce lubricating oil consumption. The separation efficiency and the resistance of the centrifugal ventilator are important characteristics of the centrifugal ventilator, and the recovery capacity of the lubricating oil in the lubricating oil ventilation subsystem is influenced by the separation efficiency, so that the consumption of the lubricating oil is influenced, and the endurance capacity of the airplane is further influenced; the resistance will affect the pressure of the sealing cavity, the bearing cavity, the lubricating oil tank and the like at the upstream of the ventilation flow path, and further affect the oil supply/return matching characteristics of the lubricating oil system and the like. Therefore, a performance test of the centrifugal ventilator needs to be carried out in the design process of the centrifugal ventilator to check whether the separation efficiency and the resistance characteristic of the centrifugal ventilator meet the design requirements.

The rotating speed test capability of the centrifugal ventilator test device in the prior art is less than 10000r/min, and the test of the rotating speed of the centrifugal ventilator in a conventional form (the rotating speed of the centrifugal ventilator in the conventional form is usually 6000 r/min-9000 r/min) can be met.

The prior art centrifugal ventilator test apparatus 100 as shown in fig. 1 mainly comprises a driving motor 101, a coupling 102, a housing 104, a main shaft 106, a centrifugal ventilator 107 and a platform 108, wherein the housing 104, the main shaft 106, the centrifugal ventilator 107 and the like form a test chamber assembly, the main shaft 106 and the centrifugal ventilator 107 are in the same ventilator chamber 105, and a bearing 103 is lubricated and cooled by an oil-air mixture in the ventilator chamber 105. The centrifugal ventilator 107 is mounted on the main shaft 106, the main shaft 106 is connected with the driving motor 101 through the coupling 102, the centrifugal ventilator 107 performs rotary motion under the driving action of the driving motor 101, so that oil-gas separation is performed on oil-gas mixtures entering the ventilator cavity 105, separated lubricating oil is discharged through an oil return opening at the lowest part of the ventilator cavity 105 and collected, and separated oil-gas is discharged to the outside atmosphere through a hollow shaft channel of the main shaft 106.

The existing centrifugal ventilator test device can only aim at the rotating speed below 10000r/min, the supporting bearing 103 and the sealing device can only bear the rotating speed below 10000r/min, and the bearing 103 can meet the lubricating requirement by depending on oil gas in the ventilator cavity 105. However, with the continuous increase of the rotating speed of the centrifugal ventilator of the high thrust-weight ratio engine (which is close to 30000r/min), the existing centrifugal ventilator test device cannot meet the requirement of the ultrahigh rotating speed working condition test of the centrifugal ventilator.

In addition, the testing device in the prior art only depends on the encoder of driving motor to extract data and then convert to obtain in the rotational speed measurement, and the mode that the encoder extracted data can not directly reflect real rotational speed, and this data can not trace to the source, can not directly make the maneuver feedback according to real test result if taking place emergency, consequently has the safety risk.

Disclosure of Invention

It is an object of the present application to provide an ultra high speed centrifugal ventilator performance testing apparatus to solve or mitigate at least one of the problems of the background art.

The technical scheme of the application is as follows: an ultra-high speed centrifugal ventilator performance test apparatus, the test apparatus comprising:

a drive motor;

the coupling assembly is used for transmitting the rotating speed of the driving motor, one end of the coupling assembly is connected with the driving motor through a flexible connecting rope, and the other end of the coupling assembly is connected to the main cavity body assembly; and

the main cavity body assembly comprises a rotating assembly, a shell assembly, a sealing assembly and a supporting bearing;

the rotating assembly comprises a tested centrifugal ventilator for performance test and a main shaft assembly for installing the tested centrifugal ventilator;

the shell assembly comprises an oil-gas cavity assembly which is formed by a first partition disc, a middle shell and a second partition disc and used for wrapping the tested centrifugal ventilator, an oil-gas cavity is formed in the oil-gas cavity assembly, and a first bearing seat and a second bearing seat are respectively arranged on two sides of the oil-gas cavity assembly;

the supporting bearing comprises a first supporting bearing and a second supporting bearing, the first bearing is arranged between the main shaft assembly and the first bearing seat and used for supporting the first bearing seat so as to form a first lubricating cavity between the first bearing seat and the main shaft assembly, and the second bearing seat is arranged between the main shaft assembly and the second bearing seat and used for supporting the second bearing seat so as to form a second lubricating cavity between the second bearing seat and the main shaft assembly;

the sealing assembly is arranged among the first partition plate, the second partition plate, the first bearing seat, the second bearing seat and the main shaft assembly, so that the first lubricating cavity, the oil gas cavity and the second lubricating cavity form a closed space.

The first bearing seat and the second bearing seat are respectively provided with an oil way communicated with the first lubricating cavity and the second lubricating cavity, and the first supporting bearing and the second supporting bearing are lubricated by introducing lubricating oil into the oil way.

Further, the shaft coupling subassembly includes the shaft coupling and tests the speed the tooth, shaft coupling one end is connected with driving motor through the flexonics rope, the shaft coupling other end passes through tang and main shaft assembly location to through splined connection.

Furthermore, the tooth form of the speed measuring tooth is of a rectangular structure, so that a boss and a groove are formed on the edge of the speed measuring tooth, a rotating speed sensor is arranged on the first bearing seat, the rotating speed sensor senses the boss and the groove on the speed measuring tooth to generate binary signals, and the binary signals are converted to obtain rotating speed measuring results.

Further, the flexible connecting rope comprises a nylon rope.

Furthermore, the main shaft assembly comprises a main shaft and distance sleeves which are sleeved on the main shaft and distributed on two sides of the centrifugal ventilator to be tested, and the position of the shell assembly, the supporting bearing or the sealing assembly is positioned through the distance sleeves.

Further, first interval dish and second interval dish are discoid, middle casing is cylindricly, and first interval dish and second interval dish set up at the both ends of middle casing, connect through the connecting piece and form tubbiness overall structure.

Further, the seal assembly comprises a seal housing, a seal ring and a seal track, wherein the seal housing and the housing assembly are relatively fixed, the seal track and the rotating assembly are relatively fixed, the seal ring is arranged in a seal groove formed in the seal housing, and a seal structure is formed by contacting the seal ring with the end face of the seal track.

Further, the sealing ring is a graphite sealing ring.

Further, the support bearing comprises a ball bearing and a roller bearing, the ball bearing is arranged on one side close to the driving motor, and the roller bearing is arranged on one side far away from the driving motor.

Further, the testing device further comprises a base, and the main cavity assembly is arranged on the testing platform through the base.

The superspeed centrifugal ventilator test device provided by the application can realize effective isolation of lubricating/cooling oil supply and oil-gas two-phase fluid participating in the test by adopting a three-cavity separation design, and meets the lubricating/cooling oil supply conditions of bearings, sealing and the like at ultrahigh rotating speed and normal operation at ultrahigh rotating speed.

Drawings

In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.

FIG. 1 is a schematic view of a prior art centrifugal ventilator test apparatus.

FIG. 2 is a schematic view of a centrifugal ventilator test apparatus of the present application.

Fig. 3 is a schematic diagram of the positions of the speed measuring teeth and the rotation speed sensor in the present application.

Fig. 4 is an enlarged view of a structure between the first bearing seat and the spindle according to an embodiment of the present application.

Reference numerals:

1-base

2-first oil return port

3-ball bearing lock nut

4-first support bearing

5-main shaft

6-drive motor

7-nylon rope

8-shaft coupling

9-speed measuring tooth, 91-boss, 92-groove

10-speed sensor

11-first spindle lock nut

12-first distance sleeve

13-first mechanical seal assembly-14-sensor holder

15-first oil supply port

16-first bearing seat

17-second distance sleeve

18-second mechanical seal assembly

19-first spacer disk

20-middle shell

21-oil gas inlet

22-centrifugal ventilator to be tested

23-second spacer disk

24-third mechanical seal assembly

25-second bearing seat

26-third distance sleeve

27-second oil supply port

28-second support bearing

29-fourth distance sleeve

30-fourth mechanical seal assembly

31-exhaust end cap

32-second spindle lock nut

33-roller bearing lock nut

34-second oil return port

35-oil drain port

201-first lubrication Chamber

202-oil gas cavity

203-second lubricant receiving cavity

301-sealing runway

302-sealing ring

303-sealing shell

304-first seal oil supply nozzle

305-first support bearing oil supply nozzle

306-second seal oil supply nozzle

307-outer cavity

308-oil return passage

309-inner chamber

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

In order to overcome the requirement that prior art's centrifugal ventilator test device can't satisfy the super high rotational speed state, provide one kind in this application and can satisfy hypervelocity centrifugal ventilator test device.

As shown in FIG. 2, the ultra-high speed centrifugal ventilator test apparatus 200 of the present invention mainly comprises: drive motor 6, shaft coupling subassembly and main cavity body subassembly. The coupling assembly is used for connecting the driving motor 6 and the main cavity body assembly, one end of the coupling assembly is connected with the driving motor 6 through the flexible connecting rope 7, and the other end of the coupling assembly is connected with the main cavity body assembly. The main cavity assembly includes a rotating assembly, a housing assembly, a seal assembly, and a support bearing. Wherein the rotating assembly comprises a centrifugal ventilator 22 and a spindle assembly for mounting and supporting the centrifugal ventilator 22. The housing assembly mainly comprises an oil-gas cavity assembly which is formed by a first partition plate 19, a middle housing 20 and a second partition plate 23 and is provided with an oil-gas cavity 202, the oil-gas cavity assembly basically wraps and accommodates a centrifugal ventilator 22, and a first bearing seat 16 and a second bearing seat 25 are respectively arranged on the left side and the right side of the oil-gas cavity assembly. The housing assembly and the rotating assembly are connected through a supporting bearing, wherein the supporting bearing comprises a first supporting bearing 4 and a second supporting bearing 28, the first supporting bearing 4 is arranged between the main shaft assembly and the first bearing seat 16, and can play a role in supporting the first bearing seat 16, so that a first lubricating cavity 201 is formed between the first bearing seat 16 and the main shaft assembly, the second supporting bearing 28 is arranged between the main shaft assembly and the second bearing seat 25, and can play a role in supporting the second bearing seat 25, so that a second lubricating cavity 203 is formed between the second bearing seat 25 and the main shaft assembly. Wherein, be equipped with the oil circuit of intercommunication first lubrication chamber 201 and second lubrication chamber 203 on first bearing frame 16 and the second bearing frame 25 respectively, through leading to lubricating oil to the oil circuit internal, realize the lubrication to first support bearing 4 and second support bearing 28. Finally, a sealing assembly is arranged between the first partition plate 19, the second partition plate 23, the first bearing seat 16, the second bearing seat 25 and the main shaft assembly, so that the first lubricating cavity 201, the oil-gas cavity 202 and the second lubricating cavity 203 form a closed cavity.

The test device of this application can realize the effective isolation of lubricated or cooling fuel feeding and the oil gas two-phase fluid of participation experiment through adopting three chamber partition designs to guarantee the stability of the lubricated or cooling demand and the two-phase environment of centrifugal ventilator oil gas intracavity oil gas of support bearing and seal assembly, improve the rotational speed operating mode that is suitable for.

In the preferred embodiment of the above scheme, the coupling assembly further comprises a coupling 8 and a speed measuring tooth 9, one end of the coupling 8 is connected with the driving motor 6, and the other end of the coupling 8 is connected with the main shaft 5 of the test cavity assembly.

On the side that shaft coupling 8 and driving motor 6 are connected, the cooperation of both can adopt the same size ring flange to realize connecting, at a plurality of connecting holes of ring flange circumference equipartition, pass flexible connection rope 7 in the connecting hole and realize the transmission of rotational speed. In some embodiments of this application, the flexible connection rope 7 can nylon rope or other soft ropes that can bear great strength, connects through flexible connection rope 7, can reduce the impact when starting or stopping to tolerate higher rotational speed.

And on the side that shaft coupling 8 is connected with main shaft assembly, shaft coupling 8 and main shaft assembly adopt spline 37 to realize the transmission of rotational speed to realize high bearing capacity and self-centering. In addition, the coupler 8 and a main shaft 5 in the main shaft assembly are positioned by a spigot 36, the spigot cylindrical surfaces are in small clearance fit, the coupler assembly gradually approaches the main shaft 5 from the axial direction during assembly, when the spigot 36 is installed in place, a spline 37 outside the coupler and a spline in the main shaft 5 are installed in place simultaneously, and the collision and abrasion caused by direct assembly of an inner spline and an outer spline can be reduced by the design of the spigot 36.

In the further technical scheme of this application, the outside of shaft coupling 8 is installed and is tested the speed tooth 9, tests the radial outside of speed tooth 9 and arranges tacho sensor 10, and tacho sensor 10 passes through sensor support 14 to be installed on first bearing frame 16. The structure of the speed measuring tooth 9 is shown in fig. 4, the tooth shape of the speed measuring tooth 9 is rectangular or approximately rectangular, so that a boss 91 and a groove 92 can be formed at the edge of the speed measuring tooth 9, the boss 91 and the groove 92 are alternately and uniformly distributed and respectively correspond to a large diameter R and a small diameter R, and the radial distance L between the rotating speed sensor 10 and the large diameter R of the speed measuring tooth 9 is kept between 0.5mm and 1.5 mm. When the revolution speed sensor 10 corresponds to the large diameter R of the tachometer teeth 9, the signal of the revolution speed sensor is 1, and when the revolution speed sensor corresponds to the small diameter R of the tachometer teeth 9, the signal is 0. In the rotation process of the speed measuring teeth 9 along with the main shaft assembly, the rotation speed measuring result of the measured centrifugal ventilator can be obtained through the change frequency of the signals sensed by the rotation speed sensor 10 and conversion.

In the preferred embodiment of the above scheme, the spindle assembly comprises a spindle 5 and distance sleeves distributed on two sides of the spindle 5, and the positions of a spacing disc, a bearing seat and the like in the housing assembly can be positioned through the distance sleeves. For example, as shown in fig. 2, the distance sleeves comprise a first distance sleeve 12 and a second distance sleeve 17 on the left side of the centrifugal fan 22 and a third distance sleeve 26 and a fourth distance sleeve 29 on the right side of the centrifugal fan 22, the first distance sleeve 12 and the second distance sleeve 17 can be fixed on the left side of the spindle 5 by engaging the first spindle lock nut 11 with the spindle 5, and the third distance sleeve 26 and the fourth distance sleeve 29 can be fixed on the right side of the spindle 5 by engaging the second spindle lock nut 32 with the spindle 5.

In the preferred embodiment of the above solution, the support bearing may be a ball bearing as the first support bearing 4 and a roller bearing as the second support bearing 28, referring to the conventional tester structure. The first support bearing 4 is mounted on a first bearing block 16 and is secured by a ball bearing lock nut 3. The roller bearing 28 has separable inner and outer races, the outer race being mounted on the second bearing housing 25 and secured by a roller bearing lock nut 33. The mounting structure along the axial direction on the main shaft 5 comprises a centrifugal ventilator 22, a second distance sleeve 17, a first support bearing 4 and a first distance sleeve 12 in sequence, and is finally fastened through a first main shaft locking nut 11; in the opposite direction, in turn, the third distance sleeve 26, the roller bearing 28, the fourth distance sleeve 29 and finally the tightening by means of the second spindle lock nut 32. And the exhaust end cover 31 is arranged on the second bearing seat 25, and the exhaust port is connected with an exhaust pipeline of the test system and used for conveying the separated residual oil gas.

In the preferred embodiment of the above solution, the first bearing seat 16, the first spacing disk 19, the intermediate housing 20, the second spacing disk 23, and the second bearing seat 25 in the housing assembly are arranged in sequence in the axial direction, and adjacent parts are fixed and positioned by means of rabbets and fastened by means of bolt connection. In a further embodiment, the first spacer 19 and the second spacer 23 are disc-shaped, the intermediate housing 20 is cylindrical, and the spacers are disposed on both sides of the intermediate housing 20 and fixed together by bolts.

In the preferred embodiment of the above solution, there are 4 sets of seal assemblies between the housing assembly and the rotating assembly, as shown in fig. 2, the seal assemblies are a first seal assembly 13, a second seal assembly 18, a third seal assembly 24 and a fourth seal assembly 30, which are mounted on the first bearing seat 16, the first spacer disc 19, the second spacer disc 23 and the second bearing seat 25, respectively. The space in the housing assembly is divided into 3 closed cavities, namely an oil gas cavity 202, a first lubricating cavity 201 and a second lubricating cavity 203, by 4 sets of sealing assemblies. The oil-gas chamber 202 is located in the middle and is an oil-gas two-phase environment chamber where the centrifugal ventilator 22 is tested, the first lubrication chamber 201 is a lubrication environment chamber where the first support bearing 4 is located, and the second lubrication chamber 203 is a lubrication environment chamber where the second support bearing 28 is located.

By separating the oil gas chamber 202 from the bearing lubrication chamber, the supplied lubricating oil for lubricating or cooling the bearing can be prevented from being mixed with the oil gas environment of the oil gas chamber 202, thereby affecting the test effects such as the separation efficiency of the centrifugal ventilator.

As shown in fig. 4, the bearing lubrication chamber is described by taking as an example a first lubrication chamber 201 of the first support bearing 4. The first lubrication chamber 201 is enclosed by the first bearing seat 16, the first spacing disc 19, the main shaft 5, the first distance sleeve 12, the second distance sleeve 17, the first sealing assembly 13 and the second sealing assembly 18, the first support bearing 4 is located at a middle position, the first lubrication chamber 201 is divided into an outer chamber 307 and an inner chamber 309, and the outer chamber 307 and the inner chamber 309 are communicated with an oil return passage 308 arranged on the first bearing seat 16 through a bearing clearance of the first support bearing 4. The 4 sets of sealing assemblies are similar in structure and mainly comprise a sealing shell 303, a sealing ring 302 and a sealing runway 301, in the sealing assembly of the first lubricating oil cavity 201 in the embodiment, the sealing shell 303 wraps the outer side of the graphite sealing ring 302, the sealing shell 303 is mounted on the first bearing seat 16 through bolts, the sealing runway is mounted on the first distance sleeve 12 and rotates along with the first distance sleeve 12 and the main shaft 5, the sealing ring 302 and the sealing runway 301 are in end face contact in the axial direction, and the axial compression of the sealing ring 302 and the sealing runway 301 is realized through an axial spring in the sealing shell 303, so that the sealing effect is achieved. The sealing ring 302 is made of graphite material.

Because the sealing assembly belongs to contact type sealing and can generate heat by friction in a high-speed working state, an oil supply channel is arranged inside the first bearing seat 16, lubricating oil enters the oil supply channel inside the first bearing seat 16 from the first oil supply port 15, and a first sealing oil supply nozzle 304, a first support bearing oil supply nozzle 305 and a second sealing oil supply nozzle 306 which are formed by the internal channels respectively spray oil to the first sealing assembly 13, the first support bearing 4 and the second sealing assembly 18, so that the lubricating and cooling effects are achieved. The lubricant entering the outer chamber 307 through the first seal oil feed nozzle 304, the ball bearing oil feed nozzle 305 flows by gravity through the obliquely arranged oil return holes 308 to the inner chamber 309, and finally the lubricant flows to the external pipeline through the first oil return port 2 and is collected.

It will be appreciated that the second lubrication chamber 203 formed in the second bearing housing 25 supported by the second support bearing 28 is similar to the above-described structure and will not be described in detail herein.

Finally, still base 1 among the testing device of this application, main cavity body subassembly passes through base 1 to be installed on the platform, and is concrete, and casing unit ann is located base 1 top, and the outer cylinder wall of middle casing 20 contacts with the interior cylinder wall of base 1, fastens through bolted connection.

After the test device in the application is installed, the mixed oil-gas mixture enters the oil-gas cavity 202 from the oil-gas inlet 21, rotating components such as the centrifugal ventilator 22 rotate under the rotation driving action of the driving motor 6, the oil-gas mixture is separated by centrifugal force generated by the rotation of the centrifugal ventilator 22, most of lubricating oil is separated and gathered at the bottom of the oil-gas cavity 202 by the self gravity, the lubricating oil is discharged through the oil outlet 35 and collected to obtain a mass M1, the oil-gas containing a small amount of lubricating oil which is not separated is discharged to the collecting device through the axial channel of the main shaft 5, the mass M2 is collected, and the separation efficiency is M1/(M1+ M2). The resistance Δ P can be calculated by monitoring the pressure P1 of the oil air chamber 202 and the pressure P2 on the exhaust line during the test, which is P1-P2.

The application discloses hypervelocity centrifugation ventilator test device mainly has following advantage:

1) by adopting the layout form of three cavity structures, each cavity is isolated by a mechanical seal assembly, two ends of each cavity are respectively arranged in an independent lubricating cavity through a supporting bearing, a tested centrifugal ventilator is arranged in a middle oil gas cavity, the supporting bearing and the seal are lubricated or cooled and supplied with oil through an oil supply channel and a nozzle in a bearing seat, and the lubricating oil in the lubricating cavity is prevented from influencing the oil gas environment in the oil gas cavity through the seal between the cavities;

2) in the coupling assembly, one end of the coupling is connected with an internal spline of the test main shaft through an external spline, so that the characteristics of high bearing capacity, automatic centering and the like are realized, meanwhile, the coupling and the main shaft are positioned through a spigot, the collision and abrasion caused by direct assembly of the internal spline and the external spline are reduced, the other end of the coupling is connected with the end of the driving motor through a flexible connecting rope through a flange plate, and the bearing of ultrahigh rotating speed is realized.

3) The coupler is provided with the speed measuring teeth, so that the direct measurement of the rotating speed is realized, and the problems that the source cannot be traced in the test caused by the conversion of the rotating speed by extracting data from the motor encoder are solved.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An ultra-high speed centrifugal ventilator performance test apparatus, characterized in that the test apparatus (200) comprises:

a drive motor (6);

the coupling assembly is used for transmitting the rotating speed of the driving motor (6), one end of the coupling assembly is connected with the driving motor (6) through a flexible connecting rope (7), and the other end of the coupling assembly is connected with the main cavity assembly; and

wherein the rotating assembly comprises a tested centrifugal ventilator (22) for performance test and a main shaft assembly for installing the tested centrifugal ventilator (22);

the shell assembly comprises an oil-gas cavity assembly which is composed of a first partition plate (19), a middle shell (20) and a second partition plate (23) and wraps a tested centrifugal ventilator (22), an oil-gas cavity (202) is formed in the oil-gas cavity assembly, and a first bearing seat (16) and a second bearing seat (25) are respectively installed on two sides of the oil-gas cavity assembly;

the supporting bearing comprises a first supporting bearing (4) and a second supporting bearing (28), the first supporting bearing (4) is arranged between the main shaft assembly and the first bearing seat (16) and used for supporting the first bearing seat (16) so as to form a first lubricating cavity (201) between the first bearing seat (16) and the main shaft assembly, and the second supporting bearing (28) is arranged between the main shaft assembly and the second bearing seat (25) and used for supporting the second bearing seat (25) so as to form a second lubricating cavity (203) between the second bearing seat (25) and the main shaft assembly; the first bearing seat (16) and the second bearing seat (25) are respectively provided with an oil way communicated with a first lubricating cavity (201) and a second lubricating cavity (203), and lubricating oil is introduced into the oil ways to lubricate a first supporting bearing (4) and a second supporting bearing (28);

the sealing assembly is arranged among the first spacing disc (19), the second spacing disc (23), the first bearing seat (16), the second bearing seat (25) and the main shaft assembly, so that the first lubricating cavity (201), the oil-gas cavity (202) and the second lubricating cavity (203) form a closed space.

2. The ultra-high speed centrifugal ventilator performance test device according to claim 1, wherein the coupling assembly comprises a coupling (8) and a speed measuring tooth (9), one end of the coupling (8) is connected with the driving motor (6) through a flexible connecting rope (7), and the other end of the coupling (8) is positioned with the spindle assembly through a spigot (36) and connected with the spindle assembly through a spline (37).

3. The ultra-high speed centrifugal ventilator performance test device according to claim 2, characterized in that the tooth shape of the speed measuring tooth (9) is a rectangular structure, so that a boss (91) and a groove (92) are formed on the edge of the speed measuring tooth (9), and a rotation speed sensor (10) is arranged on the first bearing seat (16), the rotation speed sensor (10) senses the boss (91) and the groove (92) on the speed measuring tooth to generate a binary signal, and the rotation speed measurement result can be obtained by converting the binary signal.

4. An ultra high speed centrifugal ventilator performance test apparatus as claimed in claim 1 or 2, characterised in that the flexible connection cord (7) comprises a nylon cord.

5. The ultra-high speed centrifugal ventilator performance test device according to claim 1, characterized in that the spindle assembly comprises a spindle (5) and distance sleeves which are sleeved on the spindle (5) and distributed at two sides of the centrifugal ventilator (22) to be tested, and the position of the shell assembly, the support bearing or the sealing assembly is positioned through the distance sleeves.

6. The apparatus for testing performance of an ultracentrifuge ventilator according to claim 1, wherein the first and second spacers (19, 23) are disk-shaped, the middle casing (20) is cylindrical, and the first and second spacers (19, 23) are disposed at both ends of the middle casing (20) and are connected by a connecting member to form a barrel-shaped integral structure.

7. The ultra-high speed centrifugal ventilator performance testing apparatus of claim 1 wherein the seal assembly comprises a seal housing, a seal ring and a seal track, wherein the seal housing is fixed relative to the housing assembly, the seal track is fixed relative to the rotatable assembly, the seal ring is disposed within a seal groove formed in the seal housing, and a seal structure is formed by contacting the seal ring with an end surface of the seal track.

8. The ultra high speed centrifugal ventilator performance test apparatus of claim 7 wherein said seal ring is a graphite seal ring.

9. The apparatus for testing performance of an ultracentrifuge ventilator according to claim 1, wherein the first support bearing (4) is a ball bearing and the second support bearing (28) is a roller bearing, the ball bearing being disposed on a side close to the drive motor (6) and the roller bearing being disposed on a side remote from the drive motor (6).

10. The ultra-high speed centrifugal ventilator performance test apparatus of claim 1 wherein the test apparatus further comprises a base (1), the main chamber assembly being mounted to a test platform via the base (1).