Engine altitude chamber power test unit

Abstract

The application discloses an engine altitude cabin power testing device, which comprises an altitude cabin, a dynamometer and a power output device, an engine is fixed to a mounting seat in the cabin, power of the engine is transmitted to the dynamometer outside the cabin through a transmission shaft and the power output device, the dynamometer is prevented from being affected by the environment in the cabin, the power output device adopts a sealing structure with a static pressure cavity, a high vacuum is maintained in the cavity through a vacuum pump, main shaft dynamic sealing is realized by using an airflow barrier, there is no friction and wear, the service life is long, and the precision is high, the device is integrated with a linear and lifting motion module, engine installation and butt joint with the power output device are facilitated, and automatic alignment and engagement of a spline coupling of the transmission shaft are realized through butt joint driving mechanisms, and butt joint efficiency and sealing performance are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine test device, in particular to an engine altitude cabin power test device. BACKGROUND

[0002] The engine altitude cabin test is to simulate the plateau environment at an altitude of 3000-6000 meters to test various performance indicators of the engine in the plateau environment. Because of the air tightness requirement of the cabin body, the existing engine altitude cabin test structure directly installs the dynamometer for loading and the tested engine in the altitude cabin, so that the dynamometer also works in the high-altitude environment, and the service life is far less than the designed service life, the failure rate is high, and the maintenance cost is high in the later period. Although the dynamometer can be installed outside the altitude cabin to ensure the service life of the dynamometer, how to ensure the sealing of the power connection between the dynamometer and the engine is a difficulty in the prior art. SUMMARY

[0003] In view of the above deficiencies in the prior art, the present application aims to provide a test device with low overall failure rate and reduced manual operation to speed up the test efficiency.

[0004] The technical scheme adopted by the present application to achieve the above-mentioned purpose is: an engine altitude cabin power test device, comprising an altitude cabin, a dynamometer, and a power output device, wherein the bottom surface of the altitude cabin is provided with a mounting platform, the mounting platform is fixedly connected with a mounting seat, the mounting seat is fixedly connected with an engine, the outside of the altitude cabin is fixedly connected with the dynamometer, the cabin wall of the altitude cabin is fixedly connected with the power output device, the power output end of the engine is connected with the power output device through a transmission shaft, and the power output device is connected with the dynamometer through a connecting shaft.

[0005] The power output device comprises a bearing seat and a transmission main shaft rotatably connected to the bearing seat, a static pressure cavity is arranged between the transmission main shaft and the bearing seat, sealing rings are arranged on both sides of the static pressure cavity between the transmission main shaft and the bearing seat, bearings are fixedly connected to both ends of the bearing seat, the transmission main shaft is matched with the bearings, a balance cavity is arranged between the bearings and the sealing rings, balance air channels are arranged on the bearing seat and communicate with the balance cavity, one group of balance air channels communicate with the inside of the altitude cabin, and the other group of balance air channels communicate with the outside of the altitude cabin, the static pressure cavity is connected with a balance pipe, a vacuum pump is connected to the balance pipe, one end of the transmission main shaft is connected with the transmission shaft, and the other end of the transmission main shaft is connected with the connecting shaft.

[0006] In the above technical scheme, the specific structure of the power output device is as follows:

[0007] The power output device further comprises a mounting shell, a sealing connecting sleeve, a power output coupling, and a power input coupling, the sealing connecting sleeve is fixedly connected to the mounting shell, the mounting shell is fixedly connected to the bulkhead, the bearing seat is fixedly connected to the sealing connecting sleeve, the bearing seat is fixedly connected in the altitude cabin, the balance pipe is fixedly connected to the sealing connecting sleeve, the vacuum air duct is arranged in the bearing seat and communicates with the static pressure cavity, the balance pipe communicates with the vacuum air duct, the power input coupling is fixedly connected to one end of the transmission main shaft, the power input coupling is power-connected with the transmission shaft, the power output coupling is fixedly connected to the other end of the transmission main shaft, and the power output coupling is power-connected with the connecting shaft.

[0008] In an embodiment, a linear motion module is arranged in the mounting platform, the linear motion module comprises a horizontal motion table, a lifting motion module is arranged on the horizontal motion table, the lifting motion module comprises a lifting motion table, and the mounting seat is fixedly connected to the lifting motion table.

[0009] One end of the transmission shaft is fixedly connected to the power output end of the engine, the other end is provided with a spline part, the power input coupling is matched with the spline part by using a spline sleeve shaft, the linear motion module and the lifting motion module can drive the engine to move, so that the spline part is inserted into the power input coupling.

[0010] In the above embodiment, in order to reduce the driving source and reduce the failure rate, the lifting motion module comprises a power input mechanism, a power generating part is arranged on the mounting platform and matched with the power input mechanism, when the linear motion module drives the power input mechanism to move linearly, the power input mechanism is matched with the power generating part, so that the lifting motion table can realize lifting motion.

[0011] In the above embodiment, the linear motion module adopts the following structure:

[0012] The linear motion module further comprises a guide rail, a speed reducer, a first lead screw, and a first driving motor, the mounting platform is fixedly connected with the guide rail, the horizontal motion table is slidingly connected to the guide rail, the first lead screw is threadedly connected to the horizontal motion table, the mounting platform is fixedly connected with the speed reducer, the power output end of the speed reducer is power-connected with the first lead screw, the first driving motor is fixedly connected to the outside of the mounting platform, and the first driving motor is power-connected with the power input end of the speed reducer.

[0013] Further, the lifting motion module adopts the following structure:

[0014] The lifting movement module further comprises a guide column and a second lead screw, the guide column is fixedly connected to the horizontal movement table, the lifting movement table is slidably connected to the guide column, the second lead screw is threadedly connected to the lifting movement table, the power input mechanism is arranged on the horizontal movement table and is in power connection with the second lead screw.

[0015] In the above embodiment, the power input mechanism adopts the following structure:

[0016] The power input mechanism comprises a worm, a worm wheel, and a gear, the bottom end of the second lead screw is fixedly connected with the worm wheel, the horizontal movement table is rotatably connected with the worm, the worm is in meshing connection with the worm wheel, the worm is fixedly connected with the gear, and the power generating piece is in matching connection with the gear through a rack.

[0017] In another embodiment, the engine and the power output device are in butt joint with the following optimization:

[0018] The butt joint driving mechanism is arranged on the outer wall of the altitude cabin and is in power connection with the transmission shaft.

[0019] In the above embodiment, the butt joint driving mechanism adopts the following structure:

[0020] The butt joint driving mechanism comprises a mounting rack, a first gear, a second gear, a second driving motor, and an output shaft, the mounting rack is fixedly connected to the cabin wall, the second driving motor is fixedly connected to the mounting rack, the output shaft is in power connection with the second driving motor, the first gear is fixedly connected to the output shaft, the second gear is fixedly connected to the connecting shaft, and the first gear is in meshing connection with the second gear.

[0021] In another embodiment, to avoid the influence of the butt joint driving mechanism on the test effect, the output shaft adopts the following structure:

[0022] The output shaft comprises a main sleeve shaft, an extension shaft, and a first spring, the main sleeve shaft is rotatably connected to the mounting rack and is in power connection with the second driving motor, the main sleeve shaft is provided with a movement cavity, the movement cavity is provided with a spline groove, the extension shaft is fixedly connected with a spline bar, the spline bar is slidably connected in the spline groove, the first spring is fixedly connected in the movement cavity and is fixedly connected with the extension shaft, and the first gear is fixedly connected to the extension shaft.

[0023] Further, a pushing piece is arranged on the cabin wall and matched with the first gear, a pushing frame is arranged on the mounting seat and matched with the pushing piece, when the mounting seat moves linearly, the pushing frame can push the pushing piece linearly, the pushing piece can push the first gear to move linearly, so that the first gear is dislocated with the second gear.

[0024] In the above embodiment, the pushing piece has the following structure:

[0025] The pushing piece comprises a moving shaft, a pushing head, a second spring and a sealing table, the moving shaft is slidably connected to the cabin wall, a sealing sleeve is arranged between the moving shaft and the cabin wall, the pushing head is fixedly connected to the outer end of the moving shaft, the pushing head abuts against the first gear, a limiting table is fixedly connected to the outer region of the moving shaft, the second spring is sleeved on the moving shaft, one end of the second spring is fixedly connected to the limiting table, and the other end is fixedly connected to the cabin wall, the sealing table is fixedly connected to the inner region of the moving shaft, and a sealing ring is arranged on the sealing table, after the pushing head pushes the first gear to be dislocated with the second gear, the sealing ring abuts against the inner wall of the cabin wall.

[0026] The beneficial effects of the present application are as follows:

[0027] 1. By placing the dynamometer outside the altitude chamber, the influence of the internal environment of the altitude chamber on the dynamometer can be reduced, the failure of the dynamometer can be reduced, and the service life of the dynamometer can be prolonged.

[0028] 2. The dynamometer and the engine are connected in power through a power output device, a static pressure cavity is arranged between the transmission main shaft of the power output device and the bearing seat, the static pressure cavity is connected with a vacuum pump through a balance pipe, the air in the static pressure cavity can be extracted through the vacuum pump, the negative pressure in the cavity can be actively maintained, the exchange of gas inside and outside the altitude chamber is effectively prevented, the sealing property of the altitude chamber is ensured, and the test accuracy is improved, at the same time, through the arrangement of the balance cavity, the influence of negative pressure on the bearing can be avoided, and the sealing property of the bearing is ensured.

[0029] 3. The engine is fixedly connected with a transmission shaft, and the transmission shaft and the power input coupling in the power output device are connected in a spline connection mode, the engine can be driven to move linearly through the linear motion module, so that the transmission shaft and the power input coupling are automatically connected and reliably transmit power, such structure can reduce the manual power connection operation, speed up the test efficiency, and the first driving motor of the linear motion module is located outside the altitude chamber, so that the service life of the first driving motor can be avoided from being affected by the environment in the altitude chamber.

[0030] 4. The horizontal motion platform is provided with a lifting motion module, and the mounting seat is fixedly connected to the lifting motion platform, the height of the mounting seat can be adjusted through the lifting motion module, so that the height is lower when the engine is installed or disassembled, and the operation is facilitated, and the installation efficiency is improved;

[0031] 5. The lifting motion module is matched with the power generating piece through the power input mechanism, the working of the lifting motion module is realized, when the linear motion module drives the engine to move towards the power output device, the lifting motion module drives the generator to ascend until reaching the predetermined position, the power of the first driving motor can be fully utilized, the number of driving sources is reduced, and the driving motor in the altitude cabin is avoided, so that the failure rate of the whole device is low;

[0032] 6. The connecting shaft is matched with the butt joint driving mechanism, when the transmission shaft is butt jointed with the power input coupling, if the spline part does not match the spline sleeve shaft, the connecting shaft can be driven to rotate through the butt joint driving mechanism, so that the two are matched, and the manual operation is reduced;

[0033] 7. The output shaft piece in the butt joint driving mechanism adopts a telescopic type, when the linear motion module drives the mounting seat to move linearly, the spline part is butt jointed with the spline sleeve shaft, the pushing frame can push the pushing piece, the first gear and the second gear are dislocated through the pushing piece, the output power of the engine will not be transmitted to the second driving motor, the interference of the butt joint driving mechanism on the engine test can be avoided, and the test precision is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structural schematic view of the present application;

[0035] Figure 2 It is a structural schematic view of the power output device in the present application;

[0036] Figure 3 It is a structural schematic view of the linear motion module and the lifting motion module provided in the present application;

[0037] Figure 4 It is a structural schematic view of the butt joint driving mechanism provided in the present application;

[0038] Figure 5 It is a structural schematic view of the linear motion module and the lifting motion module in the present application;

[0039] Figure 6 It is Figure 5 a detailed structural schematic view of the part a in the present application;

[0040] Figure 7 It is a structural schematic view when the transmission shaft and the power input coupling are not butt jointed in the present application;

[0041] Figure 8The schematic structural diagram of the transmission shaft and the power input coupling after butt joint in the application;

[0042] Figure 9 The schematic structural diagram of the transmission shaft and the power input coupling after butt joint in the application; Figure 8 The schematic structural diagram of the transmission shaft and the power input coupling after butt joint in the application;

[0043] Figure 10 The schematic structural diagram of the transmission shaft and the power input coupling after butt joint in the application; Figure 7 The schematic structural diagram of the transmission shaft and the power input coupling after butt joint in the application;

[0044] Figure 11 The schematic structural diagram of the transmission shaft and the power input coupling after butt joint in the application.

[0045] In the figure: 100 is an altitude cabin, 101 is a mounting platform, and 102 is a mounting seat;

[0046] 200 is a dynamometer;

[0047] 300 is a power output device, 301 is a mounting shell, 302 is a sealing connecting sleeve, 303 is a bearing seat, 304 is a transmission main shaft, 305 is a static pressure cavity, 306 is a sealing ring, 307 is a bearing, 308 is a balance cavity, 309 is a balance air duct, 310 is a vacuum air duct, 311 is a balance pipe, 312 is a power input coupling, and 313 is a power output coupling;

[0048] 400 is a transmission shaft, and 401 is a spline part;

[0049] 500 is a connecting shaft;

[0050] 600 is a linear motion module, 601 is a guide rail, 602 is a horizontal motion table, 603 is a speed reducer, 604 is a first lead screw, and 605 is a first driving motor;

[0051] 700 is a lifting motion module, 701 is a guide column, 702 is a lifting motion table, 703 is a second lead screw, 704 is a power input mechanism, 7041 is a worm, 7042 is a worm wheel, 7043 is a gear, and 705 is a power generation part;

[0052] 800 is a butt joint driving mechanism, 801 is a mounting rack, 802 is a first gear, 803 is a second gear, 804 is a second driving motor, 805 is an output shaft part, 8051 is a main sleeve shaft, 8052 is a telescopic shaft, 8053 is a first spring, 8054 is a motion cavity, 8055 is a spline groove, and 8056 is a spline bar;

[0053] 900 is a pushing part, 901 is a motion shaft, 902 is a pushing head, 903 is a second spring, and 904 is a sealing table;

[0054] 1000 is a pushing frame. DETAILED DESCRIPTION

[0055] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort shall fall within the protection scope of the present application. Embodiments

[0056] Please refer to Figure 1 , Figure 2 , the engine altitude cabin power test device, including altitude cabin 100, dynamometer 200, power output device 300, wherein, the bottom surface of altitude cabin 100 is provided with mounting platform 101, and the mounting platform 101 is fixedly connected with mounting seat 102, and the mounting seat 102 is fixedly connected with engine, in addition, the dynamometer 200 is fixedly connected outside the altitude cabin 100, and the power output device 300 is fixedly connected on the cabin wall of the altitude cabin 100, the power output end of the engine is power connected with the power output device 300 through transmission shaft 400, and the power output device 300 is power connected with the dynamometer 200 through connecting shaft 500, so that the power of the engine is transmitted to the dynamometer 200 through the power output device 300, so that the performance of the engine is tested through the dynamometer 200, and the dynamometer 200 is located outside the altitude cabin 100, so that the dynamometer 200 is avoided to be located in the altitude cabin 100 for a long time, the failure of the dynamometer 200 is reduced, and the service life of the dynamometer 200 is improved;

[0057] In addition, in order to ensure the sealing property of the altitude cabin 100, in the embodiment, the power output device 300 comprises mounting shell 301, sealing connecting sleeve 302, bearing seat 303 and transmission main shaft 304, namely, the sealing connecting sleeve 302 is fixedly connected on the mounting shell 301, the mounting shell 301 is fixedly connected on the cabin wall, and the sealing between the mounting shell 301 and the cabin cavity is realized through flexible sealing ring 306, the bearing seat 303 is fixedly connected in the altitude cabin 100 and fixedly connected on the sealing connecting sleeve 302, and the transmission main shaft 304 is rotatably connected in the bearing seat 303, and the static pressure cavity 305 is arranged between the transmission main shaft 304 and the bearing seat 303;

[0058] In addition, the sealing ring 306 is arranged on both sides of the static pressure cavity 305 between the transmission main shaft 304 and the bearing seat 303, the bearing 307 is fixedly connected on both ends of the bearing seat 303, the transmission main shaft 304 cooperates with the bearing 307, the balance cavity 308 is arranged between the bearing 307 and the sealing ring 306, the balance gas channel 309 is arranged on the bearing seat 303 and communicated with the balance cavity 308, one group of balance gas channels 309 are communicated with the inside of the altitude cabin 100, and the other group of balance gas channels 309 are communicated with the outside of the altitude cabin 100;

[0059] Further, the bearing seat 303 is provided with a vacuum air passage 310 in communication with the static pressure cavity 305, and the balance pipe 311 is fixedly connected to the sealing connecting sleeve 302 and in communication with the vacuum air passage 310, and the vacuum pump is connected to the balance pipe 311 in pipeline;

[0060] When the power output device 300 is used, the transmission main shaft 304 is power-connected to the transmission shaft 400 at one end and power-connected to the connecting shaft 500 at the other end. Specifically, the transmission main shaft 304 is fixedly connected with the power input coupling 312 at one end, and the power input coupling 312 is power-connected to the transmission shaft 400. The transmission main shaft 304 is fixedly connected with the power output coupling 313 at the other end, and the power output coupling 313 is power-connected to the connecting shaft 500. In this way, the engine can drive the transmission main shaft 304 to rotate through the transmission shaft 400, and then the transmission main shaft 304 transmits power to the dynamometer 200 through the connecting shaft 500.

[0061] When the vacuum pump is continuously working, the gas in the static pressure cavity 305 can be pumped out, so that it is maintained in a high vacuum state lower than the air pressure inside the altitude cabin 100. Since the pressure (Pstatic) in the static pressure cavity 305 is the lowest among the three regions (Patmosphere > Paltitude cabin 100 > Pstatic), the gas will naturally flow from the high-pressure region to the cavity with the lowest pressure. That is, the external air will try to leak to the static pressure cavity 305 through the gap of the bearing seat 303, and the gas in the altitude cabin 100 will also try to leak to the static pressure cavity 305 through the gap on the other side. The two opposite gas flows converge in the static pressure cavity 305 and are pumped away by the vacuum pump. This is equivalent to replacing the traditional physical seal between the transmission main shaft 304 and the bearing seat 303 with an invisible barrier composed of “inflowing gas”. As long as the pumping rate of the vacuum pump is greater than the leakage rate on both sides, the gas can be effectively prevented from passing through the static pressure cavity 305, thereby achieving sealing. Such a structure can improve the sealing performance of the power output device 300. Moreover, the transmission main shaft 304 has no physical contact with the static pressure cavity 305 when rotating, so there is no friction, no wear, no heat generation, and no power consumption of the engine, greatly improving the sealing life and test accuracy.

[0062] In addition, the balance cavities 308 on both sides of the bearing seat 303 are respectively in communication with the balance air passages 309. In this way, the inner balance cavity 308 is in communication with the inside of the altitude cabin 100 through the balance air passage 309, and the outer balance cavity 308 is in communication with the outside atmosphere through the balance air passage 309. Therefore, the pressures on both sides of the bearings 307 at both ends are balanced, and there is no pressure difference between the bearings 307 at both ends, thereby avoiding the lubricating medium being sucked into the altitude cabin 100 or the static pressure cavity 305, which causes the sealing of the bearings 307 to be damaged. Embodiment

[0063] Please refer toFigures 3-8 , engine altitude cabin power test device, on the basis of embodiment 1, this embodiment further says:

[0064] In this embodiment, please refer to Figure 3 , one end of the transmission shaft 400 is fixedly connected with the power output end of the engine, and the other end is provided with a spline part 401, and the power input coupling 312 is matched with the spline part 401 by using spline sleeve shaft, and the power connection is realized by the butt joint of the two;

[0065] When the above structure is used, please refer to Figure 4 、 Figure 5 , the linear motion module 600 is arranged in the installation platform 101, the linear motion module 600 includes guide rail 601, horizontal motion table 602, speed reducer 603, first lead screw 604, first drive motor 605, that is, the guide rail 601 is fixedly connected on the installation platform 101, the horizontal motion table 602 is slidably connected on the guide rail 601, the first lead screw 604 is threadedly connected on the horizontal motion table 602, the speed reducer 603 is fixedly connected on the installation platform 101, and the speed reducer 603 and the installation platform 101 are sealed, the power output end of the speed reducer 603 is power connected with the first lead screw 604, the first drive motor 605 is fixedly connected outside the installation platform 101, and the first drive motor 605 is power connected with the power input end of the speed reducer 603, so that the power of the first drive motor 605 can be transmitted to the first lead screw 604 through the speed reducer 603, then the horizontal motion table 602 can slide linearly on the guide rail 601, and the first drive motor 605 is located outside the altitude cabin 100, so that the service life of the first drive motor 605 is avoided to be affected by the environment of the altitude cabin 100, and the failure rate is reduced;

[0066] In addition, please refer to Figure 4 、 Figure 5 , the lifting motion module 700 is further arranged on the horizontal motion table 602, the lifting motion module 700 includes guide column 701, lifting motion table 702 and second lead screw 703, that is, the guide column 701 is fixedly connected on the horizontal motion table 602, the lifting motion table 702 is slidably connected on the guide column 701, and the second lead screw 703 is threadedly connected on the lifting motion table 702, the power input mechanism 704 is arranged on the horizontal motion table 602, the power input mechanism 704 is power connected with the second lead screw 703, and the power generating piece 705 is arranged on the installation platform 101 in cooperation with the power input mechanism 704, when the linear motion module 600 drives the power input mechanism 704 to move linearly, the power input mechanism 704 cooperates with the power generating piece 705 to realize the lifting motion of the lifting motion table 702, so that the driving source of the lifting motion module 700 can be reduced, and the driving motor in the altitude cabin 100 is avoided, so that the failure rate of the whole device is low;

[0067] Further, please refer to Figure 5 , Figure 6 In this embodiment, the power input mechanism 704 includes a worm 7041, a worm wheel 7042, and a gear 7043, that is, the worm wheel 7042 is fixedly connected to the bottom end of the second lead screw 703, the worm 7041 is rotatably connected to the horizontal movement table 602, the worm 7041 is meshingly connected to the worm wheel 7042, the gear 7043 is fixedly connected to the worm 7041, and the power generation piece 705 is matched with the gear 7043 by using a rack. In this way, the self-locking effect of the worm 7041 and the worm wheel 7042 can ensure the stability of the lifting movement table 702 after lifting. To ensure the lifting stability, two groups of second lead screws 703 can be threadedly connected to the lifting movement table 702, and each group of second lead screws 703 is fixedly connected with a worm wheel 7042. The horizontal movement table 602 is rotatably connected with a worm 7041 corresponding to each group of worm wheels 7042, and the two groups of worms 7041 are connected by a shaft.

[0068] Further, please refer to Figure 7 , Figure 8 The mounting seat 102 is fixedly connected to the top side of the lifting movement table 702. In this way, the mounting seat 102 is low in the original state, so that the generator can be easily installed. After the engine is installed on the mounting seat 102, the linear movement module 600 can drive the generator to move towards the power output device 300. At the same time, the lifting movement module 700 drives the generator to rise. When the gear 7043 is disengaged from the rack, the generator reaches the predetermined height. Then, the linear movement module 600 continues to drive the generator to move linearly until the spline part 401 is connected to the spline sleeve shaft. Embodiment

[0069] Please refer to Figure 3 , Figure 4 The engine altitude cabin power test device. Based on the embodiment 2, further, when the transmission shaft is connected to the power input coupling 312, if the spline part 401 does not match the spline sleeve shaft, manual rotation of the transmission shaft 400 or the connecting shaft 500 is needed. Both the transmission shaft 400 and the connecting shaft 500 need a large force to rotate, which is time-consuming and laborious. Therefore, the embodiment is optimized as follows:

[0070] In the embodiment, the outer wall of the altitude cabin 100 is provided with a docking driving mechanism 800 near the power output device 300. The docking driving mechanism 800 is in power connection with the transmission shaft 400, so that the transmission shaft 400 is driven to rotate through the docking driving mechanism 800, so that the spline part 401 is engaged with the spline sleeve shaft. Specifically, the docking driving mechanism 800 comprises a mounting rack 801, a first gear 802, a second gear 803, a second driving motor 804, and an output shaft 805. The mounting rack 801 is fixedly connected to the cabin wall. The second driving motor 804 is fixedly connected to the mounting rack 801. The output shaft 805 is in power connection with the second driving motor 804. The first gear 802 is fixedly connected to the output shaft 805. The second gear 803 is fixedly connected to the connecting shaft 500. The first gear 802 is in meshing connection with the second gear 803. Embodiment

[0071] Please refer to Figures 7-11 , the engine altitude cabin power test device. Based on the embodiment 3, further, in order to avoid the influence of the docking driving mechanism 800 on the test effect, the output shaft 805 in the embodiment is selected as follows:

[0072] Please refer to Figure 11 , the output shaft 805 comprises a main sleeve shaft 8051, a telescopic shaft 8052, and a first spring 8053. That is, the main sleeve shaft 8051 is rotatably connected to the mounting rack 801. The main sleeve shaft 8051 is in power connection with the second driving motor 804. The main sleeve shaft 8051 is provided with a movement cavity 8054. The movement cavity 8054 is provided with a spline groove 8055. The telescopic shaft 8052 is fixedly connected with a spline bar 8056. The spline bar 8056 is slidably connected in the spline groove 8055. The first spring 8053 is fixedly connected in the movement cavity 8054. The first spring 8053 is fixedly connected with the telescopic shaft 8052. The first gear 802 is fixedly connected to the telescopic shaft 8052.

[0073] Further, please refer to Figures 7-10 , the cabin wall is provided with a pushing piece 900 matched with the first gear 802. The pushing piece 900 comprises a movement shaft 901, a pushing head 902, a second spring 903, and a sealing table 904. That is, the movement shaft 901 is slidably connected to the cabin wall. A sealing sleeve is arranged between the movement shaft 901 and the cabin wall. The pushing head 902 is fixedly connected to the outer end of the movement shaft 901. The pushing head 902 is in abutment with the first gear 802. A limiting table is fixedly connected to the outer region of the movement shaft 901. The second spring 903 is sleeved on the movement shaft 901. One end of the second spring 903 is fixedly connected with the limiting table, and the other end is fixedly connected with the cabin wall. The sealing table 904 is fixedly connected to the inner region of the movement shaft 901. The sealing table 904 is provided with a sealing ring.

[0074] Further, the push frame 1000 is arranged on the mounting base 102 corresponding to the movement shaft 901, when the mounting base 102 is linearly moved by the linear motion module 600, the push frame 1000 can linearly push the movement shaft 901, the movement shaft 901 can drive the push head 902 to linearly push the first gear 802, at this time, the telescopic shaft 8052 moves towards the main sleeve shaft 8051, the first spring 8053 is compressed, so that the first gear 802 is dislocated with the second gear 803, and at this time, the sealing ring is in contact with the inner wall of the cabin wall, so as to further improve the sealing performance of the altitude cabin 100;

[0075] When the push frame 1000 does not push the movement shaft 901, under the elastic force of the first spring 8053, the telescopic shaft 8052 drives the first gear 802 to move towards the second gear 803, and when the first gear 802 and the second gear 803 are not matched, the first spring 8053 is still in the compressed state, when the second driving motor 804 drives the first gear 802 to rotate and match the second gear 803, under the action of the first spring 8053, the two gears are engaged.

[0076] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of the equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0077] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. An engine altitude chamber power test device, comprising an altitude chamber (100), a dynamometer (200), and a power output device (300), the bottom surface of the altitude chamber (100) is provided with a mounting platform (101), a mounting seat (102) is fixedly installed on the mounting platform (101), and an engine is connected to the mounting seat (102), characterized in that: The altitude cabin (100) is fixedly connected with a dynamometer (200) outside, a power output device (300) is connected to the cabin wall of the altitude cabin (100), the power output end of the engine is connected with the power output device (300) through a transmission shaft (400), and the power output device (300) is connected with the dynamometer (200) through a connecting shaft (500). The power output device (300) comprises a bearing seat (303) and a transmission main shaft (304) rotatably connected to the bearing seat (303), a static pressure cavity (305) is arranged between the transmission main shaft (304) and the bearing seat (303), sealing rings (306) are arranged on both sides of the static pressure cavity (305) between the transmission main shaft (304) and the bearing seat (303), bearings (307) are connected to both ends of the bearing seat (303), the transmission main shaft (304) is matched with the bearings (307), a balance cavity (308) is arranged between the bearings (307) and the sealing rings (306), balance air channels (309) are arranged on the bearing seat (303) and communicate with the balance cavity (308), one group of balance air channels (309) communicate with the inside of the altitude cabin (100), another group of balance air channels (309) communicate with the outside of the altitude cabin (100), the static pressure cavity (305) communicates with a balance pipe (311), the balance pipe (311) is connected with a vacuum pump, one end of the transmission main shaft (304) is connected with the transmission shaft (400), and the other end is connected with the connecting shaft (500).

2. The engine altitude chamber power test device of claim 1, wherein: The power output device (300) further comprises a mounting shell (301), a sealing connecting sleeve (302), a power output coupling (313) and a power input coupling (312), the sealing connecting sleeve (302) is fixedly connected to the mounting shell (301), the mounting shell (301) is fixedly connected to the cabin wall, the bearing seat (303) is fixedly connected to the sealing connecting sleeve (302), the sealing connecting sleeve (302) is fixedly connected to the balance pipe (311), the vacuum air channel (310) is arranged in the bearing seat (303) and communicates with the static pressure cavity (305), the balance pipe (311) communicates with the vacuum air channel (310), one end of the transmission main shaft (304) is fixedly connected with the power input coupling (312), the power input coupling (312) is connected with the transmission shaft (400), the other end of the transmission main shaft (304) is fixedly connected with the power output coupling (313), and the power output coupling (313) is connected with the connecting shaft (500).

3. The engine altitude chamber power test device of claim 2, wherein: The installation platform (101) is internally provided with a linear motion module (600), the linear motion module (600) comprises a horizontal motion table (602), the horizontal motion table (602) is provided with a lifting motion module (700), the lifting motion module (700) comprises a lifting motion table (702), and the lifting motion table (702) is fixedly connected with the mounting seat (102); One end of the transmission shaft (400) is fixedly connected with the power output end of the engine, the other end is provided with a spline part (401), the power input coupling (312) is matched with the spline part (401) by using a spline sleeve shaft, and the linear motion module (600) and the lifting motion module (700) can drive the engine to move, so that the spline part (401) is inserted into the power input coupling (312).

4. The engine altitude chamber power test device of claim 3, wherein: The lifting motion module (700) comprises a power input mechanism (704), the installation platform (101) is provided with a power generating piece (705) matched with the power input mechanism (704), when the linear motion module (600) drives the power input mechanism (704) to move linearly, the power input mechanism (704) is matched with the power generating piece (705), and the lifting motion of the lifting motion table (702) can be realized.

5. The engine altitude chamber power test device of claim 4, wherein: The linear motion module (600) further comprises a guide rail (601), a speed reducer (603), a first lead screw (604) and a first drive motor (605), the guide rail (601) is fixedly connected to the installation platform (101), the horizontal motion table (602) is slidably connected to the guide rail (601), the first lead screw (604) is threadedly connected to the horizontal motion table (602), the speed reducer (603) is fixedly connected to the installation platform (101), a power output end of the speed reducer (603) is connected with the first lead screw (604), and the first drive motor (605) is fixedly connected to the outside of the installation platform (101) and is connected with a power input end of the speed reducer (603); The lifting motion module (700) further comprises a guide column (701) and a second lead screw (703), the guide column (701) is fixedly connected to the horizontal motion table (602), the lifting motion table (702) is slidably connected to the guide column (701), the second lead screw (703) is threadedly connected to the lifting motion table (702), and the power input mechanism (704) is arranged on the horizontal motion table (602) and is connected with the second lead screw (703).

6. The engine altitude chamber power test device of claim 5, wherein: The power input mechanism (704) comprises a worm (7041), a worm wheel (7042) and a gear (7043), the bottom end of the second lead screw (703) is fixedly connected with the worm wheel (7042), the horizontal movement table (602) is rotationally connected with the worm (7041), the worm (7041) is meshingly connected with the worm wheel (7042), the gear (7043) is fixedly connected to the worm (7041), and the power generation piece (705) is matched with the gear (7043) in the form of a rack.

7. The engine altitude chamber power test device of claim 3, wherein: An abutment driving mechanism (800) is arranged on the outer wall of the altitude cabin (100) and close to the power output device (300), and the abutment driving mechanism (800) is power-connected with the transmission shaft (400).

8. The engine altitude chamber power test device of claim 7, wherein: The abutment driving mechanism (800) comprises a mounting rack (801), a first gear (802), a second gear (803), a second driving motor (804) and an output shaft piece (805), the mounting rack (801) is fixedly connected to the cabin wall, the second driving motor (804) is fixedly connected to the mounting rack (801), the output shaft piece (805) is power-connected with the second driving motor (804), the first gear (802) is fixedly connected to the output shaft piece (805), and the second gear (803) is fixedly connected to the connecting shaft (500), and the first gear (802) is meshingly connected with the second gear (803).

9. The engine altitude chamber power test device of claim 8, wherein: The output shaft piece (805) comprises a main sleeve shaft (8051), an extension shaft (8052) and a first spring (8053), the main sleeve shaft (8051) is rotationally connected to the mounting rack (801) and power-connected with the second driving motor (804), the main sleeve shaft (8051) is provided with a movement cavity (8054), the movement cavity (8054) is provided with a spline groove (8055) therein, the extension shaft (8052) is fixedly connected with a spline bar (8056), the spline bar (8056) is slidingly connected in the spline groove (8055), the first spring (8053) is fixedly connected in the movement cavity (8054) and fixedly connected with the extension shaft (8052), and the first gear (802) is fixedly connected to the extension shaft (8052). The cabin wall is provided with a pushing piece (900) matched with the first gear (802), the mounting seat (102) is provided with a pushing frame (1000) corresponding to the pushing piece (900), the pushing frame (1000) can push the pushing piece (900) linearly when the mounting seat (102) moves linearly, the pushing piece (900) can push the first gear (802) to move linearly, and the first gear (802) is dislocated with the second gear (803).

10. The engine altitude chamber power test device of claim 9, wherein: The pushing piece (900) comprises a movement shaft (901), a pushing head (902), a second spring (903) and a sealing table (904), the movement shaft (901) is slidably connected with the cabin wall, a sealing sleeve is arranged between the movement shaft (901) and the cabin wall, the outer end of the movement shaft (901) is fixedly connected with the pushing head (902), the pushing head (902) is in abutment with the first gear (802), the outer region of the movement shaft (901) is fixedly connected with a limiting table, the movement shaft (901) is sleeved with the second spring (903), one end of the second spring (903) is fixedly connected with the limiting table, the other end is fixedly connected with the cabin wall, the inner region of the movement shaft (901) is fixedly connected with the sealing table (904), the sealing table (904) is provided with a sealing ring, after the pushing head (902) pushes the first gear (802) to be dislocated with the second gear (803), the sealing ring is in abutment with the inner wall of the cabin wall.

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