Isolation sealing structure of signal transmission equipment and dynamic stress measuring device with isolation sealing structure

Abstract

The invention discloses a signal transmission equipment isolation sealing structure and a dynamic stress measuring device with the same. The signal transmission equipment isolation sealing structure comprises an air inlet cone, an engine support, an electricity guiding device, an electricity guiding device mounting seat and a sealing connecting shaft group. An inner cavity of the engine support forms an engine lubricating oil cavity, and the electricity guiding device installation base is located in the engine lubricating oil cavity and connected with the engine support in a sealed mode. The electricity leading device is arranged in the electricity leading device mounting seat, and the front end of the electricity leading device extends into the mounting seat inner shaft cavity of the electricity leading device mounting seat. The sealing connecting shaft set is located in the engine lubricating oil cavity, the first end of the sealing connecting shaft set is fixedly connected with an engine rotor shaft of the engine, and the second end of the sealing connecting shaft set penetrates through the installation base inner shaft cavity in a sealed mode in the axial direction to be connected with the electricity guiding device floating shaft of the electricity guiding device. The electric conduction device can effectively prevent the electric conduction device front bearing from being overheated to cause normal work, does not need to be filled with a cooling medium, and does not cause oil leakage and gas leakage of an engine due to the fact that cooling gas enters an engine lubricating oil cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic stress measurement of aeroengine rotor blades, and in particular, to a signal transmission device isolation sealing structure. In addition, the present invention also relates to a dynamic stress measurement device having the above signal transmission device isolation sealing structure. Background Art

[0002] Military specifications and civil aviation airworthiness regulations stipulate that dynamic stress measurement tests of rotor blades are required during the development of aviation gas turbine engines to provide a basis for the assessment of blade strength, life and reliability. The signal transmission device is used to convert the vibration strain signal of the blade in a rotating state into a static electrical signal during the dynamic stress measurement process. It generally includes a fuse and a telemetry system. It is an essential equipment in the dynamic stress measurement test. In the blade dynamic stress measurement test, it is often due to unreasonable installation of the signal transmission device or failure to take thermal insulation protection measures, resulting in overheating during operation, which leads to the failure of the dynamic stress measurement test. Therefore, the installation problem of the signal transmission device is a "shortcoming" that needs to be solved in the blade dynamic stress measurement test.

[0003] Chinese patent CN108844623B discloses a scheme for measuring the dynamic stress of high-pressure compressor rotor blades using a telemetry system as a signal transmission device, cooling the telemetry device through a nitrogen cooling mechanism, sealing the pipe assembly using end faces, rubber rings, cones and plug-in methods, and sealing the front sealing seat, thereby improving the cooling efficiency of nitrogen and providing a guarantee for the stability and long-term operation of the telemetry device. However, the patent uses liquid nitrogen for cooling, which is only suitable for component testing. If liquid nitrogen is passed through the entire machine, the engine is likely to experience temperature distortion and surge.

[0004] Chinese patent CN113654701B discloses a sealing system for cooling a signal transmission device in the dynamic stress measurement of a rotor blade. The sealing system forms an inner chamber in the induction device installation cavity through a sealing cover plate, an induction device (signal transmission device), and an induction device mounting seat. An adjustable air source is used to ventilate the inner chamber, and the ventilation air pressure is controlled to be slightly greater than the lubricating oil chamber pressure, so that the oil and gas in the lubricating oil chamber will not enter the sealing chamber, thereby achieving cooling of the induction device, and a pressure sensor is installed on the load-bearing casing to monitor the pressure in the lubricating oil chamber. In this patent, it is required to inflate the chamber where the fuse is located to cool it down, which requires that the test bench must be equipped with an adjustable pressure device, and the pressure in the chamber where the fuse is located is required to be slightly higher than that in the lubricating oil chamber during inflation. In fact, the pressure in the lubricating oil chamber changes rapidly under different working conditions (speeds) of the engine, so the adjustable pressure device needs to have high pressure regulation accuracy and tracking performance; the patent also requires a pressure measuring point to be set in the lubricating oil chamber, and the vehicle platform needs to be equipped with a pressure sensor and pressure measuring equipment; in addition, there is no seal between the oil baffle cover and the lead tube, and the pressure in the cavity of the fuse is required to be slightly higher than that in the lubricating oil chamber during inflation. The cooling air with a certain pressure filled in the cavity of the fuse will overflow into the lubricating oil chamber, thereby increasing the pressure in the lubricating oil chamber, which may cause oil and air leakage in the engine, affecting its normal operation. Therefore, the use of this solution has high requirements for the vehicle platform equipment and limited use conditions; secondly, there is no sealing isolation between the fuse and the lubricating oil chamber, which will affect the pressure of the lubricating oil chamber, which may cause oil and air leakage in the engine.

[0005] Chinese patent CN114295382B discloses an air intake casing structure, where the test line and the fuse's own pipeline are led out from the designed casing, and air is flushed into the inner cavity where the fuse is located to cool the fuse. Similar to patent CN113654701B, there is no sealed isolation between the fuse and the engine, and cooling air needs to be flushed into the fuse cavity. The flushed cooling air will enter the engine lubricating oil cavity through the front end of the fuse, which may cause oil and air leakage in the engine.

[0006] At the same time, in the existing scheme, the pipelines and test lines of the signal transmission device itself are all punched on the intake cone (such as Figure 1 When the pipelines and test lines are led out radially, they will pass through the engine air intake. If there are many pipelines and test lines, the diameter after bundling is large, which may affect the axial air intake of the engine.

[0007] Therefore, the existing isolation and cooling devices for signal transmission equipment have the following disadvantages: 1) The use of cooling medium has limitations: liquid nitrogen cannot meet the requirements of the whole machine test, and the inflation method has high requirements on the vehicle platform and may cause oil and air leakage in the engine; 2) The front end of the induction device is located in the engine oil cavity. There is no sealing isolation between the induction device and the oil cavity. When inflating, it will affect the pressure of the oil cavity, which may cause oil and air leakage in the engine; 3) The test wires and the pipelines of the fuse itself are all led out radially from the engine air intake. If the diameter is large after bundling, it may affect the axial air intake of the engine. Summary of the invention

[0008] The present invention provides a signal transmission equipment isolation sealing structure and a dynamic stress measuring device having the same, so as to solve the technical problems that the existing devices have high requirements on vehicle platform equipment and may cause oil leakage and air leakage in the engine.

[0009] The technical solution adopted by the present invention is as follows: A signal transmission equipment isolation sealing structure comprises: an intake cone and an engine support which are axially connected and hollowly arranged respectively, a fuse for converting the vibration strain signal of the blade in a rotating state into a static electrical signal, a fuse mounting seat for mounting the supporting fuse, and a sealed connecting shaft group which plays a connecting and sealing role; the inner cavity of the engine support forms an engine lubricating oil cavity, the fuse mounting seat is located in the engine lubricating oil cavity, and is sealed and connected to the engine support to seal and isolate the engine lubricating oil cavity from connecting to the inner cavity of the intake cone through the gap between the fuse mounting seat and the engine support; the fuse is axially installed in an inner shaft cavity of the mounting seat axially penetrating the fuse mounting seat, and the front end of the fuse extends into the cavity of the intake cone; the sealed connecting shaft group is located in the engine lubricating oil cavity, and the first end of the sealed connecting shaft group is fixedly connected to the engine rotor shaft of the engine, and the second end of the sealed connecting shaft group is axially sealed and penetrates the inner shaft cavity of the mounting seat to connect the fuse floating shaft of the fuse, and at the same time, the connection between the engine lubricating oil cavity and the inner shaft cavity of the mounting seat is sealed and isolated.

[0010] Furthermore, the sealing connection shaft group includes a sealing shaft for connecting, a sealing ring for sealing and an axial retaining ring for limiting; the first end of the sealing shaft is fixedly connected to the engine rotor shaft, and the second end of the sealing shaft is axially extended into the inner shaft cavity of the mounting seat and then connected to the floating shaft of the fuse; the sealing ring and the axial retaining ring are axially installed on the inner circle of the fuse mounting seat in sequence, and the sealing card is arranged between the outer cylindrical surface of the sealing shaft and the inner cylindrical surface of the inner shaft cavity of the mounting seat to seal and cut off the connection between the engine lubricating oil cavity and the inner shaft cavity of the mounting seat.

[0011] Furthermore, an inner side wall of the inner shaft cavity of the mounting seat at the first end of the current-generating device mounting seat is provided with an inwardly concave and annular mounting ring groove, and an axial retaining ring is limitedly installed in the mounting ring groove; the inner wall surface of the inner shaft cavity of the mounting seat at the first end of the current-generating device mounting seat also protrudes toward the center to form a limiting flange, the limiting flange is located on the inner side of the mounting ring groove, and the sealing ring is limitedly located between the mounting flange and the axial retaining ring.

[0012] Furthermore, the first end of the sealing shaft is axially interference-inserted into the front journal of the engine rotor shaft; the second end of the sealing shaft is axially concave to form an accommodating cavity, and the first end of the floating shaft of the current generator extends axially into the accommodating cavity and is fixedly connected to the sealing shaft.

[0013] Furthermore, the outer diameter of the first end of the sealing shaft is greater than the outer diameter of the second end thereof, and the first end of the sealing shaft is also provided with a plurality of ventilation grooves running axially therethrough, the ventilation grooves being used to connect the center pull rod in the engine rotor shaft with the engine lubricating oil cavity.

[0014] Furthermore, the fuse mounting seat includes an axially connected and disc-shaped mounting plate and a cylindrical mounting tube, and the inner axial cavity of the mounting seat axially penetrates the mounting plate and the mounting tube; the sealing ring and the axial retaining ring are both clamped in the inner axial cavity of the mounting seat of the mounting tube; the end surface of the mounting plate is concavely extended to form a mounting cavity for accommodating the fuse and for limiting the fuse, and the mounting plate is also detachably connected to the engine support.

[0015] Furthermore, the outer wall surface of the mounting plate protrudes outward to form an annular mounting flange, the side wall surface of the mounting flange abuts against the end surface of the engine support, and is fixed to the engine support by mounting bolts passing through the two.

[0016] Furthermore, a plurality of embedded pipe joints are embedded in the inner and outer walls of the mounting plate, and the plurality of embedded pipe joints on the inner wall are arranged one-to-one with the plurality of embedded pipe joints on the outer wall, and are connected through channels opened in the mounting plate; the signal transmission equipment isolation sealing structure also includes a plurality of bendable connecting pipes, the first ends of the plurality of connecting pipes are connected one-to-one with the plurality of delivery pipes of the fuse, and the second ends of the plurality of connecting pipes are connected one-to-one with the plurality of embedded pipe joints on the inner wall of the mounting plate.

[0017] Furthermore, the mounting plate is also processed with vertical channels and transverse channels that intersect vertically and are respectively arranged through the mounting plate; the air intake end of the vertical channel is connected to the inner shaft cavity of the mounting seat of the induction device mounting seat, and the exhaust end of the vertical channel is blocked by a plugging cover; the air intake end of the transverse channel is connected to the inner cavity of the intake cone of the intake cone, and the exhaust end of the transverse channel is connected to the air duct used for exhaust, and the exhaust pipe extends outward after passing through the engine support.

[0018] According to another aspect of the present invention, there is also provided a dynamic stress measuring device having a signal transmission device isolation and sealing structure as described above.

[0019] The present invention has the following beneficial effects: The present invention designs an isolation sealing structure for signal transmission equipment, in which the isolation sealing structure prevents the engine oil cavity from communicating with the inner cavity of the intake cone through the gap between the electric discharge device mounting seat and the engine support, and at the same time, the second end of the sealing connection shaft group is axially sealed and penetrates the inner axial cavity of the mounting seat, thereby isolating the communication between the engine oil cavity and the inner axial cavity of the electric discharge device mounting seat, that is, isolating the communication between the engine oil cavity and the inner cavity of the intake cone, so that the inner cavity of the intake cone is connected to the inner axial cavity of the mounting seat to form a sealed cavity isolated from the engine oil cavity, and the electric discharge device is sealed in the sealed cavity, thereby effectively preventing the electric discharge device front bearing from overheating and causing it to fail to work normally, and solving the problem that the engine fails to reach the specified speed due to the electric discharge device failing to work normally due to overheating; and it does not need to be filled with liquid nitrogen, so it is suitable for whole machine testing and will not cause the engine to overheat. The invention also does not require air cooling or other cooling media, so it has no special requirements for the test bench. The test bench has a simple structure and low cost, and the engine will not leak oil or air due to the cooling air entering the engine oil cavity. When the structure of the present invention is applied to a dynamic stress measurement test of a certain type of engine compressor rotor blade, it is confirmed that the engine oil cavity can be effectively isolated from the front end of the induction device. At the highest engine speed, the temperature of the front bearing of the induction device is also within the normal range, the induction device cooling and bearing lubrication systems work normally, the engine body does not leak oil or air, the induction device works stably, and the output signal is normal. At the same time, after using the structure, the vibration strain data at the highest engine speed (46,000 rpm) is measured, the induction device works normally, and the dynamic stress measurement test is successful. At the same time, the structure has high reliability and strong versatility, does not need to be filled with cooling media, and has no effect on the engine oil circuit and gas circuit.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a structural schematic diagram of an isolation sealing device for existing signal transmission equipment; Figure 2 It is a schematic diagram of the main structure of the fuse; Figure 3 It is a schematic diagram of the original structure of the engine at the installation position of the induction device; Figure 4 It is a schematic diagram of the cross-sectional front view of the induction device mounting seat of the preferred embodiment of the present invention; Figure 5 It is a schematic diagram of the main structure of the signal transmission equipment isolation and sealing structure of the preferred embodiment of the present invention; Figure 6 yes Figure 5 Partial schematic diagram of the installation of the middle sealing ring and the axial retaining ring; Figure 7 yes Figure 5 A schematic diagram of the cross-sectional front view of the middle sealing shaft; Figure 8 yes Figure 5 Schematic diagram of the middle seal connecting shaft assembly and rotor connection; Fig. 9 yes Figure 5 Schematic diagram of embedded pipe joints on the central electrical installation base; Fig.10 yes Figure 5 The schematic diagram of the induction device mounting seat structure viewed from the engine outlet to the engine inlet; Fig.11 yes Figure 5 The piping arrangement diagram of the engine inlet end viewed from the engine inlet to the engine outlet; Fig.12 yes Figure 5 Design plan for oil and gas lubrication gas discharge of Zhongyin electrical equipment; Fig.13 yes Fig.12 Schematic diagram of the local enlarged structure.

[0022] Legend: 1. Intake cone; 101. Inner cavity of intake cone; 2. Engine support; 201. Engine oil cavity; 3. Electric induction device; 31. Electric induction device floating shaft; 4. Induction device mounting seat; 401. Shaft cavity in mounting seat; 402. Position limiting flange; 403. Mounting flange; 404. Vertical channel; 405. Horizontal channel; 41. Mounting plate; 42. Mounting cylinder; 5. Sealed connecting shaft assembly; 51. Sealed shaft; 511. Accommodating cavity; 512. Ventilation groove; 52. Sealing ring; 53. Axial retaining ring; 61. Engine rotor shaft; 62. Center tie rod; 7. Embedded pipe joint; 8. Connecting pipe; 9. Plug cover; 10. Air duct; 11. Mounting bolts; 12. Oil chamber sealing plate; 13. Support assembly; 14. Electric induction pipeline and test line interface. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0024] Reference Figure 2-Figure 3 and Figure 5 The preferred embodiment of the present invention provides a signal transmission equipment isolation sealing structure, comprising: an intake cone 1 and an engine support 2 connected in the axial direction and respectively arranged hollow, a galvanometer 3 for converting the vibration strain signal of the blade in the rotating state into a static electrical signal, a galvanometer mounting seat 4 for mounting the supporting galvanometer 3, and a sealing connection shaft group 5 for connecting and sealing. The inner cavity of the engine support 2 forms an engine lubricating oil cavity 201, and the galvanometer mounting seat 4 is located in the engine lubricating oil cavity 201 and is sealed and connected to the engine support 2 to seal and isolate the engine lubricating oil cavity 201 from connecting to the intake cone inner cavity 101 in the intake cone 1 through the gap between the galvanometer mounting seat 4 and the engine support 2. The galvanometer 3 is axially installed in the mounting seat inner shaft cavity 401 axially penetrating in the galvanometer mounting seat 4, and the front end of the galvanometer 3 extends into the intake cone inner cavity 101 of the intake cone 1. The sealed connecting shaft group 5 is located in the engine oil cavity 201, and the first end of the sealed connecting shaft group 5 is fixedly connected to the engine rotor shaft 61 of the engine, and the second end of the sealed connecting shaft group 5 is axially sealed and penetrates the inner shaft cavity 401 of the mounting seat to connect the fuse floating shaft 31 of the fuse 3, while sealing and isolating the connection between the engine oil cavity 201 and the inner shaft cavity 401 of the mounting seat.

[0025] During the design, since the structure of the induction device is much more complicated than that of the telemetry system, the telemetry system has no coolant and oil mist lubrication pipe, and the maximum operating temperature of the telemetry system can reach 125°C, while the induction device can only reach 85°C, the induction device is used in the signal transmission device of the present invention for illustration. The induction device 3 is used as the signal transmission device, such as Figure 2 As shown, the maximum operating speed can reach 70,000 rpm. The internal core component is a brush ring and brush wire structure, which can convert the vibration strain signal of the rotor into an electrical signal output. Its accompanying pipelines include a coolant inlet pipe, a coolant return pipe (for cooling the brush ring and brush wire) and two oil mist lubrication pipes (for lubricating and cooling the front and rear bearings).

[0026] The present invention designs an isolation sealing structure for signal transmission equipment, in which the isolation sealing structure prevents the engine oil cavity 201 from communicating with the intake cone inner cavity 101 of the intake cone 1 through the gap between the electric induction device mounting seat 4 and the engine support 2, and at the same time, the second end of the sealing connection shaft group 5 is axially sealed and penetrates the mounting seat inner shaft cavity 401, thereby isolating the communication between the engine oil cavity 201 and the mounting seat inner shaft cavity 401 in the electric induction device mounting seat 4, that is, isolating the communication between the engine oil cavity 201 and the intake cone inner cavity 101 in the intake cone 1, so that the intake cone inner cavity 101 is connected to the mounting seat inner shaft cavity 401 to form a sealed cavity isolated from the engine oil cavity 201, and the electric induction device 3 is sealed in the sealed cavity, thereby effectively preventing the electric induction device front bearing from overheating and causing it to fail to work normally, thereby solving the problem that the engine fails to reach the specified speed test due to the electric induction device failing to work normally due to overheating; and it does not need to be filled with liquid Nitrogen, so it is suitable for whole machine test, and will not cause temperature distortion and surge of the engine. At the same time, it does not need to bleed air for cooling or fill other cooling media, so it has no special requirements for the test bench. The test bench has a simple structure and low cost, and will not cause oil leakage and air leakage in the engine due to cooling air entering the engine lubricating oil cavity. When the structure of the present invention is applied to a dynamic stress measurement test of a certain type of engine compressor rotor blade, it is confirmed that it can effectively isolate the engine lubricating oil cavity from the front end of the ignition device. At the highest engine speed, the temperature of the front bearing of the ignition device is also within the normal range, the ignition device cooling and bearing lubrication systems work normally, the engine body does not leak oil or air, the ignition device works stably, and the output signal is normal. At the same time, after using the structure, the vibration strain data at the highest engine speed (46000 rpm) is measured, the ignition device works normally, and the dynamic stress measurement test is successful. At the same time, the structure has high reliability and strong versatility, does not need to be filled with cooling medium, and has no effect on the engine oil circuit and gas circuit.

[0027] Alternatively, if Figure 6As shown, the sealed connecting shaft assembly 5 includes a sealing shaft 51 for connection, a sealing ring 52 for sealing, and an axial retaining ring 53 for limiting. The first end of the sealing shaft 51 is fixedly connected to the engine rotor shaft 61, and the second end of the sealing shaft 51 is axially extended into the inner shaft cavity 401 of the mounting seat and then connected to the induced current floating shaft 31. The sealing ring 52 and the axial retaining ring 53 are sequentially installed on the inner circle of the induced current mounting seat along the axial direction, and the sealing card is arranged between the outer cylindrical surface of the sealing shaft 51 and the inner cylindrical surface of the inner shaft cavity 401 of the mounting seat to seal and cut off the communication between the engine lubricating oil cavity 201 and the inner shaft cavity 401 of the mounting seat. In this optional scheme, the sealing ring 52 is a lip-shaped sealing ring. In this optional scheme, the sealing structure adopts a lip-shaped dynamic seal, and its installation position is set on the induction device mounting seat 4. One side of the lip-shaped sealing ring is axially positioned by a designed elastic retaining ring. The design pressure of the lip-shaped sealing ring needs to consider the pressure of the intake cone inner cavity 101, the mounting seat inner shaft cavity 401 and the engine lubricating oil cavity 201. During operation, the purpose of isolating the intake cone inner cavity 101 and the mounting seat inner shaft cavity 401 from the engine lubricating oil cavity 201 is achieved through the design of the installation position and structure of the lip-shaped sealing ring. The lip-shaped sealing ring contacts the sealing shaft 51 to achieve dynamic sealing, and one side of it is also axially positioned by an axial retaining ring 53.

[0028] In this option, if Figure 6 As shown, a concave and annular mounting groove is provided on the inner side wall of the mounting seat inner shaft cavity 401 at the first end of the lead-in device mounting seat 4, and the axial retaining ring 53 is limitedly installed in the mounting groove. The inner wall surface of the mounting seat inner shaft cavity 401 at the first end of the lead-in device mounting seat 4 also protrudes toward the center to form a limiting flange 402, which is located on the inner side of the mounting groove, and the sealing ring 52 is limited between the limiting flange 402 and the axial retaining ring 53.

[0029] In this option, if Figure 5 , Figure 7-Figure 8 As shown, the first end of the sealing shaft 51 is inserted into the front journal of the engine rotor shaft 61 through interference along the axial direction. The second end of the sealing shaft 51 is concave inward along the axial direction to form a receiving cavity 511, and the first end of the induced current floating shaft 31 extends into the receiving cavity 511 along the axial direction and is fixedly connected to the sealing shaft 51. In this optional solution, the sealing shaft 51 is specially designed, one end of the sealing shaft 51 is connected to the engine rotor shaft 61, and the other end is connected to the induced current floating shaft 31, and the coupling and sealing functions are realized at the same time; the sealing shaft 51 is interference fit with the front journal of the engine for torque transmission and axial positioning, and forms a dynamic seal with the lip seal ring at the same time.

[0030] Preferably, if Figure 7-Figure 8As shown, the outer diameter of the first end of the sealing shaft 51 is greater than the outer diameter of the second end thereof. The first end of the sealing shaft 51 is also provided with a plurality of ventilation grooves 512 extending axially therethrough. The ventilation grooves 512 are used to connect the center pull rod 62 in the engine rotor shaft 61 with the engine lubricating oil cavity 201, thereby ensuring that the engine ventilation system meets the design requirements.

[0031] Alternatively, if Figure 4-Figure 5 As shown, the induction device mounting seat 4 includes an axially connected and disc-shaped mounting plate 41 and a cylindrical mounting tube 42, and an inner axial cavity 401 of the mounting seat axially penetrates the mounting plate 41 and the mounting tube 42; the sealing ring 52 and the axial retaining ring 53 are both clamped in the inner axial cavity 401 of the mounting seat of the mounting tube 42; the end surface of the mounting plate 41 is concavely extended to form a mounting cavity for accommodating the induction device 3 and for limiting the induction device 3, and the mounting plate 41 is also detachably connected to the engine support 2.

[0032] Furthermore, if Figure 4 As shown, the outer wall surface of the mounting plate 41 protrudes outward to form an annular mounting flange 403, the side wall surface of the mounting flange 403 abuts against the end surface of the engine support 2, and is fixed to the engine support 2 by mounting bolts passing through the two. Figure 3 As shown, a fuse mounting seat 4 is designed, and the fuse 3 is installed on the engine support 2 through the mounting flange 403 by using the original mounting bolts 11 of the engine support assembly. At the same time, the original lubricating oil chamber sealing plate 12 is cancelled, and a structure that can realize the sealing function is also designed on the fuse mounting seat 4. At the same time, a sealing shaft 51 is designed to cooperate with the sealing structure on the fuse mounting seat 4 to realize the sealing function, so as to prevent the high-temperature oil and gas in the engine lubricating oil chamber 201 from entering the front end of the fuse 3, so as to avoid the fuse 3 from overheating and failing to work normally due to poor heat dissipation of the bearing.

[0033] Alternatively, if Figure 5 , Figure 9-11As shown, a plurality of pre-buried pipe joints 7 are pre-buried in each of the inner and outer side walls of the mounting plate 41, and the plurality of pre-buried pipe joints 7 on the inner side wall are arranged one-to-one with the plurality of pre-buried pipe joints 7 on the outer side wall, and are connected through a channel opened in the mounting plate 41. The signal transmission equipment isolation sealing structure also includes a plurality of bendable connecting pipes 8, the first ends of the plurality of connecting pipes 8 are connected one-to-one with the plurality of conveying pipes of the lead 3, and the second ends of the plurality of connecting pipes 8 are connected one-to-one with the plurality of pre-buried pipe joints 7 on the inner side wall of the mounting plate 41. During design, the test line and pipeline of the fuse 3 cannot be led out by drilling holes on the air intake cone 1. In the present invention, the support assembly 13 inside the air intake cone 1, the fuse mounting seat 4, and the sealed connecting shaft group 5 enclose the fuse 3 in a sealed cavity. When designing the fuse mounting seat 4, it is also necessary to design the lead-out interface of the pipeline and the test line. Therefore, in the present invention, a pre-buried pipe joint 7 is arranged on the fuse mounting seat 4 and the pipeline is designed to lead out multiple conveying pipes such as the coolant inlet pipe, the coolant return pipe, and the oil mist lubrication pipe on the fuse 3 from the sealed cavity; at the same time, since the space in the sealed cavity where the fuse 3 is located is narrow, four connecting pipes 8 with different shapes and bends, i.e., metal pipes, are designed. One end of the metal pipe is connected to the joints of the coolant inlet pipe, the coolant return pipe, and the two oil mist lubrication pipes, and the other end is connected to the pre-buried pipe joint 7 pre-buried on the inner wall surface of the mounting plate 41. In this optional solution, the design of the metal tube avoids the problem of bending and kinking of the pipe in a narrow space, which may cause blockage of the incoming coolant and oil mist lubrication gas and damage to the fuse. At the same time, the test line and connecting pipe 8 are led out from the casing where the engine oil cavity 201 is located to avoid affecting the engine intake conditions.

[0034] Alternatively, if Figure 12-13 As shown, the mounting plate 41 is also processed with vertical channels 404 and transverse channels 405 that intersect vertically and are respectively set through. The air intake end of the vertical channel 404 is connected to the inner shaft cavity 401 of the mounting seat of the induction device mounting seat 4, and the exhaust end of the vertical channel 404 is blocked by the plug cover 9. The air intake end of the transverse channel 405 is connected to the intake cone inner cavity 101 of the intake cone 1, and the exhaust end of the transverse channel 405 is connected to the exhaust pipe 10 for exhaust, and the exhaust pipe is extended outward after passing through the engine support 2. During the operation of the induction device, it is necessary to introduce an oil-gas mixture with a pressure of (0.6-0.7) MPa to lubricate the bearings of the induction device. The lubricated mixture enters the closed intake cone inner cavity 101 and the inner shaft cavity 401 of the mounting seat. By designing the vertical channel 404 and the transverse channel 405 that intersect and communicate on the induction device mounting seat 4, the oil-gas mixture can be discharged into the atmosphere.

[0035] Optionally, a preferred embodiment of the present invention further provides a dynamic stress measurement device having a signal transmission equipment isolation sealing structure as any of the above items, so that when the dynamic stress measurement device of the present invention is used to measure the dynamic stress of the blade, it can effectively prevent the front bearing of the induction device from overheating and causing it to fail to work normally, thereby solving the problem that the engine test is forced to be interrupted and fails because the induction device fails to work normally due to overheating. At the same time, there is no need to fill cooling medium, so it is suitable for whole machine testing, and will not cause temperature distortion and surge of the engine, nor will it cause oil and air leakage of the engine due to cooling air entering the engine lubricating oil cavity. At the same time, after using the device, the vibration strain data of the engine at the highest speed (46,000 rpm) was obtained, the induction device worked normally, and the dynamic stress measurement test was successful. At the same time, the structure has high reliability and strong versatility, does not need to be filled with cooling medium, and has no effect on the engine oil circuit and gas circuit.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A signal transmission equipment isolation sealing structure, characterized in that: include: An intake cone (1) and an engine support (2) connected in the axial direction and respectively arranged hollow, a fuse (3) for converting a vibration strain signal of a blade in a rotating state into a static electrical signal, a fuse mounting seat (4) for mounting and supporting the fuse (3), and a sealing connection shaft assembly (5) for performing a connection sealing function; The inner cavity of the engine support (2) forms an engine lubricating oil cavity (201), and the induction device mounting seat (4) is located in the engine lubricating oil cavity (201) and is sealed and connected to the engine support (2) so as to seal and isolate the engine lubricating oil cavity (201) and communicate with the inner cavity (101) of the intake cone (1) through the gap between the induction device mounting seat (4) and the engine support (2); The induction device (3) is axially mounted in an inner shaft cavity (401) of the induction device mounting seat (4) and axially penetrates the mounting seat, and the front end of the induction device (3) extends into the inner cavity (101) of the air inlet cone; The sealed connecting shaft group (5) is located in the engine lubricating oil cavity (201), and the first end of the sealed connecting shaft group (5) is fixedly connected to the engine rotor shaft (61) of the engine, and the second end of the sealed connecting shaft group (5) is sealedly penetrated through the inner shaft cavity (401) of the mounting seat along the axial direction to connect to the fuse floating shaft (31) of the fuse (3), while sealingly isolating the communication between the engine lubricating oil cavity (201) and the inner shaft cavity (401) of the mounting seat.

2. The signal transmission equipment isolation sealing structure according to claim 1, characterized in that: The sealed connecting shaft assembly (5) comprises a sealing shaft (51) for connection, a sealing ring (52) for sealing, and an axial retaining ring (53) for limiting. The first end of the sealing shaft (51) is fixedly connected to the engine rotor shaft (61), and the second end of the sealing shaft (51) is axially extended into the inner shaft cavity (401) of the mounting seat and then connected to the floating shaft (31) of the galvanometer. The sealing ring (52) and the axial retaining ring (53) are axially mounted on the inner circle of the galvanometer mounting seat (4) in sequence, and the sealing clamp is arranged between the outer circle surface of the sealing shaft (51) and the inner circle surface of the inner shaft cavity (401) of the mounting seat to seal and cut off the communication between the engine lubricating oil cavity (201) and the inner shaft cavity (401) of the mounting seat.

3. The signal transmission equipment isolation sealing structure according to claim 2, characterized in that: An inner side wall of the mounting seat inner shaft cavity (401) at the first end of the induction device mounting seat (4) is provided with an inwardly concave annular mounting ring groove, and an axial retaining ring (53) is limitedly mounted in the mounting ring groove; an inner wall surface of the mounting seat inner shaft cavity (401) at the first end of the induction device mounting seat (4) further protrudes toward the center to form a limiting flange (402), the limiting flange (402) is located on the inner side of the mounting ring groove, and the sealing ring (52) is limitedly positioned between the limiting flange (402) and the axial retaining ring (53).

4. The signal transmission equipment isolation sealing structure according to claim 2, characterized in that: The first end of the sealing shaft (51) is inserted into the front journal of the engine rotor shaft (61) in an axial interference fit; the second end of the sealing shaft (51) is axially concave to form an accommodation cavity (511); the first end of the floating shaft (31) of the lead-in device extends axially into the accommodation cavity (511) and is fixedly connected to the sealing shaft (51).

5. The signal transmission equipment isolation sealing structure according to claim 4, characterized in that: The outer diameter of the first end of the sealing shaft (51) is greater than the outer diameter of the second end thereof. The first end of the sealing shaft (51) is also provided with a plurality of ventilation grooves (512) extending axially therethrough. The ventilation grooves (512) are used to connect a central pull rod (62) in the engine rotor shaft (61) with the engine lubricating oil cavity (201).

6. The signal transmission equipment isolation sealing structure according to claim 2, characterized in that: The fuse mounting seat (4) comprises a mounting plate (41) and a mounting tube (42) which are connected in the axial direction and are in the shape of a plate; an inner axial cavity (401) of the mounting seat axially penetrates the mounting plate (41) and the mounting tube (42); a sealing ring (52) and an axial retaining ring (53) are both clamped in the inner axial cavity (401) of the mounting tube (42); an end surface of the mounting plate (41) is concavely extended to form a mounting cavity for accommodating the fuse (3) and for abutting and limiting the fuse (3); and the mounting plate (41) is also detachably connected to the engine support (2).

7. The signal transmission equipment isolation sealing structure according to claim 6, characterized in that: The outer wall surface of the mounting plate (41) protrudes outward to form an annular mounting flange (403); the side wall surface of the mounting flange (403) abuts against the end surface of the engine support (2) and is fixed to the engine support (2) by mounting bolts passing through the two.

8. The signal transmission equipment isolation sealing structure according to claim 6, characterized in that: A plurality of embedded pipe joints (7) are embedded in each of the inner and outer walls of the installation plate (41), and the plurality of embedded pipe joints (7) on the inner wall are arranged in a one-to-one correspondence with the plurality of embedded pipe joints (7) on the outer wall, and are connected via a channel provided in the installation plate (41); the signal transmission equipment isolation sealing structure further comprises a plurality of bendable connecting pipes (8), the first ends of the plurality of connecting pipes (8) being connected in a one-to-one correspondence to the plurality of conveying pipes of the lead (3), and the second ends of the plurality of connecting pipes (8) being connected in a one-to-one correspondence to the plurality of embedded pipe joints (7) on the inner wall of the installation plate (41).

9. The signal transmission equipment isolation sealing structure according to claim 6, characterized in that: The mounting plate (41) is also processed with vertical channels (404) and transverse channels (405) which intersect each other vertically and are respectively arranged through the mounting plate; the air inlet end of the vertical channel (404) is connected to the inner shaft cavity (401) of the mounting plate of the induction device mounting plate (4), and the air outlet end of the vertical channel (404) is blocked by a plugging cover (9); the air inlet end of the transverse channel (405) is connected to the inner cavity (101) of the inlet cone (1), and the air outlet end of the transverse channel (405) is connected to an air inlet pipe (10) for exhaust, and the exhaust pipe extends outward after passing through the engine support (2).

10. A dynamic stress measuring device, characterized in that: A signal transmission device isolation and sealing structure as claimed in any one of claims 1 to 9.

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