Isolation and Sealing Structure of Signal Transmission Device and Dynamic Stress Measuring Device with the Same

Abstract

The present invention discloses an isolation and sealing structure for a signal transmission device and a dynamic stress measuring device having the same, including: an intake cone, an engine support, a current collector, a current collector mounting seat, and a sealed connection shaft group. The inner cavity of the engine support forms an engine lubricating oil cavity. The current collector mounting seat is located in the engine lubricating oil cavity and is sealingly connected to the engine support. The current collector is installed in the current collector mounting seat, and the front end extends into the inner shaft cavity of the current collector mounting seat. The sealed connection shaft group is located in the engine lubricating oil cavity. Its first end is fixedly connected to the engine rotor shaft of the engine, and its second end axially and sealingly penetrates the inner shaft cavity of the mounting seat to connect to the floating shaft of the current collector of the current collector, while sealing off the communication between the engine lubricating oil cavity and the inner shaft cavity of the mounting seat. The present invention can effectively prevent the front bearing of the current collector from overheating and causing it to malfunction, and there is no need to fill a cooling medium, and it will not cause engine oil leakage or air leakage due to the cooling air entering the 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 particularly to an isolation and sealing structure for a signal transmission device. In addition, the present invention also relates to a dynamic stress measurement device having the above-mentioned isolation and sealing structure for a signal transmission device. Background Art

[0002] Military specifications and civil aviation airworthiness regulations stipulate that in the development of aero-gas turbine engines, dynamic stress measurement tests of rotor blades need to be carried out to provide a basis for the evaluation of blade strength, life, and reliability. The signal transmission device is used to convert the vibration strain signal of the blade in the rotating state into a static electrical signal during the dynamic stress measurement process, and generally includes a slip ring and a telemetry system, which are essential equipment in the dynamic stress measurement test. In the dynamic stress measurement test of the blade, it often happens that the dynamic stress measurement test fails due to overheating during the working process caused by unreasonable installation of the signal transmission device or failure to take heat insulation protection measures for it. Therefore, the installation problem of the signal transmission device is an urgent "short board" in the dynamic stress measurement test of the blade.

[0003] Chinese Patent CN108844623B discloses a solution for dynamic stress measurement of high-pressure compressor rotor blades using a telemetry system as a signal transmission device. The cooling of the telemetry device is achieved through a nitrogen cooling mechanism, and the tube assembly is sealed by means of an end face, a rubber ring, a conical surface, and a plug-in method, and the front seal seat is sealed and designed to improve the cooling efficiency of nitrogen, providing guarantee for the stable and long-term operation of the telemetry device. However, liquid nitrogen is used for cooling in this patent, and this method is only applicable to component tests. If liquid nitrogen is passed through the whole machine, the engine is very likely to have temperature distortion and surge.

[0004] Chinese Patent CN113654701B discloses a sealing system for cooling a signal transmission device during the dynamic stress measurement of a rotor blade. The sealing system forms an inner cavity in the electrical connector mounting cavity through a sealing cover plate, an electrical connector (signal transmission device), and an electrical connector mounting seat. An adjustable gas source supplies gas to the inner cavity, and the controlled ventilation pressure is slightly greater than the pressure in the lubricating oil cavity, so that the oil and gas in the lubricating oil cavity will not enter the sealing cavity, achieving cooling of the electrical connector. A pressure sensor is installed on the bearing casing to monitor the pressure in the lubricating oil cavity. In this patent, it is required to inflate the cavity where the electrical connector is located for cooling, which requires the test bench to be equipped with an adjustable pressure device. It is required that the pressure in the cavity where the electrical connector is located is slightly higher than that in the lubricating oil cavity during inflation. In fact, the pressure in the lubricating oil cavity changes rapidly under different operating conditions (rotational speeds) of the engine. Therefore, the adjustable pressure device requires high pressure regulation accuracy and followability. The patent also requires pressure measurement points to be set in the lubricating oil cavity, and the test bench needs to be equipped with a pressure sensor and pressure measurement equipment. In addition, there is no seal between the oil baffle cover plate and the lead pipe, and it is required that the inner cavity pressure of the electrical connector is slightly higher than that of the lubricating oil cavity during inflation. The cooling gas with a certain pressure filled into the cavity of the electrical connector will overflow into the lubricating oil cavity, thereby increasing the pressure in the lubricating oil cavity, which may cause oil leakage and air leakage in the engine and affect its normal operation. Therefore, the use of this solution has the following two problems: First, it has high requirements for the test bench equipment and limited usage conditions. Second, there is no seal isolation between the electrical connector and the lubricating oil cavity, which will affect the pressure in the lubricating oil cavity and may cause oil leakage and air leakage in the engine.

[0005] Chinese Patent CN114295382B discloses an intake casing structure. The test line and the pipeline of the electrical connector itself are led out from the designed casing, and at the same time, gas is filled into the inner cavity where the electrical connector is located to cool the electrical connector. Similar to Patent CN113654701B, there is no seal isolation between the electrical connector and the engine. It is necessary to flush the cooling gas into the cavity of the electrical connector, and the flushed cooling gas will enter the lubricating oil cavity of the engine through the front end of the electrical connector, which may cause oil leakage and air leakage in the engine.

[0006] At the same time, in the existing solutions, the pipelines, test lines, etc. carried by the signal transmission device itself are all drilled on the intake cone (as shown in Figure 1 ), and led out from the front end of the engine. When the pipelines and test lines are led out radially, they will pass through the engine intake port. If there are many pipelines and test lines, the diameter after bundling is large, which may affect the axial intake of the engine.

[0007] Therefore, the existing isolation and cooling devices for signal transmission equipment have the following disadvantages:

[0008] 1) There are limitations in the use of the cooling medium: Liquid nitrogen cannot meet the requirements of the whole machine test, and the method of inflating has high requirements for the test bench and may cause oil leakage and air leakage in the engine;

[0009] 2) The front end of the current collector is located in the engine lubricating oil cavity. There is no sealed isolation between the current collector and the lubricating oil cavity, which will affect the pressure in the lubricating oil cavity during inflation and may cause engine oil leakage and air leakage.

[0010] 3) The test line and the pipeline carried by the current collector itself are both led out radially along the engine air inlet. If the diameter is large after bundling, it may affect the axial air intake of the engine. Summary of the Invention

[0011] The present invention provides an isolation and sealing structure for a signal transmission device and a dynamic stress measurement device having the same, so as to solve the technical problems existing in the existing device, such as having high requirements for vehicle-mounted equipment and possibly causing engine oil leakage and air leakage.

[0012] The technical solution adopted by the present invention is as follows:

[0013] An isolation and sealing structure for a signal transmission device includes: an air inlet cone and an engine support that are connected axially and are respectively hollow, a current collector for converting the vibration strain signal of the blade in the rotating state into a static electrical signal, a current collector mounting seat for mounting and supporting the current collector, and a sealed connection shaft group for connection and sealing; the inner cavity of the engine support forms an engine lubricating oil cavity, the current collector mounting seat is located in the engine lubricating oil cavity and is hermetically connected to the engine support to hermetically isolate the engine lubricating oil cavity from communicating with the inner cavity of the air inlet cone through the gap between the current collector mounting seat and the engine support; the current collector is axially installed in the inner shaft cavity of the mounting seat that is axially penetrated through the current collector mounting seat, and the front end of the current collector extends into the cavity of the air inlet cone; the sealed connection shaft group is located in the engine lubricating oil cavity, and the first end of the sealed connection shaft group is fixedly connected to the engine rotor shaft of the engine, and the second end of the sealed connection shaft group axially and hermetically penetrates the inner shaft cavity of the mounting seat to connect the floating shaft of the current collector, and at the same time hermetically isolates the communication between the engine lubricating oil cavity and the inner shaft cavity of the mounting seat.

[0014] Further, the sealed connection shaft group includes a sealing shaft for connection, 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 axially extends into the inner shaft cavity of the mounting seat and then connects the floating shaft of the current collector; the sealing ring and the axial retaining ring are axially installed on the inner circle of the current collector mounting seat in sequence, and are hermetically clamped between the outer circle surface of the sealing shaft and the inner circle surface of the inner shaft cavity of the mounting seat to hermetically isolate the communication between the engine lubricating oil cavity and the inner shaft cavity of the mounting seat.

[0015] Further, an inwardly concave and annular mounting ring groove is provided on the inner side wall of the inner shaft cavity at the first end of the current collector mounting seat, and the axial retaining ring is limit-mounted in the mounting ring groove; the inner wall surface of the inner shaft cavity at the first end of the current collector mounting seat also protrudes towards the center to form a limiting flange, the limiting flange is located inside the mounting ring groove, and the sealing ring is limited between the mounting flange and the axial retaining ring.

[0016] Further, the first end of the sealing shaft is press-fitted axially into the front journal of the engine rotor shaft; the second end of the sealing shaft is axially concave to form a receiving cavity, and the first end of the electrical connector floating shaft extends axially into the receiving cavity and is fixedly connected to the sealing shaft.

[0017] Further, the outer diameter of the first end of the sealing shaft is greater than that of its second end, and a plurality of axially penetrating ventilation grooves are provided on the first end of the sealing shaft, and the ventilation grooves are used to communicate the central tie rod in the engine rotor shaft with the engine lubricating oil cavity.

[0018] Further, the electrical connector mounting seat includes a mounting disc and a mounting cylinder that are axially connected and are in a disc shape and a cylindrical shape, respectively; the inner shaft cavity of the mounting seat axially penetrates the mounting disc and the mounting cylinder; the sealing ring and the axial retaining ring are both clamped in the inner shaft cavity of the mounting cylinder of the mounting seat; the end face of the mounting disc is axially concave and extends to form a mounting cavity for accommodating the electrical connector and for top-retaining and limiting the electrical connector, and the mounting disc is also detachably connected to the engine support.

[0019] Further, an annular mounting flange protrudes outward from the outer wall surface of the mounting disc, the side wall surface of the mounting flange abuts against the end face of the engine support, and is fixed to the engine support by mounting bolts passing through both of them.

[0020] Further, a plurality of embedded pipe joints are respectively embedded in the inner and outer side walls of the mounting disc, and the plurality of embedded pipe joints on the inner side wall are arranged in one-to-one correspondence with the plurality of embedded pipe joints on the outer side wall and are communicated through a channel opened in the mounting disc; the signal transmission device isolation and sealing structure further includes a plurality of bendable connecting pipes, the first ends of the plurality of connecting pipes are connected to the plurality of delivery pipes of the electrical connector in one-to-one correspondence, and the second ends of the plurality of connecting pipes are connected to the plurality of embedded pipe joints on the inner side wall of the mounting disc in one-to-one correspondence.

[0021] Further, a vertical channel and a horizontal channel that are vertically intersecting and respectively penetrate are also machined on the mounting disc; the intake end of the vertical channel communicates with the inner shaft cavity of the mounting seat of the electrical connector mounting seat, and the exhaust end of the vertical channel is blocked by a plug; the intake end of the horizontal channel communicates with the inner cavity of the intake cone of the intake cone, and the exhaust end of the horizontal channel is connected to an exhaust pipe for exhausting, and the exhaust pipe passes through the engine support and extends outward.

[0022] According to another aspect of the present invention, a dynamic stress measuring device is also provided, which has the signal transmission device isolation and sealing structure as described in any one of the above.

[0023] The present invention has the following beneficial effects:

[0024] The present invention designs an isolation and sealing structure for a signal transmission device. In this isolation and sealing structure, by making the electrical connector mounting seat be sealingly connected to the engine support, it is thus possible to prevent the engine lubricating oil cavity from communicating with the inner cavity of the intake cone through the gap between the electrical connector mounting seat and the engine support. At the same time, the second end of the sealing connection shaft group is axially and sealingly inserted through the inner shaft cavity of the mounting seat, thereby blocking the communication between the engine lubricating oil cavity and the inner shaft cavity of the electrical connector mounting seat within the mounting seat, that is, blocking the communication between the engine lubricating oil cavity and the inner cavity of the intake cone. Thus, the inner cavity of the intake cone is communicated with the inner shaft cavity of the mounting seat to form a sealed cavity isolated from the engine lubricating oil cavity, and the electrical connector is sealed in this sealed cavity, thereby effectively preventing the front bearing of the electrical connector from overheating and causing it to malfunction, solving the problem that the engine test is forced to be interrupted and fails due to the abnormal operation of the electrical connector caused by overheating; and it also does not need to be filled with liquid nitrogen, so it is applicable to the whole machine test and will not cause temperature distortion and surge in the engine. At the same time, it also does not need air bleeding for cooling or filling other cooling media, so it has no special requirements for the test bench, the test bench structure is simple, the cost is low, and it will not cause engine oil leakage or air leakage due to the cooling air entering the engine lubricating oil cavity; when the structure of the present invention is applied to the dynamic stress measurement test of the compressor rotor blades of a certain type of engine, it is confirmed that it can effectively isolate the engine lubricating oil cavity from the front end of the electrical connector. At the maximum engine speed, the temperature of the front bearing of the electrical connector is also within the normal range, the cooling and bearing lubrication systems of the electrical connector work normally, the engine body does not leak oil or air, the electrical connector works stably, and the output signal is normal. At the same time, after using this structure, the vibration strain data at the maximum engine speed (46,000 revolutions per minute) of the engine are actually measured, the electrical connector works normally, and the dynamic stress measurement test is successful. At the same time, this structure has high reliability, strong versatility, does not need to be filled with cooling media, and has no influence on the engine oil circuit and air circuit.

[0025] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The following will refer to the drawings to make a further detailed description of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0027] Figure 1 is a schematic structural diagram of an isolation and sealing device for an existing signal transmission device;

[0028] Figure 2 is a front view structural diagram of the electrical connector;

[0029] Figure 3 is a schematic diagram of the original engine structure at the installation position of the electrical connector;

[0030] Figure 4 is a schematic cross-sectional front view of the current collector mounting seat of the preferred embodiment of the present invention;

[0031] Figure 5 is a schematic front view of the signal transmission device isolation and sealing structure of the preferred embodiment of the present invention;

[0032] Figure 6 is Figure 5 a partial schematic diagram of the installation of the sealing ring and the axial retaining ring in

[0033] Figure 7 is Figure 5 a schematic cross-sectional front view of the sealing shaft in

[0034] Figure 8 is Figure 5 a schematic diagram of the sealing connection shaft group and the rotor connection in

[0035] Figure 9 is Figure 5 a schematic diagram of the embedded pipe joint on the current collector mounting seat in

[0036] Figure 10 is Figure 5 a schematic diagram of the current collector mounting seat structure viewed from the engine outlet to the inlet in

[0037] Figure 11 is Figure 5 a piping layout diagram of the engine inlet end viewed from the engine inlet to the outlet in

[0038] Figure 12 is Figure 5 a design plan diagram of the current collector oil and gas lubrication gas discharge in

[0039] Figure 13 is Figure 12 a partial enlarged schematic diagram of

[0040] Legend:

[0041] 1. Intake cone; 101. Inner cavity of the intake cone;

[0042] 2. Engine support; 201. Engine lubricating oil cavity;

[0043] 3. Current collector; 31. Floating shaft of the current collector;

[0044] 4. Current collector mounting seat; 401. Inner shaft cavity of the mounting seat; 402. Limiting flange; 403. Mounting flange; 404. Vertical channel; 405. Horizontal channel; 41. Mounting plate; 42. Mounting cylinder;

[0045] 5. Sealed connection shaft group; 51. Sealed shaft; 511. Accommodation cavity; 512. Ventilation groove; 52. Sealing ring; 53. Axial retaining ring;

[0046] 61. Engine rotor shaft; 62. Central tie rod;

[0047] 7. Embedded pipe joint; 8. Connecting pipe; 9. Plug cover; 10. Air supply pipe; 11. Installation bolt; 12. Oil chamber seal disc; 13. Support assembly; 14. Electrical lead pipe and test line interface. Detailed implementation mode

[0048] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0049] Refer to Figures 2 - 3 and Figure 5 , a preferred embodiment of the present invention provides an isolation and sealing structure for a signal transmission device, including: an air intake cone 1 and an engine support 2 that are axially connected and hollow respectively, an electrical lead 3 for converting the vibration strain signal of the blade in the rotating state into a static electrical signal, an electrical lead mounting seat 4 for mounting and supporting the electrical lead 3, and a sealed connection shaft group 5 that plays a connecting and sealing role. The inner cavity of the engine support 2 forms an engine oil chamber 201. The electrical lead mounting seat 4 is located in the engine oil chamber 201 and is hermetically connected to the engine support 2 to hermetically isolate the engine oil chamber 201 from communicating with the inner cavity 101 of the air intake cone 1 through the gap between the electrical lead mounting seat 4 and the engine support 2. The electrical lead 3 is axially installed in the inner shaft cavity 401 of the electrical lead mounting seat 4 that is axially penetrated, and the front end of the electrical lead 3 extends into the inner cavity 101 of the air intake cone 1. The sealed connection shaft group 5 is located in the engine oil chamber 201, and the first end of the sealed connection shaft group 5 is fixedly connected to the engine rotor shaft 61 of the engine. The second end of the sealed connection shaft group 5 axially and hermetically penetrates the inner shaft cavity 401 of the mounting seat to connect to the floating shaft 31 of the electrical lead 3 of the electrical lead 3, and at the same time hermetically isolates the communication between the engine oil chamber 201 and the inner shaft cavity 401 of the mounting seat.

[0050] During design, since the structure of the electrical lead is much more complex than that of the telemetry system, the telemetry system has no coolant and oil mist lubrication pipes, and the highest operating temperature of the telemetry system can reach 125 °C, while the electrical lead can only reach 85 °C. Therefore, the electrical lead is used for description in the signal transmission device of the present invention. The electrical lead 3 is used as a signal transmission device. As Figure 2 shown, the highest operating speed can reach 70,000 revolutions per minute. The internal core component is a brush ring and brush wire structure, which can convert the vibration strain signal of the rotor part into an electrical signal output. Its attached pipes include an inlet coolant pipe, a return coolant pipe (for cooling the brush ring and brush wire), and two oil mist lubrication pipes (for lubricating and cooling the front and rear bearings).

[0051] The present invention designs an isolation and sealing structure for a signal transmission device. In this isolation and sealing structure, by sealingly connecting the electrical connector mounting seat 4 with the engine support 2, it is thus possible to prevent the engine oil chamber 201 from communicating with the inner cavity 101 of the air intake cone 1 through the gap between the electrical connector mounting seat 4 and the engine support 2. At the same time, the second end of the sealing connection shaft group 5 is axially and sealingly penetrated through the inner shaft cavity 401 of the mounting seat, thereby cutting off the communication between the engine oil chamber 201 and the inner shaft cavity 401 of the electrical connector mounting seat 4, that is, cutting off the communication between the engine oil chamber 201 and the inner cavity 101 of the air intake cone 1. Thus, the inner cavity 101 of the air intake cone communicates with the inner shaft cavity 401 of the mounting seat to form a sealed cavity isolated from the engine oil chamber 201, and the electrical connector 3 is sealed in this sealed cavity, thereby effectively preventing the front bearing of the electrical connector from overheating and causing it to malfunction, and solving the problem that the engine fails due to the forced interruption of the test when the engine does not reach the specified speed due to the overheating of the electrical connector and its inability to work properly; moreover, it does not need to be filled with liquid nitrogen, so it is applicable to the whole machine test and will not cause temperature distortion and surge in 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 structure is simple and the cost is low, and it will not cause engine oil leakage or air leakage due to the entry of cooling air into the engine oil chamber; when the structure of the present invention is applied to the dynamic stress measurement test of the compressor rotor blades of a certain type of engine, it is confirmed that it can effectively isolate the engine oil chamber from the front end of the electrical connector. At the highest engine speed, the temperature of the front bearing of the electrical connector is also within the normal range, the cooling and bearing lubrication systems of the electrical connector work normally, the engine body does not leak oil or air, the electrical connector works stably, and the output signal is normal. At the same time, after using this structure, the vibration strain data at the highest engine speed (46,000 revolutions per minute) of the engine is measured. The electrical connector works normally, and the dynamic stress measurement test is successful. At the same time, this structure has high reliability, strong versatility, does not need to be filled with cooling media, and has no influence on the engine oil circuit and air circuit.

[0052] Optionally, as Figure 6As shown in the figure, the sealed connecting shaft group 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 axially extends into the inner shaft cavity 401 of the mounting seat and then connects to the electrical connector floating shaft 31. The sealing ring 52 and the axial retaining ring 53 are axially installed on the inner circle of the electrical connector mounting seat in sequence, and are hermetically clamped 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 hermetically isolate the communication between the engine lubricating oil cavity 201 and the inner shaft cavity 401 of the mounting seat. In this alternative solution, the sealing ring 52 is a lip seal. In this alternative solution, the sealing structure adopts a lip dynamic seal, and its installation position is set on the electrical connector mounting seat 4. One side of the lip seal is axially positioned by a designed elastic retaining ring. The design pressure of the lip seal needs to consider the pressures of the intake cone inner cavity 101, the inner shaft cavity 401 of the mounting seat, and the engine lubricating oil cavity 201. During operation, through the design of the installation position and structure of the lip seal, the purpose of isolating the intake cone inner cavity 101 and the inner shaft cavity 401 of the mounting seat from the engine lubricating oil cavity 201 is achieved. The lip seal contacts the sealing shaft 51 to achieve dynamic sealing, and one side of it is also axially positioned by the axial retaining ring 53.

[0053] In this alternative solution, as Figure 6 shown, an inwardly concave and annular mounting ring groove is provided on the inner side wall of the inner shaft cavity 401 at the first end of the electrical connector mounting seat 4, and the axial retaining ring 53 is limit-mounted in the mounting ring groove. The inner wall surface of the inner shaft cavity 401 at the first end of the electrical connector mounting seat 4 also protrudes towards the center to form a limit flange 402. The limit flange 402 is located inside the mounting ring groove, and the sealing ring 52 is limited between the limit flange 402 and the axial retaining ring 53.

[0054] In this alternative solution, as Figure 5 、 Figures 7 - 8 shown, the first end of the sealing shaft 51 is axially press-fitted into the front journal of the engine rotor shaft 61. The second end of the sealing shaft 51 is axially inwardly concave to form a receiving cavity 511, and the first end of the electrical connector floating shaft 31 axially extends into the receiving cavity 511 and is fixedly connected to the sealing shaft 51. In this alternative 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 electrical connector floating shaft 31, realizing the coupling and sealing functions at the same time. The sealing shaft 51 is in interference fit with the front journal of the engine for torque transmission and axial positioning, and at the same time forms a dynamic seal with the lip seal.

[0055] Preferably, as Figures 7 - 8As shown, the outer diameter of the first end of the sealed shaft 51 is greater than that of its second end. Multiple axially penetrating ventilation grooves 512 are provided on the first end of the sealed shaft 51. The ventilation grooves 512 are used to connect the central pull rod 62 inside the engine rotor shaft 61 with the engine lubricating oil chamber 201, thereby ensuring that the engine ventilation system meets the design requirements.

[0056] Optionally, as Figures 4 - 5 shown, the electrical collector mounting seat 4 includes a mounting disk 41 and a mounting cylinder 42 that are axially connected and are in a disk shape and a cylindrical shape respectively. The inner shaft cavity 401 in the mounting seat penetrates through the mounting disk 41 and the mounting cylinder 42 axially; both the sealing ring 52 and the axial retaining ring 53 are clamped in the inner shaft cavity 401 of the mounting cylinder 42 of the mounting seat; the end face of the mounting disk 41 is recessed and extended to form a mounting cavity for accommodating the electrical collector 3 and pressing and limiting the electrical collector 3, and the mounting disk 41 is also detachably connected to the engine support 2.

[0057] Furthermore, as Figure 4 shown, an annular mounting flange 403 is formed by outward protrusion on the outer wall surface of the mounting disk 41. The side wall surface of the mounting flange 403 abuts against the end face of the engine support 2 and is fixed to the engine support 2 by mounting bolts passing through both of them. In this optional solution, as Figure 3 shown, an electrical collector mounting seat 4 is designed. Using the original mounting bolts 11 of the engine support assembly, the electrical collector 3 is mounted on the engine support 2 through the mounting flange 403. At the same time, the original lubricating oil chamber sealing disk 12 is cancelled. A structure that can achieve the sealing function is also designed on the electrical collector mounting seat 4. At the same time, a sealed shaft 51 is designed to cooperate with the sealing structure on the electrical collector mounting seat 4 to achieve 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 electrical collector 3 and avoid overheating of the electrical collector 3 due to poor bearing heat dissipation and inability to work normally.

[0058] Optionally, as Figure 5 、 Figures 9 - 11As shown in the figure, a plurality of embedded pipe joints 7 are embedded in the inner and outer side walls of the mounting disc 41 respectively, and the plurality of embedded pipe joints 7 on the inner side wall are arranged in one-to-one correspondence with the plurality of embedded pipe joints 7 on the outer side wall, and are communicated through a channel opened in the mounting disc 41. The signal transmission device isolation and sealing structure further includes a plurality of bendable connecting pipes 8. The first ends of the plurality of connecting pipes 8 are connected to the plurality of delivery pipes of the electrical connector 3 in one-to-one correspondence, and the second ends of the plurality of connecting pipes 8 are connected to the plurality of embedded pipe joints 7 on the inner side wall of the mounting disc 41 in one-to-one correspondence. During the design, the test lines and pipelines of the electrical connector 3 cannot be led out by drilling holes in the intake cone 1. In the present invention, the inner support assembly 13, the electrical connector mounting seat 4, and the sealed connecting shaft group 5 in the intake cone 1 enclose the electrical connector 3 in a sealed cavity. When designing the electrical connector mounting seat 4, the lead-out interfaces for pipelines and test lines also need to be designed. Therefore, in the present invention, an embedded pipe joint 7 is arranged on the electrical connector mounting seat 4 and pipelines are designed to lead out multiple delivery pipes such as the coolant inlet pipe, coolant return pipe, and oil mist lubrication pipe on the electrical connector 3 from the sealed cavity. At the same time, since the space in the sealed cavity where the electrical connector 3 is located is narrow, 4 connecting pipes 8 with different shapes and bends, that is, metal pipes, are designed. One end of the metal pipe is connected to the joints of the coolant inlet pipe, coolant return pipe, and 2 oil mist lubrication pipes, and the other end is connected to the embedded pipe joint 7 embedded on the inner wall surface of the mounting disc 41. In this alternative solution, the design of the metal pipe avoids the problem that the pipelines are bent and knotted in a narrow space, causing blockage of the inlet and return coolant and oil mist lubrication gas and damaging the electrical connector. At the same time, the test lines and the connecting pipes 8 are led out from the casing at the position where the engine lubricating oil chamber 201 is located, avoiding affecting the engine intake conditions.

[0059] Optionally, as Figures 12 - 13 shown, a vertical channel 404 and a horizontal channel 405 that are vertically intersecting and penetrate through are also machined on the mounting disc 41. The intake end of the vertical channel 404 communicates with the inner shaft cavity 401 of the mounting seat of the electrical connector mounting seat 4, and the exhaust end of the vertical channel 404 is blocked by a plug 9. The intake end of the horizontal channel 405 communicates with the inner cavity 101 of the intake cone 1, and the exhaust end of the horizontal channel 405 is connected to an exhaust pipe 10 for exhaust, and the exhaust pipe passes through the engine support 2 and extends outwards. During the operation of the electrical connector, an oil-gas mixture with a pressure of (0.6 - 0.7) MPa needs to be introduced to lubricate the bearings of the electrical connector. After lubrication, the mixture enters the sealed inner cavity 101 of the intake cone and the inner shaft cavity 401 of the mounting seat. By designing the intersecting and communicating vertical channel 404 and horizontal channel 405 on the electrical connector mounting seat 4, the oil-gas mixture can be discharged into the atmosphere.

[0060] Optionally, a preferred embodiment of the present invention further provides a dynamic stress measurement device having an isolation and sealing structure for a signal transmission device as described in any one of the above. Thus, when using the dynamic stress measurement device of the present invention to measure the dynamic stress of a blade, it can effectively prevent the front bearing of the collector from overheating and causing it to malfunction, solve the problem that the engine test is forced to be interrupted and fail due to the collector overheating and malfunctioning before the engine reaches the specified speed. At the same time, there is no need to fill a cooling medium, it is applicable to the whole engine test, and it will not cause temperature distortion and surge in the engine, nor will it cause engine oil leakage or air leakage due to the cooling air entering the engine oil cavity. After using this device, vibration strain data at the maximum engine speed (46,000 revolutions per minute) are obtained through actual measurement, the collector works normally, and the dynamic stress measurement test is successful. At the same time, this structure has high reliability, strong versatility, does not require filling a cooling medium, and has no impact on the engine oil circuit and air circuit.

[0061] The foregoing 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 changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An isolation and sealing structure for a signal transmission device, characterized in that, include: An intake cone (1) and an engine support (2) connected in the axial direction and respectively arranged hollow, a galvanometer (3) for converting a vibration strain signal of a blade in a rotating state into a static electrical signal, a galvanometer mounting seat (4) for mounting and supporting the galvanometer (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 an 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 electric fuse floating shaft (31) of the electric fuse (3), and at the same time, the connection between the engine lubricating oil cavity (201) and the inner shaft cavity (401) of the mounting seat is sealed and isolated; 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 induced current generator. The sealing ring (52) and the axial retaining ring (53) are axially mounted on the inner circle of the induced current generator 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.

2. The signal transmission equipment isolation sealing structure according to claim 1, characterized in that: An inner side wall of the inner shaft cavity (401) of the first end of the lead-in device mounting seat (4) is provided with an inwardly concave and annular mounting ring groove, and an axial retaining ring (53) is limitedly mounted in the mounting ring groove; The inner wall surface of the inner shaft cavity (401) of the first end of the lead-in device mounting seat (4) also 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 limited between the limiting flange (402) and the axial retaining ring (53).

3. The signal transmission equipment isolation sealing structure according to claim 1, 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), and 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).

4. The isolation and sealing structure of the signal transmission device according to claim 3, characterized in that the outer diameter of the first end of the sealing shaft (51) is larger than that of the second end thereof, and a plurality of axially penetrating ventilation grooves (512) are further provided on the first end of the sealing shaft (51), and the ventilation grooves (512) are used to communicate the central tie rod (62) in the engine rotor shaft (61) with the engine lubricating oil chamber (201).

5. The isolation and sealing structure of the signal transmission device according to claim 1, characterized in that the electrical connector mounting seat (4) includes a mounting disc (41) and a mounting cylinder (42) which are axially connected and are in a disc shape and a cylindrical shape respectively, and the inner shaft cavity (401) of the mounting seat axially penetrates through the mounting disc (41) and the mounting cylinder (42); the sealing ring (52) and the axial retaining ring (53) are both clamped in the inner shaft cavity (401) of the mounting cylinder (42) of the mounting seat; the end face of the mounting disc (41) is concavely extended to form a mounting cavity for accommodating the electrical connector (3) and for top-retaining and limiting the electrical connector (3), and the mounting disc (41) is also detachably connected to the engine support (2).

6. The isolation and sealing structure of the signal transmission device according to claim 5, characterized in that the outer wall surface of the mounting disc (41) protrudes outward to form an annular mounting flange (403), the side wall surface of the mounting flange (403) abuts against the end face of the engine support (2), and is fixed to the engine support (2) by mounting bolts passing through the two.

7. The isolation and sealing structure of the signal transmission device according to claim 5, characterized in that a plurality of embedded pipe joints (7) are respectively embedded in the inner and outer side walls of the mounting disc (41), and the plurality of embedded pipe joints (7) on the inner side wall are arranged in one-to-one correspondence with the plurality of embedded pipe joints (7) on the outer side wall, and are communicated through a channel opened in the mounting disc (41); the isolation and sealing structure of the signal transmission device further includes a plurality of bendable connecting pipes (8), the first ends of the plurality of connecting pipes (8) are respectively connected to the plurality of conveying pipes of the electrical connector (3), and the second ends of the plurality of connecting pipes (8) are respectively connected to the plurality of embedded pipe joints (7) on the inner side wall of the mounting disc (41).

8. The isolation and sealing structure of the signal transmission device according to claim 5, characterized in that a vertical channel (404) and a transverse channel (405) which are vertically intersecting and respectively penetrate through are further processed on the mounting disc (41); the air inlet end of the vertical channel (404) communicates with the inner shaft cavity (401) of the electrical connector mounting seat (4), and the air exhaust end of the vertical channel (404) is blocked by a plug (9); the air inlet end of the transverse channel (405) communicates with the inner cavity (101) of the air inlet cone (1), and the air exhaust end of the transverse channel (405) is connected to an air exhaust pipe (10) for exhausting air, and the exhaust pipe penetrates through the engine support (2) and extends outwards.

9. A dynamic stress measurement device, characterized in that, There is an isolation and sealing structure of the signal transmission device as described in any one of claims 1-8.

Images