Low temperature acoustic signal conducting isolation device

Abstract

The utility model discloses an anti-low temperature sound wave signal transmission isolation device belongs to sound wave signal transmission technical field, including temperature -insulated sheath casing, the inner wall upper surface fixed mounting of temperature -insulated sheath casing is installed with the mounting ring, the inner wall of mounting ring is inserted with ae sensor, the outer surface both sides of mounting ring are slidably installed with a plurality of lock position rod, and the same side a plurality of lock position rod end fixed mounting has same operation board, temperature -insulated sheath casing and temperature -insulated casing cover board cooperate ae sensor and waveguide rod use, and ae sensor is located in temperature -insulated sheath casing inside, and temperature -insulated sheath casing and temperature -insulated casing cover board effectively insulate low temperature, and utilize waveguide rod and ae sensor contact cooperation use, both avoid ae sensor and damage because of direct contact low temperature, and also pass through waveguide rod structure optimization and guarantee high -frequency signal integrity, break the restriction that traditional ae sensor cannot use under low temperature environment, provide reliable means for real -time damage monitoring under extreme environment.

Description

Technical Field

[0001] This utility model belongs to the field of acoustic signal transmission technology, specifically relating to a low-temperature acoustic signal transmission isolation device. Background Technology

[0002] Acoustic emission (AE) sensors are used in the transmission of acoustic signals. AE sensors are point-contact acoustic emission sensors suitable for monitoring metal cutting processes and for online automatic diagnostic testing of equipment. They employ short conical piezoelectric ceramic sensitive elements and acoustic impedance-matched backings, overcoming the weakness of traditional resonant AE accelerometers in achieving wide-bandwidth detection and reducing detection errors caused by factors such as aperture effects. They feature wide detection bandwidth, high sensitivity, simple structure, ease of manufacturing, and stable and reliable operation, and can be used as one-dimensional or multi-dimensional combined AE sensors.

[0003] However, when used directly, the AE sensor does not have good low-temperature resistance and is quite sensitive to ambient temperature. Therefore, it is prone to malfunction in low-temperature environments. To address this, we propose a low-temperature resistant acoustic signal transmission isolation device. Utility Model Content

[0004] The purpose of this invention is to provide a low-temperature resistant acoustic signal transmission isolation device to solve the problem mentioned in the background art that the AE sensor does not have good low-temperature resistance when used directly and is sensitive to ambient temperature, thus it is prone to not working properly in low-temperature environments.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a low-temperature acoustic wave signal transmission isolation device, comprising a thermal insulation sheath housing, an installation ring fixedly installed on the upper surface of the inner wall of the thermal insulation sheath housing, an AE sensor inserted into the inner wall of the installation ring, several locking rods slidably installed on both sides of the outer surface of the installation ring, and the same operating plate fixedly installed at the ends of the several locking rods on the same side, several locking grooves opened on the outer surface of the AE sensor, one end of the locking rod inserted into the inner wall of the corresponding locking groove, a conduit penetrating the outer surface of the thermal insulation sheath housing, an opening on the lower surface of the thermal insulation sheath housing, and a thermal insulation housing cover plate movably installed at the opening, an installation cylinder installed on the thermal insulation housing cover plate, a waveguide rod detachably installed inside the installation cylinder, the top end of the waveguide rod cooperating with the AE sensor, and the bottom end of the waveguide rod extending out of the installation cylinder.

[0006] The above scheme utilizes an insulated housing and cover plate in conjunction with an AE sensor and a waveguide rod. The AE sensor is located inside the insulated housing, which effectively isolates the low temperature. The waveguide rod contacts the AE sensor, allowing it to directly capture the signal when a low-temperature object, such as a superconducting magnet or a liquid hydrogen storage tank, releases high-frequency elastic wave acoustic emission signals due to stress or microcracks. This blocks the transmission of temperature to the AE sensor. The acoustic waves travel along the waveguide rod to the AE sensor, which has limited low-temperature resistance, and are then converted into an electrical signal output. This approach avoids damage to the AE sensor from direct contact with low temperatures and ensures the integrity of the high-frequency signal through optimized waveguide rod structure. It overcomes the limitation of traditional AE sensors being unusable in low-temperature environments, providing a reliable means for real-time damage monitoring in extreme environments. The installation collar and locking rod facilitate convenient installation of the AE sensor, while the fixing rod and fixing nut, along with the fixing collar, facilitate convenient installation of the waveguide rod, thus simplifying subsequent disassembly and assembly of the AE sensor and waveguide rod.

[0007] In the above scheme, it should be noted that the waveguide rod plays a crucial role in acoustic emission detection. It is mainly used to solve the signal transmission problem when the sensor installation is limited or the environment is harsh. The waveguide rod is used to isolate the low temperature and avoid the low temperature from affecting the normal use of the AE sensor.

[0008] In a preferred embodiment, a plurality of alignment plates are fixedly installed on the outer surface of the ae sensor, and a plurality of alignment slots are provided on the inner wall of the mounting collar, with the alignment plates inserted into the inner wall of the alignment slots.

[0009] By using the above solution, the alignment plate is inserted into the alignment slot for convenient alignment of the locking rod and the locking slot, making assembly and use easier.

[0010] In a preferred embodiment, a spring is sleeved on the outside of the locking rod, and the two ends of the spring are fixedly connected to the opposite surfaces of the mounting collar and the operating plate, respectively.

[0011] By adopting the above solution, a spring is set up. When the locking rod moves away from the locking groove, the spring deforms. Therefore, the elastic force of the spring can be used to drive the locking rod to quickly reset and lock into the locking groove, improving the convenience of locking operation.

[0012] In a preferred embodiment, a positioning pin is inserted into the operation panel, and two positioning grooves are opened on both the front and rear sides of the inner wall of the heat insulation sheath housing. The positioning pin is used in conjunction with the positioning groove.

[0013] By using the above solution, the positioning pin and positioning groove can be used together to lock the position of the control panel before and after sliding, thereby locking the position of the locking rod and preventing accidental movement from affecting use.

[0014] In a preferred embodiment, sealing rings are affixed to the upper surface of the thermal insulation shell cover and the inner wall of the conduit, and the sealing rings on the thermal insulation shell cover are fitted together with the lower surface of the thermal insulation sheath.

[0015] By adopting the above solution, the sealing ring on the conduit can ensure good sealing characteristics when the conduit is threaded through, and the sealing ring between the thermal insulation sheath and the thermal insulation cover plate can ensure good sealing characteristics between the two.

[0016] In a preferred embodiment, the surface of the heat-insulating shell cover plate has a protrusion and the surface of the protrusion has an external thread, the inner wall of the heat-insulating sheath shell has a recess and the recess has an internal thread, and the external thread and the internal thread are threadedly engaged.

[0017] By using the above solution, the combination of external and internal threads enables convenient assembly between the thermal insulation sheath and the thermal insulation cover plate, resulting in a tight threaded connection that is not easily loosened.

[0018] In a preferred embodiment, a plurality of fixing rods are fixedly installed on the upper surface of the mounting cylinder. The surface of the fixing rods is threaded and a fixing nut is threadedly installed. A fixing ring is fixedly installed on the outer surface of the waveguide rod. The fixing ring is fitted and arranged on the upper surface of the mounting cylinder. A plurality of through holes are opened on the fixing ring. The fixing rods pass through the through holes. The fixing nut is fitted and arranged on the upper surface of the fixing ring.

[0019] By using the above solution, the waveguide rod can be easily locked by passing through the fixing ring and then using the fixing nut. The locking stability is good and it is not easy for the waveguide rod to wobble.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This cryogenic acoustic signal transmission isolation device uses an insulated housing and cover plate in conjunction with an AE sensor and a waveguide rod. The AE sensor is located inside the insulated housing, which effectively isolates it from the low temperature. The waveguide rod contacts the AE sensor, allowing it to directly capture the signal when a cryogenic object, such as a superconducting magnet or a liquid hydrogen storage tank, releases high-frequency elastic wave acoustic emission signals due to stress or microcracks. The waveguide rod then transmits the sound waves along the waveguide rod to the AE sensor, whose cryogenic resistance is limited, and converts them into an electrical signal output. This design avoids damage to the AE sensor from direct contact with the low temperature and ensures the integrity of the high-frequency signal through optimized waveguide rod structure. It overcomes the limitation of traditional AE sensors being unusable in low-temperature environments, providing a reliable means for real-time damage monitoring in extreme environments.

[0022] This low-temperature acoustic signal transmission isolation device enables convenient installation of the AE sensor by using an installation collar in conjunction with a locking rod, and enables convenient installation of the waveguide rod by using a fixing rod and fixing nut in conjunction with a fixing collar, thus facilitating subsequent disassembly and assembly of the AE sensor and the waveguide rod. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 3 This is a schematic diagram of the exploded structure of the thermal insulation sheath and the thermal insulation sheath cover plate of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the mounting collar and the AE sensor exploded according to this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the mounting cylinder and waveguide rod of this utility model after an explosion.

[0028] In the diagram: 1. Thermal insulation sheath housing; 2. Mounting collar; 3. AE sensor; 4. Locking rod; 5. Operation panel; 6. Locking groove; 7. Conduit; 8. Thermal insulation housing cover plate; 9. Mounting cylinder; 10. Waveguide rod; 11. Alignment plate; 12. Alignment slot; 13. Spring; 14. Positioning pin; 15. Positioning groove; 16. Sealing ring; 17. Fixing rod; 18. Fixing ring; 19. Fixing nut. Detailed Implementation

[0029] Please see Figure 1-5This utility model provides a low-temperature acoustic wave signal transmission isolation device, including a thermal insulation sheath 1. An installation ring 2 is fixedly installed on the upper surface of the inner wall of the thermal insulation sheath 1. An AE sensor 3 is inserted into the inner wall of the installation ring 2. Several locking rods 4 are slidably installed on both sides of the outer surface of the installation ring 2. The ends of the several locking rods 4 on the same side are fixedly installed with the same operating plate 5. Several locking grooves 6 are opened on the outer surface of the AE sensor 3. One end of the locking rod 4 is inserted into the inner wall of the locking groove 6 at the corresponding position. A conduit 7 is installed through the outer surface of the thermal insulation sheath 1. The lower surface of the thermal insulation sheath 1 has an opening and a thermal insulation sheath cover 8 is movably installed at the opening. An installation cylinder 9 is installed on the thermal insulation sheath cover 8. A waveguide rod 10 is detachably installed in the installation cylinder 9. The top end of the waveguide rod 10 is used in conjunction with the AE sensor 3, and the bottom end of the waveguide rod 10 extends out of the installation cylinder 9.

[0030] The AE sensor 3 and waveguide rod 10 are used in conjunction with an insulated housing 1 and an insulated housing cover 8. The AE sensor 3 is located inside the insulated housing 1. The insulated housing 1 and the insulated housing cover 8 effectively isolate the low temperature. The waveguide rod 10 is used in contact with the AE sensor 3. When the measured low-temperature object, such as a superconducting magnet or a liquid hydrogen storage tank, releases a high-frequency elastic wave acoustic emission signal due to stress or microcracks, the waveguide rod 10 directly contacts the object surface to capture the signal and blocks the temperature from being transmitted to the AE sensor 3. The sound wave is conducted along the waveguide rod 10 to the AE sensor 3, which has limited low-temperature resistance, and then the AE sensor... The device 3 converts the signal into an electrical signal output, which not only avoids damage to the AE sensor 3 due to direct contact with low temperatures, but also ensures the integrity of the high-frequency signal through the optimized structure of the waveguide rod 10. This breaks through the limitation that the traditional AE sensor 3 cannot be used in low-temperature environments, and provides a reliable means for real-time damage monitoring in extreme environments. By setting the installation collar 2 in conjunction with the locking rod 4, the AE sensor 3 can be easily installed. By setting the fixing rod 17 and fixing nut 19 in conjunction with the fixing ring 18, the waveguide rod 10 can be easily installed, which facilitates the subsequent disassembly and assembly of the AE sensor 3 and the waveguide rod 10.

[0031] Several alignment plates 11 are fixedly installed on the outer surface of the AE sensor 3. Several alignment slots 12 are opened on the inner wall of the mounting collar 2. The alignment plates 11 are inserted into the inner wall of the alignment slots 12. By using the alignment plates 11 inserted into the alignment slots 12 for cooperation, the locking rod 4 and the locking groove 6 can be conveniently aligned, making it easy to assemble and use.

[0032] A spring 13 is sleeved on the outside of the locking rod 4. The two ends of the spring 13 are fixedly connected to the opposite surfaces of the mounting collar 2 and the operating plate 5, respectively. By setting the spring 13, the spring 13 deforms when the locking rod 4 moves away from the locking groove 6. Therefore, the elastic force of the spring 13 can be used to drive the locking rod 4 to quickly reset and lock into the locking groove 6, improving the convenience of locking operation.

[0033] The control panel 5 is equipped with a positioning pin 14. Two positioning grooves 15 are opened on the front and rear sides of the inner wall of the heat insulation sleeve housing 1. The positioning pin 14 and the positioning groove 15 are used together. By using the positioning pin 14 and the positioning groove 15 together, the position of the control panel 5 can be locked before and after sliding, thereby locking the position of the locking rod 4 to prevent accidental movement from affecting the use.

[0034] Sealing rings 16 are affixed to the upper surface of the thermal insulation shell cover plate 8 and the inner wall of the conduit 7. The sealing rings 16 on the thermal insulation shell cover plate 8 are attached to the lower surface of the thermal insulation sheath shell 1. The sealing rings 16 on the conduit 7 can ensure good sealing characteristics when the conduit 7 is threaded through. The sealing rings 16 between the thermal insulation sheath shell 1 and the thermal insulation shell cover plate 8 can ensure good sealing characteristics between the two.

[0035] The surface of the thermal insulation shell cover plate 8 has a protrusion and the surface of the protrusion has an external thread. The inner wall of the thermal insulation sheath shell 1 has a recess and the recess has an internal thread. The external thread and the internal thread are used in a threaded engagement. By using the external thread and the internal thread in a threaded engagement, the thermal insulation sheath shell 1 and the thermal insulation shell cover plate 8 can be easily assembled. The threaded connection is tight and not easy to loosen.

[0036] Several fixing rods 17 are fixedly installed on the upper surface of the mounting cylinder 9. The surface of the fixing rods 17 has threads and fixing nuts 19 are installed on the threads. A fixing ring 18 is fixedly installed on the outer surface of the waveguide rod 10. The fixing ring 18 is fitted and arranged on the upper surface of the mounting cylinder 9. Several through holes are opened on the fixing ring 18. The fixing rods 17 pass through the through holes. The fixing nuts 19 are fitted and arranged on the upper surface of the fixing ring 18. By using the fixing rods 17 to pass through the fixing ring 18 and cooperate with the fixing nuts 19, the waveguide rod 10 can be easily locked. The locking stability is good and it is not easy to shake.

[0037] In use, when the measured cryogenic object, such as a superconducting magnet or a liquid hydrogen storage tank, releases a high-frequency elastic wave acoustic emission signal due to stress or microcracks, the waveguide rod 10 directly contacts the object's surface to capture the signal and blocks the transmission of temperature to the AE sensor 3. The acoustic wave is conducted along the waveguide rod 10 to the AE sensor 3, which has limited cryogenic resistance, and then converted into an electrical signal output by the AE sensor 3. When it is necessary to disassemble the AE sensor 3 and the waveguide rod 10, the thermal insulation sheath 1 and the thermal insulation sheath cover 8 are rotated in opposite directions to separate them, and then pulled out. The positioning pin 14 on one side slides the operating plate 5 on one side to drive the locking rod 4 to move out of the locking groove 6. Then the positioning pin 14 passes through the operating plate 5 and is inserted into another positioning groove 15 to limit the position of the locking rod 4. Then the positioning pin 14 on the other side is pulled out, and the operating plate 5 on the other side is slid to drive the locking rod 4 to move out of the locking groove 6. Then the positioning pin 14 is used to limit the position of the locking rod 4. In this way, the AE sensor 3 can be unlocked and removed. Then the fixing nut 19 is turned and the fixing ring 18 is unlocked, and the waveguide rod 10 can be pulled up and taken out.

Claims

1. A low-temperature acoustic signal transmission isolation device, characterized in that: The device includes a thermal insulation sheath housing (1), on which an installation ring (2) is fixedly installed on the upper surface of the inner wall. An AE sensor (3) is inserted into the inner wall of the installation ring (2). Several locking rods (4) are slidably installed on both sides of the outer surface of the installation ring (2). The ends of the locking rods (4) on the same side are fixedly installed with the same operating plate (5). Several locking grooves (6) are opened on the outer surface of the AE sensor (3). One end of the locking rod (4) is inserted into the corresponding position. The inner wall of the locking groove (6) is provided with a conduit (7) through the outer surface of the heat insulation sheath (1). The lower surface of the heat insulation sheath (1) has an opening and a heat insulation sheath cover plate (8) is movably installed at the opening. An installation cylinder (9) is installed on the heat insulation sheath cover plate (8). A waveguide rod (10) is detachably installed inside the installation cylinder (9). The top end of the waveguide rod (10) is used in conjunction with the ae sensor (3). The bottom end of the waveguide rod (10) extends out of the installation cylinder (9).

2. The low-temperature acoustic signal transmission isolation device according to claim 1, characterized in that: The outer surface of the ae sensor (3) is fixedly equipped with several alignment plates (11), and the inner wall of the mounting collar (2) is provided with several alignment slots (12), and the alignment plates (11) are inserted into the inner wall of the alignment slots (12).

3. The low-temperature acoustic signal transmission isolation device according to claim 1, characterized in that: A spring (13) is sleeved on the outside of the locking rod (4), and the two ends of the spring (13) are fixedly connected to the opposite surfaces of the mounting collar (2) and the operating plate (5), respectively.

4. The low-temperature acoustic signal transmission isolation device according to claim 1, characterized in that: The operation panel (5) is provided with a positioning pin (14), and two positioning grooves (15) are opened on the front and rear sides of the inner wall of the heat insulation sleeve (1). The positioning pin (14) and the positioning groove (15) are used in conjunction.

5. The low-temperature acoustic signal transmission isolation device according to claim 1, characterized in that: Sealing rings (16) are attached to the upper surface of the heat insulation shell cover plate (8) and the inner wall of the conduit (7). The sealing rings (16) on the heat insulation shell cover plate (8) are attached to the lower surface of the heat insulation sheath shell (1).

6. The low-temperature acoustic signal transmission isolation device according to claim 1, characterized in that: The surface of the heat insulation shell cover plate (8) has a protrusion and the surface of the protrusion has an external thread. The inner wall of the heat insulation sheath shell (1) has a recess and the recess has an internal thread. The external thread and the internal thread are used in a threaded engagement.

7. The low-temperature acoustic signal transmission isolation device according to claim 1, characterized in that: A number of fixing rods (17) are fixedly installed on the upper surface of the mounting cylinder (9). The surface of the fixing rod (17) has threads and a fixing nut (19) is installed on the threads. A fixing ring (18) is fixedly installed on the outer surface of the waveguide rod (10). The fixing ring (18) is fitted and arranged on the upper surface of the mounting cylinder (9). A number of through holes are opened on the fixing ring (18). The fixing rods (17) pass through the through holes. The fixing nut (19) is fitted and arranged on the upper surface of the fixing ring (18).

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