High-temperature-resistant vibration sensor

Abstract

The invention relates to a high-temperature-resistant vibration sensor applied to the field of sensors, and the high-temperature-resistant vibration sensor comprises a fixed base which is installed on the surface of a to-be-detected device through bolts, a sensor assembly, a sealing assembly and a detection system. The installation coupling degree between the sensor assembly and the fixed base, the installation coupling degree between the fixed base and the heat shield and the installation coupling degree between the fixed base and the to-be-detected device are judged, coupling degree detection is carried out before the sensor works, and the glue sealing performance of the heat shield is detected before and during the work of the sensor through the glue sealing diagnosis module, so that the glue sealing integrity is judged. Glue sealing failure in a high-temperature vibration environment is avoided, so that the detection precision of the sensor assembly is ensured, the heat insulation ring piece is matched with the heat expansion block and the heat insulation block, even if glue sealing failure occurs in the working process of the heat insulation cover, coupling compensation can be made, and the detection precision is further enhanced.

Description

Technical Field

[0001] The present invention relates to a vibration sensor, in particular to a high-temperature resistant vibration sensor applied to the sensor field. Background Art

[0002] A vibration sensor is a device used to detect, measure, and record the vibration or mechanical movement of an object. They are widely used in industries, automobiles, aerospace, construction, etc., for monitoring equipment status, predicting faults, optimizing performance, etc.

[0003] The specification of Chinese Utility Model Patent CN219996335U discloses a high-temperature resistant piezoelectric vibration sensor. By sleeving a heat insulation cover outside the piezoelectric component, the temperature tolerance of the entire sensor is increased from 150°C to 260°C, solving the problem that the existing IEPE type vibration sensor cannot withstand high temperatures.

[0004] The specification of Chinese Utility Model Patent CN216593764U discloses a high-temperature resistant vibration sensor, which relates to the technical field of sensors. By setting a rock wool thermal insulation layer as a thermal insulation sheath to wrap outside the shell, the vibration sensor main body has good temperature resistance ability.

[0005] Existing vibration sensors use heat insulation sleeves to achieve the purpose of high-temperature resistance of the sensors. However, during the actual operation of the sensors, the heat insulation covers are usually adhesively connected. After the colloid is cured, cracks appear, which will also affect the accuracy of the sensing components inside the heat insulation cover. In addition, with the vibration operation, the mechanical coupling degree between the sensor and the installation equipment will be affected. If no corrective treatment is carried out before detection, the accuracy of the subsequent vibration detection results will be affected. Summary of the Invention

[0006] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is how to simply detect the adhesive performance and installation coupling degree during the operation of the vibration sensor, and be able to prevent the possible vibration caused by the reduction of the installation coupling degree of the heat insulation cover due to adhesive failure during the operation of the vibrator from interfering with the vibration sensor.

[0007] To solve the above problems, the present invention provides a high-temperature resistant vibration sensor, which includes a fixed base, a sensor component, a sealing component, and a detection system that are installed on the surface of the device to be detected through bolts. The sensor component is installed above the fixed base. The sealing component includes a heat insulation cover adhesively sealed on the top of the fixed base. A first pressure sensing film and a second pressure sensing film are respectively embedded and installed on the top and bottom of the fixed base. A third pressure sensing film corresponding to the heat insulation cover is embedded and installed on the top of the fixed base; The detection system includes a data acquisition module, a data analysis module, a coupling diagnosis module, and an adhesive sealing diagnosis module. Among them, the adhesive sealing diagnosis module is used to detect the adhesive sealing performance between the heat insulation cover and the fixed base; The glue-sealing diagnosis module includes a heat-insulating ring member fixedly installed on the inner wall of the heat-insulating cover. A thermal expansion block is inlaid on the surface of the heat-insulating ring member facing away from the sensor assembly, and a conductive block is installed on the surface of the thermal expansion block. A depression is provided at the top of the fixed base between the third pressure sensing film and the first pressure sensing film, and the depression is fitted and connected with the heat-insulating ring member. A strip-shaped groove with an internal conductive member is provided inside the fixed base. A warning light strip is installed on the top of the fixed base outside the heat-insulating cover, and the conductive member is electrically connected to the warning light strip.

[0008] In the above high-temperature vibration sensor, the coupling diagnosis module is used to judge the installation coupling degree, and the glue-sealing diagnosis module is used to detect the glue-sealing performance of the heat-insulating cover, so as to judge the glue-sealing integrity, avoid the glue-sealing failure under the high-temperature vibration environment, and ensure the detection accuracy of the sensor assembly.

[0009] As a further improvement of the present application, the coupling diagnosis module is signal-connected to the first pressure sensing film and the second pressure sensing film. The coupling diagnosis module further includes a judgment unit. The area of the third pressure sensing film is the pressing area, the area of the first pressure sensing film is the sensing area, and the area of the second pressure sensing film is the installation area.

[0010] As a further improvement of the present application, the working steps of the judgment unit are as follows: S1. Before the sensor assembly performs vibration detection, several induction points are randomly selected in the pressing area, the sensing area and the installation area respectively to form three sequence sets; S2. Use the formula U = 1 - SD(i) / AVE(i), where SD(i) is the standard deviation of the sequence and AVE(i) is the average value of the sequence. Among them, U1 represents the installation coupling degree between the sensor assembly and the fixed base, U2 represents the installation coupling degree between the fixed base and the device to be detected, and U3 represents the installation coupling degree between the heat-insulating cover and the fixed base; S3. When U1, U2 and U3 are all within the safe threshold range, the sensor assembly continues to perform vibration detection. If one or more of U1, U2 and U3 are outside the safe threshold range, repair treatment is carried out; S4. After the repair treatment, continue to repeat S1 - S3 until U1, U2 and U3 are all within the safe threshold range.

[0011] As a further improvement of the present application, the data acquisition module is used to collect the vibration data of the device to be detected, the data analysis module is used to analyze the vibration data collected by the data acquisition module, and the coupling diagnosis module is used to diagnose the installation coupling degree.

[0012] As a further improvement of the present application, the heat-insulating cover is bonded to the surface of the fixed base by heat-insulating glue, and when the heat-insulating ring member is inserted into the depression, the cross-sectional area of the thermal expansion block is smaller than the cross-sectional area of the strip-shaped groove.

[0013] As a further improvement of the present application, one side of the heat insulation ring member close to the sensor assembly is coated with a heat insulation coating, and the side of the heat insulation ring member facing away from the sensor assembly is a heat conduction layer.

[0014] As a further improvement of the present application, a phase change cooling layer and a temperature sensor are inlaid and installed on the top wall of the heat insulation cover, and the temperature sensor is used to assist in judging whether the heat insulation cover can normally insulate heat.

[0015] As another improvement of the present application, a through sliding groove is provided inside the heat insulation ring member, an insulating block is fitted and slidably connected inside the sliding groove, a fitting groove matching the insulating block is provided on the inner wall of the recess, one side surface of the insulating block is connected with a thermal expansion member, and a heat transfer member fixedly installed in the sliding groove is connected between the thermal expansion member and the thermal expansion block.

[0016] As another improvement of the present application, in the initial state, the insulating block is located in the sliding groove, and the depth value of the fitting groove is smaller than the width value of the insulating block.

[0017] In summary, the coupling diagnosis module is used to judge the installation coupling degrees between the sensor assembly and the fixed base, between the fixed base and the heat insulation cover, and between the fixed base and the device to be detected. The coupling degree is detected before the sensor works, and the sealing performance of the heat insulation cover is detected by the glue sealing diagnosis module before and during the operation of the sensor, so as to judge the glue sealing integrity, avoid the glue sealing failure in the high-temperature vibration environment, thereby ensuring the detection accuracy of the sensor assembly. The cooperation of the heat insulation ring member, the thermal expansion block and the insulating block enables the heat insulation cover to make a coupling compensation even if the glue sealing fails during the operation process, further strengthening the detection accuracy. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the sensor according to the first embodiment of the present application; Figure 2 It is an installation diagram of the fixed base and the second pressure sensing film according to the first embodiment of the present application; Figure 3 It is an internal structure diagram of the heat insulation cover according to the first embodiment of the present application; Figure 4 For the present application Figure 3 The enlarged view at A in; Figure 5 It is an installation diagram of the recess, the thermal expansion block and the conductive member according to the first embodiment of the present application; Figure 6 It is a working principle diagram of the warning light strip when the glue sealing fails according to the first embodiment of the present application; Figure 7 It is a structural diagram of the fitting groove and the insulating block according to the second embodiment of the present application; Figure 8 Composition diagram of the detection system according to the first embodiment of the present application; Figure 9 Working step diagram of the judgment unit according to the first embodiment of the present application.

[0019] Description of the reference numerals in the figure: 1. Sensor assembly; 2. Fixed base; 3. First pressure sensing film; 4. Second pressure sensing film; 5. Heat shield; 6. Heat insulation ring part; 7. Third pressure sensing film; 8. Warning light bar; 9. Depression; 10. Thermal expansion block; 11. Conductive part; 12. Fitting groove; 13. Heat insulation block. Specific implementation manner

[0020] The following will describe the two embodiments of the present application in detail with reference to the accompanying drawings.

[0021] The first embodiment: Figures 1 - 3 A high-temperature resistant vibration sensor is shown, including a fixed base 2, a sensor assembly 1, a sealing assembly and a detection system installed on the surface of the device to be detected through bolts. The sensor assembly 1 is installed above the fixed base 2. The sealing assembly includes a heat shield 5 sealed on the top of the fixed base 2 with glue. The first pressure sensing film 3 and the second pressure sensing film 4 are respectively fitted and installed on the top and bottom of the fixed base 2. The third pressure sensing film 7 corresponding to the heat shield 5 is fitted and installed on the top of the fixed base 2; Figure 8 It is shown that the detection system includes a data acquisition module, a data analysis module, a coupling diagnosis module and a glue sealing diagnosis module. Among them, the glue sealing diagnosis module is used to detect the glue sealing performance between the heat shield 5 and the fixed base 2; Figures 3 - 5 It is shown that the glue sealing diagnosis module includes a heat insulation ring part 6 fixedly installed on the inner wall of the heat shield 5. A thermal expansion block 10 is inlaid on the surface of the heat insulation ring part 6 facing away from the sensor assembly 1, and a conductive block is installed on the surface of the thermal expansion block 10. A depression 9 is provided on the top of the fixed base 2 between the third pressure sensing film 7 and the first pressure sensing film 3, and the depression 9 is fitted and connected with the heat insulation ring part 6. A strip-shaped groove with an internal conductive part 11 is provided inside the fixed base 2. A warning light bar 8 is installed on the top of the fixed base 2 outside the heat shield 5, and the conductive part 11 is electrically connected to the warning light bar 8.

[0022] Specifically, the first pressure sensing film 3 is used to detect the installation coupling degree between the sensor assembly 1 and the fixed base 2 (that is, to detect the installation stability between the sensor assembly 1 and the fixed base 2. If the installation is stable, the pressure of the sensor assembly 1 on the fixed base 2 is in a uniformly stressed state), the second pressure sensing film 4 is used to detect the installation coupling degree between the fixed base 2 and the device to be detected, and the third pressure sensing film 7 is used to detect the installation coupling degree between the heat shield 5 and the fixed base 2.

[0023] Although the heat shield 5 is not directly connected to the sensor assembly 1, the sensor assembly 1 and the fixed base 2, and the fixed base 2 and the device to be detected are in a stable installation state. If the heat shield 5 and the fixed base 2 are in an unstable installation state (for example, the colloid peels off and loosens at some adhesive joints, resulting in a decrease in the adhesive stability at that place), it will cause abnormal positions between the heat shield 5 and the fixed base 2 to possibly have delayed vibrations under the action of vibration (because the fixed base 2 and the device to be detected are in a stable installation state, the vibration consumes less when transmitted from the device to be detected to the fixed base 2, but will consume significantly when transmitted from the fixed base 2 to the heat shield 5. The loose connection may introduce non-linear effects, resulting in the vibration frequency of the heat shield 5 not being exactly the same as that of the device to be detected, and delayed vibrations occur), and the generated noise will affect the detection accuracy of the sensor assembly 1 (similarly, if the installation coupling degree of the detection sensor assembly 1 and the fixed base 2, and the installation coupling degree of the fixed base 2 and the device to be detected are abnormal, it will also affect the detection accuracy of the sensor assembly 1).

[0024] In addition, if there are cracks at the adhesive joints of the heat shield 5 but it does not affect the adhesive stability, the installation coupling degree of the heat shield 5 and the fixed base 2 will not be affected, but the external high-temperature heat will enter the heat shield 5 through the cracks, and the high temperature will also affect the detection accuracy of the sensor assembly 1. Therefore, attention needs to be paid to the stability of the performance of the adhesive joints of the heat shield 5.

[0025] When installing this sensor, first snap the heat shield 5 onto the surface of the third pressure sensing film 7. At this time, the heat insulation ring part 6 is snapped into the recess 9 to insulate the sensor assembly 1. Subsequently, use heat-insulating glue to bond the heat shield 5 to the fixed base 2, and then use bolts to bolt the fixed base 2 to the surface of the device to be detected.

[0026] The side of the heat insulation ring part 6 close to the sensor assembly 1 is coated with a heat insulation coating, and the side of the heat insulation ring part 6 facing away from the sensor assembly 1 is a heat conduction layer.

[0027] The heat shield 5 is bonded to the surface of the fixed base 2 with heat-insulating glue, and when the heat insulation ring part 6 is inserted into the recess 9, the cross-sectional area of the thermal expansion block 10 is smaller than the cross-sectional area of the strip-shaped groove.

[0028] When detecting the stability of the glue seal, if there are cracks, external heat (which can be the high-temperature heat during operation. If it is in a non-operating state, a heat source can be used, including but not limited to a heating block, etc.) is introduced into the heat-conducting layer of the heat-insulating ring part 6 through the cracks, and then transferred to the thermal expansion block 10 through the heat-conducting layer, causing the thermal expansion block 10 to thermally expand, driving the conductive block to contact the conductive part 11. After the circuit is connected, the warning light bar 8 lights up for warning. At the same time, the heat transferred to the heat-insulating ring part 6 will be intercepted by the heat-insulating coating-free layer, and thus will not affect the detection accuracy of the internal sensor assembly 1.

[0029] If there are no cracks, the heat will not be transferred into the heat-insulating cover 5, and thus will not be transferred to the heat-conducting layer. At this time, the thermal expansion block 10 remains separated from the conductive part 11, and the warning light bar 8 will not light up.

[0030] The coupling diagnosis module is signal-connected to the first pressure sensing film 3 and the second pressure sensing film 4. The coupling diagnosis module further includes a judgment unit. The area of the third pressure sensing film 7 is the pressing area, the area of the first pressure sensing film 3 is the sensing area, and the area of the second pressure sensing film 4 is the installation area.

[0031] Figure 9 It is shown that the working steps of the judgment unit are as follows: S1. Before the sensor assembly 1 performs vibration detection, randomly select a number of sensing points in the pressing area, the sensing area, and the installation area respectively to form three sequence sets; S2. Use the formula U = 1 - SD(i) / AVE(i), where SD(i) is the standard deviation of the sequence and AVE(i) is the average value of the sequence. Here, U1 represents the installation coupling degree between the sensor assembly 1 and the fixed base 2, U2 represents the installation coupling degree between the fixed base 2 and the device to be detected, and U3 represents the installation coupling degree between the heat-insulating cover 5 and the fixed base 2; S3. When U1, U2, and U3 are all within the safe threshold range, the sensor assembly 1 continues to perform vibration detection. If one or more of U1, U2, and U3 are outside the safe threshold range, repair treatment is carried out; S4. After the repair treatment, continue to repeat S1 - S3 until U1, U2, and U3 are all within the safe threshold range.

[0032] The data acquisition module is used to collect the vibration data of the device to be detected, the data analysis module is used to analyze the vibration data collected by the data acquisition module, and the coupling diagnosis module is used for the installation coupling degree.

[0033] Specifically, the vibration data is detected by the sensor component 1 and analyzed by the data analysis module. During this process, the installation coupling degrees between the sensor component 1 and the fixed base 2, between the fixed base 2 and the heat insulation cover 5, and between the fixed base 2 and the device to be detected are pre-detected by the judgment unit in the coupling diagnosis module to ensure the subsequent detection accuracy of the sensor.

[0034] The top wall of the heat insulation cover 5 is inlaid with a phase change cooling layer and a temperature sensor, and the temperature sensor is used to assist in judging whether the heat insulation cover 5 can normally insulate heat.

[0035] Specifically, the phase change cooling layer is made of a phase change material (paraffin or fatty acid in organic phase change materials can be used, selected according to specific situations), which is used to cool the heat generated when the sensor component 1 works in the heat insulation cover 5, and the temperature sensor is used to detect the internal temperature of the heat insulation cover 5. Since the sensor conducts detection work in a high-temperature environment and the heat generated when the sensor component 1 works in the heat insulation cover 5 is limited, when the heat insulation cover 5 itself has cracks, the temperature inside the heat insulation cover 5 will rise abnormally, playing a prompting role to replace the heat insulation cover 5 in time.

[0036] The second implementation method: Figure 7 It is shown that a through sliding groove is provided inside the heat insulation ring member 6, and a heat insulation block 13 is fitted and slidably connected inside the sliding groove. A fitting groove 12 matching the heat insulation block 13 is provided on the inner wall of the recess 9. One side surface of the heat insulation block 13 is connected with a thermal expansion member, and a heat transfer member fixedly installed in the sliding groove is connected between the thermal expansion member and the thermal expansion block 10.

[0037] In the initial state, the heat insulation block 13 is located inside the sliding groove, and the depth value of the fitting groove 12 is smaller than the width value of the heat insulation block 13.

[0038] Different from the first implementation method, in the first implementation method, when the installation coupling degree between the heat insulation cover 5 and the fixed base 2 appears abnormal due to peeling or loosening at the glued joint, the heat in the external high-temperature environment during the sensor operation will also prompt the glue-sealing diagnosis module to diagnose, and the warning light bar 8 will light up. In this state, the heat insulation ring member 6 can play the role of heat insulation, but the abnormal coupling degree during the operation will also affect the detection accuracy of the sensor component 1. Therefore, this implementation method is used for improvement.

[0039] Specifically, when peeling or loosening occurs at the bonding joint on the surface of the heat shield 5, the thermal expansion block 10 in the glue seal diagnosis module thermally expands and extends. At the same time, heat is transferred to the thermal expansion part through the heat transfer part, causing the thermal expansion part to thermally expand and push the heat insulation block 13 into the fitting groove 12, so that the heat shield 5 forms a connection lock in the sense of a biaxial axis with the fixed base 2 by using the heat insulation ring part 6 and the heat insulation block 13, strengthening the coupling stability, and thus ensuring the detection accuracy.

[0040] In addition, the depth value of the fitting groove 12 is less than the width value of the heat insulation block 13. This design enables a part of the heat insulation block 13 to still remain in the sliding groove after entering the fitting groove 12, preventing heat from being transferred into the fitting groove 12 and achieving heat insulation treatment.

[0041] In summary, this application uses the coupling diagnosis module to judge the installation coupling degrees among the sensor assembly 1, the fixed base 2, the fixed base 2 and the heat shield 5, and the fixed base 2 and the device to be detected. The coupling degree is detected before the sensor works, and the glue seal performance of the heat shield 5 is detected by the glue seal diagnosis module before and during the operation of the sensor, so as to judge the glue seal integrity and avoid glue seal failure in a high-temperature and vibration environment, thereby ensuring the detection accuracy of the sensor assembly 1. By using the cooperation of the heat insulation ring part 6, the thermal expansion block 10 and the heat insulation block 13, even if the glue seal fails during the operation of the heat shield 5, a coupling compensation can be made to further enhance the detection accuracy.

[0042] Combined with the current actual requirements, the above-mentioned implementation manner adopted in this application does not limit the protection scope thereto. Within the knowledge scope of those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A high-temperature resistant vibration sensor, comprising a fixed base (2) mounted on the surface of a device to be detected through bolts, a sensor assembly (1), a sealing assembly and a detection system, characterized in that: Above the fixed base (2), a sensor assembly (1) is installed. The sealing assembly includes a heat insulation cover (5) that is glued to the top of the fixed base (2). A first pressure sensing film (3) and a second pressure sensing film (4) are respectively fitted and installed on the top and bottom of the fixed base (2). A third pressure sensing film (7) corresponding to the heat insulation cover (5) is fitted and installed on the top of the fixed base (2). The detection system includes a data acquisition module, a data analysis module, a coupling diagnosis module, and a glue sealing diagnosis module. The glue sealing diagnosis module is used to detect the glue sealing performance between the heat insulation cover (5) and the fixed base (2). The glue sealing diagnosis module includes a heat insulation ring member (6) fixedly installed on the inner wall of the heat insulation cover (5). A thermal expansion block (10) is inlaid on the surface of the heat insulation ring member (6) facing away from the sensor assembly (1). A conductive block is installed on the surface of the thermal expansion block (10). A depression (9) is provided on the top of the fixed base (2) between the third pressure sensing film (7) and the first pressure sensing film (3). The depression (9) is fitted and connected with the heat insulation ring member (6). A strip groove with an internal conductive member (11) is provided inside the fixed base (2). A warning light strip (8) is installed on the top of the fixed base (2) outside the heat insulation cover (5). The conductive member (11) is electrically connected to the warning light strip (8).

2. The high-temperature resistant vibration sensor according to claim 1, characterized in that: The coupling diagnosis module is signal-connected to the first pressure sensing film (3) and the second pressure sensing film (4). The coupling diagnosis module further includes a judgment unit. The area of the third pressure sensing film (7) is the pressing area, the area of the first pressure sensing film (3) is the sensing area, and the area of the second pressure sensing film (4) is the installation area.

3. The high-temperature resistant vibration sensor according to claim 2, characterized in that: The working steps of the judgment unit are as follows: S1. Before the sensor assembly (1) performs vibration detection, randomly select a number of sensing points in the pressing area, sensing area, and installation area respectively to form three sequence sets. S2. Use the formula U = 1 - SD(i) / AVE(i), where SD(i) is the standard deviation of the sequence, and AVE(i) is the average value of the sequence. Here, U1 represents the installation coupling degree between the sensor assembly (1) and the fixed base (2), U2 represents the installation coupling degree between the fixed base (2) and the device to be detected, and U3 represents the installation coupling degree between the heat insulation cover (5) and the fixed base (2). S3. When U1, U2, and U3 are all within the safe threshold range, the sensor assembly (1) continues to perform vibration detection. If one or more of U1, U2, and U3 are outside the safe threshold range, repair treatment is carried out. S4. After the repair treatment, continue to repeat S1 - S3 until U1, U2, and U3 are all within the safe threshold range.

4. A high-temperature resistant vibration sensor according to claim 1, characterized in that: The data acquisition module is used to collect the vibration data of the device to be detected. The data analysis module is used to analyze the vibration data collected by the data acquisition module. The coupling diagnosis module is used to diagnose the installation coupling degree.

5. A high-temperature resistant vibration sensor according to claim 1, characterized in that: The heat shield (5) is bonded to the surface of the fixed base (2) by heat-insulating glue, and when the heat-insulating ring member (6) is inserted into the recess (9), the cross-sectional area of the thermal expansion block (10) is smaller than the cross-sectional area of the strip-shaped groove.

6. The high-temperature resistant vibration sensor according to claim 1, wherein: One side of the heat-insulating ring member (6) close to the sensor assembly (1) is coated with a heat-insulating coating, and the side of the heat-insulating ring member (6) facing away from the sensor assembly (1) is a heat-conducting layer.

7. A high-temperature resistant vibration sensor according to claim 1, characterized in that: A phase change cooling layer and a temperature sensor are embedded and installed on the top wall of the heat shield (5), and the temperature sensor is used to assist in judging whether the heat shield (5) can insulate heat normally.

8. A high-temperature resistant vibration sensor according to claim 1, characterized in that: A through sliding groove is provided inside the heat-insulating ring member (6), a heat-insulating block (13) is fitted and slidably connected inside the sliding groove, a fitting groove (12) matching the heat-insulating block (13) is provided on the inner wall of the recess (9), a thermal expansion member is connected to one side surface of the heat-insulating block (13), and a heat transfer member fixedly installed in the sliding groove is connected between the thermal expansion member and the thermal expansion block (10).

9. The high-temperature resistant vibration sensor according to claim 8, characterized in that: In the initial state, the heat-insulating block (13) is located in the sliding groove, and the depth value of the fitting groove (12) is smaller than the width value of the heat-insulating block (13).

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