Sound wave vibration detection device
By designing an external heat insulation and internal optical fiber sound vibration detection device inside the furnace, and using sound pickup diaphragm and optical fiber for acoustic-optical-electric signal conversion, the signal interference of the acoustic wave detection device in high temperature and smoke environments in the prior art is solved. and the problem of low accuracy, efficient and accurate sound wave detection is achieved.
Patent Information
- Application Number
- CN202420616579.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-27
AI Technical Summary
The existing furnace temperature measurement and sound wave detection devices are difficult to obtain accurate sound wave signals in high temperature and severe smoke and dust environments, and are easily affected by internal sound interference and carbon particles, resulting in reduced measurement accuracy and possible damage.
A sound wave vibration detection device with external heat insulation and internal optical fiber is designed, using high-temperature resistant stainless steel materials and thermal insulation materials, using sound pickup diaphragm and optical fiber for acoustic-optical-electric signal conversion, through thermal insulation outer sheath sleeve and The flange is fixed to the inner wall of the furnace to prevent carbon particles from entering and improve anti-interference ability.
It realizes the direct and accurate acquisition of the sound signals inside the furnace in harsh environments, improves the anti-interference ability and measurement accuracy of the signal, avoids the influence of carbon particles, and improves the high temperature resistance of the detection device.
Smart Images
Figure CN222166303U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sound wave detection, in particular to a sound wave vibration detection device. Background Art
[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.
[0003] In recent years, the acoustic wave method, as an indirect method, can be used to measure the temperature inside industrial furnaces. Its principle is to use the relationship between the propagation speed of sound waves and the temperature of the medium. The higher the temperature, the faster the propagation speed of sound waves. Therefore, the time difference from the generation to the arrival of the sound wave can be detected to measure the medium temperature. Only when the sound signal collected inside the furnace is accurate enough can the temperature inside the furnace be accurately reflected.
[0004] However, since the temperature in an industrial furnace can be as high as 1500°C and the smoke and dust are very serious, ordinary sound sensors cannot be used in such harsh environments. The existing furnace temperature measurement and acoustic wave detection device (such as: CN 216524438U) is equipped with a soot blowing and dust removal mechanism. The acoustic wave detection module detects the sound waves emitted by the soot blower when blowing soot and directly converts the sound signal into an electrical signal to calculate the propagation time of the sound, thereby obtaining the temperature in the furnace. However, the above device ignores that a large amount of sound will also be generated inside the furnace, which will interfere with the sound of the soot blower to be collected by the acoustic wave probe; and directly converting the sound signal into an electrical signal cannot intuitively reflect the slight changes in the sound signal. At the same time, since the furnace contains burning carbon particles and the temperature is extremely high, it is easy to reduce the measurement accuracy of the acoustic wave probe in the absence of necessary sealing measures and heat insulation measures, resulting in the acquired acoustic wave signal being inaccurate, affecting the subsequent accurate measurement of the temperature, and even causing damage to the acoustic wave probe. Utility Model Content
[0005] In order to solve the problem of sound detection in harsh environments such as high temperature and dust, the utility model provides a sound wave vibration detection device with external heat insulation, internal optical fiber and a sound pickup diaphragm at the front end.
[0006] In order to achieve the above object, the present invention adopts the following technical solution:
[0007] An acoustic wave vibration detection device, comprising:
[0008] The heat-insulating outer protective sleeve is made of a high-temperature resistant stainless steel pipe and is hollow in the middle;
[0009] The detection tube is placed in the hollow middle part of the heat-insulating outer sleeve. A sound pickup diaphragm is fixed to the front end of the detection tube. The sound pickup diaphragm vibrates under the action of sound, causing the signal strength of the optical signal in the connected optical fiber to change.
[0010] A connecting optical fiber, which is located inside the detection tube and is used to transmit the optical signal and transmit the optical signal with changed signal strength to the photoelectric converter;
[0011] Optoelectronic converter converts the optical signal transmitted by the optical fiber into an electrical signal.
[0012] As a further technical solution, the interior of the thermal insulation outer sleeve is lined with a layer of high temperature resistant thermal insulation material.
[0013] As a further technical solution, the heat-insulating outer sleeve is provided with a flange, and the device is fixed to the inner wall of the furnace through the flange.
[0014] As a further technical solution, the detection tube is an ordinary stainless steel thin tube, and a rotating joint is provided at the rear end.
[0015] As a further technical solution, the connecting optical fiber includes a luminous optical fiber and a reflecting optical fiber.
[0016] As a further technical solution, the inner side of the sound pickup diaphragm is close to the light-emitting optical fiber and the reflective optical fiber, and a certain gap is left.
[0017] As a further technical solution, the front end of the light-emitting optical fiber is aligned with the sound pickup diaphragm, and the rear end is aligned with the light source.
[0018] As a further technical solution, the front end of the reflective optical fiber is aligned with the sound pickup diaphragm, and the rear end is aligned with the photoelectric converter.
[0019] As a further technical solution, the sound pickup diaphragm is a metal corrugated elastic film, which is embedded in the detection tube and is sealed inside and outside.
[0020] As a further technical solution, it also includes a light source, which is a light emitting diode.
[0021] Beneficial effects of one or more of the above technical solutions:
[0022] (1) The acoustic wave vibration detection device proposed by the utility model directly obtains the sound inside the furnace without interference from additional sounds. In the process of obtaining the sound signal, the sound signal inside the furnace is accurately reflected by the vibration of the pickup diaphragm. At the same time, the vibration of the pickup diaphragm will change the signal strength of the optical signal in the connected optical fiber. The photoelectric converter can capture the slight change in light intensity and convert it into a corresponding electrical signal, realizing the conversion of the signal from sound to light to electricity, solving the problem of a large amount of interference and inaccuracy in directly obtaining the sound wave signal, and improving the signal's anti-interference ability.
[0023] (2) The sound pickup diaphragm of the detection tube in the utility model is sealed inside and outside, which effectively prevents carbon particles inside the furnace from entering the device and affecting the detection accuracy of the device.
[0024] (3) The heat-insulating outer protective sleeve of the utility model is provided with a heat-insulating material, which can effectively improve the high-temperature resistance of the detection device, making it suitable for occasions with more severe environments. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.
[0026] Figure 1 It is a schematic diagram of the principle structure of the utility model.
[0027] Figure 2 It is the front view of the device of the utility model.
[0028] In the figure, 1 detection tube; 1-1 sound pickup diaphragm; 1-2 light emitting optical fiber; 1-3 reflection optical fiber; 1-4 light source; 1-5 photoelectric conversion module; 2 heat insulation outer sleeve; 2-1 insulation material; 3 flange; 4 rotary joint DETAILED DESCRIPTION
[0029] The following is combined with Figure 1-2 The specific implementation of this embodiment is described.
[0030] In this embodiment, refer to Figure 1 The sound generated inside the furnace acts on the sound pickup diaphragm 1-1 in the form of sound waves, causing the sound pickup diaphragm 1-1 to vibrate within a certain range with the size of the sound. At this time, the light emitted by the light source 1-4 is transmitted to the inner side of the sound pickup diaphragm 1-1 through the light-emitting optical fiber 1-2. Due to the vibration of the sound pickup diaphragm 1-1, the signal intensity of the optical signal transmitted by the light-emitting optical fiber 1-2 changes. The optical signal after the signal intensity change is transmitted through the reflecting optical fiber 1-3 to the photoelectric converter 1-5 located at the rear end of the reflecting optical fiber 1-3. The photoelectric converter 1-5 converts the above optical signal into an electrical signal. Due to the change in light intensity, the electrical signal in the photoelectric conversion module 1-5 also changes with the change in reflected light. Therefore, the sound signal inside the furnace is presented through the vibration of the sound pickup diaphragm by the above means, and the sound signal is converted into an optical signal by connecting the optical fiber, and the optical signal is further converted into an electrical signal by the photoelectric converter, so as to realize the accurate collection of sound wave vibration, and effectively avoid the problems of weak anti-interference ability and inaccuracy in the process of simply collecting sound signals.
[0031] Combination Figure 2 , taking the flue of a coal-fired boiler as an example, the specific implementation method of this embodiment is further explained.
[0032] The flue temperature of coal-fired boilers is generally around 800℃, the fly ash content is very high, and there are burning carbon particles. In such an environment, it is difficult for general acoustic wave detection devices to work properly. Therefore, the wave vibration detection device must be completely isolated from the outside world to prevent carbon particles from contacting the detection device itself and causing the detection device to fail. In addition, there must be sufficient heat insulation measures to ensure the accuracy of the acquired sound signal.
[0033] In this embodiment, an acoustic vibration detection device includes: a detection tube 1, a sound pickup diaphragm 1-1, a light-emitting optical fiber 1-2, a reflective optical fiber 1-3, a light source 1-4, a photoelectric converter 1-5; a heat-insulating outer sleeve 2, a flange 3; and a rotary joint 5. The heat-insulating outer sleeve 2 is made of a high-temperature resistant stainless steel pipe, and its interior is lined with a 4-cm thick heat-insulating material 2-1, which can effectively isolate the heat in the flue of a coal-fired boiler and prevent the high temperature from damaging the detection tube.
[0034] The middle of the heat-insulating outer sleeve is hollow, which can accommodate the detection tube 1 passing through it; the detection tube 1 is a complete stainless steel tube with a sound pickup diaphragm 1-1 at the front end and a rotary joint 5 at the rear end. The rotary joint 5 is used to connect with the electrical signal processing equipment and the light source power supply equipment. The detection tube 1 is placed in the hollow position in the middle of the heat-insulating outer sleeve 2 and can be pulled out of the heat-insulating outer sleeve 2. In addition, the outside of the heat-insulating outer sleeve 2 is also provided with a flange 4, and the detection device is fixed to the inner wall of the flue through the flange to ensure that the sound signal in the flue can be accurately collected.
[0035] The sound pickup diaphragm 1-1 is a metal corrugated elastic film, which is embedded in the front end of the detection tube 1. The inner and outer seals of the diaphragm are used to prevent smoke, gas, etc. in the furnace from entering the detection tube and affecting the detection accuracy.
[0036] The material of the detection tube 1 is an ordinary stainless steel thin tube, and the connecting optical fiber passes through the inside. There are two connecting optical fibers, namely the light-emitting optical fiber 1-2 and the reflective optical fiber 1-3. Among them, the front end of the light-emitting optical fiber 1-2 is aligned with the inside of the sound pickup diaphragm 1-1, and the rear end is aligned with the light source 1-4, and the light source 1-4 is a light-emitting diode; the front end of the reflective optical fiber 1-3 is aligned with the inside of the sound pickup diaphragm 1-1, and the rear end is aligned with the photoelectric converter 1-5. There is a certain gap between the light-emitting optical fiber 1-2 and the reflective optical fiber 1-3 and the sound pickup diaphragm 1-1, and the size of the gap is the maximum vibration range of the sound pickup diaphragm 1-1.
[0037] During the detection of sound wave vibration, the light source 1-4 inputs light into the light-emitting optical fiber 1-2, and the light is emitted to the inside of the sound pickup diaphragm 1-1 through the light-emitting optical fiber 1-2; due to the presence of a large amount of sound inside the furnace, the sound pickup diaphragm 1-1 will vibrate, which will cause the signal intensity of the optical signal transmitted in the light-emitting optical fiber 1-2 to change, and the light signal with changed signal intensity is transmitted to the photoelectric converter 1-5 along the reflection optical fiber 1-3, and the electrical signal generated by the photoelectric converter 1-5 will also change accordingly. Therefore, through the above process, the accurate collection of all sound signals in the flue is completed, and all sound signals are converted into optical signals, and then converted into electrical signals. The change in the signal intensity of the optical signal can accurately reflect the slight changes in the sound signal, thereby ensuring the accuracy of the collected sound signal and improving the anti-interference ability of the signal.
[0038] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.
Claims
1. An acoustic vibration detection device, characterized in that: include: The heat-insulating outer protective sleeve is made of a high-temperature resistant stainless steel pipe and is hollow in the middle; The detection tube is placed in the hollow middle part of the heat-insulating outer sleeve. A sound pickup diaphragm is fixed to the front end of the detection tube. The sound pickup diaphragm vibrates under the action of sound, causing the signal strength of the optical signal in the connected optical fiber to change. A connecting optical fiber, which is located inside the detection tube and is used to transmit the optical signal and transmit the optical signal with changed signal strength to the photoelectric converter; Optoelectronic converter converts the optical signal transmitted by the optical fiber into an electrical signal.
2. An acoustic vibration detection device as claimed in claim 1, characterized in that: The interior of the heat-insulating outer protective sleeve is lined with a layer of high-temperature resistant heat-insulating material.
3. The acoustic wave vibration detection device according to claim 1, characterized in that: The heat-insulating outer protective sleeve is provided with a flange, and the device is fixed on the inner wall of the furnace or the flue through the flange.
4. The acoustic wave vibration detection device according to claim 1, characterized in that: The detection tube is an ordinary stainless steel thin tube, and a rotating joint is arranged at the rear end.
5. The acoustic wave vibration detection device according to claim 1, characterized in that: The connecting optical fiber includes a light-emitting optical fiber and a reflecting optical fiber.
6. The acoustic wave vibration detection device according to claim 1, characterized in that: The inner side of the sound pickup diaphragm is close to the light-emitting optical fiber and the reflecting optical fiber, and a certain gap is left.
7. The acoustic wave vibration detection device according to claim 5, characterized in that: The front end of the light-emitting optical fiber is aligned with the sound pickup diaphragm, and the rear end is aligned with the light source.
8. The acoustic wave vibration detection device according to claim 5, characterized in that: The front end of the reflective optical fiber is aligned with the sound pickup diaphragm, and the rear end is aligned with the photoelectric conversion module.
9. The acoustic wave vibration detection device according to claim 1, characterized in that: The sound pickup diaphragm is a metal corrugated elastic film, which is embedded in the front end of the detection tube. The diaphragm is sealed inside and outside.
10. The acoustic wave vibration detection device according to claim 1, characterized in that: It also includes a light source, which is a light emitting diode.