Chord wire drum type full-frequency vibration directional resonator type sensor

Abstract

The invention relates to the technical field of detection sensors, and particularly discloses a string wire drum type full-frequency vibration directional resonator type sensor, which comprises a resonator shell and an end cover, and is characterized in that a string wire sensing element is arranged in the resonator shell; the string wire sensing element comprises a string wire connecting plate and a string wire fixing frame, the string wire fixing frame is arranged in an opening in the other end of the resonance chamber shell, the string wire connecting plate is connected with the sensing element fixing rod, and a plurality of framework strings are evenly connected between the string wire connecting plate and the string wire fixing frame in the circumferential direction. Induction string wires are wound on all skeleton strings in the prismatic table-shaped string frame; according to the sensor, the resonance chamber shell serves as a resonance chamber, the sensing optical fiber is wound on the prismatic table-shaped string frame in a string wire mode, so that a string wire drum type structure is formed, the sensing optical fiber in the string wire drum type structure can receive signals through multiple times of reflection, the signals can be amplified in the resonance chamber, and the sensing optical fiber can be used for sensing the signals. Accurate acquisition of signals by the sensor is effectively ensured, and the detection precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of detection sensors, and specifically discloses a string-wire drum-type full-frequency vibration directional resonance box-type sensor. Background Art

[0002] There are a large number of moving equipment at petrochemical production sites. The operation of these equipment always has a certain degree of fatigue and wear, and has a certain service life. There is a risk of damage within a certain period. Therefore, timely detection of damaged moving equipment and repair are the keys to ensuring the continuous and safe production of petrochemical plants.

[0003] Traditionally, for the monitoring of on-site moving equipment, various sensors are usually arranged at corresponding positions of the moving equipment according to monitoring requirements. For example, a temperature sensor is set at the output shaft of a pump to detect the temperature of the bearing, and a noise sensor is installed near the pump to detect the operating noise of the pump. Such traditional monitoring means are not only complex, the cost of the system is very high, but also require specialized technical personnel for management.

[0004] Currently, there are also cases of using distributed optical fibers to monitor the operating status of equipment. For example, the invention application with the application number 202310212904.X discloses a method for monitoring the leakage of a constant-temperature pipeline based on distributed optical fiber sensing. The monitoring system includes a conveying pipeline, a heat-insulating accompanying pipeline, a sensing optical fiber, a heat-insulating device and a host. The heat-insulating accompanying pipeline is arranged in parallel with the conveying pipeline along the axial direction for insulating the conveying pipeline; the sensing optical fiber is in contact with the outer wall of the conveying pipeline and is connected to the host for detecting the temperature of the conveying pipeline and for sending the detected temperature of the conveying pipeline to the host; the heat-insulating device covers the conveying pipeline, the heat-insulating accompanying pipeline and the sensing optical fiber for insulating the conveying pipeline, the heat-insulating accompanying pipeline and the sensing optical fiber. This invention is a traditional distributed optical fiber temperature measurement system, which is simple and effective compared with the traditional method of setting sensors for detection. However, the detection method of distributed optical fiber sensing still has deficiencies. First, it needs to be installed in a contact manner with the object to be detected to achieve accurate temperature measurement; second, this distributed optical fiber can only measure the temperature of an object through contact action, and cannot be used to detect the vibration and noise generated by moving equipment, and cannot judge the comprehensive state of moving equipment; third, when the distributed optical fiber adopts a non-contact design, the signal collected by the sensing optical fiber is weak, resulting in inaccurate collection of information such as the temperature, vibration and noise of moving equipment, and a large error. Therefore, in view of the deficiencies of traditional monitoring means and distributed optical fiber detection means, the present application proposes a string-wire drum-type full-frequency vibration directional resonance box-type sensor, using the sensing optical fiber as a detection element, and adopting a string-wire drum-type structure design to amplify the source signal, so as to effectively monitor the equipment to be detected. Summary of the Invention

[0005] The object of the present invention is to provide a string-wire drum-type full-frequency vibration directional resonance box-type sensor to solve the technical problems and deficiencies existing in traditional monitoring means and distributed optical fiber detection means.

[0006] The present invention is realized through the following technical solutions: A string-wire drum-type full-frequency vibration directional resonance box-type sensor, including a resonance box housing, one end of the resonance box housing is provided with an end cover, an induction element fixing rod is arranged at the center of the end cover, and the inner end of the induction element fixing rod is connected with a string-wire induction element; The string-wire induction element includes a string-wire connecting plate and a string-wire fixing frame arranged in the resonance box housing, the string-wire fixing frame is arranged in the opening at the other end of the resonance box housing, the string-wire connecting plate is connected with the induction element fixing rod, and a plurality of skeleton strings are circumferentially and evenly connected between the string-wire connecting plate and the string-wire fixing frame to form a frustum-shaped string frame, and sensing optical fibers in a straightened state are wound around all the skeleton strings in the frustum-shaped string frame, and the sensing optical fibers are sensing optical fibers.

[0007] As a further setting of the above solution, three sensing optical fibers are provided, namely a temperature sensing optical fiber, a vibration sensing optical fiber and a sound wave sensing optical fiber.

[0008] As a further setting of the above solution, the three sensing optical fibers are respectively wound around different positions on the frustum-shaped string frame in a staggered manner or the three sensing optical fibers are wound around the frustum-shaped string frame side by side.

[0009] As a further setting of the above solution, the skeleton string is one of a rod body or a flexible wire rope.

[0010] As a further setting of the above solution, a tension adjusting nut is threadedly connected to the induction element fixing rod outside the end cover.

[0011] As a further setting of the above solution, a compensation groove for winding the leading end of the sensing optical fiber is arranged on the induction element fixing rod.

[0012] As a further setting of the above solution, the centers of the string-wire connecting plate and the string-wire fixing frame are both arranged on the central axis of the resonance box housing.

[0013] As a further setting of the above solution, a through hole for passing through the induction element fixing rod is opened at the center of the end cover, and optical fiber inlet and outlet holes are opened at other positions of the end cover.

[0014] As a further setting of the above solution, the resonance box housing and the end cover are both made of anti-magnetic materials.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The sensor disclosed in the present invention uses the resonance box housing as the resonance box, and arranges the sensing optical fiber in the form of a string around the frustum-shaped string frame, thus forming a string drum structure. During the process of using it in a non-contact detection device, the vibration and sound waves transmitted from the device will cause the resonance of the induced string and the frustum-shaped string frame in the resonance box, thereby amplifying the signal to varying degrees, making the signal clearer. And due to the design of the multi-faceted frustum-shaped string frame, various "signal waves" will generate reflections when encountering these facets, so that a signal wave will be reflected multiple times inside the string induction element to amplify the signal; at the same time, the temperature on the device to be detected will be amplified through the signal superposition of the multi-turn wound induction string, so as to effectively and accurately detect the noise, vibration and temperature of the moving device.

[0016] In the present invention, the signal collection area of the sensor can also be adjusted as needed by appropriately changing the size of the string induction element. At the same time, the power amplification can be adjusted by changing the number of turns or density of the induction string wound on the string induction element, so that it has a wider application range. In addition, by adjusting the cone angle α and the installation position of the sensor, the direction angle and coverage range of the signal collected by the string induction element can be changed, so as to change the monitoring orientation and focus.

[0017] The sensor in the present invention arranges the acquisition of three signals in one structure through the resonance box housing, improving the integration degree of signal acquisition, having a compact structure, and the layout of the built-in induction element can effectively protect the sensitivity and reliability of the element. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0019] Figure 1 It is a schematic internal planar structure diagram of the present invention; Figure 2 It is a schematic three-dimensional structure diagram of the resonance box housing and the end cover of the present invention; Figure 3 It is a schematic three-dimensional structure diagram of the string induction element of the present invention; Figure 4 It is a schematic top planar structure diagram of the string induction element of the present invention; Figure 5 It is a schematic planar structure diagram of one side of the string induction element of the present invention; Figure 6This is the schematic plan view of the induction element fixing rod in the present invention. Detailed implementation manners

[0020] In order to enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0021] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will refer to the attached Figures 1 - 6 drawings and describe this application in detail in conjunction with the embodiments. Embodiment 1

[0022] Embodiment 1 discloses a string wire drum type full-frequency vibration directional resonance box type sensor, which includes a resonance box housing 1 made of anti-magnetic material, and the overall shape of the resonance box housing 1 is a drum-shaped cylinder. An internal thread is provided on the inner wall at one end of the resonance box housing 1, and an end cover 2 also made of anti-magnetic material is provided at the other end. One end of the resonance box housing 1 is sealed through the end cover 2. At the same time, a through hole 201 is provided at the center of the end cover 2, and optical fiber inlet and outlet holes 202 are provided at other positions. An induction element fixing rod 3 passes through the through hole 201, and a tension adjusting nut 4 is connected by thread at the outer end of the induction element fixing rod 3 located in the through hole 201. The axial position of the induction element fixing rod 3 can be adjusted through the action of the tension adjusting nut 4.

[0023] A string wire induction element 5 is fixedly connected to the inner end of the induction element fixing rod 3. The string wire induction element 5 includes a string wire connecting plate 501, a string wire fixing frame 502, a skeleton string 503, and an induction string wire 504. Among them, the string wire fixing frame 502 is connected to the internal thread at the open end of the resonance box housing 1 through the external thread on the outer cylindrical surface, and the string wire connecting plate 501 is fixedly connected to the inner end of the induction element fixing rod 3. The centers of the string wire connecting plate 501 and the string wire fixing frame 502 are both located on the central axis of the resonance box housing 1.

[0024] There are multiple skeleton strings 503, and the specific number can be changed according to the monitoring frequency requirements. The string diameter of the skeleton string 503 can also be selected as needed, so that different vibration frequencies can be felt. Therefore, the skeleton string 503 in the first embodiment can be an elongated rod or a flexible wire rope. In the specific design, 12 skeleton strings 503 are provided in this figure, and both ends of the 12 skeleton strings 503 are circumferentially and evenly connected between the string wire connecting plate 501 and the string wire fixing frame 502. Then, the string wire connecting plate 501 is pulled backward by the induction element fixing rod 3, so that the 12 skeleton strings 503 are pulled to be straightened, thus forming a frustum-shaped string frame with a regular 12-sided shape in a trumpet shape, and the conical angle α of the whole frustum-shaped string frame is determined by the signal characteristics to be measured. In addition, the string wire fixing frame 502 in the first embodiment can also adopt a stepped structure to be stuck in the port of the resonance box housing 1, and then the whole frustum-shaped string frame is pulled backward by the induction element fixing rod 3 to a straightened state, so as to realize the fixation between the string wire fixing frame 502 and the resonance box housing 1.

[0025] The induction string wire 504 in the first embodiment is a sensing optical fiber, and there are three in total. One is the temperature sensing optical fiber 5041 for temperature measurement, one is the vibration sensing optical fiber 5042 for vibration measurement, and the last one is the acoustic wave sensing optical fiber 5043 for noise measurement. The three induction string wires 504 are all wound on the frustum-shaped string frame formed by all the skeleton strings 503 and have a certain tension to keep themselves straightened. Taking one-twelfth of it (see Figure 6 ) is a trapezoid, and in the middle is a "string cloth" composed of densely arranged induction string wires 504. And because the winding diameter of the induction string wire 504 changes with the conical position, the suspended length (the length of Ln) of the induction string wire 504 also changes uniformly. Therefore, the resonance frequency of the induction string wire 504 changes continuously and has a very large frequency bandwidth, which is beneficial to measuring various signal waves.

[0026] At the same time, the resonance cavity (i.e., the inner cavity of the resonance box housing 1) is divided into a front resonance box cavity 101 and a rear resonance box cavity 102 by the "string cloth" formed by the induction string wires 504 on 12 sides. When the "source signal" enters the sensor, a part of the source signal acts on the induction string wire 504 and is reflected, and another part of the source signal enters the rear resonance box cavity 102 through the gaps between the induction string wires 504. Then, the rear resonance box cavity 102 amplifies the incoming source signal to strengthen the signal acquisition of the induction string wire 504; the front resonance box cavity 101 reflects the incoming source signal and focuses it at the bottom to strengthen the signal source.

[0027] In addition, when the three sensing string wires 504 (i.e., the temperature sensing optical fiber 5041, the vibration sensing optical fiber 5042, and the acoustic wave sensing optical fiber 5043) are specifically wound, they can be respectively wound at different positions on the frustum-shaped string frame in a staggered manner, so as to form three independent sensing string wires 504 similar to tower springs; or the three sensing string wires 504 can be wound side by side to form three superposed sensing string wires 504 similar to tower springs.

[0028] Both ends of the three sensing string wires 504 pass through the round holes on the string wire connection plate 501, and then are led out of the resonance box housing 1 through the optical fiber inlet and outlet holes 202. Finally, the ends of the three sensing string wires 504 led out of the resonance box housing 1 are connected to the corresponding interfaces of an optoelectronic conversion decoder (not shown in the figure). The signals detected by the temperature sensing string 5041, the vibration sensing string 5042, and the acoustic wave sensing string 5043 can be processed through the optoelectronic conversion decoder. In order to further amplify the signal, a compensation groove 301 is also provided on the sensing element fixing rod 3 located in the rear cavity 102 of the resonance box. Before the sensing string wire 504 is led out of the resonance box housing 1, the sensing string wire 504 is first wound around the compensation groove 301, and then led out of the resonance box housing 1 through the optical fiber inlet and outlet holes 202, so as to further strengthen the signal collection and make up for the problem of insufficient arrangement of the sensing string wires 504 on the frustum-shaped string frame.

[0029] When the string wire drum type full-frequency vibration directional resonance box type sensor disclosed in this Embodiment 1 monitors on-site equipment in petrochemical industry (such as pumps), the sensor in Embodiment 1 is fixed by a vertical rod fixed near the equipment to be detected, and the open end of the sensor is arranged facing the on-site equipment.

[0030] When the on-site equipment is operating normally, the noise, vibration, and its own temperature generated by it will be in a relatively stable state or a state of normal change trend for a long time. At this time, the vibration and acoustic waves transmitted from the on-site equipment will cause the resonance of the sensing string wires 504, the skeleton string 503, and the sensing element fixing rod 3 in the resonance box, and the corresponding sensing string wires 504 will collect and amplify the signals to make the signals clearer. At the same time, the thermal shock generated by the temperature of the on-site equipment will also perform signal superposition by the multi-turn wound temperature sensing optical fiber 5041, so that the collected signals are amplified, so that the three important information of the temperature, noise, and vibration of the operating equipment can be accurately collected, and the relevant parameter data can be obtained after being processed by the optoelectronic conversion decoder.

[0031] Once abnormal conditions occur in on-site equipment, such as damage to the bearings of pumps, the noise, vibration, and temperature at the rotating part will increase. At this time, the stringed drum full-frequency vibration directional resonance box sensor can collect and amplify the above signals, and then, after being processed by the optoelectronic conversion decoder, it can quickly determine the corresponding faults of the equipment. Another example is when there is a flange leak. The equipment temperature rises and approaches the temperature of the internal petroleum liquid, but at this time, the noise and vibration do not change. At this time, the stringed drum full-frequency vibration directional resonance box sensor can collect and amplify the above signals, and then, after being processed by the optoelectronic conversion decoder, it can quickly determine the relevant faults of the equipment.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A string-wire drum-type full-frequency vibration directional resonance box-type sensor, characterized in that, It includes a resonance box housing, one end of the resonance box housing is provided with an end cover, an induction element fixing rod is arranged at the center of the end cover, and a string wire induction element is connected to the inner end of the induction element fixing rod; The string wire induction element includes a string wire connecting plate and a string wire fixing frame arranged in the resonance box housing. The string wire fixing frame is arranged in the opening at the other end of the resonance box housing. The string wire connecting plate is connected to the induction element fixing rod. A plurality of skeleton strings are circumferentially and evenly connected between the string wire connecting plate and the string wire fixing frame to form a frustum-shaped string frame. The sensing fiber is wound around all the skeleton strings in the frustum-shaped string frame, and the sensing fiber is a sensing optical fiber.

2. The string wire drum type full-frequency vibration directional resonance box type sensor according to claim 1, characterized in that, There are three sensing fibers, namely a temperature sensing optical fiber, a vibration sensing optical fiber, and a sound wave sensing optical fiber.

3. The string wire drum type full-frequency vibration directional resonance box type sensor according to claim 2, characterized in that, The three sensing fibers are respectively wound around different positions on the frustum-shaped string frame in a staggered manner or the three sensing fibers are wound around the frustum-shaped string frame side by side.

4. The string-wire drum-type full-frequency vibration directional resonance box-type sensor according to claim 1, wherein The skeleton string is one of a rod body or a flexible wire rope.

5. The string-wire drum-type full-frequency vibration directional resonance box-type sensor according to claim 1 or 4, characterized in that, A tension adjusting nut is threadedly connected to the induction element fixing rod outside the end cover.

6. The string-wire drum type full-frequency vibration directional resonance box type sensor according to claim 1, characterized in that The induction element fixing rod is provided with a compensation groove for winding the lead-out end of the sensing fiber.

7. The string-wire drum-type full-frequency vibration directional resonance box-type sensor according to claim 1, characterized in that, The centers of the string wire connecting plate and the string wire fixing frame are both arranged on the central axis of the resonance box housing.

8. The string-wire drum-type full-frequency vibration directional resonance box-type sensor according to claim 7, characterized in that A through hole for passing through the induction element fixing rod is opened at the center of the end cover, and optical fiber inlet and outlet holes are opened at other positions of the end cover.

9. The string-wire drum-type full-frequency vibration directional resonance box-type sensor according to claim 1, characterized in that, The resonance box housing and the end cover are both made of anti-magnetic materials.

Images