High-temperature corrosion-resistant waveguide rod structure

Abstract

The utility model provides a high-temperature corrosion-resistant waveguide rod structure. The high-temperature corrosion-resistant waveguide rod structure comprises a waveguide rod, a sensor mounting flange and a connecting base, the sensor mounting flange is fixed at the outer end of the waveguide rod and is used for mounting an acoustic emission sensor; the connecting base is arranged at the inner end of the waveguide rod and is used for connecting a detection object; the connecting base comprises an alloy arc cover body, a first high-temperature-resistant sealing ring, a second high-temperature-resistant sealing ring, a vacuumizing one-way valve and a vacuum pump, a mounting hole is formed in the center of the top of the alloy arc cover body, and the inner end of the waveguide rod is arranged in the mounting hole in a penetrating mode through the first high-temperature-resistant sealing ring and achieves extrusion sealing; the alloy arc cover body is of a hopper-shaped structure with the bottom end enlarged, and the second high-temperature-resistant sealing ring is arranged on the lower edge of the alloy arc cover body. A suction hole is formed in the alloy arc cover body, the vacuumizing one-way valve is installed on the alloy arc cover body, and the vacuum pump is connected with the vacuumizing one-way valve through a pipeline. The high-temperature corrosion-resistant waveguide rod structure has the advantages of high temperature resistance and corrosion resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of waveguide rods, and specifically, to a waveguide rod structure with high temperature resistance and corrosion resistance. Background Art

[0002] A waveguide rod is an important structural component used in acoustic emission detection work.

[0003] Acoustic emission technology refers to a detection technology that detects elastic waves generated by the release of energy during the fracture of a target object, receives and analyzes the waveforms, and then judges the structural state of the target object.

[0004] Theoretically speaking, due to the attenuation problem in the wave transmission process, the closer the acoustic emission sensor is to the detection target, the higher the detection accuracy. However, in actual working conditions, the installation position of the acoustic emission sensor is often at a certain distance from the detection object. Especially in a high-temperature environment, being too close will affect the normal operation of the acoustic emission sensor itself. Therefore, in occasions where there is a distance requirement, a waveguide rod is usually needed to transmit these elastic waves and stress waves.

[0005] Generally, the inner end of the waveguide rod needs to be in contact with the detection target, and the outer end is connected to the acoustic emission sensor to complete the transmission process. However, in a high-temperature environment, the interference of the high-temperature environment also needs to be considered.

[0006] Specifically, the connection methods between the waveguide rod and the detection target generally include mechanical fixation, adhesive fixation, or magnetic attraction fixation, etc. Among them, adhesive fixation and magnetic attraction fixation will fail in a high-temperature environment, resulting in serious limitations in the installation form of the waveguide rod.

[0007] In addition, most high-temperature environments also have corrosion problems. The material of the waveguide rod is usually steel, and its corrosion will lead to performance loss.

[0008] To solve the problems of high-temperature installation and fixation and corrosion resistance, it is necessary to optimize and transform the waveguide rod structure.

[0009] To solve the above existing problems, people have been seeking an ideal technical solution. Content of the Utility Model

[0010] The purpose of the utility model is to overcome the deficiencies of the prior art, and thus provide a waveguide rod structure with high temperature resistance and corrosion resistance.

[0011] To achieve the above purpose, the technical solution adopted by the utility model is: a waveguide rod structure with high temperature resistance and corrosion resistance, including a waveguide rod, a sensor mounting flange, and a connection base;

[0012] The sensor mounting flange is fixed to the outer end of the waveguide rod for mounting an acoustic emission sensor;

[0013] The connection base is arranged at the inner end of the waveguide rod and is used to connect the detection object;

[0014] The connection base includes an alloy arc cover, a first high-temperature resistant sealing ring, a second high-temperature resistant sealing ring, a vacuum suction check valve and a vacuum pump. An installation hole is opened at the center of the top of the alloy arc cover. The inner end of the waveguide rod passes through the installation hole through the first high-temperature resistant sealing ring and realizes extrusion sealing; the alloy arc cover has a funnel-shaped structure with an enlarged bottom end, and the second high-temperature resistant sealing ring is arranged at the lower edge of the alloy arc cover; a suction hole is opened on the alloy arc cover and the vacuum suction check valve is installed, and the vacuum pump is connected to the vacuum suction check valve through a pipeline.

[0015] Based on the above, a negative pressure sensor is installed at the suction hole, and the negative pressure sensor is associated with the vacuum pump for control to control the negative pressure state inside the alloy arc cover.

[0016] Based on the above, a plurality of magnetic suction terminals are fixed at the four peripheral edges of the alloy arc cover, and the bottom surface of the magnetic suction terminal is flush with the bottom surface of the second high-temperature resistant sealing ring after adsorption and compression deformation.

[0017] Based on the above, a high-temperature resistant rubber layer with a thickness < 1 mm is coated outside the magnetic suction terminal.

[0018] Based on the above, the alloy arc cover is composed of a plurality of arc ribs, an annular skeleton and a plurality of fan-shaped arc surfaces assembled. The plurality of ribs cooperate with the annular skeleton to form an umbrella-shaped skeleton, and the plurality of fan-shaped arc surfaces are assembled on the umbrella-shaped skeleton to form the arc cover.

[0019] Based on the above, the thickness of the arc surface ≤ 1.5 mm, so that under the set negative pressure state, the arc surface generates slight deformation.

[0020] Based on the above, the waveguide rod and the first high-temperature resistant sealing ring are connected by threads, and the first high-temperature resistant sealing ring is fixedly connected to the alloy arc cover.

[0021] Based on the above, the waveguide rod and the installation hole of the alloy arc cover are tightly fixed through the first high-temperature resistant sealing ring.

[0022] The utility model has substantial features and progress compared with the prior art. Specifically, based on the special working conditions of high-temperature environments, the utility model installs the waveguide rod by using an alloy arc cover. Among them, the alloy arc cover is adsorbed on the surface of the object to be measured by creating a negative pressure environment, and is sealed by a second high-temperature resistant sealing ring in between, solving the problems that magnetic attraction and bonding methods are prone to failure in high-temperature environments, and mechanical connection methods require an installation foundation for the contact surface or welding means cause damage to the contact surface, etc., and solving the installation problem of the waveguide rod at high temperatures. At the same time, since the detection end of the waveguide rod is entirely located inside the alloy arc cover and is isolated from the external environment, it is not easy to come into contact with other substances and is not easily oxidized or corroded.

[0023] Furthermore, since the high-temperature state of the object to be detected is not a continuous state, temperature changes will cause changes in the negative pressure environment. Therefore, a negative pressure sensor is added to jointly adjust the negative pressure state with the vacuum pump.

[0024] Furthermore, when the high temperature of the object to be detected is eliminated during the non-working state, magnetic adsorption terminals can be added to provide supplementary adsorption force to the object to be detected and improve the adsorption strength.

[0025] Furthermore, the alloy arc cover has a certain degree of deformability, and this deformation amount can be used to adaptively adjust the negative pressure state. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of the high-temperature and corrosion-resistant waveguide rod structure in Embodiment 1 of the utility model.

[0027] Figure 2 is a schematic structural diagram of the high-temperature and corrosion-resistant waveguide rod structure in Embodiment 2 of the utility model.

[0028] Figure 3 is a schematic structural diagram of the high-temperature and corrosion-resistant waveguide rod structure in Embodiment 3 of the utility model.

[0029] Figure 4 is a schematic structural diagram of the high-temperature and corrosion-resistant waveguide rod structure in Embodiment 4 of the utility model.

[0030] In the figure: 1. Waveguide rod; 2. Sensor installation flange; 3. Connection base;

[0031] 31. Alloy arc cover; 32. First high-temperature resistant sealing ring; 33. Second high-temperature resistant sealing ring; 34. Vacuum pumping check valve; 35. Vacuum pump; 36. Installation hole; 37. Negative pressure sensor; 38. Controller; 39. Magnetic adsorption terminal;

[0032] 311. Arc rib; 312. Ring-shaped skeleton; 313. Arc surface. Detailed Implementation Modes

[0033] The technical solution of the present utility model will be further described in detail through specific embodiments below. Embodiment 1

[0034] As Figure 1 shown, a waveguide rod structure with high-temperature corrosion resistance includes a waveguide rod 1, a sensor mounting flange 2, and a connection base 3.

[0035] The sensor mounting flange 2 is fixed to the outer end of the waveguide rod 1 and is used to mount an acoustic emission sensor, usually located at a certain distance from the object to be detected to prevent high-temperature interference.

[0036] The connection base 3 is arranged at the inner end of the waveguide rod 1 and is used to connect the detection object. In this embodiment, the surface of the detection object is a plane.

[0037] The connection base 3 includes an alloy arc cover 31, a first high-temperature resistant sealing ring 32, a second high-temperature resistant sealing ring 33, a vacuum check valve 34, and a vacuum pump 35. An installation hole 36 is opened at the center of the top of the alloy arc cover 31. The inner end of the waveguide rod 1 passes through the installation hole 36 through the first high-temperature resistant sealing ring 32 and realizes extrusion sealing. Specifically, there are two connection methods. One is to design the first high-temperature resistant sealing ring 32 as an internal thread structure, and the waveguide rod 1 has a matching external thread. The first high-temperature resistant sealing ring 32 is fixed to the alloy arc cover 31, and the waveguide rod 1 is fixed and its position is adjusted by means of threaded connection, so as to achieve an excellent sealing effect. The second connection method depends on the deformation ability and size design of the first high-temperature resistant sealing ring 32, and the waveguide rod 1 is fixed by means of extrusion and pressing, which can make the structure of the waveguide rod 1 more concise, but the requirements of the sealing performance need to be considered.

[0038] The alloy arc cover 31 has a funnel-shaped structure with a widened bottom end. The second high-temperature resistant sealing ring 33 is arranged at the lower edge of the alloy arc cover 31. A suction hole is opened on the alloy arc cover 31 and the vacuum check valve 34 is installed. The vacuum pump 35 is connected to the vacuum check valve 34 through a pipeline. Generally, the vacuum pump 35 is installed at a position far from the object to be detected, and can also be coated by certain heat insulation means, but the air flow channel cannot be blocked.

[0039] Working principle description:

[0040] Since the bonding and magnetic adsorption methods are prone to failure in high-temperature environments, and due to the physical form limitations of the surface of the object to be detected, some mechanical connection methods are not easy to use. For example, in this embodiment, the object to be detected is a plane, and fixing methods such as hoop and caliper cannot be used, and only welding fixation can be used for fixation. However, there are performance requirements for the surface of the object to be detected, and generally, connection by means such as welding is not allowed to avoid damaging the surface structure.

[0041] Based on these situations, the problem can be effectively solved by using the negative pressure adsorption method.

[0042] During installation, it is usually operated at a low temperature state. The waveguide rod 1 is adsorbed in place in cooperation with the alloy arc cover 31. However, due to the influence of high-temperature expansion, it is necessary to continuously control the vacuum pump to evacuate the air again during the heating process to ensure that the negative pressure state meets the standard. At the same time, it is necessary to observe whether the sealing performance of the sealing ring is in place to avoid air leakage.

[0043] After completing these installation works, an acoustic emission sensor can be externally connected for detection. Embodiment 2

[0044] As Figure 2 shown, the main difference between this embodiment and Embodiment 1 is that a negative pressure sensor 37 is installed at the suction hole, and the negative pressure sensor 37 is associated and controlled with the vacuum pump 35 through a controller 38 to control the negative pressure state inside the alloy arc cover.

[0045] By using the negative pressure sensor to monitor the internal negative pressure environment in real time to avoid slight leakage, and by timely starting the vacuum pump to control the negative pressure state, the self-stability of adsorption can be continuously achieved. Embodiment 3

[0046] As Figure 3 shown, a plurality of magnetic adsorption terminals 39 are fixed at the four peripheral edges of the alloy arc cover 3, and the bottom surface of the magnetic adsorption terminal 39 is flush with the bottom surface of the second high-temperature resistant sealing ring after being adsorbed and compressed and deformed.

[0047] The purpose is to reduce the negative pressure requirement of the alloy arc cover in a low-temperature environment, use the magnetic adsorption method to replace or supplement the adsorption force, and extend the service life.

[0048] To protect the magnetic adsorption terminal from being corroded, a high-temperature resistant rubber layer with a thickness < 1 mm is coated on the magnetic adsorption terminal. Embodiment 4

[0049] As Figure 4 shown, the main difference between this embodiment and Embodiment 1 is that the alloy arc cover 31 includes a plurality of arc ribs 311, an annular skeleton 312 and a plurality of fan-shaped arc surfaces 313 assembled together. The plurality of ribs 311 cooperate with the annular skeleton 312 to form an umbrella-shaped skeleton, and the plurality of fan-shaped arc surfaces 313 are assembled on the umbrella-shaped skeleton to form the arc cover.

[0050] This makes the manufacturing of the alloy arc cover easier.

[0051] In a preferred embodiment, the thickness of the arc surface ≤ 1.5 mm, so that under the set negative pressure state, the arc surface generates slight deformation.

[0052] Its purpose is to enable the negative pressure environment to have an adaptive adjustment ability to a certain extent and avoid structural damage. The principle is that when the negative pressure changes slightly, first, the elastic restoring force of the arc surface will take effect. After the reset action is completed, the negative pressure can be finely adjusted and always maintained within a stable range.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or make equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A high temperature and corrosion resistant waveguide rod structure, characterized in that: It includes a waveguide rod, a sensor mounting flange and a connecting base; The sensor mounting flange is fixed to the outer end of the waveguide rod and is used to mount the acoustic emission sensor; The connection base is arranged at the inner end of the waveguide rod and is used for connecting the detection object; The connecting base includes an alloy arc cover body, a first high-temperature resistant sealing ring, a second high-temperature resistant sealing ring, a vacuum one-way valve and a vacuum pump. A mounting hole is provided at the top center of the alloy arc cover body, and the inner end of the waveguide rod is passed through the mounting hole through the first high-temperature resistant sealing ring to achieve extrusion sealing; the alloy arc cover body is a bucket-shaped structure with an enlarged bottom end, and the second high-temperature resistant sealing ring is arranged at the lower edge of the alloy arc cover body; a suction hole is provided on the alloy arc cover body and the vacuum one-way valve is installed, and the vacuum pump is connected to the vacuum one-way valve through a pipeline.

2. The high temperature corrosion resistant waveguide rod structure according to claim 1, characterized in that: A negative pressure sensor is installed at the suction hole, and the negative pressure sensor is controlled in association with the vacuum pump to control the negative pressure state in the alloy arc cover body.

3. The high temperature corrosion resistant waveguide rod structure according to claim 1 or 2, characterized in that: A plurality of magnetic terminals are fixed to the edges of the alloy arc cover body, and the bottom surfaces of the magnetic terminals are flush with the bottom surface of the second high temperature resistant sealing ring after being deformed by adsorption and compression.

4. The high temperature corrosion resistant waveguide rod structure according to claim 3, characterized in that: The magnetic terminal is coated with a high temperature resistant rubber layer with a thickness of less than 1 mm.

5. The high temperature corrosion resistant waveguide rod structure according to claim 4, characterized in that: The alloy arc cover body is composed of a plurality of arc ribs, an annular frame and a plurality of arc fan surfaces. The plurality of ribs cooperate with the annular frame to form an umbrella-shaped frame, and the plurality of arc fan surfaces are assembled on the umbrella-shaped frame to form the arc cover body.

6. The high temperature corrosion resistant waveguide rod structure according to claim 5, characterized in that: The thickness of the arc surface is ≤1.5 mm, so that under a set negative pressure state, the arc surface is slightly deformed.

7. The high temperature corrosion resistant waveguide rod structure according to claim 1 or 2 or 4 or 5 or 6, characterized in that: The waveguide rod is connected to the first high temperature resistant sealing ring via threads, and the first high temperature resistant sealing ring is fixedly connected to the alloy arc cover.

8. The high temperature corrosion resistant waveguide rod structure according to claim 1 or 2 or 4 or 5 or 6, characterized in that: The waveguide rod is pressed and fixed to the mounting hole of the alloy arc cover body by a first high temperature resistant sealing ring.

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