Pulsed eddy current sensor for detecting corrosion defect of heat exchange tube with fins

Abstract

The utility model relates to the technical field of pipeline monitoring, in particular to a pulsed eddy current sensor for detecting corrosion defects of a finned heat exchange tube, which comprises a base, a first flexible part and a second flexible part are fixed at the bottom of the base, an inner cavity is arranged on the upper surface of the base, and a pulsed eddy current sensor body is arranged in the inner cavity. A buffer pad is fixed to the bottom of the inner cavity, a guide rod is fixed to the surface of the inner cavity, a moving ring is slidably connected to the guide rod, the surface of the guide rod is sleeved with a buffer spring, one end of the buffer spring is fixedly connected to the base, the other end of the buffer spring is fixedly connected to the moving ring, and a limiting assembly and a pulse eddy current sensor body are arranged on the side face of the base. A side square plate is fixed on the surface of the pulsed eddy current sensor body; the device has the beneficial effects that the pulse eddy current sensor body is convenient to mount, the operation is simple, the stability after mounting is ensured, and the efficiency and the accuracy of corrosion defect detection of the heat exchange tube with the fins are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline monitoring, in particular to a pulse eddy current sensor used for detecting corrosion defects of a heat exchange tube with fins. Background Art

[0002] The heat exchange tube is one of the components of the heat exchanger. It is generally installed inside the cylinder and is used for heat exchange between two media. It has high thermal conductivity and good isothermal properties. Since it can quickly transfer heat energy from one point to another with almost no heat loss in the middle, it is also called a heat transfer superconductor.

[0003] In the prior art, the wall thickness of finned heat exchange tubes will be reduced due to corrosion during long-term use. When the wall thickness reduction reaches a certain level, the finned heat exchange tubes are prone to failure and explosion, causing huge economic losses and casualties. Conventional ultrasonic thickness measurement requires a coupling agent and needs to be close to the surface of the heat exchange tube. Therefore, it has limitations for monitoring the wall thickness of the heat exchange tube. The pulsed eddy current technology uses a square wave with a certain duty cycle as the excitation source. The pulse current peak is large and the duration is short. The coil heating problem is reduced. The eddy current can enter deeper areas of the conductor and obtain deeper defect information. It has unique application advantages for monitoring the wall thickness of heat exchange tubes.

[0004] However, the traditional pulsed eddy current sensor is cumbersome to install and disassemble on the heat exchange tube, and has low stability, which reduces the efficiency and accuracy of detection. Therefore, the utility model proposes a pulsed eddy current sensor for corrosion defect detection of heat exchange tubes with fins to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a pulse eddy current sensor for detecting corrosion defects of heat exchange tubes with fins, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pulse eddy current sensor for detecting corrosion defects of heat exchange tubes with fins, the pulse eddy current sensor for detecting corrosion defects of heat exchange tubes with fins comprising: a base, a first flexible member and a second flexible member are fixed to the bottom of the base, an inner cavity is opened on the upper surface of the base, a pulse eddy current sensor body is arranged in the inner cavity, a buffer pad is fixed to the bottom of the inner cavity, a guide rod is fixed to the surface of the inner cavity, a moving ring is slidably connected to the guide rod, a buffer spring is sleeved on the surface of the guide rod, one end of the buffer spring is fixedly connected to the base, the other end of the buffer spring is fixedly connected to the moving ring, and a limit assembly is arranged on the side of the base;

[0007] The pulse eddy current sensor body has a side plate fixed on its surface, a guide hole is provided on the surface of the side plate, and a limit hole is provided on the surface of the pulse eddy current sensor body;

[0008] A limit rod is provided, wherein a fixing piece is fixed on the end surface of the limit rod, a handle is fixed on the surface of the fixing piece, and a support spring is sleeved on the surface of the limit rod.

[0009] Preferably, the limiting assembly includes a limiting plug rod, a supporting spring, a fixing device and a handle, and the limiting assembly is provided with four groups, and the four groups of limiting assemblies are respectively located around the base.

[0010] Preferably, a through hole is provided on the side of the base, the outer wall of the limiting plug rod and the inner wall of the through hole are slidably connected, one end of the support spring is fixedly connected to the base, the other end of the support spring is fixedly connected to the fixture, and the inner surface of the handle is provided with anti-slip texture.

[0011] Preferably, the outer walls of the side panels and the base are slidably connected to the inner walls of the inner cavity.

[0012] Preferably, the outer wall of the guide rod is slidably connected to the inner wall of the guide hole, and the top end of the guide rod is rounded.

[0013] Preferably, the base is mounted on the outer side wall of the heat exchange tube via a first flexible member and a second flexible member, and the first flexible member and the second flexible member are symmetrically distributed about the central axis of the base.

[0014] Preferably, the limiting rod can be inserted into the limiting hole.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model proposes a pulse eddy current sensor for corrosion defect detection of heat exchange tubes with fins. The pulse eddy current sensor body is conveniently installed by utilizing the first flexible part, the second flexible part, the base, the guide rod, the movable ring, the buffer spring and the limit assembly. The utility model is not only simple to operate but also ensures the stability after installation, thereby effectively improving the efficiency and accuracy of corrosion defect detection of heat exchange tubes with fins. In this way, the problem that the traditional pulse eddy current sensor is cumbersome to operate when being installed and disassembled on the heat exchange tube and has low stability, thereby reducing the efficiency and accuracy of detection is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a detailed diagram of the structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the side plate structure of the utility model;

[0020] Figure 4 for Figure 2 A magnified view of the structure in the middle.

[0021] In the figure: 1. base; 2. limit assembly; 3. first flexible member; 4. second flexible member; 5. guide rod; 6. pulse eddy current sensor body; 7. inner cavity; 8. buffer pad; 9. firmware; 10. anti-slip pattern; 11. handle; 12. limit rod; 13. support spring; 14. through hole; 15. side plate; 16. guide hole; 17. limit hole; 18. movable ring; 19. buffer spring. DETAILED DESCRIPTION

[0022] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present utility model, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are proposed to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other. Embodiment 1

[0026] See also Figures 1 to 4 The utility model provides a technical solution: a pulse eddy current sensor for detecting corrosion defects of heat exchange tubes with fins, the pulse eddy current sensor for detecting corrosion defects of heat exchange tubes with fins comprising: a base 1, a first flexible member 3 and a second flexible member 4 are fixed to the bottom of the base 1, an inner cavity 7 is opened on the upper surface of the base 1, a pulse eddy current sensor body 6 is arranged in the inner cavity 7, a buffer pad 8 is fixed to the bottom of the inner cavity 7, a guide rod 5 is fixed to the surface of the inner cavity 7, and a limit assembly 2 is arranged on the side of the base 1;

[0027] A pulse eddy current sensor body 6, a side plate 15 is fixed on the surface of the pulse eddy current sensor body 6, a guide hole 16 is opened on the surface of the side plate 15, a limit hole 17 is opened on the surface of the pulse eddy current sensor body 6, a fixture 9 is fixed on the end surface of the limit rod 12, a handle 11 is fixed on the surface of the fixture 9, and a support spring 13 is sleeved on the surface of the limit rod 12;

[0028] The limit assembly 2 includes a limit rod 12, a support spring 13, a fixing 9 and a handle 11. The limit assembly 2 is provided with four groups, and the four groups of limit assemblies 2 are respectively located around the base 1. The limit rod 12 can be inserted into the limit hole 17;

[0029] When in use, first, install the base 1 on the outer wall of the finned heat exchange tube to be tested through the first flexible part 3 and the second flexible part 4 fixed at the bottom thereof, then manually turn the handle 11 to pull the end of the limit rod 12 into the through hole 14, and keep the state of the limit rod 12, and then insert the guide rod 5 into the guide hole 16 accordingly, thereby providing guidance and support to ensure that the sensor is accurately inserted along the specified path to prevent deviation. The bottom of the base 1 contacts the buffer pad 8 to play a buffering role and protect the sensor from impact. Then release the handle 11. At this time, the through hole 14 and the limit hole 17 are on the same horizontal line. The limit rod 12 is automatically inserted into the limit hole 17 under the rebound action of the support spring 13 to limit the sensor, thereby completing the installation of the sensor. Embodiment 2

[0030] On the basis of the first embodiment, a moving ring 18 is slidably connected to the guide rod 5, a buffer spring 19 is sleeved on the surface of the guide rod 5, one end of the buffer spring 19 is fixedly connected to the base 1, and the other end of the buffer spring 19 is fixedly connected to the moving ring 18;

[0031] When in use, a moving ring 18 is slidably connected to the guide rod 5, and the moving ring 18 slides down during the insertion process of the pulse eddy current sensor body 6. A buffer spring 19 sleeved on the surface of the guide rod 5 is fixed to the base 1 at one end, and fixed to the moving ring 18 at the other end. When the sensor slides down, the buffer spring 19 is compressed to store elastic potential energy, providing stable support for the sensor, while absorbing possible vibrations and enhancing installation stability. Embodiment 3

[0032] On the basis of the second embodiment, a through hole 14 is provided on the side of the base 1, the outer wall of the limiting plug rod 12 and the inner wall of the through hole 14 are slidably connected, one end of the support spring 13 is fixedly connected to the base 1, and the other end of the support spring 13 is fixedly connected to the fixing 9, and an anti-slip pattern 10 is provided on the inner surface of the handle 11, and the base 1 is installed on the outer side wall of the heat exchange tube through the first flexible member 3 and the second flexible member 4, and the first flexible member 3 and the second flexible member 4 are symmetrically distributed about the central axis of the base 1;

[0033] When in use, the anti-slip grooves 10 can increase friction, avoid slipping when the handle 11 is turned, and improve the stability of operation. The first flexible member 3 and the second flexible member 4 are symmetrically distributed about the central axis of the base 1, ensuring that the base 1 can be firmly and adaptively attached to the surface of the heat exchange tube, while allowing a certain angle adjustment to adapt to heat exchange tubes of different diameters and shapes;

[0034] Specifically, the first flexible member 3 and the second flexible member 4 can be straps, and Velcro female buckles are provided at one end of the first flexible member 3 and the second flexible member 4, and Velcro sub-bucks corresponding to the Velcro female buckles are provided at the other end of the first flexible member 3 and the second flexible member 4, for easy installation.

[0035] Working principle: In actual use, first, install the base 1 on the outer wall of the finned heat exchange tube to be detected through the first flexible part 3 and the second flexible part 4 fixed at the bottom thereof, and then manually turn the handle 11 to pull the end of the limit rod 12 into the through hole 14 and maintain the state of the limit rod 12, and then insert the guide rod 5 into the guide hole 16 accordingly, thereby providing guidance and support to ensure that the sensor is accurately inserted along the specified path to prevent deviation. The bottom of the base 1 contacts the buffer pad 8 to play a buffering role and protect the sensor from impact. Then release the handle 11. At this time, the through hole 14 and the limit hole 17 are on the same horizontal line. The limit rod 12 is automatically inserted into the limit hole 17 under the rebound action of the support spring 13 to limit the sensor, thereby completing the installation of the sensor. This avoids the problem that the traditional pulse eddy current sensor is cumbersome to install and disassemble on the heat exchange tube, and has low stability, which reduces the efficiency and accuracy of detection.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pulsed eddy current sensor for detecting corrosion defects of heat exchange tubes with fins, characterized in that: The pulse eddy current sensor for detecting corrosion defects of a heat exchange tube with fins comprises: a base (1), a first flexible member (3) and a second flexible member (4) being fixed to the bottom of the base (1), an inner cavity (7) being provided on the upper surface of the base (1), a pulse eddy current sensor body (6) being arranged in the inner cavity (7), a buffer pad (8) being fixed to the bottom of the inner cavity (7), a guide rod (5) being fixed to the surface of the inner cavity (7), a moving ring (18) being slidably connected to the guide rod (5), a buffer spring (19) being sleeved on the surface of the guide rod (5), one end of the buffer spring (19) being fixedly connected to the base (1), and the other end of the buffer spring (19) being fixedly connected to the moving ring (18), and a limit assembly (2) being arranged on the side of the base (1); A pulsed eddy current sensor body (6), a side plate (15) being fixed on the surface of the pulsed eddy current sensor body (6), a guide hole (16) being provided on the surface of the side plate (15), and a limit hole (17) being provided on the surface of the pulsed eddy current sensor body (6); A limiting plug rod (12) is provided, wherein a fixing piece (9) is fixed to an end surface of the limiting plug rod (12), a handle (11) is fixed to a surface of the fixing piece (9), and a supporting spring (13) is sleeved on the surface of the limiting plug rod (12).

2. The pulsed eddy current sensor for detecting corrosion defects of heat exchange tubes with fins according to claim 1, characterized in that: The limiting assembly (2) comprises a limiting rod (12), a supporting spring (13), a fixing member (9) and a handle (11). The limiting assembly (2) is provided with four groups, and the four groups of limiting assemblies (2) are respectively located around the base (1).

3. A pulsed eddy current sensor for detecting corrosion defects of heat exchange tubes with fins according to claim 2, characterized in that: A through hole (14) is provided on the side of the base (1), the outer wall of the limiting plug rod (12) and the inner wall of the through hole (14) are slidably connected, one end of the support spring (13) is fixedly connected to the base (1), the other end of the support spring (13) is fixedly connected to the fixing member (9), and the inner surface of the handle (11) is provided with anti-slip patterns (10).

4. The pulsed eddy current sensor for detecting corrosion defects of heat exchange tubes with fins according to claim 1, characterized in that: The side plates (15) and the outer walls of the base (1) are slidably connected to the inner wall of the inner cavity (7).

5. The pulsed eddy current sensor for detecting corrosion defects of heat exchange tubes with fins according to claim 1, characterized in that: The outer wall of the guide rod (5) is slidably connected to the inner wall of the guide hole (16), and the top end of the guide rod (5) is chamfered.

6. The pulsed eddy current sensor for detecting corrosion defects of heat exchange tubes with fins according to claim 1, characterized in that: The base (1) is mounted on the outer side wall of the heat exchange tube via a first flexible member (3) and a second flexible member (4); the first flexible member (3) and the second flexible member (4) are symmetrically distributed about the central axis of the base (1).

7. The pulsed eddy current sensor for detecting corrosion defects of heat exchange tubes with fins according to claim 1, characterized in that: The limiting insertion rod (12) can be inserted into the limiting hole (17).

Images