Fretting wear test device for heat transfer tube

Abstract

The invention belongs to the technical field of heat transfer pipe fretting wear, and particularly relates to a heat transfer pipe fretting wear test device. The driving motor is horizontally fixed on the bottom plate; the transmission shaft is fixed on the driving motor; the upper part and the lower part of the support supporting piece are concentric and fixed with the transmission shaft; the heat transfer tube positioning piece and the heat transfer tube are concentrically positioned and are fixed on the heat transfer tube support together; the heat transfer tube support is fixed on the support supporting piece; the anti-vibration strip is fixed on the anti-vibration strip support; the screw rod support is fixed on the bottom plate, and the sliding block is placed on a track of the screw rod support; two holes are formed in the front and the back of the sliding block, one through hole is connected with the screw rod, the other threaded hole is connected with the spring rod, the anti-vibration strip supporting seat is installed on the spring rod, the screw rod is fixed on the screw rod supporting seat through a bearing, the hand wheel is fixed on the screw rod, and the spring rod is perpendicular to the transmission shaft. Movement of the heat transfer tube and the anti-vibration strip under different mechanical parameters can be accurately simulated, and the fretting wear test problem of the heat transfer tubes of different specifications is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of fretting wear of heat transfer tubes, and in particular relates to a fretting wear test device for heat transfer tubes. Background Art

[0002] The heat transfer tube is a very important part of the steam generator. It is the main heat exchange component and the weakest pressure boundary. Due to the internal turbulence, the flow-induced vibration of the heat transfer tube is difficult to avoid. Due to the gap between the heat transfer tube and the support due to assembly, the heat transfer tube will produce micro-motion wear with the support under the action of turbulent excitation, and micro-motion wear is the main form of heat transfer tube failure. The long-term accumulation of wear will cause the heat transfer tube to rupture and cause the leakage of radioactive media in the first circuit, which is very harmful. Therefore, the integrity of the tube bundle is crucial to the safety and economic benefits of the entire steam generator. Therefore, it is necessary to conduct micro-motion wear tests on the heat transfer tubes to study the influence of different mechanical parameters on the wear rate of the heat transfer tubes. Summary of the invention

[0003] The purpose of the present invention is to provide a heat transfer tube fretting wear test device, which can accurately simulate the movement of the heat transfer tube and the anti-vibration strip under different mechanical parameters. At the same time, different support seats can be designed for heat transfer tubes of different specifications, so that heat transfer tubes and anti-vibration strips of different specifications can also be tested on the device. The test device has a simple design, clear principles, and is easy to install, and can effectively solve the fretting wear test problem of heat transfer tubes of different specifications.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A heat transfer tube fretting wear test device, wherein a driving motor is horizontally fixed on a bottom plate, a transmission shaft is fixed on the driving motor; the upper and lower parts of a support member are kept concentric with the transmission shaft and fixed; a heat transfer tube positioning member is concentrically positioned with the heat transfer tube and fixed together on a heat transfer tube support; the heat transfer tube support is fixed on the support member; an anti-vibration bar is fixed on an anti-vibration bar support; a screw support is fixed on the bottom plate, and a slider is placed on a track of the screw support; two holes are provided at the front and rear of the slider, one through hole is connected to the screw, and the other threaded hole is connected to a spring rod, an anti-vibration bar support seat is installed on the spring rod, the screw is fixed on the screw support with a bearing, a hand wheel is fixed on the screw, and the spring rod and the transmission shaft are perpendicular to each other.

[0006] The base plate remains horizontal and fixed to the ground.

[0007] The upper and lower parts of the bearing support are kept concentric with the transmission shaft and fixed with bolts.

[0008] The heat transfer tube support is fixed to the support member by bolts.

[0009] Fix the anti-vibration bar to the anti-vibration bar support with countersunk bolts.

[0010] The anti-vibration bar support is installed on the spring rod with bolts.

[0011] The handwheel is fixed on the screw with a flat key.

[0012] The spring rod is kept concentric with the slider and the anti-vibration bar support.

[0013] The displacement sensor is fixed on the transmission shaft.

[0014] The two force sensors are respectively fixed on the anti-vibration bar support seat along the direction of the transmission shaft and the spring rod.

[0015] The beneficial effects achieved by the present invention are:

[0016] The present invention can solve the problem of micro-motion wear test of heat transfer tubes, requiring that the displacement amplitude of the heat transfer tubes should not be too large, and that the normal contact force should be within the elastic limit of the spring rod. For other similar heat transfer tubes of different specifications, the test conditions can also be met by designing different support seats. By setting different clamps, the wear between heat transfer tubes of different specifications and anti-vibration strips can be achieved, and relative movement in different directions can also be achieved; the present invention can obtain test data and wear morphology results under different contact forces and different excitation conditions. At the same time, the excitation device in the present invention is simple to install and disassemble, the work process is clear, and it is suitable for the wear test research of heat transfer tubes of steam generators in pressurized water reactor nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a heat transfer tube fretting wear test device;

[0018] Figure 2 This is a schematic diagram of the installation of the support member;

[0019] Figure 3 This is a schematic diagram of heat transfer tube installation;

[0020] Figure 4 This is a schematic diagram of the installation of the anti-vibration strip;

[0021] Figure 5 It is the working diagram of the impact shaft;

[0022] Figure 6 Schematic diagram of the relative movement direction of the heat transfer tubes.

[0023] In the figure: 1 bottom plate, 2 transmission shaft, 3 support support, 4 heat transfer tube support, 5 heat transfer tube positioning member, 6 heat transfer tube, 7 anti-vibration bar, 8 anti-vibration bar support, 9 spring rod, 10 slider, 11 screw, 12 screw support, 13 hand wheel, 14 drive motor, 15 bearing. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] The bottom plate 1 is kept horizontally fixed on the ground; the driving motor 14 is fixed horizontally on the bottom plate 1, and the transmission shaft 2 is fixed on the driving motor 14; the upper and lower parts of the support member 3 are kept concentric with the transmission shaft 2 and fixed with bolts; the heat transfer tube positioning member 5 is concentrically positioned with the heat transfer tube 6 and fixed together on the heat transfer tube support 4; the heat transfer tube support 4 is fixed to the support member 3 with bolts to complete the installation of the heat transfer tube 6; the anti-vibration strip 7 is fixed to the anti-vibration strip support 8 with countersunk bolts; the screw support 12 is fixed on the bottom plate 1, and the slider 10 is placed on the track of the screw support 12; the slider 10 has two holes at the front and back, one through hole is connected to the screw 11, and the other threaded hole is connected to the spring rod 9, the anti-vibration strip support seat 8 is bolted to the spring rod 9, the screw 11 is fixed to the screw support 12 with a bearing 15, the hand wheel 13 is fixed to the screw 11 with a flat key, and the forward and backward movement of the slider is controlled by the rotation of the hand wheel. The spring rod 9 is concentric with the slider 10 and the anti-vibration bar support 8, and the spring rod 9 is perpendicular to the transmission shaft 2; the displacement sensor is fixed on the transmission shaft 2, and the two force sensors are respectively fixed on the anti-vibration bar support 8 along the direction of the transmission shaft 2 and the spring rod 9 to complete the installation of the sensor.

[0026] The device can also design different support seats for heat transfer tubes of different specifications to meet the test requirements of heat transfer tubes of other specifications. The device can simulate the movement of heat transfer tubes and anti-vibration strips under different mechanical parameters, and can also design different support seats for heat transfer tubes of different specifications, so that heat transfer tubes and anti-vibration strips of different specifications can also be tested on the device. The main advantages of the device are simple design, easy installation, strong applicability, and can meet the test requirements of heat transfer tubes of different specifications. The device uses a screw mechanism to drive the spring rod to apply a normal load to the heat transfer tube, and fully utilizes the self-locking effect of the thread to maintain the stability of the normal load during the test. Then, a motor is used to drive the heat transfer tube to move, and an eddy current sensor on the transmission shaft is used to monitor the movement of the heat transfer tube. At the same time, two force sensors on the anti-vibration strip support seat are used to monitor the normal contact force and friction force during the wear process, and the test results are evaluated. The test device is used to study the influencing factors of fretting wear of heat transfer tubes, analyze the fretting wear behavior of heat transfer tubes, and thus increase the service life of steam generators.

Claims

1. A heat transfer tube fretting wear test device, characterized in that: The driving motor is fixed horizontally on the base plate, and the transmission shaft is fixed on the driving motor; the upper and lower parts of the support member are concentric and fixed with the transmission shaft; the heat transfer tube positioning member is concentrically positioned with the heat transfer tube and fixed together on the heat transfer tube support; the heat transfer tube support is fixed on the support member; the anti-vibration bar is fixed on the anti-vibration bar support; the screw support is fixed on the base plate, and the slider is placed on the track of the screw support; there are 2 holes in front and behind the slider, one through hole is connected to the screw, and the other threaded hole is connected to the spring rod, the anti-vibration bar support seat is installed on the spring rod, the screw is fixed on the screw support with a bearing, the hand wheel is fixed on the screw, and the spring rod and the transmission shaft are perpendicular to each other.

2. The heat transfer tube fretting wear test device according to claim 1, characterized in that: The base plate remains horizontal and fixed to the ground.

3. The heat transfer tube fretting wear test device according to claim 1, characterized in that: The upper and lower parts of the bearing support are kept concentric with the transmission shaft and fixed with bolts.

4. The heat transfer tube fretting wear test device according to claim 1, characterized in that: The heat transfer tube support is fixed to the support member by bolts.

5. The heat transfer tube fretting wear test device according to claim 1, characterized in that: Fix the anti-vibration bar to the anti-vibration bar support with countersunk bolts.

6. The heat transfer tube fretting wear test device according to claim 1, characterized in that: The anti-vibration bar support is installed on the spring rod with bolts.

7. The heat transfer tube fretting wear test device according to claim 1, characterized in that: The handwheel is fixed on the screw with a flat key.

8. The heat transfer tube fretting wear test device according to claim 1, characterized in that: The spring rod is kept concentric with the slider and the anti-vibration bar support.

9. The heat transfer tube fretting wear test device according to claim 1, characterized in that: The displacement sensor is fixed on the transmission shaft.

10. The heat transfer tube fretting wear test device according to claim 1, characterized in that: The two force sensors are respectively fixed on the anti-vibration bar support seat along the direction of the transmission shaft and the spring rod.

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