A device for installing and fixing an acceleration sensor of loose parts in a nuclear power plant

Abstract

The present invention belongs to the field of mechanical design technology, and specifically relates to a device for installing and fixing an acceleration sensor of a loose component of a nuclear power plant. The present invention includes a fixing screw hole, a baffle, a supporting bayonet, a supporting plate, and a fixing plate, wherein a baffle, two supporting plates, and two fixing plates are formed by bending a steel plate, and a supporting bayonet is provided in the middle of the baffle; the fixing plate is parallel to the baffle; and two screw holes are provided at the top of each fixing plate. The present invention can make up for the deficiencies in sensor design, installation, and manufacturing; it can stably install the acceleration sensor on the arc surface of a loop pipeline without affecting the sensitivity of the detector; after being put into use for a long time, there has been no case of the acceleration sensor falling off or malfunctioning.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical design, and in particular relates to a device for installing and fixing an acceleration sensor of a loose component of a nuclear power plant. Background Art

[0002] The loose parts monitoring system of a nuclear power plant detects free objects and loose equipment parts in the coolant by monitoring the surface noise of the reactor device. Its sensors are installed locally and the probes are 20 piezoelectric acceleration sensors. In the prior art, the sensors are installed on the surface of the equipment by magnet adsorption, such as Figure 1 As shown;

[0003] Due to the high sensitivity of the loose parts monitoring system, when a loose part appears in the main circuit and causes an impact signal, multiple sensor channels near the impact position will monitor the impact signal. When the sensor falls off and causes channel failure, the data collection of the impact signal at the corresponding position will be lost, and the subsequent detailed analysis of the impact signal and determination of the fallen parts cannot be completed.

[0004] According to operating data, 54% of operational failures in the loose parts monitoring system are caused by sensors falling off the equipment surface, and the falling off of sensors installed on the surface of a loop pipeline accounts for more than 90% of the total falling off times. Their falling off has become the main factor affecting the stability of the loose parts monitoring system.

[0005] After analysis, the following reasons were found for the sensor to fall off the surface of the monitoring equipment: 1. The surface of the primary-loop pipe is curved, and the uneven installation surface will lead to insufficient adsorption force of the magnet; 2. The equipment itself has downward gravity; 3. The armored cable is in a bent state, and there is stress that pulls the sensor outward; 4. The vibration of the primary-loop pipe will affect the adsorption force of the magnet.

[0006] Based on the above situation, measures must be taken to ensure that the acceleration sensor is stably installed on the curved surface of the primary-loop pipeline. Summary of the invention

[0007] The technical problem solved by the present invention is as follows: In view of the deficiencies of the prior art, a device for installing and fixing an acceleration sensor of a loose component of a nuclear power plant is provided, which can stably install the acceleration sensor on the arc surface of a loop pipeline without affecting the sensitivity of the detector.

[0008] The technical solution adopted by the present invention is:

[0009] A device for installing and fixing an acceleration sensor of a loose component of a nuclear power plant comprises: an equipment installation surface, a magnet, a piezoelectric acceleration sensor, an armored cable, an equipment insulation layer, and also comprises fixing screw holes, a baffle, a supporting bayonet, a supporting plate, and a fixing plate. A baffle, two supporting plates, and two fixing plates are formed by bending a steel plate, a supporting bayonet is provided in the middle of the baffle; the fixing plate is parallel to the baffle; and two screw holes are provided at the top of each fixing plate.

[0010] The magnet is adsorbed on the equipment installation surface, the piezoelectric acceleration sensor is installed on the magnet, the baffle is pressed on the piezoelectric acceleration sensor, the armored cable is led out from the piezoelectric acceleration sensor and passes through the supporting bayonet on the baffle; an equipment insulation layer is provided on the outside of the equipment, and the fixing plate is fixedly connected to the equipment insulation layer.

[0011] Beneficial effects of the present invention:

[0012] The invention provides a device for installing and fixing an acceleration sensor of a loose component of a nuclear power plant, which can make up for the deficiencies in the design, installation and manufacture of the sensor; the acceleration sensor can be stably installed on the arc surface of a primary-loop pipeline without affecting the sensitivity of the detector; and after being put into use for a long time, there has been no case of the acceleration sensor falling off or malfunctioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a piezoelectric sensor installation method in the prior art;

[0014] Figure 2 A schematic diagram of the structure of the sensor installation and fixing device provided by the present invention;

[0015] Figure 3 A schematic diagram of the installation of the sensor installation and fixing device provided by the present invention;

[0016] In the figure: 1-equipment installation surface; 2-magnet; 3-piezoelectric acceleration sensor; 4-armored cable; 5-fixing device; 6-equipment insulation layer; 7-fixing screw hole; 8-baffle; 9-support bayonet; 10-support plate; 11-fixing plate. DETAILED DESCRIPTION

[0017] The following is a further detailed description of a device for installing and fixing an acceleration sensor of a loose component of a nuclear power plant provided by the present invention in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 2As shown, a device for installing and fixing an acceleration sensor of a loose component of a nuclear power plant provided by the present invention comprises a fixing screw hole 7, a baffle 8, a supporting bayonet 9, a supporting plate 10, and a fixing plate 11, wherein one baffle 8, two supporting plates 10, and two fixing plates 11 are formed by bending a steel plate, a supporting bayonet 9 is provided in the middle of the baffle 8; the fixing plate 11 is parallel to the baffle 8; and two screw holes 7 are provided at the top of each fixing plate 11.

[0019] like Figure 3 As shown, the magnet 2 is adsorbed on the equipment installation surface 1, the piezoelectric acceleration sensor 3 is installed on the magnet 2, the baffle 8 of the fixing device 5 is pressed on the piezoelectric acceleration sensor 3, the armored cable 4 is led out from the piezoelectric acceleration sensor 3 and passes through the supporting bayonet 9 on the baffle 8; an equipment insulation layer 6 is provided on the outside of the equipment, and the fixing plate 11 of the fixing device 5 is fixedly connected to the equipment insulation layer 6 by screws.

Claims

1. A device for installing and fixing an acceleration sensor of a loose component of a nuclear power plant, comprising: The device installation surface (1), the magnet (2), the piezoelectric acceleration sensor (3), the armored cable (4), and the device insulation layer (6) are characterized by: further comprising a fixing screw hole (7), a baffle (8), a supporting bayonet (9), a supporting plate (10), and a fixing plate (11); a baffle (8), two supporting plates (10), and two fixing plates (11) are formed by bending a steel plate; a supporting bayonet (9) is provided in the middle of the baffle (8); and the fixing plate (11) is parallel to the baffle (8); Two screw holes (7) are formed at the top of each fixing plate (11); the magnet (2) is adsorbed on the device installation surface (1); the piezoelectric acceleration sensor (3) is installed on the magnet (2); the baffle (8) is pressed on the piezoelectric acceleration sensor (3); the armored cable (4) is led out from the piezoelectric acceleration sensor (3) and passes through the supporting bayonet (9) on the baffle (8); an equipment insulation layer (6) is provided outside the device; the fixing plate (11) is fixedly connected to the equipment insulation layer (6) by screws.

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