Crossed potentiometer protection for heavy water reactor fuel channel drain station

Abstract

The application relates to a heavy water reactor fuel channel discharge station transverse potentiometer protection device, which comprises a protective cover (05); the protective cover (05) is a semicircular tile structure, is buckled on the upper portion of a transverse potentiometer (04) and covers the portion above the horizontal center of the shell of the transverse potentiometer (04); a shunt strip is arranged on the upper center of the protective cover (05) in an axial direction. The heavy water reactor fuel channel discharge station transverse potentiometer protection device can prevent the leakage of heavy water and hydraulic oil from entering the transverse potentiometer during the operation of a loading and unloading machine, ensures that the transverse potentiometer can normally operate, prolongs the service life of the transverse potentiometer and saves the cost of a company.

Description

Technical Field

[0001] This invention relates to the field of heavy water reactor fuel operation and drainage station technology, and in particular to a horizontal potentiometer protection device for a heavy water reactor fuel channel drainage station. Background Technology

[0002] Both heavy water reactor units at Qinshan Nuclear Power Plant operate on a non-stop refueling system. The fuel channel drainage station is a drainage channel constructed after the refueling machine loads new fuel and unloads spent fuel, during maintenance and related procedures. This allows heavy water from the refueling machine to be collected in a heavy water collection tank. After the refueling machine unloads fuel, the fuel channel drainage station retracts to prevent foreign objects from entering.

[0003] The horizontal cylinder is connected to the fuel channel drainage station via a linkage mechanism, which drives the fuel channel drainage station to rise / fall. The horizontal potentiometer connected to the horizontal cylinder sends analog signals to the main control room to indicate the rise / fall status of the fuel channel drainage station.

[0004] When the loading / unloading machine is in the clamping / unclamping channel, heavy water and hydraulic oil drip onto the linkage mechanism or the horizontal potentiometer body. As the horizontal potentiometer moves with the horizontal cylinder, the heavy water and hydraulic oil dripping onto it flow to the linkage mechanism. When the linkage mechanism moves, the heavy water and hydraulic oil enter the horizontal potentiometer, causing it to malfunction. Summary of the Invention

[0005] Therefore, it is necessary to provide a protection device for the horizontal potentiometer in the heavy water reactor fuel channel drainage station to address the problem of heavy water and hydraulic oil leakage entering the horizontal potentiometer during the operation of the loading and unloading machine, which causes the horizontal potentiometer to fail. This device can prevent heavy water and hydraulic oil leakage from entering the horizontal potentiometer during the operation of the loading and unloading machine, ensuring the normal operation of the horizontal potentiometer, extending the service life of the horizontal potentiometer, and saving costs for the company.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A protection device for a horizontal potentiometer in a heavy water reactor fuel channel drainage station includes a protective cover; the protective cover is a semi-circular tile-shaped structure, which is fastened to the upper part of the horizontal potentiometer and covers the part above the horizontal center of the horizontal potentiometer housing; a flow divider is provided along the axial direction at the center of the upper part of the protective cover.

[0008] The semi-circular arc of the protective cover and the diversion strip prevent heavy water and hydraulic oil from entering the interior of the horizontal potentiometer from the front end.

[0009] Furthermore, the protective cover is secured to the horizontal potentiometer.

[0010] Furthermore, the protective cover is clamped onto the horizontal potentiometer by an elastic clip, and the protective cover and the elastic clip are fixed together by rivets, making it easy to assemble and disassemble.

[0011] Furthermore, a rubber gasket is provided between the elastic retainer and the horizontal potentiometer. The rubber gasket prevents heavy water and hydraulic oil from entering the horizontal potentiometer from the rear end of the horizontal potentiometer through the linkage mechanism.

[0012] In one embodiment, the protective cover is clamped to the horizontal potentiometer by two elastic clips.

[0013] Furthermore, the right end of the protective cover is provided with a limiting side plate that matches the side of the square structure of the horizontal potentiometer cable socket. The limiting side plate is in contact with the side of the square structure of the horizontal potentiometer cable socket. Under the action of the elastic clamp and the limiting side plate, the protective cover will not rotate circumferentially.

[0014] Furthermore, the front end of the protective cover is provided with a stop structure that matches the end cap step of the horizontal potentiometer. The stop structure contacts and limits the contact with the end cap step of the horizontal potentiometer. A pre-tightening strip is provided between the limiting side plate and the side of the square structure of the horizontal potentiometer cable socket. Under the action of the elastic clamp and the pre-tightening strip, the protective cover will not move axially back and forth.

[0015] Furthermore, the protective cover is made of transparent material, which facilitates the inspection and observation of the actual status of the potentiometer by the personnel changing materials.

[0016] Furthermore, the shunt strip of the protective cover is provided with a conspicuous identification line along the axis to warn personnel near the horizontal potentiometer and prevent accidental contact.

[0017] Furthermore, the protective cover weighs 50g, which does not affect the normal operation of the horizontal potentiometer.

[0018] Beneficial technical effects of the present invention:

[0019] The horizontal potentiometer protection device for the heavy water reactor fuel channel drainage station of the present invention is safe, reliable, easy to use, highly stable, and economically efficient. It avoids the risk of workers being exposed to accidental doses, ensures the safety of operators, and meets the normal operation requirements of power plant fuel handling equipment.

[0020] The present invention relates to a protection device for a horizontal potentiometer in a heavy water reactor fuel channel drainage station. This device prevents heavy water and hydraulic oil leaking during the operation of the loading and unloading machine from entering the potentiometer, ensuring that the potentiometer can operate normally and provide accurate data feedback. This facilitates inspection and observation by operators to confirm the status of the heavy water reactor fuel channel drainage station, while also extending the service life of the horizontal potentiometer and saving costs for the company. Attached Figure Description

[0021] Figure 1 A static schematic diagram of a horizontally positioned potentiometer at a heavy water reactor fuel channel drainage station.

[0022] Figure 2 A dynamic schematic diagram of a horizontally placed potentiometer at a heavy water reactor fuel channel drainage station.

[0023] Figure 3 Exploded view of the horizontal potentiometer protection device for the fuel channel drainage station of a heavy water reactor;

[0024] Figure 4 Main view of the horizontal potentiometer protection device at the heavy water reactor fuel channel drainage station;

[0025] Figure 5 Cross-sectional view of the horizontal potentiometer protection device in the fuel channel drainage station of the heavy water reactor;

[0026] Figure 6 A partial top view of the horizontal potentiometer protection device at the heavy water reactor fuel channel drainage station.

[0027] In the diagram, 01-fuel channel drainage station; 02-linkage mechanism; 03-horizontal cylinder; 04-horizontal potentiometer; 05-protective cover; 06-clamp; 07-rivet; 08-rubber gasket; 09-pre-tightening rubber strip; 10-limiting side plate; 11-stop structure; 12-diverter strip. Detailed Implementation

[0028] In the description of this invention, it should be understood that the terms "front end", "rear end", "left end", "right end", "above", "below", "outer side", "inner side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0029] See Figure 1-2 The horizontal cylinder 03 is connected to the fuel channel drainage station 01 via the linkage mechanism 02, causing the fuel channel drainage station 01 to rise / fall. The horizontal potentiometer 04, connected to the horizontal cylinder 03, sends an analog signal to the main control room to indicate the rising / falling status of the fuel channel drainage station 01. When the loading / unloading machine is clamping / unclamping the channel, heavy water and hydraulic oil drip onto the linkage mechanism 02 or the horizontal potentiometer 04. When the horizontal potentiometer 04 moves with the horizontal cylinder 03, the heavy water and hydraulic oil dripping onto the horizontal potentiometer 04 flow to the linkage mechanism 02. When the heavy water and hydraulic oil move with the linkage mechanism 02, they enter the interior of the horizontal potentiometer 04, causing the horizontal potentiometer 04 to malfunction.

[0030] Because the horizontal potentiometer 04 is in a horizontal position, and the horizontal potentiometer 04 moves together with the horizontal cylinder 03 when the fuel channel drainage station 01 rises and falls, the movement of the horizontal cylinder 03 is not completely horizontal; there is a process of the end slightly downward-rising about 10 degrees-and-reaching horizontal. The fuel channel drainage station 01 is movable, and the main body cannot be drilled or fixed in position. During inspections, operators must confirm the actual position of the horizontal potentiometer 04. The invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] See Figure 3-6 This invention provides a protection device for a horizontal potentiometer in a heavy water reactor fuel channel drainage station, including a protective cover 05. The protective cover 05 has a semi-circular tile-like structure, which is fastened to the upper part of the horizontal potentiometer 04, covering the portion above the horizontal center of the horizontal potentiometer 04 housing. A flow divider is axially arranged at the upper center of the protective cover 05. The semi-circular arc and flow divider of the protective cover 05 prevent heavy water and hydraulic oil from entering the interior of the horizontal potentiometer 04 from the front end.

[0033] Furthermore, the protective cover 05 and the elastic clamp 06 are fixed by rivets 07, and the protective cover 05 is clamped to the horizontal potentiometer 04 by two elastic clamps 06, making disassembly and assembly convenient. The necessary clamping force of the elastic clamp 06 is calculated and analyzed, the elastic clamp 06 is machined, and its clamping force is verified through simulation tests.

[0034] Furthermore, a rubber gasket 08 is provided between the elastic retaining clip 06 and the horizontal potentiometer 04. The rubber gasket 08 prevents heavy water and hydraulic oil from entering the horizontal potentiometer 04 from the rear end of the horizontal potentiometer 04 through the linkage mechanism 02.

[0035] Furthermore, the right end of the protective cover 05 is provided with a limiting side plate 10 that matches the side of the square structure of the horizontal potentiometer 04 cable socket. The limiting side plate 10 contacts and limits the side of the square structure of the horizontal potentiometer 04 cable socket. Under the action of the elastic clamp 06 and the limiting side plate 10, the protective cover 05 will not rotate circumferentially.

[0036] Furthermore, the front end of the protective cover 05 is provided with a stop structure 11 that matches the end cap step of the horizontal potentiometer 04. The stop structure 11 contacts and limits the contact with the end cap step of the horizontal potentiometer 04. Three pre-tightening rubber strips 09 are installed between the limiting side plate 10 and the side of the square structure of the cable socket of the horizontal potentiometer 04. Under the action of the elastic clamp 06 and the pre-tightening rubber strips 09, the protective cover 05 will not move axially back and forth.

[0037] Furthermore, the protective cover 05 is made of transparent sheet or rod with uniform density through rolling or extrusion, and is formed by 5-axis CNC machining or integral pressing with a mold, which facilitates the inspection and observation of the actual status of the potentiometer by the material changing operation personnel.

[0038] Furthermore, the diverter bar 12 of the protective cover 05 is provided with a conspicuous identification line along the axis to warn personnel near the horizontal potentiometer and prevent accidental contact.

[0039] Furthermore, the protective cover 05 weighs 50g and does not affect the normal operation of the horizontal potentiometer 04.

[0040] In use, the protective cover 05 is fastened onto the upper part of the horizontal potentiometer 04; the protective cover 05 is clamped to the horizontal potentiometer 04 by the elastic clamp 06, and a rubber gasket 08 is provided between the elastic clamp 06 and the horizontal potentiometer 04; the limiting side plate 10 at the rear end of the protective cover 05 is in contact with the side of the square structure of the cable socket of the horizontal potentiometer 04 to ensure that the pre-tightening rubber strip 09 is in the pre-tightened state; the stop structure 11 at the front end of the protective cover 05 is in contact with the end cover step of the horizontal potentiometer 04.

[0041] After the installation of the horizontal potentiometer protection device of the present invention in the heavy water reactor fuel channel drainage station of the two heavy water reactor units of Qinshan Nuclear Power Plant, no voltage drift of the horizontal potentiometer 04 caused by heavy water and hydraulic oil leakage has occurred, resulting in valve status asymmetry. This has saved the company a lot of money every year, reduced the power plant production cost, and ensured the stable operation of fuel operation equipment.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A heavy water reactor fuel channel decontamination station transverse potentiometer protection device characterized by, Includes a protective cover (05); the protective cover (05) is a semi-circular tile-shaped structure, which is fastened to the upper part of the horizontal potentiometer (04) and covers the part above the horizontal center of the housing of the horizontal potentiometer (04); a shunt bar is provided along the axial direction at the upper center of the protective cover (05); The protective cover (05) is clamped onto the horizontal potentiometer (04) by an elastic clamp (06), and the protective cover (05) and the elastic clamp (06) are fixed by rivets (07); a rubber gasket (08) is provided between the elastic clamp (06) and the horizontal potentiometer (04).

2. The heavy water reactor fuel channel decontamination station in-line potentiometer protection device of claim 1, wherein, The protective cover (05) is attached to the horizontal potentiometer (04).

3. The heavy water reactor fuel channel decontamination station in-line potentiometer protection device of claim 1, wherein, The protective cover (05) is clamped to the horizontal potentiometer (04) by two elastic clips (06).

4. The heavy water reactor fuel channel decontamination station horizontal potentiometer guard of claim 1, wherein, The right end of the protective cover (05) is provided with a limiting side plate (10) that matches the side of the square structure of the horizontal potentiometer (04) cable socket. The limiting side plate (10) is in contact with the side of the square structure of the horizontal potentiometer (04) cable socket.

5. The heavy water reactor fuel channel decontamination station in-line potentiometer protection device of claim 4, wherein, The protective cover (05) has a stop structure (11) at the front end that matches the end cap step of the horizontal potentiometer (04). The stop structure (11) contacts and limits the end cap step of the horizontal potentiometer (04). A pre-tightening strip (09) is provided between the limiting side plate (10) and the side of the square structure of the cable socket of the horizontal potentiometer (04).

6. The heavy water reactor fuel channel decontamination station horizontal potentiometer guard of any one of claims 1-5, wherein, The protective cover (05) is made of transparent material.

7. The heavy water reactor fuel channel decontamination station horizontal potentiometer guard of any one of claims 1-5, wherein, The diversion strip (12) of the protective cover (05) is provided with a conspicuous identification line along the axis.

8. The protection device for the horizontal potentiometer of the heavy water reactor fuel channel drainage station according to any one of claims 1-5, characterized in that, The protective cover (05) weighs 50g.

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