A device and method for adjusting 3582 positioner in nuclear power plant

Abstract

The present invention belongs to the technical field of nuclear power plant instrumentation and control equipment maintenance engineering, and specifically relates to a device and a method for use for adjusting a 3582 positioner in a nuclear power plant. The present invention includes an A-hole fixing screw, a B-hole fixing screw, a butterfly locking nut, a slide rail, and a 10mm special thin wrench. The 10mm special thin wrench is slidably connected to the slide rail, and the other end of the 10mm special thin wrench is connected to the nozzle. The whole process of the present invention is simple and efficient, which greatly increases the service life of the nozzle fastening bolts, greatly reduces the maintenance personnel's absorption of the radiation dose of the valve environment, and effectively ensures that the nozzle remains in position after each nozzle bolt is tightened. It can also ensure that the zero point drift caused by loose nozzle tightening will lead to abnormal valve control and even unit shutdown, effectively solving the common problem that the nozzle of the 3582 series positioner cannot be well fixed.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant instrumentation and control equipment maintenance engineering, and specifically relates to a device and a use method for adjusting a 3582 positioner of a nuclear power plant. Background Art

[0002] There are more than one hundred pneumatic regulating valves in the unit island of a nuclear power plant, which play an important role in the normal operation of the entire unit.

[0003] The positioner on the pneumatic control valve is the core component of valve control. The positioner types on the island are all Fisher 3582 series. There is no alternative solution for this series of mechanical positioners in China, so there is no good domestic method to learn from.

[0004] The reference power station had an incident where the nozzle fixing bolts loosened due to valve vibration, resulting in abnormal valve control. Similar situations were also found during the commissioning of the pneumatic valves of units 5 and 6. In addition, during the process of tightening the nozzle fastening bolts, the nozzle will "follow the rotation phenomenon" due to structural reasons. It is necessary to repeatedly loosen the nozzle fastening bolts to adjust the position of the nozzle, which not only reduces the service life of the nozzle fastening bolts but also consumes a lot of time for maintenance personnel. Summary of the invention

[0005] The purpose of the present invention is to provide a device and a method for adjusting the 3582 positioner of a nuclear power plant, which can ensure that the process of tightening the nozzle bolts is stable and reliable, and the whole process is simple and efficient, which greatly increases the service life of the nozzle fastening bolts, greatly reduces the absorption of radiation doses by maintenance personnel for the environment in which the valve is located, and effectively ensures that the nozzle remains in the same position after the nozzle bolts are tightened each time, and can ensure that the zero point drift caused by loose nozzle tightening will not cause abnormal valve control or even unit shutdown. The device is generally applicable to 3582 series positioners and can fully meet the on-site use requirements of the unit. It is also applicable to power stations with M310 units, effectively solving the common problem that the nozzles of the 3582 series positioners cannot be well fixed.

[0006] The technical solution adopted by the present invention is:

[0007] A device for adjusting a 3582 positioner of a nuclear power plant comprises an A-hole fixing screw, a B-hole fixing screw, a butterfly locking nut, a slide rail, and a 10mm special thin wrench. The 10mm special thin wrench is slidably connected to the slide rail, and the other end of the 10mm special thin wrench is connected to a nozzle.

[0008] The slide rail is provided with holes that match the A hole and the B hole.

[0009] The slide rail is fixed on the 3582 positioner through the A hole fixing screw and the B hole fixing screw.

[0010] The A hole fixing screw is installed in the A hole, and the B hole fixing screw is installed in the B hole.

[0011] The 10mm special thin wrench is provided with a through hole.

[0012] The through hole is connected to the slide rail via a butterfly locking nut.

[0013] The 10 mm special thin wrench slides in the slide rail and is tightened by a butterfly lock nut.

[0014] A method for using a device for adjusting a 3582 positioner in a nuclear power plant comprises the following steps:

[0015] Step 1. Use the A hole fixing screw and the B hole fixing screw to fix the slide rail in the A hole and B hole of the positioner;

[0016] Step 2: Loosen the butterfly lock nut on the slide rail and adjust the angle of the 10mm special thin wrench appropriately through the slide rail;

[0017] Step 3. Aim the 10mm special thin wrench at the nozzle, and tighten the butterfly lock nut on the slide rail to ensure that the nozzle is firmly fixed;

[0018] Step 4. Use a 13mm thin wrench to tighten the nozzle fastening bolts;

[0019] Step 5. Loosen the butterfly locking nut on the slide rail;

[0020] Step 6. Remove the 10mm special thin wrench;

[0021] Step 7. Loosen the fixing screws of hole A and hole B to remove the slide rail from the positioner.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention provides a device and method for calibrating a 3582 positioner in a nuclear power plant, which has a simple structure, is easy to use, and has low cost;

[0024] (2) The device and method for adjusting the 3582 positioner of a nuclear power plant provided by the present invention can greatly reduce the number of times the nozzle fastening bolts are loosened and fastened, thereby increasing the service life of the nozzle fastening bolts;

[0025] (3) The present invention provides a device and a method for adjusting the 3582 positioner in a nuclear power plant, which can effectively solve the problem of loose tightening of the nozzle fixing bolts;

[0026] (4) The device and method for adjusting the 3582 positioner in a nuclear power plant provided by the present invention can greatly reduce the maintenance time of the valve positioner by maintenance personnel, thereby greatly reducing the risk of personal injury caused by radiation dose;

[0027] (5) The present invention provides a device and method for adjusting the 3582 positioner of a nuclear power plant, which fully utilizes the structure of the positioner itself, is efficient and easy to use, and avoids the tedious process of repeated adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the internal control components of the 3582 positioner in a nuclear power plant

[0029] Figure 2 A schematic diagram of the structure of a device for calibrating a 3582 positioner in a nuclear power plant provided by the present invention

[0030] In the figure: 1. A hole; 2. B hole; 3. Nozzle fastening bolt; 4. Nozzle; 5. A hole fixing screw; 6. B hole fixing screw; 7. Butterfly locking nut; 8. Slide rail; 9. 10mm special thin wrench. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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.

[0034] According to the internal structure diagram of 3582, the nozzle and the nozzle fastening bolts are in the "concave" position in the positioner. Due to structural reasons, "follow-rotation phenomenon" will occur in the process of tightening the nozzle fastening bolts. Therefore, repeated adjustments and loosening of the fastening often occur during normal positioner maintenance. This not only shortens the service life of the nozzle fastening bolts, but also greatly increases the unnecessary maintenance time of maintenance personnel. In addition, the nozzle is easily not tightened firmly, resulting in valve zero drift and even shutdown of the reactor.

[0035] like Figure 1 As shown, according to the internal structure diagram of 3582, the nozzle and the nozzle fastening bolts are in the "concave" position in the positioner. Due to structural reasons, "follow-up phenomenon" will occur in the process of tightening the nozzle fastening bolts. Therefore, repeated adjustments and loosening of the fastening often occur during normal positioner maintenance, which not only shortens the service life of the nozzle fastening bolts but also greatly increases the unnecessary maintenance time of maintenance personnel. In addition, the nozzle is easily loosely fastened, resulting in valve zero drift and even shutdown of the reactor.

[0036] like Figure 2 As shown, the present invention provides a device for adjusting the 3582 positioner of a nuclear power plant, comprising: an A-hole fixing screw 5, a B-hole fixing screw 6, a butterfly locking nut 7, a slide rail 8, and a 10mm special thin wrench 9.

[0037] The slide rail 8 is fixed on the 3582 positioner by means of the A hole fixing screw 5 and the B hole fixing screw 6. The A hole fixing screw 5 is installed in the A hole 1, and the B hole fixing screw 6 is installed in the B hole 2. A through hole is provided on the 10mm special thin wrench 9. The through hole is connected to the slide rail 8 by means of a butterfly locking nut 7. The other end of the 10mm special thin wrench 9 is connected to the nozzle 4.

[0038] The present invention provides a method for using a device for calibrating a 3582 positioner in a nuclear power plant, comprising the following steps:

[0039] Step 1. Use the A hole fixing screw 5 and the B hole fixing screw 6 to fix the slide rail 8 in the A hole 1 and the B hole 2 of the positioner;

[0040] Step 2, loosen the butterfly lock nut 7 on the slide rail 8, and adjust the angle of the 10mm special thin spanner 9 appropriately through the slide rail;

[0041] Step 3, after aligning the 10mm special thin wrench 9 with the nozzle 4, tighten the butterfly locking nut 7 on the slide rail 8 to ensure that the nozzle 4 is firmly fixed;

[0042] Step 4. Use a 13mm thin wrench to tighten the nozzle fastening bolts;

[0043] Step 5, loosen the butterfly locking nut 7 on the slide rail 8;

[0044] Step 6, remove the 10mm special thin wrench 9;

[0045] Step 7. Loosen the fixing screws 5 of hole A and the fixing screws 6 of hole B to remove the slide rail 8 from the positioner.

[0046] Combine the following Figure 1 and Figure 2 The following is an explanation of the working principle of a special device for adjusting the 3582 positioner in a nuclear power plant: first, the special slide rail 8 is fixed through the positioning hole of the positioner itself. After the special thin wrench 9 is adjusted according to the position of the nozzle 4, the special thin wrench 9 and the slide rail 8 are fixed by the butterfly nuts 7 in the two slide rails. The nozzle 4 is stably fixed. In this way, when tightening the nozzle fastening bolts, the nozzle will not "follow the rotation phenomenon" to ensure that the adjusted nozzle position is not changed, which fundamentally reduces the number of repeated tightening and loosening of the nozzle fastening bolts, indirectly increases the service life of the nozzle fastening bolts, and greatly reduces unnecessary maintenance time for maintenance personnel, avoiding the occurrence of loose nozzle fastening causing valve zero point drift and even shutdown of the reactor.

[0047] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for using a device for adjusting a 3582 positioner in a nuclear power plant, based on a device for adjusting a 3582 positioner in a nuclear power plant, comprising an A hole fixing screw (5), a B hole fixing screw (6), a butterfly locking nut (7), a slide rail (8), and a 10 mm special thin wrench (9), wherein the 10 mm special thin wrench (9) is slidably connected to the slide rail (8), and the other end of the 10 mm special thin wrench (9) is connected to the nozzle (4); the slide rail (8) is provided with a screw thread that cooperates with the A hole (1) and the B hole (2). The slide rail (8) is fixed to the 3582 positioner by means of the A hole fixing screw (5) and the B hole fixing screw (6); the A hole fixing screw (5) is installed in the A hole (1), and the B hole fixing screw (6) is installed in the B hole (2); the 10 mm special thin wrench (9) is provided with a through hole; the through hole and the slide rail (8) are connected by means of a butterfly locking nut (7); the 10 mm special thin wrench (9) slides in the slide rail (8) and is tightened by means of the butterfly locking nut (7); the characteristics are: The steps include: Step (1), use the A hole fixing screw (5) and the B hole fixing screw (6) to fix the slide rail (8) in the A hole (1) and the B hole (2) of the positioner; Step (2), loosen the butterfly lock nut (7) on the slide rail (8), and adjust the angle of the 10 mm special thin wrench (9) appropriately through the slide rail; Step (3), after aligning the 10 mm special thin wrench (9) with the nozzle (4), tighten the butterfly locking nut (7) on the slide rail (8) to ensure that the nozzle (4) is firmly fixed; Step (4), use a 13mm thin wrench to tighten the nozzle fastening bolt; Step (5), loosen the butterfly lock nut (7) on the slide rail (8); Step (6), remove the 10 mm special thin wrench (9); Step (7), loosen the A hole fixing screw (5) and the B hole fixing screw (6) and remove the slide rail (8) from the positioner.

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