A locking device for a hydraulic control butterfly valve of a VVER nuclear power plant

Abstract

The present invention belongs to the technical field of nuclear power plant valve locking, and specifically discloses a device for ensuring reliable locking of a hydraulic control butterfly valve in a VVER nuclear power plant. The device includes a locking bushing, a locking shaft retaining rod with one end installed in the axial hole of the locking bushing, a spring guide with one end located inside the other end of the locking shaft retaining rod, a spring sleeved outside the spring guide and located inside the locking shaft retaining rod, the spring being located between the locking shaft retaining rod and the spring guide, a spring base for locking the locking shaft retaining rod and the spring guide, a position indicator sleeved outside the middle of the locking shaft retaining rod, a locking shaft penetrating the radial direction of the locking bushing, and fixing brackets installed at both ends of the locking shaft. After the device of the present invention is installed, the locking of the hydraulic control butterfly valve can be reliably achieved, effectively ensuring the safety of personnel and equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power plant valve locking, and particularly relates to a device for ensuring reliable locking of a hydraulically controlled butterfly valve in a VVER nuclear power plant. Background Art

[0002] The seawater circulating cooling water system of a nuclear power plant unit is equipped with a hydraulically controlled butterfly valve. The main function of the hydraulically controlled butterfly valve is to provide seawater cooling water to downstream users (mainly condensers). This equipment makes a significant contribution to the power increase and decrease of the unit as well as unit shutdown. The hydraulically controlled butterfly valve is controlled by a hydraulic oil station. The opening and closing power source of the butterfly valve comes from the accumulator of the oil pressure station. The accumulator realizes the opening and closing operations of the butterfly valve through a piston cylinder and a fork box connected to the downstream of the butterfly valve, so as to realize the interlocking opening and closing of the butterfly valve with the circulating water pump.

[0003] During major repairs, in accordance with the major repair cycle management, it is necessary to carry out inspection and maintenance work on the circulating water pump in front of the hydraulically controlled butterfly valve, the butterfly valve body, the connecting pipeline between the butterfly valves and other equipment according to the maintenance cycle.

[0004] In addition, if the circulating water pump is repaired without shutting down the unit due to a circulating water pump failure, in order to prevent the circulating water pump from reversing, it is necessary to isolate the circulating water pump separately. During this period, the hydraulically controlled butterfly valve corresponding to the outlet of the circulating water pump must be stably and reliably maintained in the closed position. After the valve is closed in place, misoperation by personnel or accidental contact with equipment in the oil pressure station on site may cause the valve to open, resulting in equipment damage and possibly endangering personnel safety.

[0005] In view of the above situation, it is necessary to ensure that the hydraulically controlled butterfly valve is in a reliable closed position when work is required. The hydraulically controlled butterfly valve has a large diameter, and the butterfly plate has a large force-bearing area in the closed position, and the valve shaft bears a large reverse force, which poses a great threat to ensuring the closed position of the valve. And tiny leakage may cause a large amount of seawater to pour into the downstream of the valve or from the adjacent pipeline into the upstream of the valve. There is a great risk of drowning for personnel to carry out maintenance work inside the pipeline. At the same time, if there are equipment openings at other positions in this system, there may also be a risk of flooding the plant where the opening is located. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: aiming at the technical problem that the hydraulically controlled butterfly valve in the prior art maintains the closed position during the period when reliable closing is required, a locking device for the hydraulically controlled butterfly valve in a VVER nuclear power plant is provided. This device can reliably lock the hydraulically controlled butterfly valve and effectively ensure the safety of personnel and equipment.

[0007] Technical solution for achieving the object of the present invention: A hydraulic control butterfly valve locking device for a VVER nuclear power plant, the device includes a locking bushing, a locking shaft holding rod with one end installed in the axial hole of the locking bushing, a spring guide with one end located inside the other end of the locking shaft holding rod, a spring sleeved outside the spring guide and located inside the locking shaft holding rod, the spring is located between the locking shaft holding rod and the spring guide, a spring base for locking the locking shaft holding rod and the spring guide, a position indicator sleeved outside the middle of the locking shaft holding rod, a locking shaft penetrating the radial direction of the locking bushing, and fixing brackets installed at both ends of the locking shaft.

[0008] The axis of the spring guide coincides with the axes of the locking bushing and the locking shaft holding rod, the axis of the spring guide is perpendicular to the axis of the position indicator, and the axis of the locking shaft is perpendicular to the axes of the spring guide and the position indicator respectively.

[0009] The locking bushing is axially provided with an axial hole for installing the locking shaft holding rod, the locking bushing is radially provided with a through hole for installing the locking shaft, the locking bushing is circumferentially provided with a plurality of keys for the key grooves of the valve shaft of the hydraulic control butterfly valve, the locking bushing is circumferentially provided with a plurality of bolt holes for installing the spring guide, and the keys and the bolt holes are evenly spaced.

[0010] The other end of the locking shaft holding rod is of an open structure.

[0011] The spring guide is a T-shaped spring guide, and the spring guide is composed of a guide cross bar and a guide vertical bar.

[0012] The guide cross bar of the spring guide is located inside the open structure of the locking shaft holding rod.

[0013] The spring is sleeved outside the guide vertical bar of the spring guide.

[0014] The spring base is installed at the end of the open structure of the locking shaft holding rod.

[0015] The fixed locking shaft and the fixing brackets form a fixing bracket set, and both ends of the locking shaft are respectively inserted into the bolt holes of the two fixing brackets.

[0016] Both ends of the fastening locking shaft and the two fixing brackets are respectively fixedly connected by nuts.

[0017] The beneficial technical effects of the present invention are as follows: The hydraulic control butterfly valve locking device of the present invention can achieve online and offline installation, and does not change the valve position of the hydraulic control butterfly valve during installation; keeps the hydraulic control butterfly valve in a reliable closed position; during the locking of the hydraulic control butterfly valve, the current state of the valve is not lost, and the main control can obtain the position information of the valve in real time.

[0018] [1] The locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention is convenient and fast to install. Only the indicator cover and some bolts need to be removed for installation.

[0019] [2] The spring self-adjusting locking rod adjusting mechanism of the locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention can effectively ensure the retention effect of the locking rod bushing.

[0020] [3] The locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention has an adjustable position indication function. During locking, the current valve position is not lost, and it can feedback signals to the main control room.

[0021] [4] The locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention does not change the valve state during installation and can be installed online or offline.

[0022] [5] The locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention can achieve reliable locking in the closed position through the adjustment of the locking bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a front view schematic diagram of the locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention;

[0024] Figure 2 is a side view schematic diagram of the locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention;

[0025] Figure 3 is a front view schematic diagram of the locking bushing of the locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention;

[0026] Figure 4 is Figure 3 the side view schematic diagram of the locking bushing in

[0027] Figure 5 is a front view schematic diagram of the locking shaft retaining rod of the locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention;

[0028] Figure 6 is Figure 5 the side view schematic diagram of the locking shaft retaining rod in

[0029] Figure 7 is a front view schematic diagram of the spring base of the locking device for the hydraulic control butterfly valve of a VVER nuclear power plant provided by the present invention;

[0030] Figure 8 is Figure 7 the side view schematic diagram of the spring base in Figure 9The front view schematic diagram of the spring guide of a hydraulic control butterfly valve locking device for a VVER nuclear power plant provided by the present invention;

[0031] Figure 10 For Figure 9 The side view schematic diagram of the spring guide in

[0032] Figure 11 The front view schematic diagram of the locking shaft of a hydraulic control butterfly valve locking device for a VVER nuclear power plant provided by the present invention;

[0033] Figure 12 For Figure 11 The side view schematic diagram of the locking shaft in

[0034] Figure 13 The front view schematic diagram of the locking shaft of a hydraulic control butterfly valve locking device for a VVER nuclear power plant provided by the present invention;

[0035] Figure 14 The front view schematic diagram of the position indicator of a hydraulic control butterfly valve locking device for a VVER nuclear power plant provided by the present invention;

[0036] Figure 15 For Figure 14 The side view schematic diagram of the position indicator in

[0037] Figure 16 For Figure 14 The top view schematic diagram of the position indicator in . In the figure: 1 - locking shaft sleeve, 2 - locking shaft retaining rod, 3 - spring base, 4 - spring guide, 5 - fixing bracket, 6 - locking shaft, 7 - position indicator, 8 - spring, 9 - nut. Specific embodiments

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] As Figure 1 And Figure 2 Shown, a hydraulic control butterfly valve locking device for a VVER nuclear power plant provided by the present invention, the device includes a locking shaft sleeve 1, a locking shaft retaining rod 2, a spring base 3, a spring guide 4, a fixing bracket 5, a locking shaft 6, a position indicator 7, a spring 8 and a nut 9.

[0040] As Figure 1 , Figure 2 , Figure 3 And Figure 4As shown, the locking bushing 1 is a bushing device with four keys. The inner part of the locking bushing 1 in the axial direction is hollow-designed. Four keys A are evenly arranged circumferentially on the locking bushing 1. The four keys A are symmetrically arranged. There are through holes B on both the upper and lower sides of the locking bushing 1 in the radial direction. The through holes B can adjust the front and rear positions, and are used for the installation and fixation of the locking shaft 6 and thus lock the valve shaft of the hydraulic control butterfly valve. Four bolt holes C are evenly arranged circumferentially on the locking bushing 1 for installing the spring guide 4; the four bolt holes 1C are evenly spaced from the four keys A.

[0041] As Figure 1 , Figure 5 and Figure 6 shown, the appearance shape of the locking shaft retaining rod 2 is a cylindrical component. Its function is to maintain the positions of the locking bushing 1 and the locking shaft 6 and prevent the axial position of the locking bushing 1 from shifting. One end of the locking shaft retaining rod 2 is an open structure D for installing the spring base 3. The locking shaft retaining rod 2 cooperates with the spring 8 to lock the locking bushing 1 and the locking shaft 6.

[0042] As Figure 1 , Figure 9 , Figure 10 and Figure 5 shown, the spring guide 4 is a T-shaped spring guide. The spring guide 4 is composed of a guide cross bar E and a guide vertical bar F. The guide cross bar E of the spring guide 4 is installed in the open structure D of the locking shaft retaining rod 2. At the same time, the middle two threaded holes G on the guide cross bar E of the spring guide 4 are used for installing and fixing the position indicator 7.

[0043] As Figure 2 , Figure 11 , Figure 12 and Figure 13 shown, the fixing frame set includes two fixing frames 5 and the fixed locking shaft 6. The fixing frame 5 is used to fix the locking shaft 6. The two ends of the locking shaft 6 are respectively inserted into the bolt holes H of the two fixing frames 5. Two nuts 9 are respectively sleeved on the two ends of the locking shaft 6. The two nuts 9 respectively fasten the two fixing frames 5 and the locking shaft 6. The bolt holes H of the fixing frame 5 are adjustable.

[0044] As Figure 1 , Figure 14 , Figure 15 and Figure 16 shown, the disk hole L of the fixed position indicator 7 is sleeved outside the locking shaft retaining rod 2. The position indicator 7 is fixed on the two threaded holes G of the guide cross bar E of the spring guide 4, and can realize the indication of the on-site mechanical valve position. At the same time, by adjusting the position indicator 7, the current closed position signal of the valve can be fed back to the main control room.

[0045] The axis of the spring guide 4 coincides with the axes of the locking bushing 1 and the locking shaft retaining rod 2. The axis of the spring guide 4 is perpendicular to the axis of the position indicator 7. The axis of the locking shaft 6 is perpendicular to the axes of the spring guide 4 and the position indicator 7 respectively.

[0046] As Figure 1 shown, the spring 8 is sleeved outside the guide vertical rod F of the spring guide 4. The spring 8 is located between the spring guide 4 and the locking shaft retaining rod 2. Under the action of the spring 8, the locking shaft retaining rod 2 and the locking bushing 1 can be kept in the current position.

[0047] As Figure 1 、 Figure 7 and Figure 8 shown, the spring base 3 is installed at the end of the open structure D of the locking shaft retaining rod 2. The two are fixed by set screws, and the spring 8 is restricted between the spring guide 4 and the locking bushing 2.

[0048] As Figure 1 and Figure 2 shown, the installation steps of a locking device for a hydraulic control butterfly valve in a VVER nuclear power plant provided by the present invention are as follows:

[0049] Before installation, check that all components are in good condition, without cracks, burrs, deformation, or damage. All thread positions have intact threads, and the surfaces of the components are smooth.

[0050] Step 1: After confirming that the hydraulic control butterfly valve is in the closed position, remove the position indicator end cover at the fork box of the hydraulic control butterfly valve to expose the valve shaft of the hydraulic control butterfly valve.

[0051] Step 2: Insert the key A of the locking bushing 1 into the valve shaft of the hydraulic control butterfly valve in the direction of the keyway of the valve shaft of the hydraulic control butterfly valve and ensure that the key A is in full contact with the keyway. Rotate the locking bushing 1 to confirm that the locking bushing 1 fits well with the valve shaft of the hydraulic control butterfly valve.

[0052] Step 3: Slowly place the locking shaft retaining rod 2 into the central hole of the locking bushing 1 to prevent the locking shaft retaining rod 2 from falling off.

[0053] Step 4: After comparing the installation position of the fixing bracket 5, remove the fastening bolts of the fixing bracket 5 corresponding to the top and bottom of the fork box of the hydraulic control butterfly valve.

[0054] Step 5: Install the fixing bracket 5 onto the fork box of the hydraulic control butterfly valve and initially tighten and position it.

[0055] Step 6: Install the locking shaft 6. The locking shaft 6 passes through the bolt hole H of the fixing bracket 5, the through hole B of the locking bushing 1, and the radial hole of the locking shaft retaining rod 2 in sequence, and screw the nut 9 onto the locking shaft 6 to initially fix the locking shaft 6 and the fixing bracket 5.

[0056] Step 7: Install the spring guide 4 into the open structure D of the locking retaining rod 2 and fasten it with bolts.

[0057] Step Eight: Slip spring 8 over the guide vertical rod F of spring guide 4 and install spring 8 between spring guide 4 and the latch shaft holding rod 2;

[0058] Step Nine: Install spring base 3 at the end of the open structure D of the latch shaft holding rod 2 to keep spring 8 in a compressed state, and lock spring base 3 to the latch shaft holding rod 2 using a setscrew;

[0059] Step Ten: Install position indicator 7. Slip the hollow disk L of position indicator 7 over the outer part of the closed end of the latch shaft holding rod 2 without making any adjustments for the time being;

[0060] Step Eleven: Adjust fixing bracket 5 to lock latch shaft 6 to the latch shaft sleeve 1, and tighten the fixing bolts of fixing bracket 5 and the latch shaft nut 9;

[0061] Step Twelve: Adjust position indicator 7 to fix position indicator 7 to spring base 3 after position indicator 7 touches the liquid-controlled butterfly valve limit switch;

[0062] Step Twelve: Verify that all devices on site cooperate well, and the current closed position signal of the valve can be fed back to the main control room by adjusting position indicator 7.

[0063] The present invention realizes the locking of the liquid-controlled butterfly valve by using the fork box at the valve shaft position of the liquid-controlled butterfly valve and the keyways inside the valve shaft. After the liquid-controlled butterfly valve is closed in place, the four keyways distributed inside the valve shaft of the liquid-controlled butterfly valve are symmetrically distributed at 90 degrees up, down, left, and right. Locking the liquid-controlled butterfly valve actually means locking the valve shaft of the liquid-controlled butterfly valve. Part of the valve shaft of the liquid-controlled butterfly valve is located inside the fork box, and the valve shaft at the fork box position is actually a shaft sleeve with 4 keyways. An open position feedback switch and a closed position feedback switch are installed on the fork box panel, which are used to feedback the state of the liquid-controlled butterfly valve and transmit the signal to the main control room. At the same time, an opening indicator plate is installed on the panel, and the specific valve position opening of the valve can be confirmed locally through the mechanical position indicator.

[0064] The above has described the present invention in detail with reference to the drawings and embodiments. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention. The content not described in detail in the present invention can all adopt the prior art.

Claims

1. A locking device for a hydraulic control butterfly valve in a VVER nuclear power plant, characterized in that: The device includes a locking shaft sleeve (1), a locking shaft retaining rod (2) with one end installed in the axial hole of the locking shaft sleeve (1), a spring guide (4) with one end located inside the other end of the locking shaft retaining rod (2), a spring (8) sleeved outside the spring guide (4) and located inside the locking shaft retaining rod (2), the spring (8) being located between the locking shaft retaining rod (2) and the spring guide (4), a spring base (3) for locking the locking shaft retaining rod (2) and the spring guide (4), a position indicator (7) sleeved outside the middle of the locking shaft retaining rod (2), a locking shaft (6) penetrating the radial direction of the locking shaft sleeve (1), and fixing brackets (5) installed at both ends of the locking shaft (6); the fixing brackets (5) are installed on the fork box of the hydraulic control butterfly valve and fixed in position; the locking shaft (6) sequentially passes through the bolt holes (H) of the fixing brackets (5), the through holes (B) of the locking shaft sleeve (1), and the radial holes of the locking shaft retaining rod (2), and a nut (9) is screwed onto the locking shaft (6) to fix the locking shaft (6) and the fixing brackets (5); the axis of the spring guide (4) coincides with the axes of the locking shaft sleeve (1) and the locking shaft retaining rod (2), the axis of the spring guide (4) is perpendicular to the axis of the position indicator (7), and the axis of the locking shaft (6) is perpendicular to the axes of the spring guide (4) and the position indicator (7) respectively; the locking shaft sleeve (1) is axially provided with an axial hole for installing the locking shaft retaining rod (2), the locking shaft sleeve (1) is radially provided with a through hole (B) for installing the locking shaft (6), the locking shaft sleeve (1) is circumferentially and evenly provided with a number of keys (A) for the keyway of the valve shaft of the hydraulic control butterfly valve, the locking shaft sleeve (1) is circumferentially and evenly provided with a number of bolt holes (C) for installing the spring guide (4), and the keys (A) and the bolt holes (C) are evenly spaced.

2. A hydraulic control butterfly valve locking device for a VVER nuclear power plant according to claim 1, characterized in that: The other end of the locking shaft retaining rod (2) is an open structure (D).

3. The latching device of the hydraulic control butterfly valve for a VVER nuclear power plant according to claim 2, wherein: The spring guide (4) is a T-shaped spring guide, and the spring guide (4) consists of a guide cross bar (E) and a guide vertical bar (F).

4. A hydraulic control butterfly valve locking device for a VVER nuclear power plant according to claim 3, characterized in that: The guide cross bar (E) of the spring guide (4) is located inside the open structure (D) of the locking shaft retaining rod (2).

5. A hydraulic control butterfly valve locking device for a VVER nuclear power plant according to claim 4, characterized in that: The spring (8) is sleeved outside the guide vertical bar (F) of the spring guide (4).

6. The latching device for the hydraulic control butterfly valve of a VVER nuclear power plant according to claim 5, characterized in that: The spring base (3) is installed at the end of the open structure (D) of the locking shaft retaining rod (2).

7. A hydraulic control butterfly valve locking device for a VVER nuclear power plant according to claim 6, characterized in that: The locking shaft (6) and the fixing brackets (5) are fixed to form a fixing bracket set, and both ends of the locking shaft (6) are respectively inserted into the bolt holes (H) of the two fixing brackets (5).

8. A hydraulic control butterfly valve locking device for a VVER nuclear power plant according to claim 7, characterized in that: The two ends of the locking shaft (6) and the two fixing brackets (5) are tightly fixed and connected through nuts (9).

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