Disassembling and assembling tool for valve seat of vacuum breaking valve of condenser water chamber

Abstract

The utility model provides a condenser water chamber vacuum breaker valve seat dismounting tool which comprises a sleeve head and a flange, the sleeve head is provided with a rotating spline, the center of the rotating spline is provided with a transmission shaft, the top of the transmission shaft is provided with a hexagonal sleeve head, the rotating spline is provided with a protrusion, and the flange is provided with a flange. The flange is provided with an inner hole, the transmission shaft is sleeved with the flange through the inner hole, and four flange bolt holes which are evenly distributed in the circumferential direction are formed in the flange. The special tool can meet the requirement for disassembly and assembly of the valve seat in field actual work, meanwhile, the overhaul efficiency can be guaranteed, the overhaul quality is 100% qualified after equipment is overhauled and put into operation, and meanwhile due to the convenience of the special tool, the overhaul time is greatly shortened, and the dosage received by workers is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of disassembly and assembly of a valve seat of a condenser water chamber vacuum breaking valve, in particular to a disassembly and assembly tool of a valve seat of a condenser water chamber vacuum breaking valve. Background Art

[0002] The condenser circulating cooling water system of a heavy water reactor nuclear power plant is an important secondary circuit system of the nuclear power plant. The condenser water chamber vacuum breaking valve can automatically open when the negative pressure or vacuum gradually increases in the condenser or its connected pipeline due to system operation or shutdown, thereby destroying the vacuum effect and preventing the pipeline and other equipment from being deflated or cracked, thereby protecting the safety of the equipment.

[0003] The vacuum breaker valve of the condenser circulating cooling water system is manufactured by Hitachi, Japan. Since the valve is located in the steam turbine plant and is in an important position in the system, the quality of its maintenance affects the safe and stable operation of the entire unit. The connection between the valve seat and the valve body of the vacuum breaker valve is a threaded connection, and the tightening torque of the valve seat is large, so general tools cannot be used to disassemble and assemble the valve seat. Utility Model Content

[0004] The utility model aims to provide a condenser water chamber vacuum breaking valve seat disassembly and assembly tool to solve the problem that the condenser water chamber vacuum breaking valve seat can not be disassembled and assembled by common tools.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A condenser water chamber vacuum breaker valve seat disassembly and assembly tool comprises a sleeve head and a flange, wherein the sleeve head has a rotating spline, a transmission shaft is provided at the center of the rotating spline, a hexagonal sleeve head is provided on the top of the transmission shaft, a protrusion is provided on the rotating spline, the flange has an inner hole and the flange is sleeved on the transmission shaft through the inner hole, and the flange is provided with 4 flange bolt holes evenly arranged circumferentially.

[0007] As an practicable manner, the diameter of the rotating spline is 122 mm.

[0008] As an practicable manner, the thickness of the rotating spline is 10 mm.

[0009] As an practicable manner, the height of the protrusion is 10 mm and the width is 10 mm.

[0010] As an practicable manner, the number of the protrusions is 4, and the bottoms of the rotating splines are evenly arranged circumferentially.

[0011] As an implementable manner, the distance between opposite sides of the hexagonal socket head is 33 mm, the thickness is 40 mm, and the height is 26 mm.

[0012] As an implementable manner, the height of the transmission shaft is 128 mm.

[0013] As an implementable manner, the diameter of the flange is 213 mm.

[0014] As an implementable manner, the diameter of the flange bolt hole is 20 mm.

[0015] As an implementable manner, the diameter of the inner hole is 40 mm.

[0016] Compared with the prior art, the valve seat disassembly and assembly tool for the condenser water chamber vacuum breaker provided by the present utility model has the following beneficial effects:

[0017] The present utility model is used for the most critical link in valve maintenance: the smooth disassembly and assembly of the valve seat. Since the valve seat and the valve body are threadedly connected and the torque value is large, it is impossible to effectively straighten the socket head by manpower alone. If the socket head is skewed, the valve seat will not only not obtain the due torque value, but even damage the valve seat thread. Therefore, a special flange is made according to the size of the middle flange and the inner diameter of the valve body, which plays two key roles: the first is to completely eliminate the gap between the socket head and the inner wall of the valve, and the second is to provide circumferential guidance for the socket head through the cooperation of the special flange and the valve body.

[0018] The present utility model can meet the requirements of valve seat disassembly and assembly in actual on-site work, and at the same time can ensure the maintenance efficiency. After the equipment is overhauled and put into operation, the overhaul quality is 100% qualified. At the same time, due to the convenience of the special tool, the overhaul time is greatly shortened, and the dose received by the staff is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for the technical description will be briefly introduced below.

[0020] Figure 1 It is a schematic structural view of the valve seat disassembly and assembly tool for the condenser water chamber vacuum breaker provided by the present utility model;

[0021] Figure 2 It is a front view of the socket head provided by the present utility model;

[0022] Figure 3 It is a left view of the socket head provided by the present utility model;

[0023] Figure 4 It is a front view of the flange provided by the present utility model;

[0024] Figure 5A cross-sectional view of the flange provided by the present utility model.

[0025] Explanation of reference numerals:

[0026] 1. Rotating spline; 2. Flange; 3. Flange bolt hole; 4. Socket head; 5. Protrusion; 6. Transmission shaft; 7. Hexagonal socket head. Specific embodiments

[0027] The following is a further detailed description through specific embodiments.

[0028] As Figures 1 to 4 shown, the present utility model provides a disassembling and assembling tool for the valve seat of a condenser water chamber vacuum breaker, including a socket head 4 and a flange 2. The disassembling and assembling tool consists of two mechanical modules. The socket head 4 and the flange 2 are applicable to the valve seat and the middle flange specifications of the vacuum breaker. The flange 2 is a special flange, which can cooperate with the middle flange of the valve body and meet the requirements of comprehensive strength and lightness.

[0029] According to the structural dimensions of the four pits around the valve seat, a matching socket head 4 is designed. The socket head 4 includes a rotating spline 1 at the bottom, a transmission shaft 6 arranged on the rotating spline 1, and a hexagonal socket head 7 arranged at the top of the transmission shaft 6. As Figure 1 and Figure 2 shown, the bottom of the socket head 4 is a circular rotating spline 1. The rotating spline 1 is an overall flat cylinder, and the diameter d1 of the rotating spline 1 is 122 mm. A protrusion 5 is provided at the bottom of the rotating spline 1. The width of the protrusion 5 is 10 mm, the depth (height) is 10 mm, and the number of protrusions 5 is 4, which are evenly arranged circumferentially. The 4 protrusions 5 are 4 keys along the circumferential direction of the end face, and are male-female matched with the upper end of the valve seat. The upper end of the socket head 4 is a hexagonal socket head 7 with a distance between opposite sides a of 33 mm and a thickness b of 40 mm to cooperate with a torque wrench. The height c of the hexagonal socket head 7 is 26 mm. The diameter of the transmission shaft 6 is 26 mm.

[0030] According to the structural dimensions of the middle flange of the valve, 4 flange bolt holes 3 are evenly distributed on the flange 2. The center distance of the flange bolt holes is 90 mm to cooperate with the middle flange of the valve, and the inner hole diameter d5 is 40 mm to fix the socket head 4 to achieve circumferential guiding and fixing. As Figure 3 and Figure 4 shown, the diameter d2 of the flange 2 is 213 mm, the diameter d3 of the flange bolt hole 3 is 20 mm, and the diameter d4 of the circular surface where the 4 flange bolt holes are located is 180 mm. The thickness d6 of the flange 2 is 20 mm.

[0031] The overall height of the disassembly and assembly tool is 174 mm to adapt to the height of the valve body. Among them, the overall height of the transmission shaft 6 of the socket head 4 is 128 mm, the height of the hexagonal socket head 7 at the top of the transmission shaft 6 is 26 mm, the height (thickness) of the transmission spline 1 is 10 mm, and the height of the protrusion 5 at the bottom of the transmission spline 1 is 10 mm.

[0032] The assembly structure of the whole set of devices is that the flange 2 is connected to the socket head 4. After the valve actuator and the middle flange bolts are removed, the whole set of devices is tightly connected by the middle flange connecting bolts passing through the flange bolt holes to fasten the flange 2 and the valve body flange. A conventional socket head is installed at the upper end of the special socket head 4, and a conversion head is used in cooperation and connected to a torque wrench to realize the effective disassembly and assembly of the valve seat.

[0033] The utility model can ensure that the socket head does not deflect under a large torque during the disassembly and assembly of the valve seat, so that the valve seat is evenly stressed, avoiding damage to the valve seat thread, protecting the safety of the equipment, and also preventing the torque wrench from slipping and hurting the staff and accidentally touching the equipment, ensuring the safety of personnel and equipment. At the same time, the design and manufacture of the special tool for valve seat disassembly and assembly bring convenience to the maintenance of other types of valves of this model, making the work safe and reliable; secondly, it ensures convenient and efficient work: when the maintenance personnel perform torque tightening, they only need to hold the torque wrench without considering the deflection problem, and it is easier to evenly tighten the valve seat to the required torque, which can effectively improve work efficiency and reduce personnel dose exposure; finally, the tool is designed to be light and small, not restricted by the on-site space environment, ensuring its convenience of use.

[0034] The above is only the specific implementation manner of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the utility model should be covered by the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claimed rights.

Claims

1. A condenser water chamber vacuum breaking valve seat disassembly and assembly tool, characterized in that: The invention comprises a sleeve head (4) and a flange (2), wherein the sleeve head (4) has a rotating spline (1), a transmission shaft (6) is provided at the center of the rotating spline (1), a hexagonal sleeve head (7) is provided at the top of the transmission shaft (6), a protrusion (5) is provided on the rotating spline (1), the flange (2) has an inner hole and the flange (2) is sleeved on the transmission shaft (6) through the inner hole, and the flange (2) is provided with four flange bolt holes (8) evenly arranged in the circumferential direction.

2. The condenser water chamber vacuum breaker valve seat disassembly and assembly tool according to claim 1, characterized in that: The diameter of the rotating spline (1) is 122 mm.

3. The condenser water chamber vacuum breaking valve seat disassembly and assembly tool according to claim 1, characterized in that: The thickness of the rotating spline (1) is 10 mm.

4. The condenser water chamber vacuum breaker valve seat disassembly and assembly tool according to claim 1, characterized in that: The protrusion (5) has a height of 10 mm and a width of 10 mm.

5. The condenser water chamber vacuum breaker valve seat disassembly and assembly tool according to claim 1, characterized in that: The number of the protrusions (5) is 4, and they are evenly arranged circumferentially at the bottom of the rotating spline (1).

6. The condenser water chamber vacuum breaker valve seat disassembly and assembly tool according to claim 1, characterized in that: The hexagonal sleeve head (7) has a width across flats of 33 mm, a thickness of 40 mm and a height of 26 mm.

7. The condenser water chamber vacuum breaker valve seat disassembly and assembly tool according to claim 1, characterized in that: The height of the transmission shaft (6) is 128 mm.

8. The condenser water chamber vacuum breaker valve seat disassembly and assembly tool according to claim 1, characterized in that: The diameter of the flange (2) is 213 mm.

9. The condenser water chamber vacuum breaker valve seat disassembly and assembly tool according to claim 1, characterized in that: The diameter of the flange bolt hole (8) is 20 mm.

10. The condenser water chamber vacuum breaker valve seat disassembly and assembly tool according to claim 1, characterized in that: The diameter of the inner hole is 40 mm.

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