Special tool for positioning mechanical seal of main pump of nuclear power station

Abstract

The utility model particularly provides a special tool for mechanical seal positioning of a main pump of a nuclear power station, which comprises a positioning rod and a sliding block support, the positioning rod comprises a positioning rod A and a positioning rod B which are fixed at the top of a support rod through a connecting frame and are used for positioning a three-stage sealing shell and a sealing chamber; the sliding block support is fixed to the bottom of the supporting rod, can clamp a secondary shaft sleeve and is used for fixing the position of the whole device. Through the cooperation of the positioning rod and the sliding block support, positioning of upper and lower mechanical seals can be achieved at a time, operation is easy and convenient, accuracy is high, the dislocation problem can be effectively prevented, reworking during working is avoided, the risk of accidental irradiation of personnel is reduced, and the collective dosage is reduced; meanwhile, a detachable structure is adopted, the overall size is small, operation can be conducted by a single person entering the pump cavity, and operation is easy, convenient and rapid.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant rotating equipment maintenance engineering, in particular to a special tool for positioning the mechanical seal of a main pump of a nuclear power plant. Background Art

[0002] During the installation and commissioning of the main pumps of units 5 and 6, there were multiple leakage problems in the third-stage mechanical seals of the main pumps. During the overhaul, only the third-stage seal needed to be disassembled. Since the third-stage mechanical seal has matching points with the upper part of the second-stage mechanical seal and the lower part of the shutdown seal, very accurate positioning is required during the reinstallation of the third-stage mechanical seal after overhaul.

[0003] The current practice is to mark the special tool plate for fixing the dynamic and static rings of the mechanical seal before taking out the third-stage mechanical seal, and then reinstall it according to the mark. Since the reinstallation positioning requirements of the main pump mechanical seal are extremely high, the reinstallation method based on the mark often cannot meet the device's requirements for accuracy, which can easily cause misalignment and prevent the mechanical seal from falling as a whole, resulting in repeated disassembly and assembly, which ultimately affects the maintenance period and may also increase the risk of accidental exposure to personnel. Summary of the invention

[0004] The utility model aims to provide a special tool for positioning the mechanical seal of the main pump of a nuclear power plant, which can solve the problem that the mechanical seal is easily misplaced during reinstallation due to the poor accuracy of the existing positioning tools.

[0005] The technical solution of the utility model is as follows: a special tool for positioning the mechanical seal of the main pump of a nuclear power plant, the tool comprising: a positioning rod and a slider bracket, the positioning rod is fixed to the top of the support rod and is used for positioning the tertiary sealing shell and the sealing chamber; the slider bracket is fixed to the bottom of the support rod and can clamp the secondary shaft sleeve to fix the position of the entire device.

[0006] Furthermore, the positioning rod includes a positioning rod A and a positioning rod B, which are fixed to the connecting frame by a locking nut A, and the bottoms of the two are respectively provided with grooves matching the pins on the upper surface of the third-level sealing shell and the sealing chamber.

[0007] Furthermore, the positioning rod A is located on the outside of the tool and can position the sealed chamber; the positioning rod B is located on the inside of the tool and can position the third-level sealed housing.

[0008] Furthermore, the slider bracket is a semicircular opening structure, and two sliders are installed at its open end, whose size is adapted to the sleeve positioning block at the top of the secondary sleeve, and the slider is connected with a locking nut B, which clamps and fixes the sleeve positioning block after tightening the locking nut B, so as to realize the positioning of the entire tool. The slider bracket is connected to the support rod through a connecting nut.

[0009] Furthermore, a positioning pin is provided on the top of the surface of the sleeve positioning block, and the third-level sleeve can be installed on the sleeve positioning block through the positioning pin.

[0010] Furthermore, a third-level sealing shell is sleeved on the outer side of the third-level shaft sleeve, and the third-level sealing shell can rotate around the third-level shaft sleeve.

[0011] Compared with the existing technology, the advantages of the utility model are:

[0012] 1. Through the cooperation of the positioning rod and the slider bracket, the upper and lower mechanical seals can be positioned at one time. It is easy to operate and has high precision. It can effectively prevent misalignment problems, avoid rework during work, reduce the risk of accidental exposure to personnel, and reduce collective doses.

[0013] 2. The device has a simple structure and adopts a detachable structure. The overall volume is small. One person can enter the pump chamber to operate it. The operation is easy and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the first step of using a special tool for positioning the mechanical seal of a main pump of a nuclear power plant provided by the utility model;

[0015] Figure 2 A schematic diagram of the second step of using a special tool for positioning the mechanical seal of a main pump of a nuclear power plant provided by the utility model;

[0016] Figure 3 This is a structural schematic diagram of the slider bracket provided by the utility model;

[0017] In the figure: 1. sleeve positioning block; 2. secondary sleeve; 3. sealing chamber; 4. positioning rod A; 5. tertiary sealing housing; 6. tertiary sleeve; 7. positioning rod B; 8. slider bracket; 9. connecting nut; 10. support rod; 11. connecting frame; 12. locking nut A; 13. slider; 14. locking nut B. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1-Figure 3As shown, a special tool for positioning the mechanical seal of the main pump of a nuclear power plant includes a positioning rod and a slider bracket 8. The positioning rod is fixed on the top of the support rod 10, including a positioning rod A4 and a positioning rod B7, which are fixed to the connecting frame 11 by a locking nut A12, and the bottoms of the two are respectively provided with grooves matching the pins on the upper surfaces of the tertiary sealing shell 5 and the sealing chamber 3. The positioning rod A4 is located on the outside of the tool and can position the sealing chamber 3; the positioning rod B7 is located on the inside of the tool and can position the tertiary sealing shell 5.

[0020] The slider bracket 8 is connected to the bottom of the support rod 10 through the connecting nut 9, and is in the shape of a semicircular opening structure. The opening size of the slider bracket 8 is adapted to the sleeve positioning block 1 at the top of the secondary sleeve 2. Two sliders 13 are installed at the open end. The sliders 13 are connected to the locking nuts B14. After the locking nuts B14 are tightened, the sleeve positioning block 1 can be clamped and fixed to achieve the positioning of the entire tool. A positioning pin is set on the top of the surface of the sleeve positioning block 1, and the tertiary sleeve 6 can be installed on the sleeve positioning block 1 through the positioning pin. The outer side of the tertiary sleeve 6 is sleeved with a tertiary sealing shell 5, which can rotate around the tertiary sleeve 6, and its position is positioned by the positioning rod B7.

[0021] The implementation principle of a special tool for positioning the mechanical seal of the main pump of a nuclear power plant in this embodiment is as follows: when positioning the secondary mechanical package and the tertiary mechanical package, first assemble the tool, align the slot of the sleeve positioning block 1 with the slot above the secondary sleeve 2, then clamp the slider bracket 8 on the sleeve positioning block 1 on the top of the secondary sleeve 2, tighten the locking nut B, and clamp it firmly through the slider 13 to complete the fixation of the tool position. Then align and fix the positioning rod A4 with the positioning pin on the sealing chamber 3, and lock the locking nut B14, as shown in FIG. Figure 1 As shown, the position of the positioning rod is fixed; then the third-stage sleeve 6 and the third-stage sealing housing 5 are placed together on the positioning pin of the sleeve positioning block 1, and the positioning rod B7 is positioned on the positioning pin on the third-stage sealing housing 5 by rotating the third-stage sealing housing 5, and finally the precise positioning of the third-stage sealing chamber is achieved when it is disassembled separately, as shown in FIG. Figure 2 shown.

[0022] In the description of the present invention, it should be noted that the terms "left end", "right end", "above", "below", "outside", "inside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] Furthermore, the terms “first”, “second”, and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0024] The above-mentioned embodiment only expresses one implementation method of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A special tool for positioning the mechanical seal of the main pump of a nuclear power plant, characterized in that: The tool comprises: a positioning rod and a slider bracket (8); the positioning rod is fixed on the top of a support rod (10) and is used for positioning a tertiary sealing housing (5) and a sealing chamber (3); the slider bracket (8) is fixed on the bottom of the support rod (10) and is capable of clamping a secondary shaft sleeve (2) and is used for fixing the position of the entire device.

2. A special tool for positioning the mechanical seal of a main pump of a nuclear power plant according to claim 1, characterized in that: The positioning rods include a positioning rod A (4) and a positioning rod B (7), which are vertically fixed to a connecting frame (11) via a locking nut A (12), and grooves matching the pins on the upper surfaces of the third-level sealing housing (5) and the sealing chamber (3) are respectively formed at the bottom of the two rods.

3. A special tool for positioning the mechanical seal of a main pump of a nuclear power plant according to claim 2, characterized in that: The positioning rod A (4) is located on the outside of the tool and can position the sealing chamber (3); the positioning rod B (7) is located on the inside of the tool and can position the third-level sealing shell (5).

4. A special tool for positioning the mechanical seal of a main pump of a nuclear power plant according to claim 1, characterized in that: The slider bracket (8) is a semicircular opening structure, and two sliders (13) are installed at its open end, and their sizes are adapted to the sleeve positioning block (1) at the top of the secondary sleeve (2). The slider (13) is connected to a locking nut B (14). After the locking nut B (14) is tightened, the sleeve positioning block (1) is clamped and fixed to achieve the positioning of the entire tool. The slider bracket (8) is connected to the support rod (10) via a connecting nut (9).

5. A special tool for positioning the mechanical seal of a main pump of a nuclear power plant according to claim 4, characterized in that: A positioning pin is provided on the top of the surface of the shaft sleeve positioning block (1), and the third-level shaft sleeve (6) can be mounted on the shaft sleeve positioning block (1) via the positioning pin.

6. A special tool for positioning the mechanical seal of a main pump of a nuclear power plant according to claim 5, characterized in that: A third-stage sealing shell (5) is sleeved on the outer side of the third-stage shaft sleeve (6), and the third-stage sealing shell (5) is capable of rotating around the third-stage shaft sleeve (6).

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