Large-rigidity air extractor shell structure

Abstract

The invention relates to a large-rigidity air extractor shell structure which comprises a first cylinder, a second cylinder, a frame body, a sealing plate, a rib plate and a seat plate. The cylinder I and the cylinder II are placed on the inner side of the frame body and are welded with cross beams and longitudinal beams of the frame body into a whole; and the sealing plate, the rib plate and the seat plate are welded outside the frame body to form a large-rigidity air extractor shell structure. Through the integrated design of the frame body and the cylinder body, the rigidity of the shell is remarkably improved, the number of free modes is reduced, the mode frequency is improved, the vibration of the shell is effectively reduced, and the vibration problem caused by insufficient rigidity of a conventional air extractor shell is solved.

Description

Technical Field

[0001] The present invention relates to the field of ship secondary circuits and steam turbines, and in particular to a high-rigidity frame-type shell structure for an air extractor, which aims to improve the rigidity of the air extractor shell and reduce vibration. Background Art

[0002] In the secondary circuit and steam turbine system of a ship, the vacuum pump is a key device for maintaining the vacuum environment of the system. The stability of its shell structure directly affects the operating efficiency and safety of the equipment. The shell of a conventional vacuum pump is made by welding together multiple square or round metal cylinders. Due to the weight limit of the equipment, the cylinder generally adopts a thin-walled structure. When working, it is easily affected by the impact of steam flow, causing the shell structure to produce translation, rotation and torsion in all directions. The rigidity of the original shell structure is weak. Figure 1 shown.

[0003] During operation, when the shell is impacted by steam flow, it is prone to translational, rotational, and torsional motion in multiple directions, causing increased shell vibration. This vibration not only affects the vacuum stability of the vacuum extractor but can also loosen connecting components, cause fatigue damage, and shorten the service life of the equipment.

[0004] In the existing related technologies, such as the "A combined vacuum pump with a frame structure" disclosed in patent document CN117052725A, its frame is mainly used to support components such as steam seal vacuum pumps, various stages of steam jet vacuum pumps, etc. The shell plate is only welded to the surface of the frame and does not form an integrated rigid structure with the internal cylinder, and the rigidity enhancement of the cylinder itself is limited; the "integrated steel frame condenser shell" disclosed in patent document CN204154036U is mainly aimed at optimizing the assembly efficiency and air inlet resistance of the condenser. The frame is an integrated structure of the shell components, which has nothing to do with the rigidity requirements of the vacuum pump shell, and does not involve the integrated design of the cylinder and the frame.

[0005] Therefore, there is an urgent need for a structural design that can fundamentally improve the rigidity of the vacuum pump housing itself and reduce vibration. Summary of the Invention

[0006] The present invention aims to solve the problems of insufficient rigidity and large vibration of conventional vacuum pump shells, and provides a high-rigidity vacuum pump shell structure, which is composed of several cross beams and longitudinal beams, arranged on the outside of the cylinder, and is welded to form an integrated shell structure with the original cylinder, thereby improving the overall rigidity of the vacuum pump shell.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is: a high-rigidity vacuum pump shell structure, including cylinder body one, cylinder body two, a frame body, a sealing plate, a rib plate and a seat plate; the cylinder body one and cylinder body two are placed on the inner side of the frame body, and are welded into one with the cross beam and longitudinal beam of the frame body; the sealing plate, rib plate and seat plate are welded to the outside of the frame body to form a high-rigidity vacuum pump shell structure.

[0008] Furthermore, the frame body is made by cross-welding transverse beams and longitudinal beams.

[0009] Furthermore, the cross beams of the frame body include long cross beams and short cross beams, and the longitudinal beams include long longitudinal beams and short longitudinal beams; the long cross beams are arranged at intervals along the length direction of the frame body, and the short cross beams are located between the long cross beams and arranged along the width direction; the long longitudinal beams are arranged at intervals along the width direction of the frame body, and the short longitudinal beams are located between the long longitudinal beams and arranged along the length direction.

[0010] Furthermore, the number of the long cross beams is 6, the number of the short cross beams is 12, the number of the long longitudinal beams is 8, and the number of the short longitudinal beams is 8.

[0011] Furthermore, the cross beams and longitudinal beams are made of channel steel.

[0012] Furthermore, the outer walls of the cylinder body 1 and the cylinder body 2 are connected to the cross beams and longitudinal beams of the frame body by full welding.

[0013] Furthermore, the ribs are triangular in structure and are evenly arranged between the beams and the bottom plate at both ends of the frame body.

[0014] Furthermore, the sealing plate covers the side surfaces and the top of the frame body, and the sealing plate and the edge of the frame body are fixed by continuous welding.

[0015] The beneficial effects of the present invention are:

[0016] The present invention utilizes a high-rigidity frame-type vacuum pump housing structure. Within a certain frequency range, the frame-type structure reduces the number of free modes exponentially compared to the original housing structure. For the same modal shape, the frame-type housing structure exhibits a higher modal frequency than the original housing structure, significantly outperforming the original structure in rigidity. This improves the overall structural modality and reduces structural vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the prototype frameless extractor housing;

[0018] Figure 2 This is a schematic diagram of the high-rigidity shell structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the frame structure;

[0020] Figure 4 Comparison of the calculation results of the original structure and the frame structure model, where: (a) is the 26.3Hz diagonal torsional mode of the original structure, and (b) is the 48.8Hz diagonal torsional mode of the frame structure;

[0021] In the figure: 1. Cylinder 1, 2. Cover plate, 3. Cylinder 2, 4. Frame body, 5. Ribs, 6. Bottom plate, 7. Long cross beam, 8. Short cross beam, 9. Long longitudinal beam, 10. Short longitudinal beam. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figure 2 3 shows an embodiment of the present invention's technical solution. The high-rigidity vacuum pump housing structure comprises the following components: cylinder 1, sealing plate 2, cylinder 2, frame 4, ribs 5, and seat 6. Cylinder 1 and cylinder 2, 3, are placed inside frame 4 and welded to the frame's crossbeams and longitudinal beams. The sealing plate, ribs, and seat are then welded to the outside to form the housing. Frame 4 is welded to the outer wall of the original vacuum pump housing to create the high-rigidity vacuum pump housing structure.

[0024] The frame body 4 is made of channel steels arranged at different positions in the horizontal and vertical directions. Figure 3 As shown, it includes long cross beams 7, short cross beams 8, long longitudinal beams 9, and short longitudinal beams 10. The long cross beams 7 are arranged at intervals along the length direction of the frame body, and the short cross beams 8 are located between the long cross beams 7 and arranged along the width direction; the long longitudinal beams 9 are arranged at intervals along the width direction of the frame body, and the short longitudinal beams 10 are located between the long longitudinal beams and arranged along the length direction.

[0025] Preferably, the number of the long transverse beams 7 is 6, the number of the short transverse beams 8 is 12, the number of the long longitudinal beams 9 is 8, and the number of the short longitudinal beams 10 is 8.

[0026] Preferably, the cross beams and longitudinal beams are made of channel steel.

[0027] Preferably, the outer walls of cylinder 1 and cylinder 2 3 are connected to the cross beams and longitudinal beams of the frame body 4 by full welding.

[0028] Preferably, the ribs 5 are triangular in structure and are evenly arranged between the cross beams at both ends of the frame body 4 and the bottom plate 6 .

[0029] Preferably, the sealing plate 2 covers the sides and the top of the frame body 4, and the sealing plate 2 and the edges of the frame body 4 are fixed by continuous welding.

[0030] The present invention adopts the design of high-rigidity frame-type vacuum pump shell structure. Within a certain frequency range, the number of free modes of the frame-type structure is reduced exponentially compared with the original shell structure. The diagonal torsional frequency of the original structure is 26.3Hz, while the diagonal torsional modal frequency of the frame-type structure is 48.8Hz. Figure 4 (a) and (b) show the same modal vibration shape. The modal frequencies of the frame-type shell structure are all higher than those of the original shell structure, and the rigidity of the frame-type shell structure is significantly superior to that of the original shell structure. The overall modal properties of the structure are enhanced, reducing the structural vibration of the shell.

[0031] In summary, the present invention significantly improves the rigidity and stability of the vacuum pump shell through the integrated design of the frame and the cylinder, effectively solves the vibration problem of the conventional structure, and is suitable for vacuum pump equipment in the field of ship secondary circuits and steam turbines.

Claims

1. A high-rigidity vacuum pump housing structure, characterized in that: It includes cylinder one, cylinder two, a frame body, a sealing plate, a rib plate and a seat plate; the cylinder one and cylinder two are placed inside the frame body and are welded to the crossbeam and longitudinal beam of the frame body as a whole; the sealing plate, rib plate and seat plate are welded to the outside of the frame body to form a high-rigidity vacuum pump shell structure.

2. The high-rigidity vacuum pump housing structure according to claim 1, characterized in that: The frame body is made by cross-welding transverse beams and longitudinal beams.

3. The high-rigidity vacuum pump housing structure according to claim 2, characterized in that: The cross beams of the frame body include long cross beams and short cross beams, and the longitudinal beams include long longitudinal beams and short longitudinal beams; the long cross beams are arranged at intervals along the length direction of the frame body, and the short cross beams are located between the long cross beams and arranged along the width direction; the long longitudinal beams are arranged at intervals along the width direction of the frame body, and the short longitudinal beams are located between the long longitudinal beams and arranged along the length direction.

4. The high-rigidity vacuum extractor housing structure according to claim 2, characterized in that: The number of the long cross beams is 6, the number of the short cross beams is 12, the number of the long longitudinal beams is 8, and the number of the short longitudinal beams is 8.

5. The high-rigidity vacuum extractor housing structure according to claim 1, characterized in that: The cross beams and longitudinal beams are made of channel steel.

6. The high-rigidity vacuum extractor housing structure according to claim 1, characterized in that: The outer walls of the cylinder body 1 and the cylinder body 2 are connected to the cross beams and longitudinal beams of the frame body by full welding.

7. The high-rigidity vacuum extractor housing structure according to claim 1, characterized in that: The ribs are triangular in structure and are evenly arranged between the cross beams and the bottom plate at both ends of the frame body.

8. The high-rigidity vacuum pump housing structure according to claim 1, characterized in that: The sealing plate covers the side surfaces and the top of the frame body, and the sealing plate is fixed to the edge of the frame body by continuous welding.

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