A gasket for improving resonance of vertical equipment

Abstract

The present invention relates to a gasket for improving the resonance of vertical equipment, which can improve the resonance to reduce the vibration of equipment without changing the original installation structure. It includes a small gasket A, a small gasket B, a small gasket C, and a large gasket; the large gasket is in a circular ring shape with a plurality of circular bolt holes, and the small gasket A, the small gasket B, and the small gasket C are arranged below the large gasket respectively, and the positions of the small gasket A, the small gasket B, and the small gasket C are point A, point B, and point C respectively, and the points A, point B, and point C are located on the circle formed by the centers of the bolt holes, and the points A, point B, and point C shall not be located in the bolt hole area. The gasket can improve the resonance to reduce the vibration of equipment without changing the original installation structure.

Description

Technical Field

[0001] The invention relates to a gasket for improving the resonance of vertical equipment, which can improve the resonance and reduce the vibration of equipment without changing the original installation structure. Background Art

[0002] Many rotating equipment in nuclear power plants are vertical structures. Such vertical structures often resonate during on-site installation due to insufficient design considerations. Since the rotation speed of many equipment cannot be changed, redesign and on-site modification are required to control the resonance, and the natural frequency of the equipment must be changed to reduce the resonance response. However, such work is very time-consuming and will restrict the construction and operation of the power plant.

[0003] Vertical equipment generally connects the bottom ring base to the foundation through bolts, and sometimes a gasket is placed between the ring base and the foundation to adjust the horizontality of the vertical equipment. Studies have found that the gasket, as an intermediate component between the equipment and the foundation, will also affect the installation natural frequency of the vertical equipment to a certain extent. In order to quickly improve the resonance of the equipment without changing the equipment structure, a new type of gasket needs to be invented and designed according to the actual situation to adjust the natural frequency of the equipment after installation. Summary of the invention

[0004] The object of the present invention is to provide a gasket for improving the resonance of a vertical device so as to quickly reduce the resonance amplitude of the device.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A gasket for improving resonance of vertical equipment comprises a small gasket A, a small gasket B, a small gasket C and a large gasket; the large gasket is in a circular ring shape and has a plurality of circular bolt holes thereon; the small gasket A, the small gasket B and the small gasket C are arranged below the large gasket respectively; the positions of the small gasket A, the small gasket B and the small gasket C are point A, point B and point C respectively; the points A, point B and point C are located on a circle formed by the centers of the bolt holes; and the points A, point B and point C shall not be located in the bolt hole area.

[0007] The small gasket A, small gasket B and small gasket C are rectangular.

[0008] The small gasket A, small gasket B and small gasket C are made of stainless steel.

[0009] The small gasket A, small gasket B and small gasket C are made of cast iron.

[0010] The large gasket is made of rubber.

[0011] The large gasket is made of polytetrafluoroethylene.

[0012] If the natural frequency of the equipment needs to be reduced, the thickness of small gasket A, small gasket B, and small gasket C is designed to be 0.5mm to 3mm; when not compressed, the thickness of the large gasket is designed to be 1 to 8 times the thickness of small gasket A, small gasket B, and small gasket C; Point A, Point B, and Point C form an acute triangle; the center of gravity of the vertical equipment is projected to the gasket plane as point G, and point G is located in triangle ABC. If the natural frequency of the equipment in the x direction is reduced more than that in the y direction, the projection length of triangle ABC on the x-axis is shorter than that on the y-axis.

[0013] If the natural frequency of the equipment needs to be increased, when not compressed, the thickness of the large gasket is designed to be 0 to 3 times the thickness of the small gasket A, small gasket B, and small gasket C. The thickness of the large gasket is 0, which means there is no large gasket.

[0014] The beneficial effects achieved by the present invention are:

[0015] Without changing the rotation frequency and structure of the equipment, the natural frequency of the equipment can be adjusted quickly and slightly. The damping of the equipment after installation can be increased. The resonance amplitude can be quickly reduced in a short time to complete the treatment of structural resonance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Front view of the gasket to improve the resonance of vertical equipment;

[0017] Figure 2 A cross-sectional view of a gasket used to improve resonance in vertical equipment;

[0018] In the figure: 1. small gasket A; 2. small gasket B; 3. small gasket C; 4. large gasket.

[0019] Equipment center of gravity projection G, small gasket position points A, B, C. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 , Figure 2 As shown, the gasket for improving the resonance of a vertical device described in the present invention includes a small gasket A1, a small gasket B2, a small gasket C3, and a large gasket 4.

[0022] The new type of gasket is in the shape of a circular ring as a whole, which matches the circular base of the vertical equipment, and the center of the ring is the 0 point. The new type of gasket is composed of two materials. Small gasket A1, small gasket B2, and small gasket C3 are made of the same material, and large gasket 4 is made of another material. Large gasket 4 is in the shape of a circular ring as a whole, and has several circular bolt holes on it, which are convenient for the connecting bolts of the equipment and the foundation to pass through. Small gasket A1, small gasket B2, and small gasket C3 are arranged below large gasket 4 respectively, and their shapes can be rectangular or other shapes that can adapt to the installation foundation. The horizontality of the equipment in the plane is mainly adjusted by the thickness of small gasket A1, small gasket B2, and small gasket C3. The position points of small gasket A1, small gasket B2, and small gasket C3 are point A, point B, and point C respectively. Point A, point B, and point C are located on the circle formed by the center of the bolt holes. Point A, point B, and point C must not be located in the bolt hole area. Small gasket A1, small gasket B2, and small gasket C3 are arranged near point A, point B, and point C respectively. If the small gasket overlaps with the bolt hole, it is necessary to move the small gasket along the circumference to prevent the bolt from passing through the gasket after the small gasket blocks the bolt hole. Small gasket A1, small gasket B2, and small gasket C3 are made of harder materials with less compressibility, such as stainless steel and cast iron, and large gasket 4 is made of materials with greater elasticity, greater compressibility, and higher damping, such as rubber and polytetrafluoroethylene.

[0023] If the natural frequency of the equipment needs to be reduced, the bolt torque should be as small as possible within the qualified range. The thickness of small gasket A1, small gasket B2, and small gasket C3 is relatively thick, and can be designed to be 0.5mm to 3mm. When not compressed, the thickness of large gasket 4 is generally designed to be 1 to 8 times the thickness of small gasket A1, small gasket B2, and small gasket C3. Point A, point B, and point C form an acute triangle. The center of gravity of the vertical equipment is projected onto the gasket plane as point G. Point G should be located in triangle ABC, and point G should maintain a certain distance from each side of triangle ABC. The positions of points A, B, and C can be adjusted according to the natural frequency of the equipment. If you want the natural frequency of the equipment in the x direction to be lower than that in the y direction, make the projection length of triangle ABC on the x-axis shorter than that on the y-axis, and vice versa.

[0024] If the natural frequency of the equipment needs to be increased, the bolt torque should be as large as possible within the qualified range. The thickness of small gasket A1, small gasket B2, and small gasket C3 is relatively thin, and their thickness should be reduced as much as possible. When not compressed, the thickness of large gasket 4 is generally designed to be 0 to 3 times the thickness of small gasket A1, small gasket B2, and small gasket C3. The thickness of large gasket 4 is 0, which means there is no large gasket 4. The positions of point A, point B, and point C can be adjusted according to the horizontality of the equipment without considering the relationship with point G.

Claims

1. A gasket for improving the resonance of vertical equipment, characterized in that: It includes small gasket A, small gasket B, small gasket C and large gasket; the large gasket is in a circular shape and has a plurality of circular bolt holes thereon, the small gasket A, small gasket B and small gasket C are respectively arranged below the large gasket, the position points of small gasket A, small gasket B and small gasket C are point A, point B and point C respectively, point A, point B and point C are located on the circle formed by the centers of the bolt holes, and point A, point B and point C shall not be located in the bolt hole area.

2. The gasket for improving resonance of vertical equipment according to claim 1, characterized in that: The small gasket A, small gasket B and small gasket C are rectangular.

3. The gasket for improving resonance of vertical equipment according to claim 1, characterized in that: The small gasket A, small gasket B and small gasket C are made of stainless steel.

4. The gasket for improving resonance of vertical equipment according to claim 1, characterized in that: The small gasket A, small gasket B and small gasket C are made of cast iron.

5. The gasket for improving resonance of vertical equipment according to claim 1, characterized in that: The large gasket is made of rubber.

6. The gasket for improving resonance of vertical equipment according to claim 1, characterized in that: The large gasket is made of polytetrafluoroethylene.

7. The gasket for improving resonance of vertical equipment according to claim 1, characterized in that: If the natural frequency of the equipment needs to be reduced, the thickness of small gasket A, small gasket B, and small gasket C is designed to be 0.5mm to 3mm; when not compressed, the thickness of the large gasket is designed to be 1 to 8 times the thickness of small gasket A, small gasket B, and small gasket C; Point A, Point B, and Point C form an acute triangle; the center of gravity of the vertical equipment is projected to the gasket plane as point G, and point G is located in triangle ABC. If the natural frequency of the equipment in the x direction is reduced more than that in the y direction, the projection length of triangle ABC on the x-axis is shorter than that on the y-axis.

8. The gasket for improving resonance of vertical equipment according to claim 1, characterized in that: If the natural frequency of the equipment needs to be increased, when not compressed, the thickness of the large gasket is designed to be 0 to 3 times the thickness of the small gasket A, small gasket B, and small gasket C. The thickness of the large gasket is 0, which means there is no large gasket.

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