A vibration isolation system for a water pump unit of a nuclear power plant

Abstract

The utility model belongs to nuclear power engineering technical field, specifically disclose a nuclear power plant water pump unit vibration isolation system, including big reinforced concrete vibration isolation platform, the big reinforced concrete vibration isolation platform top is provided with water pump unit main part, water pump unit main part below is provided with unit mounting seat, the water inlet of water pump unit main part is provided with first pipe component, the water outlet of water pump unit main part is provided with second pipe component, the big reinforced concrete vibration isolation platform below is provided with floor, be provided with concrete foundation beam on the floor, be provided with first vibration isolation subassembly between concrete foundation beam and the big reinforced concrete vibration isolation platform, the big reinforced concrete vibration isolation platform side is provided with small reinforced concrete vibration isolation platform, be provided with second vibration isolation subassembly between small reinforced concrete vibration isolation platform and the floor, water pump unit main part is fixed in the big reinforced concrete vibration isolation platform through unit mounting seat cooperation mounting structure, plays the vibration isolation effect through first vibration isolation subassembly and second vibration isolation subassembly.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power engineering technology, specifically to a vibration isolation system for a water pump unit in a nuclear power plant. Background Technology

[0002] Nuclear power plant buildings and equipment are often required to meet high seismic intensity requirements, typically 8 or 9 degrees. Pump units are commonly used equipment in the nuclear island, and the vibrations and structural noise they generate during operation can easily affect the working environment of personnel within the nuclear island.

[0003] Traditional vibration isolation solutions often use single damping spring isolators or rubber pad supports. While these can provide some vibration isolation, they have the following problems:

[0004] Insufficient vibration isolation: Vibration of the water pump body can easily be transmitted to the building structure through the pipeline, causing secondary noise.

[0005] The small number of vibration isolators results in inconsistent deformation of each isolator, leading to a significant discrepancy between the actual vibration isolation effect of the entire vibration isolation system and the theoretically calculated vibration isolation effect.

[0006] No seismic performance: During an earthquake, the equipment may experience large horizontal displacement, which could cause pipe joints to crack due to excessive displacement. Vibration isolators may become unstable, and the equipment may experience large amplitude vibrations, leading to overturning and other safety hazards.

[0007] While commonly used seismic isolation and earthquake resistance technologies can reduce earthquake damage, in actual operation, the lack of vibration isolation means that the transmission of equipment vibration and structural noise cannot be eliminated or reduced. Therefore, there is an urgent need for an integrated solution that can simultaneously meet the stringent vibration and earthquake resistance requirements of nuclear power plants. Utility Model Content

[0008] The purpose of this invention is to provide a vibration isolation system for water pump units in nuclear power plants. This system provides vibration isolation and structural noise reduction during normal operation of the water pump units, and earthquake resistance during earthquakes, thus solving the vibration problem of water pump units in nuclear power plants.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a vibration isolation system for a water pump unit in a nuclear power plant, comprising a large reinforced concrete vibration isolation platform, a water pump unit body mounted above the large reinforced concrete vibration isolation platform, a unit mounting base mounted below the water pump unit body, a first pipe assembly mounted at the water inlet of the water pump unit body, a second pipe assembly mounted at the water outlet of the water pump unit body, an installation structure between the unit mounting base and the large reinforced concrete vibration isolation platform, a floor slab mounted below the large reinforced concrete vibration isolation platform, a shear key between the large reinforced concrete vibration isolation platform and the floor slab, a concrete foundation beam mounted on the floor slab, a first vibration isolation component mounted between the concrete foundation beam and the large reinforced concrete vibration isolation platform, a small reinforced concrete vibration isolation platform mounted on the side of the large reinforced concrete vibration isolation platform, a second vibration isolation component mounted between the small reinforced concrete vibration isolation platform and the floor slab, and a steel structure support frame connecting the small reinforced concrete vibration isolation platform and the second pipe assembly. The main body of the water pump unit is fixed to the large reinforced concrete vibration isolation platform through the unit mounting base and the installation structure. The vibration isolation effect is achieved through the first vibration isolation component and the second vibration isolation component.

[0010] In a preferred embodiment of this invention, the first vibration isolation component includes a first damping spring isolator and first embedded steel plates connected to both ends of the first damping spring isolator. The first damping spring isolator is connected to the large reinforced concrete vibration isolation platform via the first embedded steel plates, and both ends of the first damping spring isolator are equipped with rubber vibration isolation pads. The first damping spring isolator supports the large reinforced concrete vibration isolation platform and the main body of the water pump unit, and achieves a vibration isolation effect.

[0011] In a preferred embodiment of this invention, the second vibration isolation component includes a second damping spring isolator and second embedded steel plates connected to both ends of the second damping spring isolator. The second damping spring isolator is connected to the small reinforced concrete vibration isolation platform and the floor slab via the second embedded steel plates, and both ends of the first damping spring isolator are equipped with rubber vibration isolation pads. The second damping spring isolator supports the small reinforced concrete vibration isolation platform and the second pipeline assembly, thus achieving a vibration isolation effect. The rubber vibration isolation pads provide high-frequency vibration isolation and horizontal vibration isolation.

[0012] The damped spring vibration isolators operate at frequencies below 3.5Hz. Both the first and second vibration isolation components are arranged in two rows, with a typical spacing of 0.4-1.2m between the isolators in each row.

[0013] As a preferred embodiment of the present invention, the first pipeline assembly includes a first rubber connector and a first water pipe connected to one end of the first rubber connector, and the other end of the first rubber connector is connected to the water inlet of the main body of the water pump unit.

[0014] As a preferred embodiment of the present invention, the second pipeline assembly includes a second rubber connector and a second water pipe connected to one end of the second rubber connector, the other end of the second rubber connector being connected to the outlet of the main body of the water pump unit, and the top of the steel structure support frame being connected to the second rubber connector and the second water pipe through a flange.

[0015] Both the first and second rubber connectors are made of flexible rubber, serving as flexible connection components that can compensate for displacement, absorb vibration, reduce stress, and protect the pipeline. The steel structure support frame is a sliding type, which improves the support effect and facilitates its integration with the second vibration isolation component for vibration isolation.

[0016] In a preferred embodiment of this invention, the installation structure includes a square pit, grout, and anchor bolts. The square pit is formed on a large reinforced concrete vibration isolation platform. The grout fills the square pit, and the anchor bolts pass through the unit mounting base and are fixed within the grout. This improves the fixing effect. The depth of the square pit 2 is 1.2-1.5 times the length of the anchor bolts 12 of the water pump unit.

[0017] In a preferred embodiment of this invention, a third embedded steel plate is connected to the bottom of the shear key, and the shear key is connected to the floor slab through the third embedded steel plate. This resists horizontal shear force and ensures the stability of the vibration isolation table.

[0018] In a preferred embodiment of this invention, the shear keys are rectangular or circular, evenly distributed along the bottom of the large reinforced concrete vibration isolation platform, and are made of high-strength steel or carbon fiber composite material. The number is determined by calculation, typically 4-8.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This invention significantly reduces the transmission of pump vibration to the building structure through a damped spring vibration isolator, avoiding resonance risks and meeting the stringent vibration sensitivity requirements of nuclear power facilities. Large and small reinforced concrete vibration isolation tables isolate unit and pipeline vibrations in designated areas, achieving multi-dimensional vibration reduction. The horizontal shear resistance of the isolation tables is enhanced to prevent displacement caused by earthquakes or sudden impacts. Attached Figure Description

[0021] Figure 1 This is a top view of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the AA cross-sectional structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the BB cross-sectional structure of this utility model;

[0024] Figure 4This is a schematic diagram of the CC cross-sectional structure of this utility model.

[0025] In the diagram: 1. Large reinforced concrete vibration isolation table; 2. Main body of water pump unit; 201. Unit mounting base; 202. First rubber connector; 203. First water pipe; 204. Second rubber connector; 205. Second water pipe; 3. Floor slab; 301. Concrete foundation beam; 4. First vibration isolation component; 401. First damping spring vibration isolator; 402. First embedded steel plate; 5. Second vibration isolation component; 501. Second damping spring vibration isolator; 502. Second embedded steel plate; 6. Installation structure; 601. Pouring square pit; 602. Grouting material; 603. Anchor bolts; 7. Shear key; 701. Third embedded steel plate; 8. Small reinforced concrete vibration isolation table; 9. Steel structure support frame. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Please see Figure 1-4This utility model provides a technical solution: a vibration isolation system for a water pump unit in a nuclear power plant, comprising a large reinforced concrete vibration isolation platform 1, a water pump unit body 2 mounted above the large reinforced concrete vibration isolation platform 1, a unit mounting base 201 mounted below the water pump unit body 2, a first pipe assembly at the water inlet of the water pump unit body 2, a second pipe assembly at the water outlet of the water pump unit body 2, and an installation structure 6 between the unit mounting base 201 and the large reinforced concrete vibration isolation platform 1. A floor slab 3 is installed below the vibration table 1. A shear key 7 is installed between the large reinforced concrete vibration isolation table 1 and the floor slab 3. A concrete foundation beam 301 is installed on the floor slab 3. A first vibration isolation component 4 is installed between the concrete foundation beam 301 and the large reinforced concrete vibration isolation table 1. A small reinforced concrete vibration isolation table 8 is installed on the side of the large reinforced concrete vibration isolation table 1. A second vibration isolation component 5 is installed between the small reinforced concrete vibration isolation table 8 and the floor slab 3. A steel structure support frame 9 is connected between the small reinforced concrete vibration isolation table 8 and the second pipe component.

[0030] The main body 2 of the water pump unit is fixed on the large reinforced concrete vibration isolation platform 1 through the unit mounting base 201 and the mounting structure 6. The vibration isolation effect is achieved through the first vibration isolation component 4 and the second vibration isolation component 5.

[0031] Specifically, the first vibration isolation component 4 includes a first damping spring isolator 401 and first embedded steel plates 402 connected to both ends of the first damping spring isolator 401. The first damping spring isolator 401 is connected to the large reinforced concrete vibration isolation platform 1 through the first embedded steel plates 402, and both ends of the first damping spring isolator 401 are equipped with rubber vibration isolation pads. The first damping spring isolator 401 supports the large reinforced concrete vibration isolation platform 1 and the main body of the water pump unit 2, and achieves a vibration isolation effect.

[0032] Specifically, the second vibration isolation component 5 includes a second damping spring isolator 501 and second embedded steel plates 502 connected to both ends of the second damping spring isolator 501. The second damping spring isolator 501 is connected to the small reinforced concrete vibration isolation platform 8 and the floor slab 3 through the second embedded steel plates 502, and both ends of the first damping spring isolator 401 are equipped with rubber vibration isolation pads. The second damping spring isolator 501 supports the small reinforced concrete vibration isolation platform 8 and the second pipe assembly, and achieves a vibration isolation effect. The rubber vibration isolation pads provide high-frequency vibration isolation and horizontal vibration isolation.

[0033] The damping spring vibration isolators operate at frequencies below 3.5Hz. Both the first vibration isolation component 4 and the second vibration isolation component 5 are arranged in two rows, with a typical spacing of 0.4-1.2m between the isolators in each row.

[0034] Specifically, the first pipeline assembly includes a first rubber connector 202 and a first water pipe 203 connected to one end of the first rubber connector 202, and the other end of the first rubber connector 202 is connected to the water inlet of the water pump unit body 2.

[0035] Specifically, the second pipeline assembly includes a second rubber connector 204 and a second water pipe 205 connected to one end of the second rubber connector 204. The other end of the second rubber connector 204 is connected to the outlet of the water pump unit body 2. The top of the steel structure support frame 9 is connected to the second rubber connector 204 and the second water pipe 205 through a flange.

[0036] Both the first rubber connector 202 and the second rubber connector 204 are flexible rubber connectors, serving as flexible connection components that can compensate for displacement, absorb vibration, reduce stress, and protect the pipeline. The steel structure support frame 9 is a sliding steel structure support frame, which improves the support effect and facilitates its coordination with the second vibration isolation component 5 to achieve a vibration isolation effect.

[0037] Specifically, the installation structure 6 includes a square pit 601, grout 602, and anchor bolts 603. The square pit 601 is formed on the large reinforced concrete vibration isolation platform 1. The grout 602 fills the square pit 601, and the anchor bolts 603 pass through the unit mounting base 201 and are fixed in the grout 602. This improves the fixing effect. The depth of the square pit 601 is 1.2-1.5 times the length of the anchor bolts 60312 of the water pump unit.

[0038] Specifically, the bottom of the shear key 7 is connected to a third embedded steel plate 701, and the shear key 7 is connected to the floor slab 3 through the third embedded steel plate 701. This resists horizontal shear force and ensures the stability of the vibration isolation table.

[0039] Specifically, the shear keys 7 are rectangular or circular, evenly distributed along the bottom of the large reinforced concrete vibration isolation platform 1, and are made of high-strength steel or carbon fiber composite material. The number is determined by calculation, typically 4-8.

[0040] In summary, this system uses a large reinforced concrete vibration isolation platform 1 to support the main body 2 of the water pump unit, and is isolated from the floor slab 3 by the first vibration isolation component 4 at the bottom to absorb low-frequency vibrations. A small reinforced concrete vibration isolation platform 8 independently supports the steel structure support frame 9 on the pipe side through the second vibration isolation component 5, preventing pipe vibration from being transmitted to the building structure. The shear key 7 uses high-strength steel or carbon fiber material to resist horizontal shear force and ensure the stability of the vibration isolation platform. The first and second pipe components are installed at the pump unit inlet and outlet to compensate for pipe thermal displacement, absorb high-frequency vibrations and noise, and reduce pipe stress. The design of pouring square pits 601, grouting material 602, and anchor bolts 603, combined with the unit mounting base 201, is fixed by high-precision grouting, ensuring a rigid connection while allowing for minor adjustments to avoid installation stress.

[0041] This design is particularly suitable for applications with stringent vibration control requirements, such as nuclear power plants, thermal power plants, and large industrial circulating water systems. It balances safety, durability, and economy, and is a typical optimized solution for vibration isolation of electromechanical equipment.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nuclear power plant water pump unit vibration isolation system characterized by: The system includes a large reinforced concrete vibration isolation table (1), a water pump unit body (2) is provided above the large reinforced concrete vibration isolation table (1), a unit mounting base (201) is provided below the water pump unit body (2), a first pipe assembly is provided at the water inlet of the water pump unit body (2), a second pipe assembly is provided at the water outlet of the water pump unit body (2), and an installation structure (6) is provided between the unit mounting base (201) and the large reinforced concrete vibration isolation table (1). A floor slab (3) is installed below the large reinforced concrete vibration isolation table (1). A shear key (7) is installed between the large reinforced concrete vibration isolation table (1) and the floor slab (3). A concrete foundation beam (301) is installed on the floor slab (3). A first vibration isolation component (4) is installed between the concrete foundation beam (301) and the large reinforced concrete vibration isolation table (1). A small reinforced concrete vibration isolation table (8) is installed on the side of the large reinforced concrete vibration isolation table (1). A second vibration isolation component (5) is installed between the small reinforced concrete vibration isolation table (8) and the floor slab (3). A steel structure support frame (9) is connected between the small reinforced concrete vibration isolation table (8) and the second pipe assembly.

2. The vibration isolation system for a nuclear power plant water pump unit according to claim 1, characterized in that: The first vibration isolation component (4) includes a first damping spring isolator (401) and a first embedded steel plate (402) connected to both ends of the first damping spring isolator (401). The first damping spring isolator (401) is connected to the large reinforced concrete vibration isolation table (1) through the first embedded steel plate (402), and both ends of the first damping spring isolator (401) are equipped with rubber vibration isolation pads.

3. The vibration isolation system for a nuclear power plant water pump unit according to claim 1, characterized in that: The second vibration isolation component (5) includes a second damping spring vibration isolator (501) and a second embedded steel plate (502) connected to both ends of the second damping spring vibration isolator (501). The second damping spring vibration isolator (501) is connected to the small reinforced concrete vibration isolation platform (8) and the floor slab (3) through the second embedded steel plate (502), and both ends of the first damping spring vibration isolator (401) are equipped with rubber vibration isolation pads.

4. The water pump unit vibration isolation system for a nuclear power plant of claim 1, wherein: The first pipeline assembly includes a first rubber connector (202) and a first water pipe (203) connected to one end of the first rubber connector (202), and the other end of the first rubber connector (202) is connected to the water inlet of the main body (2) of the water pump unit.

5. A vibration isolation system for a water pump unit of a nuclear power plant according to claim 1, characterized in that: The second pipeline assembly includes a second rubber connector (204) and a second water pipe (205) connected to one end of the second rubber connector (204). The other end of the second rubber connector (204) is connected to the outlet of the water pump unit body (2). The top of the steel structure support frame (9) is connected to the second rubber connector (204) and the second water pipe (205) through a flange.

6. A nuclear power plant water pump unit vibration isolation system as set forth in claim 1, characterized by: The installation structure (6) includes a square pit (601), grout (602) and anchor bolts (603). The square pit (601) is opened on the large reinforced concrete vibration isolation platform (1). The grout (602) is filled in the square pit (601). The anchor bolts (603) pass through the unit mounting base (201) and are fixed in the grout (602).

7. A vibration isolation system for a nuclear power plant water pump unit according to claim 1, characterized in that: The bottom of the shear key (7) is connected to a third embedded steel plate (701), and the shear key (7) is connected to the floor slab (3) through the third embedded steel plate (701).

8. A water pump unit vibration isolation system for a nuclear power plant according to claim 7, characterized in that: The shear key (7) is rectangular or circular and is evenly distributed along the bottom of the large reinforced concrete vibration isolation platform (1). The shear key (7) is made of high-strength steel or carbon fiber composite material.

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