CN111396680A - Vibration isolation support of nuclear power station - Google Patents

Abstract

The invention discloses a vibration isolation support of a nuclear power station, which comprises a pipeline, a pipe clamp, a support rod and a bottom plate, wherein the lower part of the bottom plate is provided with a vibration isolation mechanism, the vibration isolation mechanism comprises an elastic device and a rigid device, the rigid device comprises a limiter and two connecting pieces, each connecting piece is fixedly connected with a supporting piece, an adjusting cushion plate is arranged between the bottom end of each connecting piece and the supporting piece, the upper end of the limiter is provided with a pin shaft hole, a connecting pin shaft is inserted in the pin shaft hole, and two ends of the connecting pin shaft are respectively and fixedly connected with the corresponding connecting pieces. The shock insulation support is simple in structure, functional parts used on the device can be additionally arranged on the basis of not damaging the structure of the original support, the design and production cost is reduced, in addition, the shock insulation support not only has a good shock insulation function, but also has a rigid supporting effect under special working conditions, and the safety coefficient of a pipeline system is improved.

Description

A vibration isolation support for a nuclear power plant

technical field

The invention relates to the technical field of vibration isolation devices, in particular to a vibration isolation bracket of a nuclear power plant.

Background technique

Vibration isolation bracket is a kind of bracket with shock absorbing effect that is often used in the fields of architectural design, power engineering, seismic equipment, etc. According to the different places of use, it can be made of plastic, rubber, stainless steel and other materials, and has a variety of structures. In the process of seismic design of pipelines in nuclear power plants, it is necessary to conduct seismic calculation and review of pipelines. The pipelines in nuclear power plants are very complex, and the load of some main pipelines is very large. Seismic isolation structures are required to reduce pipeline vibrations. And due to the particularity of the nuclear power plant site, this kind of vibration isolation bracket also needs to have a certain rigidity to cope with the stress of the pipeline under special working conditions, and the general vibration isolation components, such as springs, rubber, etc., cannot withstand large vibrations. Therefore, the pipes in the nuclear power plant are generally fixed directly with rigid brackets.

There are many kinds of existing rigid supports and rich functions, but for some pipelines in nuclear power plants with large size, high medium flow rate or large vibration energy, such as the main steam pipeline, the method of using rigid supports to fix the pipeline has obvious shortcomings. First, the rigidity The support can not offset the vibration of the pipeline, but may cause resonance phenomenon, which will aggravate the vibration of the pipeline. Second, the vibration of the pipeline will be transmitted to the workshop through the rigid support. In the long run, it will not only affect the stability of the workshop structure, but also lead to excessive noise and endanger the work. The physical and mental health of the personnel is healthy, but if the support with elastic structure is used, under abnormal conditions, such as an earthquake, the elastic support cannot bear a large load. Therefore, in order to improve the isolation support and make it suitable for the use of nuclear power plant pipelines, we propose A vibration isolation support for a nuclear power plant.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the disadvantage that the vibration isolation bracket of the pipeline in the nuclear power plant can not isolate the vibration but also can bear the large load to cope with the abnormal working condition, and proposes a vibration isolation bracket of the nuclear power plant.

In order to achieve the above object, the present invention adopts the following technical solutions:

A vibration isolation bracket for a nuclear power plant, comprising pipes, pipe clamps, support rods and a bottom plate, a vibration isolation mechanism is arranged at the lower part of the bottom plate, the vibration isolation mechanism includes an elastic device and a rigid device, and the rigid device includes a limiter and two connecting pieces symmetrically welded on the bottom of the bottom plate, each connecting piece is fixedly connected with a supporting piece by stud bolts, and an adjusting backing plate is arranged between the bottom end of each connecting piece and the supporting piece, so The upper end of the stopper is provided with a pin shaft hole and a connecting pin shaft is inserted in the pin shaft hole, and both ends of the connecting pin shaft are respectively fixedly connected with the corresponding connecting pieces.

Preferably, the inner diameter of the pin hole is 4.5mm-5.5mm larger than the outer diameter of the connection pin, and the gap between the inner wall of the pin hole and the outer wall of the connection pin is 1.9mm-2.1mm.

Preferably, the elastic device includes a vibration isolator and two upper covers movably connected to the vibration isolator, each of the support members is fixedly connected to the corresponding upper cover, and a mounting plate is fixedly connected to the bottom of the vibration isolator .

Preferably, the pipe clamp is sleeved on the outside of the pipe, the upper end of the support rod is fixedly connected to the outer side wall of the pipe clamp, and the lower end of the support rod is fixedly connected to the upper surface of the bottom plate.

Preferably, the vibration isolator comprises two symmetrically arranged spring rods and two damping springs, the lower ends of each of the damping springs are fixedly arranged on the inner bottom wall of the vibration isolator, and the upper ends thereof correspond to the corresponding damping springs. The upper covers of the two upper covers are connected with each other, sleeves are installed on the lower surfaces of the two upper covers, sliding sheets are welded on the upper ends of each of the spring rods, and the two sliding sheets are slidably arranged in the corresponding sleeves.

Beneficial effects of the present invention:

1. By setting up elastic devices composed of vibration isolators, spring rods, shock-absorbing springs, sleeves, sliding vanes and other devices, under normal working conditions, the load of the nuclear power plant pipeline system, including self-gravity and thermal expansion force, is determined by the elastic device. The prestressed load of the vibration isolator is consistent with this load. Therefore, under the action of elastic force, the nuclear power plant pipeline is kept in a state of force balance, so that the amplitude of the pipeline is controlled within 1mm-2mm, so as to avoid fatigue damage and damage to the pipeline. The problem of excessive vibration and noise of the device.

2. By setting up a rigid device composed of supporting parts, adjusting gaskets, connecting parts, limiters, connecting pins and other devices, it can play a rigid supporting role for the pipeline system. Under special working conditions, such as earthquakes and rainstorms Under such abnormal conditions, the load of the pipeline system becomes particularly large, and the vibration isolator and elastic device cannot bear the sudden increase of load. Under the action of the supporting parts, the safety of the pipeline system can be ensured.

3. The connecting piece and the supporting piece are fixed to each other by stud bolts, which can not only make the two share a large load, but also easily disassemble and separate the connecting piece and the supporting piece during maintenance, which is convenient for the replacement of various parts and components, and supports at the same time. The parts and the upper cover are fixedly connected by countersunk screws, which can not only ensure that the two will not have relative displacement during the vibration process, but also will not affect the normal installation of the sleeve.

4. The elastic device and the rigid device on the vibration isolation bracket can be automatically switched according to different loads. Under normal working conditions, the connecting pin and the pin hole are not in contact, the elastic device plays the role of vibration isolation, and the vibration isolator is relatively The large stiffness can ensure that the amplitude of the piping system is small. When the displacement of the bracket exceeds the gap between the connecting pin and the pin hole under abnormal working conditions, the connecting pin and the pin hole are in contact, and the rigid device acts as a support. The effect of the load, through the automatic switching between the elastic device and the rigid device, can fully ensure the safety of the pipeline system.

5. The vibration isolators, support rods, and pipe clamps in the device are all structures on the existing vibration isolation brackets. The rigid device can be directly installed on the original vibration isolation bracket, and the parts in the rigid device are simple in shape and easy to use. For production and manufacturing, it is only necessary to install the rigid device on the original vibration isolation bracket through bolts, screws and other hardware. It is easy to assemble and suitable for various specifications of pipeline shock absorption.

To sum up, the structure of the present invention is simplified, and the functional components used in the device can be additionally installed on the basis of not destroying the structure of the original bracket, thereby reducing the cost of design and production. In addition, the vibration isolation bracket not only has good vibration isolation In special working conditions, it also has the function of rigid support to improve the safety factor of the pipeline system.

Description of drawings

1 is a schematic structural diagram of a vibration isolation support for a nuclear power plant proposed by the present invention;

Fig. 2 is an enlarged view at A in Fig. 1;

FIG. 3 is a schematic structural diagram of a vibration isolator part in a vibration isolation bracket of a nuclear power plant proposed by the present invention.

In the picture: 1 pipe, 2 pipe clamp, 3 support rod, 4 bottom plate, 5 stud bolts, 6 adjusting backing plate, 7 upper cover, 8 vibration isolator, 801 spring rod, 802 damping spring, 803 sleeve, 804 Slide, 9 limiter, 901 pin hole, 10 mounting plate, 11 support, 12 connecting pin, 13 countersunk head screw, 14 connecting piece.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.

Referring to Figures 1-3, a vibration isolation support for a nuclear power plant includes a pipeline 1, a pipe clamp 2, a support rod 3 and a bottom plate 4. The lower part of the bottom plate 4 is provided with a vibration isolation mechanism. The vibration isolation mechanism includes an elastic device and a rigid device. The device includes a limiter 9 and two connecting pieces 14 symmetrically welded on the bottom of the bottom plate 4. Each connecting piece 14 is fixedly connected with a supporting piece 11 through a stud bolt 5, which is convenient for the replacement and maintenance of the connecting piece 14. The bolts 5 are not easy to wear when disassembled, and the connection strength and tightness can be ensured after long-term use or multiple disassembly, and an adjustment pad 6 is provided between the bottom end of each connection piece 14 and the support piece 11, and the adjustment pad The specifications of 6 can be replaced. The upper end of the stopper 9 is provided with a pin shaft hole 901 and a connecting pin shaft 12 is inserted in the pin shaft hole 901. The function of the adjusting backing plate 8 is mainly to adjust the gap between the connecting pin shaft 12 and the pin shaft hole 901, so that the gap is guaranteed to be 2 mm.

In the present invention, the inner diameter of the pin hole 901 is 4.5mm-5.5mm larger than the outer diameter of the connecting pin 12. Under normal working conditions, the pin hole 901 and the connecting pin 12 are not in contact with each other. The vibrator 8 plays the role of vibration isolation, and the gap between the inner wall of the pin shaft hole 901 and the outer wall of the connecting pin shaft 12 is 1.9mm-2.1mm, because when the bracket is installed in the cold state of the pipeline 1, the effect of thermal expansion load needs to be considered , so the displacement of the vibration isolator 8 can be considered in advance when installing the bracket. For example, the pre-compression force of the vibration isolator 8 is 10kN, the stiffness is 5kN/mm, and the thermal expansion load is 5kN after mechanical calculation. The shaft hole 901 and the axis of the connecting pin 12 are staggered by 1mm and installed. When the pipeline 1 enters the normal working condition, under the action of the thermal expansion load of the pipeline 1, the axis of the pin hole 901 and the connecting pin 12 will automatically coincide to ensure that the two The gap between them is stabilized at 2mm, so that the elastic device on the bracket acts as a shock isolation.

The elastic device includes a vibration isolator 8 and two upper covers 7 movably connected to the vibration isolator 8. Each support member 11 is fixedly connected to the corresponding upper cover 7. The bottom of the vibration isolator 8 is fixedly connected with a mounting plate 10. The plate 10 is used for the overall fixing of the bracket, and the mounting plate 10 can be welded or bolted to the embedded parts to maintain the stability of the bracket.

The pipe clamp 2 is sleeved on the outer side of the pipe 1, and there is no relative sliding between the two, the upper end of the support rod 3 is fixedly connected with the outer side wall of the pipe clamp 2, and the lower end of the support rod 3 is fixedly connected with the upper surface of the bottom plate 4. The support rod 3 plays the role of connecting the pipe clamp 2 and the bottom plate 4 .

The vibration isolator 8 includes two spring rods 801 and two damping springs 802 that are symmetrically arranged, and each spring rod 801 is located in the middle of the corresponding damping spring 802, and the lower end of each damping spring 802 is fixedly arranged in the middle. On the inner bottom wall of the vibration isolator 8, and its upper end is connected with the corresponding upper cover 7, the lower surfaces of the two upper covers 7 are equipped with a sleeve 803, and the upper end of each spring rod 801 is welded with a sliding piece 804, In addition, the two sliding pieces 804 are slidably arranged in the corresponding sleeve 803, and the spring rod 801 can prevent the shock-absorbing spring 802 from being unstable during movement.

When the present invention is used, first select a suitable vibration isolator 8 according to the calculation results of pipeline mechanics. Assuming that the load is 10kN under normal working conditions, it is necessary to select a vibration isolator with a pre-compression force of 10kN and a stiffness of 5kN/mm 8. Then install the vibration isolation bracket. First, weld the bottom end of the support rod 3 and the upper surface of the bottom plate 3 together, then set the pipe clamp 2 on the outside of the pipe 1, and connect the pipe clamp 2 to the support according to the requirements. The rods 3 are fixedly connected together;

Taking the vibration isolator 8 with the above parameters as an example, the vibration isolator 8 should be preloaded with a load of 10kN, then assembled with the mounting plate 10, and the mounting plate 10 should be welded or bolted to the embedded part, and then Carry out the installation of rigid devices;

Install the support 11 and the corresponding adjusting pad 6. It is worth noting that the height of the adjusting pad 6 can be changed as required, and then remove the preload limiting device on the vibration isolator 8, so that the assembly 8 is in a normal working state ;

Change the height of the adjusting pad 6, insert the connecting pin 12 into the pin hole 901, and make the two coaxial, and then fix both ends of the connecting pin 12 on the connecting pieces 14 on both sides, using stud bolts 5. Fix the corresponding connector 14 and the support 11 to complete the installation of the vibration isolation bracket;

It is worth noting that when the bracket is installed in the cold state of the pipe 1, the axis between the connecting pin 12 and the pin hole 901 can be staggered by 1mm, because the pipe 1 has no thermal expansion load at this time. If the thermal expansion load is 5kN , the pre-compression force of the vibration isolator 8 is 10kN, the stiffness is 5kN/mm, the pin hole 901 and the axis of the connecting pin 12 are staggered by 1mm to install, when the pipeline 1 enters the normal working condition, the thermal expansion load in the pipeline 1 Under the action of , the axis of the pin hole 901 and the connecting pin 12 will automatically coincide to ensure that the gap between the two is stable at 2mm.

Under normal conditions, the load of the pipeline system of the nuclear power plant includes self-gravity and thermal expansion force, which is borne by the elastic device. The prestressed load of the vibration isolator 8 is consistent with this load. The specifications and models of the existing vibration isolators 8 are all different. It is very rich and only needs to be selected according to the weight of the load. Under the action of elastic force, the nuclear power plant pipeline 1 is kept in a state of force balance, and the greater stiffness of the vibration isolator 8 can control the amplitude of the pipeline 1 within 1mm-2mm inside, to avoid problems such as fatigue damage to the pipeline 1 and excessive vibration and noise of the device, and the outer side wall of the connecting pin 12 and the inner side wall of the pin hole 901 will not touch each other;

Under special working conditions, such as earthquakes, rainstorms and other abnormal conditions, the load of the pipeline system becomes particularly large, and the vibration isolator 8 and the elastic device cannot withstand the sudden increase of the load, and the connecting pin 12 is in contact with the pin hole 901. The limiter 9 plays a load-bearing role, because the limiter 9 is fixedly connected with the mounting plate 10, and the mounting plate 10 is fixedly connected with the embedded parts, so the pressure on the pipeline 1 can be transferred to the embedded parts, and the pressure on the pipe 1 can be transferred to the embedded parts. Under the joint action of the component 14, the support rod 3 and the support component 11, the safety of the pipeline system can be ensured.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (5)

1. A vibration isolation support for a nuclear power plant, comprising a pipeline (1), a pipe clamp (2), a support rod (3) and a bottom plate (4), wherein the bottom of the bottom plate (4) is provided with a vibration isolation mechanism , the vibration isolation mechanism includes an elastic device and a rigid device, the rigid device includes a limiter (9) and two connecting pieces (14), each of the connecting pieces (14) is fixedly connected with a support piece (11) ), and an adjustment pad (6) is provided between the bottom end of each connecting piece (14) and the support piece (11), the upper end of the stopper (9) is provided with a pin shaft hole (901) and A connecting pin (12) is inserted, and both ends of the connecting pin (12) are respectively fixedly connected with the corresponding connecting pieces (14). 2. The vibration isolation support for a nuclear power plant according to claim 1, wherein the inner diameter of the pin shaft hole (901) is 4.5mm-5.5mm larger than the outer diameter of the connecting pin shaft (12), and the pin The gap between the inner wall of the shaft hole (901) and the outer wall of the connecting pin shaft (12) is 1.9mm-2.1mm. 3. The vibration isolation support of a nuclear power plant according to claim 1, wherein the elastic device comprises a vibration isolator (8) and two upper covers (7) movably connected with the vibration isolator (8) , each of the supporting pieces (11) is fixedly connected with the corresponding upper cover (7). 4. The vibration isolation support for a nuclear power plant according to claim 1, wherein the pipe clamp (2) is sleeved on the outside of the pipe (1), and the upper end of the support rod (3) is connected to the pipe clamp (2) The outer side walls are fixedly connected, and the lower end of the support rod (3) is fixedly connected with the upper surface of the bottom plate (4). 5 . The vibration isolation support for a nuclear power plant according to claim 3 , wherein the vibration isolator ( 8 ) comprises two spring rods ( 801 ) and two damping springs ( 802 ) that are symmetrically arranged, 5 . The upper end of each of the shock-absorbing springs (802) is connected to the corresponding upper cover (7), and sleeves (803) are installed on the lower surfaces of the two upper covers (7). The upper ends of 801) are welded with sliding pieces (804), and the two sliding pieces (804) are slidably arranged in the corresponding sleeves (803).

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