Wide-frequency-domain rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction

Abstract

The invention belongs to the field of nuclear power station unit pipeline vibration absorption, and particularly relates to a wide-frequency-domain rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction, the vibration absorber comprises fixing frames and a vibration absorption block, the fixing frames are of circular structures, the two fixing frames are arranged in parallel and symmetrically, the vibration absorption block is located between the two fixing frames, and the vibration absorption block is arranged between the fixing frames. A plurality of vibration absorption blocks are evenly arranged in the circumferential direction of the fixing frames, the two ends of each vibration absorption block are detachably connected with the two fixing frames respectively, certain gaps are reserved between the two ends of each vibration absorption block and the corresponding fixing frame, and the fixing frames are connected with the pipeline in a fastened mode. The pipeline is clamped through the fixing frame, the fixing frame bears vibration of the pipeline and transmits the vibration to the vibration absorption block, vibration absorption is completed through the vibration absorption block, and vibration of the pipeline is restrained. The vibration absorber is simple in structure, convenient to disassemble and assemble and capable of effectively restraining vibration from the pipeline in all directions.

Description

Technical Field

[0001] The invention belongs to the field of nuclear power plant unit pipeline vibration absorption, and in particular relates to a wide-frequency rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction. Background Art

[0002] The pipeline system of a power plant is a complex dynamic structure. During normal operation of the unit, there are a large number of vibration sources in the internal system of the pipeline, such as pressure pulses when the valve is opened or closed or changes in the opening of the regulating valve, as well as various equipment connected to the pipeline system, such as pumps, turbines, fans and other power sources. These vibrations can transmit vibrations, which will produce excessive displacement and stress, damage the pipeline system, and even cause malfunctions of key sensitive facilities.

[0003] Therefore, there is an urgent need to invent a pipeline vibration absorber that can perform multi-directional vibration suppression based on the characteristics of pipeline vibration of nuclear power plant units. Summary of the invention

[0004] The object of the present invention is to provide a wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction. The vibration absorber has a simple structure and is easy to assemble and disassemble, and can effectively suppress vibrations from all directions of the pipeline.

[0005] The technical solution to achieve the purpose of the present invention is:

[0006] A wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction, the vibration absorber comprising: a fixing frame and a vibration absorbing block, the fixing frame is a circular structure, two groups of fixing frames are arranged in parallel and symmetrically, the vibration absorbing block is located between the two groups of fixing frames, and a plurality of vibration absorbing blocks are evenly arranged along the circumferential direction of the fixing frame, the two ends of the vibration absorbing block are respectively detachably connected to the two groups of fixing frames, a certain gap is left between the two ends of the vibration absorbing block and the fixing frame, and the fixing frame is tightly connected to the pipeline; the fixing frame clamps the pipeline, the fixing frame bears the vibration of the pipeline and transmits the vibration to the vibration absorbing block, the vibration absorption is completed by the vibration absorbing block, and the vibration of the pipeline is suppressed.

[0007] Furthermore, the vibration absorbing block is detachably connected to the two sets of fixing frames via studs.

[0008] Furthermore, the fixing frame is two symmetrical semicircular structures, and the two semicircular structures are detachably connected to form a circular structure.

[0009] Furthermore, the two semicircular structures are detachably connected by bolts.

[0010] Furthermore, the vibration absorbing block includes a rubber ring and a metal block, the rubber ring is embedded in both ends of the metal block, and after the vibration absorber is installed, the rubber ring is located between the metal block and the fixing frame.

[0011] Furthermore, the material of the metal block is tungsten-based heavy alloy.

[0012] Furthermore, the rubber ring is made of chloroprene rubber.

[0013] Furthermore, the fixing frame is made of structural steel.

[0014] The beneficial technical effects of the present invention are:

[0015] 1. The wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction provided by the present invention can effectively suppress the low-frequency vibration of the pipeline and realize the vibration absorption function of the pipeline.

[0016] 2. The invention provides a wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction. The dynamic vibration absorber has a good suppression effect on low frequencies and has a high application value for pipeline vibration absorption.

[0017] 3. In the wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction provided by the present invention, the fixing frame adopts a parallel installation structure, has a certain rigidity, and has a certain supporting effect on the pipeline.

[0018] 4. The invention provides a wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction, which can effectively suppress pipeline vibration by designing a rubber ring in the vibration absorbing block.

[0019] 5. The invention provides a wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction. Compared with other vibration absorbers, the embedded rubber ring replaces the spring damper to transmit vibration, which can reduce the vibration amplitude of the metal block on the one hand and make the structure more compact on the other hand.

[0020] 6. The invention provides a wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction. Since the metal block can make small displacements in the axial and lateral directions and four groups of vibration absorbing blocks are installed in parallel, the vibration absorber can effectively suppress axial and lateral vibrations.

[0021] 7. The wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction provided by the present invention has a quadruple vibration absorber structure, can absorb a large frequency range, effectively suppresses multi-directional vibrations, and eliminates the tedious steps of frequency modulation.

[0022] 8. The wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction provided by the present invention adopts a pipe clamp installation method, has a compact structure, light weight, simple structure, and is easy to assemble and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction provided by the present invention;

[0024] Figure 2 The present invention is a cross-sectional view of a vibration absorbing block in a wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction provided by the present invention.

[0025] In the figure: 1, fixing frame; 2, vibration absorbing block; 3, stud; 2-1, rubber ring; 2-2, metal block. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 As shown, a wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction provided by the present invention comprises: a fixing frame 1, a vibration absorbing block 2, and a stud 3.

[0028] The fixing frame 1 is a circular structure, and the material of the fixing frame 1 is structural steel. The two sets of fixing frames 1 are arranged in parallel and symmetrically, the vibration absorbing block 2 is located between the two sets of fixing frames 1, and a plurality of vibration absorbing blocks 2 are evenly arranged along the circumference direction of the fixing frame 1, and the vibration absorbing block 2 is detachably connected to the two sets of fixing frames 1 through studs 3.

[0029] The fixing frame 1 is two symmetrical semicircular structures, which are detachably connected by bolts to form a circular structure. The fixing frames 1 of the two semicircular structures are fastened to the pipeline by bolts. The fixing frames 1 have a certain rigidity and can support the pipeline. There is a certain gap between the two ends of the vibration absorbing block 2 and the fixing frame 1. When vibration occurs, the vibration absorbing block 2 can produce a small movement, so that it has the freedom of axial movement.

[0030] In a specific implementation, four vibration absorbing blocks 2 are symmetrically distributed between two groups of fixing frames 1, which can ensure that vibrations from various locations of the pipeline can be absorbed.

[0031] like Figure 2 As shown, the vibration absorbing block 2 includes a rubber ring 2-1 and a metal block 2-2. The material of the metal block 2-2 is tungsten-based heavy alloy, and the material of the rubber ring 2-1 is chloroprene rubber. The rubber ring 2-1 is embedded in both ends of the metal block 2-2. After the vibration absorber is installed, the rubber ring 2-1 is located between the metal block 2-2 and the fixing frame 1. There is friction between the rubber ring 2-1 and the stud 3, and between the rubber ring 2-1 and the metal block 2-2. When the vibration of the pipeline occurs, the fixing frame 1 has a certain supporting effect, which limits the displacement of the pipeline to a certain extent. At the same time, the vibration of the pipeline will be transmitted to the metal block 2-2, and the metal block 2-2 will squeeze the rubber ring 2-2, and the metal block 2-2 will produce a small displacement. The characteristics of the rubber ring 2-1 ensure that the displacement of the metal block 2-2 will not be too large, and at the same time dissipate energy to achieve the effect of vibration absorption.

[0032] When vibration occurs, the fixing frame 1 will bear a certain load, and the fixing frame 1 will transmit the vibration to the metal block 2-2, the metal block 2-2 will squeeze the rubber ring 2-1, and the rubber ring 2-1 will displace the metal block 2-2 to achieve the effect of vibration absorption.

[0033] Compared with the spring-mass block combination of other vibration absorbers, the combination of the rubber ring 2-1 and the metal block 2-2 has an embedded structure of the rubber ring, which enables the metal block to complete vibration absorption under smaller displacement, making the structure more stable and compact.

[0034] The invention provides a wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction, and its working principle is as follows:

[0035] like Figure 1-2 As shown, each vibration absorbing block 2 is a vibration absorbing unit. Since a gap is left when the vibration absorbing block 4 is installed, axial and lateral displacements can be generated. The vibration absorbing block 2 includes a rubber ring 2-1 and a metal block 2-2. The rubber ring 2-1 is embedded at both ends of the metal block 2-2, so that the vibration absorber can maintain balance when there is no vibration. Since the rubber ring 2-1 is embedded in the metal block 2-2, the rubber ring 2-1 will hinder the displacement of the metal block 2-2, so that the displacement of the metal block will not be too large. At the same time, the rubber ring has a vibration absorbing effect, which can suppress the low-frequency vibration of the pipeline. When the pipeline vibrates, since the fixing frame 1 is divided into two groups and is installed in parallel on the pipeline, vibrations in all directions can be transmitted. Since the fixing frame 1 is tightly connected to the pipeline, the pipeline and the fixing frame 1 are relatively static, and the vibration is transmitted to the vibration absorbing block 2. The metal block 2-2 will vibrate due to the gap. The rubber ring 2-1 will absorb the vibration, so that the vibration of the metal block 2-2 is reduced, achieving the effect of vibration absorption. Therefore, the dynamic vibration absorber suppresses the low-frequency vibration of the pipeline and has a good vibration suppression effect.

[0036] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction, characterized in that: The vibration absorber comprises: a fixing frame (1) and a vibration absorbing block (2); the fixing frame (1) is a circular structure; two groups of fixing frames (1) are arranged in parallel and symmetrically; the vibration absorbing block (2) is located between the two groups of fixing frames (1); and a plurality of vibration absorbing blocks (2) are evenly arranged along the circumferential direction of the fixing frame (1); the two ends of the vibration absorbing block (2) are respectively detachably connected to the two groups of fixing frames (1); a certain gap is left between the two ends of the vibration absorbing block (2) and the fixing frame (1); the fixing frame (1) is tightly connected to the pipeline; the fixing frame (1) clamps the pipeline, the fixing frame (1) bears the vibration of the pipeline and transmits the vibration to the vibration absorbing block (2); the vibration absorption is completed by the vibration absorbing block (2), and the vibration of the pipeline is suppressed.

2. A wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction according to claim 1, characterized in that: The vibration absorbing block (2) is detachably connected to the two sets of fixing frames (1) via stud bolts (3).

3. The wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction according to claim 1 is characterized in that: The fixing frame (1) is composed of two symmetrical semicircular structures, which are detachably connected to form a circular structure.

4. A wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction according to claim 3, characterized in that: The two semicircular structures are detachably connected via bolts.

5. The wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction according to claim 1 is characterized in that: The vibration absorbing block (2) comprises a rubber ring (2-1) and a metal block (2-2); the rubber ring (2-1) is embedded at both ends of the metal block (2-2); after the vibration absorber is installed, the rubber ring (2-1) is located between the metal block (2-2) and the fixing frame (1).

6. A wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction according to claim 5, characterized in that: The material of the metal block (2-2) is tungsten-based heavy alloy.

7. The wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction according to claim 5 is characterized in that: The material of the rubber ring (2-1) is chloroprene rubber.

8. The wide-band rubber spring dynamic vibration absorber for nuclear power pipeline vibration reduction according to claim 1 is characterized in that: The material of the fixing frame (1) is structural steel.

Images