Composite vibration isolation base

Abstract

The present invention discloses a composite vibration isolation base, which uses secondary vibration isolation structure technology, including an upper steel plate frame groove and an upper vibration damper of a primary vibration isolation structure, and a lower steel plate frame groove and a lower vibration damper of a secondary vibration isolation structure. The upper steel plate frame groove is embedded in the lower steel plate frame groove, and the upper vibration damper is reliably installed between the upper steel plate frame groove and the bottom plate of the lower steel plate frame groove, and the lower vibration damper is between the lower steel plate frame groove and the ground around. The upper steel plate frame groove is provided with threaded steel welded installation equipment anchor bolts, which are poured with concrete to form an upper rigid mass block. The lower steel plate frame groove is in the shape of an integral bottom plate, and is surrounded by a peripheral steel plate frame groove. The peripheral steel plate frame groove is provided with threaded steel, which is poured with concrete to form a lower rigid mass block. The height of the secondary vibration isolation structure is reduced, resonance and equipment displacement are controlled, and the solid transmission of equipment structure vibration is effectively reduced.

Description

Technical Field

[0001] The invention relates to a composite vibration isolation base for controlling and modifying equipment vibration noise and preventing equipment vibration from being transmitted to solids. Background Art

[0002] With the increasing number of electromechanical equipment in buildings, the impact of low-frequency solid noise pollution caused by equipment vibration on people's physical and mental health has been confirmed. Therefore, since 2008, the Ministry of Environmental Protection has included indoor low-frequency noise control technology in the "Catalogue of Environmental Protection Technologies Encouraged by the State" every year. Technology name: Indoor low-frequency noise and solid sound pollution control equipment and integrated control technology. Technology content: This technology uses various vibration isolation systems such as high-efficiency low-frequency vibration isolation devices and vibration isolation foundations based on low-frequency noise and solid sound analysis and identification technology to control indoor noise. The vibration isolation efficiency is >95% in a wide frequency band. The integrated control technology can reduce indoor low-frequency noise (below 200Hz) and solid sound by more than 10dB. Scope of application: Low-frequency noise and solid sound pollution control in urban civil buildings and public buildings.

[0003] The main propagation mode of equipment vibration noise is structural noise transmitted through the building structure in the form of low-frequency vibration. Reducing the vibration transmission of the equipment is achieved by eliminating the rigid connection between them. The current solution to the problem is to configure a vibration isolation base composed of a rigid mass block and a vibration isolator between the equipment and the building structure. Since the equipment is in the startup and shutdown stages, at a certain stage in the process of the speed changing from 0 to the rated speed, it is inevitable that the natural frequency of the damping spring vibration isolator will be consistent with the disturbance frequency of the rotating equipment, resulting in resonance and vibration isolation failure. In certain occasions where the vibration isolation requirements for equipment are very high, when the primary vibration isolation cannot meet the vibration isolation requirements, secondary vibration isolation is required. The vibration transmission of the secondary vibration isolation structure is further attenuated on the basis of the vibration transmission of the primary vibration isolation structure, thereby making the transmission ratio smaller and the vibration isolation effect better.

[0004] The transmissibility of vibration is inversely proportional to the fourth power of the interference frequency, that is, the double-layer vibration isolation system has a better vibration isolation effect on high-frequency vibrations. The double-layer vibration isolation system has two natural frequencies. In the frequency band above the second natural frequency, the vibration transmissibility of the double-layer vibration isolation system decreases rapidly as the frequency increases, and the vibration isolation effect is better than that of the primary vibration isolation system. However, in the medium and low frequency bands, due to the existence of two natural frequencies, the vibration isolation effect deteriorates, especially near the second natural frequency. In addition, as m1 decreases, the speed of reduction of the high-frequency band transmissibility tends to increase, which improves the high-frequency isolation ability of the system; however, the natural frequency also moves to the low frequency, and the corresponding peak value also rises rapidly, which will deteriorate the medium and low frequency vibration isolation ability of the system and reduce the vibration isolation efficiency.

[0005] If the secondary vibration isolation structure is set up by superimposing the primary and secondary vibration isolation structures, the total height of the vibration isolation structure will be increased, the center of gravity of the equipment will be increased, and the operating stability will be affected. If the primary and secondary vibration isolation structures are set up in an inlaid manner, the effective installation table specifications will be insufficient and the adaptability range will be narrow. Summary of the invention

[0006] In order to overcome the shortcomings of equipment secondary vibration isolation structure, which will increase the overall height of the equipment, cause resonance and cause equipment startup displacement, the purpose of the present invention is to provide a composite vibration isolation base with a low overall height, which can eliminate resonance and effectively control the displacement of the equipment during startup and shutdown stages.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a composite vibration isolation base using secondary vibration isolation structure technology, including an upper steel plate frame groove and an upper rubber shear vibration damper of a primary vibration isolation structure, a lower steel plate frame groove and a lower adjustable damping spring vibration isolator of a secondary vibration isolation structure, the upper steel plate frame groove is embedded in the lower steel plate frame groove, the upper rubber shear vibration damper is reliably installed between the upper steel plate frame groove and the bottom plate of the lower steel plate frame groove, and the lower adjustable damping spring vibration isolator is between the lower steel plate frame groove and the floor around. The upper steel plate frame groove is provided with a threaded steel welding installation device anchor bolt, and concrete is poured to form an upper rigid mass block. The lower steel plate frame groove is in the shape of an integral bottom plate, and the surroundings are peripheral steel plate frame grooves. The peripheral steel plate frame groove is provided with threaded steel, and concrete is poured to form a lower rigid mass block.

[0008] Setting the steel plate frame groove to reduce the weight of the composite vibration isolation base can greatly reduce the transportation and installation costs of the composite vibration isolation base, and can further improve the installation accuracy and vibration isolation efficiency. After the composite vibration isolation base is installed, concrete is poured on site.

[0009] The upper steel plate frame groove is in the shape of a cube or a chamfered platform at the bottom and a cube at the top. The top steel plate is folded outward at a 90° angle, and the cube is the equipment installation table. The upper steel plate frame groove is in the shape of a chamfered platform at the bottom and a cube at the top. On the premise of meeting the weight ratio of the upper rigid mass block, the effective area of ​​the equipment installation table is expanded. In order to ensure the structural strength of the anchor bolt installation position, the cube height of the upper steel plate frame groove is greater than 30mm to improve the structural rigidity of the upper rigid mass block.

[0010] The top steel plate of the peripheral steel plate frame groove is folded inward at an angle of 90°, and the outer corner of the top steel plate of the upper steel plate frame groove is on the inner corner of the top steel plate of the peripheral steel plate frame groove, and the distance between them is 150% of the static load compression deformation of the upper rubber shear damper.

[0011] The distance between the bottom plate of the lower steel plate frame groove and the floor is 150% of the static load compression deformation of the lower adjustable damping spring isolator.

[0012] The natural frequency of the upper rubber shear damper is 6-8 Hz, and the damping ratio is greater than 0.07; the natural frequency of the lower adjustable damping spring isolator is 2.5-4.5 Hz, and the damping ratio is greater than 0.02. The concrete is C30 commercial concrete, and the weight ratio of the upper rigid mass block to the lower rigid mass block is 1:1.8-2.5. Casting C30 concrete ensures the structural stiffness of the upper rigid mass block and the lower rigid mass block, and improves the uniformity of vibration transmission.

[0013] The upper rubber shear vibration isolator and the lower adjustable damping spring vibration isolator are both multiple and symmetrically arranged along the central axis of the composite vibration isolation base, and the load they bear is within the optimal load range.

[0014] The beneficial effects of the present invention are that the height of the secondary vibration isolation structure is reduced, resonance and equipment displacement phenomena are controlled, the weight ratio of the upper rigid mass block and the lower rigid mass block is defined, and the solid transmission of equipment structure vibration is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a front view cross-sectional structural diagram of the first embodiment of the composite vibration isolation base of the present invention.

[0017] Figure 2 yes Figure 1 Top view cross-sectional structure diagram.

[0018] Figure 3 yes Figure 1 Side view cross-sectional structure diagram.

[0019] Figure 4 It is a side sectional structural diagram of the second embodiment.

[0020] In the figure, 1. primary vibration isolation structure, 11. upper steel plate frame groove, 12. installation table, 13. outer corner, 14. upper rubber shear vibration damper, 2. secondary vibration isolation structure, 21. lower steel plate frame groove, 22. bottom plate, 23. peripheral steel plate frame groove, 24. inner corner, 25. lower adjustable damping spring vibration isolator, 3. equipment, 31. anchor bolts, 32. concrete, 33. floor. DETAILED DESCRIPTION

[0021] exist Figure 1 , 2In the first embodiment shown in FIG. 3 , the composite vibration isolation base includes an upper steel plate frame groove 11 and an upper rubber shear vibration damper 14 of a primary vibration isolation structure 1, a lower steel plate frame groove 21 and a lower adjustable damping spring vibration isolator 25 of a secondary vibration isolation structure 2. The upper steel plate frame groove 11 is embedded in the lower steel plate frame groove 21, the upper rubber shear vibration damper 14 is reliably installed between the bottom of the upper steel plate frame groove 11 and the bottom plate 22 of the lower steel plate frame groove 21, and the lower adjustable damping spring vibration isolator 25 is between the surrounding of the lower steel plate frame groove 21 and the floor 33. The upper steel plate frame groove 11 is provided with a threaded steel bar welding installation device 3 anchor bolt 31 and concrete 32 is poured to form an upper rigid mass block. The lower steel plate frame groove 21 is in the shape of an integral bottom plate 22 and is surrounded by a peripheral steel plate frame groove 23. The peripheral steel plate frame groove 23 is provided with a threaded steel bar and concrete 32 is poured to form a lower rigid mass block.

[0022] The upper steel plate frame tank body 11 is in the shape of a cube, which is an equipment installation table 12. The cube height of the upper steel plate frame tank 11 is greater than 30 mm, and the top steel plate is folded outwards 13 at an angle of 90 degrees.

[0023] The top steel plate of the peripheral steel plate frame groove 23 is bent inwardly at an angle of 90°. The outer corner 13 of the top steel plate of the upper steel plate frame groove 11 is on the inner corner 24 of the top steel plate of the peripheral steel plate frame groove 23, and the distance between them is 150% of the static load compression deformation of the upper rubber shear damper 14.

[0024] The distance between the bottom plate 22 of the lower steel plate frame groove 21 and the floor 33 is 150% of the static load compression deformation of the lower adjustable damping spring isolator 25 .

[0025] The natural frequency of the upper rubber shear damper 14 is 6-8 Hz, and the damping ratio is greater than 0.07; the natural frequency of the lower adjustable damping spring isolator 25 is 2.5-4.5 Hz, and the damping ratio is greater than 0.02. The concrete is C30 commercial concrete, and the weight ratio of the upper rigid mass block to the lower rigid mass block is 1:1.8-2.5.

[0026] The upper rubber shear vibration absorber 14 and the lower adjustable damping spring vibration isolator 25 are both multiple and symmetrically arranged along the central axis of the composite vibration isolation base, and the load they bear is within the optimal load range.

[0027] exist Figure 4 In the second embodiment shown, the upper steel plate frame groove 11 is shaped like a chamfered platform at the bottom and a cube at the top, and the cube is the equipment installation table 12.

[0028] On-site installation process of composite vibration isolation base:

[0029] 1 Select the composite vibration isolation base model according to the total load of the equipment 3 unit including the medium;

[0030] 2 Pop out the longitudinal and transverse axes of the equipment 3 on the floor 33, and determine the installation position of the composite vibration isolation base based on the axes;

[0031] 3 Install the base of the matching lower adjustable damping spring isolator 25 on the floor 33, and install the upper bolts in the bolt holes reserved in the composite vibration isolation base;

[0032] 4 The anchor bolts 31 of the base of equipment 3 are welded to the threaded steel bars in the upper steel plate frame groove 11; the center of gravity of the equipment 3 unit and its accessories and the center of the plane of the installation table 12 of the upper steel plate frame groove 11 are on the same vertical line;

[0033] 5 The length of the installation table 12 of the upper steel plate frame groove 11 should not be less than the length of the common base of the equipment 3 units; the width should not be less than the width of the common base of the equipment 3 units;

[0034] 6 Pour concrete 32 into the upward steel plate frame groove 11 and the peripheral steel plate frame groove 23 on site, and install the equipment 3 unit after the concrete 32 initially sets;

[0035] 7 Adjust the horizontal flatness deviation and height of the composite vibration isolation base by rotating the nut under the damping spring isolator 25.

[0036] The above embodiments are only used to further illustrate a composite vibration isolation base of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A composite vibration isolation base using secondary vibration isolation structure technology, comprising an upper steel plate frame groove and an upper rubber shear vibration damper of a primary vibration isolation structure, a lower steel plate frame groove and a lower adjustable damping spring vibration isolator of a secondary vibration isolation structure, characterized in that: The upper steel plate frame groove is embedded in the lower steel plate frame groove, the upper rubber shear vibration absorber is reliably installed between the upper steel plate frame groove and the bottom plate of the lower steel plate frame groove, and the lower adjustable damping spring vibration isolator is between the surrounding of the lower steel plate frame groove and the floor; the upper steel plate frame groove is provided with threaded steel welding installation equipment anchor bolts, and concrete is poured to form an upper rigid mass block; the lower steel plate frame groove is in the shape of an integral bottom plate, and is surrounded by a peripheral steel plate frame groove; threaded steel is poured in the peripheral steel plate frame groove to form a lower rigid mass block The top steel plate of the upper steel plate frame groove is folded outward at an angle of 90°, and the top steel plate of the peripheral steel plate frame groove is folded inward at an angle of 90°. The outer folding angle of the top steel plate of the upper steel plate frame groove is on the inner folding angle of the top steel plate of the peripheral steel plate frame groove, and the distance between them is 150% of the static load compression deformation of the upper rubber shear damper; the weight ratio of the upper rigid mass block and the lower rigid mass block is 1:1.8~2.5; concrete is poured into the upper steel plate frame groove and the lower steel plate frame groove on site, and the equipment unit is installed after the concrete is initially set.

2. According to claim 1, a composite vibration isolation base is characterized in that: The upper steel plate frame trough is in the shape of a cube or a chamfered platform at the bottom and a cube at the top, and the top is an equipment installation table.

3. According to claim 1, the composite vibration isolation base is characterized in that: The distance between the bottom plate of the lower steel plate frame groove and the floor is 150% of the static load compression deformation of the lower adjustable damping spring isolator.

4. The composite vibration isolation base according to claim 1, characterized in that: The natural frequency of the upper rubber shear vibration isolator is 6-8 Hz, and the damping ratio is greater than 0.07; the natural frequency of the lower adjustable damping spring vibration isolator is 2.5-4.5 Hz, and the damping ratio is greater than 0.

02.

5. The composite vibration isolation base according to claim 1, characterized in that: The upper rubber shear vibration isolator and the lower adjustable damping spring vibration isolator are both multiple and symmetrically arranged along the central axis of the composite vibration isolation base, and the load they bear is within the optimal load range.

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