Vibration damping device and transformer vibration damping method

technical field

[0001] The invention belongs to the field of electrical appliances. In particular to a vibration damping device and a transformer vibration damping method.

background art

[0002] In recent years, large transformers have been increasingly used in residential and public places, which has put forward certain requirements on the noise of large transformers and small and medium-sized transformers. The noise problem of transformers is attracting more and more attention. The audible noise emitted by the transformer is caused by magnetostrictive deformation of the core and electromagnetic forces in the windings, fuel tanks and magnetic shields. Specifically, there are three sound sources for transformer noise, one is the core, the other is the windings, and the third is the cooler, which is the sum of the noise caused by no load, load and cooling system. The reason why the iron core produces noise is that the silicon steel sheets that make up the iron core will undergo slight changes under the action of the alternating magnetic field, namely magnetostriction. The magnetostriction causes the iron core to vibrate periodically with the change of the excitation frequency. The reason for the vibration of the windings is that the current produces electromagnetic force in the windings, and the leakage magnetic field can also cause the structural parts to vibrate. In order to solve the noise problem of transformers, the usual technical solution is to install the transformer in a frame with sound insulation effect, but only weaken part of the low-frequency noise transmitted by the air, while the transformer relies on building structures such as floors. That part of the low-frequency noise still cannot be solved.

summary

[0003] Aiming at the above-mentioned shortcomings, the present invention provides a vibration damping device and a vibration damping method for a transformer that have a simple structure and can greatly attenuate low-frequency noise.

[0004] In order to achieve the above technical purposes, the following technical solutions are used:

[0005] A vibration damping device comprises a vibration damping layer 1, a vibration damping layer 2 and a vibration support, wherein the vibration damping layer 1 comprises a base 1 with a cavity, a base 2 with a cavity and a concave vibration cover, the cavities of the base 1 and the base 2 are respectively provided with a vibration damping rubber pad 1 and a vibration damping rubber pad 2 higher than the cavity, and the concave vibration cover covers the vibration damping rubber pad 1 and the vibration damping rubber pad 2, and connects the base 1 and the base 2 into a whole. A damping layer 2 is arranged on the concave part of the concave vibration cover; the damping layer 2 comprises a first support with a chamber, a second support with a chamber, a vibration cover 1 and a vibration cover 2, a damping rubber pad 3 and a damping rubber pad 4 higher than the chamber are respectively arranged in the cavities of the first support and the second support, and the vibration cover 1 and the vibration cover 2 cover the damping rubber pad 3 and the damping rubber pad 4 respectively; The vibration support comprises a vibration base and a support cover with a vibration damping cavity, the vibration base and the support cover are fixedly connected, and the vibration cover 1 and the vibration cover 2 are fixedly connected with the vibration base respectively.

[0006] The vibration damping rubber pad 1, the vibration damping rubber pad 2, the vibration damping rubber pad 3 and the vibration damping rubber pad 4 respectively use a two-layer series structure to further improve the vibration damping effect.

[0007] The vibration damping rubber pad 1, the vibration damping rubber pad 2, the vibration damping rubber pad 3 and the vibration damping rubber pad 4 respectively use a three-layer series structure to further improve the vibration damping effect.

[0008] Two transformer vibration damping methods include: using two groups of any of the above vibration damping devices to be respectively arranged under both sides of the transformer, and adopting a non-fastening suspension connection method to improve the rigidity transmission between the transformer and the building.

[0009] In order to make the present invention more practical, further improvements are made as follows:

[0010] A vibration damping method for a transformer, further comprising:

[0011] Make an alloy sound-absorbing and sound-insulating ceiling on the ceiling of the transformer room to reduce the standing wave effect of indoor reverberation and the transmission of air sound through the floor to the upper floor.

[0012] Vibration isolation treatment shall be carried out in the parts where high and low voltage cables are laid underground and led to the distribution cabinet.

[0013] The high-voltage cable introduction part of the transformer uses high-elastic vibration isolation pads and special rubber shock absorbers for the bracket to isolate it from the bracket, so that the high-voltage cable and the bracket are flexibly connected to reduce the transmission of vibration.

[0014] The output part of the transformer's low-voltage line row is hoisted through suspension insulators, and a DJ type damping steel spring vibration damping hanger is installed between each suspension insulator and the ceiling to reduce the transmission of vibration of the low-voltage line row.

[0015] The output end of the transformer adopts soft connection.

[0016] The beneficial effects of the invention are that the vibration damping device has a simple structure and is convenient to install. When in use, it is installed under the transformer, adopts a double-layer composite vibration damping structure, and can disconnect the rigid transmission between the transformer and the building, thereby greatly reducing noise. The vibration reduction method disclosed by the invention has obvious vibration elimination, vibration isolation and noise reduction effects, reasonable steps, simple operation, and achieves the most effective environmental protection purpose of eliminating the noise transmitted by low-frequency vibration structures.

brief description of

[0017] Figure 1 is a schematic structural diagram of the present invention.

[0018] Figure 2 is a schematic diagram of the first structure of the section A-A of Figure 1.

[0019] Figure 3 is a schematic diagram of the second structure at section A-A of Figure 1.

[0020] Figure 4 is a schematic diagram of the third structure on section A-A of Figure 1.

[0021] Figure 5 is an enlarged view of Part B of Figure 2.

[0022] Reference numerals: base 1, 2-base 2, 3-concave vibration cover, 4-damping rubber pad 2, 5-damping rubber pad 1, 6-support 1, 7-support 2, 8-vibration cover 1, 9_Vibration cover 2, 10-vibration damping rubber 3, 11-vibration damping rubber 4, 12-vibration base, 13-support cover.

detailed description

[0023] As shown in FIGS. 1, 2 and 5, a vibration damping device comprises a vibration damping layer 1, a vibration damping layer 2 and a vibration support, wherein the vibration damping layer 1 comprises a base 1 with a chamber, a base 2 with a chamber, and a concave vibration cover 3. The cavities of the base 1 and the base 2 2 are respectively provided with a vibration damping rubber pad 1 and a vibration damping rubber pad 2 4 higher than the chamber. The concave vibration cover 3 covers the vibration damping rubber pad 1 and the vibration damping rubber pad 2 4. The base 1 and the base 2 are connected into one body, and the concave part of the concave vibration cover 3 is provided with a damping layer 1; the damping layer 1 includes the support 1 with a chamber 6, the support 2 with a chamber 7, the vibration cover 1 8 and the vibration cover 2 9. The vibration reduction rubber pad 3 10 and the vibration reduction rubber pad 4 11 are respectively arranged in the cavities of the support 1 6 and the support 2 7. The vibration cover 1 8 and the vibration cover 2 9 cover the vibration reduction rubber pad 3 10 and the vibration reduction rubber pad 4 11 respectively; The vibration support includes a vibration base I2 with a vibration damping cavity and a support cover 13. The vibration base 12 and the support cover I3 are fixedly connected. The vibration cover I 8 and the vibration cover II 9 are respectively fixedly connected to the vibration base 12.

[0024] As shown in Figure 3, the damping rubber pad I 5, the damping rubber pad II 4, the damping rubber pad III 10 and the damping rubber pad 011 respectively use two-layer series structures to further improve the damping effect.

[0025] As shown in Figure 4, the vibration damping rubber pad I 5, the vibration damping rubber pad II 4, the vibration damping rubber pad III 10 and the vibration damping rubber pad IV respectively use a three-layer series structure to further improve the vibration damping effect.

[0026] A transformer vibration reduction method, comprising:

[0027] The above two sets of vibration damping devices are respectively arranged below both sides of the transformer, and a non-fastening suspension connection method is adopted to improve the rigidity transmission between the transformer and the building.

[0028」_The high-voltage cable introduction part of the transformer is separated from the bracket by using high-elastic vibration isolation pads and special rubber shock absorbers for the bracket, so that the high-voltage cable and the bracket are flexibly connected to reduce the transmission of vibration.

[0029] The output part of the transformer's low-voltage line row is hoisted through suspension insulators, and a DJ type damping steel spring damping hanger is installed between each suspension insulator and the ceiling to reduce the transmission of vibration of the low-voltage line row.

[0030] Replace the four copper bars of the transformer with prepared vibration isolation copper buses of the same parameters.

[0031] Vibration reduction treatment shall be carried out for fixed points (vibration transmission points) of all lines.

[0032] Make an aluminum alloy sound-absorbing and sound-insulating ceiling on the ceiling of the transformer room to reduce the standing wave effect of indoor reverberation and the transmission of air sound through the floor to the upper floor.

[0033] Vibration isolation treatment shall be carried out when high and low voltage cables are laid underground and led to the distribution cabinet.

[0034] The vibration reduction device has a simple structure and is easy to install. When in use, it is installed under the transformer. It adopts a double-layer composite vibration reduction structure, which can disconnect the rigid transmission between the transformer and the building, thereby greatly reducing noise. The vibration reduction method using the vibration reduction device has significant vibration elimination, vibration isolation and noise reduction effects, reasonable steps, simple operation, and achieves the most effective environmental protection purpose of eliminating the noise transmitted by low-frequency vibrating structures.