JPS58277Y2 - Transformer soundproof cooling system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a soundproof cooling device for a transformer such as a self-cooling/air-cooling type and a self-cooling/air-cooling/oil-feeding air-cooling type transformer.

In general, the following are sources of noise in transformer cooling systems.

That is, there are (1) noises generated by transmission of vibrations from the transformer body, (2) pump noises, and (3) fan noises.

(1) Noise due to the transmission of vibrations from the transformer body can be prevented by using a vibration-proof joint in the communication pipe between the transformer body and the cooling device to prevent the transmission of vibrations.

Regarding the pump noise in (2), 5
A 0 dB class pump has been developed, but when multiple pumps are used, the noise value becomes high as a result of composite noise, and 55
In the case of noise regulations below dB, noise values are lowered by surrounding the building with soundproof walls.

Regarding the fan noise in (3), 48% as a low noise fan.
A dB class fan has been developed, but when multiple fans are used, the composite noise value becomes high, and separate soundproofing measures are required if the noise regulation is 55 dB or less.

Conventionally, as a soundproofing measure, the cooling fan itself has been reduced in noise as shown in FIG. 1, or the cooling device has been surrounded by a noise wall as shown in FIG.

This will be explained in detail below. Figures 1a and 1b are a plan view and a front view of essential parts, respectively, showing an example of a conventional soundproof cooling system for an oil-immersed transformer. ) side transformer tank, and the other end is connected to the upper and lower parts of the radiator 3, an upper connecting pipe and a lower connecting pipe, 4 is a radiator stand that supports the radiator 3, and 5 is a low-noise fan. It is.

Here, the insulating oil warmed by the heat generated by the transformer core and windings rises in the transformer tank, passes through the upper connecting pipe 1, and flows into the radiator 3.

The insulating oil is cooled by the air sent by the low-noise fan 5 in the radiator 3, returns to the transformer tank through the lower connecting pipe 2, is heated again by the heat generated by the iron core and the windings, and is circulated. There is.

In Figure 1, a low-noise cooling fan is used, and this structure is economical for medium-capacity transformers (about 15/20MVA and using 2 to 4 fans). In large transformers exceeding 30 MVA, the number of fans installed increases, resulting in increased synthetic noise, making it difficult to satisfy noise regulation values.

Methods for reducing the noise level of cooling fans include lowering the rotation speed or adjusting the twist angle of the blades to reduce wind noise.

In this case, a reduction in air flow and static pressure occurs. To prevent this, the blade diameter is increased to increase the amount of air blown, but compared to the normal type (70 dB), the amount of air blown is less than half of the low noise type (approximately 50 dB) when the static pressure is the same. As a result, the cooling capacity is reduced to less than half.

That is, compared to the normal type, the low-noise type requires more than twice the number of fans to cool the same amount of heat.

Therefore, the low-noise type has drawbacks such as a more complex control circuit, protection circuit, etc., and higher power consumption than the normal type.

Figures 2a and 2b are a plan view and a front view of main parts showing other examples of conventional soundproof cooling devices for oil-immersed transformers, respectively. A symbol is used.

In the figure, the cooling device is surrounded by a sound insulating wall 11, but in this case, due to the air intake, the 8 dimensions shown in the figure (the distance between the radiator 3 and the sound insulating wall 11) must be approximately 1 m or more. The height h dimension of the sound insulation wall 11 is also the same as that of the cooler (radiator 3).
) is required.

Also, as shown in the figure, it may be necessary to provide a hole 12 in the sound insulating wall 11 as an air intake hole, and attach a sound insulating cover 13 having a ventilation hole 13a to cover the hole 120 to create a ventilation duct for introducing air as shown by the arrow. Ta.

Note that in FIG. 2, arrows indicate air flow.

The present invention solves these conventional problems and provides an economical transformer with good heat dissipation efficiency, low noise, and a soundproof structure that allows for easy low-noise modification of the cooling system of existing transformers. The present invention aims to provide a soundproof cooling device, which will be explained below using examples.

Figures 3a and 3b are a schematic plan view showing an embodiment of a soundproof cooling device for an oil-immersed transformer according to the present invention, and Figure 3a in Figure 3a
- A cross-sectional view, in which 21 is a tank in which a transformer consisting of a winding 23 wound around an iron core 22 is immersed in insulating oil, and 24 is a tank that covers and envelops the transformer tank 21. 25.26 is the transformer tank 2
These bushing pockets 25 and 26 are provided on the upper surface of the soundproof wall or the building 24 and stand upright outside.

27 is an upper connecting pipe whose one end is connected to the bushing pocket 25 and the other end is connected to the upper inlet side of the radiator 28; and 29, one end is connected to the lower side of the transformer tank 21 by penetrating the soundproof wall or the building 24. and the other end is connected to the heatsink 2.
The upper connecting pipe 2γ and the lower connecting pipe 29 are provided with anti-vibration joints 30 and 31, respectively, to transmit vibrations from the transformer main body side. is prevented.

32 is a radiator stand for supporting the radiator 28; 33 is an oil pump installed in the lower connecting pipe 29 located at the bottom of the radiator 28; 34 is a cooling fan attached to the bottom of the radiator 28. By this cooling fan 34, the heat radiator 2
Air is blown onto the surface of the 8, increasing cooling efficiency.

Reference numeral 35 denotes a sound insulating wall having an opening 36 with an opening size of 100 mm on the transformer main body side.

This sound insulating wall 35 surrounds the entire circumference of the cooling device except for the opening 36 on the transformer main body side up to the height at which the cooling fan 34 is installed.

Therefore, the oil pump 33 and the cooling fan 34, which are sources of noise, are surrounded by the sound insulating wall 35 on the entire circumference except for the transformer main body side opening 36 side.

Here, a steel plate, concrete, etc. is used as the sound insulation wall 35, and its thickness is determined by the thickness of the cooling fan 34 and the oil pump 33.
It is calculated and determined based on the number of objects, noise value, and standard cliff sound value.

Further, as the sound insulating wall 35, a structure in which a sound absorbing material 38 is pasted to a steel plate 31 as shown in FIG. 4a, or a sound absorbing material 40 pasted to a concrete block 39 as shown in FIG.

Further, 41 is provided around the radiator 28 at a predetermined distance a' (80 to 150 mm) from the radiator 28, and has a height that covers about 7 of the lower part of the entire length of the radiator 28. This sound insulation board and wind insulation board 41 is a sound insulation board and wind insulation board.
is attached to the sound insulating wall 35.

The air flow is not dispersed in the lateral direction by the sound insulating plate/wind shielding plate 41, but rises almost vertically as shown by the solid arrow, thereby cooling the radiator 28.

In FIG. 3 configured in this way, the insulating oil heated by the heat generated by the transformer core 22 and winding 23 rises in the transformer tank 21 as indicated by the dotted arrow, and passes through the upper connecting pipe 2γ. and flows into the heat radiator 28.

The insulating oil cooled by the heat radiator 28 returns to the transformer tank 21 through the lower connecting pipe 29 as shown by the dotted arrow, and is heated again by the heat generated by the iron core 22 and the winding 23 and circulates.

Here, an oil feed pump 33 is provided to forcibly perform the circulation to improve cooling efficiency.

In addition, by the cooling fan 34 provided at the lower part of the radiator 28, air passes through the soundproof wall on the transformer main body side or the gap 42 between the building 24 and the soundproof wall 35 as shown by the solid arrow, and flows into the soundproof wall 35 from the opening 36. It is blown up perpendicularly to the surface of the radiator 28 and rises almost vertically along the surface of the radiator 28 without being dispersed laterally by the sound insulator/blast plate 41, making the cooling efficiency of the radiator 28 even better. .

Next, it is ideal for the soundproof structure shown in Fig. 3 to surround the entire circumference of the noise generator without any gaps, but from the standpoint of cooling, it is desirable that the area around the radiator 28 be as open as possible. be.

Therefore, in the present invention, the entire periphery of the oil pump 33 and cooling fan 34, which are sources of noise except for the transformer main body opening 36, is surrounded by a sound insulating wall 35 to improve the soundproofing effect and to allow cooling air to flow through the opening 36. The structure allows for free flow of water.

Noise leaking outward from the opening 36 on the transformer main body side is blocked by the soundproof wall or the building 24 on the transformer main body side, so there is no problem.

Noise leaking toward the upper part of the radiator 28 may affect the ground due to wind direction, atmospheric pressure, etc., but it becomes less of a problem because it decreases due to distance attenuation from the noise source to the sound receiving point.

The above is an explanation of the oil-feeding air-cooled transformer device.
In the case of self-cooling type, oil pump 33 and cooling fan 34
The air flow is the same as described above, except that the radiator 28 is stopped, but since there is no surrounding enclosure around the upper third part of the radiator 28, the cooling efficiency is better than when the entire circumference is enclosed.

In addition, in the case of the oil feed type, the air flow is the same as in the case of the self-cooling type, except that the oil feed pump 33 is operated and the cooling fan 34 is stopped.

In this embodiment, in FIG. 3, the radiator stand 32 and the sound insulating wall 35 are separate foundations, but the present invention is not limited to this, and depending on the noise level, the radiator stand 32 and the sound insulating wall 3
50 basics may also be used.

In addition, the present embodiment shown in FIG. 3 corresponds to the existing transformer device shown in FIG. 5 except for the sound insulating wall 35 and the sound insulating board and wind blocking board 41, so the present invention is applicable to the existing transformer device as shown in FIG. Noise can be reduced by modifying the equipment, such as by installing a sound insulating wall 35, a blocking plate, or a wind plate 41 as shown in FIG.

The present invention described above can also be applied to reduce the noise of an existing conventional transformer, and has the following effects in particular.

That is, (1) there is no need to replace with a new low-noise oil pump or low-noise fan.

(2) Since the existing oil pump and cooling fan can be used as they are, the control circuit and protection circuit can be used as is without changing them, and there is no need to increase the power for auxiliary equipment.

(3) Since the gap between the cooling device and the newly installed sound insulating wall can be reduced, noise reduction can be achieved with almost no modification to the transformer body and the cooling device.

(4) The sound insulating wall can be constructed by simply stacking concrete blocks, etc., and the sound insulating board/wind blocking board is made of iron plate or the like and can be easily attached to the sound insulating wall, and if necessary, sound absorbing material may be used.

There is an advantage that the noise reduction work can be completed at an economical low cost and in a short construction period.

Further, if the present invention is used, the following effects can be achieved when a transformer device is manufactured by applying the present invention from the beginning.

(1) A 50-phone class low-noise cooling device can be provided without using an expensive low-noise oil pump or low-noise fan.

(2) Since the space between the cooling device and the sound insulating wall can be made small, it is possible to provide a small and economical low-noise transformer device including the entire cooling device and the transformer body.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and front view of essential parts showing an example of a conventional soundproof cooling system for a transformer, respectively, and Figures 2a and b are
3A and 3B are schematic plan views showing an embodiment of the soundproof cooling device for a transformer according to the present invention, respectively. FIG. 4 a and b are explanatory views showing each side of the sound insulation wall applied to the present invention,
Figures a and b are a plan view showing an example of a conventional existing transformer device, and a sectional view taken along line A-A in figure a, in which 21 is a transformer tank, 25 and 26 are bushing pockets, and 2T 28 is an upper connecting pipe, 28 is a radiator, 29 is a lower connecting pipe, 33 is an oil pump, 34 is a cooling fan, 35 is a sound insulating wall, 36 is an opening, and 41 is a sound insulating plate and a wind blocking plate.

Claims (1)

[Scope of utility model registration request] The insulating oil heated on the transformer main body side flows into the radiator 28 through the upper connecting pipe 27, and the insulating oil cooled here is returned to the transformer main body side via the lower connecting pipe 29 and circulated. In a cooling device for an input transformer, a sound insulating wall 35 having an opening 36 on the transformer body side surrounds the entire circumference of the cooling device up to the height of the cooling fan 34 attached to the lower part of the radiator 28, and constitutes the cooling device. The heat sink 28
A sound insulating plate/wind shielding plate 41 that surrounds the radiator 28 up to a predetermined height position with a predetermined distance from the sound insulating wall 35
A soundproof cooling system for a transformer, characterized in that it is installed in a transformer.