JP2564731Y2 - Forced air cooling system for phase separation bus - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a forced forced air cooling device for phase separation bus for air cooling the that current conductors connecting between the generator and the main transformer in power plants is there.

[0002]

2. Description of the Related Art FIG .
3-273808 No.) Conventional this kind that have been proposed by
Ru overall configuration diagram illustrating a forced through air-cooling retirement unit. In the figure, 1 is not shown, but connects the generator and the main transformer and
As shown, the current conductors 2 accommodated in the ducts are a regular electric blower 3, a spare electric blower 4, a suction side duct 5 of the electric blower, an air path switching damper 6, a connection duct 7, and a heat exchanger 8.
Forced air cooling device that cool wind is configured and the current conductor 1 or the like, 9 makeup filter provided on the suction side duct 5, 10 almost wholly except for a small portion of the gap the outer surfaces of the make-up filter 9 cover configured to covering Migihitsuji, respectively to the suction side and the discharge side of the electric dynamic blowers 3,4 provided with bellows-shaped flexible joint 11, 12, 13 and 14 each full lexical Bull joints 11, 12
This is a divided cover configured to completely surround the entire outer periphery of the device, and has divided portions 13a and 14a.

Next, the operation will be described. The current conductor 1, which generates heat by energization, is cooled by cooling air circulating along the dotted arrow in FIG. 5, while the cooling air that has returned due to a rise in temperature due to heat removal is used for the ordinary electric blower 3 or for the standby. After the discharge pressure (blowing pressure) is given by the electric blower 4,
The cooling water is cooled by the heat exchanger 8 using the cooling water as the refrigerant, and circulates again to the current conductor 1. The makeup filter 9
Has the function of sucking and replenishing the shortage of the cooling air volume due to leakage in the middle of the cooling air circulation path from outside air when recirculating the cooling air, and the flexible joints 11 and 12 prevent the propagation of micro-vibration by the operation of the electric blower and the power plant. It functions to absorb the installation error of each device in the etc.

On the other hand, during the operation of the electric blower 3 or 4, noise is generated due to the generation of a vortex of air or the like due to the high speed rotation of the impeller 3a or 4a inside the electric blower 3 or 4. However, this noise is generated in the makeup filter 9 and the flexible joints 11 and 12 due to the structure and the characteristic that the material is nonmetal such as a thin rubberized cloth.
In particular, the cover 10 and the split covers 13 and 14 are attached to suppress the permeation noise which leaks out of the makeup filter 9 and the like to the outside. The noise value around the joints 11 and 12 is suppressed to a level equivalent to the noise value transmitted through ducts such as the suction side duct 5 and the air path switching damper 6.

However, even in such a situation, when the electric blowers 3 or 4 are operated, the power level of the noise generated inside them can be expected to be considerably large, and the ducts can be expected to have a relatively sound insulating effect. Although it is made of ordinary steel sheet, it has a considerable surface area,
Further, a high-speed rotation of the impeller 3a or 4a having a plurality of blades generates a pulsating wind pressure at a frequency of about several tens to several hundreds of hertz in the cooling air, so that vibrations are excited on the wall surfaces of the ducts, and The radiation of noise due to the vibration may overlap, and it is inevitable to be aware of the noise around the forced air cooling device 2 (for example, in a device for a phase separation bus installed inside a power plant, 80 In general, noise of about 90 decibels (A) was observed.

[0006]

Since conventional forced through an air-cooling retirement instrumentation <br/> location [devised is to solve the above is constructed as described above, in recent years the power plant
Due to the demand for quietness in new plants, it has become extremely difficult to meet the stringent noise regulations that are being applied to each equipment, while the noise for inspection and repair personnel in the power plant has been reduced. The feeling of discomfort reduction was also increasing. Therefore, to reduce noise,
For example low-noise specifications expensive with introducing electric blower or cover entire apparatus made of sound insulating coat metal or electric blower large capacity and size to which the power electronics technology, that has a blade of special shape Although there is a study to reduce the noise by operating the motor at less than the rated number of times by using the method, all of them have drawbacks in terms of economy and installation space.

[0007] This invention has been made to solve the above problems, additional installation space without the entire Ku necessary and economical further phase separation noise can be achieved by simple means The purpose is to obtain a forced air cooling device for the bus .

[0008]

SUMMARY OF THE INVENTION A phase separation mother according to the present invention.
Forced air cooling apparatus of the line, the outside surface of the make-up filter
A cover attached to the covering Migihitsuji, the segmented cover provided so as to surround the outer periphery entire flexible joint,
The whole or a part of the air passage switching damper and the duct is constituted by using a damping steel plate.

[0009]

[Action] in have you to this invention, the noise generated these internally during operation of the electric blower, transmitted makeup filter outer cover, the outer segmented cover flexible joint or from the ducting, to the outside When
The damping steel plates made of these materials exhibit high sound insulation performance, and the noise generated due to the wall vibration of the ducts due to the pulsating pressure of the cooling wind is suppressed by the damping action of the wall surfaces of the ducts.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the drawings, the same or corresponding parts as those of the conventional one are denoted by the same reference numerals, and description thereof is omitted. In Figure 1, the suction side duct have configured <br/> using vibration damping steel plate of a few mm thickness 15, 16, 17 air passage switching damper, and the connection duct 18 is only one makeup filter 9 substantially wholly covering cover made vibration damping steel plate attached to Migihitsuji except the gap parts, 19 and 20 each full lexical Bull joint 1
A split cover made of a vibration damping steel plate configured to surround the entire outer periphery of each of the first and second outer circumferential portions, and the split portions 19a, 20
a.

FIG. 2 is a sectional view taken along line II-II of FIG.
The cross section is shown at the position of. In FIG.
Reference numerals 21 and 22 denote wall surfaces constituting the suction-side duct 15, which are made of special resin layers 21a and 22 indicated by oblique lines as shown in the figure.
This is a damping steel plate formed by sandwiching a between two thin metal plates 21b and 22b in a sandwich shape. 23 is a wall surface 21,
22 is a welding bead for connecting the metal plates 22 to each other or preventing peeling of thin metal plates facing each other on the cut surface of the damping steel plate.

FIG. 3 is a sectional view showing the vicinity of the makeup filter 9 and the cover 18 of FIG. In FIG. 3, reference numerals 24 and 25 denote wall surfaces of the cover 18, which are made of a damping steel plate, similarly to the suction side duct 15, and formed by welding into the shape of the cover 18 as shown. Note that a gap 26 of about several mm to 1 cm is formed between the cover 18 and the suction-side duct 15 around the entire circumference of the cover 18. The air is supplied from.

FIG. 4 is an enlarged cross-sectional view of a portion IV of FIG. 1 to show a detailed structure such as the split cover 20 of FIG. In FIG. 4, reference numerals 3b and 16b denote flanges of the service electric blower 3 and the air path switching damper 16, respectively, 27 denotes a split-type support flange attached to the flange 3b, and 28
Is a bolt for attaching the split cover 20 to the support flange 27, and 29 is a gasket inserted into a gap between the flange 16b and the split cover 20. The split cover 20 and the air passage switching damper 16 are formed using a damping steel plate as shown. The structure of the divided cover 20 and the parts related thereto are also substantially the same as those shown in FIG.

During operation of the electric blower 3 or 4, noise generated inside the blower passes through ducts such as the suction side duct 15 and the air path switching damper 16, as well as through the cover 18 and the split covers 19 and 20. Since these materials are vibration-damping steel sheets, the transmission loss is greater than that of conventional steel sheets of the same thickness, and the tendency is particularly noticeable in the high frequency range (about 2 KHz or more). At the same time, and the degree of annoyance to the human ear is considerably reduced. Further, in ducts such as the suction side duct 15 and the air path switching damper 16, the pulsating wind pressure component of the cooling wind excites vibration on these wall surfaces as in the conventional example, but a part of the energy at the time of the vibration is generated. For example, in FIG. 2, the thin resin layers 21a and 22a made of a viscoelastic substance are converted into heat energy by internal friction and interfacial friction, and the vibration is suppressed as compared with the conventional wall, so that the acoustic power of the wall is reduced. Also, the noise level due to the wall vibration of the ducts is reduced. In other words, in other words, the noise is significantly reduced by the two effects of the sound insulation of the noise generated from inside the electric blower and the suppression of the noise caused by the wall vibration of the ducts due to the damping action as compared with the conventional one.

In the above embodiment, the suction side duct 15,
Ducts such as an air path switching damper 16 and a connection duct 17;
In addition, the cover 18 and the split-type covers 19 and 20 are all configured by applying the damping steel plate. However, in consideration of the degree of contributing to noise reduction and economy, the damping steel plate is effectively used. In the sense of utilizing, for the ducts and covers,
It may be configured by partially applying.

In the above-described embodiment, the cooling air path in the forced air cooling device 2 is configured such that after the return cooling air is pressurized and discharged by the electric blower, the cooling air is sent to the heat exchanger 8. The same effect can be obtained even in a configuration in which the return cooling air is first passed through the heat exchanger 8, then guided to the electric blower, and discharged directly toward the current conductor.

[0017]

As described above, according to the present invention, the use of the damping steel plate for all or a part of the cover, the divided type cover and the ducts makes it possible to reduce the cost compared with the conventional one by these means which are economical and simple. both the more low noise and forced air cooling device can be obtained, magnetic flux leakage by energizing current flight to the device
Even if it enters, the damping steel sheet can achieve the same noise reduction
Since the amount of steel sheets is smaller than that of steel sheets, leakage flux is collected.
The effect of suppressing heat generated by electromagnetic phenomena, which is hard to round
Is obtained .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a forced air cooling device for a phase separation bus according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view of a cover part of FIG. 1;

FIG. 4 is a sectional view of a part IV in FIG. 1;

FIG. 5 is an overall configuration diagram showing a conventional device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 current conductor 2 forced air cooling device 3 regular electric blower 4 spare electric blower 8 heat exchanger 9 makeup filter 11, 12 flexible joint 15 suction side duct 16 air path switching damper 17 connection duct 18 cover 19, 20 split type cover

Claims (1)

(57) [Scope of request for utility model registration] The current conductor connecting the generator and the transformer is cooled.
A forced air cooling device for a phase-separated bus to be replaced , including a regular electric blower , a spare electric blower , an air path switching damper , a heat exchanger ,
In the cold却風duct or we composed for ventilation, provided in a part of the duct for sucking supplied from outside air Upon cooling air recirculating the shortage of the cooling air amount due to the leakage of the middle cooling air circulation path a cover attached to the covering Migihitsuji outer surface of the make-up filter is, connection of the duct for installation error absorption of the electric blower minute vibration propagation prevention and each device by <br/> OPERATION of a segmented cover have configured to surround wholly the outer periphery entire flexible joint provided in part, characterized by being constructed using all or vibration damping steel plate that portion of said air passage switching damper and duct Forced air cooling device for phase separation bus .