JPH0351933Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a low-noise air-cooled cooling device mainly used for cooling oil in oil-filled electrical equipment such as transformers and reactors. A sound-absorbing box lined with sound-absorbing material is attached to each intake side of the cold heat exchanger group, and a wind cylinder consisting of a common air guide plate lined with sound-absorbing material is attached to each exhaust side. be.

[Prior art]

In recent years, transformers installed in suburban areas are required to keep noise levels low, and in many cases the transformer itself is installed inside a concrete building, for example, and the cooling device is installed outdoors. In such cases, the noise generated from the transformer body is sheared by the concrete walls of the building and is prevented from propagating to the outside, but air-cooled cooling equipment installed outdoors to perform the cooling function Noise from the blower propagates to the surrounding area from the intake and exhaust sides of the cooling device, making it difficult to achieve a desired noise level.

In order to solve this problem, a conventional low-noise air-cooled cooling device has been proposed as shown in FIGS. 1 and 2. In the figure, numeral 1 denotes an air-cooled heat exchanger, and usually a plurality of them are combined. 2 is a blower included in each heat exchanger 1; 3 is a sound deadening box attached to the intake side of each heat exchanger 1; 4 is a sound absorbing material attached to the inner surface of the sound deadening box 3; 5 is a sound absorbing material of each heat exchanger 1; A wind body consisting of a common air guide plate 51 attached to the exhaust side, 6 a sound absorbing material pasted on the inner surface of the air guide plate 51, 7 oil-filled electric equipment of a transformer, 8 oil-filled electric equipment 7 and each heat source. Pipes connecting the exchangers 1 and 9 are oil pumps.

Next, the operation will be explained. Air from the blower 2 is drawn into a sound deadening box 3, and the sound is absorbed by a sound absorbing material 4 on the inner surface of the sound deadening box 3. On the other hand, on the exhaust side, sound is absorbed by the sound absorbing material 6 of the wind cylinder 5. Since the conventional low-noise air-cooled cooling device is configured as described above, the sound-absorbing area of the sound-absorbing material 6 on the exhaust side is significantly smaller than that of the sound-absorbing material 4 on the intake side, and the sound-absorbing effect is low. There was a drawback that noise reduction had to be achieved by lowering the number of revolutions of the engine and reducing the amount of air blown. In addition, with conventional low-noise air-cooled cooling equipment, the cooling capacity P
The relationship between PαQ and air flow rate Q, PαQ ⁿ (where n is generally 1.3
~1.8), as the air flow Q decreases, the cooling capacity P decreases, so when using heat exchangers of the same shape, the cooling capacity P per unit decreases,
It had the disadvantage of requiring a large number of heat exchangers.

[Summary of the idea]

This idea was made in order to eliminate the drawbacks of the conventional ones as described above. The purpose of the present invention is to provide a low-noise air-cooled cooling device that can fully utilize the cooling capacity of the heat exchanger because the sound-absorbing area on the exhaust side of the heat exchanger group is increased by providing sound-absorbing material attached to the board. There is.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 3 and 4. In the figure, numerals 1 to 9 are the same as those in FIGS. 1 and 2, so their explanation will be omitted. Reference numeral 10 denotes a partition plate provided in the wind cylinder 5 in parallel with the installation direction of each heat exchanger 1 to divide the inside of the wind cylinder 5, and 11 is a sound absorbing material pasted on both sides of the partition plate 10.

By doing so, the exhaust gas from each heat exchanger 1 passes through the inside of the wind cylinder 5 along the partition plate 10, so that the sound absorption area on the exhaust side increases dramatically. At this time, a plurality of partition plates 10 (three in the drawing) are arranged on the outlet 52 side of the wind cylinder 5, and the partition plates 10 are made shorter as they are closer to the heat exchanger 1 in order to equalize the air volume inside the wind cylinder 5. Furthermore, the sound absorption effect can be further increased by increasing the number of partition plates 10 or decreasing the mounting pitch. Therefore, there is no need to lower the number of rotations of the blower 2 to reduce the amount of air blown in order to reduce noise, and the cooling capacity of each heat exchanger 1 can be fully demonstrated.

When the outlet 52 of the wind barrel 5 faces upward as in the above embodiment, a roof (not shown) to prevent rainwater from entering the outlet 52 can be provided to prevent deterioration of the sound absorbing materials 11 and 6 due to rainwater. can.

In the above embodiment, a single cooling device of the present invention is installed around the oil-filled electrical equipment 7, but it goes without saying that similar effects can be obtained even if several cooling devices are installed.

[Effect of idea]

As described above, according to this invention, by providing a partition plate installed in the wind cylinder parallel to the installation direction of the heat exchanger group to divide the inside of the wind cylinder, and a sound absorbing material affixed to this partition plate, the heat exchanger can be heated. Since the sound absorption area on the exhaust side of the exchanger group increases, the cooling capacity of the heat exchanger can be fully utilized. Therefore, when heat exchangers of the same shape are used, it is not necessary to install a large number of heat exchangers in consideration of the decrease in cooling capacity of each heat exchanger, as is the case in the past, so the device can be made smaller and lower in price.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional low-noise air-cooled cooling system, Figure 2 is its plan view (excluding piping),
FIG. 3 is a side view showing a low-noise air-cooled cooling device according to an embodiment of the invention, and FIG. 4 is a plan view thereof (excluding piping). In the figure, 1 is a heat exchanger, 2 is a blower, 3 is a sound deadening box, 4 is a sound absorbing material, 5 is a wind barrel, 51 is a wind guide plate,
52 is an outlet, 6 is a sound absorbing material, 7 is an oil-filled electric device such as a transformer, 8 is piping, 9 is an oil pump, 10 is a partition plate, and 11 is a sound absorbing material. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A sound-absorbing box lined with sound-absorbing material is attached to each intake side of a group of air-cooled heat exchangers equipped with a blower, and the same sound-absorbing material is lined inside each exhaust side. In a low-noise air-cooled cooling device equipped with a wind cylinder made of a common air guide plate, a partition plate is provided in the wind cylinder in parallel with the installation direction of the heat exchanger group and divides the inside of the wind cylinder. , and a sound-absorbing material affixed to the partition plate, and a low-noise type wind cooling characterized in that the partition plate is a plurality of partition plates aligned on the exit side of the wind cylinder, and the partition plates closer to the heat exchanger are shorter. type cooling device. (2) A low-noise air-cooled cooling device according to claim 1, which is a utility model registered claim, in which the wind barrel opens upward, and the opening is provided with a roof to prevent rainwater from entering.