JP2006196794A - Snow damage preventing device for cooling fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent snow from sticking to a fan guard or to run a cooling fan, for blowing it off, even if a curtain amount of snow has stuck to maintain cooling effect, by retrofitting a snow damage preventing device of simple structure to the cooling device. <P>SOLUTION: A heat dispersing radiator 1 of an outdoor unit is provided with a heatsink which is cooled by a cooling fan 3 that rotates in a wind duct 2. A fan guard 4 is so attached to a heat dispersing radiator 1 of the outdoor unit as to cover the cooling fan 3 on the blowing out side of the cooling fan 3. A domy cover 5 consists of a mesh material 6 having such mesh size as to allow a hot air to penetrate but not to allow snow to do, and is so attached to the fan guard 4 as to cover its entire surface. An open structure (access hole 7) is provided to the lower part of the domy cover 5 for blowing out the hot air from the heatsink. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooling fan attached to a radiator for heat dissipation of an outdoor device, and more particularly to a snow damage prevention device for a cooling fan in which snow enters a fan guard and the cooling fan cannot be rotated.

  Conventionally, when the capacity of an outdoor device such as a transformer or a shunt reactor becomes large, a radiator having a large number of heat radiating pipes and heat radiating panels arranged in parallel is attached around the transformer tank in order to increase the cooling effect. . A cooling fan is provided in the radiator to forcibly dissipate heat, and the cooled oil or insulating gas is pumped out into the transformer and forcedly circulated.

  As shown in FIG. 5, a cooling fan attached to a radiator for heat radiation of an outdoor device used in a cold region has a snow blown when the cooling fan 51 is stopped as shown in FIG. The snow melt water may freeze. In addition, water such as rain water may freeze at night. For example, when the snow S adhering to the fan guard 53 melts, the snow melt water S freezes again between the lower part of the fan guard 53 and the cooling fan 51, and the cooling fan 51 may not rotate. Therefore, a flange 54 is provided on the upper portion of the fan guard 53 so that snow does not hit the fan guard 53 so that the cooling fan 51 cannot be started.

  Techniques relating to such cooling devices for cold regions have been proposed. For example, as shown in Japanese Patent Application Laid-Open No. 10-50530 “Transformer Cooling Device for Cold Regions” of Patent Document 1, a cylindrical wind tunnel, an inner peripheral surface of the wind tunnel provided inside the wind tunnel, A cooling device for a transformer, wherein a cooling fan is formed by a cooling fan that is rotatably mounted with a small interval and a fan motor that rotationally drives the cooling fan, and the cooling fan is attached to a radiator that communicates with the transformer. Has proposed a technique in which the wind tunnel is inclined at an arbitrary angle downward from a horizontal position so that moisture in the wind tunnel flows out of the wind tunnel.

In Patent Document 1, a lead wire connected to a fan motor is wound around the outer periphery of the wind tunnel for each phase to form a winding, and the wind tunnel is heated by a starting current flowing in the winding. A technique for thawing freezing of a cooling fan and a wind tunnel has also been proposed.
JP2003-110981A

  However, when the collar 54 is attached to the upper part of the conventional fan guard 53, the warm air blown from the cooling fan 51 is partially bent downward to cause windage loss or a temperature difference from the outside air temperature. As a result, there is a problem that the cooling effect is likely to be reduced, such as making it difficult to generate an updraft (see the arrow line). In addition, a welding operation for attaching the flange 54 to the cooling device is required, and there is a problem that extra costs are required.

  In addition, as in Patent Document 1, the snow blown from the side cannot be surely protected only by tilting the wind tunnel downward. Further, the method of thawing frozen snow by heating a heater has a problem that it cannot be retrofitted to an existing cooling device. That is, it is difficult to assemble these devices of Patent Document 1 later to existing radiators of outdoor equipment because of their structures.

  The present invention has been developed to solve such problems. That is, an object of the present invention is to attach a snow damage prevention device having a simple structure to the cooling device later, thereby preventing the snow from adhering to the fan guard, or rotating and blowing the cooling fan even when a certain amount of snow is attached. It is possible to provide a snow damage prevention device for a cooling fan that can maintain a cooling effect.

According to the present invention, in a radiator (1) for heat radiation of an outdoor device provided with a radiator that is cooled by a cooling fan (3) that rotates in a wind tunnel (2), on the outlet side of the cooling fan (3). The fan guard (4) attached to the radiator (1) for heat radiation of the outdoor equipment so as to cover the cooling fan (3), and the hot air attached to the fan guard (4) so as to cover the entire surface thereof And a dome-shaped cover (5) made of a mesh material (6) having a joint that allows the snow to pass but does not allow snow to pass therethrough.
It is preferable that an open structure for confirming the movement of the cooling fan (3) with bare hands is provided below the dome-shaped cover (5). For example, the open structure is a structure in which an inspection port (7) opened in a substantially arc shape in the lower part of the dome-shaped cover (5) or a substantially lower half of the dome-shaped cover (5) is cut out.

  In the dome-shaped cover (5), the dome-shaped cover (5) may be arranged so that a plurality of wires constituting the mesh material (6) are inclined so that melted water droplets can be easily dropped. preferable. The dome-shaped cover (5) can be fastened and fixed at the same time with a bolt fixing the fan guard (4).

In the invention having the above configuration, the snow melt water of the snow (S) adhering to the mesh material (6) constituting the dome-shaped cover (5) is warm air because the joint distance between the mesh materials (6) is about 5 mm. Passes through but does not allow snow (S) to pass through it, it can be dropped along the surface of the joints of the net (6). In addition, even if the water | moisture content which remained on the joint of the net | network material (6) freezes, it melts and blows away with the warm air at the time of rotation of the cooling fan (3). In addition, in the net material (6) of about 5 mm joint, it does not have a bad influence on the temperature rise of the radiator (1) for heat radiation of outdoor equipment in summer. The stainless steel mesh material (6) is inexpensive and easy to install, so it costs little.
In addition, since the direction of the warm air discharged from the cooling fan (3) does not change, even if the dome-shaped cover (5) is installed, the cooling effect is not lowered.

  If the dome-shaped cover (5) is provided with an open structure such as an inspection port (7) for blowing out warm air from the radiator, the life of the bearing is removed without removing the dome-shaped cover (5). Checks on the cooling fan (3) such as checks can be easily performed.

  The snow damage prevention device for a cooling fan of the present invention attaches a dome-shaped cover made of a net material so as to cover the entire surface of the fan guard that protects the cooling fan, so that snow adheres to the fan guard of the cooling fan. In addition to blocking, the cooling fan can be rotated even when snow is attached to the net.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view (a) and a front view (b) showing a snow damage prevention apparatus for a cooling fan according to a first embodiment of the present invention.
The snow damage prevention device for a cooling fan according to the first embodiment includes a cooling fan 3 that rotates inside a wind tunnel 2 that constitutes a radiator (not shown) provided in a radiator 1 for heat radiation of an outdoor device such as a transformer, A fan guard 4 provided on the outlet side of the cooling fan 3 so as to cover the cooling fan 3, and a dome-shaped cover 5 made of a net 6 attached to the fan guard 4 so as to cover the entire surface thereof. It is provided.

  The fan guard 4 is a combination of concentric large and small circular wires attached to the opening of the wind tunnel 2. The fan guard 4 protects the cooling fan 3 from foreign matters flying by wind and rain, and also prevents human animals from coming into contact with rotating objects and being injured.

  The dome-shaped cover 5 is formed by forming a net 6 in a shallow, substantially hemispherical shape, and is attached to the radiator 1 for heat radiation of an outdoor device so as to cover the entire surface of the fan guard 4. For example, the dome-shaped cover 5 can be bent and fixed at the same time with bolts (not shown) fixing the fan guard 4 at the same time. Alternatively, it is possible to fix the dome-shaped cover 5 with a band without removing the fan guard 4. The fixing means of the dome-shaped cover 5 is not limited to these, and can be retrofitted to the radiator 1 for heat dissipation of existing outdoor equipment.

In particular, the dome-shaped cover 5 of the present invention is composed of a mesh material 6 having joints that allow wind to pass but not snow. This is so that even if snow adheres to the dome-shaped cover 5, it passes through this joint and reaches the fan guard 4 and adheres to the cooling fan 3. As a mesh material 6 that meets such conditions, it was verified that the joint spacings L1 and L2 were optimally about 5 mm (see FIG. 3). Further, as the material of the net member 6, a metal material, for example, a stainless steel material was good.
Even in this state, the snow damage prevention apparatus for a cooling fan according to the present invention can prevent snow from adhering to the fan guard 4 that protects the cooling fan 3, and the cooling fan 3 can also be used in a state where snow adheres to the net member 6. Can be rotated

  Furthermore, an open structure for confirming the movement of the cooling fan (3) with bare hands is provided at the bottom of the dome-shaped cover 5. For example, an inspection port 7 opened in a substantially arc shape is provided below the dome-shaped cover 5. The open structure of the inspection port 7 and the like can be inspected internally from this portion when the life of the bearing of the cooling fan 3 is inspected. That is, the bearing inspection can be easily performed without removing the dome-shaped cover 5.

2A and 2B are explanatory views showing a state in which snow is melted by warm air when snow adheres to the entire surface of the dome-shaped cover. FIG. 2A shows a state in which the hot air is blown out only from the inspection port, and FIG. A state in which the wind is blown out from a part of the dome-shaped cover together with the inspection port, and (c) is a state in which the warm air is blown out from the entire dome-shaped cover.
In the winter season in the heavy snow region, the snow that has blown off adheres to the dome-shaped cover 5 of the snow damage prevention device for the cooling fan (see FIG. 2A). When the cooling fan 3 is rotated in this state and hot air is blown out, the hot air is blown out from the inspection port 7, so there is no problem that the hot air is filled in the wind tunnel 2.
When this hot air is blown out, the inner surface of the dome-shaped cover 5 is warmed by the hot air, and the attached snow S begins to melt. Therefore, the warm air blows out from a part of the dome-shaped cover 5 together with the inspection port 7 (see FIG. 2B). Snow melted water adhering to the net 6 of the dome-shaped cover 5 falls along the surface of the joint. Even if the water remaining on the joints of the net 6 is frozen, it is melted and blown away by the hot air when the cooling fan 3 is rotated.
Further, as time elapses, all the snow attached to the dome-shaped cover 5 is melted and the warm air blows out from the entire dome-shaped cover 5 (see FIG. 2C). Since the direction of the hot air discharged from the cooling fan 3 does not change, the cooling effect is not lowered even if the dome-shaped cover 5 is attached.

FIG. 3 is a front view showing an enlarged view of the net member of the dome-shaped cover.
As shown in the figure, the mesh member 6 of the dome-shaped cover 5 of the present invention is arranged so that a plurality of wires constituting the mesh member 6 are inclined. This is because the rhombus formed of the wire constituting the net member 6 has apexes arranged at the top and bottom, so that melted water droplets can be easily dropped. In the example shown in the figure, it is a substantially rhombic shape in the vertical direction, but the same effect can be obtained even if this is a substantially square or rectangular shape. Alternatively, an oval shape or an oval shape is also possible.

FIG. 4 is a front view showing a snow damage prevention device for a cooling fan according to a second embodiment of the present invention.
As long as the lower part of the dome-shaped cover 5 is provided with an open structure for blowing out hot air from the radiator, the inspection port 7 is not limited to the above-described substantially circular arc shape. For example, a structure in which the substantially lower half of the dome-shaped cover 5 is opened is also possible. Even in a snowfall region, in a region where there is little heavy snowfall or snowstorm, the dome-shaped cover 5 functions even when the fan guard 4 is covered from above. By forming such a wide open structure, it is possible to eliminate problems such as the movement of the cooling fan 3 not being able to be confirmed with bare hands.

  In the present invention, the cooling fan snow damage prevention apparatus is provided with a dome-shaped cover 5 made of a mesh material 6 having joints that allow wind to pass but not snow to cover the fan guard 4. Of course, as long as it is possible to prevent the snow from adhering to the fan guard 4 of the cooling fan 3, the invention is not limited to the embodiment of the invention described above, and various modifications can be made without departing from the scope of the invention.

  Since the snow damage prevention device for cooling fan of the present invention can protect the cooling fan from snow damage, in addition to the radiator for heat radiation of the outdoor equipment described above, any equipment provided with a cooling fan used in the snowfall area can be used for various equipment. Can be used.

It is a sectional side view (a) which shows the snow damage prevention apparatus for cooling fans of Example 1 of this invention, and front view (b). It is explanatory drawing which shows the state which melts snow with warm air when snow adheres to the dome-shaped cover whole surface, (a) is a state in which warm air is blowing out only from an inspection port, (b) is warm air inspected A state in which a part of the dome-shaped cover is blown out together with the mouth, and (c) is a state in which warm air is blown out from the entire dome-shaped cover. It is a front view which shows the enlarged view of the net | network material of a dome-shaped cover. It is a front view which shows the snow damage prevention apparatus for cooling fans of Example 2 of this invention. It is a sectional side view which shows the state which attached the collar to the conventional fan cover.

Explanation of symbols

1 Radiator for heat radiation of outdoor equipment 2 Wind tunnel 3 Cooling fan 4 Fan guard 5 Dome-shaped cover 6 Net material 7 Inspection port S Snow

Claims (6)

In a radiator (1) for heat radiation of an outdoor device provided with a radiator that cools by a cooling fan (3) that rotates in a wind tunnel (2),
A fan guard (4) attached to the radiator (1) for heat radiation of the outdoor equipment so as to cover the cooling fan (3) on the outlet side of the cooling fan (3);
The fan guard (4) was provided with a dome-shaped cover (5) made of a mesh material (6) having a joint to cover the entire surface of the fan guard (4) and passing warm air but not snow. A snow damage prevention device for a cooling fan. The snow damage prevention device for a cooling fan according to claim 1, wherein an open structure for confirming the movement of the cooling fan (3) with a bare hand is provided below the dome-shaped cover (5). The snow damage prevention device for a cooling fan according to claim 2, wherein the open structure is an inspection port (7) opened in a substantially arc shape at a lower portion of the dome-shaped cover (5). The snow damage prevention device for a cooling fan according to claim 2, wherein the open structure is a structure in which a substantially lower half of the dome-shaped cover (5) is cut out. In the dome-shaped cover (5), the dome-shaped cover (5) is disposed so that the wire constituting the mesh material (6) is inclined so that melted water droplets can be easily dropped. The snow damage prevention device for a cooling fan according to claim 1, 2, 3, or 4. The cooling fan according to claim 1, 2, 3, 4 or 5, wherein the dome-shaped cover (5) is fastened and fixed simultaneously with a bolt fixing the fan guard (4). Snow damage prevention device.
Place.