JP7135520B2 - Cooling system - Google Patents

Description

The present invention relates to a cooling device for cooling a work.

A conveyor furnace is sometimes used to heat and cool the work. The conveyor furnace is provided with a heating zone and a cooling zone, and heats and cools the work carried by the conveyor. In the heating zone, the temperature is set to the target value temperature or higher, and the workpiece is heated by gas heat transfer and radiation. In the cooling zone, the work is cooled by blowing air or introducing cooling gas. Also, although the work is assumed to be cylindrical, for example, its diameter varies. In the conveyor furnace, heating and cooling are possible in the heating zone and the cooling zone as long as the diameter is placed on the conveyor.

In general, conveyor furnaces have slow heating and cooling speeds for workpieces, resulting in long transport paths and large facilities. It is difficult to integrate the heating zone and the cooling zone, it cannot be miniaturized, and the equipment cost is high.

Among these methods, induction heating can be used for heating, so that the size of the device can be reduced and the efficiency can be improved. Patent Literature 1 discloses an apparatus for induction heating a cylindrical workpiece.

JP 2016-66576 A

On the other hand, for cooling, it is necessary to blow air or introduce a cooling gas to the entire cooling zone of the conveyor furnace, resulting in high running costs and a slow cooling rate.

Further, the apparatus described in Patent Document 1 can be applied to heating works of various diameters, but cannot be cooled.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact cooling device with high cooling efficiency.

Another object of the present invention is to provide a compact cooling device capable of cooling workpieces having various diameters.

In order to solve the above-described problems and achieve the object, a cooling device according to the present invention is a cooling device for cooling a workpiece, comprising: a group of cooling fins; The cooling fin group comprises a plurality of cooling fins spaced apart from each other to form layers, and the cooling fins partially contact the outer surface of the workpiece and penetrate in the layer direction. It is characterized by having coolant holes.

The coolant holes may be formed at mutually shifted positions in the cooling fins adjacent in the layer direction.

The work is a columnar object, and the cooling fin group is provided in a plurality and arranged radially with respect to the work, covers the entire circumference of the column surface of the work, and is configured to be movable forward and backward with respect to the outer surface of the work. may be in contact with and spaced apart from said outer surface.

The cooling fins in one cooling fin group and the cooling fins in the other adjacent cooling fin group are stacked with a shift in the layer direction, and can contact the outer surface without interference. good too.

The inner diameter side portion of the cooling fin may have a symmetrical shape bent at an obtuse angle.

An inner diameter side portion of the cooling fin may be shaped to match the outer surface.

An inner diameter side portion of the cooling fin may be provided with a heat-resistant flexible material.

Further, a cooling device according to the present invention is a cooling device for cooling a columnar work, which is arranged radially with respect to the work, covers the entire circumference of the work, and has a A plurality of cooling fin groups configured to be movable back and forth, contacting and separating from the column surface, and coolant delivery means for delivering coolant toward the cooling fin groups, wherein the cooling fin groups are connected to each other. It comprises a plurality of cooling fins spaced apart to form layers, and the cooling fins are plate-shaped perpendicular to the axis of the columnar body, and the inner surface is in contact with the columnar surface.

In the cooling device according to the present invention, the cooling fins are provided with a plurality of coolant holes that penetrate through the cooling fins, the inner surfaces of which are in contact with the column surfaces. Also, the coolant ejected from the coolant holes in one cooling fin collides with the surface of another cooling fin adjacent in the layer direction, and forms a collision jet. Therefore, the heat transfer boundary film tank becomes very thin, the thermal conductivity and the cooling efficiency are improved, and the size of the device can be reduced.

Furthermore, in the cooling device according to the present invention, the cooling fin group is configured to be able to move forward and backward with respect to the column surface, and is in contact with and separated from the column surface. Since the cooling fins contact the column surface of the workpiece to transfer and release heat instead of cooling the atmosphere, downsizing is possible.

FIG. 1 is a perspective view of a cooling device with a group of cooling fins separated from a work. FIG. 2 is a cross-sectional side view of the cooling fin group. FIG. 3 is a perspective view of cooling fins. 4A and 4B are diagrams showing a cooling device applied to a small-diameter work, in which (a) is a perspective view thereof and (b) is a side view thereof. FIG. 5 is a diagram showing a cooling device applied to a large-diameter work, (a) is its perspective view, and (b) is its side view.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a cooling device according to the present invention will be described in detail below with reference to the drawings. In addition, this invention is not limited by this embodiment.

FIG. 1 is a schematic perspective view showing a cooling device 10 which is an embodiment of the cooling device according to the present invention. A cooling device 10 is a device for cooling a work (columnar object) 12 . The workpiece 12 is a cylindrical metal body, and is, for example, a rotor core of a motor in which a plurality of disk-shaped thin steel plates are laminated. When the shaft is fixed to the hole formed in the center of the rotor core by shrink fitting, the hole formed in the center of the rotor core is expanded by heating the rotor core. Cool and fix the rotor core and shaft. At this time, the rotor core is heated to about 130° C. and then cooled.

The cooling device 10 has eight cooling fin groups 14 and a fan (coolant delivery means) 16 for delivering coolant toward the cooling fin groups 14 . The fan 16 is provided, for example, coaxially with the work 12 , and the coolant is sent toward the cooling fin group 14 and the end face of the work 12 . The coolant is air, cooling gas or cooling liquid. The coolant delivery means may be, for example, one or more nozzles. The cooling fin group 14 is arranged radially with respect to the workpiece 12 so as to cover the entire periphery of the column surface 12a of the workpiece 12 . In order to cover the entire circumference of the columnar surface 12a of the workpiece 12, the number of the cooling fin groups 14 should be four or more.

On the other hand, if the number of the cooling fins 14 is small, the mechanism becomes simple, and if the number is large, a large contact area with the workpiece 12 is ensured by the inner diameter side portion 19a (see FIG. 3), which will be described later. It should be set in the range of 4 to 12. The cooling fin group 14 advances and retreats radially with respect to the cylindrical surface 12a of the work 12 by an advancing and retreating mechanism (not shown) while synchronizing with it. Such an advancing/retreating mechanism can be applied even when the diameter of the work 12 is different.

The cooling fin group 14 is composed of a plurality of cooling fins 18 which are separated from each other with a gap equal to or larger than the plate thickness of the cooling fins 18 to form a layer. The cooling fins 18 are stacked in the axial direction of the workpiece 12 . The number of cooling fins 18 in one cooling fin group 14 is, for example, 5 to 8, but the number may be increased or decreased according to conditions such as the axial length of the workpiece 12 and the plate thickness of the cooling fins 18 . If the number of cooling fins 18 is large, the surface area is increased and the cooling effect is enhanced.

The cooling fin 18 has a plate shape perpendicular to the axis of the workpiece 12 and has a large number of coolant holes 20 penetrating in the layer direction (plate thickness direction). Coolant holes 20 are provided at appropriate intervals over substantially the entire area of cooling fins 18 . The cooling fins 18 are fan-shaped with two straight portions and an inner diameter side portion 19a and an outer diameter side portion 19b between the straight portions, and are narrow in the direction near the cylindrical surface 12a and wide in the far direction. Although the inner diameter side portion 19a is composed of two straight portions, it may be composed of three or more straight portions, or may have an arc shape. Further, although the outer diameter side portion 19b has an arc shape, it may be composed of two or more straight portions. The cooling fin group 14 and the cooling fins 18 are radially movable, and a part of the inner diameter side portion 19a contacts and separates from the column surface 12a.

The cooling fins 18 in one cooling fin group 14 and the cooling fins 18 in the other cooling fin group 14 adjacent in the circumferential direction are laminated with a shift in the layer direction. The cooling fin group 4 can contact the column surface 12a without mutual interference. As a result, there is no gap in the circumferential direction between the adjacent cooling fin groups 14, and the coolant contacts the cooling fin groups 14 with little leakage. In addition, by securing a long forward/backward stroke of the cooling fin group 14, it can be applied to works 12 having greatly different diameters. When the cooling fins 18 in one cooling fin group 14 and the cooling fins 18 in another cooling fin group 14 adjacent in the circumferential direction are in contact with each other in the layer direction, the structure is stabilized and the heat transfer coefficient is increased. Leakage of the coolant is reduced and it becomes easier for the coolant to pass through the coolant holes 20 .

As shown in FIG. 2, the coolant hole 20 in the cooling fin 18a of one layer among the cooling fins 18 is formed at a position shifted from the coolant hole 20 in the other cooling fin 18b adjacent in the layer direction. The cooling fins 18a and the cooling fins 18b are arranged alternately. As a result, as partially indicated by arrows, the coolant ejected from the coolant holes 20 of the cooling fin 18a hits a portion without the coolant holes 20 when it hits the cooling fin 18b positioned next downstream, forming a collision jet. Also, when the cooling fin 18b escapes from the cooling fin 18b and hits the next cooling fin 18a located on the downstream side, it also hits a location without the cooling fin 20 and similarly becomes a collision jet. In this way, on each surface of the stacked cooling fins 18, the heat transfer boundary film tank becomes very thin due to the impinging jet flow, so that the thermal conductivity and cooling efficiency are improved, and the cooling device 10 can be made smaller. Although it is desirable that the coolant holes 20 in the cooling fin 18a and the coolant holes 20 in the adjacent cooling fin 18b are completely displaced, depending on the conditions, a corresponding effect can be obtained even if they partially overlap. In addition, the coolant jetted from the coolant holes 20 only needs to be configured so as to collide with the surfaces of other cooling fins 18 adjacent in the layer direction. It may be.

As shown in FIG. 3, the cooling fins 18 are fan-shaped plate materials, and can be made of, for example, copper, aluminum, or an aluminum alloy with good thermal conductivity. The central angle of the sector formed by the cooling fins 18 is, for example, 50°. can be sufficiently covered. That is, it is preferable that "the central angle of the sector×the number of cooling fins 18 in the circumferential direction≧360°". An inner diameter side portion 19a of the cooling fin 18 is a contact surface with respect to the columnar surface 12a of the workpiece 12, and has a symmetrical shape bent at an obtuse angle. A heat-resistant flexible material 22 is provided on the inner diameter side portion 19a. The heat-resistant flexible material 22 is, for example, a silicone material, which does not change in quality even with respect to the high-temperature workpiece 12, and furthermore, the contact area between the column surface 12a and the cooling fins 18 is increased to improve the thermal conductivity. In addition, since the inner diameter side portion 19a has a shape bent at an obtuse angle, it can be applied to works 12 having various diameters.

If the diameter of the workpiece 12 is constant depending on the application, the inner diameter side portion 19a may be formed into an arcuate surface that matches the cylindrical surface 12a of the workpiece 12. FIG. This further increases the contact area and improves the thermal conductivity. Furthermore, the workpiece 12 is not limited to a cylindrical body, and may be, for example, a prism. In this case, the inner diameter side portion 19a should be flat without bending.

When the cooling device 10 is applied to a workpiece 12 having a small diameter, as shown in FIGS. 19a abuts on the columnar surface 12a of the workpiece 12. As shown in FIG. Further, when the cooling device 10 is applied to a workpiece 12 having a large diameter, as shown in FIGS. The portion 19a abuts on the columnar surface 12a of the workpiece 12. As shown in FIG. In this way, the cooling device 10 can be applied to workpieces 12 of various diameters, and has high versatility. 4(b) and 5(b), only three cooling fin groups 14 arranged continuously in the circumferential direction are shown so as not to be complicated.

4 and 5, the cylindrical surface 12a of the workpiece 12 is in contact with each cooling fin 18 over a moderately wide area due to the obtuse-angled bent shape of the inner diameter side portion 19a and the heat-resistant flexible material 22. Heat transfer and heat dissipation. The heat of the inner diameter side portion 19a diffuses toward the outer diameter side portion 19b. Since the cooling fins 18 are appropriately wide and the number of the cooling fins 18 is large, they act as a so-called heat sink to cool the workpiece 12 .

Furthermore, in the cooling device 10, the coolant is sent out by the fan 16, and hits the surfaces of the adjacent cooling fins 18 in the layer direction as impinging jets while passing through the coolant holes 20 of the cooling fins 18, thereby enhancing the cooling efficiency. The coolant not only hits the cooling fin group 14 but also the end face and the inner peripheral surface of the workpiece 12 to promote cooling. In addition, since the cooling device 10 does not cool the atmosphere of the place where the work 12 is arranged, but heat is transferred to the cooling fins 18 to cool the cooling fins 18 by forced air cooling or forced liquid cooling. It does not require a space like a zone, is compact, and has high cooling efficiency. Due to the high cooling efficiency, the workpiece 12 can be rapidly cooled, and the running cost can be reduced.

It goes without saying that the present invention is not limited to the above-described embodiments, and can be freely modified without departing from the gist of the present invention.

10 Cooling device 12 Work 12a Column surface 14 Cooling fin group 16 Fans 18, 18a, 18b Cooling fin 19a Inner diameter side 20 Coolant hole 22 Heat-resistant flexible material

Claims (7)

A cooling device for cooling a columnar workpiece,
A plurality of cooling fins arranged radially with respect to the work, covering the entire circumference of the cylindrical surface of the work, configured to be movable forward and backward with respect to the outer surface of the work, and in contact with and separated from the outer surface flock and
coolant delivery means for delivering coolant toward the cooling fin group;
has
The cooling fin group consists of a plurality of cooling fins spaced apart from each other to form layers,
A cooling device, wherein the cooling fins are partially in contact with the outer surface and have a plurality of coolant holes penetrating in a layer direction. The cooling device according to claim 1, wherein
The cooling device according to claim 1, wherein the cooling fins adjacent to each other in the layer direction have the cooling holes at positions shifted from each other. The cooling device according to claim 1 , wherein
The cooling fins in one cooling fin group and the cooling fins in the other adjacent cooling fin group are stacked with a shift in the layer direction, and can contact the outer surface without interference. A cooling device characterized by: In the cooling device according to any one of claims 1 to 3 ,
The cooling device according to claim 1, wherein the inner diameter side portion of the cooling fin has a symmetrical shape bent at an obtuse angle. In the cooling device according to any one of claims 1 to 3 ,
The cooling device according to claim 1, wherein the inner diameter side portion of the cooling fin has a shape matching the outer surface. In the cooling device according to any one of claims 1 to 5 ,
A cooling device, wherein a heat-resistant flexible material is provided on an inner diameter side portion of the cooling fin. A cooling device for cooling a columnar workpiece,
a plurality of cooling fin groups arranged radially with respect to the work, covering the entire circumference of the work, configured to be movable forward and backward with respect to the column surface of the work, and being in contact with and separated from the column surface;
coolant delivery means for delivering coolant toward the cooling fin group;
has
The cooling fin group consists of a plurality of cooling fins spaced apart from each other to form layers,
A cooling device, wherein the cooling fins have a plate shape perpendicular to the axis of the columnar object, and the inner surfaces thereof are in contact with the columnar surfaces.

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