JP2020020502A - Cooling device - Google Patents

Abstract

To provide a cooling device which cools workpieces quickly and easily at low costs while preventing occurrence of defects of the workpieces.SOLUTION: A cooling device 1 cools a workpiece housed in a container 10 and includes: mist nozzles 31, 32, 33 which spray mist into the container 10; and a blower 20 which supplies outer air into the container 10 in a pressing manner so that sprayed mist is pressed to the workpiece. It is preferable that the blower 20 is connected to the container 10 through a contraction part 11 in which a passage cross section is contracted.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cooling device.

  As a method of cooling a workpiece such as a metal product heated to a high temperature by casting or the like, natural heat radiation, use of a fan, and the like have been conventionally performed, but there is a problem that cooling requires a long time. There is also a method of shortening the cooling time by immersing the work in water, but there is a possibility that a rapid temperature change of the work may cause cracking.

  In order to solve these problems, Non-Patent Document 1 discloses that a small water droplet (mist) and high-pressure air are applied to a product to reduce the size of the product by one-hundredth or less of that of a conventional natural heat radiation system or a fan air cooling system. A rapid cooling device that can cool in a short time without causing product defects is disclosed.

Chubu Electric Power Co., Inc., "Development of Rapid Cooling System" HD Blast Cooler "-Breakthrough Technology That Can Reduce Cooling Time to 1/100 or Less Compared to Conventional"-, [online], October 2017 On the 24th, Chubu Electric Power Co., Inc. web page, [Search June 22, 2018], Internet <URL: http://www.chuden.co.jp/corporate/publicity/pub_release/press/3266100_21432.html>

  The rapid cooling device disclosed in Non-Patent Literature 1 can achieve both a reduction in cooling time and prevention of product defects, but also has a risk of being restricted by an installation location due to the use of high-pressure air, and a problem of air consumption. An increase in the amount may increase the running cost, and there is room for further improvement in this respect.

  Therefore, an object of the present invention is to provide a cooling device that can quickly, easily, and at low cost cool a work while preventing the occurrence of a work defect.

  The object of the present invention is a cooling device that cools a work housed in a container, a mist nozzle that sprays mist into the container, and a mist nozzle that presses the sprayed mist onto the work. This is achieved by a cooling device including a blower for pushing in and supplying outside air.

  In this cooling device, it is preferable that the blower is connected to the container via a throttle section having a narrow flow path cross section.

  It is preferable that the container includes a first guide portion for diffusing a part of the airflow blown to one surface side of the work around the work.

  It is preferable that the container includes a second guide portion that guides the airflow diffused inside to blow the other side of the work.

  It is preferable that a plurality of the mist nozzles are arranged around the work.

  Further, it is possible to further comprise a transfer device for transferring the work so as to pass through the container. In this case, it is preferable that the blower and the mist nozzle are arranged corresponding to each cooling position so as to cool the work conveyed in the container at a plurality of cooling positions separated from each other. In this configuration, the particle size of the mist sprayed by the mist nozzle on the work conveyed to the cooling position on the upstream side in the conveyance direction is different from that of the mist nozzle on the work conveyed to the cooling position on the downstream side in the conveyance direction. Is preferably larger than the particle size of the mist to be sprayed. Further, the spray amount per unit time of the mist sprayed by the mist nozzle on the work conveyed to the cooling position on the upstream side in the conveyance direction is different from that of the mist on the work conveyed to the cooling position on the downstream side in the conveyance direction. It is preferable that the amount of the mist sprayed by the nozzle be larger than the spray amount per unit time.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a cooling device that can quickly, easily, and at low cost cool a work while preventing the occurrence of a work defect.

It is a front view of the cooling device concerning one embodiment of the present invention. It is AA sectional drawing of FIG. It is a principal part enlarged view of the cooling device shown in FIG. It is a principal part enlarged view which shows the modification of the cooling device shown in FIG. It is a front view of the cooling device concerning other embodiments of the present invention. FIG. 6 is a sectional view taken along line BB of FIG. 5.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a cooling device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 1 and 2, the cooling device 1 includes a container 10 and a blower 20.

  The container 10 is provided with a throttle 11 at an upper portion, and a supply port 12 is formed at an upper end of the throttle 11. The blower 20 is connected to the supply port 12, and the impeller 22 arranged inside the casing 21 is driven to rotate by the electric motor 23, thereby taking in outside air from the suction port 24 and passing through the throttle unit 11. The outside air is supplied into the container 10. The type of the blower 20 is not particularly limited as long as the outside air can be pushed into the container 10 and supplied, but a centrifugal fan such as a turbo fan or a sirocco fan having a high static blowing pressure can be preferably exemplified.

  The inside of the container 10 is formed so that the circular flow path cross section is narrowed in the throttle portion 11 and then expands downward in a tapered shape. A constricted portion 19 is formed in the lower portion of the container 10, and the inside of the constricted portion 19 is formed so as to expand again in a tapered shape below the constricted portion 19. A curved portion 10 a is formed on the inner wall surface of the container 10 above the constricted portion 19, and the curved portion 10 a guides the airflow toward the center of the container 10. At the lower end of the container 10, an outlet 13 for discharging an airflow is formed. The discharge port 13 is arranged so that the center line of the narrowed portion 11 extending in the vertical direction passes through the center.

  A grid-like mounting table 15 is provided above the constricted portion 19, and the work W can be mounted on the mounting table 15 via a door 14 provided on the side wall of the container 10 so as to be openable and closable.

  A plurality of mist nozzles 31, 32, and 33 are provided inside the container 10 so as to surround the work W mounted on the mounting table 15. That is, the first mist nozzle 31 and the second mist nozzle 32 are respectively arranged at the upper part and the lower part of the container 10, and the third mist nozzle 33 is arranged around the same height as the work W in the circumferential direction. Are arranged at intervals of 90 degrees. The first mist nozzle 31, the second mist nozzle 32, and the third mist nozzle 33 are connected to a water supply source (neither shown) such as a water pipe or a water storage tank through a pressurizing pump or an on-off valve as appropriate. The mist is sprayed toward the work W, and is supported by a bracket (not shown). The liquid to be sprayed is not limited to tap water. For example, a liquid having a low viscosity and evaporating at about 40 to 150 ° C., such as alcohols such as methanol, ethanol, and propanol, and chlorofluorocarbon is used. Is also good. The mist nozzles 31, 32, 33 may be one-fluid nozzles, or may be two-fluid nozzles that mix with compressed air.

  Further, inside the container 10, a first guide portion 41 and a second guide portion 42 for guiding an airflow introduced into the container 10 via the throttle portion 11 are provided. The first guide portion 41 is provided near the throttle portion 11 and includes a plurality of ribs 41 a radially provided on the inner wall surface of the container 10. The second guide portion 42 is supported near the lower part of the mounting table 15 by a support rod (not shown) extending from the inner wall surface of the container 10 and has a guide groove 42a. The guide groove 42 a has a bottom surface facing the work W, and is formed in a ring shape so as to surround the second mist nozzle 32.

  The cooling device 1 having the above configuration activates the blower 20 and activates the first mist nozzle 31, the second mist nozzle 32, and the third mist nozzle 33, so that the outside air and the mist Is supplied.

  FIG. 3 is a cross-sectional view showing the inside of the container 10 in an enlarged manner, and the air flow and the mist flow in the container 10 are indicated by broken arrows. When the work W mounted on the mounting table 15 has a rectangular parallelepiped shape, the first mist nozzle 31, the second mist nozzle 32, and the third mist nozzle 33 face the upper surface, the lower surface, and the side surface of the work W, respectively. Mists M1, M2, M3 are injected. The airflow introduced into the container 10 is rectified by passing through the throttle unit 11 and is introduced into the container 10 with a uniform flow velocity distribution. The airflow F1 that has passed through the center of the cross section of the throttle unit 11 is blown onto the upper surface of the work W, and presses the mist M1 sprayed from the first mist nozzle 31 against the upper surface of the work W.

  On the other hand, the airflow that has passed through the peripheral edge of the cross section of the throttle unit 11 is diffused along the inner wall surface of the container 10. In the present embodiment, the first guide portion 41 is provided in the vicinity of the throttle portion 11, so that the airflow passing through the peripheral edge of the cross section of the throttle portion 11 can be more reliably diffused. The first guide portion 41 is not limited to the rib-shaped member of the present embodiment, and may be, for example, a member having a lattice-like or slit-like structure.

  Among the airflows diffused in the container 10, the airflow F3 guided mainly by the curved surface 10a is blown to the side surface of the work W, and pushes the mist M3 sprayed from the third mist nozzle 33 to the side surface of the work W. Hit it. Further, of the airflow that has passed through the constricted portion 19, the airflow F2 mainly guided by the second guide portion 42 is blown onto the lower surface of the work W via the grid-shaped mounting table 15, and the second mist nozzle 42 The mist M2 sprayed from above is pressed against the lower surface of the work W. Thus, the airflow blown to each surface of the workpiece W passes around the second guide portion 42 and is discharged to the outside.

  As described above, the cooling device 1 of the present embodiment can press the mist sprayed into the container 10 against the entire surface of the work W, so that a high cooling effect can be obtained. That is, the mist adhering to the work W evaporates near the surface of the work W when the work W is still at a high temperature (for example, about 140 to 300 ° C.), and forms a vapor film between the work W and the mist. Although there is a possibility that a so-called Leidenfrost phenomenon, which lowers the cooling efficiency, may occur, but the cooling device 1 of the present embodiment can surely press the mist onto the entire work W, so that the heat transfer from the work W to the mist is performed. And the entire work W can be efficiently cooled. Therefore, the work can be cooled quickly while preventing the occurrence of the work defect.

  Furthermore, since the cooling device 1 of the present embodiment can reliably cool a wide range of the work W by the operation of the blower 20, it is not necessary to use a large amount of high-pressure air, and the work can be cooled easily and at low cost. It can be carried out.

  The spray amount per unit time of the mist sprayed from the mist nozzles 31, 32, and 33 during the operation of the blower 20 may be constant, but the spray amount may be reduced over time or the spray amount may be reduced. The operation control of the mist nozzles 31, 32, and 33 may be performed so as to stop the operation, so that it is possible to reliably prevent moisture from remaining on the cooled work W.

  As mentioned above, although one Embodiment of this invention was described in full detail, the specific aspect of this invention is not limited to the said Embodiment. For example, the shape of the work W is not limited to a rectangular parallelepiped shape, and may be an arbitrary three-dimensional shape. For example, a metal product or a ceramic product having various shapes heated to a high temperature by quenching or the like is quickly cooled. Can be. The number and arrangement of the mist nozzles 31, 32, and 33 are not particularly limited, and may be configured so that the mist is pressed against the entire surface of the work W by the air current. For example, when the work W is in the form of a thin plate, the configuration may be such that only the first mist nozzle 31 and the second mist nozzle 32 are provided without providing the third mist nozzle 33. The mist nozzles 31, 32, and 33 may be configured such that the spray position and the spray direction can be adjusted according to the shape and size of the work W. Although the container 10 of the present embodiment is formed in a conical shape, the shape of the container 10 is not particularly limited. For example, the container 10 is formed in a square pyramid shape, and the It can also be configured to narrow the cross section.

  Further, in the present embodiment, the first guide portion 41 and the second guide portion 42 diffuse and converge the airflow, respectively, so that the one side (for example, the upper surface) and the other side (for example, the surface) of the workpiece W are provided. Although the configuration is such that the airflow is reliably blown to the lower surface), the airflow in the container 10 can be controlled by the shape of the inner wall surface of the container 10 and the like, and the first guide portion 41 and the second A configuration without one or both of the two guide portions 42 may be adopted.

  Further, in the present embodiment, the mist M1, M2, M3 is sprayed from each of the mist nozzles 31, 32, 33 toward the work W, and the air flows F1, F2, F3 from around the mist M1, M2, M3 are applied to the work W. The mist is surely pressed against the surface of the work W by spraying on the surface of the workpiece W. For example, as shown in FIG. 4A, the flow direction of the air flow F flowing along the inner wall surface of the container 10 The mist nozzle 30 may be disposed so as to spray the mist M along the mist M, and the mist M may be placed on the airflow F and pressed against the work. The mist nozzle 30 can be attached to the inner wall surface of the container 10 via, for example, a bracket 30a.

  Alternatively, as shown in FIG. 4B, the mist M is sprayed from the mist nozzle 30 so as to intersect with the airflow F generated in the container 10, and the mist M is mixed with the airflow F and pressed against the surface of the work W. You can also. In this case, if the mist M is sprayed from the outside of the air flow F, the mist M is repelled by the air flow F, and there is a possibility that the mist M and the air flow F are not mixed well. It is preferable to arrange the tip 30b in the airflow F. Accordingly, the sprayed mist M can be reliably transported to the surface of the work together with the airflow F, and the work can be cooled quickly.

  Further, the cooling device 1 of the present embodiment has a batch type configuration in which the work is cooled in a stationary state, but may have a continuous configuration in which a plurality of works are cooled while being sequentially transported. FIG. 5 is a front view showing an example of the continuous cooling device 101, and FIG. 6 is a sectional view taken along line BB of FIG. In the cooling device 101 shown in FIGS. 5 and 6, the same components as those of the cooling device 1 shown in FIG. 1 and the like are denoted by the same reference numerals.

  As shown in FIGS. 5 and 6, the cooling device 101 has the container 10 provided on the upper surface of the base 50 and includes a transport device 51 formed of a belt conveyor. The transfer device 51 includes a net-shaped conveyor belt 51a formed in an endless shape. The work W mounted on the conveyor belt 51a is horizontally transferred in a direction indicated by an arrow T to transfer the work W from the entrance 10b to the container. 10 and discharged from the outlet 10c.

  A plurality of blowers 20 are connected to the container 10 so that the work W can be cooled at a first cooling position P1 and a second cooling position P2 which are transfer positions separated from each other. A first mist nozzle 31 and a third mist nozzle 33 are provided at each of the first cooling position P1 and the second cooling position P2, and the sprayed mist is sent from the blower 20 to the first guide. The airflow guided by the portion 41 can press the workpiece W. The arrangement of the mist nozzles and the air flow guide structure can be variously modified in the same manner as the cooling device 1 shown in FIG. 1 and the like. The airflow in the container 10 rises in the exhaust duct 16 installed between the plurality of blowers 20 and is discharged from the outlet 13.

  A steam trap for collecting mist sprayed into the container 10 may be provided near the inlet 10b and the outlet 10c of the container 10. Further, the number of cooling positions in the container 10 may be three or more, and a partition plate may be appropriately provided in the container 10 so that a desired airflow is generated at each cooling position.

  Since the cooling device 101 having the above configuration can rapidly cool the work W at the plurality of cooling positions P1 and P2, even if the transfer speed of the transfer device 51 is increased, the work W can be reliably cooled. it can. Therefore, a large number of works W can be efficiently cooled.

  The particle size of the mist sprayed on the work W at the first cooling position P1 on the upstream side in the transfer direction is larger than the particle size of the mist sprayed on the work W at the second cooling position P2 on the downstream side in the transfer direction. Is preferred. Thereby, while the work W is at a high temperature (for example, 500 ° C. to 100 ° C.), the cooling of the work W can be promoted by the mist having a large particle size at the first cooling position P1, while the temperature of the work W is increased. After the temperature decreases (for example, lower than 100 ° C.), it is possible to promote evaporation of the mist having a small particle diameter at the second cooling position P2, and to reliably prevent moisture from remaining on the cooled work W. it can.

  Alternatively, the spray amount per unit time of the mist sprayed on the work W at the first cooling position P1 may be larger than the spray amount per unit time of the mist sprayed on the work W at the second cooling position P2. Often, this also provides the same effects as described above. Further, the control of the mist particle size and the control of the mist spray amount at the first cooling position P1 and the second cooling position P2 described above may be used in combination.

1, 101 Cooling device 10 Container 11 Throttle section 20 Blower 31 First mist nozzle 32 Second mist nozzle 33 Third mist nozzle 41 First guide section 42 Second guide section 51 Transport device W Work P1 First Cooling position P2 second cooling position

Claims (8)

A cooling device for cooling a work housed in the container,
A mist nozzle that sprays mist into the container,
A cooling device comprising: a blower for pushing and supplying outside air into the container so as to press the sprayed mist against the work.   2. The cooling device according to claim 1, wherein the blower is connected to the container via a throttle unit having a narrowed flow channel cross section. 3.   The cooling device according to claim 1, wherein the container includes a first guide unit that diffuses a part of an airflow blown to one surface side of the work around the work.   The cooling device according to any one of claims 1 to 3, wherein the container includes a second guide portion that guides the airflow diffused therein to be blown toward the other surface of the work.   The cooling device according to any one of claims 1 to 4, wherein a plurality of the mist nozzles are arranged around the work. The apparatus further includes a transfer device that transfers the work so as to pass through the inside of the container,
The said blower and the mist nozzle are arrange | positioned corresponding to each cooling position so that the workpiece | work conveyed in the said container may be cooled at the several cooling position separated from each other, The cooling device according to any one of claims 1 to 5. Cooling device.   The particle size of the mist sprayed by the mist nozzle on the work conveyed to the cooling position on the upstream side in the conveyance direction is the particle size of the mist sprayed by the mist nozzle on the work conveyed to the cooling position on the downstream side in the conveyance direction. The cooling device according to claim 6, which is larger than the particle size.   The spray amount per unit time of the mist sprayed by the mist nozzle on the work transported to the cooling position on the upstream side in the transport direction is different from that of the mist nozzle on the workpiece transported to the cooling position on the downstream side in the transport direction. The cooling device according to claim 6, wherein the amount of the sprayed mist is larger than the spray amount per unit time.

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