JP7430315B2 - Cooling system - Google Patents

Description

The present invention relates to a cooling device.

Natural heat radiation and the use of fans have been conventionally used as methods for cooling works such as metal products that have been heated to high temperatures by casting or the like, but there is a problem in that cooling takes a long time. Another method is to shorten the cooling time by soaking the workpiece in water, but there is a risk that cracks may occur due to sudden temperature changes in the workpiece.

Therefore, in order to solve these problems, Non-Patent Document 1 states that by applying minute water droplets (mist) and high-pressure air to the product, the product can be heated to less than 1/100th of the conventional natural heat dissipation method or fan air cooling method. A rapid cooling device is disclosed that can cool the product in a short period of time without causing product defects.

Chubu Electric Power Co., Ltd., “Development of rapid cooling device “HD Blast Cooler” - Groundbreaking technology that can reduce cooling time to less than 1/100 compared to conventional methods,” [online], October 2017. 24th, Chubu Electric Power Co., Ltd. webpage, [searched on 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 Document 1 can reduce the cooling time and prevent product defects, but because it uses high-pressure air, there is a risk of restrictions on the installation location and air consumption. There is a risk that running costs will increase due to an increase in the amount, and there is room for further improvement in this respect.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cooling device that can cool a workpiece quickly, easily, and at low cost while preventing the occurrence of defects in the workpiece.

The object of the present invention is to provide a cooling device for cooling a workpiece housed in a container, which comprises: a mist nozzle that sprays mist into the container; The mist nozzle is arranged so as to spray mist toward the workpiece, and the mist nozzle is arranged to spray mist toward the workpiece, and the mist is pressed against the surface of the workpiece by the airflow in the container, thereby dispersing the mist from the workpiece. The workpiece is cooled by promoting heat transfer .

Preferably, the container includes a first guide portion that diffuses a part of the airflow blown onto one side of the workpiece around the workpiece.

Preferably, the container includes a second guide portion that guides the airflow diffused inside the container so as to blow it toward the other surface of the workpiece.

Preferably, a plurality of the mist nozzles are arranged around the workpiece, and the mist sprayed into the container is preferably pressed against the entire surface of the workpiece by an airflow inside the container.

Moreover, it is possible to further include a conveyance device that conveys the work so as to pass through the inside of the container. In this case, it is preferable that the blower and the mist nozzle are arranged corresponding to each cooling position so that the workpiece being conveyed in the container is cooled at a plurality of cooling positions spaced apart from each other. In this configuration, the particle size of the mist sprayed by the mist nozzle to the workpiece transported to the cooling position on the upstream side in the transport direction is smaller than that of the mist sprayed on the workpiece transported to the cooling position on the downstream side in the transport direction. is preferably larger than the particle size of the mist to be sprayed. Further, the amount of mist sprayed by the mist nozzle per unit time to the workpiece transported to the cooling position on the upstream side of the transport direction is such that the amount of mist sprayed per unit time to the workpiece transported to the cooling position on the downstream side of the transport direction is It is preferable that the amount of mist sprayed by the nozzle is larger than the amount of mist sprayed per unit time.

According to the present invention, it is possible to provide a cooling device that can cool a workpiece quickly, easily, and at low cost while preventing the occurrence of defects in the workpiece.

FIG. 1 is a front view of a cooling device according to an embodiment of the present invention. 2 is a sectional view taken along line AA in FIG. 1. FIG. FIG. 3 is an enlarged view of main parts of the cooling device shown in FIG. 2. FIG. FIG. 3 is an enlarged view of essential parts of a modification of the cooling device shown in FIG. 2; It is a front view of the cooling device concerning other embodiments of the present invention. 6 is a sectional view taken along line BB in FIG. 5. FIG.

Embodiments of the present invention will be described below 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 sectional view taken along line AA in 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 constriction part 11 at the top thereof, and a supply port 12 is formed at the upper end of the constriction part 11. The blower 20 is connected to the supply port 12 , and an impeller 22 disposed inside the casing 21 is rotationally driven by an electric motor 23 to take in outside air from the suction port 24 and pass it through the throttle section 11 . Outside air is supplied into the container 10. The type of blower 20 is not particularly limited as long as it can push and supply outside air into the container 10, but centrifugal fans such as turbo fans and sirocco fans with high blowing static pressure can be preferably exemplified.

The inside of the container 10 is formed so that a circular cross-section of the flow path is narrowed in the narrowing part 11 and then expands downward in a tapered shape. A constriction part 19 is formed at the lower part of the container 10, and the inside is formed so as to expand into a tapered shape again below the constriction part 19. A curved portion 10a is formed on the inner wall surface of the container 10 above the constricted portion 19, and the airflow is guided toward the center of the container 10 by this curved portion 10a. A discharge port 13 is formed at the lower end of the container 10 to discharge the airflow. The discharge port 13 is arranged so that the center line of the aperture portion 11 extending in the vertical direction passes through the center.

A lattice-shaped mounting table 15 is provided at the upper part of the constricted portion 19, and the workpiece 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.

Inside the container 10, a plurality of mist nozzles 31, 32, and 33 are provided so as to surround the workpiece W mounted on the mounting table 15. That is, a first mist nozzle 31 and a second mist nozzle 32 are arranged at the upper and lower parts of the container 10, respectively, and a third mist nozzle 33 is arranged around the workpiece W at approximately the same height as the work W in the circumferential direction. There are four arranged at 90 degree intervals. The first mist nozzle 31, the second mist nozzle 32, and the third mist nozzle 33 are connected to a water supply source such as a water pipe or a water storage tank (all not shown) via a pressurizing pump or an on-off valve as appropriate. The workpiece W is supported by a bracket (not shown) so as to spray mist toward the workpiece W. The liquid to be sprayed is not limited to tap water; for example, liquids that have low viscosity and evaporate at about 40 to 150 degrees Celsius, such as alcohols such as methanol, ethanol, and propanol, or chlorofluorocarbons, may be used. Good too. The mist nozzles 31, 32, 33 may be single-fluid nozzles or may be two-fluid nozzles that mix with compressed air.

Furthermore, inside the container 10, a first guide section 41 and a second guide section 42 are provided that guide the airflow introduced into the container 10 via the constriction section 11. The first guide portion 41 is provided near the constriction 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 bottom of the mounting table 15 by a support rod (not shown) extending from the inner wall surface of the container 10, and includes a guide groove 42a. The guide groove 42a has a bottom surface facing the workpiece 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 operates the air blower 20 and also operates the first mist nozzle 31, the second mist nozzle 32, and the third mist nozzle 33, thereby causing outside air and mist to flow into the container 10. is supplied.

FIG. 3 is an enlarged sectional view of the inside of the container 10, and the airflow and mist flow within the container 10 are indicated by broken arrows. When the workpiece W mounted on the mounting table 15 has a rectangular parallelepiped shape, from the first mist nozzle 31, the second mist nozzle 32, and the third mist nozzle 33, toward the upper surface, lower surface, and side surface of the workpiece W, respectively. Mists M1, M2, and M3 are injected. The airflow introduced into the container 10 is rectified by passing through the constriction part 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 section 11 is blown onto the upper surface of the workpiece W, and the mist M1 sprayed from the first mist nozzle 31 is pressed against the upper surface of the workpiece W.

On the other hand, the airflow that has passed through the peripheral edge of the cross section of the throttle section 11 is diffused along the inner wall surface of the container 10. In this embodiment, since the first guide section 41 is provided near the constriction section 11, the airflow passing through the peripheral edge of the cross section of the constriction section 11 can be more reliably diffused. The first guide portion 41 is not limited to the rib-like structure of this embodiment, but may be a member having a grid-like or slit-like structure, for example.

Among the airflows diffused in the container 10, the airflow F3 mainly guided by the curved surface 10a is blown onto the side surface of the workpiece W, and pushes the mist M3 sprayed from the third mist nozzle 33 onto the side surface of the workpiece W. guess. In addition, among the airflows that have passed through the constriction part 19, the airflow F2 that is mainly guided by the second guide part 42 is blown onto the lower surface of the workpiece W via the grid-shaped mounting table 15, and is directed to the second mist nozzle 42. The mist M2 sprayed from is pressed against the lower surface of the workpiece W. In this way, the airflow blown onto each surface of the workpiece W passes around the second guide portion 42 and is discharged to the outside.

In this way, the cooling device 1 of the present embodiment can press the mist sprayed into the container 10 onto the entire surface of the workpiece W, so that a high cooling effect can be obtained. That is, the mist attached to the workpiece W evaporates near the surface of the workpiece W when the workpiece W is still at a high temperature (for example, about 140 to 300°C), forming a vapor film between the workpiece W and the mist. Although there is a risk that the so-called Leidenfrost phenomenon, which reduces cooling efficiency, may occur, the cooling device 1 of this embodiment can reliably press the mist onto the entire workpiece W, so that heat transfer from the workpiece W to the mist is prevented. This allows the entire workpiece W to be efficiently cooled. Therefore, the workpiece can be cooled quickly while preventing the occurrence of defects in the workpiece.

Furthermore, the cooling device 1 of this embodiment can reliably cool a wide area of the workpiece W by operating the blower 20, so there is no need to use a large amount of high-pressure air, and the workpiece can be cooled easily and at low cost. It can be carried out.

The amount of mist sprayed from the mist nozzles 31, 32, and 33 per unit time while the blower 20 is operating may be constant, but the amount of mist may be reduced over time or the amount of mist may be reduced over time. The operation of the mist nozzles 31, 32, and 33 may be controlled so as to stop the mist nozzles 31, 32, and 33, thereby reliably preventing moisture from remaining in the workpiece W after cooling.

Although one embodiment of the present invention has been described in detail above, specific aspects of the present invention are not limited to the above embodiment. For example, the shape of the workpiece W is not limited to a rectangular parallelepiped shape, but may be any three-dimensional shape, and can quickly cool metal products, ceramic products, etc. of various shapes that have become hot due to quenching etc. I can do it. There are no particular restrictions on the number or arrangement of the mist nozzles 31, 32, 33, and they may be configured so that the mist is pressed against the entire surface of the workpiece W by the airflow. For example, when the workpiece W is in the shape of a thin plate, the third mist nozzle 33 may not be provided, and only the first mist nozzle 31 and the second mist nozzle 32 may be provided. The mist nozzles 31, 32, and 33 may be configured so that the spray position, spray direction, etc. can be adjusted depending on the shape and size of the workpiece W. Further, although the container 10 of this embodiment is formed into a conical shape, there is no particular restriction on the shape of the container 10. For example, the container 10 may be formed into a square pyramid shape, and the constricted portion 11 may have a square flow channel. It can also be configured to narrow the cross section.

In addition, in this embodiment, the first guide part 41 and the second guide part 42 diffuse and converge the airflow, respectively, so that one surface side (for example, the upper surface) and the other surface side (for example, Although the structure is configured to reliably blow the airflow to the lower surface of the container 10, it is also possible to control the airflow inside the container 10 depending on the shape of the inner wall surface of the container 10, etc. It is also possible to adopt a configuration in which one or both of the two guide portions 42 are not provided.

In addition, in this embodiment, mist M1, M2, M3 is sprayed from each mist nozzle 31, 32, 33 toward the workpiece W, and airflows F1, F2, F3 are directed from around the mist M1, M2, M3 to the workpiece W. The configuration is such that the mist is reliably pressed against the surface of the workpiece W by spraying the mist onto the surface of the workpiece W. For example, as shown in FIG. The mist nozzle 30 may be arranged so as to spray the mist M along the air flow F, or the mist M may be placed on the airflow F and pressed against the workpiece. The mist nozzle 30 can be attached to the inner wall surface of the container 10, for example, via a bracket 30a.

Alternatively, as shown in FIG. 4(b), 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 workpiece W. You can also do that. In this case, if the mist M is sprayed from outside the airflow F, the mist M will be repelled by the airflow F, and there is a risk that the mist M and the airflow F will not mix well. Preferably, the tip 30b is placed within the airflow F. Thereby, the sprayed mist M can be reliably conveyed to the surface of the workpiece together with the airflow F, and the workpiece can be cooled quickly.

Furthermore, although the cooling device 1 of this embodiment has a batch-type configuration in which the workpieces are cooled in a stationary state, it is also possible to have a continuous-type configuration in which the plurality of workpieces are cooled while being sequentially conveyed. 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 in FIG. In the cooling device 101 shown in FIGS. 5 and 6, the same components as those in the cooling device 1 shown in FIG. 1 etc. are denoted by the same reference numerals.

As shown in FIGS. 5 and 6, the cooling device 101 includes a container 10 provided on the upper surface of a base 50, and a conveying device 51 consisting of a belt conveyor. The conveyance device 51 includes an endless net-like conveyor belt 51a, and horizontally conveys the workpiece W mounted on the conveyor belt 51a in the direction of arrow T, thereby transferring the workpiece W from the inlet 10b to the container. 10 and discharged from the outlet 10c.

A plurality of blowers 20, 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 transport positions spaced apart from each other. A first mist nozzle 31 and a third mist nozzle 33 are provided at the first cooling position P1 and the second cooling position P2, respectively, and the sprayed mist is transferred from the blower 20 to the first guide. It can be pressed against the workpiece W by the airflow guided by the section 41. The arrangement of the mist nozzles and the airflow guide structure can be modified in various ways, similar to the cooling device 1 shown in FIG. 1 and the like. The airflow within the container 10 ascends through an exhaust duct 16 installed between the plurality of blowers 20 and is discharged from the exhaust port 13.

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

The cooling device 101 having the above configuration can quickly cool the work W at the plurality of cooling positions P1 and P2, so even if the transport speed of the transport device 51 is increased, the work W cannot be reliably cooled. can. Therefore, a large number of works W can be efficiently cooled.

The particle size of the mist sprayed onto the work W at the first cooling position P1 on the upstream side in the transport 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 transport direction. is preferred. As a result, when the workpiece W is at a high temperature (for example, 500°C to 100°C), the cooling of the workpiece W can be promoted by the mist with large particle size at the first cooling position P1, while the temperature of the workpiece W is After the temperature decreases (for example, below 100° C.), it is possible to promote the evaporation of mist with small particle size at the second cooling position P2 to reliably prevent moisture from remaining in the workpiece W after cooling. can.

Alternatively, the amount of mist sprayed onto the workpiece W at the first cooling position P1 per unit time may be made larger than the amount of mist sprayed onto the workpiece W per unit time at the second cooling position P2. In this case, the same effect as above can be obtained. Furthermore, the control of the mist particle size and the control of the amount of mist sprayed at the first cooling position P1 and the second cooling position P2 described above may be used together.

1,101 Cooling device 10 Container 11 Squeezing section 20 Air blower 31 First mist nozzle 32 Second mist nozzle 33 Third mist nozzle 41 First guide section 42 Second guide section 51 Conveying device W Work P1 First Cooling position P2 Second cooling position

Claims (7)

A cooling device that cools a workpiece housed in a container,
a mist nozzle that sprays mist into the container;
and a blower that pushes and supplies outside air into the container so as to press the sprayed mist against the workpiece,
The mist nozzle is arranged to spray mist toward the workpiece,
Cooling the workpiece by pressing the mist against the surface of the workpiece by airflow in the container to promote heat transfer from the workpiece to the mist ,
The blower is a cooling device that is connected to the container via a constriction section in which a cross section of the flow path is constricted . The cooling device according to claim 1 , wherein the container includes a first guide portion that diffuses a part of the airflow blown onto one side of the work around the work. 3. The cooling device according to claim 2, wherein the container includes a second guide portion that guides the airflow diffused inside the container so as to blow it toward the other surface of the workpiece. A plurality of the mist nozzles are arranged around the workpiece,
The cooling device according to any one of claims 1 to 3 , wherein the mist sprayed into the container is pressed against the entire surface of the workpiece by an airflow inside the container. further comprising a transport device that transports the workpiece so as to pass through the container,
The cooling device according to claim 1 or 2 , wherein the blower and the mist nozzle are arranged corresponding to each cooling position so that the workpiece being conveyed in the container is cooled at a plurality of cooling positions spaced apart from each other. . The particle size of the mist sprayed by the mist nozzle on the workpiece transported to the cooling position on the upstream side in the transport direction is such that the particle size of the mist sprayed by the mist nozzle on the workpiece transported to the cooling position on the downstream side in the transport direction is The cooling device according to claim 5, wherein the cooling device is larger than the particle size. The amount of mist sprayed by the mist nozzle per unit time on the workpiece transported to the cooling position on the upstream side in the transport direction is such that the amount of mist sprayed by the mist nozzle per unit time on the workpiece transported to the cooling position on the downstream side in the transport direction is The cooling device according to claim 5 or 6, wherein the amount of mist to be sprayed is larger than the amount of mist to be sprayed per unit time.

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