CN112789357A

CN112789357A - Cooling device

Info

Publication number: CN112789357A
Application number: CN201980063954.8A
Authority: CN
Inventors: 坂本治; 中本一朗
Original assignee: IHI Corp; IHI Machinery and Furnace Co Ltd
Current assignee: IHI Corp; IHI Machinery and Furnace Co Ltd
Priority date: 2018-09-27
Filing date: 2019-09-24
Publication date: 2021-05-11
Anticipated expiration: 2039-09-24
Also published as: CN112789357B; JP6964199B2; WO2020066967A1; DE112019004894T5; JPWO2020066967A1

Abstract

The disclosed cooling device (R, R1) for cooling an object to be treated (W) by immersing the object in a cooling liquid from below, is provided with at least a liquid supply unit (20) for supplying the cooling liquid to the upper part of the object (W) when the object (W) to be treated starts to be cooled.

Description

Cooling device

Technical Field

The present disclosure relates to a cooling device.

The present application claims priority based on japanese patent application No. 2018-181990, filed in japanese application at 27.9.2018, and the contents thereof are incorporated herein.

Background

For example, patent document 1 discloses a quenching apparatus for immersing and cooling a workpiece in a cooling tank. In such a quenching apparatus, in order to prevent variation in oil temperature, oil in the cooling tank is circulated from below the object to above the object by the circulation device, and a flow of oil is formed with respect to the object.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016 & 211026

Disclosure of Invention

Technical problem to be solved by the invention

However, the object to be treated is lowered by a lifting device or the like and immersed in the cooling bath. Therefore, immediately after the start of cooling, the temperature of the lower portion of the object tends to be lower than that of the upper portion. Further, a circulation flow of the cooling oil flowing to the lower portion of the object to be treated is formed in the cooling tank. Therefore, the lower portion of the object to be treated is preferentially cooled, resulting in an increase in the temperature difference between the lower portion and the upper portion. That is, it is considered that the temperature histories at the upper and lower portions of the object to be processed are different in the cooling device of the above-described configuration.

The present disclosure has been made in view of the above circumstances, and an object thereof is to uniformly cool an object to be processed.

Solution for solving the above technical problem

A cooling device according to claim 1 of the present disclosure is a cooling device for cooling an object to be processed by immersing the object in a cooling liquid from a lower portion, and includes a liquid supply unit configured to supply the cooling liquid to an upper portion of the object to be processed at least when cooling of the object to be processed is started.

The cooling apparatus according to claim 2 is the cooling apparatus according to claim 1, wherein the liquid supply unit includes: a liquid feeding device for feeding the coolant on the lower side of the object to be processed to the upper side; and a duct that is provided above the object to be processed in the cooling liquid and guides the cooling liquid flowing in from the liquid feeding device to an upper portion of the object to be processed.

The cooling apparatus according to claim 3 is the cooling apparatus according to claim 1, wherein the liquid feeding device is configured to feed the cooling liquid on the upper side of the object to be processed to the lower side after a predetermined time has elapsed from the start of cooling the object to be processed.

The cooling apparatus according to claim 4 is the cooling apparatus according to claim 1, further comprising a moving mechanism for moving the duct from outside the cooling liquid to above the object to be treated in the cooling liquid.

The cooling device according to claim 5 is the cooling device according to claim 1, wherein a liquid feeding device duct is provided, which is connected to the duct and extends in a vertical direction in the cooling liquid, and the liquid feeding device is provided inside the liquid feeding device duct.

The cooling device according to claim 6 is the cooling device according to claim 1, wherein a flow regulating plate is provided in the liquid feeding device duct and regulates the flow of the cooling liquid.

The cooling apparatus according to claim 7 is the cooling apparatus according to claim 1, further comprising a guide plate provided at a side of the object to be treated and guiding the cooling liquid to flow along the object to be treated.

The cooling device according to claim 8 is the cooling device according to claim 1, wherein the cooling device further comprises an attitude changing unit configured to change an attitude of the guide plate.

Effects of the invention

According to the present disclosure, the object to be treated can be uniformly cooled.

Drawings

Fig. 1 is a longitudinal sectional view schematically showing a schematic configuration of a cooling device according to embodiment 1 of the present disclosure.

Fig. 2 is a sectional view a-a of fig. 1.

Fig. 3 is a longitudinal sectional view schematically showing a schematic configuration of a cooling device according to embodiment 2 of the present disclosure.

Detailed Description

[ embodiment 1 ]

Fig. 1 is a longitudinal sectional view schematically showing a schematic configuration of a cooling device R according to the present embodiment. Further, fig. 2 is a sectional view a-a of fig. 1. The cooling apparatus R of the present embodiment is installed in, for example, a two-chamber vacuum carburizing furnace, and cools the heated object to be treated W. As shown in fig. 1 and 2, the cooling device R includes an oil tank 1 (cooling tank), a conveyance chamber 2, a processed

object lifting device

3, 4 oil transfer devices 4 (liquid transfer devices), 4 upper ducts 5 (ducts), a duct lifting device 6 (moving mechanism), 4 propeller ducts 7 (liquid transfer device ducts), 4 lower ducts 8, a guide plate 9, and a grid 10. Two upper ducts 5, oil transfer device 4, propeller duct 7, and lower duct 8 are provided in pair, and two rows are provided in the inward direction in fig. 1. The upper duct 5, the oil delivery device 4, the propeller duct 7, and the lower duct 8 constitute a liquid supply unit (20) in the present disclosure.

The oil tank 1 is a tank in which the cooling oil Y is stored in advance and which has a capacity capable of accommodating the object to be cooled, i.e., the object W to be treated. The object W to be treated is cooled by being immersed in the cooling oil Y in the oil bath 1. Hereinafter, the region of the oil bath 1 in which the object W to be treated can be placed during cooling is referred to as a mounting region a. Further, since the shape of the object W is various, the actual shape of the object W does not necessarily coincide with the placement area a.

The transfer chamber 2 is disposed above the oil sump 1. The conveyance chamber 2 is equivalent to a chamber for temporarily retaining the object W to be treated which enters and exits from the oil bath 1. The transport chamber 2 is connected to a heating chamber, not shown, for example, and functions as a chamber for delivering the object W to be processed to the heating chamber. That is, the conveyance chamber 2 conveys the object W to be processed to and from the oil bath 1 or a heating chamber not shown.

The object-to-be-treated lifting device 3 includes a fork 3a on which the object to be treated W is placed in advance, and the fork 3a is lifted and lowered by a drive mechanism, not shown, to convey the object to be treated W between the oil bath 1 and the conveyance chamber 2. The object W to be treated is immersed in the cooling oil stored in the oil tank 1 while being placed on the forks 3a, and is cooled in the oil tank 1 while being placed on the forks 3 a. In fig. 1, only the fork 3a of the object lifter 3 is shown, and other components are omitted.

As shown in fig. 2, the oil delivery device 4 is provided with 2, 4 in the present embodiment, on one side and the other side of the mounting area a. As shown in fig. 1, each oil feed device 4 includes a motor 4a, a shaft 4b, and a propeller 4 c.

The motor 4a is fixed to the bottom of the sump 1. The motor 4a generates power for rotating the propeller 4 c. The upper end of the shaft 4b is connected to the motor 4a and is vertically disposed. The lower end side of the shaft 4b is disposed in advance below the liquid surface of the cooling oil Y stored in the oil tank 1, and a propeller 4c is provided.

The propeller 4c is a propeller provided on the shaft 4 b. The propeller 4c is disposed below the liquid surface of the cooling oil Y stored in the oil tank 1 and on the side of the placement area a, and rotates together with the shaft 4b to deliver the cooling oil Y to the upper side or the lower side. The propeller 4c can change the flow direction of the cooling oil Y by changing the rotation direction. As shown in fig. 2, in all the 4 oil feed devices 4 of the present embodiment, the propellers 4c rotate in the same direction. In addition, the arrow in fig. 2 shows the rotation direction of the propeller. In fig. 2, the rotation direction of the propeller is clockwise as an example, but may be counterclockwise.

The upper duct 5 is a duct provided on the side of the object lifting device 3 where the object W to be processed is disposed, that is, provided above. In a state where the object W is immersed in the oil bath 1, the inlet 5a of the upper duct 5 and the outlet of the propeller duct 7 are connected, and the outlet 5b is disposed above the object W and near the oil surface of the cooling oil Y. Further, the upper duct 5 is previously separated from the propeller duct 7 and can be moved in the up-and-down direction by the duct elevating device 6.

The pipe lifting device 6 includes a shaft 6a, a motor 6b, and a pipe hanging portion 6 c. The shaft 6a is provided in the vertical direction along the side wall in the conveyance chamber 2. The shaft 6a has an upper end exposed to the outside of the transfer chamber 2 and a lower end disposed above the liquid surface of the oil bath 1.

The motor 6b is a servo motor mounted on the upper end of the shaft 6 a. That is, the motor 6b is exposed to the outside of the conveyance chamber 2. The motor 6b generates power for raising and lowering the pipe hanging portion 6c under the control of a control device, not shown.

The pipe suspended portion 6c is a member for supporting 4 upper pipes 5 in a state suspended from the upper portion. Further, the pipe hanger 6c is attached to the shaft 6a so as to be movable in the vertical direction. Thus, the pipe suspended portion 6c is vertically moved by the motor 6b in a state of suspending and supporting 4 upper pipes 5.

The propeller duct 7 is a cylindrical duct surrounding the propeller 4c of the oil feeder 4, and an outlet at the upper end is connected to the inlet 5a of the upper duct 5, and an inlet at the lower end is connected to the lower duct 8. The propeller pipes 7 are provided in 4 places in total in the present embodiment, as shown in fig. 2, for each oil sending device 4. These propeller channels 7 prevent the flow generated by the rotation of the propeller 4c from spreading to the surroundings and guide it to the upper channel 5 above.

The lower duct 8 is a duct in which an inlet 8a is connected to the bottom of the mounting area a and an outlet 8b is connected to the lower end of the propeller duct 7. The lower duct 8 guides the cooling oil Y flowing along the object W to the propeller 4 c. The outlet 8b of the lower duct 8 is disposed vertically below the propeller 4c and opens upward. Further, the outlet 8b of the lower duct 8 is connected to the bottom of the placement area a from below.

The lower pipes 8 are provided in each oil sending device 4, and as shown in fig. 2, are provided in 4 places in total in the present embodiment. The outlets 8b of the lower ducts 8 are arranged so as to cover the entire area of the placement area a by 4.

The guide plate 9 is provided in advance at the bottom of the fork 3a, and includes a guide plate 9a and an attitude changing portion 9 b. The guide plate 9a is a flat plate-like member fixed to the end of the fork 3a by the attitude changing portion 9 b. The guide plate 9a guides the flow of the cooling oil Y from above to below the object W to the inlet 8a of the lower duct 8 so as to follow the object W.

The attitude changing section 9b is provided between the guide plate 9a and the yoke 3a, and is a member capable of changing the angle of the guide plate 9a with respect to the yoke 3a and fixing the guide plate 9 a. The posture changing unit 9b is driven based on a command from a control device not shown, and changes the posture of the guide plate 9a about the posture changing unit 9 b. The guide plate 9a can be changed in posture by the posture changing portion 9b from a state of being perpendicular to the fork 3a to a state of being opened outward by about 10 °.

As shown in fig. 2, the grid 10 is a grid-like member attached to the inlet 8a of the lower duct 8. The grid 10 prevents foreign matter from entering the lower duct 8 when the cooling oil Y flows from the upper portion to the lower portion of the object W.

In the cooling device R of the present embodiment, first, the heated object to be treated W is conveyed to the oil bath 1 by the object-to-be-treated lifting device 3 in a state of being placed on the fork 3 a. When the object W to be treated is immersed in the cooling oil Y in the oil bath 1, the upper duct 5 moved to the conveyance chamber 2 is lowered by the duct elevating device 6 and connected to the propeller duct 7. Further, at this time, the guide plate 9a is opened to the outside by about 10 ° from a state perpendicular to the yoke 3 a.

When the motor 4a is driven and the propeller 4c is rotationally driven at the start of cooling, a circulation flow X of the cooling oil Y is formed in the oil sump 1. The circulation flow X is formed by the cooling oil Y flowing in from the inlet 8a of the lower duct 8, passing through the oil sending device 4, passing through the propeller duct 7, and then flowing out through the outlet 5b of the upper duct 5. At this time, the cooling oil Y is guided to the guide plate 9a, and flows along the surface of the object W from the upper portion to the lower portion of the object W.

After a predetermined time (for example, 5 minutes) has elapsed from the start of cooling, the rotation direction of the motor 4a is changed by a command from a control device (not shown), and the rotation direction of the propeller 4c is changed to the reverse rotation. Further, the posture of the guide plate 9a is changed to a posture substantially perpendicular to the fork 3a by the posture changing portion 9 b. This generates a flow in the oil tank 1 in a direction opposite to the circulation flow X. That is, the cooling oil Y flows in from the outlet 5b of the upper duct 5, flows into the lower duct 8 via the propeller duct 7, and then flows out through the inlet 8a of the lower duct 8. That is, the oil sending device 4 sends the cooling oil on the lower side of the object W to the upper side. Thereby, the cooling oil Y is guided to the guide plate 9a and flows along the surface of the object W from the lower portion toward the upper portion of the object W.

When a predetermined time (for example, 5 minutes) has elapsed after the flow direction of the cooling oil Y is changed, the rotation direction of the motor 4a is changed again by a command from a control device (not shown) to change the rotation direction of the propeller 4c to the reverse rotation. Further, the posture of the guide plate 9a is changed from a state perpendicular to the fork 3a to a state opened outward by about 10 ° by the posture changing portion 9 b. This forms a circulating flow X of the cooling oil Y in the oil tank 1.

In this way, the flow direction is changed a plurality of times within a predetermined time from the start of cooling the object W to the completion of cooling.

When the object W is immersed in the cooling oil Y, the temperature of the upper portion tends to be higher than the temperature of the lower portion which is immersed first. In contrast, according to the present embodiment, the oil sending device 4 and the upper duct 5 can form a liquid flow from the upper portion to the lower portion of the object W to be treated at the start of cooling. This makes it possible to actively contact the cooling oil Y with the upper portion of the object W, and to eliminate the temperature distribution of the object W at the start of cooling. That is, the cooling device R of the present embodiment can uniformly cool the object W to be treated.

The circulating flow X is made to flow along the surface of the object W by the guide plate 9a that guides the cooling oil Y along the object W. This allows the object W to be in contact with the circulating flow X at all times, thereby efficiently cooling the object W.

In the present embodiment, the orientation of the guide plate 9a is changed to facilitate the guiding of the cooling oil Y to each pipe. That is, the posture changing unit 9b can change the posture of the guide plate 9a suitable for the object W depending on the state of the flow of the cooling oil Y or the shape of the object W.

After the start of cooling the object W for a predetermined time, the oil delivery device 4 changes the flow direction of the cooling oil Y so that the cooling oil Y flows in the reverse direction to the circulating flow. Thereby, the cooling oil Y flows from the lower portion to the upper portion of the object W, and the object W can be caused to pass through the cooling oil Y in both upper and lower directions. Therefore, the cooling device R can prevent the occurrence of temperature deviation in the object W to be treated, and can uniformly cool the object W to be treated.

Further, since the upper duct 5 is movable in the vertical direction by the duct elevating device 6, the upper duct 5 does not obstruct the conveyance of the object W to be processed.

Further, by providing the propeller duct 7, the cooling oil delivered by the oil delivery device 4 is guided to the upper side of the oil bath 1. Thus, a circulation flow X can be formed in the oil sump 1, facilitating control of the flow of the cooling oil Y in the oil sump 1.

[ 2 nd embodiment ]

Next, a modification of embodiment 1 will be described as embodiment 2 with reference to fig. 3. The same components as those in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted. Fig. 3 is a longitudinal sectional view schematically showing a cooling device R1 of the present embodiment.

The cooling device R1 of the present embodiment further includes a flow rectification plate portion 11, and the oil delivery device 4 includes a flow rectification plate 4 d.

The rectifying plate 4d is a plate member erected from the outer periphery of the motor 4 a. The flow straightening plate 4d is provided along the direction of the flow of the cooling oil Y in the propeller duct 7, thereby preventing the cooling oil Y flowing through the propeller duct 7 from being accumulated and straightening the cooling oil Y.

The fairing section 11 is provided in the propeller duct 7, and includes a shaft section 11a and a fairing 11 b. The shaft portion 11a is provided in the propeller duct 7 along the flow direction of the cooling oil Y. The rectifying plate 11b is a plate member erected in the radial direction from the shaft portion 11 a. The flow regulating plate 11b is provided along the flow direction of the cooling oil Y, thereby preventing the cooling oil Y flowing through the propeller passage 7 from being accumulated and regulating the flow of the cooling oil Y.

In the cooling device R1 of the present embodiment, the flow velocity of the cooling oil in the propeller duct 7 can be made uniform and the stagnation of the cooling oil Y can be prevented by providing the flow straightening plate 4d and the flow straightening plate 11b to the propeller duct 7. Therefore, the circulating flow X and the liquid flow in the reverse direction of the circulating flow X can be smoothly formed.

Further, by providing the flow straightening plate 4d and the flow straightening plate 11b with the propeller 4c interposed therebetween, even when the cooling oil Y flows in any direction, the flow straightening plate can be disposed on the downstream side of the propeller 4 c. Thereby, the cooling oil Y sent from the propeller 4c can be rectified by the rectifying

plates

4d and 11b in any flow direction.

The present disclosure is not limited to the above-described embodiments, and the following modifications are conceivable, for example.

(1) In the above embodiment, the upper duct 5, the oil sending device 4, the propeller duct 7, and the lower duct 8 are provided in 2 rows in the inward depth direction, but the present disclosure is not limited thereto, and 3 rows may be provided. In this case, the flow velocity of the cooling oil Y flowing through the upper duct 5, the propeller duct 7, and the lower duct 8 of the 3 rows can be changed by changing the rotational speed of each propeller 4 c.

(2) In the embodiment, the upper duct 5 is allowed to move in the up-down direction by the duct elevating device 6, but the present disclosure is not limited thereto. The upper duct 5 may be provided to move to each side (the left-right direction in fig. 1). Further, in the case where the upper duct 5 has a smaller diameter than the propeller duct 7, the upper duct 5 may be accommodated in the propeller duct 7.

(3) In the above embodiment, the cooling device R is configured to appropriately change the flow direction of the cooling oil Y in the oil tank 1, but the present disclosure is not limited thereto. The cooling device R may form only a liquid flow from the upper portion to the lower portion of the object W to be treated.

(4) The coolant is not limited to the coolant Y (oil), and another liquid (e.g., water) may be used as the coolant.

(5) In the above embodiment, the cooling oil Y is supplied to the upper portion of the object W by forming the circulating flow X by the cooling oil Y, but the present disclosure is not limited thereto.

For example, the cooling device R may include a tank for storing the cooling oil Y and an upper pipe 5, and the cooling oil Y stored in the tank may be supplied to the object W to be treated of the cooling oil Y immersed in the oil bath 1 through the upper pipe 5. In this case as well, the cooling oil Y can be supplied to the upper portion of the object W to be treated, and the object W can be uniformly cooled.

Industrial applicability

By applying the cooling device of the present disclosure to this field, the object to be treated can be uniformly cooled.

Description of the reference numerals

1 oil groove

2 conveying chamber

3 lifting device for processed object

3a fork

4 oil delivery device

4a motor

4b axle

4c propeller

4d fairing

5 upper pipe

5a inlet

5b outlet

6 pipeline lifting device

6a shaft

6b motor

6c pipe hanging part

7 propeller pipeline

8 lower part pipeline

8a inlet

8b outlet

9 guide plate part

9a guide plate

9b posture changing part

10 grid

11 flow rectification plate part

11a shaft part

11b fairing

20 liquid supply part

A carrying area

R cooling device

R1 cooling device

W object to be treated

X circulation flow

And Y cooling the oil.

Claims

1. A cooling apparatus for cooling an object to be treated by immersing the object in a cooling liquid from below,

the cooling device is provided with a liquid supply unit which supplies the cooling liquid to the upper part of the object to be processed at least when the object to be processed is cooled.

2. The cooling apparatus according to claim 1,

the liquid supply unit includes:

a liquid feeding device for feeding the coolant on the lower side of the object to be processed to the upper side;

and a duct provided above the object to be processed in the cooling liquid, for guiding the cooling liquid flowing in from the liquid feeding device to an upper portion of the object to be processed.

3. The cooling apparatus according to claim 2,

the liquid feeding device feeds the coolant on the upper side of the object to be processed downward after a predetermined time has elapsed from the start of cooling the object to be processed.

4. The cooling apparatus according to claim 2 or claim 3,

and a moving mechanism for moving the duct from outside the cooling liquid to above the object to be processed in the cooling liquid.

5. The cooling apparatus according to any one of claims 2 to 4,

the cooling system is provided with a liquid conveying device pipeline which is connected with the pipeline and extends in the vertical direction in the cooling liquid, and the liquid conveying device is arranged in the liquid conveying device pipeline.

6. The cooling apparatus according to claim 5,

the liquid cooling device is provided with a rectifying plate which is arranged on the liquid feeding device pipeline and rectifies the cooling liquid.

7. The cooling apparatus according to any one of claims 1 to 6,

the cooling device is provided with a guide plate which is arranged on the side of the object to be treated and guides the cooling liquid to flow along the object to be treated.

8. The cooling apparatus according to claim 7,

the device is provided with a posture changing part for changing the posture of the guide plate.