JP2016017190A - Cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device where the object to be treated is immersed into a coolant, thus is cooled, in which the object to be treated is uniformly cooled and the further improvement of the quality of the object to be treated.SOLUTION: Provided is a cooling device comprising: a liquid tank storing a coolant and further provided with the mounting region of the object to be treated at the inside; a propeller arranged at the inside of the liquid tank and further pressure-feeding the coolant; and a duct of guiding the coolant from the propeller to the lower part of the mounting region, and further comprising a guide plate provided at the inside of the duct and guiding the coolant flowing the inside of the duct toward the corner parts of the bottom part in the mounting region.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooling device.

  Conventionally, a heat treatment furnace such as a vacuum carburizing furnace has been provided with a cooling device for immersing and cooling a heat-treated object in a cooling liquid such as oil. For example, as shown in Patent Document 1, the cooling device includes a propeller for stirring the cooling liquid inside the liquid tank and a duct for guiding the flow of the cooling liquid from the propeller to the object to be processed. In such a cooling device, the flow formed by the rotation of the propeller is guided by the duct, so that the convection passing through the workpiece is formed inside the liquid tank, thereby improving the cooling performance. .

JP 2013-227595 A

  In order to further improve the quality of the workpiece, it is desirable that the workpiece is cooled uniformly. However, in the cooling device of Patent Document 1, the flow of the coolant is biased, and the flow tends to stay in the corners of the region where the workpiece is placed. For this reason, the flow velocity at the corner of the region where the workpiece is placed is lowered, and the workpiece cannot be sufficiently cooled uniformly.

  The present invention has been made in view of the above-described problems, and in a cooling device that cools an object to be processed by being immersed in a cooling liquid, the object to be processed is cooled more uniformly, and further quality of the object to be processed is obtained. The purpose is to improve.

  The present invention adopts the following configuration as means for solving the above-described problems.

  According to a first aspect of the present invention, there is provided a liquid tank that stores a cooling liquid and has a placement area for an object to be processed therein, a propeller that is disposed inside the liquid tank and that pumps the cooling liquid, and the propeller A cooling device including a duct for guiding the cooling liquid to a position below the placement area, which is provided inside the duct and flows inside the duct toward a corner of a bottom portion of the placement area. A configuration is adopted in which a guide plate for guiding the coolant is provided.

  A second invention is a cooling device for a heat treatment furnace, in which a coolant is stored and a placement area for an object to be processed is provided inside, and the liquid tank is disposed inside the liquid tank and A configuration is adopted that includes a propeller that pumps the cooling liquid, a duct that guides the cooling liquid from the propeller to a position below the placement area, and a guide plate that is provided inside the duct and guides the cooling liquid. .

  According to a third invention, in the first or second invention, the propeller is disposed on a side of the placement area and pumps the cooling liquid downward, and the duct is connected to the propeller. An inlet opening downward and an outlet connected to the bottom of the placement area from below; the guide plate is erected inside the duct; A configuration is adopted in which the downstream end portion is inclined with respect to the center line of the duct so that the downstream end portion is positioned closer to the corner side of the placement region than the upstream end portion.

  According to a fourth aspect, in the third aspect, the upstream end of the guide plate is provided at a position displaced from directly below the propeller.

  According to a fifth invention, in any one of the first to fourth inventions, a shaft that is vertically arranged and to which the propeller is fixed is provided, and a plurality of the propellers arranged vertically are provided on the shaft. It adopts the configuration that is.

  A sixth invention adopts a configuration in which the propeller and the duct are provided on both sides of the placement area in plan view in any of the first to fifth inventions.

  According to the present invention, the cooling liquid pumped by the rotation of the propeller is guided by the guide plate to the bottom corner of the placement area, which is the area where the workpiece is placed. That is, according to the present invention, the flow of the coolant formed by the propeller is guided to the corner at the bottom of the placement region by the guide plate. For this reason, according to the present invention, in the cooling device that prevents the corner of the bottom portion of the mounting region from becoming a staying place of the coolant and cools the workpiece by being immersed in the coolant, It becomes possible to further uniformly improve the quality of the object to be processed by cooling the object more uniformly.

It is a longitudinal section showing a schematic structure of a cooling device of one embodiment of the present invention typically. It is AA sectional drawing of FIG.

  Hereinafter, an embodiment of a cooling device according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

  FIG. 1 is a longitudinal sectional view schematically showing a schematic configuration of the cooling device 1 of the present embodiment. FIG. 2 is a cross-sectional view taken along the line AA in FIG. The cooling device 1 of this embodiment is installed in, for example, a two-chamber vacuum carburizing furnace, and cools the heated workpiece W. As shown in FIG. 1, the cooling device 1 includes an oil tank 2 (liquid tank), a transfer chamber 3, an elevating device 4, a stirrer 5, a propeller duct 6, and a rectifying duct 7 (the duct of the present invention). Equivalent), a guide plate 8, and a grating 9.

  The oil tank 2 is a tank that stores the cooling oil Y and has a capacity capable of accommodating the workpiece W to be cooled. The workpiece W is cooled by being immersed in the cooling oil Y in the oil tank 2. Hereinafter, in the oil tank 2, an area where the workpiece W can be arranged during cooling is referred to as a placement area R. In addition, since the shape of the to-be-processed object W is various, the actual shape of the to-be-processed object W and the mounting area | region R do not necessarily correspond.

  The transfer chamber 3 is provided above the oil tank 2. The transfer chamber 3 is a room in which the workpiece W to be taken in and out of the oil tank 2 is temporarily detained. The transfer chamber 3 is connected to a heating chamber (not shown), for example, and functions as a chamber for delivering the workpiece W to the heating chamber. That is, in the transfer chamber 3, the workpiece W to be taken in and out of the oil tank 2 and a heating chamber (not shown) is transferred.

  The elevating device 4 includes a fork 4a on which the workpiece W is placed, and the fork 4a is moved up and down by a drive mechanism (not shown) so that the workpiece W is moved between the oil tank 2 and the transfer chamber 3. Transport. In addition, the to-be-processed object W is immersed in the cooling oil stored in the oil tank 2 with the state mounted in the fork 4a, and is cooled in the oil tank 2 with the state mounted in the fork 4a. In FIG. 1, only the fork 4 a of the lifting device 4 is illustrated, and other components are omitted.

  As shown in FIG. 2, two stirrers 5 are provided on each of one side and the other side of the placement region R, and four stirrers 5 are provided in the present embodiment. As shown in FIG. 1, each stirrer 5 includes a motor 5a, a shaft 5b, a bearing portion 5c, a first propeller 5d, and a second propeller 5e.

  The motor 5 a is fixed to the ceiling 2 a of the oil tank 2 and is disposed outside the oil tank 2. The motor 5a generates power for rotating the first propeller 5d and the second propeller 5e. The shaft 5 b is vertically arranged by being connected to the motor 5 a at the upper end and penetrating through the ceiling portion 2 a of the oil tank 2 to the inside of the oil tank 2. The lower end side of the shaft 5b is disposed below the liquid level of the cooling oil Y stored in the oil tank 2, and a first propeller 5d and a second propeller 5e are provided. The bearing part 5c is provided in the site | part through which the shaft 5b of the ceiling part 2a of the oil tank 2 penetrates, and supports the shaft 5b rotatably.

  The first propeller 5d and the second propeller 5e are propellers of the same shape provided on the shaft 5b, and are arranged so that the first propeller 5d is on the upper side and the second propeller 5e is on the lower side (the tip of the shaft 5b). Yes. The first propeller 5d and the second propeller 5e are disposed below the level of the cooling oil Y stored in the oil tank 2 and on the side of the placement region R, and are rotated together with the shaft 5b. The cooling oil Y is pumped downward. Moreover, as shown in FIG. 2, in this embodiment, in all four stirrers 5, the first propeller 5d and the second propeller 5e are rotated in the same direction.

  The propeller duct 6 is a cylindrical duct that surrounds the first propeller 5 d and the second propeller 5 e of the stirrer 5, and has an upper end that is an open end and a lower end that is connected to the rectifying duct 7. The propeller duct 6 is provided for each stirrer 5, and as shown in FIG. 2, a total of four propeller ducts 6 are provided in the present embodiment. These propeller ducts 6 prevent the flow generated by the rotation of the first propeller 5d and the second propeller 5e from diffusing to the surroundings, and guide the flow to the rectifying duct 7 below.

  The rectifying duct 7 is a duct in which the inlet 7 a is connected to the lower end of the propeller duct 6 and the outlet 7 b is connected to the bottom of the placement region R. The rectifying duct 7 guides the cooling oil Y pumped by the first propeller 5d and the second propeller 5e from the first propeller 5d and the second propeller 5e to below the placement region R. The inlet 7a of the rectifying duct 7 is arranged below the first propeller 5d and the second propeller 5e in the vertical direction, and is opened upward. The outlet 7b of the rectifying duct 7 is connected to the bottom of the placement region R from below.

  The rectifying duct 7 is provided for each stirrer 5 and, as shown in FIG. 2, a total of four rectifying ducts 7 are provided in the present embodiment. As shown in FIG. 2, four outlets 7 b of the respective rectifying ducts 7 are arranged in a rectangular shape as a whole so as to cover the entire placement region R.

  The guide plate 8 guides the cooling oil Y flowing inside the rectifying duct 7 toward a region where the cooling oil Y stays when the guide plate 8 is not installed. In the present embodiment, as shown in FIG. 2, staying occurs at the two corners R1 of the placement region R. That is, among the four stirrers 5, the one located at the lower left in FIG. 2 is located at the first stirrer 5A, the one located at the upper left in FIG. 2 is located at the second agitator 5B, and the lower right in FIG. If the thing is the third stirrer 5C and the one located at the upper right in FIG. 2 is the fourth stirrer 5D, cooling is performed at the corner R1 close to the second stirrer 5B and the corner R1 close to the third stirrer 5C. Oil Y stagnates. For this reason, in this embodiment, the guide plate 8 is installed in the inside of the rectification duct 7 provided with respect to the 2nd stirrer 5B, and the inside of the rectification duct 7 provided with respect to the 3rd stirrer 5C. Has been.

  As shown in FIG. 1, the guide plate 8 is a flat plate-like member installed upright inside the rectifying duct 7. The upstream end portion 8a of the guide plate 8 is provided at a position displaced toward the outlet 7b side of the rectifying duct 7 so as to avoid the vertical direction (that is, directly below) the first propeller 5d and the second propeller 5e. Yes. Further, as shown in FIG. 2, the guide plate 8 has the downstream end portion 8b positioned closer to the corner R1 of the placement region R than the upstream end portion 8a in plan view, as shown in FIG. As shown, the rectifying duct 7 is provided so as to be inclined with respect to the center line L.

  The fact that the cooling oil Y stays in the corner R1 is considered that the flow of the cooling oil Y is uneven in the rectifying duct 7 and the flow rate of the cooling oil Y flowing in the direction of the corner R1 is reduced. . At this time, according to the cooling device 1 of the present embodiment, the guide plate 8 cools the corner R1 from the region opposite to the corner R1 of the rectifying duct 7 which is considered to have a relatively large flow rate. The oil Y can be guided, and the flow rate of the cooling oil Y supplied to the corner portion R1 can be increased. Therefore, the retention of the cooling oil Y in the corner portion R1 can be eliminated.

  The stagnation of the cooling oil Y is likely to occur at the bottom corner of the placement region R, but the stagnation does not necessarily occur at all corners. For this reason, it is not necessary to guide the cooling oil Y to the corner where the cooling oil Y does not stay by the guide plate 8. Since in which corner the stagnation changes depends on the placement region R, the shape of the oil tank 2, and the like, verification by experiment or simulation is performed in advance.

  The grating 9 is attached to the outlet 7 b of the rectifying duct 7 and prevents foreign matter from entering the rectifying duct 7. This grating 9 is provided for each rectifying duct 7, and a total of four are provided in this embodiment.

  In the cooling device 1 of this embodiment, when the motor 5a is driven and the first propeller 5d and the second propeller 5e are rotationally driven, a circulating flow X of the cooling oil Y is formed in the oil tank 2, The workpiece W placed on the placement region R is cooled.

  Here, in the cooling device 1 according to the present embodiment, the cooling oil Y pumped by the rotation of the first propeller 5d and the second propeller 5e is guided by the guide plate 8 at the bottom corner of the placement region R. Guided to R1. That is, according to the cooling device 1 of the present embodiment, the flow of the cooling oil Y formed by the first propeller 5d and the second propeller 5e is directed toward the corner R1 at the bottom of the placement region R by the guide plate 8. Guided. For this reason, it is possible to prevent the bottom corner R1 of the placement region R from becoming a staying place of the cooling oil Y, cool the workpiece W more uniformly, and further improve the quality of the workpiece W. Is possible.

  Further, in the cooling device 1 of the present embodiment, the guide plate 8 is erected inside the rectifying duct 7, and the downstream end portion 8 b is higher than the upstream end portion 8 a in the plan view in the placement region R. It is inclined with respect to the center line L of the rectifying duct so as to be positioned on the corner R1 side. For this reason, the cooling oil Y can be easily guided to the corner R1 of the placement region R by the guide plate 8 having a simple shape.

  Further, in the cooling device 1 of the present embodiment, the upstream end portion 8a of the guide plate 8 is provided at a position displaced from directly below the first propeller 5d and the second propeller 5e. Therefore, in the vicinity of the first propeller 5d and the second propeller 5e in the turbulent state, the turbulent flow and the guide plate 8 are prevented from interfering with each other, and the cavitation caused by the turbulent flow and the guiding plate 8 interfering with each other. Can be prevented. Therefore, the rotational speed of the first propeller 5d and the second propeller 5e can be increased to increase the flow velocity, and the workpiece W can be cooled in a shorter time.

  In the cooling device 1 of the present embodiment, two (a plurality of) propellers (first propeller 5d and second propeller 5e) are provided for one shaft 5b. That is, in one stirrer 5, the propeller is vertically divided into two stages. As a result, the flow velocity inside each rectifying duct 7 can be increased, and the flow velocity of the cooling oil Y discharged from the outlet 7b can be increased. As a result, it is possible to suppress mixing of the flows of the cooling oil Y discharged from the different outlets 7b. When the flows of the cooling oil Y discharged from the different outlets 7b are mixed with each other, an interference flow having a non-uniform flow rate is formed, and the workpiece W is not uniformly cooled. According to the cooling device 1 of the present embodiment, since the flows of the cooling oil Y discharged from the different outlets 7b can be suppressed from being mixed as described above, the workpiece W is cooled more uniformly. It becomes possible.

  Moreover, in the cooling device 1 of this embodiment, the propeller (the 1st propeller 5d and the 2nd propeller 5e) and the rectification | straightening duct 7 are provided in the both sides of the mounting area | region R by planar view. For this reason, the flow velocity on both sides of the placement region R placed on the workpiece W can be equalized, and the workpiece W can be cooled more uniformly.

  Moreover, in the cooling device 1 of this embodiment, all the propellers (the first propeller 5d and the second propeller 5e) are rotated in the same direction. For this reason, the turning direction of the flow discharged from the outlet 7b of each rectifying duct 7 is the same direction. When discharged from the outlet 7b of each rectifying duct 7, the swirl component of the flow is not large. However, when the swirl directions are the same, turbulent flow is difficult to form when the flows interfere with each other, and each flow Can be prevented from mixing. Therefore, the generation of the interference flow described above can be suppressed, and the workpiece W can be cooled more uniformly.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the configuration in which the guide plate 8 is installed for the two rectifying ducts 7 out of the four rectifying ducts 7 has been described. However, the present invention is not limited to this, and if the number of corners R1 of the mounting region R where the cooling oil Y stays changes, the number of installed guide plates 8 changes accordingly. .

  Moreover, in the said embodiment, the horizontal plate 10 orthogonal to the guide plate 8 may be installed, and the inside of the rectifying duct 7 may be divided into four by the guide plate 8 and the horizontal plate 10. In such a case, the inside of the rectifying duct 7 is more finely divided, and the flow of the cooling oil Y discharged from the outlet 7b can be made more uniform.

  Moreover, in the said embodiment, the structure which installs the stirrer 5 2 each on both sides of the mounting area | region R was employ | adopted. However, the present invention is not limited to this, and one stirrer 5 may be installed on each side of the placement region R.

  Moreover, in the said embodiment, the structure which uses the cooling oil Y as a cooling fluid was demonstrated. However, the present invention is not limited to this, and a configuration using another liquid (for example, water) as the cooling liquid may be employed.

  In the above embodiment, the propeller duct 6 provided for the first stirrer 5A and the propeller duct 6 provided for the second stirrer 5B may be integrated. Further, the propeller duct 6 provided for the third stirrer 5C and the propeller duct 6 provided for the fourth stirrer 5D may be integrated.

  DESCRIPTION OF SYMBOLS 1 ... Cooling device, 2 ... Oil tank (liquid tank), 2a ... Ceiling part, 3 ... Transfer chamber, 4 ... Lifting device, 4a ... Fork, 5 ... Stirrer, 5A ... First stirring Machine, 5B ... second stirrer, 5C ... third stirrer, 5D ... fourth stirrer, 5a ... motor, 5b ... shaft, 5c ... bearing part, 5d ... first propeller (propeller ), 5e: 2nd propeller (propeller), 6: Propeller duct, 7: Rectification duct (duct), 7a: Inlet, 7b: Outlet, 8: Guide plate, 8a: Upstream end 8b: downstream end, 9: grating, 10: horizontal plate, L: center line, R: placement area, R1: corner, W: workpiece, X: circulation Flow, Y ... Cooling oil (coolant)

Claims (6)

A liquid tank that stores the cooling liquid and has a placement area for the object to be processed therein, a propeller that is disposed inside the liquid tank and that pumps the cooling liquid, and the above-described placement area from the propeller A cooling device comprising a duct for guiding the coolant to the lower side,
A cooling device comprising a guide plate provided inside the duct and for guiding the coolant flowing in the duct toward the corner of the bottom of the placement area. A liquid tank in which a cooling liquid is stored and a placement area for an object to be processed is provided;
A propeller disposed inside the liquid tank and pumping the cooling liquid;
A duct for guiding the coolant from the propeller to a position below the placement area;
A cooling device for a heat treatment furnace, comprising: a guide plate provided inside the duct for guiding the coolant. The propeller is arranged on the side of the placement area and pumps the coolant downward.
The duct has an inlet disposed below the propeller and opened upward, and an outlet connected to the bottom of the placement area from below.
The guide plate is erected inside the duct, and the center of the duct is arranged such that the downstream end is positioned closer to the corner of the placement area than the upstream end in plan view. The cooling device according to claim 1, wherein the cooling device is provided to be inclined with respect to the line.   The cooling device according to claim 3, wherein the upstream end portion of the guide plate is provided at a position displaced from directly below the propeller.   5. The shaft according to claim 1, further comprising a shaft that is vertically arranged and to which the propeller is fixed, and the plurality of propellers arranged vertically are provided with respect to the shaft. The cooling device as described.   The cooling device according to any one of claims 1 to 5, wherein the propeller and the duct are provided on both sides of the placement region in plan view.

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