JP7389679B2 - Stirring shaft and heat exchange device equipped with it - Google Patents

Description

The present invention relates to a stirring shaft having stirring blades and a heat exchange device equipped with the same.

Conventionally, a stirring shaft has been known that has a stirring blade on the outer periphery of a cylindrical rotating shaft of a screw shaft, and stirs the object to be processed while heating the object by circulating a heat medium through the screw shaft. . In this type of stirring shaft, unless a heat medium is allowed to flow not only in the center but also in the stirring blade, it takes time for the tip of the stirring blade to be heated to an appropriate temperature. For this reason, since the stirring blade cannot be considered as a heat transfer area, the heat exchange efficiency of the heat exchange device becomes low.

Therefore, as in Patent Document 1, as a heat medium flow path, there is a shaft-side flow path that extends linearly in the axial direction from the center of the rotating shaft, and a connection path that extends in the radial direction to this shaft-side flow path. , and a blade-side flow path extending along a spiral blade are known.

Japanese Patent Application Publication No. 2015-172471

However, as in Patent Document 1, it is not easy to manufacture a screw shaft so as to form a spirally continuous flow path inside an integrally formed stirring blade.

The present invention has been made in view of the above points, and its purpose is to improve the heat exchange efficiency by reliably circulating a heat medium to the tip of the stirring blade with a relatively simple configuration. .

In order to achieve the above object, the first invention targets a stirring shaft in which a heat medium flow path for circulating a heat medium is formed and stirring blades are provided on the outer periphery,
The above stirring shaft is
a cylindrical shaft;
a central flow path passing through the axis of the cylindrical shaft;
a plurality of stirring blades extending radially outward from the outer periphery of the cylindrical shaft portion and spaced apart from each other in the axial direction;
a blade-side channel provided in the stirring blade, one end of which communicates with the central channel, and the other end of which passes through the interior of the stirring blade and communicates with the central channel;
The central flow path is inserted into the center flow path, has a heat medium supply/discharge path at its axis, one end communicating with the center flow path, and a heat medium being supplied or discharged from the other end; and a tubular partition member that partitions an upstream side and a downstream side at a position corresponding to the blade, and communicates the upstream side with one end of the blade side flow path and the downstream side with the other end of the blade side flow path. There is.

According to the above configuration, the partition member is provided in the central flow path passing through the axis to ensure an internal flow path (feed flow path or return flow path), and partition the central flow path to create a flow path on the blade side of the stirring blade. Since the heating medium is configured to flow through the stirring blade, the heating medium can be forced to flow even to the tips of the stirring blades, and the heating medium can flow reliably and efficiently.

In the second invention, in the first invention,
The partition member has an outer diameter smaller than the inner diameter of the central flow path to such an extent that it can be inserted into the central flow path, and in a portion corresponding to the stirring blade, the blade-side flow path is connected to the central flow path. A rib portion is provided between the inner circumferential surface and the outer circumferential surface of the partition member to partition into an upstream side and a downstream side.

According to the above configuration, by inserting the partition member with the rib portion into the central flow path, the heat medium always passes through the blade side flow path, and the heat medium is reliably passed through the blade side flow path of the stirring blade. It can be distributed.

In the third invention, in the second invention,
The rib portion is formed of a circumferentially continuous protrusion provided at a portion of the outer periphery of the partition member corresponding to the stirring blade so as to be inclined with respect to the axial direction.

According to the above configuration, the rib portion can be easily formed at an appropriate position on the partition member.

In a fourth invention, in any one of the first to third inventions,
At least a portion of the blade-side flow path is constituted by a drilled hole machined into the stirring blade.

According to the above configuration, the blade-side flow path can be formed in the stirring blade relatively easily and reliably by using the drill hole processing.

In the fifth invention, in the fourth invention,
The agitating blade has a distal end portion in which a connecting surface that is connected to a connecting surface from which the pair of through holes are exposed is formed with a groove that communicates the pair of through holes.

According to the above configuration, when a pair of through holes are provided to form a flow path on the blade side, it is necessary to close the through holes. By forming in advance a groove that communicates with the pair of exposed through holes, the blade side flow path can be formed while blocking the through holes, so that the stirring blade can be manufactured by a relatively simple method.

In a sixth invention, in any one of the first to fifth inventions,
A swivel that is connected to the stirring shaft and supplies a heat medium to one of the central flow path and the heat medium supply/discharge path, and recovers the heat medium returned from the other of the central flow path and the heat medium supply/discharge path. joint and
a casing that rotatably supports the stirring shaft;
a heat medium circulation device that supplies and recovers the heat medium via the swivel joint;
The partition member is connected to the inner tube of the swivel joint, and is provided to rotate integrally with the stirring shaft.

According to the above configuration, since the partition member rotates together with the stirring shaft, the positional relationship with the partition member does not change even if the stirring shaft rotates, so that the heat medium can be circulated to the tip of the stirring blade. Therefore, a highly marketable heat exchange device with a high heat exchange rate can be obtained.

As described above, according to the present invention, the heat exchange rate can be improved by reliably circulating the heat medium to the tip of the stirring blade with a relatively simple configuration.

FIG. 2 is a sectional view showing a stirring shaft according to an embodiment of the present invention. 1 is a cross-sectional view schematically showing a kneader having a stirring shaft according to an embodiment of the present invention. 3 is an enlarged sectional view taken along the line III-III in FIG. 2. FIG. FIG. 2 is an enlarged cross-sectional view showing a stirring blade and its surroundings. FIG. 3 is an enlarged sectional view of the V section in FIG. 2;

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows a kneading machine 10 as a heat exchange device according to the present invention. This kneading machine 10 has, for example, a closed box-shaped casing 1, and a material to be processed (raw material) A This is a continuous kneading machine which is provided with a supply port 2 and a discharge port 3 at the lower end of the other end. Further, a jacket 4 is formed around the outer periphery of the casing 1, and a heat medium C can be circulated therethrough by a known heat medium circulation device 20.

As shown in an enlarged view in FIG. 3, for example, a pair of stirring shafts 50 are supported in the casing 1 so as to be rotatable by a motor (not shown). For example, one end of the swivel joint 14 is pivotally supported by a bearing 17 and connected to the motor, and the other end is pivotally supported by the bearing 17 and supplies and recovers the heat medium C from the heat medium circulation device 20. is connected. For example, one reverse feed screw paddle 16 is fitted onto the end of the stirring shaft 50 on the swivel joint 14 side.

A plurality of progressive screw paddles 18 are fitted onto the motor side of the stirring shaft 50 . The shape of this progressive screw paddle 18 is not particularly limited. The reverse screw paddle 16 may be the same as the forward screw paddle 18 attached in the opposite direction.

As shown in FIGS. 1 and 3, the stirring shaft 50 has a heat medium flow path formed inside thereof through which the heat medium C from the heat medium circulation device 20 flows, and a heat medium flow path for stirring the object A to be processed on the outer periphery. A stirring blade 53 is provided. The heat medium flow path includes a center flow path 52, a blade side flow path 54, and a heat medium supply/discharge path 55b, which will be described later.

Specifically, as shown in FIG. 1, the stirring shaft 50 includes a cylindrical shaft portion 51 and a central flow path 52 passing through the axis of the cylindrical shaft portion 51. As shown in FIG. 3, a plurality of stirring blades 53 are provided at the longitudinal center portion of the cylindrical shaft portion 51, extending radially outward from the outer periphery of the cylindrical shaft portion 51 and spaced apart from each other in the axial direction. is formed protrudingly. The stirring blade 53 is formed with a blade-side flow path 54 whose one end communicates with the central flow path 52 and which passes through the stirring blade 53 and communicates with the central flow path 52 at the other end.

As shown enlarged in FIGS. 3 and 4, the stirring blade 53 has, for example, an equilateral triangular shape with diagonally chamfered corners when viewed from the axial direction, and a scraper 53a is fastened or attached to the chamfered portion. Welded. The blade side flow path 54 is formed in a hexagonal shape inside thereof. The scraper 53a of the stirring blade 53 rotates close to the inner circumferential surface of the casing 1 and the outer circumferential surface of the stirring blade 53 of the other stirring means to scrape off deposits attached to the inner circumferential surface and the outer circumferential surface. It is configured so that it can be done.

For example, as shown in an enlarged view in FIG. 4, the blade-side flow path 54 includes a plurality of drill holes 54a and 54b machined into a hexagonal portion 53b that integrally projects from the cylindrical shaft portion 51, and has a triangular shape. A linear groove 54c is formed in advance by an end mill or the like on the connecting surface 53e of the triangular tip 53c, which is welded so as to close the pair of drilled holes 54b exposed on the connected surface 53d of the chamfered corner. It is constituted by communicating with each of these pair of drill holes 54b. In this way, the blade-side flow path 54 can be formed in the stirring blade 53 relatively easily by drilling, grooving, and welding.

As shown in FIGS. 1 and 5, a hollow shaft-shaped (tubular) partition member 55 is inserted into the central flow path 52. As shown in FIGS. The partition member 55 is connected to the inner tube 19 of the swivel joint 14 by welding, for example, and is supported so as to rotate integrally with the stirring shaft 50. The partition member 55 has a heat medium supply/discharge path 55b at its axis that communicates with the inside of the inner tube 19, one end of which is connected to the swivel joint 14 to be supplied with the heat medium C, and the other end is open. It is configured to discharge the heat medium C. The partition member 55 is inserted into the central flow path 52 and partitions the central flow path 52 into an upstream side and a downstream side at a position corresponding to the stirring blade 53, and has a perforated hole 54a forming the blade side flow path 54 on the upstream side. It has the role of communicating with one end 54d and communicating the downstream side with the other end 54e of the drilled hole 54a forming the blade side flow path 54.

Specifically, as shown in an enlarged view in FIG. A rib portion 55a is provided between the inner circumferential surface of the flow path 52 and the outer circumferential surface of the partition member 55 to partition into an upstream side and a downstream side. The rib portion 55a is a protrusion continuous in the circumferential direction that is provided at a portion of the outer periphery of the partition member 55 corresponding to the stirring blade 53 so as to be inclined with respect to the axial direction. For example, in order to allow the partition member 55 to be inserted into the central flow path 52, it is preferable to ensure a clearance of about 0.5 mm to 1 mm between the rib portion 55a and the inner circumferential surface of the central flow path 52, for example. The rib portion 55a can be easily formed at an appropriate position by cutting from a round pipe or by welding a plate member at an appropriate position.

Next, the operation of the stirring shaft 50 according to this embodiment will be explained.

When the raw material A is supplied into the casing 1 from the supply port 2, the raw material A is sent toward the discharge port 3 side by the feeding action of the progressive screw paddle 18, and is heated by being kneaded by the rotation of the stirring blade 53. After being thoroughly kneaded while stirring, the product is discharged from the discharge port 3 as a product (kneaded material) B. At this time, the amount of raw material A supplied is adjusted to adjust the degree of heating. Note that the heat medium C may be used not only for heating but also for cooling.

During this time, the heat medium C is circulated into the jacket 4 of the casing 1 through an inlet/outlet (not shown) to heat or cool the raw material A. Further, as shown in FIG. 5, the heat medium C is also supplied from the swivel joint 14 through the inner tube 19 to the heat medium supply/discharge path 55b, and is passed from deep inside the central flow path 52 through the outer periphery of the partition member 55. The heat medium returns to the swivel joint 14 again and is returned to the heat medium circulation device 20.

At this time, the partition member 55 is inserted into the central flow path 52 so as to rotate integrally with the stirring shaft 50, and the rib portion 55a is arranged at the same position inside the blade side flow path 54 in the radial direction. As shown in an enlarged view, the heat medium C flowing along the outer periphery of the partition member 55 from deep inside the central channel 52 is guided by the rib portion 55a and flows into one end 54d of the blade-side channel 54. It passes through the drill hole 54a, the groove 54c, and the drill hole 54b to reach the other end 54e. Then, it is guided downstream again by the rib portion 55a and proceeds along the outer periphery of the partition member 55 toward the next rib portion 55a.

By forcing the heat medium C to flow also into the blade-side channel 54 in this way, not only the outer periphery of the cylindrical shaft portion 51 but also the surface of the stirring blade 53 becomes a heat transfer surface, which is effective. Heat is transferred to.

In this embodiment, the partition member 55 is provided in the central flow path 52 passing through the axis to secure the heat medium supply/discharge path 55b (feed flow path), and partition the central flow path 52 to the blade side of the stirring blade 53. Since the heat medium C is configured to flow through the flow path 54, the heat medium C can be forced to flow even to the tip of the stirring blade 53, and the heat medium C can efficiently flow.

Therefore, according to the stirring shaft 50 according to the present embodiment, the heat medium C can be reliably circulated to the tip of the stirring blade 53 with a relatively simple configuration, and the heat exchange rate can be improved. Thereby, a kneading machine 10 with a high heat exchange rate and high marketability can be obtained.

(Other embodiments)
The present invention may have the following configuration for the above embodiment.

That is, in the above embodiment, two stirring shafts 50 are arranged in parallel in the kneading machine 10, but only one stirring shaft 50 may be used.

In the above embodiment, the heat medium C supplied from the swivel joint 14 into the partition member 55 is supplied into the central flow path 52 through the heat medium supply/discharge path 55b. Even if the heat medium C that flows along the outer periphery of the partition member 55 through the blade side flow path 54 to the motor side is discharged to the swivel joint 14 side through the heat medium supply/discharge path 55b of the partition member 55. good.

In the above embodiment, the stirring blade 53 has a triangular shape in side view and has a scraper 53a at its tip, but the shape is not particularly limited and may be a triangular rice ball shape or the like.

Note that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications, or uses.

1 Casing
2 Supply port
3 Outlet
4 Jacket
10 Kneader (heat exchange device)
14 Swivel joint
16 Screw paddle for reverse feed
17 Bearing
18 Screw paddle for progressive feeding
19 Inner tube
20 Heat medium circulation device
50 Stirring shaft
51 Cylindrical shaft part
52 Central channel
53 Stirring blade
53a scraper
53b Hexagonal part
53c Tip
53d Connected surface
53e Connecting surface
54 Vane side flow path
54a, 54b drill hole
54c Groove
54d one end
54e Other end
55 Partition member
55a Rib part
55b Heat medium supply/discharge path
A Raw material
B Product
C heat medium

Claims (6)

A stirring shaft in which a heat medium flow path for circulating a heat medium is formed, and a stirring blade is provided on the outer periphery,
a cylindrical shaft;
a central flow path passing through the axis of the cylindrical shaft;
a plurality of stirring blades extending radially outward from the outer periphery of the cylindrical shaft portion and spaced apart from each other in the axial direction;
a blade-side flow path provided in the stirring blade, one end communicating with the central flow path, and the other end communicating with the central flow path through the inside of the stirring blade;
The heating medium supply/discharge path is inserted into the central flow path, one end communicates with the central flow path, and the heat medium is supplied or discharged from the other end. a tubular partition member that partitions into an upstream side and a downstream side at a position corresponding to the blade, and communicates the upstream side with one end of the blade side flow path and the downstream side with the other end of the blade side flow path,
On the outer periphery of a portion of the partition member that corresponds to the inside of the stirring blade, the blade-side flow path is formed between the inner peripheral surface of the central flow path and the outer peripheral surface of the partition member, on the upstream side and the downstream side. An annular rib portion (55a) is formed when viewed from the axial direction of the partition member.
A stirring shaft characterized by: The stirring shaft according to claim 1,
The rib portion has an outer diameter smaller than the inner diameter of the central flow path to such an extent that it can be inserted into the central flow path.
A stirring shaft characterized by: The stirring shaft according to claim 2,
The above-mentioned rib part is characterized in that it consists of a protrusion that is continuous in the circumferential direction and is provided at a portion of the outer periphery of the partition member corresponding to the above-mentioned stirring blade so as to be inclined with respect to the axial direction. shaft. The stirring shaft according to any one of claims 1 to 3,
A stirring shaft characterized in that at least a part of the blade-side flow path is constituted by a drilled hole machined in the stirring blade. The stirring shaft according to claim 4,
The agitation shaft is characterized in that the agitation blade has a distal end portion in which a groove is formed in a connection surface that is connected to a connected surface from which the pair of throughholes are exposed, and a groove that communicates the pair of throughholes. The stirring shaft according to any one of claims 1 to 5,
A swivel that is connected to the stirring shaft and supplies a heat medium to one of the central flow path and the heat medium supply/discharge path, and recovers the heat medium returned from the other of the central flow path and the heat medium supply/discharge path. joint and
a casing that rotatably supports the stirring shaft;
a heat medium circulation device that supplies and recovers the heat medium via the swivel joint;
The heat exchanger is characterized in that the partition member is connected to the inner tube of the swivel joint and is provided to rotate integrally with the stirring shaft.

Images