JP6205378B2 - Manufacturing method of screw shaft having spiral blades and heat exchange device including the same - Google Patents

Description

  The present invention relates to a method for manufacturing a screw shaft having spiral blades and a heat exchange apparatus including the same.

  Conventionally, a pair of screw shafts are installed in parallel in the casing, and the pair of screw shafts are rotated in opposite directions to mesh with the spiral blades provided on the outer periphery, and powder, liquid (slurry, including viscous fluid) A kneader for kneading materials to be kneaded such as) is known.

  Among such kneaders, a heat exchange device is known in which a heat medium flow path through which a heat medium flows is provided inside a screw shaft to knead the material to be kneaded while heating or cooling. The heat medium flow path in the screw shaft having the spiral blades used in such a heat exchange device forms the heat medium flow path in the spiral blades, thereby improving the efficiency of heat exchange.

  So, for example, in the manufacturing method of the heat exchange apparatus of patent document 1, the side surface of a rotating shaft and a spiral blade is machined integrally, and the metal strip which straddles the top surfaces of an adjacent side surface is used. The spiral blade is provided on the outer periphery of the rotating shaft by winding and welding. Thereby, the heat medium flow path along the spiral blade can be formed.

Japanese Patent No. 2738298

  However, in the manufacturing method of the screw shaft having the spiral blade of Patent Document 1, the pair of protrusions constituting the side surface of the spiral blade must be cut out from the round bar, and the amount of cut out is very large. Processing takes time. In addition, it is very difficult to accurately fold a thick strip in a spiral, and it is extremely difficult to accurately position the folded strip.

  This invention is made | formed in view of this point, The place made into the objective is to manufacture the screw shaft which has a spiral blade | wing provided with the heat medium flow path which continued easily inside.

  In order to achieve the above object, in the present invention, the spiral blade is formed by attaching a plurality of blade blocks.

  Specifically, according to the first aspect of the present invention, the rotary shaft includes a rotating shaft installed in the casing and a spiral blade spirally provided on the outer periphery of the rotating shaft, and at least a part of the rotating shaft and the spiral blade. It is premised on a method of manufacturing a screw shaft having spiral blades, in which a continuous heat medium flow path for circulating a heat medium is formed.

The above manufacturing method is
A shaft-side flow path is provided inside along the shaft center, and a concave groove constituting a part of the blade-side flow path and a positioning concave portion along the concave groove are formed in the center along the spiral blade on the outer periphery. A shaft forming step for forming a rotating shaft having a circular cross section,
A block forming a plurality of blade blocks forming a spiral blade by forming a block-side concave portion forming a part of the blade-side flow path on the bottom surface and arranged in a spiral on the outer periphery of the rotating shaft. Forming process;
The plurality of blade blocks are fitted in the positioning recesses in a spiral manner along the outer periphery of the rotary shaft, and the block side recesses and the recess grooves communicate with each other and continue the blade side flow. A pasting step for forming a path.

  According to the above configuration, since the side surface of the spiral blade can be formed by arranging a plurality of blade blocks, the outer diameter of the material before processing can be reduced, and the amount of cutting can be greatly reduced. In addition, since the outer peripheral surface of the spiral blade can be constituted by a plurality of blade blocks, it is not necessary to wind and paste the strip in a spiral shape, and the formation of the spiral blade is extremely easy. Further, since the space for the blade-side flow path can be secured by the concave groove, it is easy to communicate with the block-side concave portion of the blade block. In addition, since the blade block forms most of the side surface of the spiral blade, the height of the ridges can be minimized, and the amount of shaving can be greatly reduced as compared with the prior art. Further, since the blade block may be attached along the protrusions so as to be fitted into the positioning recess, the blade block can be easily positioned and the attaching operation is extremely easy.

In the second invention,
Based on the above screw shaft manufacturing method,
A shaft forming step for forming a rotary shaft having a circular cross section, wherein a shaft-side flow path is provided inside along the shaft center, and a positioning recess is provided on the outer periphery along the spiral blade;
A plurality of blade blocks constituting the spiral blade by forming a block-side concave portion constituting a part of the blade-side flow path along the spiral blade on the bottom surface and arranged in a spiral manner on the outer periphery of the rotating shaft. Forming a block; and
And affixing step in which the plurality of blade blocks are affixed in a spiral manner along the outer periphery of the rotating shaft so as to be fitted in the positioning recesses, thereby forming a continuous blade-side flow path.

  According to the above configuration, since the side surface of the spiral blade can be formed by arranging a plurality of blade blocks, the outer diameter of the material before processing can be reduced, and the amount of cutting can be greatly reduced. In addition, since the outer peripheral surface of the spiral blade can be constituted by a plurality of blade blocks, it is not necessary to wind and paste the strip in a spiral shape, and the formation of the spiral blade is extremely easy. Further, as compared with the first invention, the outer diameter of the material before shaving can be further reduced because the positioning recess is merely recessed without providing the protrusion. Further, since the blade block may be pasted so as to be fitted into the positioning recess, positioning of the blade block is simple and the pasting operation is extremely easy.

In the third invention, in the first invention,
The positioning recess comprises a stepped portion provided by expanding the width of the groove at the tip of the ridge.

  According to the above configuration, the positioning concave portion is formed by simply widening the groove when the concave groove is formed by machining in the protrusion, so that the positioning concave portion itself is very easy to form. The subsequent welding process becomes extremely efficient.

In a fourth invention, in any one of the first to third inventions,
In the sticking step, the plurality of blade blocks are welded from the outside of the positioning recess to form the spiral blade having a continuous outer surface.

  According to the above configuration, since the positioning recess is used for reliable positioning and welding is performed from the outside of the positioning recess, it is easy to form the outer peripheral surface of the continuous spiral blade without generating a gap.

In a fifth invention, in any one of the first to fourth inventions,
In the block forming step, a plurality of blade blocks having the same shape are cast,
In the pasting step, a plurality of the blade blocks having the same shape are spirally arranged side by side to form a continuous spiral blade.

  According to said structure, since it is casting, even if it is the shape twisted helically, the block for blades of the same shape can be manufactured accurately and easily. Since they have the same shape, there is no need to worry about the order of application, and the application process is facilitated.

The heat exchange device of the sixth invention is:
A screw shaft manufactured by the manufacturing method of any one of the first to fifth inventions;
A casing that rotatably supports the rotation shafts of the plurality of screw shafts such that the plurality of screw shafts are arranged in parallel with each other;
A circulation device that circulates the heat medium through the heat medium flow path.

  According to said structure, since the screw shaft which has the spiral blade manufactured simply and at low cost can be utilized, initial investment and a maintenance cost can be reduced.

  As described above, according to the present invention, a plurality of blade blocks are affixed in a spiral manner along the positioning recesses formed on the outer periphery of the rotating shaft, and the block recesses are communicated with the blade channel. By doing in this way, the screw shaft which has a spiral blade | wing provided with the heat-medium flow path which continued inside easily can be manufactured.

It is an expanded sectional view cut | disconnected and shown along I-wing periphery of FIG.2 (b) along a spiral blade. (A) is a side view which shows the heat exchange apparatus which concerns on embodiment of this invention partially fractured | ruptured, (b) is a side view which shows a screw shaft. It is the III-III line expanded sectional view of FIG. It is a side view which shows the block for blades. It is the perspective view which looked at the block for blades from the outer peripheral side. It is the perspective view which looked at the block for blades from the inner peripheral side. FIG. 4 is a view corresponding to FIG. 3 according to a modification of the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2A shows a part of the heat exchange device 1 to which the screw shaft 3 having the spiral blade 5 according to the embodiment of the present invention is attached. In the heat exchange device 1, a pair of screw shafts 3 are installed in a cylindrical casing 2.

  The casing 2 is formed with a material charging port 2a into which powder, liquid (slurry, including viscous fluid) or the like as a material to be kneaded is charged. A material discharge port 2b is formed on the lower surface of the casing 2 so that the material after kneading is discharged (the flow of the material is indicated by a white arrow). The casing 2 is formed with a jacket portion 2c, and heat exchange is possible by supplying a heat medium to the outer periphery of the casing 2.

  In the present embodiment, a pair of screw shafts 3 are installed in parallel on the casing 2 and rotated in different directions, whereby the material to be kneaded is kneaded while meshing the respective spiral blades 5. In the present embodiment, the number of spiral blades 5 is different between the pair of screw shafts 3, for example, the right screw shaft 3 is a double thread, whereas the left screw shaft 3 is a single thread. Thus, the rotational speed of the left screw shaft 3 can be doubled. However, the number of the spiral blades 5 of the pair of screw shafts 3 may be the same, or may be provided as 1: 3, 2: 3, or the like.

  As shown in FIGS. 1 and 2, each screw shaft 3 has a spiral blade 5 spirally formed on the outer periphery of a cylindrical rotating shaft 4. A heat medium flow path 6 through which warm water, water vapor, cooling water, oil and the like are circulated as a heat medium is formed in at least a part of the rotating shaft 4 and the spiral blade 5. The heat medium flow path 6 is connected to the center of the rotating shaft 4 via an axial flow path 6a extending linearly in the axial direction and a connecting path 6c extending radially to the axial flow path 6a. And a blade-side flow path 6b extending along the line. As shown in FIG. 2, a rotary joint 7 is connected to the right side of the screw shaft 3, and this rotary joint 7 is connected to a heat medium circulation device (not shown) so that the heat medium can be introduced and discharged. . The shaft-side flow path 6a can introduce and discharge the heat medium through a single flow path, for example, by inserting a hollow pipe (not shown) from the inside of the rotary joint 7 side. Specifically, the heat medium supplied to the rotary joint 7 passes through the pipe of the right-side shaft-side flow path 6a in FIG. 2 and is supplied to the left end or through the connection path 6c. Proceeding radially outward, it passes spirally from the left side to the right side in the blade-side flow path 6b in the spiral blade 5, passes through the outer periphery of the pipe of the shaft-side flow path 6a, and is discharged from the rotary joint 7. Yes.

  As shown in FIG. 1, which shows a cross section cut along the spiral blade 5, the spiral blade 5 is formed by continuously pasting a plurality of blade blocks 8. As shown in FIG. 3, the radially outer side of the blade-side channel 6 b is configured by a block-side recess 8 a formed inside the blade block 8. The inner side in the radial direction of the blade-side flow path 6b is formed by a concave groove 9a formed in a protrusion 9 formed on the outer periphery of the rotating shaft 4. The concave groove 9a is formed so as to cause the protrusion 9 to be recessed, and the positioning recess 9b extends along the protrusion 9 so that the groove width at the tip (radially outer end) of the protrusion 9 is widened. Is formed.

  Next, a method for manufacturing the screw shaft 3 of this embodiment will be described in detail.

  First, a cylindrical steel bar such as carbon steel or stainless steel is prepared. In the shaft forming step, the rotating shaft 4 is formed by cutting the outer peripheral surface of the steel bar. The outer diameter of both ends of the rotating shaft 4 is cut to an outer diameter smaller than the middle so that the rotary joint 7 can be connected, or spline processing can be applied to connect to a rotating device (not shown). In the center of the rotating shaft 4, a straight shaft-side flow path 6a is formed along the axial center by a drill hole or the like. For example, a cylindrical pipe having an appropriate length (not shown) is inserted into a hole forming the shaft-side flow path 6a, thereby forming a forward path and a return path of the heat medium. In this shaft forming step, the ridge 9 along the spiral blade 5 is formed when the steel bar is cut. A concave groove 9 a is formed in the center of the ridge 9 along the ridge 9. At this time, the positioning concave portion 9b is formed so as to widen the groove width of the concave groove 9a on the distal end side of the protrusion 9. As shown in FIG. 1 in an enlarged manner, for example, the tip of the shaft side flow path 6a is connected in the radial direction by the connecting path 6c so that the tip of the shaft side flow path 6a is continuous with one end of the concave groove 9a.

  Apart from this, in the casting process, a plurality of blade blocks 8 forming the spiral blades 5 are cast. For example, precision casting may be performed with high precision. As shown in FIGS. 3 to 6, the blade block 8 has four side surfaces, and the bottom surface is formed with a block-side recess 8 a that is recessed toward the outer peripheral surface, and the whole is twisted spirally. ing. Since it is a casting, if a mold having the same shape is used, even if it is a complicated shape having such a twisted outer shape and having a block side recess 8a inside, the same shape can be manufactured in large quantities with high accuracy. be able to.

  Next, in the pasting step, a plurality of blade blocks 8 are spirally arranged along the outer periphery of the rotating shaft 4 and pasted. At this time, the blade block 8 may be attached so as to be pressed against the positioning recess 9b, so that there is no displacement in the axial direction of the rotating shaft 4 and positioning is extremely possible even if some manufacturing error occurs. Easy. As shown in a cross section in FIG. 3, the blade block 8 is attached and welded along the upper surface of the protrusion 9. For example, as shown in FIG. 1, the block-side recess 8 a of the end blade block 8 is closed by welding a shielding plate 10 or the like.

  Since all the blade blocks 8 of the same screw shaft 3 have the same shape, there is no need to worry about the order of attachment, and the blade blocks 8 are pressed against the pair of positioning concave portions 9b. Since the blade blocks 8 may be attached side by side, the attaching process is extremely easy. By sticking, the block-side recess 8a formed on the bottom surface side of the blade block 8 communicates with the groove 9a to form a spiral blade-side channel 6b. Since the chamfers 8b are formed at both ends of the blade block 8, when the adjacent blade blocks 8 are abutted, both of the chamfers 8b become a welding groove and are easily welded. It is easy to make the outer surface of the spiral blade 5 smoothly continuous without a gap. Moreover, since it can contact | adhere by welding, it is easy to comprise so that the blade | wing side flow path 6b does not communicate with the exterior and a heat carrier does not leak outside. Moreover, since the protrusion 9 receives heat influence at the time of welding mainly, the rigidity as the whole rotating shaft 4 falls and it is hard to deform | transform.

  Further, since the outer peripheral surface of the spiral blade 5 can be constituted by a plurality of blade blocks 8, there is no need to wrap and paste the belt plate in a spiral manner as in the prior art, and positioning is easy, and the formation of the spiral blade 5 is possible. It becomes extremely easy.

  Moreover, the space | gap of the blade | wing side flow path 6b can be ensured by the concave groove 9a, and it can be connected to the block side recessed part 8a of the block 8 for blade | wings, and the continuous blade | wing side flow path 6b can be formed.

  Further, since the blade block 8 forms most of the side surface of the spiral blade 5, the height of the ridge 9 can be minimized, and the amount of shaving can be greatly reduced as compared with the prior art.

  Therefore, according to the manufacturing method of the screw shaft 3 having the spiral blade 5 according to the present embodiment, the plurality of blade blocks 8 are pressed against the positioning recesses on the outer periphery of the rotating shaft 4 and pasted in a spiral pattern. By making the side recessed portion 8a communicate with the blade-side flow path 6b, the screw shaft 3 having the spiral blade 5 provided with the heat medium flow path 6 continuous inside can be easily manufactured.

  Moreover, since the heat exchange apparatus 1 can utilize the screw shaft 3 having the spiral blade 5 manufactured easily and at low cost, the initial investment and the maintenance cost can be reduced.

-Modification-
FIG. 7 shows a modification of the embodiment of the present invention, which differs from the above embodiment in that the configuration of the spiral blade 5 is different. In the following modification, the same portions as those in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this modification, first, in the shaft formation step, when cutting out from the steel bar, as shown in FIG. 7, unlike the above embodiment, no protrusion 9 is provided, and the rotation shaft 4 side is positioned. Only the concave portion 9b is recessed. If it does so, compared with the said embodiment, the outer diameter of a steel bar can be made still smaller and not only material cost will become cheap, but the amount of cutting will reduce significantly and a process will become easy.

  In the present modification, in the block forming step, as shown in FIG. 7, a blade block 8 'having a larger outer shape and higher height than the embodiment is cast.

  In the attaching step, the blade block 8 'is attached by welding or the like along the positioning recess 9b. If welding is performed using the chamfer 8b of the affixing surface of the blade block 8 ', the watertight blade-side flow path 6b can be formed in the interior by the positioning recess 9b and the chamfer 8b. The blade side channel 6b may have a larger cross section than the above embodiment. However, it is necessary to take measures against the thermal influence during welding on the outer periphery of the rotary shaft 4 as much as there is no protrusion 9.

  In this modification, since the space for the blade-side flow path 6b can be secured by the positioning recess 9b, it is easy to communicate with the block-side recess 8a of the blade block 8 '. If a sufficient space cannot be secured by the block-side recess 8a, a narrower groove may be provided along the spiral blade 5 on the radially inner side of the positioning recess 9b.

  Further, as compared with the above-described embodiment, since the positioning recess 9b is merely recessed without providing the protrusion 9, the outer diameter of the material before shaving can be further reduced.

  Further, since the blade block 8 has only to be pasted along the positioning recess 9b, positioning is easy and the pasting operation is easy.

  Therefore, also in the manufacturing method of the screw shaft 3 having the spiral blade 5 according to this modification, the screw shaft 3 having the spiral blade 5 provided with the heat medium flow path 6 continuous therein can be easily manufactured.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above-described embodiment, the pair of screw shafts 3 are installed on the casing 2 in parallel and are rotated in the direction facing each other. However, both may be rotated in the same direction.

  In the above embodiment, the blade blocks 8, 8 'are formed by casting, but the present invention is not limited to this, and other methods may be used. For example, when the screw shaft 3 is formed of a resin molded product, the blade blocks 8 and 8 ′ may be formed of a resin molded product.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 Heat exchange device
2 Casing
2a Material input
2b Material outlet
2c Jacket part
3 Screw shaft
4 Rotating shaft
5 Spiral feather
6 Heat medium flow path
6a Shaft side flow path
6b Blade side flow path
7 Rotary joint
8,8 'blade block
8a Block side recess
8b Chamfer
9 ridges
9a Groove
9b Recess for positioning
10 Shield plate

Claims (6)

A continuous heat medium flow comprising a rotating shaft installed in the casing and a spiral blade spirally provided on the outer periphery of the rotating shaft, and circulating a heat medium through at least a part of the rotating shaft and the spiral blade. In a method for manufacturing a screw shaft having spiral blades, in which a path is formed,
A shaft-side flow path is provided inside along the shaft center, and a concave groove constituting a part of the blade-side flow path and a positioning concave portion along the concave groove are formed in the center along the spiral blade on the outer periphery. A shaft forming step for forming a rotating shaft having a circular cross section,
A block forming a plurality of blade blocks forming a spiral blade by forming a block-side concave portion forming a part of the blade-side flow path on the bottom surface and arranged in a spiral on the outer periphery of the rotating shaft. Forming process;
The plurality of blade blocks are fitted in the positioning recesses in a spiral manner along the outer periphery of the rotary shaft, and the block side recesses and the recess grooves communicate with each other and continue the blade side flow. A method for producing a screw shaft having a spiral blade, comprising: an attaching step for forming a path. A continuous heat medium flow comprising a rotating shaft installed in the casing and a spiral blade spirally provided on the outer periphery of the rotating shaft, and circulating a heat medium through at least a part of the rotating shaft and the spiral blade. In a method for manufacturing a screw shaft having spiral blades, in which a path is formed,
A shaft forming step for forming a rotary shaft having a circular cross section, wherein a shaft-side flow path is provided inside along the shaft center, and a positioning recess is provided on the outer periphery along the spiral blade;
A plurality of blade blocks constituting the spiral blade by forming a block-side concave portion constituting a part of the blade-side flow path along the spiral blade on the bottom surface and arranged in a spiral manner on the outer periphery of the rotating shaft. Forming a block; and
Including a pasting step in which the plurality of blade blocks are affixed in a spiral manner along the outer periphery of the rotating shaft so as to be fitted into the positioning recesses, and the continuous blade-side flow path is formed. A method of manufacturing a screw shaft having spiral blades. In the manufacturing method of the screw shaft which has the spiral blade according to claim 1,
The method of manufacturing a screw shaft having a spiral blade, wherein the positioning concave portion includes a stepped portion provided by expanding a width of the concave groove at the tip of the protrusion. In the manufacturing method of the screw shaft which has a spiral blade according to any one of claims 1 to 3,
In the sticking step, the plurality of blade blocks are welded from the outside of the positioning recesses to form the spiral blades having a continuous outer surface. In the manufacturing method of the screw shaft which has a spiral blade according to any one of claims 1 to 4,
In the block forming step, a plurality of blade blocks having the same shape are cast,
A method for producing a screw shaft having a spiral blade, wherein the plurality of blade blocks having the same shape are attached in a spiral manner to form a continuous spiral blade in the attaching step. A screw shaft manufactured by a method of manufacturing a screw shaft having a plurality of spiral blades according to any one of claims 1 to 5,
A casing that rotatably supports the rotation shafts of the plurality of screw shafts such that the plurality of screw shafts are arranged in parallel with each other;
And a circulation device for circulating the heat medium through the heat medium flow path. A heat exchange device comprising a screw shaft having a spiral blade.

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