JP2018096655A - Tube with spirally corrugated groove, heat exchanger, and method of manufacturing tube with spirally corrugated groove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube with a spirally corrugated groove which has high heat transfer performance, a heat exchanger which uses the tube with the groove, and a method of manufacturing the tube with the spirally corrugated groove that can easily perform molding processing on the tube with the groove with a small man-hour.SOLUTION: A tube with a spirally corrugated groove is characterized in that: a circular tube is provided, on its outer peripheral surface 10, with a radially two-staged deformation part consisting of at least one groove part 11 in a spirally corrugated shape along a longer direction of the circular tube and a radially outer deformation part (hollow 12) of the circular tube formed continuously in a bottom part longer direction of the groove part, and also provided, on its inner peripheral surface 20, with a radially two-staged deformation part consisting of a projection part 21 in a spirally corrugated shape corresponding to the groove part and a radially inner deformation part (projection part 22) formed at the projection part, corresponding to the outer deformation part, and intermittent in a longer direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spiral corrugated grooved tube used as a heat transfer tube for a heat exchanger such as a heat pump water heater, a heat exchanger, and a method of manufacturing a spiral corrugated grooved tube.

A heat transfer tube provided in a heat exchanger such as an air conditioner or a water heater has a grooved tube formed along a spiral curve in addition to a smooth tube (see, for example, Patent Document 1), or a recess on the outer surface of the tube. There are pipes having protrusions formed on the inner surface of the pipe. For example, as a heat exchanger, a row of dents (dents) is intermittently provided on the outer surface of the tube along at least one spiral curve formed on the outer surface of the metal circular tube. In addition, the heat transfer tube is processed so that a cross-sectional shape at the bottom surface and at an arbitrary height forms a circular / elliptical or asymmetrical elliptic curve, and a row of protrusions whose cross-sectional area decreases in the height direction is formed. There is a heat exchanger using (see, for example, Patent Document 2).
Japanese Patent Application Laid-Open No. H10-260260 discloses a configuration in which a row of dents is formed on the outer surface of the tube and a row of protrusions based on the dent is formed on the inner surface of the tube along the spiral curve 4. Reference numeral 4 denotes a virtual one in which the trajectory of the roll 10 is indicated by a broken line.

JP2003-126916A (FIG. 1) JP 61-280390 A (FIG. 5)

In order to improve the heat transfer performance of the heat transfer tube, the heat transfer area in the tube is increased by forming recesses or depressions (hereinafter referred to as “dents”) intermittently in the groove part of the spiral corrugated grooved tube, In addition, it is conceivable that high heat transfer performance can be obtained by inducing further disturbance in the fluid flowing in the pipe.
Such a spiral corrugated grooved tube having intermittent depressions is formed, for example, by first forming a spiral groove using a roller-like processing tool on a circular tube and then forming a gear-like shape on the spiral groove portion. However, it is difficult to match the period of the spiral groove with the period of the gear-shaped roll depression, especially in the case of long pipes. There is a problem that difficulty is further increased because highly accurate cycle adjustment is required. In addition, it is difficult to selectively determine the formation position of the recess in the groove portion of the spiral grooved tube, and since the processing process is a two-step process, there is a problem that quality and yield are poor and this causes cost increase. It was.
In addition, it is conceivable to use a circular tube in which only a recess is formed spirally without a spiral groove, and it is possible to add a spiral groove process along the recess later. There are problems that it is difficult to match the period of the grooves and that it is difficult to selectively form the recessed portion, and this has not been realized in the prior art.

  The present invention has been made in view of the above circumstances, and the heat transfer area in the pipe is increased by providing a radially deformed portion such as an intermittent depression in the groove direction in the groove portion of the spiral waveform. A spiral corrugated grooved tube that induces turbulence in the fluid flowing in the tube to obtain high heat transfer performance, a heat exchanger using the grooved tube, and the grooved tube can be easily processed with a small number of processing steps. It aims at obtaining the manufacturing method of the spiral corrugated grooved pipe | tube which can be shape | molded into.

The spiral corrugated grooved tube according to the present invention is formed on the outer peripheral surface of the circular tube intermittently in the longitudinal direction of at least one spiral corrugated groove along the longitudinal direction of the circular tube and the bottom of the groove. A radially outer deformed portion of the circular pipe, and a two-stage deformed portion is provided in the radial direction, and a spiral corrugated ridge corresponding to the groove portion on the inner peripheral surface of the circular pipe; A two-stage deformed portion is provided in the radial direction, the inner deformed portion being intermittent in the longitudinal direction corresponding to the outer deformed portion formed on the protruding portion, and the radially deformed portion. is there.
Further, the heat exchanger according to the present invention is formed on the outer peripheral surface of the circular tube intermittently in the longitudinal direction of at least one spiral corrugated groove along the longitudinal direction of the circular tube and in the longitudinal direction of the bottom of the groove. A radially outer deformed portion of the circular pipe, and a two-stage deformed portion in the radial direction is provided; a spiral corrugated ridge corresponding to the groove portion on the inner peripheral surface of the circular pipe; and Using a spiral corrugated grooved tube provided with a radially deformed inner deformed portion corresponding to the outer deformed portion formed on the ridge, and a radially deformed two-stage deformed portion. It was.
Further, in the manufacturing method of the spiral corrugated grooved tube according to the present invention, at least one is arranged on the outer peripheral portion of the circular tube as a work held at a predetermined position, and the predetermined method is used with respect to the tube axis direction of the circular tube. A processing tool comprising a roller rotatably held around an angle inclined shaft and having at least one protrusion in the circumferential direction protruding radially from the outer peripheral surface thereof is provided on the outer peripheral surface of the circular pipe. By rolling in the tube axis direction of the circular tube in the pressed state, at least one spiral corrugated groove portion along the tube axis direction and the bottom portion of the groove portion are further formed on the outer peripheral surface of the circular tube. A spiral corrugated grooved tube in which a plurality of depressions corresponding to the protrusions intermittently dented in the central direction of the tube are formed is obtained.

The spiral corrugated grooved tube of the present invention has a spiral corrugated ridge corresponding to the groove on the outer peripheral surface on the inner peripheral surface of the circular tube, and a longitudinal length corresponding to the outer deformed portion formed on the ridge. Since the two-stage deformed portion in the radial direction of the circular tube, which is composed of the radially inner deformed portion intermittent in the direction, is provided in the longitudinal direction of the circular tube, the heat transfer area in the tube is increased. High heat transfer performance can be obtained by inducing turbulence in the fluid flowing in the pipe.
Further, according to the heat exchanger using the spiral corrugated grooved tube of the present invention, on the inner peripheral surface of the circular tube, the spiral corrugated protrusion corresponding to the groove on the outer peripheral surface, and the protrusion By providing a two-stage deformed portion in the longitudinal direction of the circular tube in the radial direction of the circular tube composed of the radially deformed inner deformed portion intermittent in the longitudinal direction corresponding to the formed outer deformed portion, As the heat transfer area is increased and disturbance is induced in the fluid flowing in the pipe to obtain high heat transfer performance, a heat exchanger excellent in heat exchange efficiency can be obtained.
Further, according to the manufacturing method of the spiral corrugated grooved tube of the present invention, a processing tool having at least one protrusion in the circumferential direction protruding radially from the roller-shaped outer peripheral surface is pressed against the outer peripheral surface of the circular tube. In this state, by rolling in the tube axis direction of the circular tube, at least one spiral wavy groove along the tube axis direction and the bottom of the groove portion further toward the center of the tube. Since a spiral corrugated grooved tube formed with a plurality of recesses corresponding to the protrusions intermittently recessed is obtained, the formation of the spiral corrugated groove and the formation of the recess in the groove are collectively performed. Processing can be performed, the number of processing steps can be reduced, and processing costs can be reduced.

The fragmentary sectional view which shows the helical corrugated grooved tube which concerns on Embodiment 1 of this invention. It is a principal part detail drawing which shows the groove part of the helical corrugated grooved tube shown in FIG. 1, and the circular hollow formed in the groove part, (a) is an external view, (b) is a cross-sectional end view in the AA line . It is a figure which shows the processing tool by which the processus | protrusion was provided in the roller outer peripheral part in the manufacturing method of the spiral corrugated grooved tube shown in FIG. 1, (a) is a front view, (b) is a top view. It is a figure which shows the protrusion part of the processing tool shown by FIG. 3, (a) is a top view of protrusion, (b) is a front view of a protrusion part. It is a figure which shows notionally the principal part of the manufacturing method of the spiral corrugated grooved tube which concerns on Embodiment 1 of this invention, (a) is a figure explaining the positional relationship of the processing tool with respect to a workpiece | work, (b) is The top view explaining the relationship between the rotating shaft of a processing tool, and the pipe-axis direction of a workpiece | work. It is principal part detail drawing which shows the groove part of the helical corrugated grooved tube which concerns on Embodiment 2 of this invention, and the elliptical hollow formed in the groove part, (a) is an external view, (b) is BB. Sectional end view in line. FIGS. 7A and 7B are main part detail views showing a recess having an elliptical shape with a flat bottom, which is a modification of FIG. 6, wherein FIG. 7A is an external view, and FIG. FIGS. 7A and 7B are main part detail views showing an asymmetrical elliptical depression according to another modification of FIG. 6, wherein FIG. 7A is an external view, and FIG. 7B is a cross-sectional end view taken along line DD. FIGS. 7A and 7B are diagrams conceptually showing a protrusion portion of the processing tool forming the elliptical recess shown in FIG. 6, wherein FIG. 7A is a top view of the protrusion and FIG. FIGS. 8A and 8B are diagrams conceptually showing a protrusion portion of the processing tool that forms a recess having an oval shape and a flat bottom portion shown in FIG. 7, wherein FIG. 8A is a top view of the protrusion and FIG. It is a figure which shows notionally the protrusion part of the processing tool which forms the asymmetrical elliptical-shaped hollow shown by FIG. 8, (a) is a top view of protrusion, (b) is a front view of a protrusion part. The fragmentary sectional view which shows the spiral corrugated grooved tube which concerns on Embodiment 3 of this invention. Explanatory drawing which shows the manufacturing method of the spiral corrugated grooved tube which concerns on Embodiment 3 of this invention. The fragmentary sectional view which shows the spiral corrugated grooved tube which concerns on Embodiment 4 of this invention. The expanded view of the helical corrugated grooved tube which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
1 is a partial sectional view showing a spiral corrugated grooved tube according to Embodiment 1 of the present invention, and FIG. 2 is a groove portion of the spiral corrugated grooved tube shown in FIG. 1 and a circular depression formed in the groove portion. FIG. 2 is a detailed view of the main part, showing (a) an external view and (b) a sectional end view taken along the line AA. The spiral corrugated grooved tube 1 shown in FIG. 1 is a heat exchanger such as an air conditioner or a heat pump water heater that exchanges heat with a medium outside the tube by flowing a refrigerant inside the tube. It is used as
In the spiral corrugated grooved tube 1 of FIG. 1, a continuous groove portion 11 having a spiral waveform is formed on the outer peripheral surface 10 shown in the left half portion of the drawing along the spiral curve of the four strips here, and the groove portion 11. A row of intermittent depressions 12 in the longitudinal direction is formed in the bottom portion of the tube as an outer deformation portion in the radial direction of the circular tube. The spiral curve is formed in at least one line along the tube axis O direction of the spiral corrugated tube 1.

  As shown in the right half of FIG. 1, on the inner peripheral surface 20 that separates the tube wall, a spiral corrugated ridge portion 21 corresponding to the groove portion 11 of the outer peripheral surface 10, and a ridge portion of the ridge portion 21. The row | line | column of the intermittent protrusion 22 as the inner side deformation | transformation part to the radial direction of a circular pipe is formed in the position corresponding to the hollow 12 of the outer peripheral surface 10. Thereby, the inner peripheral surface 20 of the circular pipe of the present invention is provided with a two-step uneven deformed portion in the radial direction composed of the protruding portion 21 and the protruding portion 22. In addition, all of the groove part 11, the hollow 12, the protrusion part 21, and the protrusion part 22 are formed with the smooth curve including the boundary part with another area | region. In particular, the groove 11 and the ridge 21 are formed in a wave shape in the cross-sectional shape in the tube axis O direction (longitudinal direction) and the circumferential direction.

  Here, the depression 12 is formed as a circular depression 12A, and the protrusion 22 is formed as a protrusion 22A having a circular shape (partially a part of a spherical body), but the shape is not particularly limited. The recess 12 of the outer peripheral surface 10 may be configured as a radially outer deformed portion of the circular pipe formed intermittently in the bottom longitudinal direction of the groove 11, and the protrusion 22 of the inner peripheral surface 20 is a protrusion. What is necessary is just to be comprised as a radially inner deformation | transformation part intermittently formed in the longitudinal direction corresponding to the said outer deformation | transformation part formed in the part 21. FIG. Moreover, you may reverse the deformation | transformation to the radial direction for the hollow 12 and the protrusion part 22. FIG.

  As described above, the spiral corrugated grooves 11 formed on the outer peripheral surface 10 are intermittently formed in the rows of the recesses 12 and the protrusions 22 formed intermittently on the protrusions 21 of the inner peripheral surface 20. Here, the spiral corrugated grooved tube 1 provided with a row of circular protrusions 22A is used as a heat transfer tube of a heat exchanger. The fluid flowing in the pipe is greatly disturbed by the protrusion 21 corresponding to the spiral corrugated groove portion 11 formed in the spiral corrugated groove tube 1, and the flow of the fluid is greatly disturbed as the flow path cross-sectional area increases or decreases. A promoting effect is obtained. Furthermore, not only does the flow path cross-sectional area fluctuate finely due to the protrusions 22 protruding from the inner peripheral surface 20, but the surface area for heat exchange also increases. Then, the fluid flow is locally accelerated / decelerated by the protrusion 22 and a swirling flow is generated, and the heat transfer promoting effect is further improved.

  Next, a manufacturing method of the spiral corrugated grooved tube 1 shown in FIG. 1 will be described with reference to FIGS. 3A and 3B are diagrams showing a processing tool in which protrusions are provided on the outer peripheral portion of the roller in the method for manufacturing the spiral corrugated grooved tube shown in FIG. 1, wherein FIG. 3A is a front view and FIG. 3B is a plan view. . 4A and 4B are diagrams showing a protrusion portion of the processing tool shown in FIG. 3, wherein FIG. 4A is a top view of the protrusion, and FIG. 4B is a front view of the protrusion portion. FIG. 5 is a diagram conceptually showing the main part of the manufacturing method of the spiral corrugated grooved tube according to Embodiment 1 of the present invention, (a) is a diagram for explaining the positional relationship of the machining tool with respect to the workpiece, b) is a plan view for explaining the relationship between the rotation axis of the machining tool and the pipe axis direction of the workpiece.

  As shown in FIGS. 3 and 4, the processing tool 4 is pressed against the outer surface 110 of the circular tube 100 to be plastically deformed, and a cross section of the outer peripheral surface is formed to form the spiral corrugated groove 11 on the outer surface 110. It is formed in a substantially semicircular disk-like roller shape, and in addition, a recess 12 is formed in the roller outer peripheral portion 4a by further recessing the bottom of the groove portion 11 in the center direction of the circular tube 100. For this purpose, a plurality of (eight) protrusions 5 projecting in the radial direction at predetermined intervals in the circumferential direction, here, circular protrusions 5A as shown in FIG. 4 are provided. The outer diameter and thickness of the processing tool 4 and the shape and pitch of the protrusions 5 can be appropriately set as will be described later. At least one protrusion 5 is provided in the circumferential direction.

  In FIG. 5A, a circular tube 100 as a work is held by a claw 3 of a chuck for holding a circular tube so that it cannot rotate but can be moved in the direction of the tube axis O. At least one, or four, processing tools 4 are arranged around the tube axis O. When a plurality of processing tools 4 are arranged around the tube axis O, they are arranged so as to surround the circular tube 100 at an equal angle to each other, here 90 degrees. In addition, as the circular pipe 100, for example, a copper pipe material, an aluminum pipe material, and the like that are commercially available as industrial materials can be appropriately selected and used as desired.

  The roller-shaped processing tool 4 is not shown around the circular tube 100 in a state in which the relative position between the tube axis O and the processing tool 4 is maintained in a direction orthogonal to the tube axis O with respect to the circular tube 100. It is rotationally driven by a beating device. Along with this, the processing tool 4 is driven and rolled to the outer surface 110, which is an unprocessed portion of the circular tube 100, while pressing along at least one line, here, four spiral curves. Simultaneously with the formation of the corrugated groove 11, an intermittent row of recesses 12 is formed at the bottom of the spiral corrugated groove 11. The groove 11 and the recess 12 formed in the outer peripheral surface 10 of the spiral corrugated grooved tube 1 obtained by rolling the processing tool 4 constitute a two-stage deformed portion in the radial direction.

The direction of rotational driving of the processing tool 4 is relative to the opening (not shown) through which the circular pipes 100 formed at the center of the four processing tools 4 are inserted, as indicated by the arrow R in FIG. Thus, the rotation direction is such that the formed spiral corrugated grooved tube 1 extends on the side where the tube holding portion by the chuck claw 3 does not exist (the right side in the figure).
The positional relationship between the circular tube 100 and the processing tool 4 installed around the circular tube 100 at an equal angle of 90 degrees here is that the four processing tools 4 are all in plan view as shown in FIG. Is held at a predetermined inclination angle θ set in advance with respect to the direction of the tube axis O, and is parallel to the direction of the tube axis O when viewed from the side with respect to the posture of FIG. The processing tool 4 is disposed so as to be rotatably supported by the tool tilt axis O4, and each processing tool 4 is held so as to be movable and fixed to a desired pressing dimension with respect to the radial direction of the circular tube 100.

  A groove pitch P11 having a spiral waveform shown in FIG. 5A is determined by the inclination angle θ. When a plurality of processing tools 4 are arranged, each processing tool 4 has the same inclination angle θ, so that a groove pitch P11 having a spiral waveform corresponding to the inclination angle θ can be set. . The shape of the spiral waveform of the groove portion 11 is determined by the surface shape of the roller outer peripheral portion 4a. Since the surface shape has an R shape or a planar shape, various groove shapes can be created in a corrugated shape in the circular tube 100. Simultaneously with the grooving, the projection 5 of the processing tool 4 can have the recess 12 in the groove portion 11 by batch molding.

The pitch of the recesses 12 formed in the groove 11 in FIG. 1 is determined by the protrusion pitch P5 in the circumferential direction of the protrusion 5 protruding from the roller outer periphery 4a shown in FIG. The number of the protrusions 5 in the circumferential direction is not particularly limited, and may be one, for example, nine or more. The depth D12 of the circular recess 12A shown in FIG. 2B can be determined by adjusting the projection height H5 of the projection 5 provided on the roller outer peripheral portion 4a of FIG. 3 to a desired dimension.
Since the row of the protrusions 21 and the protrusions 22 on the inner peripheral surface 20 shown in FIG. 1 is formed along with the two-stage formation of the spiral corrugated grooves 11 and the recesses 12 on the outer peripheral surface 10, the protrusions 22 are formed. The circumferential pitch is determined to be the same as the circumferential pitch in which the depressions 12 are formed. Further, the height H22 of the circular protrusion 22A shown in FIG. 2 is determined by the depth D12 of the recess 12A being formed at a predetermined height.

  Next, the manufacturing method according to the first embodiment will be described. In a state where the unprocessed portion of the circular tube 100 is locked by the claw 3 of the chuck, the unprocessed portion of the circular tube 100 and the processed portion are processed with respect to the processed portion by the processing tool 4 having the protrusion 5 (5A). No active driving force in the direction of the tube axis O is generated from any direction of the spiral corrugated grooved tube 1. When a relative rotational driving force is applied to the circular tube 100 in the above-described state in the direction of twisting the processing tool 4 in the direction of arrow R in FIG. 5A, a predetermined inclination angle θ is generated around the circular tube 100. When the machining tool 4 that rotates on the connected machining tool tilt axis O4 is pushed into the outer surface 110 of the circular tube 100 toward the center of the circular tube 100, the spirally corrugated groove 11 and the recess 12 are simultaneously gathered in the radial direction. While forming a two-stage deformed portion, it is driven and rotated around the machining tool tilt axis O4, and a force is generated to advance the circular tube 100 in the direction of arrow H in FIG.

  The unprocessed portion of the circular tube 100 fixed with respect to the rotation direction by the claw 3 of the chuck is held in a state where it can move a predetermined distance along the tube axis O direction and is restricted in the rotation direction. The unprocessed part is moved in the direction of the arrow H together with the chuck claw 3 by the propulsive force that travels in the direction of the arrow H in FIG. Move. By continuing molding until the position of the chuck claw 3 in the direction of the tube axis O interferes with the holding drive mechanism (not shown) of the processing tool 4, the initial fixing position of the chuck claw 3 and the installation of the holding drive mechanism The spiral corrugated grooved tube 1 having a predetermined length determined by the distance to the position can be continuously formed. If a long one is required, for example, the chuck claw 3 is opened at one end and the position where the circular tube 100 is gripped is returned to the initial fixed position and re-gripped, or the claw 3 is moved in the direction of the tube axis O. This can be easily dealt with by expanding the possible range and providing a steadying mechanism for the circular tube 100 between the gripping position of the claw 3 and the holding drive mechanism.

  As described above, in the manufacturing method of the spiral corrugated grooved tube according to the first embodiment, the outer peripheral surface 110 of the circular tube as the workpiece is inclined at a predetermined inclination angle θ with respect to the tube axis O direction of the circular tube. The processing tool 4 having a disc-shaped roller rotatably held around the processing tool tilt axis O4 and having a projection 5 protruding radially from the roller outer peripheral portion 4a is connected to the outer peripheral surface of the circular tube 100. On the other hand, the non-processed part positioned on the side where the molding proceeds by the processing tool 4 in the tube axis O direction of the circular tube is locked so that it cannot rotate but can only move in the tube axis direction. By applying a relative torsional driving force to the support shaft (not shown) of the tool 4, the processing tool 4 is driven to roll freely and spirally along the tube axis direction on the outer peripheral surface 110 of the circular tube. The wave-shaped groove 11 and the bottom of the groove 11 are A plurality of recesses 12 corresponding to the projection 5 by recessing intermittently in a direction, but is obtained so as to obtain a spiral waveform grooved tube 1 formed in one step.

  In the present invention, the holding portion of the circular tube 100 by the chuck claw 3 is configured so that the unprocessed portion of the circular tube 100 is non-rotatable with respect to the forming processing portion by the processing tool 4 in the tube axis O direction of the circular tube 100. Since it is a mechanism that does not have a driving force in the direction of the tube axis O between the chuck claw 3 and the processing tool 4 only by being locked so as to be subordinately movable only in the direction of the axis O, it has a helical waveform. When the groove portion 11 is formed, the spiral corrugated grooved tube 1 having a good shape can be manufactured without the force of being crushed into a shape deviating from the normal spiral wave shape. In addition, by providing the chuck claw 3 for holding the circular tube on the unprocessed portion side of the circular tube 100, the tube wall having the shape of the spirally corrugated groove 11 immediately after processing exerts a force until buckling. Therefore, even if a mandrel for supporting the torsion of the tube is not inserted into the tube, the row of the spiral corrugated groove portions 11 and the recesses 12 and the protrusion to the inner peripheral surface 20 are large. It becomes possible to form the row of the ridges 21 and the protrusions 22.

  Further, the pitch and the number of protrusions 5 provided on the roller outer peripheral portion 4a of the processing tool 4 are controlled, so that the pitches at the recesses 12 on the outer peripheral surface 10 and the protrusions 22 on the inner peripheral surface 20 and the protrusions per one round tube. By adjusting the number of 22 formed, the pressure loss of the fluid flowing in the pipe and the surface area for heat exchange can be adjusted as necessary, and the heat transfer performance can be adjusted. In addition, since the roller-shaped processing tool 4 has the protrusions 5 on the roller outer peripheral portion 4a, the processing tool with the protrusions 5 can be freely changed without adjusting the groove period and the recess period of the spiral waveform. A spiral corrugated grooved tube can be made by varying the number of protrusions.

  Moreover, according to the said processing method, the spiral corrugated grooved tube 1 forms the spiral corrugated groove part 11 in the outer peripheral surface 10, and the intermittent hollow 12 is formed in the groove part 11, and the inner peripheral surface simultaneously. 20, a protruding portion 21 corresponding to the groove portion 11 and a protruding portion 22 protruding further from the protruding portion 21 toward the center of the tube are formed in two steps, and the protruding portion 22 of the inner peripheral surface 20 is crossed. The surface shape has a smooth arcuate waveform shape, and intermittent rows of protrusions 22 are formed on the inner peripheral surface 20 along the spiral curve direction following the spiral corrugated groove 11. Since the groove part 11 and the hollow part 12 and the protrusion part 21 and the protrusion part 22 can be easily batch-processed, the effect excellent in the reduction of a process man-hour and the reduction of a process cost is acquired. Also, one or more spirally corrugated grooves 11 can be formed by changing the number of processing tools 4 arranged around the circular tube 100.

  In addition, the spiral corrugated grooved tube 1 of the first embodiment is formed on the outer peripheral surface 10 of the circular tube manufactured by the above manufacturing method, and has at least one spiral corrugated groove portion 11 along the longitudinal direction of the circular tube. And a radially outer deformed portion of the circular pipe consisting of the depressions 12 formed intermittently in the longitudinal direction of the bottom of the groove, and a two-stage deformed portion in the radial direction is provided. The surface 20 has a spiral corrugated protrusion 21 corresponding to the groove 11 and a radially inner protrusion 22 formed in the protrusion corresponding to the outer deformation portion in the longitudinal direction. By providing the two-stage deformed portion in the radial direction including the deformed portion, the heat transfer area in the tube is increased, and the fluid flowing in the tube is disturbed by the spiral corrugated ridge portion 21. Not only can the protrusion 22 induce fluid turbulence even more. , High heat transfer performance can be obtained.

  Further, the heat exchanger according to the first embodiment uses the spiral corrugated grooved tube 1 manufactured by the above manufacturing method as a heat transfer tube, and according to the heat exchanger, the fluid flowing in the tube is The flow of the fluid is disturbed by the change in the cross-sectional area of the flow path by the protrusion 21 corresponding to the groove 11 of the spiral corrugated tube 1, and the tube axis direction or protrusion formed in the protrusion 21 is further disturbed. The surface area for heat exchange is increased by the protrusions 22 that are intermittent in the direction 21 and the fluid flow is locally accelerated / decelerated and a swirl flow is generated, so that a heat transfer promoting effect is obtained.

Embodiment 2. FIG.
6A and 6B are main part detail views showing a groove portion of the spiral corrugated grooved tube according to Embodiment 2 of the present invention and an elliptical depression formed in the groove portion, where FIG. 6A is an external view, and FIG. It is a sectional end view in the BB line. FIGS. 7A and 7B are main part detail views showing a recess having an elliptical shape with a flat bottom, which is a modified example of FIG. 6, wherein FIG. 7A is an external view, and FIG. 7B is a cross-sectional end view taken along line CC. FIGS. 8A and 8B are main part detail views showing an asymmetrical elliptical depression according to another modification of FIG. 6, wherein FIG. 8A is an external view and FIG. 8B is a cross-sectional end view taken along line DD. FIGS. 9A and 9B are diagrams conceptually showing a protruding portion of the processing tool for forming the elliptical recess shown in FIG. 6, wherein FIG. 9A is a top view of the protruding portion, and FIG. 9B is a front view of the protruding portion. FIGS. 10A and 10B are diagrams conceptually showing the projection portion of the machining tool that forms the recess having the elliptical shape and the bottom portion shown in FIG. 7, wherein FIG. 10A is a top view of the projection, and FIG. 10B is a front view of the projection portion. FIG. FIG. 11 is a diagram conceptually showing a projection part of the processing tool for forming the asymmetrical elliptical depression shown in FIG. 8, wherein (a) is a top view of the projection and (b) is a front view of the projection part. is there.

  In the second embodiment, the shape of the recess 12 provided on the bottom of the groove 11 having a spiral waveform is an elliptical shape and an elliptical shape with respect to the circular shape of the first embodiment. To have a flat shape (shape like the upper half of the ellipsoid when the top of the short axis of the ellipsoid is flat, or Mt. Fuji shape), or an asymmetric ellipse shape (or egg shape) Further, it can be selectively changed in the processing step. Needless to say, the shape of the protrusion 22 formed on the inner peripheral surface of the circular tube changes according to the shape of the recess 12.

  In the first embodiment, the shape of the recess 12 selectively and intermittently formed in the spiral corrugated groove portion 11 formed on the outer peripheral surface 10 is the circular shape shown in FIG. However, in the second embodiment, as other arbitrary shapes, the oval depression 12B shown in FIG. 6, the oval depression 12C having a flat bottom shown in FIG. 7, or the asymmetry shown in FIG. This is an elliptical recess 12D. The shape of the protrusion 22 of the inner peripheral surface 20 is determined corresponding to the shape of these recesses 12. The shape of the protrusion 22 of the first embodiment is determined as a circular protrusion 22A as shown in FIG. 2, but in the second embodiment, the elliptical protrusion 22B shown in FIG. This is formed as a Mt. Fuji-shaped protrusion 22C shown in FIG. 8, and an asymmetric elliptical protrusion 22D shown in FIG.

  As described above, the shape of the recess 12 formed in the spiral corrugated groove 11 of the spiral corrugated grooved tube 1 and the shape of the protrusion 22 of the inner peripheral surface 20 are determined by the shape of the protrusion 5 of the processing tool 4. The shape of the protrusion 5 on the roller outer peripheral portion 4a of the processing tool 4 in the first embodiment is the circular protrusion 12A and the circular protrusion 22A shown in FIG. 2 by using the circular protrusion 5A shown in FIG. However, in the second embodiment, the elliptical depression 12B and the elliptical protrusion 22B shown in FIG. 6 can be formed by using the elliptical protrusion 5B shown in FIG. 9 as another arbitrary shape, and FIG. By using the Mt. Fuji-shaped protrusion 5C shown in FIG. 7, an elliptical recess 12C having a flat bottom and a Mt. Fuji-shaped protrusion 22C shown in FIG. 7 are formed. By using the asymmetrical protrusion 5D shown in FIG. The asymmetrical elliptical recess 12D and the asymmetrical elliptical protrusion 22D can be formed.

  In addition, in the shape of the protrusion 5 of the roller outer peripheral portion 4a, it is avoided that the edge portion such as a corner is sharpened. For example, by applying a curved surface of R0.3 mm or more, the load of the rotational force of the processing tool 4 is applied. Can be reduced, and the resistance of forming the recess 12 (12A to 12D) into the circular tube 100 can be reduced.

As described above, according to the second embodiment, an elliptical recess 12B, which is selectively and intermittently formed in the spiral corrugated groove 11 formed on the outer peripheral surface 10, and an elliptical recess with a flat bottom. 12C, a spiral corrugated grooved tube having a row of various depressions 12 such as an asymmetric elliptical depression 12D, and a row of various protrusions 22 (22B to 22D) corresponding to the shape of the depression 12 on the inner peripheral surface 20 1 and a heat exchanger using the spiral corrugated grooved tube 1. Thus, by freely forming and adjusting the protrusion shape of the roller outer peripheral portion 4a of the processing tool 4, the inner periphery can be adjusted. The shape of the projection 22 on the surface can be determined, and the heat exchange performance and pressure loss can be adjusted by adjusting the shape of the projection 22 on the inner peripheral surface.
In addition, the shape of the dent 12 and the protrusion 22 is not limited to those illustrated, for example, a shape having a plurality of irregularities in the circumferential direction, or a deformed portion having a convex shape instead of the dent 12. Even if configured, the same effect can be obtained.

Embodiment 3 FIG.
FIG. 12 is a partial cross-sectional view showing a spiral corrugated grooved tube according to Embodiment 3 of the present invention, and FIG. 13 is an explanatory view showing a method of manufacturing the spiral corrugated grooved tube according to Embodiment 3 of the present invention. is there. In addition, this Embodiment 3 has the hollow 12 in one pipe | tube by using both the processing tool 4A which provided the processus | protrusion 5, and the processing tool 4A which does not provide the processus | protrusion 5 as a roller-shaped process tool. The spiral corrugated grooved tube 1A in which both the spiral corrugated groove portion 11 and the spiral corrugated groove portion 11E having no depression are formed is obtained.

  As shown in FIG. 13, the spiral corrugated grooved tube 1A according to Embodiment 3 shown in FIG. 12 omits the processing tool 4 having the protrusion 5 and the roller-shaped processing tool 4A having no protrusion. Are attached two by two around the tube axis O at equal angles, pressed against the outer surface of the circular tube 100, and a plurality of (four) spiral curves as in the first embodiment shown in FIG. , The spiral corrugated groove portion 11 having intermittent rows of recesses 12 on the outer peripheral surface 10 and the spiral corrugated groove portion 11E having no rows of recesses 12 are formed. The inner peripheral surface 20 is formed with a protrusion 21 having an intermittent protrusion 22 in the direction of the tube axis O and a protrusion 21E having no protrusion 22.

  According to Embodiment 3 as described above, the number of depressions 12 and protrusions 22 formed in the spiral corrugated grooved tube 1A can be adjusted in units of grooves. By adjusting the number of the protrusions 22 formed, the pressure loss of the fluid flowing in the pipe and the surface area for heat exchange can be adjusted as necessary, so that a further effect that the heat transfer performance can be adjusted is obtained.

Embodiment 4 FIG.
FIG. 14 is a partial sectional view showing a spiral corrugated grooved tube according to Embodiment 4 of the present invention, and FIG. 15 is a development view of the spiral corrugated grooved tube according to Embodiment 4 of the present invention. In the fourth embodiment, the depression 12 (and thus the protrusion 22 on the inner peripheral surface) provided in the groove portion of the spiral waveform is arranged with a phase difference in the rotation circumferential direction of the circular tube. is there. In addition, since the principal part of the processing apparatus used for manufacture is the same as that of FIG. 5 which concerns on Embodiment 1, it demonstrates with reference also to FIG. In FIG. 15, the horizontal axis is the direction of the tube axis O, the vertical axis is the angle in the circumferential direction of the spiral corrugated grooved tube 1B (the upper end is 360 degrees when the lower end is 0 degrees), and the oblique broken line is Each of the extending directions of the aforementioned four spiral waveform curves (groove portions 11A to 11D) is shown.

  The spiral corrugated grooved tube 1B shown in FIG. 14 is configured so that the transfer positions of the four protrusions 5 of the machining tool 4 provided at 90 degrees around the circular tube 100 that is the workpiece are relative to the workpiece in the rotational circumferential direction. The outer surface of the pipe is arranged with a phase difference, the processing tool 4 is pressed against the outer surface 110 of the circular tube 100, and rolled while pressing along a plurality of spiral curves, here four. A spiral corrugated groove portion 11 (11A, 11B, 11C, and 11D) is formed in the portion, and a row of depressions 12 arranged so as to shift the phase is formed with a phase difference. Here, the phase difference F of the depressions 12 arranged so as to shift the phase is about 45 degrees as shown in the developed view of FIG.

  As shown in FIG. 15, in this example, the projections 5 of the two processing tools 4 disposed diagonally corresponding to the groove 11B and the groove 11D are pressed against the outer surface of the circular tube 100 at the same time. The protrusions 5 are respectively transferred to the 11B and the groove 11D, and the recesses 12 are formed simultaneously. On the other hand, the projections 5 of the other two processing tools 4 disposed on the diagonals corresponding to the groove 11A and the groove 11C are the grooves 11A on the outer surface when the circular tube 100 is moved by a predetermined dimension in the tube axis direction. The circular tube 100 is simultaneously pressed against the groove portion 11C at a position rotated 45 degrees in the rotation direction, and the protrusions 5 are similarly transferred to form the recesses 12 in both groove portions at the same time. Thereafter, the rotation of the processing tool 4 relative to the circular tube 100 is rotationally driven in the torsional direction, and the formation of the groove 11 and the formation of the recess 12 are continuously performed along four spiral curves, as shown in FIG. A spiral corrugated grooved tube 1B is obtained in which the position of the recess 12 (and hence the protrusion 22 on the inner peripheral surface) in the rotational circumferential direction of the circular tube is such that the phase difference F is 45 degrees.

  As described above, in the fourth embodiment, the recesses 12 (or the protrusions adjacent in the circumferential direction of the inner peripheral surface 20) of the groove portions 11 (groove portions 11A to 11D) adjacent in the circumferential direction of the spiral corrugated grooved tube 1B. Since the positions of the protrusions 22) of the portion 21 can be arranged so as to shift the phase in the direction of the tube axis O, the fluid flow can be expected to be further disturbed, thereby promoting the heat transfer. The spiral corrugated grooved tube 1B having an excellent heat exchange effect or a heat exchanger (not shown) is obtained.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1, 1A, 1B Spiral corrugated grooved tube, 100 circular tube, 110 outer surface, 10 outer peripheral surface, 11 (11A, 11B, 11C, 11D), 11E groove, 12 recess,
12A Circular recess, 12B Oval recess,
12C Elliptical depression with flat bottom, 12D Asymmetric elliptic depression,
20 inner peripheral surface, 21, 21E ridge, 22 protrusion, 22A circular protrusion,
22B Ellipse-shaped protrusion, 22C Fuji-mountain protrusion, 22D Asymmetric ellipse-shaped protrusion,
3 claw, 4 processing tool, 4a roller outer peripheral part, 5, 5A, 5B, 5C, 5D protrusion, D12 depth of depression, F phase difference, H5 protrusion height, H22 protrusion height,
P5 protrusion pitch, P11 groove pitch, O tube axis, O4 machining tool tilt axis,
θ Tilt angle.

Claims (9)

  On the outer peripheral surface of the circular tube, at least one spiral corrugated groove portion along the longitudinal direction of the circular tube, and a radially outer deformed portion of the circular tube formed intermittently in the bottom longitudinal direction of the groove portion, Are provided with two-stage deformed portions in the radial direction, and on the inner peripheral surface of the circular tube, a spiral corrugated ridge corresponding to the groove, and the outer deformed portion formed on the ridge. A spiral corrugated grooved tube comprising a radially deformed inner deformed portion intermittently extending in the longitudinal direction and two deformed portions in the radial direction.   2. The spiral corrugated grooved tube according to claim 1, wherein the outer deformed portion is formed of a recess in which a bottom portion of the groove portion is recessed in a center direction of the circular tube.   3. The spiral corrugated grooved tube according to claim 2, wherein the recess has a circular shape, an elliptical shape, an elliptical shape with a flat bottom, or an asymmetrical elliptical shape when viewed from above.   A heat exchanger using the spiral corrugated grooved tube according to any one of claims 1 to 3.   At least one roller is provided on the outer periphery of a circular tube as a work held at a predetermined position, and is rotatably held around an axis inclined at a predetermined angle with respect to the tube axis direction of the circular tube. And rolling a processing tool having at least one protrusion in the circumferential direction protruding radially from the outer peripheral surface thereof in the tube axis direction of the circular tube while being pressed against the outer peripheral surface of the circular tube. And a plurality of spiral corrugated grooves along the tube axis direction on the outer peripheral surface of the circular tube, and a plurality of protrusions corresponding to the protrusions in which the bottom of the groove portion is further recessed intermittently in the central direction of the circular tube. The manufacturing method of the spiral corrugated grooved tube which obtains the spiral corrugated grooved tube in which the hollow was formed.   The spiral corrugated grooved tube according to claim 5, wherein the processing tool arbitrarily selected from a plurality of the processing tools prepared in advance and having different projection shapes is used. Manufacturing method.   The spiral shape according to claim 5 or 6, wherein the number of the depressions formed per one circumference of the circular pipe is adjusted by changing the pitch or number of the protrusions in the processing tool. A method of manufacturing a corrugated grooved tube.   A plurality of the processing tools can be disposed on an outer peripheral portion of the circular pipe, and at least one of the plurality of processing tools is uniform in a circumferential direction in which the protrusion is not provided. 8. A method for manufacturing a spiral corrugated grooved tube according to claim 5, wherein a tube having a peripheral surface is used.   A plurality of the processing tools provided with the protrusions are disposed on the outer peripheral portion of the circular pipe, and the pipes of the recesses in the plurality of groove portions respectively formed on the outer peripheral surface of the circular pipe by the processing tool. The position in the rotation direction of the protrusion in the processing tool is shifted among the plurality of processing tools so that an axial position is formed with a phase difference between the adjacent groove portions. A method for producing a spiral corrugated grooved tube according to any one of claims 5 to 7.

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