JP5718028B2 - Double pipe - Google Patents

Description

  The present invention relates to a double pipe for a heat exchanger provided in, for example, a heat pump type floor heater, a hot water heater, an air conditioner, and the like, and more specifically, a fluid flowing inside the inner pipe, the inner pipe, and the inner pipe The present invention relates to a double pipe that exchanges heat with a fluid that flows between an outer pipe provided outside.

  Conventionally, as the above-described double pipe, for example, an inner pipe in which a refrigerant flow path is formed inside and an outer pipe in which a water flow path is formed between the inner pipe and the inner pipe are provided. There has been proposed a heat exchanger (see Patent Documents 1 and 2) including a double pipe composed of a pipe.

  In detail, the double pipes described in Patent Documents 1 and 2 are usually arranged in a spiral shape, and the end of the inner pipe is connected to a device such as a heat pump type hot water heater, for example, and the flow path for the refrigerant is provided. Heat exchange is performed between the flowing refrigerant and the water flowing in the water flow path.

  However, since a space is formed in the center of the tube formed by spirally piping the double pipe, there is a lot of wasted space, and the flow path length necessary for heat exchange is sufficient in the limited piping space. There was a problem that it was difficult to ensure.

  In addition, if a pipe with a flow path length that provides a predetermined heat exchange performance is bent and fitted so as to fit within a predetermined piping space, for example, a large curvature radius that does not cause damage such as bending or cracking. Must be bent at. As a result, there is a problem that the flow path length necessary for heat exchange cannot be secured and heat exchange efficiency is deteriorated.

JP 60-164183 A JP 2005-69620 A

  An object of the present invention is to provide a double pipe that can be piped so as to fit in a predetermined pipe space while ensuring a flow path length.

The present invention relates to a double pipe comprising an inner pipe having a first flow path formed therein and an outer pipe provided outside the inner pipe and having a second flow path formed between the inner pipe and the inner pipe. a is, the serpentine portion formed by meandering meandering direction double pipe, constituted by a plurality disposed in layers with respect to superposition direction meandering portion are overlapped with each other, the meandering portion, viewed A straight line portion in the length direction and a U-shaped bent portion in a plan view bent back to a predetermined radius of curvature, and each of the plurality of meandering portions folded in the meandering direction Arranged alternately in the middle of the meandering direction so that a part of each meandering part overlaps, and in order from one side of the meandering direction to have a three-row structure of an end row, a central row and an end row, a plurality of layers are arranged A plane orthogonal to the overlapping direction of one straight line portion of the end row among the meandering portions In each layer in each of the meandering portions arranged in parallel with each other at a predetermined interval with respect to the overlapping direction and arranged in layers, the other end row, the straight portion of the central row, and the bent portion At least one of them is inclined with respect to a plane perpendicular to the superimposing direction, and is piped at a predetermined interval with respect to the superimposing direction .

  For example, when a double pipe having a flow path length of 4 m is accommodated in a container having a width of 204 mm, a length of 440 mm, and a height of 61 mm, a plurality of meandering portions formed by meandering one double pipe are formed, Each meandering portion is accommodated in a container while being piped in layers. Thereby, it can accommodate in the container which has a predetermined piping space, ensuring the flow path length of a double pipe | tube.

  As a result, even if the double pipe is piped in a compact manner, the heat exchange performance is not lowered, and heat can be stably exchanged between the fluids flowing through the first flow path and the second fluid. In addition, since the pipe space of the double pipe is small, for example, a box-type container in which the double pipe is stored or a heat exchanger provided with the double pipe can be easily installed.

Further, each meandering section which is pre-Symbol plurality placement, by staggered as part of the respective meandering section folded the meandering direction overlap, a space is non-overlapping portions of each meander form Is done. For this reason, if the other portions of each meandering portion corresponding to the space are piped close to each other, the arrangement thickness in the overlapping direction can be reduced rather than the meandering direction of each meandering portion being folded back to each other. Can be thinned.
As a result, a double pipe having a predetermined flow path length can be compactly piped.

Also, the meandering portion of at least an end column of the respective meander portions of a plurality arranged in a layer form, by a parallel pipe child to the plane perpendicular to the superposed direction, the meandering portion of the above-mentioned end column, e.g. Since piping can be performed along a plane perpendicular to the overlapping direction of the inner wall surface or floor surface of the container, the piping posture of the entire double tube is stable, for example, rocking, rattling, etc. Can be prevented.

  In addition, the end row includes a row of meandering portions arranged on one end side of the layered meandering portion formed by arranging a plurality of meandering portions in a layered manner in the overlapping direction, and a row of meandering portions arranged on the other end side. Correspond.

The front SL more to pipes spaced at a predetermined interval with respect to the direction of superimposing the respective meander, a gap between the meander is formed, heat transfer between the meander is cut off . As a result, heat conduction can be prevented from occurring between the meandering portions, and the heat exchange efficiency can be improved.

  Moreover, as an aspect of the present invention, outer fins can be continuously formed in the spiral direction along the outer peripheral surface of the inner tube on the outer peripheral surface of the inner tube.

Further, as an aspect of the present invention, the outer surface fin can be constituted by a specially processed fin.
If the above-mentioned outer surface fin is composed of a specially processed fin, the outer surface area of the inner tube can be increased, and the refrigerant condensed on the fin surface can be smoothly separated.
As a result, the heat exchange efficiency can be further improved as compared with the normal fins.
The fluid can be composed of, for example, water or a refrigerant.

  According to this invention, it is possible to perform piping so as to fit within a predetermined piping space while ensuring the flow path length of the double pipe. As a result, even if the double pipe is piped in a compact manner, the heat exchange performance is not lowered, and heat can be stably exchanged between the fluids flowing through the first flow path and the second fluid.

The perspective view which shows the piping state of a double pipe. The front view and back view of a double pipe. The top view and bottom view of a double pipe. The right view and left view of a double pipe. FIG. 2 is an enlarged cross-sectional view of the double pipe shown in FIG. FIG. 6 is a cross-sectional view of the double pipe shown in FIG. The partial expansion expansion perspective view which shows the typical structure of the inner pipe from which fin height differs. The top view which shows the accommodation state of a double pipe in a container.

An embodiment of the present invention will be described in detail with reference to the drawings.
1 is a perspective view showing the piping state of the double pipe 1, FIGS. 2A and 2B are a front view and a rear view of the double pipe 1, and FIGS. 3A and 3B are double pipes 1. FIG. FIGS. 4A and 4B are a right side view and a left side view of the double pipe 1, respectively.

  The double pipe 1 of the present embodiment is a single copper pipe formed to have a predetermined flow path length, a copper inner pipe 2 provided concentrically around the pipe axis center, and the inner pipe 2 It is comprised with the copper outer tube | pipe 3 provided in the outer side.

  The double pipe 1 includes a first meandering part 6A, a second meandering part 6B, and a third meandering part formed by meandering the single double pipe 1 in a meandering direction E corresponding to the width direction. 6C and the 4th meander part 6D are arrange | positioned in layers with respect to the superimposition direction G (or up-down direction) mutually overlapped in order from the upper side, and the layered meander part 7A is comprised.

  A first flow path 4 for flowing water W as a first fluid is formed inside the inner pipe 2. Moreover, the 2nd flow path 5 for flowing the refrigerant | coolant R which is a 2nd fluid is formed between the inner tube | pipe 2 and the outer tube | pipe 3 (refer FIG. 5).

  One end of the inner pipe 2 is provided with an inflow port 2a through which water W supplied from a circulation type water supply source provided in an outdoor unit of the heat pump type floor heating is provided. Further, the other end of the inner pipe 2 is provided with an outlet 2b for flowing out the water W.

  One end of the outer pipe 3 is provided with an inlet 3a through which a refrigerant R supplied from a circulating refrigerant supply source provided in the outdoor unit described above is introduced via a connecting pipe 3c. The other end of the outer tube 3 is provided with an outlet 3b for flowing out the refrigerant R through the connecting tube 3c.

The inlet 2 a of the inner pipe 2 and the outlet 3 b of the outer pipe 3 are provided on one end side 1 a of the double pipe 1. Further, the outlet 2 b of the inner pipe 2 and the inlet 3 a of the outer pipe 3 are provided on the other end 1 b of the double pipe 1.
The inflow port 2a and the outflow port 2b of the inner tube 2 are provided toward the tube axis direction D1 with respect to the one end side 1a and the other end side 1b of the double tube 1.

The inflow port 3a of the outer tube 3 is provided perpendicular to the one end side 1a of the double tube 1 perpendicular to the tube axis direction D1. Further, the outlet 3b of the outer tube 3 is provided horizontally with respect to the other end side 1b of the double tube 1 perpendicular to the tube axis direction D1.
In addition, the one end side 1a and the other end side 1b of the double pipe 1 are provided up and down in the same direction (see (a) of FIG. 2 and (a) of FIG. 3).

Next, the piping structure of the meandering parts 6A to 6D will be described in detail with reference to FIGS.
The meandering portion 6A includes straight straight portions 6Aa and 6Ac extending straight and planar U-shaped bent portions 6Ab and 6Ad bent to a predetermined radius of curvature.

  One end side 1a of the double pipe 1 is connected to the upstream side of the straight portion 6Aa, the bent portion 6Ab is connected to the downstream side of the straight portion 6Aa in the meandering direction E, and downstream of the bent portion 6Ab. The straight part 6Ac is folded back in the length direction F and continuously provided, and the bent part 6Ad is continuously provided in the meandering direction E on the downstream side of the straight part 6Ac. That is, the meandering portion 6A is piped in the meandering direction E.

The meandering part 6B is composed of straight straight line parts 6Ba and 6Bc extending straight and planarly U-shaped bent parts 6Bb and 6Bd bent to a predetermined radius of curvature.
The straight portion 6Ba is continuously provided in the length direction F on the downstream side of the above-described bent portion 6Ad, and the bent portion 6Bb is continuously provided in the meandering direction E on the downstream side of the straight portion 6Ba. The straight portion 6Bc is folded back in the length direction F and provided downstream, and the bent portion 6Bd is folded back in the meandering direction E and provided downstream from the straight portion 6Bc. That is, the meandering portion 6B is piped in the meandering direction E.

  Further, the straight portions 6Ba and 6Bc are inclined so as to become lower from the upstream side toward the downstream side, and the straight portion 6Bc is folded back in the length direction F and piped downward along the above-described straight portion 6Ac.

The meandering portion 6C is composed of straight straight portions 6Ca and 6Cc extending straight and planarly U-shaped bent portions 6Cb and 6Cd bent at a predetermined radius of curvature.
The straight portion 6Ca is continuously provided in the length direction F on the downstream side of the bent portion 6Bd, and the bent portion 6Cb is provided in the meandering direction E on the downstream side of the straight portion 6Ca. The straight portion 6Cc is folded back in the length direction F and connected to the downstream side, and the bent portion 6Cd is connected to the meandering direction E on the downstream side of the straight portion 6Cc. That is, the meandering portion 6C is folded back in the meandering direction E and piped below the meandering portion 6A.

  The straight portion 6Ca is piped downward along the straight portion 6Aa, the bent portion 6Cb is piped downward along the bent portion 6Ab, and the straight portion 6Cc is along the straight portion 6Bc. It inclines so that it may become low toward the downstream from the upstream.

  The meandering portion 6D is composed of straight linear portions 6Da and 6Dc that extend straight and have a U-shaped bent portion 6Db that is bent to a predetermined radius of curvature. Further, the straight portions 6Da and 6Dc and the bent portion 6Db of the meandering portion 6D are piped in parallel to a flat inner wall surface perpendicular to the overlapping direction G formed inside the container 10 described later.

The straight portion 6Da is continuously provided in the length direction F on the downstream side of the above-described bent portion 6Cd, and the bent portion 6Db is folded in the meandering direction E on the downstream side of the straight portion 6Da. A straight line portion 6Dc is folded back in the length direction F and continuously provided on the downstream side.
That is, the meandering portion 6D is folded back in the meandering direction E and piped across the lower side of the meandering portions 6B and 6C. In addition, the other end side 1b of the double pipe 1 is connected to the downstream side of the straight line portion 6Dc.

  Further, the straight portion 6Da is piped downward along the straight portion 6Ba described above, the bent portion 6Db is folded back in the meandering direction E and is piped below the bent portions 6Bb and 6Cb, and the straight portion 6Dc is described above. It is piping down along the straight part 6Ca.

  The straight portions 6Aa, 6Ac, the straight portions 6Ba, 6Bc, the straight portions 6Ca, 6Cc, and the straight portions 6Da, 6Dc are formed to have substantially the same length, and are piped in parallel with the length direction F.

  The bent portions 6Ab, 6Ad, the bent portions 6Bb, 6Bd, and the bent portions 6Cb, 6Cd are bent to substantially the same radius of curvature, but the bent portion 6Db has a size or a radius of curvature across the bent portions 6Bb, 6Cb. Is bent.

The meandering parts 6A to 6C having the above-described piping structure are alternately arranged such that a part of the meandering parts 6A to 6C overlaps at the center in the meandering direction E (see FIG. 4).
That is, since a space is formed in a portion where the meandering portions 6A to 6D do not overlap, if other portions of the meandering portions 6A to 6D corresponding to the space are piped close to each other, the meandering portions 6A to 6D are connected to each other. The arrangement thickness in the superposition direction G can be made thinner than the arrangement in the superposition.
As a result, the double pipe 1 having a predetermined flow path length can be compactly piped.

Further, the meandering parts 6A to 6D are piped at a predetermined interval with respect to the overlapping direction G described above. That is, since a gap is formed between the meandering parts 6A to 6D, heat transfer between the meandering parts 6A to 6D piped up and down is blocked by the gap.
As a result, heat conduction can be prevented from occurring between the meandering portions 6A to 6D, and the heat exchange efficiency can be improved.

  The above-described double pipe 1 causes the water W supplied from a water supply source (not shown) to flow along the first flow path 4 from the inlet 2a to the outlet 2b of the inner pipe 2 to supply a refrigerant (not shown). The refrigerant R supplied from the source is caused to flow along the second flow path 5 from the inlet 3a of the outer tube 3 toward the outlet 3b.

  As a result, heat exchange is performed via the inner pipe 2 while flowing the water W flowing through the first flow path 4 and the refrigerant R flowing through the second flow path 5 in opposite directions. For example, the heat of the refrigerant R is conducted to the water W to produce hot water.

Next, the fin structure formed in the inner tube 2 will be described in detail with reference to FIGS.
5 is an enlarged sectional view taken along line AA of the double tube 1 shown in FIG. 1, FIG. 6 is a sectional view taken along line BB of the double tube 1 shown in FIG. 5, and FIG. FIG. 3 is a partially enlarged developed perspective view showing a schematic structure of a different inner tube 2.

  On the outer peripheral surface of the inner tube 2, outer surface fins 12 are continuously formed in the spiral direction D <b> 2 along the outer peripheral surface of the inner tube 2. Further, a concave main groove 13 is continuously formed between the outer fins 12 along the outer fin 12 in the spiral direction D2.

More specifically, the outer fin 12 is inclined at an angle (β ₁ ) with respect to the tube axis direction D1. Furthermore, the number of fins is 35, the fin height (H ₁ ) of the reference outer surface fin 12 is 1.00 mm, and the shape of the outer surface fin 12 is formed in a trapezoidal cross section (see part a in FIG. 6).

A concave sub-groove 14 is formed in the spiral direction D3 at the top of the outer fin 12 so as to intersect the spiral direction D2. The sub-groove 14 is inclined at an angle (β ₂ ) with respect to the tube axis direction D1.

Concave portions 15 that are spaced apart from each other are formed on both side walls of the outer fin 12 that face the main groove 13. In addition, a large number of the recesses 15 are arranged along the both side wall surfaces of the outer fin 12 at equal intervals in the spiral direction D2.
A protruding piece 16 that protrudes toward the main groove 13 is formed on the outer peripheral side edge of the recess 15 so as to be orthogonal to the wall surface of the outer fin 12.

On the inner peripheral surface of the inner tube 2, inner fins 17 are continuously formed along the inner peripheral surface of the inner tube 2 in a spiral direction D 4 opposite to the spiral direction D 3. Further, the fin height (H ₂ ) of the inner fin 17 is lower than the fin height (H ₁ ) of the outer fin 12, and the fin shape is formed in a trapezoidal cross section.
A constant fluid stirring action can be repeatedly applied to the fluid (water W) flowing along the first flow path 4 of the inner pipe 2 described above over the entire length of the double pipe 1.

  According to the above-described fin structure, a part of the refrigerant R flowing along the main groove 13 between the outer fins 12 collides with the projecting piece 16 and is scooped up in the tube radial direction. An effect of generating a steady flow, that is, a turbulent flow can be obtained.

  Therefore, compared to a conventional heat transfer tube in which fins are formed on the outer peripheral surface of the tube, it is possible to promote turbulent flow including the inner side in the tube radial direction and reduce the thickness of the refrigerant R, thereby obtaining an excellent heat transfer coefficient. be able to.

Next, a piping method for piping the double pipe 1 so as to fit in a predetermined piping space will be described.
For example, as shown in FIG. 8, when the double pipe 1 having a flow path length of 4 m is accommodated in a container 10 formed with a width of 204 mm, a length of 440 mm, and a height of 61 mm, one double pipe 1 is Serpentine portions 6A to 6D are formed by meandering and folding in the meandering direction E.

  After the meandering parts 6A to 6D are arranged in layers from the upper side in the overlapping direction G to form the layered meandering part 7A, the meandering parts 6A to 6D of the layered meandering part 7A are accommodated in the container 10 while being arranged in layers. To do. Further, the one end side 1 a and the other end side 1 b of the double pipe 1 protrude in parallel toward the outside from the outer corner wall surface of the container 10.

  Thereby, it can accommodate in the container 10 which has a predetermined piping space, ensuring the flow path length of the double pipe 1. FIG.

  As a result, even if the double pipe 1 is piped in a compact manner, the heat exchange performance is not lowered, and the water W flowing through the first flow path 4 and the refrigerant R flowing through the second fluid 5 are stabilized. Heat exchange. In addition, since the piping space of the double pipe 1 is small, for example, a box-type container in which the double pipe 1 is housed or a heat exchanger provided with the double pipe 1 can be downsized. it can.

  In addition, if the meandering portion 6D is accommodated by pressing substantially evenly against the flat inner wall surface of the container 10, almost the entire serpentine portion 6D is piped along the flat inner wall surface. The piping posture is stable, and it is possible to prevent, for example, rocking and rattling.

In the correspondence between the configuration of the present invention and the embodiment,
The fluid of the present invention corresponds to water W and refrigerant R,
The present invention is not limited to the configuration of the above-described embodiment, but can be applied based on the technical idea shown in the claims, and many embodiments can be obtained.

  For example, a support member may be attached between the meandering parts 6A to 6D formed by meandering the double pipe 1, and the meandering parts 6A to 6D may be supported at a predetermined interval. Thereby, meandering parts 6A-6D can be prevented from contacting or colliding with each other.

  Alternatively, the meandering portions 6A to 6D may be brought into contact with each other and may be piped in layers, and the meandering portions 6A to 6D can be piped without a gap, so that the thickness of the layered meandering portion 7A is the same as the gap. Can be made thinner.

E ... Meander direction F ... Length direction G ... Overlapping direction W ... Water R ... Refrigerant 1 ... Double pipe 2 ... Inner pipe 3 ... Outer pipe 2a, 3a ... Inlet 2b, 3b ... Outlet 4 ... First flow Path 5 ... Second flow path 6A to 6D ... Meandering part 7A ... Layered meandering part 12 ... Outer surface fin 13 ... Main groove 14 ... Sub groove 15 ... Recess 16 ... Projection piece 17 ... Inner surface fin

Claims (3)

A double pipe comprising an inner pipe having a first flow path formed therein and an outer pipe provided outside the inner pipe and having a second flow path formed between the inner pipe and the inner pipe;
A plurality of meandering portions formed by meandering the double pipes in a meandering direction, arranged in a layered manner in the overlapping direction in which the meandering portions are superimposed on each other;
The meandering portion is composed of a linear portion in the length direction that is linear in a plan view and a bent portion in a U shape that is bent in a predetermined curvature radius and folded back.
The plurality of arranged meandering portions are alternately arranged at the center of the meandering direction so that a part of each meandering portion is overlapped by folding back the meandering direction. With a three-row structure of rows and end rows,
The straight line portion of one of the end rows among the plurality of meandering portions arranged in a layer shape is parallel to the plane orthogonal to the overlapping direction and is piped at a predetermined interval with respect to the overlapping direction,
In each layer in each of the meandering portions arranged in a plurality of layers, at least one of the straight line portion of the other end row and the central row, and the bent portion is inclined with respect to a plane orthogonal to the overlapping direction, and A double pipe that is piped at a predetermined interval in the overlapping direction . The double pipe according to claim 1, wherein outer surface fins are continuously formed in the spiral direction along the outer peripheral surface of the inner pipe on the outer peripheral surface of the inner pipe. The double pipe according to claim 2 , wherein the outer fin is configured by a specially processed fin.

Images