JP2015215100A - Heat exchanging pipe, heat exchanger using heat exchanging pipe and heat exchanging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent inner and outer media (water (a) and refrigerant (b)) of an inner pipe 10 from being mixed to each other, enable its leakage to be detected and attain a high heat exchanging efficiency.SOLUTION: This invention relates to a heat exchanger A comprising an inner pipe 10 for passing refrigerant (b) and an outer pipe 20 arranged outside the inner pipe so as to pass water (a) between it and the inner pipe. The inner pipe 10 comprises a plurality of corrugate pipes 11 arranged side by side and the inner pipe 10 is covered by a protection pipe 13. The protection pipe is closely contacted with the outer surface of the inner pipe to form, at its outer surface, irregularities 14. Between the inner pipe and the protection pipe is produced a space communicating with both pipe ends. The space becomes a leakage detecting groove to prevent media inside or outside of the inner pipe from being mixed to each other and cause the leakage to be detected. In addition, since the protection pipe enters the grooves 12 of the inner pipe to cause both pipes to be integrally assembled, a high thermal conductivity is attained and water becomes a turbulent flow by the irregularities 14, so that a high heat exchanging efficiency can be attained.

Description

  The present invention relates to a heat exchange pipe for performing heat exchange between a heat exchange medium of different qualities (characteristics) and a heat exchange medium, a heat exchanger comprising the heat exchange pipe, and a heat exchange apparatus comprising the heat exchanger. Is.

  For example, as a hot water supply apparatus, a hot water supply comprising a compressor, a hot water supply heat exchanger, an expansion valve, and a heat source side heat exchanger using outside air as a heat source, a hot water supply heat exchanger, a water supply pump, and a hot water supply tank. Some are composed of cycles. This hot water supply device is a hot water supply heat exchanger that heats water from a water supply pump with hot refrigerant from a compressor to form hot water, stores this hot water in a hot water supply tank, and supplies it to a kitchen, a hot water bath, etc. (Patent Literature) 1, paragraph 0002, FIG. 6).

The hot water supply heat exchanger generally has a double-pipe structure composed of an inner pipe and an outer pipe. A refrigerant such as carbon dioxide gas is circulated through one pipe, and water is circulated through the other pipe. The heat exchange medium and the heat exchange medium of different qualities are circulated through the inner and outer tubes to exchange heat (Patent Document 1, paragraph 0003).
In this heat exchanger, since different heat exchange media (fluids) are circulated in the inner and outer pipes, for example, there is one in which the inner pipe is a double pipe and a leak detection groove is formed in the peripheral length direction therebetween. This leakage detection groove is used to prevent the leakage of the medium in the inner pipe due to damage to the inner pipe, for example, the refrigerant leaking to the outer surface of the inner pipe due to damage to the inner pipe. The medium is prevented from mixing and the leakage is detected (Patent Document 1, Paragraph 0006).

  Moreover, the same quality, for example, as a heat exchanger of water and warm water, there is one in which flat corrugated pipes are arranged in parallel, and the parallel corrugated pipe is used as an inner pipe and an outer cylinder (outer pipe) is fitted on the outer peripheral surface thereof ( (See Patent Document 2 and FIGS. 5 to 8).

JP 2005-9832 A JP 2012-2495 A

The heat exchanger of Patent Document 1 has a circular cross section, and the medium flowing through the central portion of the cylindrical inner tube has a long (far) distance from the medium flowing through the outer peripheral surface of the inner tube. Is low.
On the other hand, the heat exchanger of Patent Document 2 has corrugated tubes arranged in parallel, and the corrugated tubes are thin (small diameter). For this reason, compared with the inner pipe having a circular cross section, if the flow rate is the same, the distance between the medium flowing in each corrugated pipe and the medium flowing on the outer peripheral surface thereof is short (the contact area is large), and the heat exchange rate is also high. .
However, when this heat exchanger composed of parallel corrugated tubes is used for heat exchange between a heat exchange medium of different quality and a heat exchange medium, if the corrugated tube breaks, the media inside and outside the tube will mix. End up.

  This invention makes it a subject to make it possible to use the heat exchanger of patent document 2 for the heat exchange of a heat exchange medium of different quality, and a heat exchange medium under the above actual condition.

In order to achieve the above object, the present invention covers the parallel corrugated tubes with a protective tube, and the protective tube is a heat exchange tube in close contact with the corrugated tube.
In this way, a gap is formed between the parallel corrugated pipes and between the protective pipes, leading to both pipe ends, and the gap is equivalent to the leakage detection groove, so that the inside and outside of the heat exchange pipe It is possible to prevent the medium from being mixed and to detect the leakage.
In addition, if the protective tube is closely attached to the corrugated tube and enters the groove of the corrugated tube, the integrity of the protective tube and the corrugated tube is ensured, and the thermal conductivity of the corrugated tube inner surface and the outer surface of the protective tube is increased, Unevenness following the corrugated tube outer surface is generated on the surface of the protective tube, and the fluid flowing on the surface becomes turbulent due to the unevenness, so that the heat exchange rate is high.

The heat exchange pipe according to the present invention has a heat exchange medium or a heat exchange medium having different qualities inside and heat exchange between the medium and the external heat exchange medium or heat exchange medium. In the exchange pipe, a plurality of corrugated pipes are arranged in parallel, and the parallel corrugated pipes are covered with a protective pipe, and the protective pipes are in close contact with the outer surface of each corrugated pipe, and the outer face of the protective pipe is also on the outer face of the corrugated pipe. It is possible to adopt a configuration in which the shape is concave and convex.
The heat exchange tube is loaded into the outer tube, and either the heat exchange medium or the heat exchange medium is placed in the heat exchange tube, and the other of the heat exchange medium or the heat exchange medium is placed between the heat exchange tube and the outer tube. It can be distributed and used as a heat exchanger.
Also, the heat exchangers are arranged in parallel, and one end of the heat exchanger located on one side of each of the parallel heat exchangers is used as one supply / discharge head, and one end of the heat exchanger located on the other side is used. The other heat supply head is a heat exchange device having a structure in which the heat exchange pipe of each adjacent heat exchanger is a continuous pipe in which the end of one heat exchanger is bent to the end of the other heat exchanger. Can do.

  Since the present invention is configured as described above, it is possible to prevent the medium inside and outside the heat exchange tube from mixing and to detect the leakage thereof, and to achieve a high heat exchange rate.

The perspective view of one Embodiment of the heat exchange apparatus which concerns on this invention Plan view of the same embodiment Sectional view of the heat exchanger of the same embodiment A part of the heat exchanger is shown, (a) is an exploded perspective view, (b) is an exploded cut plan view, and (c) is a cut front view. The inner pipe (heat exchange pipe) of the heat exchanger is shown, (a) is a partial perspective view, (c) is a partial plan view, (c) is a partial front view, and (d) is a partial rear view. 5A is a cross-sectional view taken along line II in FIG. 5B, FIG. 5B is a cross-sectional view taken along line II-II in FIG. 5B, and FIG. 5C is a cross-sectional view taken along line III-III in FIG. d) is a partial sectional view of FIG. Partial perspective view of the corrugated pipe of the inner pipe

  1 to 7 show an embodiment of a heat exchange device according to the present invention. The heat exchange device of this embodiment is used as a heat exchanger for hot water supply of the hot water supply device, and has a plurality of heat exchanges. This is a combination of vessel A. The heat exchanger A is disposed between the heat exchange pipe serving as the inner pipe 10 through which a heat exchange medium (refrigerant b) such as carbon dioxide gas passes and the inner pipe 10 to exchange heat with the inner pipe 10. And an outer tube 20 through which water a as a medium passes.

  The inner pipe (heat exchange pipe) 10 is a main body in which a plurality of corrugated pipes 11 made of a metal having high thermal conductivity are arranged in parallel, and the corrugated pipe 11 has an outer periphery excluding both ends as shown in FIG. A corrugated groove 12 is formed on the surface. The corrugated groove 12 may be continuous or intermittent, such as a spiral, or may be formed by forming circular grooves having the same outer periphery at a required interval in the length direction. The parallel number of the corrugated pipes 11 is arbitrary, and in this embodiment, it is four.

As shown in FIGS. 5 and 6, the parallel corrugated tubes 11 are covered with a protective tube 13 made of the same material as the corrugated tube 11 over the entire outer peripheral surface except for both ends thereof, so that heat exchange tubes (inner tubes) ) 10. The covering of the protective tube 13 to the corrugated tube 11 is in close contact.
At this time, as shown in FIGS. 6 (c) and 6 (d), the protective tube 13 enters the groove 12 of the corrugated tube 11, and a wavy unevenness 14 is generated on the surface thereof. Property (adhesion) is ensured and the inner surface of the corrugated tube 11 and the outer surface of the protective tube 13 are increased in thermal conductivity, and the irregularity 14 on the surface of the protective tube 13 disturbs the fluid (water) a flowing on the surface. As a result, the heat exchange rate is high.

  The portion of the inner tube 10 having the projections and depressions 14 is a novel design as a heat exchange tube, and the heat exchange tube 10 has a portion having the projections and depressions 14 having an appropriate length and is provided at both ends thereof. Appropriately provided with an inlet plug (supply / discharge head) or an outlet plug (supply / discharge head), which is linear, curved or curved, and curved several times (Fig. 1 and FIG. 2).

  The outer tube 20 is made of a highly heat-insulating material and may be a metal or a resin. In this embodiment, the outer tube 20 is an integrally molded product using a thermoplastic resin. As shown in FIG. 4, the outer pipe 20 has reinforcing ribs 21 formed vertically and horizontally on the outer peripheral surface thereof, and the inside thereof is a space in which circular spaces are arranged (skew dumpling shape) (FIG. 3). The inner tube 10 is inserted into this space. As shown in FIG. 3, a gap (gap) 22 is formed between the inner peripheral surface of the outer tube 20 and the outer peripheral surface of the inner tube 10 (protective tube 13). The unevenness 14 of the protective tube 13 is intermittently present in the length direction.

  One end of the outer tube 20 is a male part 23 and the other is a female part 24. The male part 23 is interposed in the female part 24 with a packing 25 and fastened with screws 26, so that the required number of outer pipes 20 are obtained. Can be connected (see FIGS. 1, 2, and 4). Although two are connected in this embodiment, it can be set as the heat exchanger A of arbitrary length by stopping the connection or making it the arbitrary number of connections.

  In order to obtain a heat exchange apparatus having a compact required capacity by this heat exchanger A, an inner tube 10 having a straight required length is prepared, an outer tube 20 is inserted from one end thereof, and the protruding inner tube 10 is attached to the inner tube 10. It folds in an arc shape and runs along the outer tube 20. Next, the outer tube 20 is newly inserted into the aligned inner tube 10, and the protruding inner tube 10 is folded back into an arc shape so as to be along the outer tube 20. Thereafter, similarly, the required number of stages of heat exchangers A are in parallel (see FIGS. 1 and 2). In this embodiment, there are four rows (four stages). At the time of this parallel, the inner pipe 10 has a length corresponding to the number of rows, and both ends of the inner pipe 10 are combined with the corrugated pipes 11 and the inlet plug (supply / discharge head) 27a or outlet plug (supply / discharge head) of the high-temperature refrigerant b 27b is provided.

  A cap 28 made of the same material as that of the outer tube 20 is fitted into the folded portion of the inner tube 10 in parallel with the heat exchanger A. The cap 28 can be a cylinder with both ends open, or a covered cylinder with one end face closed. In the former cylindrical shape, water a enters the outer tube 20 from the left or right of the heat exchange device and flows out from the right or left (see arrow a in FIG. 1), and the latter is a covered cylindrical shape. Then, water a enters the outer tube 20 from the side of the one plug 27a or 27b, meanders so as to flow from the end of the one outer tube 20 in parallel to the other end of the other outer tube 20, and the other plug 27b or 27a. The flow comes out from the side (see arrow a in FIG. 2). In any case, the flow direction of the refrigerant b and the water a flowing in the inner pipe 10 is made to be as opposite as possible.

  The heat exchange device of this embodiment has the above-described configuration, and when this heat exchange device is a hot water supply heat exchanger of the hot water supply device, the high-temperature refrigerant b from the compressor circulates in the inner pipe 10 and is supplied from the water supply pump. Water a flows through the gap 22 in the outer tube 20. At this time, the protective tube 13 is integrated with the inner tube 10 to have high thermal conductivity between them, and the inner peripheral surface of the outer tube 20 and the outer peripheral surface of the inner tube 10 (protective tube 13). Since the water a flowing through the irregularities 14 of the protective tube 13 in the gap 22 between them becomes a turbulent flow, heat exchange between the high-temperature refrigerant b and the water a in the inner tube 10 is performed smoothly.

  The corrugated tube 11 and the protective tube 13 are damaged by providing a leak detection line in the gap between the corrugated tube 11 and the protective tube 13 or by providing a leak detector at one end in the length direction of the gap. If the liquid leaks into the gap, the liquid leakage can be detected.

The above embodiment is a case of heat exchange between the water a and the refrigerant b, but the present invention is adopted in any aspect as long as heat exchange is performed between the heat exchange medium and the heat exchange medium having different qualities. Of course you can. Moreover, the corrugated pipe | tube 11 can be made into a flat tube even if it is not a circular pipe (circular pipe) (refer patent document 2 FIGS. 5-7). Furthermore, a heat exchange medium (for example, water a) can be circulated through the inner pipe 10 and a heat exchange medium (for example, refrigerant b) can be circulated between the inner and outer pipes.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 Inner pipe | tube 11 Corrugated pipe | tube 12 The groove | channel 13 of the corrugated pipe surface 13 Protective pipe 14 The unevenness | corrugation 20 of the protective pipe surface Outer pipe | tube 21 Rib 22 Gap | interval A Heat exchanger a Water (heat exchange medium)
b Refrigerant (heat exchange medium)

Claims (3)

The heat exchange medium (b) or the heat exchange medium (a) of different quality is circulated inside, and the medium (a, b) and the external heat exchange medium (a) or heat exchange medium (b) A heat exchange pipe (10) for performing heat exchange,
A plurality of corrugated pipes (11) are arranged in parallel, the parallel corrugated pipes (11) are covered with a protective pipe (13), and the protective pipes (13) are in close contact with the outer surface of each corrugated pipe (11). The heat exchange tube is characterized in that the outer surface of the protective tube (13) is also uneven (14) following the outer surface of the corrugated tube (11).   The heat exchange pipe (10) according to claim 1 is loaded in the outer pipe (20), and one of the heat exchange medium (b) and the heat exchange medium (a) is placed in the heat exchange pipe (10). A heat exchanger in which the other of the heat exchange medium (b) or the heat exchange medium (a) is circulated between the heat exchange pipe (10) and the outer pipe (20).   A plurality of heat exchangers (A) according to claim 2 are arranged in parallel, and one end of the heat exchanger (A) located on one side of each of the parallel heat exchangers (A) is connected to one supply / discharge head. (27a), one end of the heat exchanger located on the other side is the other supply / discharge head (27b), and the heat exchange pipe (10) of each adjacent heat exchanger (A) is one heat exchanger. A heat exchange device characterized in that the end of (A) is a continuous tube bent to the end of the other heat exchanger (A).