JP3945492B2 - Heat exchange device and heat pump water heater using the same - Google Patents

Description

  The present invention relates to a heat exchange device for exchanging heat between a first fluid and a second fluid, and a heat pump hot water supply device using the heat exchange device.

As a conventional heat exchange device for exchanging heat between the first fluid and the second fluid, for example, as shown in FIG. 13, the core tube 1 constituting the water passage W and the outer periphery of the core tube 1 are spirally wound. In the heat exchange device in which the water flowing through the water passage W is heated by the refrigerant flowing through the refrigerant passage, the core tube 1 is wound in a spiral shape, and the upper and lower two stages ( In other words, the two are overlapped and connected. In this way, the upper core tube 1 and the lower core tube 1 are connected via the connecting portion 3 at the center of the spiral, and the wound tube 2 wound around the outer periphery of the upper core tube 1 and the lower core The thing of the structure connected with the winding tube 2 currently wound around the outer periphery of the pipe | tube 1 via the connection part 4 in the center side of a spiral is known (for example, refer patent document 1).
Japanese Patent Laid-Open No. 2003-97898 (pages 1-9, FIGS. 11 and 13)

  However, in the above-described conventional heat exchange device, the method of stacking spiral core tubes in two stages is compact and can greatly improve the performance of the heat exchanger, but water flowing through the core tube and refrigerant flowing through the coil tube In order to efficiently perform heat exchange with the tube, it is necessary to perform means for bringing the winding tube and the core tube into thermal contact, for example, brazing. If the brazing process is performed, the winding tube and the core tube are integrated, so when the core tube is swirled, the expansion and contraction of the core tube is restricted and workability is reduced, and the spiral shape and bending radius of the core tube are restricted. There is a problem. In addition, since the winding tube is wound around the outer periphery of the core tube, the outer periphery of the core tube is not a continuous smooth curved surface, so that there is a problem that a dedicated bending jig is required and the processing cost increases. In addition, if only the winding tube is wound around the core tube without brazing or the like, to make the core tube spiral, special tools are required to regulate the winding tube so that it does not move. There was also a problem that the process became complicated and the cost increased.

Accordingly, the present invention solves the above-described conventional problems, and the first heat transfer tube including the second heat transfer tube configured by spirally twisting a plurality of heat transfer tubes is laminated in a plane spiral shape on a plurality of planes. An object of the present invention is to provide a low-cost and compact heat exchange device with good heat exchange performance.

In order to solve the above problems, a heat exchange device according to the present invention includes a first heat transfer tube through which a first fluid flows and a plurality of heat transfer tubes that are arranged in the first heat transfer tube and through which a second fluid flows. The first heat transfer tube is housed in a plane spiral on the first plane and then laminated in a plurality of planes so as to be housed in a plane spiral on the second plane. In addition, the first heat transfer tube has a constant bending radius with the same tube diameter .

According to this, the 1st heat exchanger tube which encloses the 2nd heat exchanger tube constituted by twisting several heat exchanger tubes spirally is compact, low cost with good heat exchange performance laminated in a plane spiral shape in a plurality of planes A heat exchanging device can be provided , and the number of bending jigs such as pipe benders can be minimized by setting the first heat transfer tubes having the same diameter to the same bending radius. It is possible to improve the processing cost.

In addition, a heat pump hot water supply device that includes a compressor, a radiator, a decompressor, a heat absorber, etc., and has a refrigerant pressure equal to or higher than a critical pressure, and the second fluid refrigerant is a first radiator using the heat exchange device as a radiator . A heat pump water heater that heats one fluid is used.

  According to this, high cycle performance efficiency can be realized by using the second fluid flowing through the second heat transfer tube as a refrigerant in a heat pump cycle at a critical pressure or higher and heating the first fluid using the heat radiation of the refrigerant. .

  According to the present invention, the first heat transfer tube including the second heat transfer tube formed by spirally twisting several heat transfer tubes is stacked in a plane spiral shape on a plurality of planes and has a compact and low heat exchange performance. A cost heat exchange device can be provided.

  Moreover, high cycle performance efficiency is realizable by making the 2nd fluid which flows through a 2nd heat exchanger tube into the refrigerant | coolant of the heat pump cycle more than critical pressure, and heating a 1st fluid using the thermal radiation of the refrigerant | coolant.

The first invention includes a first heat transfer tube through which the first fluid flows, and a second heat transfer tube arranged in the first heat transfer tube and configured by twisting a plurality of heat transfer tubes through which the second fluid flows. The first heat transfer tube is housed in a plane spiral shape on the first plane and then stacked on a plurality of planes so as to be housed in a plane spiral shape on the second plane , and the first heat transfer tube Constitutes a heat exchange device in which the bending radius of the same tube diameter is constant .

According to this embodiment , by arranging a plurality of second heat transfer tubes twisted in a spiral in the first heat transfer tube, naturally between the first heat transfer tube and the plurality of second heat transfer tubes. Since the spiral first fluid flow path is formed and the second fluid is also swirled spirally, both the first fluid and the second fluid are turbulent and the first fluid flowing through the first heat transfer tube Heat exchange with the second fluid flowing through the second heat transfer tube can be efficiently performed, and a heat exchange device with good heat exchange performance can be obtained.

Thus, by twisting the second heat transfer tube in a spiral shape, there is no need to braze, etc., and the entire surface of the second heat transfer tube contributes as the heat transfer area, and the second fluid and the first fluid With a swirl flow, the heat transfer coefficient can be improved by the effect of turbulent flow disturbance, and a low-cost heat exchange device can be obtained. In addition, because the second heat transfer tube is arranged in the first heat transfer tube, the surface of the first heat transfer tube is a continuous smooth curved surface, so there is no need for special jigs and equipment, etc. Can reduce the processing cost and capital investment.

Further, the second heat transfer tube is twisted in a spiral shape while the tubes are in close contact with each other, and is disposed in the first heat transfer tube, so that when bending the first heat transfer tube, the first heat transfer tube is bent with a smaller bending radius. Since it can be bent, a highly compact heat exchanger can be provided.

As described above, the first heat transfer tube containing the second heat transfer tube twisted in a spiral shape is stored in a plane spiral shape on the first plane, and then stored in a plane spiral shape on the second plane. The first heat transfer tubes can be accommodated at a high density by laminating at, so that a compact low-cost heat exchange device with good heat exchange performance can be provided.

In addition, the number of bending jigs such as pipe benders can be minimized by setting the first heat transfer tubes of the same tube diameter to the same bending radius, improving continuous workability and reducing processing costs. can do.

  According to a second aspect of the present invention, in particular, in the heat exchange device according to the first aspect, the second heat transfer tube extends over the entire length, is seamless, and is constituted by a single piece. According to the present embodiment, since the second heat transfer tube contained in the first heat transfer tube and disposed in the swirl flow path of the first fluid is seamless, the second heat transfer is in contact with the first fluid. The corrosion resistance to the first fluid and the reliability of the entire heat exchange device can be improved only by the surface of the heat pipe. In addition, since the second heat transfer tube is seamless and is a single tube, the efficiency of the operation of twisting in a spiral shape is improved, and the connection operation is not required, so that the workability can be improved.

  In particular, according to a third aspect of the present invention, in the heat exchange device of the first or second aspect, a planar spiral first heat transfer tube located on the first plane, and a planar spiral first heat transfer tube located on the second plane, Have different tube diameters. According to the present embodiment, for example, the tube diameter of the first heat transfer tube located on the second plane is positioned on the second plane by making it larger than the tube diameter of the first heat transfer tube located on the first plane. In the first heat transfer tube portion, since the cross-sectional area through which the first fluid flows can be increased, it is possible to provide a heat exchange device with good safety and durability in consideration of blockage due to scale deposition of the first fluid. it can. In addition, the first heat transfer tubes with different tube diameters are positioned on the first plane and the second plane, respectively, and the first heat transfer tubes with the same tube diameter are swirled in the same plane so that the same tube diameter is the same plane. Therefore, it is possible to realize a more compact storage property, simplify production management, and improve work efficiency.

  In a fourth aspect of the present invention, in particular, in the heat exchange device according to any one of the first to third aspects, the first heat transfer tube located on the same plane has a large-diameter tube stage and a small-diameter tube stage having different tube diameters. That is. According to the present embodiment, since the large pipe stage and the small pipe stage can be mixed in the same plane, the ratio ratio of the large pipe stage and the small pipe stage is adjusted according to the required application. Therefore, it is possible to provide an optimum heat exchanging device corresponding to a wider range of applications. Also, in the same plane spiral, the large pipe stage can be more straight piped by arranging the large pipe stage on the outer peripheral side and the small pipe stage on the inner peripheral side. It is possible to provide a heat exchange device that is resistant to precipitation.

The fifth aspect of the invention is particularly the heat exchange device according to any one of the first to fourth aspects, wherein the bending radius of the portion of the first heat transfer tube having the large tube diameter is that of the portion of the first heat transfer tube having the small tube diameter. It is larger than the bending radius. According to the present embodiment, in the first heat transfer tube portion having a large tube diameter, it is easy to bend by increasing the bend radius, and the flow of the first fluid in the first heat transfer tube is made smooth and abrupt. It is possible to reduce sedimentation of scale due to bending or stagnation.

In a sixth aspect of the present invention, in particular, in the heat exchange device according to any one of the first to fifth aspects, the first spiral heat transfer tube of the first plane and the second plane is arranged in a direction perpendicular to the plane. The fixing means is provided so as to have a height substantially corresponding to the tube diameter. According to the present embodiment, the heat exchanging device is provided with the fixing means so as to have a height substantially corresponding to the tube diameter of the first heat transfer tube, thereby being perpendicular to the plane generated when the first heat transfer tube is swirled in a plane. The spring back force in the direction can be suppressed, and a flat spiral first heat transfer tube can be provided, and the entire heat exchange device can be made more compact.

In a seventh aspect of the present invention, in particular, in the heat exchange device according to any one of the first to sixth aspects, the first heat transfer tube is provided in parallel, and the flow path of the first heat transfer tube is multipathed. It is to be. According to the present embodiment, the capacity of the heat exchange device can be easily increased by modularizing the first heat transfer tube according to the use and necessity, and the demand for large capacity and large capacity can be met.

In an eighth aspect of the invention, in particular, in the heat exchange device according to any one of the first to seventh aspects, the second heat transfer tube is a double tube constituted by an inner tube and an outer tube. According to the present embodiment, by making the second heat transfer tube a double tube, even if either the inner tube or the outer tube is damaged, the second fluid flows through the inner tube and the first heat transfer tube. Since a leakage groove is provided between the first fluid and the first fluid, the second fluid can be prevented from mixing together, early failure diagnosis and quick repair can be realized, and a highly reliable heat exchange device can be realized. Can be provided. In addition, since the second heat transfer tube having the double structure is twisted, the inner tube and the outer tube are brought into close contact with each other, the thermal resistance between the inner tube and the outer tube is reduced, and the heat of the heat exchange device is reduced. Exchange performance can be secured.

In particular, the ninth invention includes a heat pump hot water supply device in which the refrigerant pressure, which is composed of a compressor, a radiator, a decompressor, a heat absorber, and the like, is equal to or higher than a critical pressure, and any one of the first to eighth inventions as a radiator. The second fluid refrigerant heats the first fluid using the heat exchange device. According to this embodiment, the second fluid flowing through the second heat transfer tube is used as a refrigerant in a heat pump cycle that is above the critical pressure, and the first fluid is heated using the heat release of the refrigerant, thereby realizing high cycle performance efficiency. can do. Moreover, the first fluid can be efficiently heated to a required high temperature level by setting the pressure to a critical pressure or higher. Thus, a highly efficient cycle apparatus is realizable by using a compact highly efficient heat exchange apparatus as a heat pump cycle radiator.

In a tenth aspect of the invention, in particular, in the heat pump water heater of the ninth aspect of the invention, the second fluid flowing through the second heat transfer tube is a carbon dioxide refrigerant. According to the present embodiment, by flowing a carbon dioxide refrigerant having a supercritical pressure in the second heat transfer tube having a small diameter, the tube wall of the first heat transfer tube can be designed with a relatively thin wall thickness, and carbon dioxide. A low-weight, compact, and high-performance heat exchange device can be provided without impairing the heat transfer characteristics of the refrigerant in the tube. In addition, for example, by using water as the first fluid, the entire circumference of the outer periphery of the second heat transfer tube contributes as an effective heat transfer area, and the water can be heated with the heat of the carbon dioxide refrigerant. Can be provided.

(Embodiment 1)
FIG. 1 is a configuration diagram of a heat exchange device showing a storage state of the heat exchange device according to the first embodiment of the present invention. FIG. 1A is a plan view of the heat exchange device, and FIG. 1B is a side view of the heat exchange device. 2 is a configuration diagram of the heat exchange device portion in the AA plane shown in FIG. 1, FIG. 3 is a configuration diagram of the heat exchange device portion in the BB plane shown in FIG. 1, and FIG. 4 is the heat exchange device. FIG. 5 is a cross-sectional view of the second heat transfer tube, and FIG. 6 is a configuration diagram of a heat pump hot water supply device using the heat exchange device.

1 to 3, reference numerals 20a and 20b denote, for example, first heat transfer pipes having different pipe diameters through which water of the first fluid flows, and 21 denotes a different-diameter communication portion that connects the first heat transfer pipes 20a and 20b. The first heat transfer tube 20a having a small tube diameter and the first heat transfer tube 20b having a large tube diameter communicate with each other through the diameter communication portion 21. 22a and 22b are included in the first heat transfer tubes 20a and 20b, for example, a second heat transfer tube (details will be described later) through which a second fluid carbon dioxide refrigerant flows, and AA is a flat spiral shape of the first heat transfer tube 20a. BB is a first plane that is wound and accommodated, and BB is a second plane that the first heat transfer tube 20b is wound and accommodated in a plane spiral shape . 23 is an inlet header that communicates with the second heat transfer tubes 22a and 22b and into which the second fluid flows, and 24 is an outlet header that communicates with the second heat transfer tubes 22a and 22b and through which the second fluid flows out, and the second heat transfer tubes 22a and 22b. In each of the portions between the inlet header 23 and the outlet header 24, there is no seam and the structure is one. Reference numeral 25 denotes a hot water outlet portion from which the first fluid corresponding to the inlet header 23 flows out, and reference numeral 26 denotes a water inlet portion into which the first fluid corresponding to the outlet header 24 flows. R1 indicates the bending radius of the first heat transfer tube 20a, and R2 indicates the bending radius of the first heat transfer tube 20b. As described above, the first heat transfer tube 20a having a small tube diameter has a bending radius R1 and is wound in a plane spiral shape. After being stored in the first plane AA, the first heat transfer tube 20b having a large tube diameter has a bending radius. In R2, it is wound in a plane spiral shape and accommodated in the second plane BB, and the different diameter communication portion 21 is located in the first heat transfer tube 20a located in the first plane and the second plane located in the second plane. The portion of the heat transfer tube 20b is communicated.

  In FIG. 4, two second heat transfer tubes 22a and 22b are twisted in a spiral shape at a predetermined pitch while being in close contact with each other. The twisted second heat transfer tube is arranged in the first heat transfer tube 20a, and is naturally spiraled between the outer wall of the second heat transfer tubes 22a and 22b and the inner wall of the first heat transfer tube 20a or 20b. A flow path 27 of the fluid such as water is formed, and the second fluid such as carbon dioxide refrigerant is also spirally swirled by the torsion of the second heat transfer tube, so that both the first fluid and the second fluid are turbulent, The second fluid flowing through the two heat transfer tubes 22a and 22b and the first fluid flowing through the first heat transfer tubes 20a and 20b can efficiently exchange heat, and a heat exchange device with good heat exchange performance can be obtained.

  In FIG. 5, 28 is an outer tube constituting the second heat transfer tube 22a or 22b, 29 is an inner tube constituting the second heat transfer tube 22a or 22b, and the inner wall of the outer tube 28 and the outer wall of the inner tube 29 are The second heat transfer tubes 22a and 22b have a double tube structure. Reference numeral 30 denotes a leakage groove on the inner wall side of the outer tube 28, which is configured to guide the fluid leaked between the inner wall of the outer tube 28 and the outer wall of the inner tube 29 to the end of the second heat transfer tube.

  In FIG. 6, the compressor 31, the heat radiator 32, the pressure reduction means 33, and the heat absorber 34 are connected to the closed circuit by the refrigerant circuit. The refrigerant circulation circuit uses, for example, carbon dioxide (CO2) as a refrigerant, and uses a supercritical heat pump cycle in which the refrigerant pressure on the high pressure side is equal to or higher than the critical pressure of the refrigerant. The compressor 31 is driven by a built-in electric motor (not shown), and compresses and sucks the sucked refrigerant to a critical pressure. The decompression means 33 is a throttle valve driven by a stepping motor (not shown) and controls the refrigerant flow path resistance.

The radiator 32 includes a refrigerant channel and a water channel that performs heat exchange with the refrigerant channel. And this radiator 32 uses the above-mentioned heat exchange device, the refrigerant channel is the second heat transfer tubes 22a, 22b, the water channel is the inner wall of the first heat transfer tubes 20a, 20b and the outer wall of the second heat transfer tubes 22a, 22b. It is set as the flow path 27 between. As described above, the inlet header 23 of the second heat transfer tube of the heat exchange device described above communicates with the refrigerant circulation circuit portion from the compressor 31, and the outlet header 24 communicates with the refrigerant circulation circuit portion to the decompressor 33. It is connected. Then, the flow direction of the coolant channel of the second heat exchanger tube is in the flow direction and facing the water flow path.

  A water supply pipe 35 for supplying water or pre-warm water to the water flow path 27 and a hot water supply circuit 37 for passing hot water discharged from the water flow path 27 to the hot water storage tank 36 are connected. The water supply pipe 35 is connected to the water inlet 26 of the heat exchanger described above, and the hot water outlet 25 of the heat exchanger is connected to the hot water supply circuit 37. A laminated pump 38 transports water or pre-warm water provided in the water supply pipe 35. In this way, water or pre-warm water is transported from the hot water storage tank 36 to the stacking pump 38, heated to a predetermined temperature in the water flow path 27, and then transported and stored in the hot water storage tank 36. Reference numeral 39 denotes a hot water discharge pipe communicating with the hot water storage tank 36.

  Next, the operation and action will be described. When water or pre-warm water is supplied from the hot water storage tank 36 through the water supply pipe 35, the compressor 31 is started, the refrigerant is compressed to a high temperature / high pressure critical state, and the heat pump cycle is activated. .

  The high-temperature and high-pressure refrigerant gas discharged from the compressor 31 flows into the radiator 32 and heats the water flowing through the water flow path 27. Then, the heated water flows through the hot water supply circuit 37 and flows into the hot water storage tank 36, where it is stored and heated. On the other hand, the refrigerant cooled by the radiator 32 is depressurized by the decompression means 33 and flows into the heat absorber 34, where it absorbs natural energy such as atmospheric heat, solar heat, and underground heat to evaporate and is converted into the compressor 31. Return.

  When there is a demand for hot water supply, hot water stored in the hot water storage tank 36 is supplied to the hot water supply faucet (not shown) used by the user through the hot water supply pipe 39. Depending on the temperature level of hot water supply demand, it can be mixed with tap water or the like and supplied at a predetermined temperature.

  In the radiator 32, the refrigerant flowing through the refrigerant flow path second heat transfer tubes 22 a and 22 b of the radiator 32 is pressurized to a critical pressure or higher by the compressor 31, so that the water flowing through the water flow path 27 of the radiator 32 Condensation does not occur even if the temperature drops due to heat deprivation. Therefore, it becomes easy to form a temperature difference between the refrigerant and the water in the entire radiator 32, high-temperature hot water can be obtained, and the heat exchange efficiency can be increased, so that a highly efficient heat pump cycle type hot water supply device can be provided. .

  In addition, by arranging the two second heat transfer tubes 22a and 22b twisted in a spiral manner in the first heat transfer tubes 20a and 20b, a natural space is formed between the inner wall of the first heat transfer tube and the outer wall of the second heat transfer tube. In addition, the first fluid water flow path 27 is formed at the same time, and the second fluid coolant is also swirled in a spiral shape, so that both the first fluid water and the second fluid coolant are turbulent and efficient. A heat exchanging device with good heat exchanging performance can be obtained.

  Further, by twisting the second heat transfer tubes 22a and 22b in a spiral manner, it is not necessary to braze or the like, and the entire surface of the second heat transfer tubes 22a and 22b is contributed as a heat transfer area by a simple construction method. Since the second fluid refrigerant and the first fluid water are swirled, the heat transfer rate can be improved by the effect of turbulent flow disturbance, and a low-cost heat exchange device can be obtained.

  Further, since the second heat transfer tubes 22a and 22b are arranged in the first heat transfer tubes 20a and 20b, the surfaces of the first heat transfer tubes 20a and 20b are continuous smooth curved surfaces. It is possible to work with ordinary pipe benders, etc., so processing costs and capital investment can be reduced.

  Further, the second heat transfer tubes 22a and 22b are twisted in a spiral shape while being in close contact with each other, and are disposed in the first heat transfer tubes 20a and 20b, so that the second heat transfer tubes 22a and 22b are twisted when the first heat transfer tubes 20a or 20b are bent. Further, the second heat transfer tubes 22a and 22b act as an inner core, and the first heat transfer tube 20a or 20b can be bent with a smaller bending radius, so that a highly compact heat exchange device can be provided. .

  In addition, since the second heat transfer tubes 22a and 22b are seamless and formed of a single piece over the entire length, only the surface of the second heat transfer tubes 22a and 22b is in contact with the water of the first fluid. It is possible to improve the corrosion resistance of one fluid to water and the reliability of the entire heat exchange device. Moreover, the efficiency of the operation | work which twists a 2nd heat exchanger tube etc. improves, a connection brazing operation | work etc. become unnecessary and workability | operativity can be improved.

  Moreover, the pipe diameter of the 1st heat exchanger tube 20b located in 2nd plane BB is made larger than the pipe diameter of the 1st heat exchanger tube 20a located in 1st plane AA, 2nd plane BB. In the first heat transfer tube 20b located in the first heat transfer tube 20b, the cross-sectional area through which the first fluid water flows can be increased. Can be provided.

  The first heat transfer tubes 20a and 20b having different tube diameters are positioned on the first plane AA and the second plane BB, respectively, and the same pipe diameter is the same plane so that the first pipes having the same pipe diameter are the same. Since the heat pipes are swirled in the same plane, it is possible to realize a more compact storage property, simplify production management, and improve work efficiency.

  Moreover, since the number of jigs of a bending jig, for example, a pipe bender, can be minimized by setting the first heat transfer pipe having the same pipe diameter, for example, 20a, to the same bending radius R1, the continuous workability is improved and the processing cost is reduced. Reduction can be realized.

  In addition, by setting the bending radius R2 of the first heat transfer tube 20b having a large tube diameter to be larger than the bending radius R1 of the first heat transfer tube 20a having a small tube diameter, the first heat transfer tube 20b having a large tube diameter is bent. Since the radius is increased, it is easy to bend, the flow of the first fluid in the first heat transfer tube 20b can be made smooth, and sedimentation of scale due to sudden bending or stagnation can be reduced.

  In addition, by flowing a supercritical pressure carbon dioxide refrigerant in the second heat transfer tube with a small diameter, the tube wall of the first heat transfer tube can be designed with a relatively thin wall thickness, and the heat transfer characteristics of the carbon dioxide refrigerant in the tube The heat pump type hot water supply apparatus can be provided with a light, compact, and high performance heat exchange device without impairing the heat.

  Further, by making the second heat transfer tube a double tube, even when either the inner tube 29 or the outer tube 28 is damaged, the second fluid refrigerant flowing through the inner tube 29 and the first heat transfer tube flowing through the first heat transfer tube are used. Since the leakage groove 30 is provided between the water of one fluid, it is possible to prevent the first fluid and the second fluid from mixing with each other, realize early failure diagnosis and quick repair, and reliable heat exchange. An apparatus can be provided. In addition, since the second heat transfer tube having the double structure is twisted, the inner tube 29 and the outer tube 28 are brought into close contact with each other, and the thermal resistance between the inner tube and the outer tube is reduced. The heat exchange performance can be ensured.

  As described above, the first heat transfer tubes 20a and 20b including the second heat transfer tubes 22a and 22b twisted in a spiral shape are stored in a plane spiral shape on the first plane, and then stored in a plane spiral shape on the second plane. Thus, by laminating in a plurality of planes, the first heat transfer tubes can be accommodated with high density, and a compact low-cost heat exchange device with good heat exchange performance can be provided.

(Embodiment 2)
FIG. 7: is a heat exchange apparatus block diagram which shows the accommodation state of the heat exchange apparatus in the 2nd Embodiment of this invention, (a) of FIG. 7 is a top view of the same heat exchange apparatus, (b) of FIG. ) Is a side view of the heat exchange device. FIG. 8 is a configuration diagram of the heat exchange device portion in the AA plane shown in FIG. 7, and FIG. 9 is a configuration diagram of the heat exchange device portion in the BB plane shown in FIG.

  In the present embodiment, the difference from the first embodiment is that the first heat transfer tubes 20a and 20b having different tube diameters are mixed on the second plane, and the first spiral and the second plane are spirally wound. One heat transfer tube is newly provided with a fixture 40 for fixing the first heat transfer tube of the first plane and the second plane so that the height substantially corresponds to the tube diameter of the first heat transfer tube in a direction perpendicular to the plane. It is. In addition, the thing of the same structure as the heat exchange apparatus and heat pump hot-water supply apparatus of Embodiment 1 gives the same code | symbol, and abbreviate | omits description.

About the heat exchange apparatus comprised as mentioned above, the effect | action and operation | movement are demonstrated below. As shown in FIGS. 7 to 9, the first heat transfer tube 20 a is spirally swirled on the first plane AA and then spirally swirled to the second plane BB, and then the first heat transfer tube 20 a. Is communicated with the first heat transfer tube 20b having a large tube diameter through the different diameter communication portion 21 on the second plane BB.

  Thus, the 1st heat exchanger tube located in 2nd plane BB has 20b of the large pipe diameter pipe | tube stage part and 20a of a small pipe diameter pipe | tube stage part from which a pipe diameter differs, and is used for required applications, for example, a hot water storage tank. Depending on the hot water storage temperature and the hardness of the local tap water to be used, the ratio ratio of 20b of the large pipe diameter step portion and 20a of the small pipe diameter step portion can be adjusted. An exchange device can be provided.

  Further, in the same plane spiral, by arranging the large pipe diameter step portion 20b on the outer peripheral side and the small pipe diameter step portion 20a on the inner peripheral side, the large pipe diameter step portion can obtain a more straight pipe portion. Therefore, it is possible to provide a heat exchange device that is resistant to scale precipitation and precipitation.

  Further, the heat exchanging device is provided with a fixture 40 so as to have a height substantially corresponding to the tube diameter of the first heat transfer tubes 20a and 20b, thereby perpendicular to the plane generated when the first heat transfer tubes 20a and 20b are spirally swirled. In addition to suppressing the springback force in any direction, a flat spiral first heat transfer tube can be provided, and the entire heat exchange device can be made more compact.

(Embodiment 3)
FIG. 10 is a side view of a heat exchange device according to the third embodiment of the present invention. 11 and 12 are enlarged views of the main part of the entrance / exit of the heat exchanger.

  In the present embodiment, the difference from the first embodiment is that the first heat transfer tube including the second heat transfer tube described in the first embodiment is spirally swirled in the first plane and then in the second plane. In other words, two heat exchanging devices that are spirally arranged are stacked and provided side by side.

  As shown in FIGS. 10-12, the 1st heat exchanger tubes 20a and 20b connected by the different diameter communication part 21, the hot water supply part 25 corresponding to the 1st heat exchanger tube 20b, and the water intake part 26 corresponding to the 1st heat exchanger tube 20a. Two heat exchanging devices described in the first embodiment including the above are provided one above the other.

  41 is a water inlet branch portion that communicates with each water inlet portion 26. The water inlet branch portion 41 is configured so that the water of the first fluid is evenly branched and flows to the first heat transfer pipe via each water inlet portion 26. It has become. Reference numeral 42 denotes an outlet merging portion that communicates with each outlet header 24. The outlet merging portion 42 is configured so that the refrigerant of the second fluid flows out from the second heat transfer tubes 22a and 22b evenly.

  43 is a separation pipe provided in the vicinity of the hot water outlet 25 to separate the second heat transfer tubes 22a and 22b from the first heat transfer tube 20b. There is no passage through which the first fluid flows at the tip of the separation tube 43, and the second heat transfer tubes 22a and 22b are exposed. The second heat transfer tubes 22a and 22b communicate with the inlet branch portion 44. The inlet branch portion 44 is configured such that the refrigerant of the second fluid flows evenly to the second heat transfer tubes 22a and 22b. Yes. In addition, the thing of the same structure as the heat exchange apparatus of Embodiment 1 gives the same code | symbol, and abbreviate | omits description.

  About the manufacturing apparatus of the heat exchange apparatus comprised as mentioned above, the effect | action and operation | movement are demonstrated below.

  In this way, by providing a plurality of heat exchange devices described in Embodiment 1 in parallel, and by making the flow paths of the first heat transfer tube and the second heat transfer tube multipath, depending on the application and necessity, etc. Thus, the heat exchange apparatus described in the first embodiment is modularized, so that the capacity of the heat exchange apparatus can be easily increased, and various demands for large capacity and large capacity can be met.

  In each of the above embodiments, the first heat transfer tubes 20a and 20b having different tube diameters are used. However, the same effect can be obtained by using only the first heat transfer tubes having the same tube diameter, for example, 20a.

  In each of the above embodiments, the first heat transfer tubes are stacked on two planes. However, the present invention is not limited to this, and the same effect can be obtained by stacking on two or more planes.

  In each of the above embodiments, the number of the second heat transfer tubes is two, but the same effect can be obtained even when two or more, for example, three are twisted.

  In each of the above embodiments, the second fluid is natural refrigerant carbon dioxide, but the same effect can be obtained by using other refrigerants such as R410.

  In addition, in each said Example, it was set as the heat exchange apparatus used with the heat pump cycle type hot-water supply apparatus, However, The same effect is acquired even if it uses as a heat exchange apparatus in another use.

  In each of the above embodiments, the hot water heated in the water flow path is stored in the hot water storage tank, but the same effect can be obtained even if it flows directly to a hot water supply terminal used by the user, such as a shower faucet.

  As described above, the heat exchanger according to the present invention and the heat pump water heater using the heat exchanger can provide a low-cost and compact heat exchanger with good heat exchange performance, and use it in the heat pump cycle water heater. And a highly efficient heat pump hot-water supply apparatus is obtained. In addition, it can be widely applied to applications such as heat exchange and heat transfer.

(A) is a top view of the heat exchange device showing the storage state of the heat exchange device in Embodiment 1 of the present invention (b) is a side view of the heat exchange device (A) is a plan view of the AA plane in FIG. 1 (b) is a side view of the AA plane in FIG. (A) is a plan view of the BB plane in FIG. 1 (b) is a side view of the BB plane in FIG. The principal part expanded sectional view of the heat exchange apparatus in Embodiment 1 of this invention. The longitudinal cross-sectional view of the 2nd heat exchanger tube of the heat exchange apparatus in Embodiment 1 of this invention The block diagram of the heat pump hot-water supply apparatus using the heat exchange apparatus in Embodiment 1 of this invention (A) is a top view of the heat exchange apparatus which shows the accommodation state of the heat exchange apparatus in Embodiment 2 of this invention (b) is a side view of the heat exchange apparatus (A) is a plan view of the AA plane in FIG. 7 (b) is a side view of the AA plane in FIG. (A) is a plan view of the BB plane in FIG. 7 (b) is a side view of the BB plane in FIG. Side view of heat exchange apparatus according to Embodiment 3 of the present invention The principal part enlarged view of the entrance / exit of the heat exchange apparatus in Embodiment 3 of this invention The principal part expansion perspective view of the entrance and exit of the heat exchange apparatus in Embodiment 3 of this invention (A) is a plan view of a conventional heat exchange device (b) is a side view of the heat exchange device

Explanation of symbols

20a First heat transfer tube (small tube diameter tube stage)
20b 1st heat transfer tube (large diameter tube stage)
22a, 22b Second heat transfer tube 28 Outer tube 29 Inner tube 30 Leakage groove 31 Compressor 32 Radiator 33 Decompressor 34 Heat absorber 40 Fixing tool (fixing means)

Claims (10)

A first heat transfer tube through which the first fluid flows, and a second heat transfer tube that is arranged in the first heat transfer tube and is configured by spirally twisting a plurality of heat transfer tubes through which the second fluid flows. The heat transfer tubes are housed in a plane spiral on the first plane and then stacked in a plurality of planes so as to be housed in a plane spiral on the second plane , and the first heat transfer tube is bent with the same tube diameter. A heat exchange device having a constant radius . The heat exchanger according to claim 1, wherein the second heat transfer tube is seamless over the entire length. 3. The heat exchange device according to claim 1, wherein the flat spiral first heat transfer tube located in the first plane and the flat spiral first heat transfer tube located in the second plane have different tube diameters. . The flat spiral first heat transfer tube located on the first plane or the second plane is a heat exchange device according to any one of claims 1 to 3, comprising a large tube diameter tube stage and a small tube diameter tube stage having different tube diameters. The heat exchanging apparatus according to any one of claims 1 to 4 , wherein a bending radius of the first heat transfer tube portion having a large tube diameter is made larger than a bending radius of the first heat transfer tube portion having a small tube diameter. Claims, characterized in that the first plane and the planar spiral first heat exchanger tube of the second plane, provided with fixing means so as to be substantially equivalent to the height to the tube diameter of the first heat exchanger tube in a direction perpendicular to the plane The heat exchange apparatus of any one of 1-5 . The heat exchange device according to any one of claims 1 to 6, wherein a plurality of first heat transfer tubes are provided side by side, and the flow path of the first heat transfer tubes is multipathed. A double pipe constituted the second heat exchanger tube is by the inner and outer tubes, between the inner tube and the outer tube, any one of the preceding claims, characterized in that a leakage groove The heat exchange apparatus as described. A heat exchange device according to any one of claims 1 to 8 , further comprising a heat pump cycle device including a compressor, a radiator, a decompressor, a heat absorber, and the like, wherein the pressure of the refrigerant is equal to or higher than a critical pressure. A heat pump water heater in which the second fluid refrigerant heats the first fluid. The heat pump hot water supply apparatus according to claim 9, wherein carbon dioxide is used as a refrigerant of the second fluid.

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