JP2003279138A - Heat exchanger and heat pump type water heater using this heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger superior in heat exchange efficiency while preventing corrosion caused by spark erosion by eliminating clearance generated between alternately superposed dissimilar metal pipes. <P>SOLUTION: This heat exchanger 12 has a copper first heat exchange pipe 12A for allowing a heat exchange object liquid to flow inside, and an aluminum second heat exchange pipe 12B for allowing a heating medium to flow inside, and spirally winds these first heat exchange pipe 12A and second heat exchange pipe 12B by being mutually superposed so as to become alternate, and is constituted so that the almost whole surface is covered with a dip processing film X. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which a plurality of pipes are spirally wound, and a heat pump type hot water supply apparatus using the heat exchanger.

[0002]

2. Description of the Related Art Conventionally, in a heat pump type hot water supply apparatus of this type, as described in Japanese Patent Laid-Open No. 2001-248904, a heat exchanger for refrigerant and water is used to generate heat and water for the refrigerant. By exchanging heat, the water can be heated and stored in a hot water supply tank or the like.

By the way, the conventional heat exchanger 1 for refrigerant and water is used.
As shown in FIG. 5, the first heat exchange pipe 2 through which the water in the hot water supply circuit flows and the second heat exchange pipe 3 in the refrigerant circulation circuit through which the high-temperature, high-pressure gas refrigerant compressed by the compressor flows are in contact with each other. In order to exchange heat with each other, they are alternately superposed and wound in a spiral shape, and are configured so that the overall shape is a substantially cylindrical shape.

The lower end side of the heat exchanger 1 is placed, for example, on the bottom plate 4 of the outer case of the heat pump water heater, and the fixing cover plate 5 and the bottom plate 4 of the outer case are covered on the upper end side. Is installed and fixed in the outer case using a fastener 6 such as a bolt and a nut.

By the way, in the above-mentioned conventional heat exchanger 1 for refrigerant-to-water, the first heat exchange pipe 2 through which water flows is often the case that the flowing water is drunk.
The second heat exchange pipe 3 through which the refrigerant flows is generally made of aluminum or an aluminum alloy, while it is made of copper or a copper alloy having a sterilizing action. In this way, when the first heat exchange pipe 2 and the second heat exchange pipe 3 that are in contact with each other are made of different metals, and if there is a gap in which water accumulates between them, the influence of the water and oxygen in the air Since the battery reaction causes electrolytic corrosion, it is necessary to prevent electrolytic corrosion by applying a surface treatment such as painting or alumite treatment to the heat exchange pipe made of aluminum or aluminum alloy.

However, when a heat exchange pipe made of aluminum or an aluminum alloy is subjected to surface treatment such as painting or alumite treatment to prevent galvanic corrosion, a coating film by painting or an aluminum oxide layer by alumite treatment is used. There has been a problem that a heat insulating effect is generated and heat exchange efficiency is reduced.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and eliminates the gaps formed between the alternately stacked dissimilar metal pipes and prevents corrosion caused by electrolytic corrosion. At the same time, it is an object of the present invention to provide a heat exchanger having good heat exchange efficiency and to provide a heat pump type hot water supply device capable of performing efficient heat pump operation.

[0008]

According to another aspect of the present invention, there is provided a first heat exchange pipe made of copper in which a liquid to be exchanged heat flows, and a first heat exchange pipe made of aluminum in which a heat medium flows. A heat exchanger comprising two heat exchange pipes, wherein the first heat exchange pipes and the second heat exchange pipes are superposed on each other and wound in a spiral shape, and a substantially entire surface is dip It is characterized by being covered with a treatment film.

According to the second aspect of the present invention, there is provided a first heat exchange pipe made of copper in which a liquid to be heat exchanged flows, and a second heat exchange pipe made of aluminum in which a heat medium flows. A heat exchanger having a configuration in which the first heat exchange pipe and the second heat exchange pipe are alternately stacked and spirally wound, and are tightened from both ends by a tightening device. Then, substantially the entire surface including the tightening device is covered with a dip-treated film.

In the invention according to claim 3 of the present invention, in the heat exchanger according to claim 1 or 2, tin is used as a dip material for forming the dip-treated film. And

In the invention according to claim 4, the heat exchanger according to claim 1 or 2 is characterized in that zinc is used as a dip material for forming the dip-treated film. And

In the heat exchanger of the present invention according to claim 5, in the heat exchanger according to claim 1 or 2, lead-free solder is used for the dip material forming the dip-treated film. Characterize.

In the invention relating to the heat pump type hot water supply apparatus according to the sixth aspect, the first heat exchange pipe made of copper through which hot and cold water flows inside and the second heat exchange pipe made of aluminum through which a CO2 refrigerant flows inside.
In a heat pump type hot water supply apparatus having a heat exchanger spirally wound so as to be alternately stacked with heat exchange pipes, the heat exchanger has substantially the entire surface thereof covered with a dip-treated film. It has a feature.

In the invention relating to the heat pump type hot water supply apparatus according to claim 7, the first heat exchange pipe made of copper through which hot and cold water flows inside and the second heat exchange pipe made of aluminum at which CO2 refrigerant flows inside.
A heat pump hot water supply apparatus having a heat exchanger spirally wound so that the heat exchange pipes and the heat exchanger pipes alternate with each other, and the heat exchanger is tightened from both ends by a tightening device, The heat exchanger is characterized in that substantially the entire surface thereof including the tightening device is covered with a dip-treated film.

In the invention relating to the heat pump type hot water supply apparatus according to claim 8, in the heat pump type hot water supply apparatus according to claim 6 or 7, tin is used as a dip material for forming the dipping film. Is characterized by.

In the invention relating to the heat pump type hot water supply apparatus according to claim 9, in the heat pump type hot water supply apparatus according to claim 6 or 7, zinc is used as a dipping material for forming the dipping film. Is characterized by.

In the invention relating to the heat pump water heater according to claim 10, in the heat pump water heater according to claim 6 or 7, lead-free solder is used as the dip material for forming the dip-treated film. It is characterized by

[0018]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 is an overall schematic configuration diagram of a heat pump type hot water supply apparatus including an embodiment of a heat exchanger according to the present invention, and FIG. 2 is a schematic diagram showing a refrigerant circulation circuit and a hot water supply circuit.

1 and 2, a heat pump type hot water supply apparatus 10 includes a refrigerant circulation circuit A including a compressor 11, a refrigerant-to-water heat exchanger (heat exchanger) 12, a pressure reducing device 13, and an evaporator 14. The hot water tank 15, the circulation pump 16, and the hot water supply circuit B to which the refrigerant-to-water heat exchanger 12 is connected,
The compressor 11, the refrigerant-to-water heat exchanger 12, the decompression device 1
3, the evaporator 14, the hot water storage tank 15, the circulation pump 16 and the like are housed in the outer case 17.

The outer case 17 is divided into an upper chamber 17A and a lower chamber 17B by a partition wall 18, and a compressor 11, an evaporator 14 and the evaporator 1 are provided in the upper chamber 17A.
4 is provided with a blower 19 for blowing air, while the lower chamber 17B has a refrigerant-to-water heat exchanger 12 and a hot water storage tank 1 therein.
5, a circulation pump 16 and the like are arranged.

Reference numeral 20 denotes a pedestal as a bottom plate of the outer case 17, and the heat exchanger 12 for refrigerant and water is mounted and fixed on the pedestal 20 via a fixed base 30 and the circulation pump 16 is provided.
Is mounted and fixed, and the hot water storage tank 15 has the support legs 15A.
Placed and fixed via.

In the heat pump type hot water supply apparatus 10 described above, high temperature and high pressure CO 2 discharged from the compressor 11 is used.
The superheated gas refrigerant of (carbon dioxide) refrigerant flows into the refrigerant-to-water heat exchanger 12, and heats the water sent from the circulation pump 16 here. Then, the condensed and liquefied refrigerant is decompressed by the decompression device 13 and flows into the evaporator 14, where it absorbs atmospheric heat to be evaporated and gasified, and then returns to the compressor 11. On the other hand, the hot water heated in the refrigerant-to-water heat exchanger 12 flows into the upper part of the hot water storage tank 15, is stored in the hot water storage tank 15, and the hot water stored in the hot water storage tank 15 is stored as necessary. Supplied to the user department.

Next, the refrigerant-to-water heat exchanger (heat exchanger) 12 will be described in detail with reference to FIGS. Figure 3
FIG. 4 is a cross-sectional view of the heat exchanger for refrigerant-to-water, and FIG.

In FIG. 3, the refrigerant-to-water heat exchanger 1 is shown.
2 is a first heat exchange pipe 12A in which water (heat exchange liquid) sent from the circulation pump 16 flows, and C in the inside.
A second heat exchange pipe 12B through which a superheated gas refrigerant (heat medium) of O2 refrigerant flows is configured, and the first heat exchange pipe 12A and the second heat exchange pipe 12B are alternately stacked. It is spirally wound and formed into a substantially cylindrical shape as a whole.

The first heat exchange pipe 12A is formed of, for example, a copper pipe having a thickness of about 1 mm and a hollow flat cross-section, while the second heat exchange pipe 12B has a superheated gas refrigerant inside. Independent refrigerant passages (heat medium passages) 21 and 21 of 3 to 6 passages (4 passages in the embodiment) that flow independently of each other
Are formed of flat porous aluminum tubes formed side by side along the horizontal direction (longitudinal direction) in the longitudinal section.

Further, the heat exchanger 12 for refrigerant and water having the above-mentioned structure.
As shown in FIG. 1 or FIG. 3, the fixing cover plate 24 is placed on the fixing base 30 and the upper end thereof is covered with a fixing cover plate 24, and the fixing cover plate 24 and the fixing base 30 are bolts and nuts. The heat exchanger 1 for refrigerant to water is fastened by fasteners 25, such as the fixing table 30, fixing lid plate 24, and fasteners 25.
A tightening device Z for tightening 2 from both upper and lower ends thereof is configured. Reference numerals 31 and 31 denote a plurality of holes formed in the fixed base 30.

Here, the refrigerant-to-water heat exchanger 12 including the tightening device Z is entirely dipped in a dip treatment tank using tin as a dip material, and the dip treatment is performed on almost the entire surface thereof. The treatment film X is formed, and the dip treatment film X covers substantially the entire surface of the refrigerant-to-water heat exchanger 12 including the tightening device Z.

As shown in FIG. 4, the gap formed in the refrigerant-to-water heat exchanger 12 by the dip treatment, that is,
A gap between the first heat exchange pipe 12A and the second heat exchange pipe 12B, the tightening device Z, and the heat exchanger 12 for refrigerant and water.
Tin flows into the gaps formed between and, and these gaps are closed by the tin dip film X.

The refrigerant-to-water heat exchanger 12 constructed as described above has a first heat exchange pipe 12A made of a copper tube having a hollow flat shape in longitudinal section through which water (liquid to be exchanged) flows. Refrigerant passages (heat medium passages) 21 and 21 of 3 to 6 passages (4 passages in the embodiment), which are independent of each other, in which the heating gas refrigerant (heat medium) of the CO 2 refrigerant flows inside are arranged in the horizontal direction (longitudinal direction) in the vertical section. The second heat exchange pipes 12B made of flat porous aluminum tubes formed side by side along the above are alternately superposed on each other and spirally wound, and formed into a substantially cylindrical shape as a whole. Is. Then, the refrigerant-to-water heat exchanger 12 is entirely placed in a tin dip treatment tank in a state in which both upper and lower ends are fastened by a fixing base 30 serving as a tightening device Z, a fixing lid plate 24, and a fastener 25. Since it is soaked and subjected to a dip treatment, and substantially the entire surface thereof is covered with the tin dip treatment film X, the gap between the first heat exchange pipe 12A and the second heat exchange pipe 12B and the tightening device. Tin flows into the gap formed between Z and the refrigerant-to-water heat exchanger 12, and the gap is closed by the dip-treated film X of tin. Both heat exchange pipes 12A and 12B. There is no concern that electrolytic corrosion will occur between the second heat exchange pipe 12 and the tightening device Z, and corrosion and perforation due to electrolytic corrosion can be prevented.
The heat of the superheated gas refrigerant of the CO2 refrigerant flowing in B and 12B is efficiently heat-exchanged with the water flowing in the first heat exchange pipe 12A, and the water can be heated to about 90 ° C., which greatly improves the heat exchange efficiency. Can be used, and the second is made of aluminum tube
The heat exchange pipe 12B does not need to be painted or anodized.

Further, in the second heat exchange pipe 12B, the independent refrigerant passages 21 and 21 of 3 to 6 paths (4 paths in the embodiment) through which the superheated gas refrigerant flows inside are transverse (longitudinal direction) in a longitudinal section. ), It is formed of flat porous aluminum pipes formed side by side, so that the contact area with the first heat exchange pipe 12A can be increased and excellent heat exchange performance can be obtained. The superheated CO2 refrigerant superheated gas refrigerant flowing inside is dispersed in the plurality of refrigerant passages 21, 21 to form the refrigerant-to-water heat exchanger 12 having high pressure resistance.

Further, the refrigerant-to-water heat exchanger 12 having the above structure.
In the heat pump type hot water supply device 10 having the above, since heat conduction from the second heat exchange pipe 12B to the first heat exchange pipe 12A can be favorably maintained, the heat exchange efficiency between the CO2 refrigerant and water (hot water) can be improved, Allows efficient heat pump operation.

In the above-described embodiment, the dipping film X
Although tin is used as the dip material for forming the metal, zinc or lead-free solder may be used, and even in that case, the same effect as that of the one embodiment can be obtained. Further, although almost the entire surface of the refrigerant-to-water heat exchanger 12 including the tightening device Z is covered with the dip-treated film X, the refrigerant-to-water heat exchanger 12 alone does not include the tightening device Z. It is also possible to cover substantially the entire surface of the dip-treated film X.

Although the embodiments of the present invention have been described above, various alternatives, modifications or variations can be made by those skilled in the art based on the above description, and various alternatives without departing from the gist of the present invention, Modifications and variations are included.

[0034]

As described above, according to the first aspect of the present invention.
Alternatively, in the invention relating to the heat exchanger of 2, since the substantially entire surface is covered with the dip-treated film, there is no concern that electrolytic corrosion will occur, and corrosion or perforation due to electrolytic corrosion will not occur. It can be prevented, of course, from the second heat exchange pipe to the first
Since heat conduction to the heat exchange pipe can be maintained well, it is possible to provide a heat exchanger with high heat exchange efficiency.

In the invention according to claim 6 or 7 of the present invention, the heat exchanger for refrigerant and water is prevented from being corroded by galvanic corrosion while the heat exchanger for refrigerant and water is overheated. It is possible to provide a heat pump type hot water supply apparatus which can improve the heat exchange efficiency between the gas refrigerant and hot water and can perform efficient heat pump operation.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of a heat pump type hot water supply apparatus including an embodiment of a heat exchanger according to the present invention.

FIG. 2 is a schematic view showing a refrigerant circulation circuit and a hot water supply circuit of the heat pump hot water supply apparatus according to the present invention.

FIG. 3 is a cross-sectional view of a refrigerant-to-water heat exchanger showing an embodiment of the heat exchanger according to the present invention.

FIG. 4 is an enlarged sectional view of a main part of FIG.

FIG. 5 is a vertical cross-sectional view of a refrigerant-to-water heat exchanger showing a conventional example.

[Explanation of symbols]

10 Heat pump water heater 11 compressor 12 Refrigerant-to-water heat exchanger (heat exchanger) 12A First heat exchange pipe 12B Second heat exchange pipe 13 Pressure reducing device 14 Evaporator 15 Hot water storage tank 16 Circulation pump 17 exterior case 21 Refrigerant passage (heat medium passage) X-dipped film Z tightening device

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3L036 AA05 AA41 AA46                 3L103 AA05 AA35 AA36 AA37 BB43                       CC02 CC40 DD05 DD09 DD70

Claims (10)

[Claims] 1. A first heat exchange pipe made of copper in which a liquid to be heat exchanged flows, and a second heat exchange pipe made of aluminum in which a heat medium flows are provided inside, and the first heat exchange pipe and the second heat exchange pipe are provided. A heat exchanger in which exchange pipes are alternately stacked and spirally wound, and the heat exchanger is characterized in that substantially the entire surface is covered with a dip-treated film. 2. A first heat exchange pipe made of copper in which a liquid to be heat-exchanged flows inside, and a second heat exchange pipe made of aluminum in which a heat medium flows inside, wherein the first heat exchange pipe and the second heat exchange pipe are provided. A heat exchanger having a structure in which exchange pipes are alternately stacked and spirally wound, and tightened from both ends by a tightening device, and substantially the entire surface including the tightening device is dip A heat exchanger characterized by being coated with a treatment film. 3. The heat exchanger according to claim 1, wherein tin is used as a dip material forming the dip-treated film. 4. The zinc is used as a dip material for forming the dip-treated film.
Or the heat exchanger according to 2. 5. The heat exchanger according to claim 1, wherein lead-free solder is used as a dip material forming the dip-treated film. 6. A first heat exchange pipe made of copper, in which hot water flows, and a second aluminum pipe, in which CO2 refrigerant flows, inside.
In a heat pump type hot water supply apparatus having a heat exchanger spirally wound so as to be alternately stacked with heat exchange pipes, the heat exchanger has substantially the entire surface thereof covered with a dip-treated film. The heat pump type hot water supply device that features 7. A first heat exchange pipe made of copper, in which hot water flows, and a second heat pipe made of aluminum, in which a CO2 refrigerant flows.
A heat pump hot water supply apparatus having a heat exchanger spirally wound so that the heat exchange pipes and the heat exchanger pipes alternate with each other, and the heat exchanger is tightened from both ends by a tightening device, In the heat exchanger, the heat pump hot water supply device is characterized in that substantially the entire surface of the heat exchanger including the tightening device is covered with a dip treatment film. 8. The heat pump type hot water supply apparatus according to claim 6, wherein tin is used as a dip material for forming the dip-treated film. 9. The zinc is used as a dip material for forming the dip-treated film.
Alternatively, the heat pump hot water supply device according to item 7. 10. The heat pump type hot water supply apparatus according to claim 6, wherein lead-free solder is used as a dip material for forming the dip-treated film.