JP3768147B2 - Heat exchanger and heat pump water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger and a heat pump type water heater.
[0002]
[Prior art]
Conventionally, in this type of heat pump type water heater, as disclosed in Japanese Patent Application Laid-Open No. 2001-116357, heat exchange between the heat of the refrigerant and water is performed using a refrigerant-to-water heat exchanger. Thus, water can be heated and stored in a hot water supply tank or the like.
[0003]
By the way, as shown in FIG. 9, in the conventional heat exchanger 1 for refrigerant to water, the first heat exchange pipe 2 through which water in the hot water supply circuit flows and the high-temperature and high-pressure gas refrigerant compressed by the compressor flow. The second heat exchange pipe 3 of the refrigerant circulation circuit is in contact with the second heat exchange pipe 3 so as to exchange heat, and is alternately wound and spirally wound so that the overall shape is substantially cylindrical.
[0004]
The lower end side of the heat exchanger 1 is placed on, for example, the bottom plate 4 of the exterior case of the heat pump type hot water heater, and the fixing cover plate 5 and the bottom plate 4 of the exterior case are placed on the upper end side with bolts. It is installed and fixed in the outer case using a fixture 6 such as a nut.
[0005]
Incidentally, in the conventional refrigerant-to-water heat exchanger 1 described above, in order to increase the contact area between the first and second heat exchange pipes 2 and 3, the longitudinal cross-sectional shape of both the heat exchange pipes 2 and 3 is changed. Although it is formed in a flat ellipse shape, both heat exchange pipes 2 and 3 are in an overlapping state. Therefore, if the number of turns is increased to increase the heat exchange rate, the height of the heat exchanger 1 increases. There was a problem of increasing the size.
[0006]
The first heat exchange pipe 2 through which water flows is made of copper or a copper alloy having a bactericidal action because the flowing water is often drunk, while the second heat exchange pipe through which refrigerant flows. 3 is generally made of aluminum or an aluminum alloy. (Flattened oval tubes Ru is used for the first heat exchange pipe 2. The second heat exchange pipe 3, since the pressure of the refrigerant is easily deformed flattened oval tube by high KuKono pressure, flat outer longitudinal section shape An oval multi-hole pipe having a plurality of circular flow holes is used.) Thus, if the first heat exchange pipe 2 and the second heat exchange pipe 3 that are in contact with each other are different metals, In order to cause electric corrosion, it was necessary to prevent the electric corrosion by applying a surface treatment such as painting or alumite treatment to the heat exchange pipe made of aluminum or aluminum alloy.
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and is capable of providing a heat exchanger that is compact and has a high heat exchange efficiency, and a heat pump water heater that can perform an efficient heat pump operation. The main purpose is to be able to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the heat exchanger according to claim 1 includes a first heat exchange pipe through which a heat exchange liquid flows and a second heat exchange pipe through which a heat medium flows. A plurality of the second heat exchange pipes are embedded along the axial direction of the peripheral wall of the first heat exchange pipe, and the first heat exchange pipe through which the heat exchange liquid flows has a flat elliptical cross section. It is characterized by presenting .
[0009]
The heat exchanger according to claim 2 is the heat exchanger according to claim 1, wherein the first heat exchange pipe is spirally wound together with the second heat exchange pipe, and a heat medium is provided. The flowing second heat exchange pipe is embedded along the widthwise direction of the flat elliptical shape in the first heat exchanger .
[0010]
[0011]
[0012]
[0013]
[0014]
[0015]
The invention of the heat pump type hot water heater according to claim 3 includes a first heat exchange pipe through which a heat exchange liquid flows and a second heat exchange pipe through which a heat medium flows, wherein the first heat exchange pipe A plurality of the second heat exchange pipes are embedded along the axial direction in the peripheral wall of the first heat exchange pipe, and the first heat exchange pipe through which the heat exchange liquid flows has a flat elliptical cross section. To do.
[0016]
According to a fourth aspect of the present invention, in the heat pump type hot water heater according to the third aspect, the first heat exchange pipe is spirally wound together with the second heat exchange pipe, and heat The second heat exchange pipe through which the medium flows is embedded along the wide direction of the flat elliptical shape in the first heat exchanger .
[0017]
[0018]
[0019]
[0020]
[0021]
[0022]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment] A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall schematic configuration diagram of a heat pump type hot water heater provided with a heat exchanger in one embodiment of the present invention, and FIG. 2 is a schematic diagram showing a refrigerant circulation circuit and a hot water supply circuit.
[0023]
1 and 2, a heat pump type hot water heater 10 includes a compressor 11, a refrigerant-to-water heat exchanger (hereinafter simply referred to as a heat exchanger) 12, a decompression device 13, and an evaporator 14. It has a refrigerant circuit A in which components are sequentially connected by refrigerant piping, a hot water storage tank 15, a circulation pump 16, and the heat exchanger 12, and these components are sequentially connected by hot water piping. It consists of a hot water supply circuit B. The compressor 11, the heat exchanger 12, the decompressor 13, the evaporator 14, the hot water storage tank 15, the circulation pump 16 and the like are accommodated in an outer case 17. In the heat exchanger 12, a second heat exchange pipe 12B described later is arranged in two parallel paths.
[0024]
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 a blower 19 for sending air to the evaporator 14 are provided in the upper chamber 17A. On the other hand, a heat exchanger 12, a hot water storage tank 15, a circulation pump 16 and the like are arranged in the lower chamber 17B.
[0025]
Reference numeral 20 denotes a pedestal as a bottom plate of the outer case 17, on which the heat exchanger 12 and the circulation pump 16 are placed and fixed, and the hot water storage tank 15 is placed and fixed via a support leg 15A.
[0026]
In the heat pump water heater 10 described above, superheated gas refrigerant such as high-temperature and high-pressure CO2 refrigerant discharged from the compressor 11 flows into the heat exchanger 12 and is sent from the circulation pump 16 here. Heat the water. The condensed and liquefied refrigerant is decompressed by the decompression device 13 and flows into the evaporator 14, where it absorbs atmospheric heat to evaporate and returns to the compressor 11. On the other hand, the hot water heated by the heat exchanger 12 flows into the upper part of the hot water storage tank 15 and is stored in the hot water storage tank 15, and the hot water stored in the hot water storage tank 15 is supplied to the use section as necessary. Is done.
[0027]
Next, the above-described heat exchanger 12 will be described in detail with reference to FIGS. FIG. 3 is a longitudinal sectional view of the heat exchanger, FIG. 4 is a side view of the first and second heat exchange pipes integrated with each other, and FIG. 5 is a main portion showing the first embodiment of the first heat exchange pipe. It is a longitudinal cross-sectional enlarged view.
[0028]
In FIG. 3, the heat exchanger 12 has a first heat exchange pipe 12A through which water (heat exchange liquid) sent from the circulation pump 16 flows, and a superheated gas refrigerant (heat medium) flows through the heat exchanger 12. The second heat exchange pipe 12B in the path is provided in a heat exchange relationship. That is, the first heat exchange pipe 12 </ b> A is continuously formed with two hollow portions 22 extending in the axial direction on the peripheral wall thereof, and the second heat exchange pipe 12 </ b> B is first in the hollow portion 22. The heat exchange pipe 12A and the heat exchange relationship are crimped and fixed.
[0029]
Here, the first heat exchange pipe 12A is made of, for example, a copper pipe having a thickness of about 1 mm and an outer diameter of about 12.7 mm, and the second heat exchange pipe 12B is made of the first heat exchange pipe 12B. The material is the same material as the exchange pipe 12A, for example, a copper pipe having a thickness of about 1.2 mm and an outer diameter of about 6 mm.
[0030]
As a processing method for embedding and integrating the second heat exchange pipe 12B with respect to the first heat exchange pipe 12A, a drawing process is used. That is, when the copper pipe constituting the first heat exchange pipe 12A is inserted into the drawing machine, two recesses 22 are formed on the peripheral wall of the copper pipe in the axial direction and at a predetermined interval. . After two copper pipes as the second heat exchange pipes 12B are inserted into the two hollow portions 22, the copper pipes constituting the first heat exchange pipes 12A are pressurized in the radial direction. Thus, the second heat exchange pipe 12B is interposed in the depressed portion 22 of the first heat exchange pipe 12A.
[0031]
As shown in FIG. 4, the first heat exchange pipe 12A, which has been drawn out as described above and embraced the second heat exchange pipe 12B, is reduced in diameter at both ends as shown in FIG. Then, after being deformed so as to have a flat elliptical shape over substantially the entire length excluding both ends, as shown in FIG. 3, it is spirally wound. And the heat exchanger 12 is formed in a substantially cylindrical shape as a whole shape.
[0032]
Thus, as shown in FIG. 3, the heat exchanger 12 formed in a substantially cylindrical shape is placed on the mount 20 of the outer case 17, and the fixing cover plate 23 is put on the upper end thereof. The lid plate 23 and the gantry 20 are fastened and fixed on the gantry 20 by being fastened by fastening tools 24 such as bolts and nuts. Reference numeral 25 is a heat insulating material covering the outer periphery of the heat exchanger 12.
[0033]
The heat exchanger 12 configured as described above is configured such that the second heat exchange pipe 12B through which the superheated gas refrigerant (heat medium) flows is embraced by the first heat exchange pipe 12A through which water (heat exchange liquid) flows. As the first heat exchange pipe 12A is spirally wound, the shape thereof is formed in a substantially cylindrical shape. Therefore, the two heat exchange pipes 2 and 3 are alternately stacked to be spirally wound. The first heat exchange pipe 12A and the second heat exchange pipe 12B can be made more compact than the conventional component (see FIG. 9), and the second heat exchange pipe can be formed without any gap between them. Since 12B is directly brought into contact with the first heat exchange pipe 12A, the heat of the second heat exchange pipe 12B is exchanged with water flowing through the first heat exchange pipe 12A with almost no waste. Heated to 90 ° C and heat exchange Efficiency is improved.
[0034]
Moreover, since both the heat exchange pipes 12A and 12B are made of copper pipes made of the same material metal, electrolytic corrosion occurs between the first heat exchange pipe 12A and the second heat exchange pipe 12B that are in contact with each other. There is no worry about the occurrence of corrosion, and corrosion and hole opening caused by electric corrosion can be prevented.
[0035]
Further, in the heat pump type water heater 10 provided with the heat exchanger 12 having the above-described configuration, the heat exchanger 12 can be made compact, so that the inside of the exterior case 17 can be efficiently used and the heat exchange efficiency between water and the refrigerant can be improved. Can be improved, and an efficient heat pump operation can be performed.
[0036]
[Second Embodiment] The second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a longitudinal sectional view of a main part of the first and second heat exchange pipes. The same components as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0037]
In the first embodiment described above, the two recesses 22 are formed on one end side of the first heat exchange pipe 12 </ b> A processed into a flat elliptical shape with a predetermined interval. The second heat exchange pipe 12B is crimped and fixed. However, in the second embodiment, as shown in FIG. 6, the depressions 22 are formed at positions facing each other in the first heat exchange pipe 31, respectively. The second heat exchange pipe 12B is crimped to the two hollow portions 22 in a crimped state. Thereafter, the first heat exchange pipe 31 is processed into a flat ellipse over substantially the entire length.
[0038]
The good urchin, at mutually opposing positions of the first heat exchange pipe 31, by providing the recess 22 to dispose the second heat exchange pipe 12B, the water in the recessed portion 22 surrounding the first heat exchange pipe 31 The flow is made smooth and the heat exchange efficiency of both heat exchange pipes 31 and 12B is improved. Thereby, the heat exchange efficiency of water and a refrigerant | coolant is improved, and efficient heat pump operation can be performed. And an efficient heat pump type water heater can be provided.
[0039]
Moreover, since both the heat exchange pipes 31 and 12B are made into the form which included the 2nd heat exchange pipe 12B in the 1st heat exchange pipe 31, and are formed in a flat ellipse shape, these both heat exchange pipes 31 and 12B The heat exchanger formed by spirally winding the layers alternately can be made more compact than the conventional components.
[0040]
[0041]
[0042]
[0043]
Third Embodiment Hereinafter, a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a longitudinal sectional view of a main part of the first and second heat exchange pipes. The same components as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0044]
In Fig. 7, the third embodiment, the first and second heat exchange pipe 34,12B the first embodiment, provided with a recess 35 extending along the axial direction on the peripheral wall between one of the recess portions 22 Is. By providing this recess 35 and reducing the capacity in the first heat exchange pipe 34 at a portion away from the recess 22, a large amount of water flowing in the first heat exchange pipe 34 flows around the recess 22. .
[0045]
Thereby, the heat exchange between both the heat exchange pipes 34 and 12B is promoted, and the heat exchange efficiency between water and the refrigerant can be improved. And an efficient heat pump type water heater can be provided.
[0046]
Moreover, since both the heat exchange pipes 31 and 12B are made into the form which included the 2nd heat exchange pipe 12B in the 1st heat exchange pipe 31, and are formed in a flat ellipse shape, these both heat exchange pipes 31 and 12B The heat exchanger formed by alternately stacking and spirally winding can be made more compact than conventional components.
[0047]
As mentioned above, although this invention was demonstrated based on three embodiment, this invention is not limited to this.
[0048]
In the first to third embodiments, copper pipes are used for the first heat exchange pipes 12A, 31, 32, 34 and the second heat exchange pipe 12B. However, both the heat exchange pipes 12A, 12B are copper alloy pipes. It may be a stainless steel pipe.
[0049]
In the present embodiment, the two second heat exchange pipes 12B are crimped and fixed along the axial direction of the peripheral wall of the first heat exchange pipe 12A, but the number of the second heat exchange pipes 12B to be crimped and fixed. Is not limited to two, and may be three or more.
[0050]
Furthermore, various alternatives, modifications, and variations are possible for those skilled in the art based on the above description, and various alternatives, modifications, and variations are included without departing from the spirit of the present invention.
[0051]
【The invention's effect】
As described above, the heat exchanger according to the present invention includes the first heat exchange pipe through which the heat exchange liquid flows and the second heat exchange pipe through which the heat medium flows, and the first heat exchange pipe. A plurality of the second heat exchange pipes are embedded in the peripheral wall along the axial direction, and the first heat exchange pipe through which the heat exchange liquid flows has a flat elliptical cross section. Not only can the equipment be made compact, but the heat of the second heat exchange pipe through which the heat medium flows can be exchanged without waste with the heat exchange liquid such as water flowing through the first heat exchange pipe, improving the heat exchange efficiency. In addition to being able to be a heat exchanger with high heat exchange performance , it can be stably fixed on the installation part, and can be made into a compact heat exchanger with reduced height dimensions .
[0052]
[0053]
[0054]
[0055]
[0056]
In addition, since the heat pump type hot water heater of the present invention includes the compact heat exchanger with high heat exchange efficiency according to claims 1 and 2, the size of the water heater itself can be made compact, Efficient heat pump operation can be performed.
[Brief description of the drawings]
FIG. 1 is an overall schematic configuration diagram of a heat pump type water heater provided with a heat exchanger according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing a refrigerant circulation circuit and a hot water supply circuit of a heat pump type hot water heater according to the present invention.
FIG. 3 is a longitudinal sectional view of a refrigerant-to-water heat exchanger showing an embodiment of a heat exchanger according to the present invention.
FIG. 4 is a side view of the first heat exchange pipe and the second heat exchange pipe in an integrated state according to the present invention.
FIG. 5 is a longitudinal sectional view of an essential part showing a first embodiment of a first heat exchange pipe according to the present invention.
FIG. 6 is a longitudinal sectional view of an essential part showing a second embodiment of the first heat exchange pipe according to the present invention.
FIG. 7 is a longitudinal sectional view of an essential part showing a third embodiment of the first heat exchange pipe according to the present invention.
FIG. 8 is a longitudinal sectional view of a refrigerant-to-water heat exchanger showing a conventional embodiment .
[Explanation of symbols]
10 Heat Pump Water Heater 11 Compressor 12 Refrigerant vs. Water Heat Exchanger (Heat Exchanger)
12A, 31, 32, 34 1st heat exchange pipe 12B 2nd heat exchange pipe 13 Depressurizer 14 Evaporator 15 Hot water storage tank 16 Circulation pump 17 Exterior case 22 Recessed portions 33, 35 of first heat exchange pipe

Claims (4)

A first heat exchange pipe through which a heat exchange liquid flows; and a second heat exchange pipe through which a heat medium flows; and a second wall of the first heat exchange pipe along the axial direction of the second heat exchange pipe. A heat exchanger, wherein a plurality of exchange pipes are embedded, and the first heat exchange pipe through which the heat exchange liquid flows has a flat elliptical cross section . The first heat exchange pipe is spirally wound together with the second heat exchange pipe, and the second heat exchange pipe through which the heat medium flows is embedded along the wide direction of the flat elliptical shape in the first heat exchanger. The heat exchanger according to claim 1, wherein the heat exchanger is provided. A first heat exchange pipe through which a heat exchange liquid flows; and a second heat exchange pipe through which a heat medium flows; and a second wall of the first heat exchange pipe along the axial direction of the second heat exchange pipe. A heat pump type hot water heater , wherein a plurality of exchange pipes are embedded, and the first heat exchange pipe through which the heat exchange liquid flows has a flat elliptical cross section . The first heat exchange pipe is spirally wound together with the second heat exchange pipe, and the second heat exchange pipe through which the heat medium flows is embedded along the wide direction of the flat elliptical shape in the first heat exchanger. The heat pump type water heater according to claim 3, wherein

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