JP2003014382A - Heat exchanger, and heat pump type hot water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact heat exchanger with high heat exchange efficiency, and further provide a heat pump type hot water heater where a highly effectual heat pump operation is achieved. SOLUTION: There are provided a first heat exchange pipe 12A in which a fluid to be heat exchanged flows, and a second heat exchange pipe 12B in which a heat medium flows. The heat exchange pipe 12A includes a recessed portion 22 extending axially on a peripheral wall thereof, and in the recessed portion 22 the second heat exchange pipe 12B are fixed in a heat exchange relation with the first heat exchange pipe 12A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger and a heat pump type water heater.

[0002]

2. Description of the Related Art Generally, in a heat pump type hot water supply apparatus of this type, as described in Japanese Patent Laid-Open No. 2001-116357, a heat exchanger for refrigerant and water is used to generate heat and water of 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.
7, 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 In order to exchange heat with each other, the layers are alternately stacked and wound in a spiral shape, and are configured so that the entire shape is substantially cylindrical.

The lower end side of the heat exchanger 1 is placed on, for example, the bottom plate 4 of the outer case of the heat pump type 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 fixed in the outer case by using a fixture 6 such as a bolt and a nut.

By the way, in the above-described conventional refrigerant-to-water heat exchanger 1, the first and second heat exchange pipes 2 and 3 are used.
In order to increase the contact area of the two heat exchange pipes 2, 3
Although the heat exchange pipes 2 and 3 are alternately superposed on each other even though the longitudinal cross-sectional shape thereof is formed into a flat elliptical shape, when the number of windings is increased to increase the heat exchange rate, the heat exchanger 1
There was a problem in that the height of the machine became high and the machine became large.

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 2 flows. The heat exchange pipe 3 is generally made of aluminum or aluminum alloy. As described above, when the first heat exchange pipe 2 and the second heat exchange pipe 3 which are in contact with each other are made of different metals, electrolytic corrosion is caused due to the different metals, so that the heat exchange pipe made of aluminum or aluminum alloy is not used. It was necessary to prevent galvanic corrosion by applying surface treatment such as painting or alumite treatment.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is possible to provide a compact heat exchanger having a high heat exchange efficiency and a high efficiency. The main purpose of the present invention is to provide a heat pump type water heater that can perform heat pump operation.

[0008]

According to a first aspect of the present invention, there is provided a first heat exchange pipe in which a liquid to be heat exchanged flows, and a second heat exchange pipe in which a heat medium flows. The first heat exchange pipe has a recess portion extending in the axial direction on the peripheral wall of the first heat exchange pipe, and the second heat exchange pipe is crimp-fixed in the recess portion in a heat exchange relationship with the first heat exchange pipe. It has a structure.

The invention relating to the heat exchanger according to claim 2 is
A first heat exchange pipe in which a liquid to be heat-exchanged flows and a second heat exchange pipe in which a heat medium flows are provided inside, and the first heat exchange pipe has a recess portion extending along an axial direction in a peripheral wall thereof. The second heat exchange pipe is press-fitted and fixed in a heat exchange relationship with the first heat exchange pipe in the recess, and
The first heat exchange pipe has a non-circular cross section.

The invention relating to the heat exchanger according to claim 3 is
A first heat exchange pipe in which a liquid to be heat-exchanged flows and a second heat exchange pipe in which a heat medium flows are provided inside, and the first heat exchange pipe has a recess portion extending along an axial direction in a peripheral wall thereof. The second heat exchange pipe is press-fitted and fixed in a heat exchange relationship with the first heat exchange pipe in the recess, and
The first heat exchange pipe has a non-circular cross section and is spirally wound.

The invention according to claim 4 is the invention according to claims 1 to 3.
In the heat exchanger described in the paragraph 1, the first heat exchange pipe and the second heat exchange pipe are made of the same metal material.

The invention according to claim 5 is the invention as claimed in claims 1 to 3.
The heat exchanger according to claim 1, wherein the first heat exchange pipe and the second heat exchange pipe
The heat exchange pipe is made of copper or copper alloy.

The invention relating to the heat pump type hot water supply apparatus according to claim 6 includes a first heat exchange pipe through which hot and cold water flows,
A heat exchanger for refrigerant to water, which comprises a second heat exchange pipe through which a refrigerant flows, is provided, wherein the first heat exchange pipe has a recessed portion extending in the axial direction on the peripheral wall thereof, and in the recessed portion. The second heat exchange pipe and the first heat exchange pipe are pressure-bonded and fixed in a heat exchange relationship.

The invention relating to the heat pump type hot water supply apparatus according to claim 7 includes a first heat exchange pipe through which hot and cold water flows,
A heat exchanger for refrigerant to water, which comprises a second heat exchange pipe through which a refrigerant flows, is provided, wherein the first heat exchange pipe has a recessed portion extending in the axial direction on the peripheral wall thereof, and in the recessed portion. The second heat exchange pipe is crimped and fixed in a heat exchange relationship with the first heat exchange pipe, and the first heat exchange pipe has a non-circular cross section.

The invention relating to the heat pump type hot water supply apparatus according to claim 8 is a first heat exchange pipe through which hot and cold water flows,
A heat exchanger for refrigerant to water, which comprises a second heat exchange pipe through which a refrigerant flows, is provided, wherein the first heat exchange pipe has a recessed portion extending in the axial direction on the peripheral wall thereof, and in the recessed portion. A configuration in which the second heat exchange pipe is crimped and fixed to the first heat exchange pipe in a heat exchange relationship, and the first heat exchange pipe has a non-circular cross section and is spirally wound. Is.

The invention according to claim 9 is the invention according to claims 6 to 8.
In the heat pump type hot water supply apparatus as described in [1], the first heat exchange pipe and the second heat exchange pipe are made of the same metal material.

According to a tenth aspect of the present invention, in the heat pump water heater according to the sixth to eighth aspects, the first heat exchange pipe and the second heat exchange pipe are made of copper or a copper alloy. .

[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.

In FIG. 1 and FIG. 2, a heat pump type water heater 10 comprises a refrigerant circulation circuit A comprising a compressor 11, a heat exchanger 12 for refrigerant to water, a pressure reducing device 13 and an evaporator 14, a hot water storage tank 15 and a circulation. The compressor 16 comprises a pump 16 and a hot water supply circuit B to which the refrigerant-to-water heat exchanger 12 is connected.
1, heat exchanger 12 for refrigerant to water, pressure reducing device 13, evaporator 1
4, 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 the upper chamber 17A has a compressor 11, an evaporator 14 and air blown to the evaporator 14. A blower 19 and the like are arranged, 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 frame as a bottom plate of the outer case 17, on which the heat exchanger 12 for refrigerant and water and the circulation pump 16 are mounted and fixed, and the hot water storage tank 15 is mounted via the supporting legs 15A. It is fixed.

In the heat pump type water heater 10 described above,
The superheated gas refrigerant such as high-temperature and high-pressure CO2 refrigerant discharged from the compressor 11 flows into the refrigerant-to-water heat exchanger 12 and heats the water sent from the circulation pump 16. 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, and the hot water storage tank 15
The hot water stored in the hot water storage tank 15 is supplied to the utilization unit as needed.

Next, the refrigerant-to-water heat exchanger (heat exchanger) 12 will be described in detail with reference to FIGS. 3 to 5. Figure 3
Is a vertical cross-sectional configuration diagram of the refrigerant-to-water heat exchanger, FIG. 4 is a side view of the first heat exchange pipe and the second heat exchange pipe in a state of being integrated with each other, and FIG. 5 is a state of being processed into a flat elliptical shape. FIG. 3 is an enlarged view of a longitudinal section of a main part of the first heat exchange vip of FIG.

In FIG. 3, the refrigerant-to-water heat exchanger 1 is shown.
Reference numeral 2 denotes a first heat exchange pipe 12A in which water (heat exchange liquid) sent from the circulation pump 16 flows, and a second heat exchange pipe 12B in which a superheated gas refrigerant (heat medium) flows.
And are provided in a heat exchange relationship. That is, in the first heat exchange pipe 12A, a single recess 22 extending in the axial direction is continuously formed on the peripheral wall of the first heat exchange pipe 12A.
The second heat exchange pipe 12B is pressure-fixed in the second heat exchange pipe 12A in a heat exchange relationship with the first heat exchange pipe 12A.

Here, the first heat exchange pipe 12A is
For example, a copper pipe having a thickness of about 1 mm and an outer diameter of about 20 mm is used as a material, and the second heat exchange pipe 12B is
The first heat exchange pipe 12A is made of the same material, for example, a copper pipe having a thickness of about 0.6 mm and an outer diameter of about 6 mm.

As a processing method for hugging and integrating the second heat exchange pipe 12B with the first heat exchange pipe 12A, a drawing process is used. That is, when the copper pipe forming the first heat exchange pipe 12A is inserted into the drawing machine, a recess 22 is continuously formed in the peripheral wall of the copper pipe in the axial direction, and the second heat exchange is performed in the recess 22. After the copper pipe as the pipe 12B is inserted, the copper pipe forming the first heat exchange pipe 12A is radially pressed. Thus, the recess 22 of the first heat exchange pipe 12A
The second heat exchange pipe 12B is interposed in the inside in a pressure-bonded state.

As shown in FIG. 4, both ends of the first heat exchange pipe 12A, which has been drawn out as described above and in which the second heat exchange pipe 12B is held, are reduced in diameter, and as shown in FIG. As shown in FIG. 3, after being deformed into a flat elliptical shape over substantially the entire length excluding both ends, as shown in FIG. 3, it is spirally wound and formed into a substantially cylindrical shape as a whole. It

As shown in FIG. 3, the heat exchanger 12 for refrigerant and water, which is formed into a substantially cylindrical shape, has the exterior case 1 as described above.
7 is mounted on the pedestal 20 and the fixing lid plate 2 is attached to the upper end.
3 is covered, and the fixing lid plate 23 and the gantry 20 are fastened to each other by fastening tools 24 such as bolts and nuts. Reference numeral 25 is a heat insulating material that covers the outer periphery of the refrigerant-to-water heat exchanger 12.

The refrigerant-to-water heat exchanger 12 configured as described above is configured such that the second heat exchange pipe 12B in which the superheated gas refrigerant (heat medium) flows is passed through the first heat exchange in which water (heat exchange liquid) flows. The first heat exchange pipe 12A is wound around the pipe 12A in a spiral shape so that the first heat exchange pipe 12A is formed into a substantially cylindrical shape. Not only can it be made more compact than the conventional component that is wound into a shape, but also the first heat exchange pipe 1
2A and the second heat exchange pipe 12B are in direct contact with each other in a form in which the second heat exchange pipe 12B is embraced by the first heat exchange pipe 12A without forming a gap between them,
The heat of the second heat exchange pipe 12B is the first heat exchange pipe 12A.
Almost no waste of heat is exchanged with the water flowing inside, and the water is about 9
It is heated to 0 ° C and heat exchange efficiency is improved.

Also, the heat exchange pipes 12A and 12B described above.
Since copper pipes of the same material are used, there is no concern that electrolytic corrosion will occur between the first heat exchange pipe 12A and the second heat exchange pipe 12B that are in contact with each other, and It can prevent corrosion and piercing.

Further, the refrigerant-to-water heat exchanger 12 having the above structure.
In the heat pump water heater 10 including the heat exchanger 12 for cooling water, the heat exchanger 12 for refrigerant can be made compact, so that the inside of the outer case 17 can be efficiently used, and the heat exchange efficiency between water and the refrigerant can be improved. Good heat pump operation.

FIG. 6 shows another embodiment of the heat exchanger 12 for refrigerant-to-water. In the above-described embodiment, the second heat exchange pipe 12A through which the superheated gas refrigerant flows passes through the second heat exchange pipe 12A through which the water flows. The first heat exchange pipe 12A is embraced so as to be located in the central portion of the upper side of the first heat exchange pipe 12A, but as shown in FIG. 6, the second heat exchange through which the superheated gas refrigerant flows. The pipe 12A may be embraced by the first heat exchange pipe 12A so as to be located in the substantially central portion on the inner side in the first heat exchange pipe 12A through which water flows.

In this embodiment, the first heat exchange pipe 1
Although the copper pipes are used for the 2A and the second heat exchange pipes 12B, both the heat exchange pipes 12A and 12B may be copper alloy pipes or stainless pipes.

Further, although the embodiment of the present invention has 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 are possible without departing from the gist of the present invention. It is intended to include examples, modifications or variations.

[0035]

As described above, according to the first aspect of the present invention.
In the heat exchanger according to the first aspect, the first heat exchange pipe in which the liquid to be exchanged flows and the second heat exchange pipe in which the heat medium flows are provided in a heat exchange relationship, and the first heat exchange pipe is The peripheral wall has a recess extending in the axial direction, and the second heat exchange pipe is crimp-fixed in the recess in a heat exchange relationship with the first heat exchange pipe. Second, the heat medium flows not only
The heat of the heat exchange pipe is efficiently exchanged with the heat exchanged heat liquid such as water flowing in the first heat exchange pipe, resulting in a compact heat exchanger with improved heat exchange efficiency and high heat exchange performance. Let

Further, in the heat exchanger according to the second aspect, the first heat exchange pipe through which the liquid to be heat exchanged flows and the second heat exchange pipe through which the heat medium flows inside are provided in a heat exchange relationship, The first heat exchange pipe has a recess extending in the axial direction on the peripheral wall of the first heat exchange pipe, and the second heat exchange pipe is crimped and fixed in a heat exchange relationship with the first heat exchange pipe in the recess.
Moreover, since the first heat exchange pipe has a non-circular cross-section, the heat exchanger is more compact and has high heat exchange efficiency in addition to the effect according to claim 1. Can be done.

Further, in the heat exchanger according to the third aspect, the first heat exchange pipe in which the liquid to be heat exchanged flows and the second heat exchange pipe in which the heat medium flows are provided in a heat exchange relationship. The first heat exchange pipe has a recessed portion extending along the axial direction on the peripheral wall thereof, and the second heat exchange pipe is pressure-fixed in the recessed portion in a heat exchange relationship with the first heat exchange pipe, Moreover, since the first heat exchange pipe has a non-circular cross-section and is wound in a spiral shape, in addition to the effect according to claim 1 and 2, the first heat exchange pipe is stable on the installation portion. Can be fixed to.

Further, the heat pump type hot water supply apparatus according to claim 6 is a heat exchanger in which a first heat exchange pipe through which hot water flows and a second heat exchange pipe through which a refrigerant flows are provided in a heat exchange relationship. The first heat exchange pipe has a recess portion extending in the axial direction on the peripheral wall of the first heat exchange pipe, and the second heat exchange pipe is crimp-fixed in the recess portion in a heat exchange relationship with the first heat exchange pipe. With this configuration, the heat exchanger for refrigerant and water can be made compact, and the heat exchange efficiency between water and the refrigerant can be improved, and efficient heat pump operation can be performed.

A heat pump type hot water supply apparatus according to a seventh aspect of the present invention is a heat exchanger for refrigerant and water comprising a first heat exchange pipe through which hot water flows and a second heat exchange pipe through which a refrigerant flows inside. The first heat exchange pipe has a recess portion extending in the axial direction on the peripheral wall of the first heat exchange pipe, and the second heat exchange pipe is pressure-fixed in the recess portion in a heat exchange relationship with the first heat exchange pipe. Since the first heat exchange pipe has a non-circular cross-section, in addition to the effect of claim 6, it is more compact and
It is possible to provide a heat pump water heater including a heat exchanger having high heat exchange efficiency.

Further, the heat pump type hot water supply apparatus according to the present invention comprises a heat exchanger for refrigerant-to-water, comprising a first heat exchange pipe through which hot water flows and a second heat exchange pipe through which a refrigerant flows inside. The first heat exchange pipe has a recess portion extending in the axial direction on the peripheral wall of the first heat exchange pipe, and the second heat exchange pipe is pressure-fixed in the recess portion in a heat exchange relationship with the first heat exchange pipe. In addition, since the first heat exchange pipe has a non-circular cross section and is wound in a spiral shape, in addition to the effects according to claims 6 and 7, It is possible to stably fix the heat exchanger on the installation part.

[Brief description of drawings]

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

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

FIG. 3 is a vertical cross-sectional view of a heat exchanger for refrigerant and water 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 an enlarged longitudinal cross-sectional view of a main part of the first heat exchange vip in a state of being processed into a flat elliptical shape.

FIG. 6 is a vertical cross-sectional view of a heat exchanger for refrigerant and water showing another embodiment of the present invention.

FIG. 7 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 22 Depression of the first heat exchange pipe

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhiko Harima             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Shigaya Ishigaki             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Masanobu Masanobu             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Chiaki Shichiji             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Kiyoshi Koyama             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Sadahiro Takizawa             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation F-term (reference) 3L103 AA05 AA37 BB43 CC02 CC30                       DD05 DD09 DD36

Claims (10)

[Claims] 1. A first heat exchange pipe in which a liquid to be heat exchanged flows, and a second heat exchange pipe in which a heat medium flows, wherein the first heat exchange pipe is axially arranged on a peripheral wall of the first heat exchange pipe. A heat exchanger characterized in that the second heat exchange pipe is crimped and fixed in a heat exchange relationship with the first heat exchange pipe in the hollow portion. 2. A first heat exchange pipe in which a liquid to be heat exchanged flows, and a second heat exchange pipe in which a heat medium flows. The first heat exchange pipe has a recessed portion extending along the axial direction on the peripheral wall thereof, and the second heat exchange pipe is pressure-fixed in the recessed portion in a heat exchange relationship with the first heat exchange pipe, The first heat exchange pipe has a non-circular cross section. 3. A first heat exchange pipe in which a liquid to be heat exchanged flows, and a second heat exchange pipe in which a heat medium flows, wherein the first heat exchange pipe is axially arranged on a peripheral wall of the first heat exchange pipe. The second heat exchange pipe is crimped and fixed in a heat exchange relationship with the first heat exchange pipe, and the first heat exchange pipe has a non-circular cross section. And a spirally wound configuration. 4. The heat exchanger according to claim 1, wherein the first heat exchange pipe and the second heat exchange pipe are made of the same metal. 5. The heat exchanger according to claim 1, wherein the first heat exchange pipe and the second heat exchange pipe are made of copper or a copper alloy. 6. A refrigerant-to-water heat exchanger comprising a first heat exchange pipe through which hot water flows and a second heat exchange pipe through which a refrigerant flows, the first heat exchange pipe having a peripheral wall thereof. A heat pump water heater having a hollow portion extending in the axial direction, and the second heat exchange pipe is press-fitted and fixed in a heat exchange relationship with the first heat exchange pipe in the hollow portion. 7. A heat exchanger for refrigerant-to-water comprising a first heat exchange pipe through which hot water flows and a second heat exchange pipe through which a refrigerant flows, wherein the first heat exchange pipe has a peripheral wall thereof. Has a recess extending in the axial direction, the second heat exchange pipe is crimped and fixed in a heat exchange relationship with the first heat exchange pipe in the recess, and the first heat exchange pipe has a cross section. Is a non-circular shape, a heat pump water heater. 8. A heat exchanger for refrigerating water, comprising a first heat exchange pipe through which hot water flows, and a second heat exchange pipe through which a refrigerant flows, wherein the first heat exchange pipe has a peripheral wall thereof. Has a recess extending in the axial direction, the second heat exchange pipe is crimped and fixed in a heat exchange relationship with the first heat exchange pipe in the recess, and the first heat exchange pipe has a cross section. Has a non-circular shape and is wound in a spiral shape. 9. The heat pump water heater according to claim 6, wherein the first heat exchange pipe and the second heat exchange pipe are made of the same metal. 10. The heat pump type water heater according to claim 6, wherein the first heat exchange pipe and the second heat exchange pipe are made of copper or copper alloy.