JP3906814B2 - tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fill a clearance between an end surface of a divider member 23 and an inner wall face of an outer plate 22, thereby surely meandering the fluid in a tube. <P>SOLUTION: A clearance between an end surface of a divider member 23 and an inner wall surface of an outer plate 22 is filled by a spacer 25, and thus can be closed without matching the shape of an end part of the divider member 23 with that of an inner wall face of an elbow part 22a. Accordingly, it becomes possible to surely meander the fluid in the tube while suppressing the rise of the manufacturing cost price of the tube. <P>COPYRIGHT: (C)2004,JPO&amp;NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a tube formed by joining an outer plate press-molded with a fluid meandering inside and having a substantially concave (bathtub) cross-sectional shape, for heating hot water. It is effective when applied to water tubes of heat exchangers.
[0002]
[Problems to be solved by the prior art invention]
As a heat exchanger for a heat pump type water heater for exchanging heat between hot water and refrigerant, the inventor joined two outer plates press-molded in a substantially concave (bathtub) cross-sectional shape, A water-side tube that has meandering the hot-water supply water passage and a thin-walled refrigerant-side tube are joined by partitioning the space formed between the outer plates with a partition plate, and heat exchange is performed between the hot-water supply and the refrigerant in a counterflow state. Developed what to do.
[0003]
9 is a schematic view of a water-side tube developed by the inventor. FIG. 10 is a cross-sectional view taken along the line AA in FIG. 9. As shown in FIG. 10, the outer plate 22 has a cross-sectional shape formed by press molding. Since the shape is substantially concave (bathtub), the inner wall surface of the bent portion 22a necessarily becomes a curved surface having a predetermined radius of curvature.
[0004]
On the other hand, the end surface of the partition plate 23 has a corner portion cut at about 90 °, and therefore, between the end surface of the partition plate 23 and the inner wall surface of the outer plate 22, it corresponds to the radius of curvature of the bent portion 22a. A gap having dimensions is generated.
[0005]
And, if there is a gap between the end face of the partition plate and the inner wall surface of the outer plate, the hot water flows without meandering, so that the hot water and the refrigerant can exchange heat in an orthogonal counterflow state. The heat exchange efficiency between the hot water supply and the refrigerant is reduced.
[0006]
In addition, as shown in FIG. 5, the partition plate 23 according to the developed product is formed by forming a plurality of groove portions 24a forming a meandering path by press-forming the plate material so that the cross-sectional shape is a substantially rectangular wave shape. In addition, since the partition plate is positioned so that the end portion of the partition plate is in contact with the bent portion of the outer plate, the manufacturing variation of the dimension of the part parallel to the longitudinal direction of the groove portion among the outer dimensions of the partition plate is large. If it becomes, the clearance gap formed between the end surface of a partition plate and the inner wall face of an outer plate will also have the problem that it will become large.
[0007]
In view of the above, the present invention firstly provides a novel tube that is different from the conventional one, and secondly, it is intended to meander the fluid reliably in the tube.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in the invention according to claim 1, two outer plates (22) in which the fluid meanders inside and at least one of the cross-sectional shapes is press-formed into a substantially concave shape. Are arranged in a space formed between two outer plates (22), and constitute a meandering path (24) through which fluid flows so as to partition the space. It has a partition member (23) and a spacer (25) that fills a gap between the end surface of the partition member (23) and the inner wall surface of the outer plate (22).
[0009]
Thus, the gap between the end surface of the partition member (23) and the inner wall surface of the outer plate 22 is closed without making the end portion of the partition member (23) match the inner wall shape of the outer plate (22). Therefore, the fluid can be surely meandered in the tube while suppressing an increase in the manufacturing cost of the tube.
[0010]
In the invention according to claim 2, the partition member (23) has a plurality of grooves (24a) forming a part of the meander path (24) formed in parallel, and further, a spacer (25). Is a strip-like one extending in a direction substantially perpendicular to the longitudinal direction of the groove (24a).
[0011]
The invention according to claim 3 is characterized in that a plurality of grooves (24a) are formed by press-molding a plate material into a wave shape.
[0012]
The invention according to claim 4 is characterized in that the two outer plates (22), the partition member (23), and the spacer (25) are joined by brazing.
[0013]
Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
In this embodiment, the present invention is applied to a water tube of a heat exchanger for heating for heating hot water. FIG. 1 is a heat pump type water heater, and FIG. 2 is a tube according to this embodiment. It is the external appearance perspective view of the water refrigerant | coolant heat exchanger 20 which heat-exchanges with the hot-water supply water and refrigerant | coolant which used NO.
[0015]
As shown in FIG. 1, the heat pump water heater is a decompressor for reducing the refrigerant flowing out of the compressor 10, the water refrigerant heat exchanger 20, and the water refrigerant heat exchanger 20 that sucks and compresses the refrigerant. The decompressor 30 that absorbs heat from the outside air and evaporates the refrigerant, and the refrigerant that has flowed out of the evaporator 40 is separated into a liquid-phase refrigerant and a gas-phase refrigerant, and excess refrigerant is stored as a liquid-phase refrigerant. It is composed of a gas-liquid separator 50 or the like that supplies phase refrigerant to the compressor 10, and heats the hot water supply by supplying the hot water with heat absorbed from the outside air and heat corresponding to the compression work of the compressor 10. To do.
[0016]
Next, the structure of the water refrigerant heat exchanger 20 will be described.
[0017]
As shown in FIG. 3, the water-side tube 21 of the water-refrigerant heat exchanger 20 joins two outer plates 22 press-molded into a substantially concave (bathtub) cross section, as shown in FIG. 4. In addition, in the present embodiment, the outer plate 22 and the partitioning member 23 are configured to meander the hot water supply passage, that is, the meandering passage 24, which is meandered by partitioning the space formed between the two outer plates 22 by the partitioning member 23. Are made of metal (for example, copper or stainless steel) having excellent corrosion resistance, and these are joined by brazing.
[0018]
Note that “brazing” refers to a technique for joining so as not to melt the base material using brazing material or solder, as described in, for example, “connection / joining technology” (Tokyo Denki University Press). . Incidentally, when joining using a filler material having a melting point of 450 ° C. or higher is called brazing, the filler material at that time is called brazing material, and when joining using a filler material having a melting point of 450 ° C. or less. Is called soldering, and the filler material at that time is called solder.
[0019]
Incidentally, in this embodiment, both the thickness of the outer plate 22 and the partition member 23 are set to about 0.5 mm, the both 22 and 23 are brazed to a foil-like phosphor copper filler material, and the outer plates 22 are also foil-like. Although it is brazed to the phosphor copper filler material, for example, a rod-like filler material may be disposed at a predetermined location.
[0020]
Further, as shown in FIG. 5, the partition member 23 is formed by forming a plurality of groove portions 24a constituting a part of the meandering path 24 by press-molding a plate material into a substantially rectangular wave shape, and adjacent groove portions 24a. Communicates via the communication path 24b.
[0021]
Incidentally, in this embodiment, the partition member 23 is made of metal, so that it also has an effect as a fin that increases the heat transfer area between the hot water supply water and the water side tube 21.
[0022]
The gap between the end surface of the partition member 23 and the inner wall surface of the outer plate 22 is filled with a spacer 25 as shown in FIG. The spacer 25 is in the form of a strip extending in a direction substantially orthogonal to the longitudinal direction of the plurality of groove portions 24 a arranged in parallel, and the thickness of the spacer 25 is the inner wall side of the bent portion 22 a of the outer plate 22. The dimension is set to be approximately equal to the radius of curvature.
[0023]
At this time, since the spacer 25 has a rectangular cross-sectional shape, strictly speaking, the spacer 25 alone cannot close the gap between the end face of the partition member 23 and the inner wall surface of the outer plate 22, but the size of the remaining gap is Since it is sufficiently small, the remaining gap can be filled with the filler material at the time of brazing.
[0024]
By the way, in this embodiment, since the discharge pressure of the compressor 10 is made more than the critical pressure of a refrigerant | coolant, when a refrigerant | coolant and hot water supply heat-exchange with the water refrigerant | coolant heat exchanger 20, a refrigerant | coolant does not condense. Since the enthalpy is lowered while lowering the temperature, as shown in FIG. 2, a plurality of (three in this embodiment) narrow tubes are formed so that the refrigerant flow and the hot water flow are opposed to each other. The refrigerant tubes 26 are bundled into one, and the bundled refrigerant tubes 26 are brazed to the outer plate 22 in a state of being wound around the water-side tube 21 in a coil shape.
[0025]
In the present embodiment, the refrigerant tube 26 is made of phosphorous deoxidized copper in a coil shape by a roller molding machine, and is soldered to the water-side tube 21, that is, the outer plate 22 with a filler metal of phosphorous copper. ing.
[0026]
Next, the effect of this embodiment is described.
[0027]
In the present embodiment, since the gap between the end surface of the partition member 23 and the inner wall surface of the outer plate 22 is filled with the spacer 25, the end portion of the partition member 23 is not shaped to match the inner wall shape of the bent portion 22a. A gap between the end surface of the partition member 23 and the inner wall surface of the outer plate 22 can be closed.
[0028]
Therefore, the hot water can be surely meandered in the water-side tube 21, and the heat exchange efficiency between the hot water and the refrigerant can be increased.
[0029]
(Second Embodiment)
In the above-described embodiment, the present invention is applied to the water-side tube 21 of the water-refrigerant heat exchanger 20 that exchanges heat between the refrigerant and the hot water supply. However, as shown in FIG. The present invention is applied to a heat exchanger in which two tubes 28 having a similar structure are bonded together.
[0030]
Specifically, warm water is allowed to flow through one tube 28 having a structure similar to that of the water-side tube 21, and cold water is allowed to flow opposite to the warm water through the other tube 28 having a structure similar to that of the water-side tube 21. The present invention is applied to a heat exchanger that flows as described above.
[0031]
Incidentally, the communication path 24b of the partition member 23 according to the present embodiment is configured by a hole as shown in FIG. 7, but the communication path 24b is configured by a notch hole as in the first embodiment. Needless to say.
[0032]
(Other embodiments)
In the above-described embodiment, the partition member 23 is formed by pressing the plate material in a rectangular wave shape. However, the present invention is not limited to this, and for example, a U-shaped cross section or an eye-shaped cross section is formed. You may form the partition member 23 with the extrusion or drawing material which has.
[0033]
In the above-described embodiment, the two outer plates 22 are both formed in a bathtub shape. However, the present invention is not limited to this. For example, the outer plate 22 on one side has a bathtub shape, and the other side is a flat plate. It is good also as a shape.
[0034]
In the above-described embodiment, the refrigerant tube 26 is wound around the water-side tube 21 in a coil shape. However, the present invention is not limited to this. For example, as shown in FIG. It is good also as a thin tube extended in the direction parallel to.
[0035]
Note that a refrigerant tank 27 communicating with the refrigerant tubes 26 is provided at both longitudinal ends of the plurality of refrigerant tubes 26, and the refrigerant tank 27 provided on the outlet side (upper side of the paper surface) of hot water is The refrigerant is distributed and supplied to the plurality of refrigerant tubes 26, and the refrigerant tank 27 provided on the inlet side of the hot water supply (the lower side in the drawing) collects and recovers the refrigerant flowing out of the plurality of refrigerant tubes 26. is there.
[Brief description of the drawings]
FIG. 1 is a schematic view of a heat pump type water heater according to an embodiment of the present invention.
FIG. 2 is an external perspective view of the water refrigerant heat exchanger according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view of a water-side tube according to the first embodiment of the present invention.
FIG. 4 is a conceptual diagram of a water-side tube according to the first embodiment of the present invention.
FIG. 5 is a perspective view of a partition member according to the first embodiment of the present invention.
FIG. 6 is an external perspective view of a water refrigerant heat exchanger according to a second embodiment of the present invention.
FIG. 7 is a perspective view of a partition member according to a second embodiment of the present invention.
FIG. 8 is an external perspective view of a water refrigerant heat exchanger according to another embodiment of the present invention.
FIG. 9 is a conceptual diagram of a water-side tube according to a prototype study.
10 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
21 ... Tube, 22 ... Outer plate, 23 ... Partition member, 25 ... Spacer.

Claims (4)

A tube is formed by joining two outer plates (22) in which a fluid meanders inside and at least one of the cross-sectional shapes is press-molded into a substantially concave shape,
A partition member (23) which is disposed in a space formed between the two outer plates (22) and forms a meandering path (24) through which fluid flows so as to partition the space;
A tube comprising a spacer (25) that fills a gap between an end surface of the partition member (23) and an inner wall surface of the outer plate (22). The partition member (23) has a plurality of groove portions (24a) forming a part of the meander path (24) formed in parallel.
Furthermore, the said spacer (25) is a strip | belt-shaped thing extended in the direction substantially orthogonal to the longitudinal direction of the said groove part (24a), The tube characterized by the above-mentioned. The tube according to claim 2, wherein the plurality of grooves (24a) are formed by press-molding a plate material into a wave shape. The tube according to any one of claims 1 to 3, wherein the two outer plates (22), the partition member (23), and the spacer (25) are joined by brazing. .

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