JP3935661B2 - Plate heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a plate heat exchanger formed by overlapping a plurality of dish-shaped plates.
[0002]
[Prior art]
In general, a plurality of plate-shaped plates are stacked to form a plurality of flow paths through which at least two types of fluid can flow, and plate-type heat exchange is configured to enable heat exchange between the fluids flowing through the flow paths. The vessel is known.
[0003]
In general, this kind of fluid does not leak to the outside through the two fluid flow paths, and the fluids are not mixed inside, excellent in heat exchange performance, low initial cost, etc. Is required.
[0004]
In the conventional plate heat exchanger, (1) a structure in which a gasket is sandwiched between the plates, (2) a structure in which the plates are brazed, (3) a structure in which the plates are welded, etc. A form is proposed.
[0005]
[Problems to be solved by the invention]
However, when the heat exchanger configured as described above is used for an absorption refrigerator, for example, in (1), it cannot be used in a vacuum, and in (2), the heat exchanger of the absorption refrigerator is increased in size. However, there are problems such as an increase in the size, a processing cost is increased, and an initial cost is increased.
[0006]
Further, in (3), when the plates are enlarged, there is a problem that it becomes difficult to perform welding and joining the plates.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a plate heat exchanger that eliminates the above-described problems of the prior art and can reduce the welding work between the plates in manufacturing.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, the peripheral portions of two adjacent plate-shaped plates are wound together , and an inclined portion having a predetermined angle is provided on the peripheral portions that are tightened to form one element. In addition to overlapping the inclined portions of these elements, a predetermined interval is provided in advance between the peripheral edge portion of one element that has been tightened and the peripheral edge portion of the other element that has been tightened. By joining the peripheral portions of each element and forming a plurality of flow paths through which at least two types of fluid can flow, and heat exchange between the fluid flowing through the respective flow paths is configured. The through-hole peripheral wall of the plate is raised in a trumpet shape to form an annular portion there, and an annular groove is formed in the outer peripheral wall of the base, and the tip of the annular portion is positioned on the bank of the annular groove. As to this annular portion fitted to the inner circumferential die to the, characterized in that a welded between the tip of the bank portion and the annular portion of the annular groove.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, a sealing material is interposed between the peripheral portions, and the peripheral portions where the sealing material is interposed are wound and processed. The element is formed .
[0012]
The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2 , each of the plates has a communication hole, and the communication holes of adjacent plates are bonded together by a ring-shaped bonding member .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0017]
In FIG. 1, the code | symbol 1 has shown the comparatively large plate type heat exchanger suitable for using, for example in an absorption refrigerator.
[0018]
As shown in FIG. 2, the plate heat exchanger 1 is configured by stacking a plurality of plate-shaped SPCC plates (for example, a thickness t = 0.5 mm) 3. Each plate 3 is formed with wave-shaped (herringbone) irregularities not shown by press molding.
[0019]
This unevenness is located between the plates, protrudes into the flow path, and generates turbulent flow in the flow path, thereby increasing the heat exchange efficiency.
[0020]
This wave shape is formed by sandwiching a special plate material in a precision mold and drawing with a press.
[0021]
In the present embodiment, two adjacent plates 3 are overlapped, and peripheral portions 3a including all of the long and short sides are joined together by winding as shown in FIGS. 3a and 3b. One element 10 is formed.
[0022]
In order to improve the sealing performance between the peripheral portions 3a by the tightening, as shown in FIGS. 4a and 4b, a seal material 9 is applied between the peripheral portions 3c, and the peripheral portion to which the seal material 9 is applied is applied. One element 10 can be formed by winding 3c together.
[0023]
The sealing material 9 is required to have temperature resistance, pressure resistance, and the like. In particular, in the case of an absorption refrigerator, LiBr liquid resistance is required.
[0024]
Accordingly, in selecting it, for example, a silicone-based or fluorine-based sealing material is suitable.
[0025]
In the element 10, an inclined portion 3 c having an angle (θ) of 2 to 15 ° is provided near the peripheral edge portion 3 a that has been tightened, as shown in FIG. 5. And when overlapping another element 10B on this element 10A, the inclination angle of the inclination part 3c is match | combined, and the peripheral part is crimped | bonded and joined by overlapping each other inclination part 3c.
[0026]
In order to improve the adhesion, a predetermined interval S is provided in advance between the winding portion 3b of one element 10A and the winding portion 3b of the other element 10B. It is desirable to apply.
[0027]
In addition, after overlapping the said inclination part 3c, it is possible to carry out spot welding etc. of the peripheral parts, for example.
[0028]
FIG. 6 shows another embodiment.
[0029]
The inclined portions 3c do not overlap each other, and a gap 51 is provided between them, and only the joint portion 53 between the lower end of the tightening portion 3b of one element 10A and the upper end of the tightening portion 3b of the other element 10B is joined. To do.
[0030]
As shown in FIGS. 1 and 2, the element 10 is stored in a box-shaped outer box 15 in a stacked manner, whereby a plurality of flow paths A, 2 for allowing two kinds of fluids to flow therein. B is formed. And it is comprised so that heat exchange is possible between the fluid which flows through each flow path A and B. FIG.
[0031]
When this plate heat exchanger 1 is used in an absorption refrigerator, one is a concentrated liquid and the other is a rare liquid. The pressure difference between the two is small.
[0032]
In the present embodiment, since the peripheral portions 3a of the two adjacent plates 3 are joined together by a winding process to form one element 10, there is no need for welding as in the prior art, and its workability is improved. As well as liquid leakage is suppressed.
[0033]
Each plate 3 has a communication hole 17 (FIG. 2). As shown in FIGS. 7a and 7b, the communication holes 17 of adjacent plates 3 are made of a stainless steel rope, a spring rope, or a baked steel ring. It joins by the joining member 21 which consists of materials with tension, such as a laying rope. The joining member 21 has a substantially U-shaped cross section, and two plates 3 are sandwiched in a groove 21a that opens to the outside, and the adjacent plates 3 are joined to each other. . The joining member 21 has a ring shape and has a notch 22 at one place in the circumferential direction.
[0034]
When this is used, an external force F is applied from the outer peripheral side so that the joining member 21 is deformed in an elliptical shape, and the portion of the notch 22 is deformed so as to overlap and is inserted into the through hole 17.
[0035]
Then, after sandwiching the two plates 3 in the groove 21a, when the external force F is removed, the joining member 21 returns to the original perfect circle shape by the spring force, thereby joining the adjacent plates 3 together. The
[0036]
In this embodiment, since the adjacent plates 3 are joined together by the joining member 21, it is not necessary to weld that portion, the workability can be significantly improved, and liquid leakage or the like is suppressed.
[0037]
Next, with reference to FIGS. 1, 2, and 8, a joint structure between the plate 3 and the caps 11 to 14 will be described.
[0038]
The caps 11 to 14 constitute a fluid inlet / outlet, and the fluid that has entered from the cap 12 flows through the channel A and flows out of the cap 11, and the fluid that has entered from the cap 14 flows through the channel B and flows out of the cap 13. .
[0039]
As described above, the plate-shaped SPCC plate 3 is thin (for example, thickness t = 0.5 mm). On the other hand, the caps 11 to 14 are thick pipes, and the wall thickness is, for example, 3 to 5 mm. When these are joined by TIG welding or plasma welding, the caps 11 to 14 are too thick, so the SPCC plate 3 is easily melted and joining becomes difficult.
[0040]
In the present embodiment, as shown in FIG. 8, the peripheral wall of the through hole 17 of the plate 3 is raised in a trumpet shape by burring, and an annular portion 17 a is formed therein, and the peripheral wall of the bases 11 to 14 is An annular groove 25 having a depth substantially half the thickness of the base 11 to 14 is formed, and the tip of the annular portion 17a is positioned on the bank portion 25a of the annular groove 25. The bases 11 to 14 are fitted around the circumference. And between the bank part 25a of the annular groove 25 and the front-end | tip of the annular part 17a is welded by TIG welding or plasma welding 26. FIG.
[0041]
Then, as shown in FIG. 2, the caps 11 to 14 and the lid body 15 </ b> A of the outer box 15 are joined by welding 28.
[0042]
According to this, since the thickness of the bank portion 25a of the annular groove 25 and the thickness of the annular portion 17a are substantially equal, welding is facilitated and poor welding is suppressed.
[0043]
FIG. 9 shows another embodiment.
[0044]
In this embodiment, the peripheral wall of the through-hole 17 of the plate 3 is raised in a trumpet shape by burring to form an annular portion 17a therein, and the wall thickness of the base 11 to 14 is formed on the outer peripheral wall of the base 11 to 14. An annular groove 25 having a substantially half depth is formed. The inner diameter of the tip of the annular portion 17a is formed to be substantially equal to the outer diameter of the caps 11 to 14, and the caps 11 to 14 are press-fitted into the annular portion 17a.
[0045]
In this case, a rubber sealing material 29 having elasticity, for example, is fitted in the annular groove 25 so as to protrude outward from the annular groove 25, and the bases 11 to 14 are connected to the annular groove 25. When press-fitted into the portion 17a, the gap between the caps 11 to 14 and the annular portion 17a is sealed through the sealing material 29. According to this, welding becomes unnecessary and poor welding is suppressed.
[0046]
As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this. For example, in the above-described embodiment, the plate 3 is accommodated in the outer box 15. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to a case where the outer box 15 is not used.
[0047]
【The invention's effect】
In the present invention, the peripheral wall of the through hole of the plate is raised in a trumpet shape, and an annular portion is formed therein, and an annular groove is formed in the outer peripheral wall of the base, and the tip of the annular portion is located at the bank portion of the annular groove. As described above, since the base is fitted to the inner periphery of the annular portion, and the gap between the bank portion of the annular groove and the tip of the annular portion is welded, the welding of the portion is facilitated, and poor welding is suppressed. The
[0048]
Moreover, the through-hole peripheral wall of the plate is raised like a trumpet, and an annular portion is formed there, and an annular groove is formed in the outer peripheral wall of the base, and a sealing material having elasticity is fitted in the annular groove. In addition, by press-fitting the base into the annular part, the structure between the base and the annular part is sealed via this sealing material, so that welding of that part becomes unnecessary and welding failure is suppressed. An effect is obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a plate heat exchanger according to the present invention.
FIG. 2 is a sectional view of the same.
3A is a cross-sectional view showing a state before winding and b is a state after winding. FIG.
4A is a cross-sectional view showing a state before winding and b is a state after winding. FIG.
FIG. 5 is a cross-sectional view showing a tightening portion.
FIG. 6 is a diagram showing another embodiment.
7A is a cross-sectional view of a joining member, and FIG. 7B is a plan view of the joining member.
FIG. 8 is a cross-sectional view showing a joined state of an annular portion and a base.
FIG. 9 is a cross-sectional view showing a joined state of an annular portion and a base.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plate type heat exchanger 3 Plate 3a Peripheral part 3b Winding part 3c Inclination part 9 Sealing material 10 Element 11-14 Base 15 Outer box 17 Communication hole 17a Annular part 21 Joining member 25 Annular groove 25a Bank part

Claims (3)

The peripheral parts of two adjacent plate-shaped plates are wound together , and an inclined part having a predetermined angle is provided on the peripheral part subjected to the fastening process to form one element,
In addition to overlapping the inclined portions of these elements, a predetermined interval is provided in advance between the peripheral edge portion of one element that has been tightened and the peripheral edge portion of the other element that has been tightened. By applying and joining the peripheral portions of each element, a plurality of flow paths that allow at least two kinds of fluids to flow therein are formed,
It is configured so that heat can be exchanged between the fluid flowing through each flow path,
The through-hole peripheral wall of the plate is raised like a trumpet, and an annular portion is formed therein, and an annular groove is formed in the outer peripheral wall of the base,
A base was fitted to the inner periphery of the annular portion so that the tip of the annular portion was positioned at the bank portion of the annular groove, and the gap between the bank portion of the annular groove and the tip of the annular portion was welded. A plate-type heat exchanger. The plate type according to claim 1 , wherein a sealing material is interposed between the peripheral portions, and the peripheral portions where the sealing material is interposed are wound to form one element. Heat exchanger. 3. The plate heat exchanger according to claim 1 , wherein each of the plates has a communication hole, and the communication holes of adjacent plates are joined together by a ring-shaped joining member .

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