JP4076636B2 - Plate heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate heat exchanger that can fix a gasket to a heat transfer plate without using an adhesive.
[0002]
[Prior art]
In the plate heat exchanger, as shown in FIG. 5, a plurality of heat transfer plates 2 having passage holes 2 e at four corners and a corrugated heat transfer surface 2 d in the middle are interposed via gaskets 1. A plurality of heat exchange channels are formed between the heat transfer plates 2 by alternately turning the layers upside down.
[0003]
Adhesion is generally used as a method for fixing the gasket 1 to the heat transfer plate 2, but an unnecessary adhesive fixing method has been developed for the purpose of shortening maintenance and maintenance work and removing an adhesive odor. In this method, the gasket 1 is fixed to the heat transfer plate 2 by fitting a fitting portion protruding from the outer periphery of the gasket 1 into a slit provided in the heat transfer plate 2, and an example thereof is shown in FIGS. As shown in FIG. 6A and 6B show the gasket 1, FIGS. 7A and 7B show the heat transfer plate 2, and FIGS. 8A and 8B show the gasket 1 attached to the heat transfer plate 2. FIG. Respectively.
[0004]
As shown in FIG. 6, the gasket 1 is integrally formed with a stopper portion 1b that protrudes in a U-shape on the outside thereof. The stopper portion 1b includes a pair of projecting portions 10 that project from the gasket body 1a, and a fitting portion 11 that is disposed in parallel with the gasket body 1a. As shown in FIGS. 7 (a) and 7 (b), a corrugated portion 2a having a corrugated cross section is formed in a region slightly inside the peripheral edge of the heat transfer plate 2, and a peak of the corrugated portion 2a is formed. A slit 22 is formed across the part 20 and a partial region of the valley 21 on both sides thereof. As shown in FIGS. 8A and 8B, the gasket 1 is attached to the heat transfer plate 2 by fitting the gasket body 1a into the gasket groove 2c of the heat transfer plate 2, and further slitting the fitting portion 11 of the gasket 1. This is done by fitting the protrusions 10 into the valleys 21 at 22. The gasket 1 is positioned in a direction perpendicular to the gasket groove direction (left and right direction in FIGS. 8A and 8B) by the engagement of the fitting portion 11 and the slit 22, and is enlarged to FIG. As shown in the figure, the protrusion 10 is engaged with the wall surface 21a in the gasket groove direction at the bottom of the valley portion 21, thereby positioning in the gasket groove direction.
[0005]
[Problems to be solved by the invention]
8 and 12A, the above-described heat transfer plate has the bottom surface of the gasket groove 2c positioned at the lower stage of the plate 2 (the bottom level Bg of the gasket groove 2c is that of the valley portion 21). In addition, as shown in FIGS. 10, 11 and 12B, the bottom surface of the gasket groove 2c is placed on the bottom surface of the heat transfer plate 2 as shown in FIGS. In some cases, the bottom level Bg of the gasket groove 2c is made shallower than the bottom level Br of the trough 21 (hereinafter referred to as a groove bottom middle type).
[0006]
When the same gasket 1 as in FIGS. 6 to 8 is used in the above groove bottom middle type, the protruding portion 10 of the stopper portion 1b is different from the wall surface 21a of the trough portion 21 as shown in FIG. It will be in a floating state without contact. For this reason, positioning in a direction parallel to the gasket groove direction becomes difficult, and the gasket 1 may be displaced from the normal seal line, leading to problems such as liquid leakage.
[0007]
Accordingly, an object of the present invention is to provide a plate heat exchanger that can position a gasket reliably even when a groove bottom middle type heat transfer plate is used.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a gasket having a fitting portion on the outside of a gasket body, a corrugated portion having a corrugated cross section in the gasket groove direction on the outside of the gasket groove, and the gasket groove in the corrugated portion. A plate-type heat exchanger for fixing the gasket to the heat transfer plate by fitting the fitting portion into the slit and having a slit in the direction. In the case where the thickness of the fitting portion is smaller than the depth of the slit , the protruding portion is interposed between the fitting portion and the gasket body, and the protruding portion is inserted into the gasket groove. Project from the surface of the gasket body in contact with the bottom surface of the gasket and contact the bottom surface of the trough portion of the corrugated portion, and engage the projecting portion with the trough portion of the corrugated portion from both sides in the gasket groove direction to transfer heat to the gasket. Plate and Between, and so as to restrict the relative movement of both the gasket groove direction.
[0010]
Further, the heat transfer is provided with a gasket having a fitting portion on the outside of the gasket body, and a wavy portion having a corrugated cross section in the gasket groove direction on the outside of the gasket groove, and a slit provided in the wavy portion in the gasket groove direction. A plate type heat exchanger in which the fitting portion is fitted into a slit and the gasket is fixed to the heat transfer plate, and the bottom of the gasket groove is located between the crest and trough of the corrugated portion. In the arrangement, an uneven fitting portion that can be engaged with each other in the gasket groove direction is provided between the fitting portion and the slit, and both of the gasket in the gasket groove direction are provided between the gasket and the heat transfer plate. Relative movement may be restricted.
[0011]
In this case, it is conceivable that the uneven fitting portion has a U shape protruding in a direction orthogonal to the gasket groove direction or a V shape protruding in a direction orthogonal to the gasket groove direction.
[0012]
A gasket having a fitting portion on the outside of the gasket body, a heat transfer plate having a corrugated portion having a corrugated cross section in the gasket groove direction on the outside of the gasket groove, and a slit provided in the gasket groove direction on the corrugated portion; A plate-type heat exchanger that fits the fitting portion into a slit and fixes the gasket to the heat transfer plate, and the bottom of the gasket groove is disposed between the crest and trough of the wavy portion In this case, a second projecting portion is provided outside the gasket body so as to be separated from the fitting portion, and the second projecting portion is engaged with the other trough portion of the wavy portion from both sides in the gasket groove direction. The relative movement between the gasket and the heat transfer plate in the gasket groove direction may be restricted.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a plate heat exchanger according to the present invention will be described with reference to FIGS.
[0014]
As shown in FIGS. 1 (a) to 1 (c), the gasket 1 includes a substantially rectangular loop-shaped gasket main body 1a that divides the periphery of the heat transfer plate 2 in a liquid-tight manner on the entire periphery thereof, and the gasket main body 1a. The stopper portion 1b is formed integrally with a U-shaped protrusion. The stopper portion 1b is integrally formed by a pair of projecting portions 10 projecting in a direction orthogonal to the gasket body 1a and a fitting portion 11 disposed in parallel to the gasket body 1a. The upper surfaces 10a and 11a (surfaces that are not in contact with the heat transfer plate to be mounted) are at the same level. The stopper portions 1b are provided at appropriate intervals at a plurality of locations around the gasket body 1a.
[0015]
On the outside of the heat transfer surface 2d (see FIG. 5) of the heat transfer plate 2, a gasket groove 2c for accommodating the gasket body 1a is formed in a substantially rectangular frame shape. On the outside of the gasket groove 2c, a corrugated portion 2a having a corrugated cross section in the gasket groove direction (referring to the extending direction of the gasket groove 2c: the left-right direction in FIGS. 1A and 1B) is formed. The wavy portion 2a is formed over the entire circumference of the heat transfer plate 2, and a slit 22 for fitting the fitting portion 11 is formed across the mountain portion 20 and a partial region of the valley portion 21 on both sides thereof. Has been. The slits 22 are formed at a plurality of locations on the peripheral edge of the heat transfer plate 2 in accordance with the arrangement pitch of the fitting portions 11. The crest 20 and the trough 21 of the wavy portion 2a extend in the direction perpendicular to the gasket body 1a, and the end thereof reaches the edge of the plate 2.
[0016]
The bottom of the gasket groove 2c is in the middle of the heat transfer plate 2, that is, at an almost middle position between the peak 20 and the valley 21 of the waved portion 2a. From this, the bottom level Bg of the gasket groove 2c is the bottom level of the valley 21 It is shallower than Br. The bottom of the gasket groove 2c does not have to be at an exact middle position, it is sufficient if it is between the peak 20 and the valley 21 of the corrugated part 2a, and it is slightly shifted from the middle position to the front and back sides of the plate. It doesn't matter.
[0017]
From the above configuration, the gasket 1 is fitted into the gasket groove 2c, and the protruding portion 10 is fitted into the valley portion 21 of the corrugated portion 2a, and the fitting portion 11 is fitted into the slit 22, so that the gasket 1 is heated to the heat transfer plate 2. Fixed to.
[0018]
In the plate heat exchanger according to the present invention, the relative movement in the gasket groove direction between the gasket 1 and the heat transfer plate 2 is restricted. FIG. 1 shows a specific example of the gasket 1 by projecting the protruding portion 10 toward the valley 21 and forming a thicker wall than the conventional product, and forming a cross-sectional shape along the bottom of the valley 21. At the time of mounting, the projecting portion 10 is in contact with the bottom surface and both side surfaces 21a of the valley portion 21, and engages with the valley portion 21 on both sides in the gasket groove direction. With this structure, the positioning in the direction perpendicular to the gasket groove direction is performed by the engagement of the fitting portion 11 and the slit 22, and the positioning in the gasket groove direction is performed by the engagement of the protruding portion 10 and the valley portion 21. Therefore, it is possible to prevent the gasket 1 from being displaced in any direction, and to avoid problems such as liquid leakage due to the displacement.
[0019]
Note that the bulging portion 10b (see FIG. 1C) of the protruding portion 10 does not need to be provided over the entire length, and may be provided at least at a part thereof.
[0020]
FIG. 2 and FIG. 3 show the second and third embodiments of the present invention, and have a structure in which the relative movement is restricted by the concave / convex fitting portion 3 provided between the fitting portion 11 and the slit 22. . This uneven | corrugated fitting part 3 is comprised so that it can mutually engage in a gasket groove direction. FIG. 2 exemplifies the concave / convex fitting portion 3 formed in a U-shape projecting in a direction orthogonal to the gasket groove 2c. As the convex portion of the concave / convex fitting portion 3, the side edge of the fitting portion 11 is illustrated. A U-shaped small protrusion 30 is provided in the portion, and a U-shaped notch 31 that engages with the small protrusion 30 is formed on the side wall of the slit 22 as a concave portion of the concave-convex fitting portion 3. On the other hand, FIG. 3 exemplifies the concave / convex fitting portion 3 formed in a V shape projecting in a direction orthogonal to the gasket groove 2c. As the convex portion of the concave / convex fitting portion 3, the side edge portion of the fitting portion 11 is illustrated. In addition, a V-shaped protrusion 32 is formed over the entire length, and a V-shaped recess 33 that engages with the V-shaped protrusion 32 is provided on the side wall of the slit 22. In any configuration, since the fitting portion 11 and the slit 22 are positioned in the gasket groove direction, the displacement of the gasket 1 can be reliably prevented as in FIG.
[0021]
FIG. 4 shows a fourth embodiment of the present invention, which is an example in which the relative movement restricting means is provided at a position separated from the stopper portion 1b. Specifically, a second projecting portion 34 is provided outside the gasket body 1a so as to be separated from the stopper portion 1b (particularly the fitting portion 11), and this second projecting portion 34 is provided as the projecting portion 10 in FIG. By forming the bulging portion 34b with a thick wall in the same manner as above, it engages with the other trough portion 35 (the trough portion other than the trough portion that fits the protruding portion 10) on both sides in the gasket groove direction. It is possible to achieve the same positioning effect as the structure shown in FIGS.
[0022]
In the above description, the case where the stopper portion 1b is formed in a U-shape (O-type) is illustrated, but the present invention may be applied to the case where the stopper portion 1b is formed in another shape, for example, an L shape or an I shape. The same can be applied.
[0023]
【The invention's effect】
As described above, according to the present invention, not only the positioning of the gasket in the direction perpendicular to the gasket groove direction but also the positioning in the gasket groove direction is ensured, so that the displacement of the gasket is reliably prevented. In addition, it is possible to avoid problems such as liquid leakage due to positional deviation.
[Brief description of the drawings]
FIG. 1 is a plan view (a), a front view (b), and a cross-sectional view (c) in a direction orthogonal to a gasket groove direction, showing an embodiment of the present invention.
2A is a plan view showing another embodiment of the present invention, FIG. 2B is a front view, and FIG. 2C is a sectional view in a direction perpendicular to the gasket groove direction.
FIG. 3A is a plan view showing another embodiment of the present invention, FIG. 3B is a front view, and FIG. 3C is a cross-sectional view in a direction orthogonal to the gasket groove direction.
4A is a plan view showing another embodiment of the present invention, FIG. 4B is a front view, and FIG. 4C is a cross-sectional view in a direction perpendicular to the gasket groove direction.
FIG. 5 is a plan view of a heat transfer plate.
FIG. 6 is a plan view (a) and a front view (b) of the gasket.
7A is a plan view of a heat transfer plate, and FIG. 7B is a cross-sectional view taken along line XX.
FIG. 8A is a plan view of a heat transfer plate equipped with a gasket, and FIG. 8B is a cross-sectional view taken along line XX.
FIG. 9 is an enlarged cross-sectional view showing a fitting state of the male / female fitting portion.
10A is a plan view of a heat transfer plate, FIG. 10B is a sectional view taken along line XX, and FIG. 10C is a sectional view taken along line YY.
FIG. 11A is a plan view of a heat transfer plate equipped with a gasket, FIG. 11B is a cross-sectional view taken along line XX, and FIG. 11C is a cross-sectional view taken along line YY.
FIG. 12 is a cross-sectional view (a) of a plate heat exchanger having the bottom of the gasket groove in the lower plate stage, and a cross-sectional view (b) of the plate heat exchanger having the middle plate position.
[Explanation of symbols]
1 Gasket
1a Gasket body
1b Stopper
10 Protrusion
11 Fitting part 2 Heat transfer plate
2a Wavy section
2c Gasket groove
20 Yamabe
21 Tanibe
22 Slit 3 Concavity and convexity fitting part
34 Second protrusion
35 Other valleys

Claims (5)

A gasket having a fitting portion on the outside of the gasket body, a heat transfer plate having a corrugated portion having a corrugated cross section in the gasket groove direction on the outside of the gasket groove, and a slit provided in the gasket groove direction on the corrugated portion; A plate-type heat exchanger in which the fitting portion is fitted into a slit and the gasket is fixed to the heat transfer plate, and the bottom of the gasket groove is disposed between the crest and trough of the wavy portion. In the case where the thickness of the fitting part is smaller than the depth of the slit ,
A protrusion is interposed between the fitting portion and the gasket body, the protrusion protrudes beyond the surface of the gasket body that contacts the bottom surface of the gasket groove, and contacts the bottom surface of the valley portion of the corrugated portion. The plate type is characterized in that the corrugated trough is engaged from both sides in the gasket groove direction and the relative movement of both in the gasket groove direction is restricted between the gasket and the heat transfer plate. Heat exchanger. A gasket having a fitting portion on the outside of the gasket body, a heat transfer plate having a corrugated portion having a corrugated cross section in the gasket groove direction on the outside of the gasket groove, and a slit provided in the gasket groove direction on the corrugated portion; A plate-type heat exchanger that fits the fitting portion into a slit and fixes the gasket to the heat transfer plate, and the bottom of the gasket groove is disposed between the crest and trough of the wavy portion In things,
A concave / convex fitting part that can be engaged with each other in the gasket groove direction is provided between the fitting part and the slit, and the relative movement of both in the gasket groove direction is restricted between the gasket and the heat transfer plate. A plate-type heat exchanger characterized by the above . The plate heat exchanger according to claim 2 , wherein the concave-convex fitting portion has a U shape protruding in a direction orthogonal to the gasket groove direction. The plate heat exchanger according to claim 2 , wherein the concave-convex fitting portion has a V-shape projecting in a direction orthogonal to the gasket groove direction. A gasket having a fitting portion on the outside of the gasket body, a heat transfer plate having a corrugated portion having a corrugated cross section in the gasket groove direction on the outside of the gasket groove, and a slit provided in the gasket groove direction on the corrugated portion; A plate-type heat exchanger that fits the fitting portion into a slit and fixes the gasket to the heat transfer plate, and the bottom of the gasket groove is disposed between the crest and trough of the wavy portion In things,
On the outside of the gasket body, the second protrusions arranged spaced apart from the fitting portion, and the second protrusion is engaged from both sides of the other of the valley and the gasket groove direction of the corrugations, a gasket A plate heat exchanger characterized in that the relative movement of both in the gasket groove direction is restricted between the heat transfer plate and the heat transfer plate .

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