JPH07260389A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To improve a pressure resistance by forming the depth of an outer peripheral part in a gasket groove constituting a passage on which a gasket is mounted deeper than the depth of a heat transfer surface in a heat exchanger in which a plurality of plates are laminated and a plurality passages are formed. CONSTITUTION:A plate type heat exchanger comprises a plurality of plates 1 and 2 which are alternately laminated and a plurality of passages A and B for a heat exchanging medium which are alternately formed. On each of the plates 1 and 2, passage holes 3 to 6 of the heat ecchanging medium are formed at four corner parts and a gasket groove 10 is formed on the periphery of a heat transfer surface 7 including them. Each gasket 11 or 12 is mounted on the gasket groove 10. In this case, at least the depth d of an outer peripheral part 20 in the gasket groove 10 is formed slightly deeper than the depth a of the heat transfer surface 7. Thus, when the plates 1 and 2 are laminated, they come into more tight contact with each other on the outer peripheral part 20 than on the heat transfer surface 7 to improve the holding force and heat resistance of the respective gaskets 11 and 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger in which a large number of plates are laminated with gaskets interposed therebetween, and a gasket for sealing between the laminated plates has improved pressure resistance. It is a thing.

[0002]

2. Description of the Related Art A plate heat exchanger is shown in FIG.
A plurality of plates (1) and (2) as shown in (b) are alternately laminated to form two channels (A) and (B) for heat exchange media alternately. The plates (1) and (2) have the same structure, and as shown in (a) and (b) of FIG. 7, passage holes (3) that allow passage of the heat exchange medium are provided at the four corners of the rectangular metal plate. ) (4) (5) (6), and the gasket groove (10) is formed around the heat transfer surface (7) including the passage hole. Then insert the gasket (1) into the gasket groove (10).
1) By mounting (12), the plate (1)
It constitutes (2). In one plate (1), the passage holes (3) and (5) on one side of the gasket (11) communicate with the heat transfer surface (7), and the passage (A) for one heat exchange medium.
And the upper and lower passage holes (4) and (6) on the other side are configured so as not to communicate with the heat transfer surface (7) by the gasket (11) and the series of double seal portions (13). . In the other plate (2), the passage holes (4) and (6) on the other side of the plate (2) communicate with the heat transfer surface (7) in the gasket (12) to form the flow path (B) for the other heat exchange medium. The upper and lower passage holes (3) and (5) are configured so as not to communicate with the heat transfer surface (7) by the gasket (12) and the series of double seal portions (14).

Although not shown, the heat transfer surface (7) of the plates (1) and (2) is provided with various irregularities in order to enhance heat transfer efficiency. Also the conventional plate (1)
The molding depth of the heat transfer surface (7) and the gasket groove (10) in (2) was molded to the same dimension as the molding depth required for heat transfer. Therefore, the plate (1)
When (2) is laminated with a tightening dimension per plate as a standard dimension in which the plate thickness is added to the molding depth of the heat transfer surface (7), as shown in FIG. 8, a gasket groove (10) is formed. The front and rear plates (1) and (2) come into close contact with each other on both sides of the gasket, and the gaskets (11) and (12)
Is held in the gasket groove (10) (10), and high sealing performance is secured.

[0004]

The plates (1) and (2) used in the plate-type heat exchanger are manufactured by press molding. However, since the molding depths formed by press molding vary, depending on the case. As shown in FIG. 9, the molding depth (b) of the outer peripheral portion (15) of the gasket groove (10) becomes shallower than the molding depth (a) of the heat transfer surface (7), or as shown in FIG. In the same way, double seal part (13) (1
4) Or the forming depth (e) of both side parts (16) (16) of the gasket groove (10) such as a triangular weir may be shallower than the forming depth (a) of the heat transfer surface (7).

When such plates (1) and (2) are laminated, if the tightening size per plate is set to the standard size, as shown in FIG. 10, the gasket groove (1
0), there is a gap (17) between the outer peripheral portions (15) or, as shown in FIG. 12, a double seal portion (13).
(14) Or a gap (17) is formed between both side portions (16) and (16) of the gasket groove (10) such as a triangular weir. Therefore, when the internal pressure becomes high, the force for pushing the gasket (11) or (12), which functions as a seal, to the outside increases, and the gasket (11) is generated at the portion where the gap (17) is generated.
Alternatively, (12) is likely to be displaced, and the pressure resistance performance is deteriorated.

Further, the tightening dimension per plate is made smaller than the dimension obtained by adding the plate thickness to the forming depth of the heat transfer surface (7), and the plate (1) is provided on the outside or both sides of the gasket groove (10). ) If the close contact is made between (2), not only a great amount of labor is required for tightening, but also the cross-sectional area of the liquid passage between the plates (1) and (2) on the heat transfer surface (7). Will be smaller than that required for performance, which will hinder driving.

The present invention is intended to provide a plate heat exchanger having sufficient pressure resistance even if the tightening size per plate is in a standard state.

[0008]

The present invention has four passage holes which allow passage of a heat exchange medium at four corners, and a gasket groove formed around the heat transfer surface including these passage holes. A gasket is attached, and two upper and lower passage holes are set as one set, one set is in communication with the heat transfer surface, and the other set is a plurality of plates that are not in communication with the heat transfer surface due to the double seal part. In a plate type heat exchanger in which flow paths for two types of heat exchange media are alternately formed by stacking, the plate type in which the molding depth of the outer peripheral portion or both sides of the gasket groove is deeper than the molding depth of the heat transfer surface It is a heat exchanger.

[0009]

In the plate type heat exchanger, when the plates are laminated, the outer side or both sides of the gasket groove are in intimate contact with each other than the heat transfer surface.
The pressure resistance is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. However, the same components as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, the molding depth (d) of the outer peripheral portion (20) outside the gasket groove (10) formed in the plate (1) is determined by the molding depth (d) of the heat transfer surface (7). Mold a little deeper than a). Further, in the double seal portion (13), the forming depth (f) of both side portions (21) (21) of the gasket groove (10) is formed slightly deeper than the forming depth (a) of the heat transfer surface (7). .

The forming depth (d) of the outer peripheral portion (20) of the gasket groove (10) and the forming depth (f) of both side portions (21) (21) of the gasket groove (10) are both heat transfer surfaces. It is set deeper than the molding depth (a) in (7) in consideration of the molding error.

The other plate (2) is similarly shaped.

When such plates (1) and (2) are laminated and tightened with a standard size in which the tightening size per plate is the sum of the molding depth of the heat transfer surface and the plate thickness of the plate, FIG. 3 and FIG. As shown in FIG. 4, the plates (1) and (2) before and after the gasket groove (10) are in close contact with each other on both sides of the outer peripheral portion (20) or the double seal portion (13).

Both side portions (2) of the gasket groove (10)
Regarding 1) and (21), the double seal portion has been described, but the implementation location is not limited.

When a large amount of force is required to bring the outer side or both sides of the gasket groove (10) into close contact with each other, as shown in the hatched portion of FIG. 5 and FIG. The molding depth may be increased only in the vicinity. In addition, the entire gasket groove (10) may be partially performed only in a portion having particularly low pressure resistance.

[0017]

According to the present invention, even if the plates are tightened with standard tightening dimensions, the outside of the gasket groove and both sides of the gasket groove in the double seal portion are surely in contact with each other. Even if the internal pressure becomes high, the gasket does not shift to the outside, and the pressure resistance becomes extremely high.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a plate according to the present invention.

FIG. 2 is a partial sectional view showing an embodiment of a plate according to the present invention.

FIG. 3 is a partial sectional view showing an embodiment of a heat exchanger according to the present invention.

FIG. 4 is a partial sectional view showing an embodiment of a heat exchanger according to the present invention.

FIG. 5 is a schematic front view showing another embodiment of the plate according to the present invention.

FIG. 6 is a partial sectional view showing another embodiment of the plate according to the present invention.

FIG. 7 is a schematic front view of plates constituting a plate heat exchanger.

FIG. 8 is a partial cross-sectional view of a plate heat exchanger.

FIG. 9 is a partial sectional view of a plate showing a conventional problem.

FIG. 10 is a partial sectional view of a plate heat exchanger showing a conventional problem.

FIG. 11 is a partial sectional view of a plate showing a conventional problem.

FIG. 12 is a partial sectional view of a plate heat exchanger showing a conventional problem.

[Explanation of symbols]

 1.2 Plate 3/4/5/6 Passage hole 7 Heat transfer surface 10 Gasket groove 20 Gasket groove outer circumference 21 Both sides of gasket groove a Heat transfer surface forming depth d Gasket groove outer forming f Molding depth on both sides of gasket groove

Claims (1)

[Claims] Claims: 1. Four passage holes are provided at four corners to allow passage of a heat exchange medium, and gaskets are attached to gasket grooves formed around the heat transfer surface including these passage holes, thereby to Two sets of passage holes, one set is connected to the heat transfer surface, and the other set is a stack of plates that are not connected to the heat transfer surface with double seals. In a plate heat exchanger in which medium flow paths are alternately formed, a plate heat exchanger characterized in that a molding depth of an outer peripheral portion or both side portions of the gasket groove is made deeper than a molding depth of a heat transfer surface. .