JP3061101U - Gasket for plate heat exchanger - Google Patents

Abstract

(57) [Problem] To provide a novel gasket for a laminated plate type heat exchanger that completely or sufficiently eliminates the cause of contamination. SOLUTION: A gasket for a flow passage for sealing a fluid flow passage, which is used for a heat exchanger of a type in which a plurality of heat transfer plates having fluid passage holes at four corners of a heat transfer surface forming a fluid flow passage are stacked. A gasket portion for a passage hole for sealing the passage portion and the fluid passage hole, and a gasket portion for the flow passage and a gasket portion for the passage hole formed between the gasket portion and the open space seal portion with a leaked fluid discharge port for sealing the open space to the atmosphere. A gasket to be used in a state in which up to half of the thickness is dropped into the gasket groove and fitted between the heat transfer plates, and a gasket connecting portion for connecting the gasket portion for the passage and the gasket portion for the passage hole is provided. The gasket connecting portion is dropped into a fitting groove having substantially the same depth as the gasket groove, and the top surface of the gasket connecting portion is lower than or equal to the opening surface of the fitting groove. The cross-sectional shape of the drop-in fitting portion and the fitting groove of the fitting portion has a dovetail shape.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a gasket for a laminated plate type heat exchanger in which a gasket portion for a flow passage and a gasket portion for a passage hole are connected by a gasket connecting portion.

[0002]

[Prior art]

 Conventionally, a gasket for a laminated plate type heat exchanger shown in FIGS. 4 to 6 has been known. This gasket has a heat transfer surface in which fluid flow holes 1 are formed at four corners of a heat transfer surface 2. An air opening space sealing portion 9 formed between a gasket main body portion 5 and a passage hole gasket portion 6 fitted to the plate 4 and sealing the fluid passage 1 and the fluid passage hole 3, respectively; A bridge in which the gasket main body 5 and the passage hole gasket 6 are substantially the same thickness as the gasket main body 5 and the passage hole gasket 6 and are disposed in the vicinity of the open space seal 9. Since the bridge 10 is substantially the same thickness as the gasket main body 5 and the passage hole gasket 6, the bridge 10 is ridge-shaped in the open-to-atmosphere space 7. Leakage flow from the seal They had the worst of the pollution factors that worsen the outflow.

[0003] Therefore, the present inventors have tried to eliminate the above-mentioned pollution factor by eliminating the ridge-like overhanging portion by making the bridge portion approximately half the thickness. However, this has the disadvantage that the bridge (corresponding to the connecting portion of the present invention) has a half thickness, so that it is easy to twist, and the twist prevents flow and causes contamination. It turned out to be.

Therefore, the present inventor has been able to devise the present invention by trial and error in order to solve the above inconvenience.

[0005]

[Problems to be solved by the invention]

 SUMMARY OF THE INVENTION An object of the present invention is to provide a novel gasket for a laminated plate type heat exchanger that completely or sufficiently eliminates the above-mentioned pollution factors.

[0006]

[Means for solving the problem]

 In order to achieve the above object, the gasket for a plate-stacked heat exchanger according to the present invention has a structure in which a plurality of heat transfer plates having fluid passage holes at four corners of a heat transfer surface forming a fluid passage are laminated. The gasket for the flow path that seals the fluid flow path, the gasket for the passage hole that seals the fluid passage hole, and the gasket for the flow path and the gasket for the passage hole. It has an open space seal with a leaked fluid outlet that seals the open air space formed between the heat transfer plates, and is used with up to half its thickness dropped into the gasket groove and fitted between the heat transfer plates. Regarding the gasket, a gasket connecting portion for connecting the gasket portion for the flow passage and the gasket portion for the passage hole is provided, and the gasket connecting portion is inserted into a fitting groove having substantially the same depth as the gasket groove. When And if lower than the opening surface of in groove fit the top surface of the gasket coupling part Ku are those comprising the in groove cross-sectional shape fitting the fitting portion and the department narrowing down with the same as dovetail shape.

[0007]

【Example】

 The embodiment of the present invention shown in FIGS. 1 to 3 has a rectangular shape having a heat transfer surface 12 forming a fluid flow path 11 at the time of lamination and fluid passage holes 13 provided at four corners of the heat transfer surface 12. A plurality of heat transfer plates 14 are laminated via a gasket 18 having a gasket portion 16 for a flow passage and a gasket portion 17 for a passage hole, which are mounted to the gasket grooves 15 of each of the heat transfer plates 14 to a half thickness. The flow paths 11 through which different kinds of fluids flow are alternately arranged. The fluid flow path 11 is sealed by a flow path gasket portion 16, and the fluid passage hole 13 is sealed by a passage hole gasket portion 17. Things.

In addition, the gasket 18 includes open space seal portions 23 and 24 for forming an air open space 22 open to the atmosphere between the gasket portion 16 for the flow path and the gasket portion 17 for the passage hole, and a leakage fluid leakage. The outlets 25 and 26 are provided, and up to half the thickness of the open space seal 23 is dropped and fitted into the gasket groove 15 of the heat transfer plate 14 similarly to the flow path gasket section 16 and the vent hole gasket section 17. Gasket connecting portions 27 and 28 for connecting the road gasket portion 16 and the passage hole gasket portion 17 are provided, and these gasket connecting portions 27 and 28 are fitted with fitting grooves 29 having substantially the same depth as the gasket groove 15. , 30 and the top surfaces of the gasket connecting portions 27, 28 are lower than the opening surfaces of the fitting grooves 29, 30 and the gasket connecting portions 2 The cross-sectional shape of the fitting grooves 29, 30 of the parts 7, 28 and the parts 27, 28 is a dovetail shape.

[0009]

[Effect of the invention]

 Since the gasket for the plate-stacked heat exchanger according to the present invention has the above-described configuration, the gasket connecting portions 27 and 28 do not form a ridge-shaped overhang like the bridge 10 of the conventional example. In addition, since the cross-sectional shapes of the gaskets 27, 28 and the fitting grooves 29, 30 of the same portion are dovetail-shaped, the connecting portions 27, 28 do not twist, so that the above-mentioned pollution factor is eliminated. The intended purpose can be fully achieved.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a perspective view showing a part of a gasket.

FIG. 4 is a front view of a main part showing a conventional example.

FIG. 5 is a sectional view taken along the line BB in FIG. 4;

FIG. 6 is a perspective view showing a part of the gasket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Flow path 12 Heat transfer surface 13 Fluid passage hole 14 Heat transfer plate 15 Gasket groove 16 Gasket part for flow path 17 Gasket part for passage hole 18 Gasket 22 Air open space 23, 24 Open space seal part 25, 26 Leakage fluid discharge port 27, 28 Gasket connecting part 29, 30 Fitting groove

Claims (1)

[Utility model registration claims] 1. A heat exchanger of a type in which a plurality of heat transfer plates having fluid passage holes at four corners of a heat transfer surface forming a fluid passage are stacked, and for a passage for sealing the fluid passage. A gasket portion for a passage hole for sealing the gasket portion and the fluid passage hole, and a gasket portion for the flow passage, an open space seal portion with a leaked fluid discharge port for sealing an open air space formed between the gasket portions for the passage hole; With regard to a gasket used in a state in which half of the thickness is dropped into the gasket groove and fitted and sandwiched between the heat transfer plates, a gasket connecting portion connecting the gasket portion for the passage and the gasket portion for the passage hole is provided. The gasket connecting portion is fitted into a fitting groove having substantially the same depth as the gasket groove, and the top surface of the gasket connecting portion is lower than or equal to the opening surface of the fitting groove. A gasket for a plate-stacked heat exchanger, wherein a cross-sectional shape of a drop-in fitting portion and a fitting groove of the fitting portion is formed in a dovetail shape.