RU2164332C2 - Stack of plates for heat exchanger - Google Patents

Abstract

FIELD: heat-exchange apparatus in public utilities and in chemical, petroleum and refrigerating branches of industry. SUBSTANCE: stack of plates for heat exchanger consists of alternating smooth and corrugated plate-inserts. They have projections and hollows on their surface alternating along both axes of plate-insert plane. Corrugations on surface of plate-inserts are formed as projections and hollows. EFFECT: simplified manufacture and assembly of plates. 3 dwg

Description

 The invention relates to sets of plate elements with means for increasing the heat transfer area, in particular with fins, troughs designed for assembly in the form of stacked sets, and can be widely used in heat exchangers in the utilities, chemical, oil and refrigeration industries.

 A well-known package of plates for a heat exchanger described in mz PCT N 91-16589 "Plate evaporator" according to class F 28 F 3/06, 3.02, s. 04/15/91, op. 10/31/91.

 The known package consists of several adjacent heat exchange plates equipped with corrugations in the form of protrusions and depressions, the corrugations on each plate forming several zones with different directions of the corrugations and on adjacent plates some of the zones have the opposite direction of the corrugations, and some of the zones have the same direction of the corrugations .

 A disadvantage of the known package is the need to use elements during assembly that ensure the plates are placed at a certain distance from each other to create channels for the flow of heat transfer fluid, and the selection of plates with alternating zones with different corrugations during assembly.

 A known package of plates for a heat exchanger, described in s. Great Britain N 2236841 "Heat exchanger" according to cl. F 28 F 13/00, c. 08/09/89, op. 04/17/91.

 The known package contains a stack of plates adjacent to each other, the surfaces of which are made with small hemispherical protrusions for turbulizing the flows of heat-exchange fluids and are channels for supplying these media, and semi-cylindrical protrusions extending across the entire width of the plate serve to create the necessary gap between the plates moreover, on adjacent plates, channels for supplying heat transfer media are arranged mutually perpendicularly.

 A disadvantage of the known package is the need to perform special elements to obtain the necessary gap between the plates and to ensure a certain mutual orientation of the plates when assembling them into a package.

 Closest to the technical nature of the claimed is a package of plates for a heat exchanger described in a. from. USSR N 1688099 "Heat exchanger" according to class. F 28 D 9/00, F 28 F 3/02, h. 10/09/89, op. 10.30.91 and selected as a prototype.

 The known package consists of alternating smooth plates and corrugated insert plates, the corrugations of which are made in the form of trapezoidal protrusions and depressions alternating along one axis of the insert plane of the insert, extending along the entire width of the insert plate, while turbulent notches are made on the protrusions and depressions, bent with the formation of conical surfaces towards the wide part of the trapezoid, and the corrugations on the insert plates adjacent to one smooth plate have a mutually perpendicular direction.

 A disadvantage of the known package is the need to make turbulent cuts on the surface of the corrugations, to ensure their different orientation on the flat surface of the corrugations and to provide a certain orientation of the insert plates themselves when assembling all the plates into the package to create mutually perpendicular channels for supplying heat transfer media. In addition, in the known heat exchanger, heat transfer is reduced due to the fact that in places where the depressions fit to the surface of the smooth plate, a double thickness of the metal plate is obtained. The execution of corrugations continuous and long forms narrow extended channels for heat-transfer medium flows, into which it is necessary to supply flows in a mutually perpendicular direction, which is not always convenient in operation, and due to the limited channels of the corrugation walls, the liquid experiences considerable resistance in them, which requires a greater thickness plates, and corrugations are required to perform a relatively large height, which increases the size of the heat exchanger. At the same time, to ensure optimal operation of the heat exchanger, the plates in it should be square, which also increases the size of the heat exchanger. In addition, due to the fact that the insert plates are corrugated along the entire length, it is difficult to seal the channels in the heat exchanger assembled from them.

 The aim of the invention is to simplify the manufacture of plates and assembling them into a bag while increasing heat transfer, reducing the thickness of the plates and reducing the size of the heat exchanger.

 This goal is achieved by the fact that in the package of plates for the heat exchanger, consisting of alternating smooth plates adjacent to each other and corrugated insert plates having corrugations on the surface of the corrugations in the form of protrusions and depressions alternating along one axis of the plane of the insert plate, according to a utility model corrugations on the insert plates are made in the form of protrusions and depressions alternating along both axes of the plane of the insert plate.

 At the same time, corrugations made in the form of protrusions and depressions can have different sizes.

 In addition, the edges of the insert plates are configured to provide sealing during assembly.

 The implementation of the corrugations on the insert plates in the form of protrusions and depressions alternating along both axes of the insert plate plane makes them small in length and makes it possible to dispense with special turbulators, simplifying the process of their manufacture and assembly and allowing them to simultaneously play the role of turbulators and the role of elements providing a given gap between the plates. The fact that the corrugations alternating along both axes are obtained sufficiently short in this case sharply reduces the possibility of stagnant zones in the fluid flow channel, eliminates the presence of zones with double plate thickness, which intensifies and improves heat transfer, and also prevents the plates from sticking together significant fluid pressure, allowing plates to be made thinner. Since the corrugations are not continuous and the entire space between the smooth plate and the insert plate serves as a channel for the flow of heat transfer liquid, this stream does not meet such a high resistance of the corrugations as in the case of channels limited by continuous corrugations in the prototype; this allows to reduce the gap between the plates and to reduce the size of the heat exchanger. Making the edges of the insert plates smooth makes it easy to provide sealing of the channels when assembling the plates into a heat exchanger, which also simplifies the assembly process.

 The inventive package of plates for the heat exchanger has a novelty in comparison with the prototype, differing from it by the alternation of protrusions and depressions on both axes of the plane of the insert plate and the edges of these plates with the ability to seal the package during its assembly, ensuring the achievement of a given result.

 The applicant does not know the technical solutions possessing the totality of these essential distinguishing features that ensure the achievement of the desired effect, so he believes that the claimed technical solution meets the criterion of "inventive step".

 The inventive package of plates can be widely used in heat exchangers for utilities, oil and refrigeration industry, thereby meeting the criterion of "industrial applicability".

The invention is illustrated by drawings, which are presented on
- FIG. 1 is a schematic view of a corrugated insert plate, where depressions are marked with crosses and protrusions are marked with dots:
- FIG. 2 is a sectional view of a package of plates for a heat exchanger with corrugations of the same size;
- FIG. 3 is a sectional view of a package of plates for a heat exchanger with corrugations of different sizes.

 The inventive package of plates for a heat exchanger consists of alternating smooth plates 1 stacked in a stack and corrugated insert plates 2 having protrusions 3 and depressions 4, for example, of a hemispherical shape, alternating on both axes of the insertion plane, on the surface (see Fig. 1 and 2 ) The protrusions and depressions can have any other shape and have a different size (see Fig. 3). In this case, smaller corrugations play the role of turbulizers, and larger corrugations play the role of elements that specify the distance between the plates. Due to the alternation on both axes of the insertion plate of the protrusions 3 and depressions 4 on the corrugated insertions 2 between the smooth plates 1 and the insertion plates 2, a certain distance is provided so that channels 5 and 6 are formed for passing heat-exchange fluids. These media can be fed through the heat exchanger plates in any direction. The edges of the insert plates are made smooth, which makes it possible to easily seal the channels for the passage of heat transfer media during assembly using, for example, rubber gaskets (not shown in the drawings).

 The plates can be made of metal sheets with a thickness of 0.3 mm, the insert plates are made, for example, by stamping.

 The plates are collected in a bag by any known method, for example using fasteners (not shown in the drawings). Since the plates are quite thin and the flow direction of the heat transfer media can be any, and the gap between the plates is ensured, the plates can also be assembled into a heat exchanger, for example, by folding them into a pipe.

 When heat transfer media are fed into the channels formed by plates 1 and 2 of the heat exchanger package, the medium runs onto hemispherical protrusions 3, acting as turbulators, and from them part of its flow deviates to the troughs 4 and destroys the stagnant zones in them, intensifying heat transfer.

 Compared with the prototype, the inventive package of plates of the heat exchanger is simpler to manufacture and assemble, has increased heat transfer, thinner plates and smaller sizes.

Claims (1)

 A package of plates for a heat exchanger, consisting of alternating smooth plates adjacent to each other and corrugated insert plates having corrugations on the surface of the corrugations in the form of protrusions and depressions alternating along one axis of the plane of the insert plate, characterized in that the corrugations on the insert plates are made in the form of protrusions and depressions, alternating on both axes of the plane of the insert plate.

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