RU2241936C1 - Plate heat exchanger - Google Patents

Abstract

FIELD: power machinery and heat-and-power engineering, particularly equipment for cooling liquids and gases.

SUBSTANCE: heat exchanger comprises plates with ribs arranged from both plate sides and defining channels between plate and rib surfaces. At least one additional rib is connected to each side of each plate so that additional rib is located at plate end and spaced a distance from the nearest rib. The distance is equal to thickness of rib connected to opposite end of the same plate side.

EFFECT: improved gas or liquid cooling ability and improved heat exchanger manufacturability.

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Description

The invention relates to the field of power engineering and power engineering and is intended primarily for cooling liquids and gases.

Plate heat exchangers are known comprising smooth plates and corrugated plates assembled in a bag to form channels between the surfaces of smooth and corrugated plates. Corrugated plates perform the function of ribbing for smooth plates and can increase the heat transfer intensity between the working media separated by smooth plates [1].

In such heat exchangers, the efficiency of heat transfer between smooth and corrugated plates, as well as the tightness of the flow part between smooth plates, depend on the quality of the soldering, which is difficult to ensure in the manufacture of the heat exchanger and which is deteriorated by vibration and oxidation during its operation. In addition, the presence of two plates of different design in the heat exchanger package leads to a deterioration in its manufacturability and a rise in price.

Closest to the claimed is a plate heat exchanger containing plates, on one side of which plate-shaped ribs are installed, and on the other hand, at least along the edges of the plate, additional ribs are installed to form landing grooves for plate ribs, and the distance between the additional ribs forming the landing the groove is equal to the thickness of the plate edge. The plates are packaged so that the plate ribs of one plate enter into the grooves between the additional ribs of the adjacent plate with the formation of channels between the surfaces of the plates and plate ribs [2].

If the heat exchanger package is assembled from identical finned plates, then for one of the working media having different thermophysical properties (in particular, the thermal conductivity and, therefore, the heat transfer coefficient), the flow part of the heat exchanger will be used inefficiently [3]. If for each working medium the required individual geometry of the flow part is provided (i.e., the height and thickness of the ribs, as well as the distance between them), then at least two types of finned plates must be installed in the bag, which reduces the degree of unification of the heat exchanger and impairs its manufacturability . Low manufacturability and inefficiency of heat transfer for one of the working environments are obvious disadvantages of the prototype.

Object of the invention: improving the cooling of gas and liquid and improving the manufacturability of the design of the heat exchanger.

The problem is achieved in that in the known plate heat exchanger containing plates finned on both sides and assembled into a bag with the formation of channels between the surfaces of the plates and ribs, at least one additional rib located on the edge of the plate is made on both sides of each plate remote from the nearest rib by a distance equal to the thickness of the rib located on the opposite edge of the same side of the plate.

The invention is illustrated by drawings, where figure 1 schematically shows a package of the inventive plate heat exchanger, made according to a cross circuit, and figure 2 a package of a plate heat exchanger made according to a counter-current scheme.

The plate heat exchanger contains plates 1 with ribs 2 on one surface and ribs 3 on the opposite surface, assembled in a package so that channels 4 are formed between the surfaces of the plate 1 and ribs 2 and channels 5 are also formed between the surfaces of the plate 1 and ribs 3, in addition, on one side of the plate 1 there is an additional rib 6 located on the edge of the plate 1 and remote from the nearest edge 2 by a distance equal to the thickness of the rib 2 located on the opposite edge of the same side of the plate 1, and on the other side the layer On the other hand, an additional rib 7 is made, located on the edge of the plate 1 and remote from the nearest edge 3 by a distance equal to the thickness of the rib 3 located on the opposite edge of the same side of the plate 1. Thus, between the additional rib 6 and the edge 2 nearest to it, and also between the additional rib 7 and the nearest rib 3, landing grooves 8, 9 are formed, in which, when collecting the plates 1, the package includes the corresponding ribs 2 and 3 of the neighboring plates 1, which ensures the tightness of the channels 4 and 5.

The heat exchanger package with the cross movement of the working media is formed by plates 1 made with the cross arrangement of the fins 2, 6 with fins 3, 7 (Fig. 1). The heat exchanger package with countercurrent movement of the working media is formed by plates 1 made with a parallel arrangement of fins 2, 6 with fins 3, 7 (Fig. 2).

The plate heat exchanger operates as follows (Fig.1, 2). The working medium A flows through the channels 5, interacting through heat transfer through the plates 1 with ribs 2 and 3 with the working medium B flowing through the channels 4. In this case, the geometric dimensions of the ribs 3 and the distance between them are selected so as to ensure the least possible hydraulic losses and the most possible heat transfer coefficient and heat transfer area for medium A, which has individual thermophysical properties, in this case, the shape and surface roughness of the plates and the ribs, the flow regime of the working medium A, its temperature, viscosity, density and other factors [3], and the geometric parameters of the ribs 2 and the distance between them are chosen in such a way as to provide the least possible hydraulic losses and the most possible heat transfer coefficient and heat transfer area for the medium In, also possessing individual thermophysical properties [3].

Thus, the proposed heat exchanger allows, compared with previously known, to improve the cooling of gas and liquid and to provide a high degree of unification of the design of the heat exchanger, that is, its high adaptability.

Literature.

1. UK application No. 2073395, MKI F 28F 21/08, 3/02. A heat exchanger for cooling high temperature fluid. BI No. 4834, publ. 10/14/81.

2. Japanese application No. 61-14438, MKI F 28D 9/00, F 28F 3/02. Air conditioner heat exchanger. BI No. 5-361, publ. 04/18/86.

3. Heat transfer. Textbook for high schools. V.P. Isachenko, V.A. Osipova, A.S. Sukomel. - M .: Energoizdat, 1981.

Claims (1)

A plate heat exchanger comprising plates finned on both sides and assembled into a bag to form channels between the surfaces of the plates and ribs, characterized in that at least one additional rib is located on both sides of each plate located on the edge of the plate and remote from the nearest rib at a distance equal to the thickness of the rib located on the opposite edge of the same side of the plate.

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