Limiter of flow-over of a heat-carrying agent between pipes and the housing in a heat-exchanging apparatus

FIELD: the invention is meant for heat-exchanging and may be used in compact heat-exchangers made of pipes and a housing which are applied at flying vehicles.

SUBSTANCE: the limiter of flow-over of the heat-carrying agent between pipes and the housing in the heat-exchanging apparatus is fulfilled in the form of radial bulkheads installed in parallel to the axis of the housing. The limiter has elements in the form of balls located between the housing, pipes and radial bulkheads, the diameter of elements exceeds the magnitude of gaps between pipes. At that mentioned elements are fulfilled out of polymeric materials.

EFFECT: the invention allows to improve heat-exchanging.

2 dwg

 

The invention relates to the field of heat transfer, namely, devices for providing directional movement of fluids, and can be used, in particular, in a compact shell and tube heat exchangers used on aircraft.

Known limiter contamination of fluid between the pipe and casing in heat exchange apparatus, containing a sleeve consisting of two attached to opposite ends of the pipe pieces and placed between the last length of pipe plate, with part of the sleeve is made in the form of rings attached to opposite sides of the plate, placed between adjacent tubes [1]. However, this limiter cannot be used for compact heat exchangers because of the small distance between the pipes is insufficient to secure the pipe rings limiter.

The closest technical solution, selected as a prototype, is the limiter contamination of fluid between the pipe and casing in heat exchange apparatus, made in the form of radial partitions, installed parallel to the axis of the casing [2]. However, when using these constraints in a compact shell and tube heat exchangers due to the presence of gaps between the radial walls and pipes, resulting in production due to deviations of the size of the ditch and form elements of the heat exchanger and is comparable in magnitude with the gaps between the pipes, unable to avoid contamination of the environment between the pipe and casing, with a portion of the coolant passes into the space between the pipe and casing, without participating in the heat exchange process, which degrades the efficiency of the heat exchanger.

The aim of the invention is the intensification of heat transfer.

This goal is achieved by the fact that the limiter contamination of fluid between the pipe and casing in heat exchange apparatus, made in the form of radial partitions, installed parallel to the axis of the casing, contains elements of spherical shape, is placed between the casing pipe and the radial walls, the diameter of the elements exceeds the magnitude of the gaps between the pipes, these elements are made of polymeric materials.

Comparative analysis of the prototype shows that the claimed limiter contamination of fluid between the pipe and casing in heat exchange apparatus contains elements of spherical shape, is placed between the casing pipe and the radial walls, the diameter of the elements exceeds the magnitude of the gaps between the pipes, these elements are made of polymeric materials.

Thus, the proposed device complies with the criteria of the invention of “novelty.”

The comparison of the proposed solutions not only prototype, but also with other technical solutions is the art did not reveal any sign, distinguish the claimed technical solution from above, which allows to conclude that the criterion of “substantial differences”.

Figure 1 schematically illustrates the limiter contamination of coolant, installed in the heat exchange apparatus, figure 2 - node a in figure 1.

The limiter contamination 1 contains radial partitions 2, installed parallel to the axis of the casing 3 heat exchanger 4, items 5 spherical shape, is placed between the casing 3, the tube bundle 6 and the radial partition walls 2. Tube bundle 6 includes a tube 7. The diameter D of the 5 elements is greater than the magnitude of the gaps S between the pipes 7. The elements 5 are made of polymeric materials, for example Teflon.

When the coolant flows across the tubes 7 items 5 taper 1 prevent partecke fluid between the pipe 7 and the casing 3 and directs the flow inside the tube bundle 6, the flow of the heat carrier is involved in the heat exchange, resulting in the intensification of heat transfer.

As shown by tests conducted at JSC FFP “heat Exchanger” on oil-water shell and tube heat exchanger containing a bundle of tubes with a diameter of 3 mm with the distance between the tubes 1 mm and the proposed limiter contamination, filling the space between the casing of the heat exchanger, tube bundle and radial lane the villages spherical elements with a diameter of 4 mm increased the efficiency of heat transfer by 15%.

Thus, the proposed solution contributes to the intensification of heat transfer in a slight increase in the mass of the heat exchanger, which is especially important for compact heat exchangers, used on aircraft.

Sources of information

1. Asssss No. 642595 from 05.01.1981.

2. Afras, Matisic. Calculation and design of heat exchangers. The pens. from English., M, Atomizdat, 1971.

The limiter contamination of fluid between the pipe and casing in heat exchange apparatus, made in the form of radial partitions, installed parallel to the axis of the casing, characterized in that it contains elements of spherical shape, is placed between the casing pipe and the radial walls, the diameter of the elements exceeds the magnitude of the gaps between the pipes, these elements are made of polymeric materials.



 

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