RU2275569C2 - Heat exchanger - Google Patents

Abstract

FIELD: heat-exchange apparatus.

SUBSTANCE: heat exchanger comprises two collectors with tube banks whose openings are provided with grooves and receive the ends of the flanged pipes. The grooves are spherical, and the edges of the openings are provided with chamfers.

EFFECT: enhanced reliability.

Description

The invention relates to heat exchangers and may find application, for example, in gas coolers after a multistage compressor or its stages.

Known air-cooled heat exchanger containing two collectors with tube plates, in the openings of which the ends of the pipes of the cooler are fixed (see ed. St. USSR No. 378698, F 28 D 1/06, 1973).

A disadvantage of the known device is the low reliability and poor sealing due to unreliable sealing of pipes in the boards.

A known heat exchanger containing collectors with tube plates, in the openings of which the ends of the tubes are flared with grooves (see the book S. S. Berman "Heat exchangers and condensing devices of turbine units", M .: "Mashgiz", 1959, p.23, 27) . A disadvantage of the known device is low reliability, low sealing ability. The known device is suitable only for units operating without a significant difference in operating conditions and working with the same cooler and a cooled medium, where leaks of one medium to another are harmless. For example, both environments are water. For units operating with a frequent change of modes, when the temperature of the media changes repeatedly and the temperature expansions (decreases) of the structural elements acting on the pipe sealing change frequently, the sealing is depressurized and the overflows increase. The device is not suitable for coolers working with flammable (explosive) gases, when no leakage is allowed.

The groove shown in FIG. 10 (prototype sheet 27) has two angles at the bottom of the groove into which the pipe material will not flow when flaring, especially with thick-walled pipes. The lack of contact between the pipe wall and the surface of the groove reduces the tightness and adhesion of the pipe to the board.

The task is to increase reliability in operation, increase sealing.

The problem is solved due to the fact that the grooves in the holes of the tube plates for the flared material of the ends of the pipes are made spherical and the edges of the holes are chamfered, while in the chamfers, in the vicinity of the ends of the pipes, a weld is placed, and the chamfer on the opposite side is spacing between the surface of the pipe and the edge of the hole of the tube plate, excluding the tube touching the edge during operation. The transition from the flared pipe section to its main section is made spherical.

The heat exchanger is shown in the drawings, where:

figure 1 - heat exchanger as part of a heat exchange installation;

figure 2 - element "A", the place of termination of one of the pipes in the tube plate of the collector;

figure 3 - element "A", a hole in the tube plate for flaring the end of the pipe (pipe conditionally not shown).

On a frame 1 with a fan 2 and a drive 3, a heat exchanger is installed with collectors 5.6 and pipe boards 7 and 8 in them. In the pipe boards 7.8, the ends of the heat exchange pipes are fixed 9. In the holes of the pipe boards, spherical grooves 10.11 and chamfers 12.13 are made for fastening the ends of the pipe. To fix the pipes 9 in the boards 7.8, the ends of the pipes are flared along the inner surface. In this case, the pipe material is rolled into spherical grooves 10 and 11. To increase the bond strength and increase the tightness, the pipe and board are welded in the cavity of the bevel 12. The bevel 13 increases the distance from the surface of the pipe 9 to the edge of the board 7.8. An annular, spherical surface 14 eliminates the stress concentrator at the point of transition from one pipe diameter to another.

During operation of the heat exchanger, a hot component to be cooled enters the collector 5. Through the pipes 9, fixed in the pipe boards 7.8, the component passes into the collector 6, from there it is sent to the consumer. The pipes 9 are blown with cold air coming from a fan 2 rotated by the drive 3. The component in the pipes 9 is cooled by an air stream. Spherical grooves 10.11 fix the ends of the pipes from axial displacements and seal the joint of the pipe with the tube plate. The weld in the chamfer 12 increases the strength of the connection and additionally seals the joint. Chamfer 13 increases the distance from the surface of the pipe 9 to the edge of the board 7.8 and eliminates the friction of the pipe on the edge of the board during vibrational movements (vibrations) of the pipe 9 between the collectors 5 and 6 during operation under the influence of a pulsating air flow coming from fan 2. This protects pipes from wear in these places and helps to increase the life of the heat exchanger.

These factors ensure the achievement of the task, increase the reliability in operation, increase the tightness.

A prototype of the device is manufactured and tested, the declared advantages are confirmed, which serves as confirmation of industrial applicability.

Claims (1)

A heat exchanger containing two collectors with tube plates, in the openings of which the ends of the tubes are flared with grooves, characterized in that the grooves in the openings of the tube boards for the flared material of the ends of the pipes are spherical in shape and the edges of the holes are chamfered, with chamfers in the region of the ends of the pipes a weld is placed, and the chamfer on the opposite side is spacing between the surface of the pipe and the edge of the hole, eliminating the tube touching the edge during operation, and the transition from the flared part The pipe weave to its main section is made spherical.

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