The heat exchanger tube in tube"

 

The invention is intended for use in heat exchangers and can be used in the energy industry, in particular in liquid-propellant rocket engines. The invention includes inner and outer cylindrical shell mounted coaxially with the annular gap and forming a cavity for the working fluid, inlet and outlet headers with nozzles and additional shell forming an additional cavity, which is installed in the heat exchanger on the pylons, and the pylons are provided with channels for supplying and discharging the working fluid, and the additional cavities are interconnected through additional holes in the shell. The invention improves the performance of the heat exchanger without increasing its size. 3 Il.

The invention relates to heat exchange apparatus (TA) and can be used in the energy industry, in particular in liquid-propellant rocket engines (LPRE).

A known design of the heat exchanger in the cavity of which is to increase the surface of heat removal is installed in a cylindrical tube made in the form of a retinue in the spatial spiral ribbon located coaxially with the formation of kotatko of this technical solution is because of the large cluttering the path line of the fluid greatly increases the hydraulic resistance of the line and this reduces the useful capacity of the power plant, in particular LRE.

The closest in technical essence of the present invention is a heat exchanger containing the inner and outer cylindrical shell mounted coaxially with the annular gap forming a cavity for the working fluid, inlet and outlet headers with nozzles (SU 567071 A, F 28 D 7/10, 1977). The coolant flowing through the inner membrane, heats or cools the working fluid flowing in the annular gap between the shells.

The main disadvantage of this device is that when the performance improvement THAT increase the surface of heat removal grow its dimensions. This is especially unacceptable to THE one used in the construction of rocket engines, so as to increase the dimensions and weight of the engine as a whole.

The objective of the invention is to remedy these disadvantages and improve THE performance without increasing its size and power reduction power plant.

This object is achieved in that THE type of "pipe in pipe", moderadamente for the working fluid, inlet and outlet headers with nozzles, extra shell, forming an additional cavity, according to the invention an additional shell installed on pylons, which made channels, inlet and outlet of the working body and the additional cavities are interconnected through additional holes in the shell.

The invention is illustrated by drawings, where Fig. 1 shows a longitudinal section of THE Fig. 2 - section a-a in Fig. 1 on the shells of the heat exchanger of Fig. 3 - section b-B in Fig. 1 additional shells.

Principal elements of the proposed design THAT are: 1 - the outer casing; 2 - inner sheath; 3 - inlet manifold; 4 - outlet manifold; 5 - inlet pipe; 6 - outlet pipe; 7 - pole, 8 - pole; 9 - housing with pylons;
10 - supporting lattice;
11 - the internal sheath;
12 - the average additional sheath;
13 - additional outer sheath;
14 - lead pipe to the additional cavities;
15 - exhaust pipe from the secondary cavities;
a, b - holes in the wall, the average additional shell 12;
K - channels in the inner membrane;
L - channels on the outer dopan 1 and 2 internal shell, mounted coaxially with a gap. On the outer surface of the inner shell 2 is made channels K. Shell are connected by soldering to form the cavity for the working fluid. The outer casing 1 is made of the inlet 3 and outlet 4 manifold with nozzles 5 and 6, respectively.

In the cavity of the inner shell 2 of the heat exchanger on the pylons 7, 8 of the housing 9 and the support grid 10 is installed additional shells 11, 12, 13 interconnected by soldering and forming a cavity with the channels M, L

Cavity with channels M, L are interconnected through holes "a", "b", made in the wall of the average additional shell 12.

Case 9 pylon is attached to the outer shell 1. On the housing 9 in the pylons provided with channels for supplying and discharging the working fluid from the inlet 14 and outlet 15 nozzles. Supply pipes 5, 14 and outlet 6, 15 are interconnected.

The heat exchanger works as follows.

Heating or cooling the coolant is supplied into the cavity of the heat exchanger and washes the shell 2, 11 and 13, which are heat-exchange elements made of material having high thermal conductivity.

The working body is divided into two streams.

The first stream through podvodka 2. Passing through the channels, the working fluid is heated or cooled through the outlet manifold 4 and the pipe 6 extends from the heat exchanger.

The second flow of working fluid through the supply pipe 14, the channel in the pylon 8 housing 9 and the hole in the wall, the average additional shell 12 enters the channels M, made on the outer surface of the internal sheath 11. Passing through the channels, the working fluid is heated or cooled, and through holes "b" in the wall of the shell 12 enters the channels L, made on the inner surface of the additional outer shell 13, where a further heat exchange with coolant, then the second thread through the channel in the pylon 7 and the discharge pipe 15 extends from the heat exchanger and mixed with the first stream.

The use of the invention makes it possible to intensify the process of heat transfer due to more developed surface of the heat transfer elements and to improve THE performance without increasing its size.


Claims

The heat exchanger tube in tube" containing the inner and outer cylindrical shell mounted coaxially with the annular gap and forming a cavity for the working fluid, and characterized in that the additional membrane is installed in the heat exchanger on the pylons, which are provided with channels for supplying and discharging the working fluid, and the additional cavities are interconnected through additional holes in the shell.

 

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