The heat exchanger

 

(57) Abstract:

Usage: as a cooler or condenser, mostly of the air conditioning systems of vehicles. The essence of the invention: reduction of hydraulic losses in the channels of the heat exchanger is ensured by the fact that it is made in the form of a coil of the multi-channel flat tube 1 with external fins, equipped with inlet and outlet manifolds. When the heat exchanger is supplied installed inside the pipe 1 between the said reservoir by a partition 5, the overlapping area of passage mentioned pipe, and additional output 6 input 7 collectors connected to the latter on the go working environment respectively before and after the partition 5. The presence of the partition 5, as well as additional input 7 and output collectors reduces the length of the path passable environment from its entry into the heat exchanger to the exit, leading ultimately to the reduction of hydraulic losses in the channels of the heat exchanger, and thus to improve the heat exchange efficiency. 2 Il.

The invention relates to the field of refrigeration technology and can be used as an air cooler is the local air cooler, containing the coil in the form of pascavale multi-channel tube having at least three branches, connected by rolls connected to the input and output manifolds and equipped to provide the minimum superheat of the refrigerant in the channels of the pipe, at least one mixer, common to all channels (A. C. USSR N 1267133, IPC F 25 39/02). However, for this design of cooler characterized by large hydraulic losses in the channels of the coil, resulting in lower efficiency of heat transfer.

As a prototype of the selected heat exchanger used as a condenser, is made in the form of a coil of finned pascavale multichannel tubes, channels which are connected to inlet and outlet manifolds (S. R. Gopin,C. M. Sabra, Air condensers of small refrigeration machines. M Agropromizdat, 1987, S. 69).However, for this heat exchanger is also characterized by large hydraulic losses in the channels of the coil, resulting in lower efficiency of heat transfer. This is due to the great length of the way, let the refrigerant from the inlet of the heat exchanger to the exit.

The problem to which the invention is directed to develop a compact heat exchanger, oberheitmann the air conditioning system of a vehicle having a high heat transfer capability.

The technical result of the reduction of hydraulic losses in the channels of the heat exchanger.

This technical result is achieved in that the heat exchanger in the form of a coil of finned multi-channel flat tubes with inlet and outlet manifolds, according to the invention, provided with at least one baffle in the pipe, blocking its flow section and located between the said reservoir, and at least one output and one input of additional collectors connected to the pipe in the course of the working environment, respectively, before and after partition.

The presence of the heat exchanger, at least one septum, placed inside the pipe blocking its flow section and appropriately located relative to said reservoir, and at least one output and one input of additional collectors connected to the pipe in the course of the working environment, respectively, before and after partition, reduces) the length of the path, let the refrigerant from the inlet of the heat exchanger to the exit, leading ultimately to reduce hydraulic losses in the channels of the heat exchanger, and therefore more effective the zone of connection of additional input and output manifolds. Heat exchanger in the form of a coil of pascavale multi-channel tube 1 with outer fins 2. The coil is supplied with an input 3 and output 4 collectors, partition 5, is installed inside the pipe 1 in the roll of the coil between the reservoir 3 and 4 and overlying the flow area of the pipe. Channel pipe located downstream of the working environment to the walls 5, is connected to the output collector 6, and to the channels of the pipe located after it, additional inlet manifold 7. To improve the manufacturability of the heat exchanger auxiliary input 7 and output 6 collectors has a common collector chamber 8, which has on both sides of the pipe 1 open ends and separated installed diagonally mentioned by a partition 5 into two parts, one of which serves as a reservoir chamber for more input and more output collector. Around the perimeter of the open end of each chamber W, the pipe is welded pipes 9 and 10 respectively of the inlet and outlet headers.

The heat exchanger works as follows. (An example is shown for operation of the heat exchanger as cooler.) Liquid refrigerant is fed to heat the outer fins 2, in the multi-channel tube 1 is the refrigerant. The steam generated by boiling of the refrigerant in the channels of the tube 1 located in the course of the working environment to the walls 5, via an additional output collector 6 is removed from the heat exchanger. Similarly, the heat exchange process occurs in the channels of the tube 1 located along the working environment after the partition 5. In this case, steam generated in these channels in the boiling of the refrigerant admitted into the heat exchanger through an additional inlet manifold 7, is removed from the heat exchanger through an outlet manifold 4.

As follows from the above, each of the parts of the heat exchanger, as found in the course of the working environment to the walls, and after it, has its input and output manifolds and works as an independent heat exchanger, while having a much smaller length of the channels, which significantly shortens the path of passage of the refrigerant through the coil from its entrance into the heat exchanger to the exit. In addition, compared with the prototype, increases the living section of the channels for the passage of refrigerant. All of this ultimately leads to the reduction of hydraulic losses in the channels of the heat exchanger, th is the length of the pipe, and thus to improve the heat exchange efficiency. In addition, the reduction of hydraulic losses in the channels of the heat exchanger when it is used as an air cooler provides the possibility of applying a more simple thermostatic expansion valves with internal pressure compensation.

The heat exchanger in the form of a coil of finned multi-channel flat tubes with inlet and outlet manifolds, characterized in that it is provided with at least one baffle in the pipe, blocking its flow section and located between the said reservoir, and at least one output and one input of additional collectors connected to the pipe in the course of the working environment, respectively, before and after partition.

 

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