The evaporator

 

The invention relates to refrigeration, and particularly to evaporators of refrigerating machines. The evaporator includes at least two plate-fin package. The packages are arranged in an alternating channels for the cooling medium and the channels for the refrigerant. In these channels placed corrugated insert, forming a parallel cells. Channels for the refrigerant are connected respectively from the bottom to the dealer, and the top to collect the collectors. Between packages formed standpipe cavity to drain not evaporated portion of the refrigerant from collecting collector at a dealer. Standpipe cavity connected to said collectors. In collecting manifold installed the bumper, located above the standpipe cavity and connected to paratwada the pipe, installed in the collecting reservoir. Each cell channels for the refrigerant is made with a hydraulic diameter lying in the range of 0.5 to 3.0 mm, and a standpipe cavity made with a minimum cross-sectional dimension of at least 10 mentioned hydraulic diameters. 4 C.p. f-crystals, 6 ill.

The invention relates to refrigeration, in particular, to the evaporators of refrigerating machines. x environments.

The evaporator can find the most widely used in cryogenics, energy, gas and chemical industry, food machinery, etc.,

Known evaporators containing plate-fin package, having arranged in an alternating channels for the cooling medium and the channels for the refrigerant corrugated surfaces inside, forming parallel posted by cell, distributing and collecting manifolds connected to the channels for the refrigerant (see, for example, U.S. patent No. 3151676, CL 165-166, 1970).

In this evaporator standpipe cavity is absent, the cell size is not specified.

The technical result set by the invention, the evaporator is not achieved, because the conditions for the free circulation missing. There is also no data about the size of the cells, providing an intensification of heat transfer.

Also known evaporators containing at least two plate-fin package, having arranged in an alternating channels for the cooling medium and the channels for the refrigerant, and the channels for the refrigerant are installed corrugated insert, forming parallel spaced cells. The evaporator has a distributing and collecting collec).

This evaporator is chosen for the prototype. However, in this evaporator is missing standpipe cavity and there is no data about the size of the cells.

Thus, in this evaporator the technical result set by the invention is not achieved.

The objective of the invention is to provide a reliable in operation of the evaporator with reduced dimensions and weight characteristics.

The technical result achieved by the invention, - the enhancement of boiling heat transfer to the refrigerant and providing conditions for free circulation of the latter.

This technical result is achieved in that the evaporator includes at least two plate-fin package, having arranged in an alternating channels for the cooling medium and the channels for the refrigerant corrugated surfaces inside, forming parallel posted by cell, distributing and collecting manifolds connected respectively top and bottom channels for the refrigerant, and also formed between packages standpipe cavity to drain not evaporated portion of the refrigerant from collecting collector to dealer, also connected to said collectors, collecting manifold installed the bumper, located n is eat each cell channels for the refrigerant is made with a hydraulic diameter, lying in the range of 0.5 to 3.0 mm, and a standpipe cavity made with a minimum cross-sectional dimension of at least 10 mentioned hydraulic diameters.

In private cases, the technical result is achieved by the fact that in the evaporator, characterized by the above features, the axis of the channels for the cooling medium is made perpendicular to the axes of the channels for refrigerants with the formation of cross-exact flow of the refrigerant and the cooling medium; the axis of the channels for the cooling medium is made parallel to the axes of the channels for the refrigerant with the formation of a counter-current flow of the refrigerant and the cooling medium; plate-fin packets are parallel; plate-fin packets counter is inclined at an angle not exceeding 3with the formation of a standpipe cavity uniformly extending from the collecting reservoir to the dealer.

The evaporator illustrated in the drawings, which depict the evaporator with two packages. In the evaporator can be used any number of packages. Options inside tilted packages are not illustrated, since small angle makes them visually indistinguishable from parallel.

In Fig.1 shows a dapc inlet and one outlet manifolds for refrigerated environment.

In Fig.2 is a longitudinal section of the channel for the refrigerant with a corrugated insert of Fig.1.

In Fig.3 is a longitudinal section of the channel for a cooling medium with a corrugated insert of Fig.1.

In Fig.4 depicts a perspective view of the same evaporator, but with two inlet and two outlet manifolds for refrigerated environment.

In Fig.5 - describe the evaporator is a perspective view with cross-accurate scheme in the absence of collectors for cooling medium.

In Fig.6 - the same evaporator, as shown in Fig.5, but with manifolds for refrigerated environment.

The evaporator includes two plate-fin package 1. Each package is placed in an alternating channels 2 for the refrigerant channels 3 for the cooling medium. In each channel 2, 3 placed corrugated surface 4 forming placed parallel to the cells 5, 6. The channels 2 are respectively top and bottom of the connected dealer 7 and collecting 8 collectors refrigerant. Between packages formed standpipe cavity 9, is also connected to the collectors 7, 8. In the collecting reservoir 8 installed bumpers, located above the measuring chamber 9 and is connected to paratwada the pipe 10, is also installed in the collecting reservoir 8. In the particular case of the bump morainic may be very different, for example, in the form of screens, grids, etc., Each cell 5 channels of the refrigerant is made with a hydraulic diameter lying in the range of 0.5 to 3.0 mm, and a standpipe cavity 9 is made with a minimum cross-sectional dimension of at least 10 mentioned hydraulic diameters.

When running on counterflow evaporator can have one for the cooling medium supply manifold 12 and one outlet manifold 13 for the cooling medium. A possible variant, in which each packet has to be cooled environment its inlet 14 and its outlet 15 collectors (see Fig.4).

Plate-fin packets may be slightly (up to 3) oppositely inclined with education standpipe cavity is uniformly expanding in the direction from the collecting reservoir to the dealer.

The proposed evaporator operates as follows.

The refrigerant, such as freon, ammonia, flows from the distributing manifold 7 in the channels 2, i.e. in cell 5, and the cooled medium flows from the supply reservoir (12 or 14) in the channels 3, that is, in cell 6. Thus, the refrigerant receives heat from the cooling medium through the walls of the channels and cells. As a result, the refrigerant boils, evaporates and as a PA is the path which is the bumper, not evaporated portion of the mixture through a standpipe cavity is returned to the reservoir 7, thereby providing for free circulation of the refrigerant. The evaporated portion of the mixture flows into paratwada pipe 10 and then to the corresponding device belonging to the technological scheme, such as a compressor (not shown). As the cooling medium may be air, liquid fuel (gasoline), liquid coolants (antifreeze / coolants, Ecosol), etc., by cooling the atmospheric air inlet and outlet headers are missing, the air using fan blows the appropriate channels 3.

When using the above-mentioned liquid media the last act in the manifolds 12, 14 and are removed through the collectors 13, 15.

Depending on the technology use of the evaporator can be applied as a counter-current and cross-accurate scheme for the movement of the refrigerant and the cooling medium.

The use of inlet and outlet manifolds for each package with a thermal point of view is more advantageous, however, for constructional reasons, in some cases, you have to use the scheme with two collectors.

The choice of the optimal cell size of 5 and a minimum cross-sectional dimension Aviemore high intensity boil, when the cell size is 5 commensurate with the size of the tear in the bladder, under conditions of relatively low hydraulic resistance and the free circulation of the refrigerant.

Claims

1. The evaporator containing at least two plate-fin package, having arranged in an alternating channels for the cooling medium corrugated surfaces inside forming placed parallel to the cells and channels for refrigerant corrugated surfaces inside, forming parallel placed cells connected respectively from the bottom to the dealer, and the top to collect the collectors, and also formed between packages standpipe cavity to drain not evaporated portion of the refrigerant from collecting collector to dealer, also connected to said collectors, collecting manifold installed the bumper, located above the standpipe cavity and connected to paratwada the pipe, installed in the collecting manifold, with each cell channels for the refrigerant is made with a hydraulic diameter lying in the range of 0.5 to 3.0 mm, and a standpipe cavity made with a minimum size of the cross-the cross of the cooling medium is made perpendicular to the axes of the channels for the refrigerant with the formation of cross-exact flow of the refrigerant and the cooling medium.

3. Evaporator under item 1, characterized in that the axis of the channels for the cooling medium is made parallel to the axes of the channels for the refrigerant with the formation of a counter-current flow of the refrigerant and the cooling medium.

4. Evaporator under item 1, characterized in that the plate-fin packets are parallel.

5. Evaporator under item 1, characterized in that the plate-fin packets counter is inclined at an angle not exceeding 3with the formation of a standpipe cavity is uniformly expanding in the direction from the collecting reservoir to the dealer.

 

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