FR2523286A1 - HEAT TRANSMISSION DEVICE, IN PARTICULAR A HEAT PUMP CONDENSER - Google Patents

Abstract

The invention relates to a heat exchanger (1), in particular condenser for the cooling medium in heat pumps, which, between centrally arranged supply and removal pipes in a cylindrical container (2) sealed with a cover (4) and bottom (3), has pipe coils (7 to 14) for the water throughput, which are connected parallel to one another and which extend spirally in one plane from inside outwards and in a plane offset in the axial direction spirally from outside inwards, and which has a pressure pipe (16) and a suction pipe (17) for the cooling medium. To simplify the soldering work necessary and at the same time to guarantee an approximately uniform water throughput through the pipe coils, it is proposed according to the invention that each pipe coil (7 to 14) has its own inlet pipe (7' to 14') and its own outlet pipe (7'' to 14'') which open respectively into a common supply duct (5) in the bottom (3) and into a common removal duct (6) in the lid (4) of the heat exchanger (1).

Description

Heat transfer device
The present invention relates to a heat transmission device, in particular a condenser for the refrigerant in heat pumps, comprising, in a cylindrical tank closed by a cover and a bottom, coils for the passage of water, mounted parallel to each other between a centrally arranged supply pipe and a discharge pipe, coils which spiral from inside to outside in the same plane and spiral from outside to outside inside in a plane axially offset from the first, the device also comprising a delivery pipe and a suction pipe for the refrigerant.

 In a heat transfer device according to the prior art, for example according to the German utility model NO 80 34 878, the finned coils are connected to a common inlet or inlet tube and to an outlet tube or also common starting point. But in this case it is necessary to carry out expensive junctions by welding between the pipes and the finned coils. Due to the staggered arrangement of the finned coils and their connection to the common inlet and outlet pipes, there are also different lengths, and therefore different water flow rates in the different finned coils.

 The present invention therefore aims to provide a heat transmission device of this known type, but constructed so that the necessary welding operations can be simplified, and at the same time an approximately equal water flow can be insured in the streamers.

 This objective is achieved, according to the invention, thanks to the fact that each coil has its own inlet tube and an outlet tube which is also its own, the respective inlet and outlet tubes opening into a channel. common supply in the bottom and in a drain channel also common in the cover of the heat transmission device.

 Due to the movement in the area of the supply and discharge channels, the welding work is essentially facilitated, in particular in the case where, according to a preferred embodiment of the invention, the inlet tube and the outlet tube are respectively formed by the curved ends of a coil.

 Due to the fact that each coil has its own inlet tube and its own outlet tube, substantially equal lengths or equal "paths" of water are obtained, and therefore substantially equal water flows.

 It is recommended to connect the inlet and outlet pipes respectively to a perforated disc of the supply channel and the discharge channel; a circular arrangement of the inlet and outlet pipes is then preferable, in particular a layout in several concentric circles.

 The manufacture of the heat transmission device is considerably simplified, when, according to a preferred embodiment of the invention, the inlet and outlet pipes are arranged parallel to each other, the inlet pipe each coil preferably located at the outlet pipe which corresponds to it; but according to another possible embodiment of the invention, the respective inlet and outlet pipes could also be offset relative to each other.

 The second objective of the invention can be satisfactorily achieved, in particular in the case where the coils, including the corresponding inlet and outlet pipes, have the same length.

 It is further recommended that the coils of the heat transmission device which match two by two in their arrangement, including the inlet and outlet pipes associated therewith, have the same construction. In this case, the coils which are directly adjacent to the supply channel and the discharge channel, the two coils which immediately follow them on either side, etc., have the same construction.

 As a result, the coils can easily be replaced, the number of coils of different construction (including the inlet and outlet pipes) being halved. For this reason also, an even number of coils is preferable in the heat transfer device.

 As in case of an increase in the number of coils, neither the surface of the perforated discs nor the free space between the coils is sufficient for the installation of the inlet pipes and the outlet pipes, it is proposed, according to the invention, to combine the coils into groups and to arrange in series the respective corresponding coils of the groups.

The invention will now be described in more detail by means of the following embodiment and the attached drawings, in which
Figure 1 is a longitudinal section of a heat transfer device comprising eight finned coils
Figure 2 is a cross section along the line AA in Figure 1
FIG. 3 is a perspective view of the interior of a heat transmission device, on which the bottom and the cover of the cylindrical tank are partially separated, and
Figure 4 shows a heat transfer device comprising two groups of finned coils mounted in series.

 The heat transmission device (1) according to Figures 1 to 3 consists of a cylindrical tank (2) to which are welded a bottom (3) and a domed cover (4).

The bottom (3) and the cover (4) are respectively crossed, substantially at their center, by a supply channel (5) and a discharge channel (6) both having a conical shape and which are intended for passage some water. Between the channels (5) and (6) are arranged a number (in this embodiment, there are eight), of serpentine coils mounted in parallel (7 to 14), which spiral from the inside outwards in the same plane and also in a spiral, but from the outside inwards, in another plane offset axially from the first.

The finned coils 7 to 14 are each connected, by a respective inlet tube 7 'to 14' and by a respective outlet tube 7 "to 14", to a perforated disc (15) placed in the supply channel (5) and in the discharge channel (6).

In FIGS. 2 and 3, the corresponding holes, arranged in a circle, of the perforated disc (15), are designated respectively by the corresponding numerical references of the finned coils 7 to 14. In the present embodiment, the inlet pipes 7 'to 14' and the outlet pipes 7 "to 14" consist respectively of the curved ends of the finned coils 7 to 14. The inlet pipes 7 'to 14' and the outlet pipes 7 "to 14" are arranged parallel to each other. In Figure 3 is shown, for clarity, only the finned coil (11) with its inlet pipe (11 ') and its outlet pipe (11 "). In this case, the pipe inlet (11 ') is offset from the outlet pipe (11 "), and therefore the perforated discs (15) do not have the same arrangement in the supply channel (5) and in the discharge channel (6).

 We see that the finned coils (7) and (14), (8) and (13), (9) and (12), (10) and (11) (including the inlet pipes (7 ') to (14 ') and the corresponding outlet pipes (7 ") to (14")) have the same construction and can therefore be easily replaced.

 In addition, there is a discharge pipe (16) for the refrigerant vapor KM in the cover (4) and a suction pipe (17) for the condensed refrigerant in the bottom (3) .

 The water which arrives through the supply channel (5) circulates in the inlet pipes (7 ') to (14'), then in the coils (7) to (14) and in the outlet pipes (7 ") to (14"), before leaving the device (1) for transmitting heat through the exhaust channel (6). It is then easy to realize that the lengths, that is to say the paths followed by the water (7 '+ 7 + 7 "= ... = 11' + 11 + 11" = ... = 14 '+ 14 + 14 ") are equal, so that equal water flows are obtained.

 The KM refrigerant vapor which arrives through the discharge pipe (16) is deflected by the exhaust channel (6) acting as a baffle, it circulates on the finned coils (7) to (14) , it condenses and drips into the lower part of the tank (2).

The height of the refrigerant is indicated here by the line (18). To improve heat transmission, the external face of the supply channel (5) can be fitted with ribs or fins (19).

 In the device (1) for transmitting heat according to FIG. 4, the finned coils (7) to (14) and (20) to (27) form two groups of eight coils each. There are two groups, mounted one behind the other, of corresponding serpentine fins 7/20, 8/21, ..., 13/26 and 14/27 respectively. The relationships between the two groups are explained by means of the series connection of the respective fifth coils (11) and (24) of each group. The junction point is designated by the reference numeral (28). Water therefore circulates in the inlet pipe (24 "); in the finned coil (24), in the outlet pipe (24") of the latter, then in the inlet pipe (11 '), in the finned coil (11) and finally in the outlet pipe (11 ").

 The heat transmission devices (1) can be used not only - as is the case here as condensers, but also as evaporators.

Claims (12)

 1. Heat transmission device (1), in particular condenser for the refrigerant in heat pumps, comprising, in a cylindrical tank (2) closed by a cover (4) and a bottom (3), coils (7 to 14) for the passage of water, mounted parallel to each other between a centrally arranged supply pipe and a discharge pipe, coils which spiral from inside to outside in the same plane and in a spiral from the outside towards the inside in a plane offset axially from the first, the device also comprising a delivery pipe (16) and a suction pipe (17) for the refrigerant,  characterized in that each coil (7 to 14) has its own inlet pipe (7 'to 14') and its own outlet pipe (7 "to 14"), which lead respectively into a common supply channel (5) in the bottom (3) and in a common evacuation channel (6) in the cover (4) of the heat transmission device (1).  2. Heat transmission device according to claim 1, characterized in that the inlet pipe (7 'to 14') and the outlet pipe i7 "to 14") of each coil (7 to 14) are constituted by the respective curved ends of the corresponding coil.  3. Heat transmission device according to claim 1 or 2, characterized in that the inlet pipe (7 'to 14') and the outlet pipe (7 "to 14") of each coil are connected to a disc respective perforated (15) of the feed channel (5) and the discharge channel (6).  4. A heat transmission device according to claim 3, characterized in that the inlet pipes (7 'to 14') and the outlet pipes (7 "to 14) are arranged in a circle.  5. A heat transmission device according to claim 4, characterized in that the inlet pipes (7 'to 14') and the outlet pipes (7 "to 14") are arranged in several concentric circles.  6. A heat transmission device according to any one of claims 1 to 5, characterized in that the inlet pipes (7 'to 14') and the outlet pipes (7 "to 14") are arranged parallel l to one another.  7. Heat transmission device according to claim 6, characterized in that the inlet pipes (7 'to 14') and the outlet pipes (7 "to 14") of each coil (7 to 14) are flush.  8. Heat transmission device according to claim 6, characterized in that the inlet pipe (7 'to 14') and the outlet pipe (7 "to 14") of each coil (7 to 14) are offset one of the other.  9. Heat transmission device according to any one of claims 1 to 4 and 6 to 8, characterized in that the coils (7 to 14), including the inlet pipes (7 'to 14') and the outlet pipes (7 "to 14") which correspond to them, have the same length.  10. A heat transmission device according to any one of claims 1 to 9, characterized in that the coils (7/14, 8/13, 9/12, 10/11) which correspond two by two by their arrangement , including the inlet pipes (7 'to 14') and the outlet pipes (7 "to 14") which correspond to them, have the same construction.  11. A heat transmission device according to claim 10, characterized in that there is provided an even number of coils (7 to 14).  12. A heat transmission device according to any one of claims 1 to 11, characterized in that the coils (7 to 14, 20 to 27) are joined in groups, the coils (7/20, ..., 14 / 27) which correspond two by two in the groups being connected in series (Figure 4).