Multi-layer evaporator for motor vehicle air-conditioning circuit

Patent metadata

Field	Value
Publication number	US-9683764-B2
Application number	US-201214344918-A
Country	US
Kind code	B2
Filing date	Sep 13, 2012
Priority date	Sep 16, 2011
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Evaporator, notably for motor vehicle air-conditioning circuit. According to the invention, the evaporator ( 1 ), which comprises three layers—upstream ( 2 ), intermediate ( 3 ) and downstream ( 4 )—through which there flows a coolant that enters the evaporator ( 1 ) via the intermediate layer ( 3 ) and leaves the evaporator via the upstream layer ( 2 ) to cool an air flow (A) passing in succession across said upstream ( 2 ), intermediate ( 3 ) and downstream ( 4 ) layers, comprises means ( 5 E) for inducing a pressure drop between the outlet of the intermediate layer ( 3 ) and the inlet of the downstream layer ( 4 ).

First claim

The invention claimed is:

1. An evaporator ( 1 ) for a motor vehicle air conditioning circuit the evaporator ( 1 ) comprising at least three layers ( 2 , 3 , 4 ), respectively being an upstream, an intermediate and a downstream layer, extending in parallel planes, each layer ( 2 , 3 , 4 ) including a plurality of canals ( 5 ) through which a refrigerant, that is to be evaporated in order to cool an airflow (A) passing in succession across the upstream ( 2 ), intermediate ( 3 ) and downstream ( 4 ) layers, is intended to circulate in a predefined circulation pass, wherein:
the refrigerant enters the evaporator ( 1 ) at a lateral face (F 1 ) via the intermediate layer ( 3 ) and leaves the evaporator ( 1 ) via the upstream layer ( 2 ) having passed through the downstream layer ( 4 ); and
the evaporator ( 1 ) comprises means ( 5 E) positioned at a longitudinal end of the downstream layer ( 4 ) opposite the lateral face (F 1 ) for introducing a pressure drop between an outlet of the intermediate layer ( 3 ) and an inlet of the downstream layer ( 4 ).

2. The evaporator ( 1 ) as claimed in claim 1 , wherein the pressure drop obtained by the means ( 5 E) for introducing a pressure drop is between 0.5 bar and 1 bar.

3. The evaporator ( 1 ) as claimed in claim 2 , wherein the means ( 5 E) for introducing a pressure drop include at least one end canal ( 5 E) of the downstream layer ( 4 ), through which the refrigerant passes after the refrigerant has passed through the intermediate layer ( 3 ).

4. The evaporator ( 1 ) as claimed in claim 2 , wherein the means ( 5 E) for introducing a pressure drop include at least one external tube, of predetermined cross section, which connects the intermediate layer ( 3 ) to the downstream layer ( 4 ) in such a way that the refrigerant, having passed through the intermediate layer ( 3 ), is delivered to the downstream layer ( 4 ).

5. The evaporator ( 1 ) as claimed in claim 2 , wherein an evaporator refrigerant inlet (E) and outlet (S) occur on the lateral face (F 1 ) of the evaporator ( 1 ).

6. The evaporator ( 1 ) as claimed in claim 2 , further comprising a connection ( 8 ) allowing the refrigerant to be transferred from the downstream layer ( 4 ) to the upstream layer ( 2 ).

7. The evaporator ( 1 ) as claimed in claim 1 , wherein the means ( 5 E) for introducing a pressure drop include at least one end canal ( 5 E) of the downstream layer ( 4 ), through which the refrigerant passes after the refrigerant has passed through the intermediate layer ( 3 ).

8. The evaporator ( 1 ) as claimed in claim 7 , wherein the canals ( 5 ) of each of the layers ( 2 , 3 , 4 ) include individual tubes ( 5 ) connected at their two ends by a first and a second header tank ( 6 , 7 ), comprising means for distributing the refrigerant in the layers ( 2 , 3 , 4 ) and for ensuring the predefined circulation of the refrigerant through the tubes ( 5 ); and in which the header tanks ( 6 , 7 ) are configured to cause all of the refrigerant, having passed through the intermediate layer ( 3 ), to circulate through the end canal ( 5 E) of the downstream layer ( 4 ), so that the end canal ( 5 E) delivers the refrigerant to the downstream layer ( 4 ).

9. The evaporator ( 1 ) as claimed in claim 7 , wherein an evaporator refrigerant inlet (E) and outlet (S) occur on the lateral face (F 1 ) of the evaporator ( 1 ).

10. The evaporator ( 1 ) as claimed in claim 1 , wherein the means ( 5 E) for introducing a pressure drop include at least one external tube, of predetermined cross section, which connects the intermediate layer ( 3 ) to the downstream layer ( 4 ) in such a way that the refrigerant, having passed through the intermediate layer ( 3 ), is delivered to the downstream layer ( 4 ).

11. The evaporator ( 1 ) as claimed in claim 10 , wherein an evaporator refrigerant inlet (E) and outlet (S) occur on the lateral face (F 1 ) of the evaporator ( 1 ).

12. The evaporator ( 1 ) as claimed in claim 1 , wherein an evaporator refrigerant inlet (E) and outlet (S) occur on said lateral face (F 1 ) of the evaporator ( 1 ).

13. The evaporator ( 1 ) as claimed in claim 1 , further comprising a connection ( 8 ) allowing the refrigerant to be transferred from the downstream layer ( 4 ) to the upstream layer ( 2 ).

14. A tank of a heating, ventilation and/or air-conditioning installation for a motor vehicle interior comprising an evaporator ( 1 ) as specified in claim 1 .

15. The evaporator ( 1 ) as claimed in claim 1 , wherein the longitudinal end is near a lateral face (F 2 ) of the evaporator ( 1 ), the lateral face (F 2 ) being opposite the lateral face (F 1 ).

Assignees

• Moreau Sylvain
• Busson Francois
• Haller Regine
• Yahia Mohamed
• Nicolas Bertrand
• Valeo Systemes Thermiques

Inventors

• Moreau Sylvain
• Busson Francois
• Haller Regine
• Yahia Mohamed
• Nicolas Bertrand

Classifications

• F28D1/05391

  with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators · CPC title

• F25B39/02

  Evaporators · CPC title

• F25B39/022 Primary

  with plate-like or laminated elements · CPC title

• F28F9/026 Primary

  with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits · CPC title

• F28D2021/0085

  Evaporators · CPC title