Evaporator

Abstract

An evaporator with a finned tube block with tubes and fins, wherein the tubes are arranged in rows and the fins are arranged between the tubes, with a first collection and distribution box and with a second collection and distribution box. Each of the two collection and distribution boxes has a bottom and a box lid. The respective bottom has openings for inserting the tube ends of the tubes of the finned tube block. The finned tube block is divided into evaporator flows to which groups of tubes of the finned tube block are assigned. The tubes of an evaporator flow each merge end-side into a box area of a collection and distribution box. The respective bottom of the collection and distribution boxes is designed with rim holes for inserting the tube ends in the openings.

What is claimed is: 
     
         1 . An evaporator for an air conditioning unit, the evaporator comprising:
 a finned tube block with a plurality of tubes and fins, wherein the tubes are arranged in two rows so that in each case two tubes are arranged one after the other in a direction of air flow and the fins are arranged between the tubes;   a first collection and distribution box; and   a second collection and distribution box, wherein at least one of the first or second collection and distribution boxes is connected with one of the tube ends of the tubes of the finned tube block,   wherein the first and second collection and distribution boxes each have a bottom and a box lid, the bottom having openings for inserting the tube ends of the tubes of the finned tube block,   wherein in the first and second collection and distribution boxes, partition walls are arranged, which divide the respective interior of the first and second collection and distribution boxes into box areas,   wherein the finned tube block is divided into evaporator flows to which groups of tubes of the finned tube block are assigned,   wherein the tubes of an evaporator flow each merge end-side in a box area of at least one of the first or second collection and distribution boxes,   wherein the respective bottom of the first or second collection and distribution boxes is designed with rim holes for inserting the tube ends in the openings, and   wherein the rim holes are formed circumferentially around the openings and protrude from the bottom on an outer side of the bottom to the fins of the finned tube block.   
     
     
         2 . The evaporator according to  claim 1 , wherein the finned tube block is divided into six evaporator flows, and wherein three evaporator flows are arranged on the air inflow side and three evaporator flows are arranged on the air outflow side. 
     
     
         3 . The evaporator according to  claim 1 , wherein the evaporator has a width in the direction of air flow and the respective bottom has a width in the direction of air flow such that the width of the evaporator is in the range of 60 mm or less, in particular in the range of 50 mm or less and/or such that the width of the bottom is in the range of 55 mm or less, in particular in the range of 50 mm or less. 
     
     
         4 . The evaporator according to  claim 1 , wherein the finned tube block is divided into six evaporator flows, wherein the three evaporator flows on the air outflow side are first flowed through by the refrigerant flowing through the evaporator and then the three evaporator flows on the air inflow side. 
     
     
         5 . The evaporator according to  claim 4 , wherein the evaporator has two broad sides having the air inflow side and the air outflow side, and two narrow sides arranged in the direction of air flow, wherein the three evaporator flows on the air outflow side are flowed through from a first narrow side to a second narrow side, and then the three evaporator flows on the air inflow side are flowed through from the second narrow side to the first narrow side. 
     
     
         6 . The evaporator according to  claim 1 , wherein the box lid is formed by lid areas projecting from the bottom, which are curved from a respective edge of the bottom to the middle of the bottom. 
     
     
         7 . The evaporator according to  claim 1 , wherein the lid areas have outwardly projecting bulges and/or inwardly projecting bulges for reinforcing the box lid. 
     
     
         8 . The evaporator according to  claim 1 , wherein the lid areas have inwardly projecting beads for supporting partition walls for separating box areas and/or end walls for the end-side closure of the collection and distribution box. 
     
     
         9 . The evaporator according to  claim 1 , wherein the bottom has inwardly and/or outwardly projecting beads and/or nubs for supporting at least one partition wall for separating box areas and/or at least one end wall for the end-side closure of the collection and distribution box and/or for reinforcing the bottom. 
     
     
         10 . The evaporator according to  claim 1 , wherein the bottom between two rim holes of two adjacent openings has an inwardly and/or outwardly projecting bead and/or nub for reinforcing the bottom. 
     
     
         11 . The evaporator according to  claim 1 , wherein the air conditioning unit is an air conditioning system of a motor vehicle.