Connection device for an internal heat exchanger

Abstract

The invention relates to a connection device for an internal heat exchanger ( 14 ) having a connection block ( 21 ) comprising a first and a second through hole ( 24, 25 ), wherein an inlet opening ( 26 ) of the first through hole ( 24 ) can be connected on the high pressure side to a connection of the internal heat exchanger ( 14 ), and an outlet opening ( 27 ) of the first through hole ( 24 ) to an inlet of an evaporator ( 16 ), and an inlet opening ( 28 ) of the second through hole ( 25 ) can be connected to an outlet of the evaporator ( 16 ) and an outlet opening ( 28 ) of the second through hole ( 25 ) on the low pressure side to a connection of the internal heat exchanger ( 14 ), wherein a narrowing of the cross section ( 31 ) of the first through hole ( 24 ) is formed in the connection block ( 22 ) between the inlet opening ( 26 ) and outlet opening ( 27 ) and acts as a throttle point.

1 . A connecting device for an internal heat exchanger provided with a connecting block having first and second through bores, wherein an inlet opening of the first through bore is connectable on the high-pressure side to a connector of the internal heat exchanger and an outlet opening of the first through bore is connectable with an entrance of an evaporator, and wherein an inlet opening of the second through bore is connectable with an outlet of the evaporator and an outlet opening of the second through bore is connectable on the low-pressure side with a connector of the internal heat exchanger, wherein between the inlet opening and the outlet opening a cross-sectional constriction of the first through bore is formed within the connecting block and is operable as a throttle point. 
     
     
         2 . The connecting device as claimed in  claim 1 , wherein the cross-sectional constriction realised in the form of a throttle point has a cross-sectional area which is smaller than the cross-sectional area of the outlet opening in the first through bore. 
     
     
         3 . The connecting device as claimed in  claim 1 , wherein the cross-sectional constriction is channel-shaped or nozzle-shaped or stepped. 
     
     
         4 . The connecting device as claimed in  claim 1 , wherein a mass flux flowing through the cross-sectional constriction is controllable by means of a valve closure member of an expansion valve insertable into the first through bore. 
     
     
         5 . The connecting device as claimed in  claim 4 , wherein the expansion valve is controllable by a pressure differential between a high-pressure side upstream of the cross-sectional constriction and a low-pressure side downstream of the cross-sectional constriction, as considered with respect to the flow direction of the refrigerant. 
     
     
         6 . The connecting device as claimed in  claim 4 , wherein the expansion valve insertable into the connecting block is provided with a guiding element accommodating the valve closure member, a restoring device and an adjusting device. 
     
     
         7 . The connecting device as claimed in  claim 6 , wherein the guiding element is realised as a sleeve in the form of a perforated disc or as a sleeve having key-shaped tongues. 
     
     
         8 . The connecting device as claimed in  claim 6 , wherein the guiding element and the valve closure member are firmly connected to each other or are integrally formed as a single piece. 
     
     
         9 . The connecting device as claimed in  claim 6 , wherein the adjusting device comprises an adjusting nut. 
     
     
         10 . The connecting device as claimed in  claim 9 , wherein the adjusting nut is provided with recesses which are realised at least as recesses in the shape of arcuate segments formed on the outside circumference, or as through holes. 
     
     
         11 . The connecting device as claimed in  claim 1 , wherein the inlet opening of the first through bore and the outlet opening of the second through bore are formed within a shared connecting bore. 
     
     
         12 . The connecting device as claimed in  claim 11 , wherein the connecting bore is realised as a stepped bore and serves for connecting a double-tube internal heat exchanger. 
     
     
         13 . The connecting device as claimed in  claim 11 , wherein the longitudinal axis of the cross-sectional constriction is oriented radially with respect to the connecting bore and merges with the connecting bore. 
     
     
         14 . The connecting device as claimed in  claim 11 , wherein the outlet opening of the second through bore is arranged coaxially with the connecting bore. 
     
     
         15 . The connecting device as claimed in  claim 11 , wherein between a frontal end of an outer tube of the internal heat exchanger and an inner tube protruding therefrom, at least one screen element is provided and said screen element extends all over the inlet opening of the first through bore. 
     
     
         16 . The connecting device as claimed in  claim 15 , wherein the screen element is tubular or frusto-conical in shape and has at least two sealing members such that one of said sealing members forms a tight seal between the outer tube of the internal heat exchanger and a bore section of the connecting bore and the other sealing member forms a tight seal of the inner tube and outer tube of the internal heat exchanger with respect to the connecting bore. 
     
     
         17 . The connecting device as claimed in  claim 1 , wherein the internal heat exchanger is connectable in a hermetically tight manner with respect to the connecting block. 
     
     
         18 . The connecting device as claimed in  claim 9 , wherein the adjusting device comprises a holder capable of being arranged on the adjusting nut and operable to accommodate the restoring device. 
     
     
         19 . The connecting device as claimed in  claim 11 , wherein the connecting bore is realized as a blind bore formed in a side wall of the connecting block.