Integration of a delta-p expansion valve for cop-optimal regulation in a high-pressure connection, in particular an internal heat exchanger

Abstract

The invention relates to an expansion valve for regulating the mass flow rate by generating a pressure difference on the expansion valve of a refrigeration or heating cycle. Said expansion valve comprises a base ( 31 ) having a through-hole ( 32 ) that is surrounded by a valve seat ( 33 ), and a valve element ( 34 ) which closes the through-hole ( 32 ) and rests within the valve seat ( 33 ) in a closed position and can be moved relative to the valve seat ( 33 ) in the opening direction on the base ( 31 ). The base ( 31 ) is designed to be inserted into a bore section ( 29 ) of an attachment point ( 26, 27 ) of a connection ( 21 ) of an internal heat exchanger ( 14 ) or into a connection ( 21 ) of a pipe in the refrigeration or heating cycle. The outer circumference ( 46 ) of the base ( 31 ) has a fastening section ( 47 ) that is releasably fastened to the attachment point ( 26, 27 ) of the connection ( 21 ) by means of a complementary fastening section ( 48 ).

1 . Expansion valve for mass flow regulation by a pressure difference in the expansion valve in a refrigeration or thermal circuit, provided with a base body, which comprises a through-passage opening which is surrounded by a valve seat, and with a valve element, which closes the through-passage opening in a closed position and rests in the valve seat, and is moveable in the direction of flow to the valve seat on the base body, wherein the base body is formed for insertion in a bore portion of a connecting point of a connector of an internal heat exchanger, or in a connector of a pipeline in a refrigeration or thermal circuit, and comprises on the outer periphery of the base body an attachment portion, which is detachably mounted with a complementary attachment portion to the connecting point of the connector. 
     
     
         2 . Expansion valve according to  claim 1 , wherein the attachment portion is formed as a screw thread or bayonet fastening. 
     
     
         3 . Expansion valve according to  claim 1 , wherein the attachment portion on the base body is formed as a support surface, which rests on a circumferential, preferably radially aligned, annular ring, which is formed as an attachment portion, and is bordered by a bore portion. 
     
     
         4 . Expansion valve according to  claim 3 , wherein an energy storage element engages with one side of the base body, and fixes the base body to the annular ring. 
     
     
         5 . Expansion valve according to  claim 1 , wherein on the base body adjacent to the attachment portion, a sealing element is provided, which is preferably arranged downstream of the refrigerant to the attachment portion of the base body. 
     
     
         6 . Expansion valve according to  claim 1 , wherein the base body is completely useable from the free end of the connecting point of the connector. 
     
     
         7 . Expansion valve according to  claim 1 , wherein the expansion valve has a pin-shaped form, with its valve closure member being arranged downstream of the through-passage opening, and that the valve element preferably permeates the through-passage opening, whereby an energy saving element is provided upstream, which positions the valve closure member in the valve seat. 
     
     
         8 . Expansion valve according to  claim 1 , wherein the valve closure member comprises once or several times over its extent spread as a bypass a recess, which is arranged on the valve closure member opposite the valve seat. 
     
     
         9 . Expansion valve according to  claim 8 , wherein the at least one recess is formed as a notch. 
     
     
         10 . Expansion valve according to  claim 1 , wherein the base body comprises a guide portion for the valve element extending upstream of the through-passage opening. 
     
     
         11 . Expansion valve according to  claim 1 , wherein one end of the energy saving element engages with the guide portion, and the opposite end engages with the valve element or an adjusting nut arranged thereon. 
     
     
         12 . Expansion valve according to  claim 8 , wherein a spring seat is provided on the adjusting nut, which preferably works as a floating bearing for the energy saving element. 
     
     
         13 . Expansion valve according to  claim 1 , wherein in the opening direction of the valve element on the valve seat an opening cross-section is then provided, which forms a regulation point, independent of the opening position of the valve closure member between the outer periphery of the valve element and the opening cross-section. 
     
     
         14 . Expansion valve according to  claim 1 , wherein the at least one supply opening to or for the through-passage opening is provided at an angle of between 1° and 90°, with an angle of preferably less than 60° in relation to the longitudinal axis of the valve element.