Device for controlling a fluid mass flow for a device for compressing a gaseous fluid and device for compressing a gaseous fluid

Abstract

A device for controlling a fluid mass flow for a device for compressing a gaseous fluid from a low pressure level to a high pressure level. The device has a housing with fluid connections acted upon at different pressure levels, and a closure element arranged wherein it can be moved in a translatory manner within the housing along a longitudinal axis, with effective surfaces assigned to the fluid connections. The closure element is formed to regulate a flow cross-section of a flow path extending between a first fluid connection and a second fluid connection. The housing has a receiving opening for receiving the closure element, which is formed in at least two pieces from a primary segment and a secondary segment. The primary segment and the secondary segment are each guided within the receiving opening of the housing and are each arranged completely surrounded by the housing.

What is claimed is: 
     
         1 . A device for controlling a fluid mass flow for a device for compressing a gaseous fluid from a low pressure level to a high pressure level, the device comprising:
 a housing with fluid connections acted upon at different pressure levels; and   a closure element arranged within the housing so as to be movable in translation along a longitudinal axis and having effective surfaces associated with the fluid connections, wherein the closure element controls a flow cross section of a flow path extending between a first one of the fluid connections and a second one of the fluid connections, wherein the housing has a receiving opening for receiving the closure element, and the closure element is formed from a primary segment and a secondary segment in at least two pieces, wherein the primary segment and the secondary segment of the closure element are each guided inside the receiving opening of the housing and are each arranged completely surrounded by the housing.   
     
     
         2 . The device according to  claim 1 , wherein the primary segment of the closure element is sealed to the housing via at least one first sealing element and the secondary segment of the closure element is sealed to the housing via at least one second sealing element in a fluid-tight and pressure-tight manner. 
     
     
         3 . The device according to  claim 1 , wherein the housing is formed in at least two parts from a first housing element and a second housing element, wherein the primary segment of the closure element is arranged guided within the first housing element and the secondary segment of the closure element is arranged guided within the second housing element. 
     
     
         4 . The device according to  claim 1 , wherein the closure element is formed to be cylindrical. 
     
     
         5 . The device according to  claim 4 , wherein the primary segment of the closure element is formed with a primary segment diameter and the secondary segment of the closure element is formed with at least two sections with respective different outer diameters. 
     
     
         6 . The device according to  claim 4 , wherein the primary segment and the secondary segment of the closure element ach have an axis of symmetry which are arranged on the longitudinal axis or parallel and spaced apart from one another and parallel to the longitudinal axis. 
     
     
         7 . The device according to  claim 4 , wherein the closure element forms a sealing seat on a first end face with the housing. 
     
     
         8 . The device according to  claim 7 , wherein the primary segment of the closure element is aligned with a second end face, distal to the first end face, pointing towards a first end face of the secondary segment of the closure element. 
     
     
         9 . The device according to  claim 5 , wherein a volume, which is delimited by the housing and the closure element with an annular effective surface with a first outer diameter of the closure element, and the primary segment diameter of the closure element, as an inner diameter, is acted upon by the fluid at the low pressure level and is formed to be connected to a third one of the fluid connections of the housing. 
     
     
         10 . The device according to  claim 9 , wherein a volume delimited by the housing, and a second end face of the closure element, distal to the first end face, is acted upon by a level of the ambient pressure and is formed to be connected to the environment via a fourth one of the fluid connections of the housing. 
     
     
         11 . The device according to  claim 5 , wherein a volume, which is delimited by the housing and the closure element with an annular effective surface with a first outer diameter of the closure element and a second outer diameter of the closure element as an inner diameter, each in particular of the secondary segment of the closure element, is acted upon by the fluid at a level of a counter pressure and is formed to be connected to the first one of the fluid connections of the housing. 
     
     
         12 . The device according to  claim 11 , wherein a first fluid connection is formed, which extends from the first one of the fluid connections to the volume delimited by the housing and the closure element with the annular effective surface with the first outer diameter of the closure element and the second outer diameter of the closure element as an inner diameter, each in particular of the secondary element of the closure element. 
     
     
         13 . The device according to  claim 12 , wherein a second fluid connection is formed, which extends from the first fluid one of the connections to the volume delimited by the housing and the closure element with the annular effective surface with the first outer diameter of the closure element, and a primary segment diameter of the closure element as an inner diameter. 
     
     
         14 . The device according to  claim 13 , wherein an expansion element is arranged within the second fluid connection. 
     
     
         15 . The device according to  claim 2 , wherein the at least one first sealing element and the at least one second sealing element are in each case formed as an O-ring seal. 
     
     
         16 . The device according to  claim 1 , wherein the first one of the fluid connections of the housing is formed to be acted upon with the fluid at a level of a counter pressure and the second one of the fluid connection of the housing is formed to be acted upon with the fluid at the level of the high pressure. 
     
     
         17 . The device according to  claim 1 , wherein a third one of the fluid connections of the housing is formed to be acted upon by the fluid at the level of the low pressure. 
     
     
         18 . The device according to  claim 17 , wherein a fourth one of the fluid connections of the housing is formed to be acted upon by a level of ambient pressure. 
     
     
         19 . The device according to  claim 1 , wherein the device is a scroll compressor having the housing with a counter wall and a compression mechanism with an immobile, fixed spiral and a movable, orbiting spiral driven via an eccentric drive, wherein the housing with the counter wall and the orbiting spiral are formed to enclose a counter pressure chamber at least in regions and a flow path extending from a region of the high pressure to the counter pressure chamber is formed within the housing, wherein the device is formed within the flow path extending between the region of the high pressure and the counter pressure chamber. 
     
     
         20 . The device according to  claim 19 , wherein the housing has at least two housing elements, wherein a first one of the housing elements is formed to receive the primary segment of the closure element of the device, and a second one of the housing elements is formed to receive the secondary segment of the closure element of the device. 
     
     
         21 . The device according to  claim 20 , wherein the closure element of the device is arranged within the receiving opening formed in the housing of the device, wherein the primary segment of the closure element is arranged within a first region of the receiving opening formed in the first one of the housing elements and the secondary segment of the closure element is arranged within a second region of the receiving opening formed in the second one of the housing elements. 
     
     
         22 . A use of the device according to  claim 19  in a refrigerant circuit of an air-conditioning system of a motor vehicle.