Electric control valve for a coolant compressor

Abstract

The present invention relates to an electric control valve which controls a coolant flow. The control valve includes a valve housing, which has connectors for a suction-pressure region, a high-pressure region and a crankcase-chamber-pressure region, a valve body, which is arranged to be displaceable between two positions, the valve body either mutually connecting or separating the high-pressure region and the crankcase-chamber-pressure region depending on the position, an electric actuating drive, which displaces the valve body, a means for determining the position of the valve body, a first pressure sensor, which determines a value of the suction pressure in the suction-pressure region, an electric control means, which, as a function of the determined value of the suction pressure, controls the coolant flow by displacing the valve body using the electric actuating drive, in such a way that if the determined suction pressure falls below a predetermined threshold the valve body connectsthe high-pressure region to the crankcase-chamber-pressure region, and an electric interface, by way of which the value determined by the first pressure sensor can be read off, and by way of which the control valve can be connected to a power supply.

Description

technical field [0001] The present invention relates to an electrically controlled valve for use in coolant compressors, in particular for use in coolant compressors for motor vehicles. An electrically controlled valve controls the flow of coolant from the high pressure area of ​​the coolant compressor into the crankcase-chamber-pressure area. Background technique [0002] Both the construction and the mode of operation of coolant compressors are known to the person skilled in the art, for example from DE 10 2011 117 354 A1. [0003] In the crankcase of the coolant compressor, a plurality of pistons are arranged to pump the coolant into the high pressure chamber. The movement of the pistons is guided by a rotating swash plate, as will become clear from the following description. [0004] If the swashplate, which is rotated eg by a belt drive, has a non-zero inclination angle, this results in an axial stroke movement of the piston during rotation of the swashplate about its...

AI Technical Summary

Problems solved by technology

[0021] However, this type of bellows is a mechanically operating part, which is sluggish due to construction and also undergoes an aging process

Thus, for example, the frequent unfolding of the bellows in the shape of an accordion and subsequent folding leads to fatigue of the material therein

Furthermore, in some cases it cannot be ensured that a bellows filled with a gas mixture will remain tight during its service life

Images