Coolant compressor

Abstract

The invention relates to a coolant compressor comprising an electric drive unit, a cylinder housing (1), a crankshaft (3) which can be driven by the electric drive unit, and a piston (2) that can be driven by the crankshaft (3) and is guided in a working volume of the cylinder housing (1) for cyclically compressing a coolant which can be conveyed via a suction valve into the working volume, said suction valve comprising a suction opening (7) and a valve closure element (8), preferably a valve spring, which closes the suction opening (7) in cycles. The aim of the invention is to ensure a continuous opening movement of the suction valve during the suction cycle. According to the invention, this is achieved by providing an actuation device (14; 15, 23) which is designed to open the valve closure element (8) in cycles.

Description

FIELD OF THE INVENTION[0001]The invention relates to a coolant compressor having an electrical drive unit, a cylinder housing, a crankshaft drivable by the electrical drive unit and a piston drivable by the crankshaft, guided in a working volume of the cylinder housing for cyclical compression of a coolant, which can be conveyed into the working volume via a suction valve comprising a suction opening and a valve-closing element, preferably a valve spring cyclically closing the suction opening.[0002]Generally, a cylinder head arrangement is mounted on the cylinder housing, the cylinder head arrangement comprising a suction opening and a valve-closing element that cyclically closes the suction opening. As a rule, the cylinder head arrangement also comprises a valve plate, which has the suction opening and a pressure opening, as well as a cylinder head cover, which forms a sealed cavity together with the valve plate. The valve-closing element of the suction valve is generally arranged ...

AI Technical Summary

Benefits of technology

The objective of this patent is to prevent the suction valve from hitting or bending during the suction cycle, which can cause air to flow through the valve incorrectly. This is accomplished through an actuating device that opens the valve actively instead of allowing it to open passively due to the vacuum in the cylinder. The design of the contact element and the connecting portion helps to keep the valve open without causing any flow losses during the coolant inflow. The orientation of the contact element also allows for direct use of the actuating device to continuously open the valve.

Problems solved by technology

A disadvantage of the prior art is that an undefined state arises during the opening movement of the suction valve: as soon as the opening force and the closing force are approximately equal, the suction valve opens and coolant flows into the cylinder.

This reduces the vacuum, however, and correspondingly also the opening force acting on the suction valve, so that the suction valve carries out a closing movement while it should actually be passing through the opening movement.

This firstly reduces the quantity of total coolant reaching the cylinder during the suction cycle, which results in reduced efficiency of the coolant compressor.

Secondly, the “fluttering” of the suction valve leads to a pulsation of the coolant in the coolant circuit, which results in an undesired increase of the noise level from the coolant compressor.

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