Coolant compressor

1. A coolant compressor ( 1 ), comprising a piston-cylinder unit ( 2 ) that compresses a coolant, said piston-cylinder unit comprising a cylinder housing ( 4 ) and a piston ( 3 ) held in a piston bore ( 5 ) of the cylinder housing ( 4 ), wherein the piston bore ( 5 ) is sealed in an axial direction by a valve plate ( 6 ) and a cylinder cover ( 7 ), and the valve plate ( 6 ) is countersunk in its operating position in the piston bore ( 5 ) of the cylinder housing ( 4 ) and is fastened in the piston bore ( 5 ) of the cylinder housing ( 4 ) by way of a material bond connection between the valve plate ( 6 ) and the piston bore ( 5 ), so that an end stop provided especially for the valve plate ( 6 ) in the cylinder housing ( 4 ) can be omitted.

2. The coolant compressor according to claim 1 , wherein the material bond connection is a welded joint.

3. The coolant compressor according to claim 1 , wherein the material bond connection is a soldered joint.

4. The coolant compressor according to claim 1 herein the material bond connection is a glued joint.

5. The coolant compressor according to claim 1 , wherein a gap ( 22 ) is designed between the outside circumference ( 15 b ) of the piston bore and an outside circumference ( 21 ) of the valve plate ( 6 ), in which it is possible to take up a binder layer ( 17 ) provided for formation of the material bond connection.

6. The coolant compressor according to claim 5 , wherein the gap ( 22 ) has a wedge-shaped course that tapers in the direction of the piston bore ( 5 ).

7. The coolant compressor according to claim 6 , wherein the wedge-shaped course of the gap ( 22 ) results from a chamfer ( 24 ) provided at the periphery ( 6 a ) of the valve plate ( 6 ).

8. The coolant compressor according to claim 1 , wherein a binder layer ( 17 ) provided for formation of the material bond connection runs along the entire circumference of the valve plate ( 6 ).

9. The coolant compressor according to claim 1 , wherein a binder layer ( 17 ) provided for formation of the material bond connection is arranged merely in sections along the circumference of the valve plate ( 6 ).

10. The coolant compressor according to claim 1 , wherein the valve plate ( 6 ) is designed as a single piece together with the cylinder cover ( 7 ).

11. A method for fastening a valve plate ( 6 ) at a cylinder housing ( 4 ) of a coolant compressor ( 1 ), comprising:

the cylinder housing ( 4 ) is provided with a piston bore ( 5 ) for the uptake of a piston ( 3 ) that oscillates therein, and wherein a distance between the face ( 27 ) of the piston ( 3 ) positioned at its top dead center and a first face ( 19 ) of the valve plate ( 6 ) facing the piston ( 3 ) is provided for the formation of a waste space volume, thus a space inside the cylinder housing ( 4 ) that does not belong to the working volume of the piston ( 3 ),

and wherein the valve plate ( 6 ) is pushed into the piston bore ( 5 ) in an axial direction ( 26 ), until a relevant defined distance or a desired waste space volume is created between the face ( 27 ) of the piston ( 3 ) positioned at its top dead center and the first face ( 19 ) of the valve plate ( 6 ) facing the piston ( 3 ), and the valve plate ( 6 ) is welded or soldered or glued on at this position in the piston bore ( 5 ) of the cylinder housing ( 4 ) between the valve plate ( 6 ) and the piston bore ( 5 ).