Proportional valve, air-conditioner compressor arrangement, and operating method

1. An electromagnetically actuatable differential pressure valve for use in CO 2 air conditioning compressor arrangements, comprising an electromagnetic actuator ( 3 ) for adjusting a valve body ( 2 ) relative to a valve seat ( 5 ), a first pressure connection ( 7 ) by which a fluid can flow bypassing the valve body ( 2 ) from the valve seat ( 5 ) to a second pressure connection ( 9 ), a diffuser chamber ( 30 ) which, with the valve body ( 2 ) lying against the valve seat ( 5 ), is connected in a fluid-conducting manner with the first pressure connection ( 7 ) by a fluid connection ( 22 ) defined by the valve body ( 2 ) and the valve seat ( 5 ), wherein the valve body ( 2 ) has a conical lateral surface ( 27 ), and wherein the valve seat ( 5 ) has an internal cone surface ( 28 ) which in sections encloses the valve body ( 2 ) radially on the outside, wherein the conical lateral surface ( 27 ) and the internal cone surface ( 28 ) together define the diffuser chamber ( 30 ), and wherein a cone angle of the conical lateral surface ( 27 ) is smaller, than a cone angle of the internal cone surface ( 28 ).

2. The proportional valve according to claim 1 , wherein the internal cone surface ( 28 ) is formed on an orifice component ( 21 ) forming the valve seat ( 5 ).

3. The proportional valve according to claim 1 , wherein the diffuser chamber ( 30 ), has an opening angle, defined as an angle bisetrix of the internal cone surface ( 28 ), from a value range between 10° and 35°, over a length between 0.5 mm and 10 mm.

4. The proportional valve according to claim 3 , wherein the opening angle is between 15° and 25° and the length is between 1 mm and 4 mm.

5. The proportional valve according to claim 1 , wherein the fluid connection ( 22 ) comprises a shaped recess ( 25 ) or a flat in/on the valve body ( 2 ) and/or a component forming the valve seat ( 5 ).

6. The proportional valve according to claim 5 , wherein the shaped recess is produced through material forming, or wherein the flat is produced by removing material, and/or wherein the component forming the valve seat ( 5 ) is an orifice component ( 21 ).

7. The proportional valve according to claim 1 , wherein for forming the fluid connection ( 22 ), a distance elevation ( 29 ) is provided.

8. The proportional valve according to claim 7 , wherein the distance elevation protrudes over a lateral surface of the valve body ( 2 ).

9. The proportional valve according to claim 1 , wherein a chamber ( 14 ) receiving an armature ( 15 ) of the electromagnetic actuator ( 3 ) and/or a force transmission plunger for adjusting the valve body ( 2 ) is connected in a fluid-conducting manner with a third pressure connection ( 10 ).

10. The proportional valve according to claim 9 , wherein the third pressure connection ( 10 ) is a suction pressure connection.

11. The proportional valve according to claim 1 , wherein the valve body ( 2 ) is adjustable onto the valve seat ( 5 ), by energising a coil arrangement ( 4 ) of the electromagnetic actuator ( 3 ).

12. The proportional valve according to claim 11 , wherein the valve body ( 2 ) is adjustable onto the valve seat ( 5 ) against a resetting force produced by a resetting spring.

13. An air conditioner compressor arrangement in a motor vehicle, with a proportional valve ( 1 ) designed as differential pressure valve according to claim 1 and an air conditioning compressor, wherein on the first pressure connection ( 7 ) a delivery pressure of the air conditioning compressor and on the second pressure connection ( 9 ) a crankshaft pressure (P C ) can be applied and/or is applied.

14. The air conditioning compressor arrangement according to claim 13 , wherein on a third pressure connection ( 10 ) of the proportional valve ( 1 ) which is connected with a chamber ( 14 ) receiving an armature ( 15 ) of the electromagnetic actuator ( 3 ) and/or a force transmission plunger for adjusting the valve body ( 2 ) in a fluid-conducting manner, a suction pressure (P S ) of the air conditioning compressor can be applied and/or is applied.

15. A method for operating an electromagnetically actuated proportional valve ( 1 ) according to claim 1 , wherein the diffuser chamber ( 30 ) with the valve body ( 2 ) lying against the valve seat ( 5 ) is supplied with fluid from the first pressure connection ( 7 ), which furthermore flows to the second pressure connection ( 9 ) and by flowing through the diffuser chamber ( 30 ) the fluid pressure force acting from the first fluid connection onto the valve body ( 2 ) is reduced.

16. The proportional valve according to claim 1 , wherein the valve body ( 2 ) is formed as a valve plunger.

17. The proportional valve according to claim 1 , wherein the cone angle of the conical lateral surface ( 27 ) is smaller by an angle from an angular range between 0.1° and 30°.