Relief valve

Patent metadata

Field	Value
Publication number	US-9624822-B2
Application number	US-201214004015-A
Country	US
Kind code	B2
Filing date	Mar 8, 2012
Priority date	Mar 9, 2011
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A relief valve for turbines of exhaust turbochargers. Hot exhaust gas flows against this type of relief valves and the relief valves heat up significantly. Sensitive components such as the springs or the membrane can be damaged as a result. The relief valves are normally designed so that the membrane and a radiation panel are adjacent to a first chamber. Air is continuously guided through the first chamber in order to specifically cool the membrane and protect the membrane from excessive heating.

First claim

The invention claimed is:

1. A relief valve for exhaust gas turbochargers, comprising; a valve housing; a valve disk that cooperates with a valve seat; a valve stem guided in the valve housing, the valve stem having an overall length, a first end that extends at most to a midpoint of the overall length of the valve stem and a second end opposite the first end, the valve disk being at the second end of the valve stem, wherein a space is provided in the valve housing; a diaphragm arranged in the space and connected to the valve stem, wherein the diaphragm has an outer periphery connected to the valve housing with a sealing effect; a radiation shield plate located completely in the housing in the space on a side of the diaphragm facing the valve disk and a certain distance away from the diaphragm so as to extend around the first end of the valve stem, wherein the plate divides the space into two chambers, namely, a first chamber bounded by the diaphragm and the radiation shield plate, and a second chamber, bounded by the radiation shield plate and a wall of the valve housing, wherein, in an area of the chambers, the valve housing has an outer periphery with at least one air inlet for supplying air, wherein at least some of the air entering through the air inlet flows through the housing along the valve stem toward the valve disk, wherein the radiation shield plate has at least one opening allowing passage of the air, whereby air flows continuously through the first chamber formed by the diaphragm and the radiation shield plate, and wherein the air leaving the first chamber proceeds via a ring-shaped gap between the valve stem and the radiation shield plate.

2. The relief valve according to claim 1 , wherein the first chamber is provided with the air inlet.

3. The relief valve according to claim 1 , wherein the first chamber is provided with the air inlet, and at least some of the air flowing out of the first chamber flows into the second chamber.

4. The relief valve according to claim 1 , wherein the second chamber is provided with the air inlet, and the air flowing out of the second chamber flows into the first chamber.

5. The relief valve according to claim 4 , wherein the air inlet opens out into a ring-shaped channel in the valve housing, which channel is open to the second chamber.

6. The relief valve according to claim 1 , wherein the first chamber and the second chamber have the air inlet in common, and air flows continuously at least through the first chamber.

7. The relief valve according to claim 1 , wherein the radiation shield plate has an outer periphery connected with a sealing effect to the valve housing.

8. The relief valve according to claim 1 , wherein a ring-shaped gap is present between an outer periphery of the radiation shield plate and the valve housing.

9. The relief valve according to claim 1 , wherein several openings, which are distributed uniformly on a radius, are provided in the radiation shield plate.

10. The relief valve according to claim 1 , wherein several openings are provided in the radiation shield plate, the openings, to make air flow uniform, being arranged so that a cross-sectional area of the openings on a side facing the air inlet is smaller than a cross-sectional area of the openings on a side facing away from the air inlet.

11. The relief valve according to claim 9 , wherein the openings in the radiation shield plate are all of equal size.

12. The relief valve according to claim 9 , wherein the openings in the radiation shield plate are of different sizes.

13. The relief valve according to claim 10 , wherein the openings in the radiation shield plate are of different sizes.

14. The relief valve according to claim 9 , wherein the openings are arranged near an outer periphery of the radiation shield plate.

15. The relief valve according to claim 1 , wherein the radiation shield plate has a web that points toward the valve disk and rests against an opposite valve housing wall.

16. The relief valve according to claim 15 , wherein the web is formed as a pleat that extends around the valve stem in ring-like fashion and projects into and rests against a ring-shaped groove in the valve housing.

17. The relief valve according to claim 15 , wherein the web has a periphery with at least one opening.

18. The relief valve according to claim 15 , wherein the web has several openings uniformly distributed around a periphery of the web.

19. The relief valve according to claim 15 , wherein the web has a periphery with several openings that are at different distances from each other.

20. The relief valve according to claim 17 , wherein the openings in the web are all of equal size.

21. The relief valve according to claim 17 , wherein the openings in the web are of different sizes.

22. The relief valve according to claim 1 , wherein air leaving a gap between the housing and the valve stem flows into a hot-side space, which is bounded by a downstream valve housing wall and a hot-side radiation shield plate extending around the valve stem, wherein the hot-side radiation shield plate has an outer periphery connected with a sealing effect to the valve housing wall, wherein the hot-side radiation shield plate has air outlets in an area of the outer periphery of the hot-side radiation shield plate.

23. The relief valve according to claim 22 , wherein a ring-shaped gap, which represents another air outlet, is formed between the hot-side radiation shield plate and the valve stem.

Assignees

• Dobrowolski Michael
• Mtu Friedrichshafen Gmbh

Inventors

• Dobrowolski Michael

Classifications

• Y10T137/6579

  Circulating fluid in heat exchange relationship · CPC title

• F02B37/186

  Arrangements of actuators or linkage for bypass valves · CPC title

• F04D27/0215

  Arrangements therefor, e.g. bleed or by-pass valves · CPC title

• Y02T10/144

  Cross-Sectional Technologies · mapped topic

• F15B15/10

  the motor being of diaphragm type · CPC title