Pressure Release Device

• US 20190321667A1
• Filed: 06/21/2017
• Published: 10/24/2019
• Est. Priority Date: 06/29/2016
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Inventors: Ott, Toni Christian, Naumann, Reiner, Herbod, Dominik
• Granted Patent: US 11,420,082 B2
• Time in Patent Office: Days
• CPC Class Codes: A62C 3/16 in electrical installations, e.g. cableways
• CPC Class Codes: A62C 4/00 Flame traps allowing passage of gas but not of flame or explosion wave
• CPC Class Codes: G01L 19/0663 Flame protection; Flame barriers
• CPC Class Codes: H02G 3/0412 Heat or fire protective means for fire in electric circuits A62C3/16

Abstract

The invention relates to a pressure relief device (1) for a housing (2) which is protected against explosions, in particular is compression-proof and has a wall connecting piece (3) which can be at least partially inserted into a housing opening (4) of a housing wall (6) by its insertion connecting piece section (5), which can be in particular detachably fixed from an inner side of the housing and rests from the outside on an opening edge (8) of the housing opening (4) in its inserted and fixed position with a radially outwardly projecting support flange (7), wherein the insertion connecting piece section (5) furthermore comprises a projecting connecting piece section (9) which is opposite the insertion connecting piece section relative to the support flange (7) and comprises a longitudinal conduit (10) running through the wall connecting piece (3) into which conduit a flame-blocking body (11) is replaceably inserted, wherein a pressure nut (13) which loads the flame blocking body (11) with pressure in its insertion position and with a pressure edge (14) projecting radially inward at least in sections can be screwed onto a free end section (12) of the projecting connecting piece section (9), and wherein the pressure edge (14) contacts an outer viewing side of the flame blocking body (11).

Claims

1. A pressure relief device for a housing comprising:

a wall connecting piece including an insertion connecting piece configured to be at least partially inserted into a housing opening of a housing wall of the housing and configured to be detachably fixed to the housing, the wall connecting piece including a support flange projecting radially outward from the insertion connecting piece and configured to rest on the outside of an opening edge of the housing opening when the insertion connecting piece is inserted and fixed to the housing, the wall connecting piece including a projecting connecting piece section opposite the insertion connecting piece section relative to the support flange, the projecting connecting piece section defining at least a portion of a longitudinal conduit running through the wall connecting piece;

a flame-blocking body replaceably inserted into the longitudinal conduit; and

a pressure nut which secures the flame-blocking body in the longitudinal conduit in an insertion position, the pressure nut configured to be threadably connected to a free end section of the projecting connecting piece section, the pressure nut including a pressure edge projecting radially inward that loads the flame blocking body with pressure in the insertion position, the pressure edge configured to contact an outer viewing side of the flame blocking body.

2. The pressure relief device according to claim 1, wherein the longitudinal conduit includes a radially inwardly projecting support step for fixing the insertion position of the flame blocking body, wherein the pressure relief device further comprises a spacer ring arranged between the support step and the flame blocking body.

3. The pressure relief device according to claim 1, wherein the projecting connecting piece section includes an outer thread which fits an inner thread of the pressure nut.

4. The pressure relief device according to claim 1, wherein the pressure edge is disposed on an outer free end of the pressure nut, the pressure edge having an outer side that is shaped as a screw-in polygon, the pressure edge including a pressure projection on a lower side of the pressure edge that engages the flame blocking body.

5. The pressure relief device according to claim 1, further comprising a tight-fit screw that can be screwed laterally into the pressure nut to secure the pressure nut to the projecting connecting piece section.

6. The pressure relief device according to claim 1, wherein the flame blocking body is a sintered body and has a flat upper side and a lower side with a flat edge area between the flat upper side and lower side, the flat upper side defining the outer viewing side.

7. The pressure relief device according to claim 2, wherein the spacer ring is formed by a flame-protected or fire-proof material.

8. The pressure relief device according to claim 1, wherein the insertion connecting piece section has a thread relief groove on an end section of the insertion connecting piece section bordering the support flange.

9. The pressure relief device according to claim 1, wherein the flame blocking body is inserted without an ignition gap into the longitudinal conduit.

10. The pressure relief device according to claim 1, further comprising an intermediate connecting piece arranged between the pressure nut and substantially the support surface, the intermediate connecting piece including a connection piece end section configured to be threadably connected to the projecting connection piece section and a nut end section configured to be threadably connected to the pressure nut, wherein the intermediate connecting piece includes a pressure step which projects radially inward and loads the flame blocking body with pressure in the direction of the support step.

11. The pressure relief device according to claim 10, wherein the pressure step is arranged on a lower end of the nut end section.

12. The pressure relief device according to claim 11, wherein the nut end section includes a radially inwardly projecting annular step having an outside diameter that is substantially equal to an outside diameter of the support step.

13. The pressure relief device according to claim 12, wherein a sprayed water body is arranged on the annular step and loaded with pressure by the pressure edge of the pressure nut in the direction of the annular step, wherein the sprayed water body for protection against sprayed water is a sintered body.

14. The pressure relief device according to claim 13, wherein the sprayed water body for protection against sprayed water and the flame blocking body are produced from the same material.

15. The pressure relief device according to claim 14, wherein the sprayed water body for protection against sprayed water has a higher density than the flame blocking body.

16. The pressure relief device according to claim 15, wherein the sprayed water body for protection against sprayed water includes at least one drainage opening, wherein each drainage opening is a radially outwardly open edge groove.

17. The pressure relief device according to claim 16, wherein the annular step includes a bunghole connecting the longitudinal conduit and each drainage opening, wherein the sprayed water body for protection against sprayed water and the flame blocking body are arranged at a distance from one another in the longitudinal conduit.

18. The pressure relief device according to claim 17, further comprising a moisture protection membrane replaceably arranged between the sprayed water body for protection against sprayed water and the flame blocking body.

19. The pressure relief device according to claim 10, further comprising a tight-fit screw that can be screwed into the intermediate connecting piece to secure the intermediate connecting piece to the projecting connecting piece section, wherein the intermediate connecting piece includes a radially outwardly projecting screw-in polygon.

20. The pressure relief device according to claim 13, wherein the sprayed water body for protection against sprayed water and the flame blocking body are elastic under pressure and include a pore closure on the outer edge side.