Thermally activatable pressure relief device
A thermally activatable pressure relief device includes a housing having an inlet passage and an outlet passage. A receiving cavity in the housing connects the inlet passage and the outlet passage. A blocking element provided in the receiving cavity. The blocking element is movable between a blocking position and a release position and blocking a fluid flow from the inlet passage to the outlet passage in the blocking position and is released in a release position. The pressure relief valve also includes and a support member, such as a bursting member, which holds the blocking element in the blocking position. The inlet passage opens transversely to the direction of movement of the blocking element in a side wall of the receiving cavity in the region of a mouth section which, in the blocking position, is filled by the blocking element.
1 . A thermally activatable pressure relief device, comprising:
a housing having opposed first and second ends along a longitudinal axis, at least one inlet passage and at least one outlet passage, wherein the outlet passage is disposed at the first end of the housing;
a receiving cavity in the housing, which connects the inlet passage and the outlet passage and in which a blocking element is received, the blocking element being movable along the longitudinal axis between a blocking position and a release position, wherein the blocking element blocks a fluid flow from the inlet passage to the outlet passage in the blocking position and releases the fluid flow in the release position;
an intermediate element disposed between the blocking element and the second end of the housing;
a support member disposed between the intermediate element and the second end of the housing, wherein the support member holds the blocking element in the blocking position, and wherein the inlet passage opens transversely to a direction of movement of the blocking element from the blocking position to the release position; and
a preloaded compression spring surrounding the intermediate element and configured to urge the blocking element in the direction of movement.
2 . The thermally activatable pressure relief device according to claim 1 , wherein the receiving cavity includes a first sealing ring and a second sealing ring, and wherein the sealing rings abut against an outer surface of the blocking element and an inner surface of the receiving cavity.
3 . The thermally activatable pressure relief device according to claim 2 , wherein the blocking element has a different diameter in a first region of the first sealing ring than in a second region of the second sealing ring.
4 . The thermally activatable pressure relief device according to claim 2 comprising a spacer sleeve disposed around the blocking element adjacent the first or second sealing ring.
5 . The thermally activatable pressure relief device according to claim 4 , wherein the spacer sleeve abuts the intermediate element.
6 . The thermally activatable pressure relief device according to claim 4 , wherein the spacer sleeve abuts a threaded sleeve into which the blocking element protrudes.
7 . The thermally activatable pressure relief device according to claim 1 , wherein the support member is a bursting member.
8 . The thermally activatable pressure relief device according to claim 1 wherein the receiving cavity is a first bore and the blocking element is a shut-off piston.
9 . The thermally activatable pressure relief device according to claim 8 , wherein the outlet passage is a second bore, and wherein the first and second bores are co-axial along the longitudinal axis.
10 . The thermally activatable pressure relief device according to claim 1 wherein the direction of movement of the blocking element is toward the second end.
11 . The thermally activatable pressure relief device according to claim 1 , wherein the spring is supported on the housing and on the intermediate element.
12 . The thermally activatable pressure relief device according to claim 1 , wherein the intermediate element directly contacts the support member.
13 . The thermally activatable pressure relief device according to claim 1 , wherein the intermediate element directly contacts the blocking element.
14 . The thermally activatable pressure relief device according to claim 1 , wherein the direction of movement of the blocking element is configured to push the intermediate element into a location of the support member.
15 . The thermally activatable pressure relief device according to claim 1 , comprising a plug configured to close the second end of the housing.
16 . The thermally activatable pressure relief device according to claim 1 , wherein the intermediate element comprises an opening into which the blocking element protrudes.
17 . The thermally activatable pressure relief device according to claim 1 , wherein the intermediate element and the blocking element are attached to each other so that they move together in the direction of movement.
18 . The thermally activatable pressure relief device according to claim 17 , wherein the intermediate element and the blocking element are attached to each other with an interference fit.
19 . The thermally activatable pressure relief device according to claim 17 , wherein the intermediate element and the blocking element are attached to each other with a threaded connection.