Abstract The invention relates to a mechanical seal device, especially for pumps, which seal is intended to prevent the pumped medium from passing into the pump motor. Such seals consist, among other things, of two seal rings, one stationary connected to the pump housing and one rotatable connected to the pump axis. The seal rings are pressed against each other by resilient means. Because of the friction between the two rings, there will be a generation of heat which is normally abducted by cooling oil or by the pumped medium. In case of break downs, for instance if the pumped medium disappears, the seal rings may be overheated. This is undesirable, especially in mine pumps where explosive gases may appear. According to the invention overheating is prevented by mounting a temperature-sensitive device, fuse metal, close to one of the seal rings. When the temperature has reached the critical value, the temperature-sensitive device will fuse, whereby the two seal rings are allowed to part and the generation heat ceases.
An improved mechanical seal device wherein there is provided a stationary seal ring and a rotatable seal ring which are pressed against each other by one or more resilient devices, wherein the improvement comprises: means coupled to one of the seal rings for holding the same in contact with the other seal ring during normal operation of the seal, said means being made of a fuse metal which fuses at a critical temperature above the temperature of normal operation of the seal for disengaging said stationary and rotatable seal rings at said critical temperature.
Claim 2
Dependent Claim
94 words
An improved mechanical seal device wherein there is provided a stationary seal ring and a rotatable seal ring which are pressed against each other by one or more resilient devices, wherein the improvement comprises: means coupled to one of the seal rings for holding the same in contact with the other seal ring during normal operation of the seal, said means being made of a fuse metal which fuses at a critical temperature above the temperature of normal operation of the seal for disengaging said stationary and rotatable seal rings at said critical temperature.
Claim 3
Dependent Claim
23 words
An improved mechanical seal device according to claim 1 wherein said means consists of a washer coupled to one of the seal rings.