초록 ▼

A primary technical goal of the present invention is to provide a mechanical seal device in which a manufacturing cost of the parts is decreased, a satisfactory seal performance is exhibited even under severe operating conditions, and the device can be easily mounted outside relative to the housing.

A primary technical goal of the present invention is to provide a mechanical seal device in which a manufacturing cost of the parts is decreased, a satisfactory seal performance is exhibited even under severe operating conditions, and the device can be easily mounted outside relative to the housing. The mechanical seal device comprises a first diaphragm, a stationary seal ring, a rotary seal ring, a second diaphragm and a fluid passage which guides a sealed process fluid to the respective pressure receiving grooves of the first diaphragm and the second diaphragm wherein the first diaphragm retains a fixing section which is fixed relative to the mounting portion of a seal cover, a retaining section and a first pressure receiving face, the stationary seal ring retains a seal face which is retained by the retaining section, the rotary seal ring retains an opposing seal face which stays in a sealing contact with the seal face, and the second diaphragm is shaped and dimensioned in more or less an identical manner relative to the first diaphragm and retains a retaining section, a fixing section and a second pressure receiving face thereon.

대표청구항 ▼

1. A mechanical seal device for providing a seal against a sealed process fluid, said mechanical seal device comprising:1) a seal cover being disposed at the end face of a housing and retaining a mounting face; 2) a first diaphragm being of an annular form and retaining a fixing section and a retain

1. A mechanical seal device for providing a seal against a sealed process fluid, said mechanical seal device comprising:1) a seal cover being disposed at the end face of a housing and retaining a mounting face; 2) a first diaphragm being of an annular form and retaining a fixing section and a retaining section, said fixing section being mounted on said mounting face of said seal cover, said retaining section being located on the other side relative to said fixing section; 3) a stationary seal ring being sealingly retained by said retaining section of said first diaphragm and having a seal face at one end; 4) a rotary seal ring having an opposing seal face, said opposing seal face being in a sealing contact relative to said seal face of said stationary seal ring; 5) a second diaphragm being of an annular form and being shaped and dimensioned in more or less an identical manner relative to said first diaphragm and retaining a retaining section and a fixing section, said fixing section being joined with a rotary shaft, 6) a first pressure receiving groove defined by said fixing section and said retaining section of said first diaphragm, and a clutch ring disposed between said first diaphragm and said rotary shaft, 7) a second pressure receiving groove defined by said fixing section and said retaining section of said second diaphragm, and a sleeve disposed between said second diaphragm and said rotary shaft, and 8) a fluid passage guiding said sealed process fluid into said first pressure receiving groove and said second pressure receiving groove. 2. A mechanical seal device as claimed in claim 1 wherein said fluid passage communicates a passage located within the inner diameter surfaces of said stationary seal ring and said rotary seal ring.3. A mechanical seal device as claimed in claim 1 wherein said stationary seal ring and said rotary seal ring are shaped in an annular form and divided along the axial direction, the division surfaces being fastened in an integral relation, and the retaining section of said first diaphragm to engage said stationary seal ring and the retaining section of said second diaphragm to engage said rotary seal ring are shaped in a cylindrical form.4. A mechanical seal device as claimed in claim 1 wherein a throttle valve is disposed in a upstream side of said fluid passage relative to said first diaphragm.5. A mechanical seal device as claimed in claim 1 wherein a sleeve is fittingly disposed between said fixing section of said second diaphragm and the rotary shaft.6. A mechanical seal device as claimed in claim 1, wherein the first pressure groove axially expands by guiding the sealed process fluid therein, and wherein the seal face of the stationary seal ring is pressed onto the opposing seal face of the rotary seal ring.7. A mechanical seal device as claimed in claim 1, wherein the second pressure groove axially expands by guiding the sealed process fluid therein, and wherein the opposing seal face of the rotary seal ring is pressed onto the seal face of the stationary seal ring.8. A mechanical seal device as claimed in claim 1, wherein the sealed process fluid acts on a pressure receiving area of the first and second pressure receiving grooves, wherein the first pressure groove axially expands by guiding the sealed process fluid therein, and wherein the seal face of the stationary seal ring is pressed onto the opposing seal face of the rotary seal ring, and wherein the second pressure groove axially expands by guiding the sealed process fluid therein, and wherein the opposing seal face of the rotary seal ring is pressed onto the seal face of the stationary seal ring.9. A mechanical seal device as claimed in claim 8, wherein the seal face of the stationary seal ring supported by the first diaphragm and the opposing seal face of the rotary seal ring supported by the second diaphragm press against each other with an equal amount of urging force while maintaining fluid tight sealing contact therebetween.