Abstract: A double mechanical seal device, comprising a rotating ring, a first static ring, a second static ring, and a seal cover. A first bellows seal device is provided between the first static ring and the seal cover, and the first bellows seal device comprises a first bellows part capable of expanding and contracting in an axial direction, a first cover-side adapter, and a first static ring-side adapter. The first bellows seal device and the first static ring are disposed so that in a state where there is no pressure difference between the inside and outside of the first bellows part, a balance line of the first bellows part passes through a cross section of an O ring and a first static seal surface.

Abstract: A mechanical seal device includes a rotary ring 7 which is fixed to a rotary shaft 300, a fixed ring 4 which is slidably in contact with the rotary ring 7 and forms an annular seal surface S, a bellows 5 which supports the fixed ring 4 so as to bias the fixed ring 4 toward the rotary ring 7, a spring 6 which biases the fixed ring 4 toward the rotary ring 7, and a seal cover 2 which is attached to a housing 200, supports the bellows 5 such that an outer peripheral surface of the bellows 5 is on the inside A of the housing 200 relative to the seal surface S, and supports the spring 6 at a position located on the outside B of the housing 200 relative to the seal surface S and side by side with the bellows 5.

Abstract: A mechanical seal device includes a rotary ring 7 which is fixed to a rotary shaft 300, a fixed ring 4 which is slidably in contact with the rotary ring 7 and forms an annular seal surface S, a bellows 5 which supports the fixed ring 4 so as to bias the fixed ring 4 toward the rotary ring 7, a spring 6 which biases the fixed ring 4 toward the rotary ring 7, and a seal cover 2 which is attached to a housing 200, supports the bellows 5 such that an outer peripheral surface of the bellows 5 is on the inside A of the housing 200 relative to the seal surface S, and supports the spring 6 at a position located on the outside B of the housing 200 relative to the seal surface S and side by side with the bellows 5.

Abstract: A double mechanical seal device, comprising a rotating ring, a first static ring, a second static ring, and a seal cover. A first bellows seal device is provided between the first static ring and the seal cover, and the first bellows seal device comprises a first bellows part capable of expanding and contracting in an axial direction, a first cover-side adapter, and a first static ring-side adapter. The first bellows seal device and the first static ring are disposed so that in a state where there is no pressure difference between the inside and outside of the first bellows part, a balance line of the first bellows part passes through a cross section of an O ring and a first static seal surface.

Abstract: Provided is a small mechanical seal device which can efficiently wash a sealing surface, and can appropriately seal a sealed fluid and a quenching liquid. In a mechanical seal device (1), two sealing surfaces, i.e., an objective fluid sealing surface (131) and a quenching fluid sealing surface (132) are formed in a stationary sealing ring (130), and a quenching fluid passes through a sealing groove (133) provided between the sealing surfaces. Quenching bores (134) which penetrate through the stationary sealing ring (130) in the axial direction are formed in the stationary sealing ring (130). The quenching fluid passes between an intermediate chamber (C) provided on the back side of the stationary sealing ring (130) and the sealing groove (133) via the quenching bores (134).

Abstract: A mechanical seal device is provided for use when fluid pressure is frequently switched between positive and counter pressures. A rotary ring is provided on a rotary shaft and a stationary ring assembly is provided on which the stationary ring side sliding face is formed. A seal cover is provided containing the stationary ring assembly on an inner diameter side and supports the freely moving assembly in an axial direction of the rotary shaft along with a first O-ring to seal the first fluid and a second O-ring to seal the second fluid. A low-pressure chamber is sealed from the first fluid and the second fluid and maintains pressure lower than those of the first and the second fluids.

Abstract: Provided is a mechanical sealing device which is simply configured and wherein a rotation ring can be stably held in a specified axial position, and warping of the sealed surfaces can be prevented, thereby making it possible to obtain appropriate sealing characteristics. In a mechanical sealing device, a rotation ring is axially held between a rotation ring locking surface of a sleeve and a rotation ring locking surface of a collar. Furthermore, the sleeve, the rotation ring fixing collar, and the rotation ring are integrated together by means of a baffle knock pin for the rotation ring. Due to the above, whether positive pressure or negative pressure is applied, the rotation ring does not move, nor do the sealed surfaces of the rotation ring become warped. Moreover, assembly can be simply performed only by means of the knock pin.

Abstract: The present invention provides a cartridge type double seal having a size small enough to be mounted on the outer surface of an apparatus without using a space in a stuffing box and without requiring any special design and modification. In a seal device (1), a seal case (44) is fixed and installed by the set screw (18), screwed in radially inside from the far end of the mounting groove (15) of the seal cover (10) through the screw groove (17), at the innermost end of the seal cover (10). The thickness of thickness direction can be reduced because the seal case (44) is not axially supported and fixed.

Abstract: The object of the present invention is to provide a divisional type mechanical seal of outside type which joins the seal face in flat and strongly even in a seal ring having a different thickness in the radial direction, and to exhibit an appropriate sealing ability. In the mechanical seal device of the present invention, the circumference grooves 31 to 34 and 71 to 74 are formed in correspondence with the thicker area 38 and 78 and the thinner area 39 and 79 at the outer peripheral face of the seal ring 30, 70; and the circumference grooves 51 to 54 and 91 to 94 are formed in correspondence with the circumference direction grooves 31 to 34 and 71 to 74 at the inner peripheral face of the holder 50 and 90.

Abstract: In order to provide a mechanical seal device, which is suitably used even under a condition that fluid pressure is frequently switched between a positive pressure and a counter pressure, a mechanical seal device comprising; a rotary ring 137 provided on a rotary shaft 113 so as to integrally rotate with the rotary shaft, and on which rotary ring side sliding face 139 that constitutes one face of dynamic seal surface 173 is formed, a stationary ring assembly 52 on which stationary ring side sliding face 54 that slides with the rotary ring side sliding face and constitutes the other surface of the dynamic seal surface is formed, a seal cover 22 which contains the stationary ring assembly on inner diameter side and supports the stationary ring assembly to move freely in an axial direction of the rotary shaft, a first O-ring 92 which is sandwiched by the seal cover and the stationary ring assembly in a radial direction of the rotary shaft to seal the first fluid, and a second O-ring 96 which is provided closer to

Abstract: Provided is a small mechanical seal device which can efficiently wash a sealing surface, and can appropriately seal a sealed fluid and a quenching liquid. In a mechanical seal device (1), two sealing surfaces, i.e., an objective fluid sealing surface (131) and a quenching fluid sealing surface (132) are formed in a stationary sealing ring (130), and a quenching fluid passes through a sealing groove (133) provided between the sealing surfaces. Quenching bores (134) which penetrate through the stationary sealing ring (130) in the axial direction are formed in the stationary sealing ring (130). The quenching fluid passes between an intermediate chamber (C) provided on the back side of the stationary sealing ring (130) and the sealing groove (133) via the quenching bores (134).

Abstract: Provided is a mechanical sealing device which is simply configured and wherein a rotation ring can be stably held in a specified axial position, and warping of the sealed surfaces can be prevented, thereby making it possible to obtain appropriate sealing characteristics. In a mechanical sealing device, a rotation ring is axially held between a rotation ring locking surface of a sleeve and a rotation ring locking surface of a collar. Furthermore, the sleeve, the rotation ring fixing collar, and the rotation ring are integrated together by means of a baffle knock pin for the rotation ring. Due to the above, whether positive pressure or negative pressure is applied, the rotation ring does not move, nor do the sealed surfaces of the rotation ring become warped. Moreover, assembly can be simply performed only by means of the knock pin.

Abstract: The present invention provides a cartridge type double seal having a size small enough to be mounted on the outer surface of an apparatus without using a space in a stuffing box and without requiring any special design and modification. In a seal device (1), a seal case (44) is fixed and installed by the set screw (18), screwed in radially inside from the far end of the mounting groove (15) of the seal cover (10) through the screw groove (17), at the innermost end of the seal cover (10). The thickness of thickness direction can be reduced because the seal case (44) is not axially supported and fixed.

Abstract: The present invention provides a mechanical seal device, capable of sealing special fluid such as chemicals, easy to be mounted to a device and small in size. The mechanical seal device comprises a seal cover, a first seal ring axially-movably arranged in an inner circumference side of the seal cover, a second seal ring fixed to a rotary shaft, a spring arranged in the inner circumference side of the seal cover and pressing the first seal ring in a direction toward the second seal ring and a bellows mounted to the inner circumference side of the seal cover and axially-expandably mounted between the seal cover and the first seal ring. The spring is mounted to the seal cover along the axial direction in which the bellows is expanded and contracted.