JPH0217249Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a mechanical seal related to shaft sealing technology, in which flushing is provided to prevent slurry from accumulating in the sliding part and to cool the sliding material. Regarding improvements to the mechanism.

[Conventional technology]

Conventionally, as an example of the above-mentioned flushing mechanism, a second
There is something like the one shown in the figure.

That is, in the figure, the mechanical seal, which is designated as a whole by reference numeral 1, includes a fixed sliding ring 2 that is airtightly supported and fixed to the inner periphery of the device housing 5 via a metal retainer 4, and a mechanical seal that is airtightly supported and fixed to the outer periphery of the shaft 6. The retainer 4 is comprised of a rotary sliding ring 3 that is supported and appropriately biased with elasticity by a spring member (not shown) and closely slides on the fixed sliding ring 2. A through hole 7 is drilled which connects to the inner circumferential space 9 of the housing 5 and whose outer diameter side opening 7b connects to the flushing hole 8 provided in the housing 5, so that the flushing hole 8,
By injecting a low temperature and clean liquid (flushing liquid) into the inner circumferential space 9 through the through hole 7, cooling of the mechanical seal sliding part 10 and prevention of slurry retention are achieved.

[Problem that the invention attempts to solve]

However, the conventional flushing mechanism described above has a structure in which the flushing liquid is introduced by drilling a through hole 7 through the inner and outer periphery of the retainer 4.
Not only does the number of man-hours required to process the retainer 4 increase, making it expensive, but also the distance between the opening 7a (discharge port) of the through hole 7 and the sliding part 10 is large, so cooling and slurry with the flushing liquid in the sliding part 10 is required. There was a problem that the removal action was not sufficient.

[Means for solving problems]

In view of the above, the present invention has been made with the purpose of providing a flushing mechanism for a mechanical seal that can sufficiently cool and remove slurry. A required number of grooves are carved on the rear back surface of the ring, extending to connect the outer peripheral edge and the inner peripheral edge, and engaging in the circumferential direction with a detent pin implanted in the front surface of the rear member, and the grooves and the rear A flow path surrounded by the front surface of the member is communicated with a flushing hole provided in the device housing.

[Effect]

In the configuration of the present invention, the so-called flushing liquid from the flushing hole engages with a rotation prevention pin implanted on the front surface of a rear member such as a retainer to prevent rotation. Since it is introduced into the mechanical seal sliding part side using the groove, the fixed sliding ring is directly cooled while flowing through the flow path formed by being surrounded by the groove and the front surface of the rear member. Since the flushing liquid outlet of the groove is close to the sliding part, cooling and slurry removal of the sliding part by the flushing liquid can be performed efficiently.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIG. 1. A mechanical seal, generally designated by reference numeral 11, is airtightly attached to the inner periphery of a device housing 16 via a metal retainer 14 and an O-ring 15. A non-rotating fixed sliding ring 12 is supported on the shaft 17, and the fixed sliding ring 12 is airtightly supported on the outer periphery of a shaft 17 and rotates together with the shaft 17. It is composed of a rotating sliding ring 13 that slides closely under surface pressure. The rear surface 18 of the fixed sliding ring 12 has an outer peripheral edge 1
The retainer 1 extends from 9a to the inner peripheral edge 19b.
A plurality of grooves 20 (only one is shown in the figure) are carved to engage in the circumferential direction with a locking pin 27 implanted in the front surface 21 of the 4, and the grooves 20 and the grooves 20 that engage in the circumferential direction A flow path 22 is defined by the front surface 21 of the retainer 14 in contact with the retainer 14 . The flow path 22 communicates with a flushing hole 25 of the housing 16 via a through hole 24 bored in a fitting portion 23 with the housing 16 on the outer diameter side of the retainer 14 .

In the above structure, the retainer 14 does not have a through hole penetrating the inner or outer periphery, and is therefore smaller in the axial direction than the conventional one. In order to form a liquid flow path 22, its discharge port 22' is relatively close to the mechanical seal sliding portion 26.

[Effect of idea]

As described above, according to the present invention, when the flushing liquid introduced from the flushing hole of the housing flows through the channel in the groove on the rear surface of the fixed sliding ring, the sliding ring is immediately cooled, and The flushing liquid discharged from the flow path can sufficiently reach the vicinity of the sliding part of the mechanical seal to efficiently cool the part and remove slurry. Because it utilizes the engagement groove on the back of the fixed sliding ring that engages with the anti-rotation pin planted on the front, it has an excellent effect in that there is no need to provide a separate hole for the flow path. play.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view showing an embodiment of the present invention;
FIG. 2 is a half-cut sectional view showing an example of a conventional structure. 11... Mechanical seal, 12... Fixed sliding ring, 13... Rotating sliding ring, 14... Retainer, 1
6...Housing, 17...Shaft, 18...
Back surface, 19a...outer periphery, 19b...inner periphery,
20... Groove, 22... Channel, 25... Flushing hole.

Claims (1)

[Scope of utility model registration request] The required number of pins that extend on the rear back surface of a fixed sliding ring supported by a rear member such as a retainer so as to connect the outer peripheral edge and the inner peripheral edge, and engage in the circumferential direction with detent pins implanted in the front surface of the rear member. A flushing mechanism for a mechanical seal, characterized in that a groove is carved therein, and a flow path formed between the groove and the front surface of the rear member is communicated with a flushing hole provided in a device housing.