JPH0227719Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a shaft sealing device for sealing the rotating shaft of a machine body, such as a pump for supplying raw materials such as pulp liquid, from the outside.

[Conventional technology]

Conventionally, in this type of shaft sealing device, especially in a stationary shaft sealing device, the periphery of the rotating shaft that protrudes to the outside of the machine body is sealed using a seal ring and a floating sheet that are built into the inner diameter of the flange of the seal case. However, there is a structure in which the floating sheet is pressed and biased in the axial direction by the biasing force of a spring.

[Problem that the invention attempts to solve]

However, in the case of a shaft seal device with such a conventional structure, it is not possible to adjust the spring load if liquid leakage increases during operation.
There was a problem in which it was necessary to temporarily stop operation, disassemble the machine, and replace the spring and assemble and adjust the internal mechanism.

[Purpose of invention]

This invention was made in view of the above-mentioned problems, and the object is to provide a shaft sealing device that can adjust the spring load during operation.

[Means for solving problems]

In order to solve the above problems, this invention
At the end of the spring that presses and biases the floating seat on the side opposite to the floating seat, there is an axially sliding member that is airtightly provided between the inner diameter part of the seal case and the outer diameter part of the rotating shaft via a packing and an O-ring. A movable spring restraining member is brought into contact with the spring restraining member, and the spring restraining member is configured to move forward and backward in the axial direction by engaging with an adjustment bolt screwed into the seal case.

[Effect]

That is, this invention has the above-mentioned structure,
By tightening or loosening the adjustment bolt, the spring restraining member moves in the axial direction, which changes the installation length of the spring, making it possible to adjust the spring load.Moreover, the spring restraining member Since it functions as a sealing means by being in close contact with the seal case and rotating shaft via the packing and O-ring, there is a space for draining and quenching between the seal ring and the shaft seal by the floating sheet. It is possible to do so.

〔Example〕

This invention will be explained below based on an illustrated embodiment.

The drawing shows a schematic configuration of the shaft sealing device according to this invention, and in the drawing 1 is a body, from which a rotating shaft 2 protrudes to the outside. A sleeve liner 3 is provided around the periphery of the rotating shaft 2.
is attached, and one end of the sleeve liner 3 is fixed to the rotating shaft 2 with a sleeve collar 4. Further, in the figure, reference numeral 5 denotes a seal case, which is attached to the body 1 through bolts 6 and nuts 7, and the sleeve liner 3 is attached to the inner diameter part 51 of the flange.
A seal ring 9 is fixed to the outer periphery of the flange portion 3a via an O-ring 8 made of FRM (metal-reinforced plastics), and a flow member is abutted against the seal ring 9 via a sliding contact member 10 made of silicon carbide (SiC). A floating sheet 11 is installed inside, and an FRM O-ring 12 is provided on the sliding surface of the floating sheet 11 and the flange inner diameter portion 51.
Further, reference numeral 13 in the figure represents a spring, and an insertion hole 53 is provided through the annular projection 52 of the flange inner diameter portion 51.
One end of the floating sheet is abutted against the floating sheet 11, while the other end is abutted against a ring-shaped spring restraining member 14 that is internally installed in the stepped annular portion 54 of the flange inner diameter portion 51, thereby causing the floating The seat 11 can be pressed against the seal ring 9 in the axial direction. The spring suppressing member 14 is attached to the rotating shaft 2.
The sleeve liner 3 is assembled to be slidable in the axial direction, and the inner diameter surface and the outer diameter surface of the sleeve liner 3, and the outer diameter surface and the stepped annular portion 54 of the flange inner diameter portion 51. A packing 15 and an O-ring 1 are attached to each sliding surface between the
6 is interposed to prevent leaked liquid from directly flowing outside. Reference numeral 17 in the figure is an adjustment bolt, and its stepped tip 17a is screwed into the annular protrusion 52 of the flange inner diameter portion 51 from the outside through the spring suppressing member 14, and the adjustment bolt 17 is tightened. By rotating the spring suppressing member 1 in the direction of loosening or loosening it,
4 in the axial direction, the mounting length of the spring 13 can be variably adjusted. In addition,
In the figure, reference numeral 18 denotes a flange inner diameter portion 5 in which the seal ring 9 and floating seat 11 are incorporated.
A water injection hole 19 injects water into the space 1, and a flange inner diameter portion 5 on which the floating sheet 11 slides.
This is a recovery hole for recovering liquid flowing into the space between the O-ring 12 of No. 1 and the annular protrusion 52.

The operation of the shaft sealing device configured as described above will be explained below. Since the spring suppressing member 14 can be moved in the axial direction by rotation of the adjustment bolt 17, the spring suppressing member The mounting length of the spring 13 can be changed by moving the spring 14, and the spring load can be adjusted. Therefore, if fluid leakage increases during operation, tighten the adjustment bolt 17 to increase the load on the spring 13. If so, it becomes possible to reduce liquid leakage. In addition, even if there is a lot of liquid leakage at the time of assembly, it is possible to adjust the leakage by adjusting the spring load, so there is no need to disassemble and adjust as in the past, and it can be easily adjusted during operation. It becomes possible to perform adjustment work. Furthermore, since a packing 15 and an O-ring 16 are interposed on the inner and outer diameter parts of the spring suppressing member 14, the liquid in the flange inner diameter part 51 of the seal case 4 does not directly flow out to the outside. , drainage collection and quenching can be performed effectively.

[Effect of idea]

As is clear from the above explanation, this idea is
By making the load of the spring that presses and biases the floating seat adjustable from the outside,
Since the spring load can be adjusted during operation, there is no need to stop the operation and disassemble and adjust as in the conventional case.Moreover, since the spring restraining member that supports the spring is provided with a sealing function, the spring restraining member and This has the advantage that drain collection and quenching can be performed between the seal ring and the shaft sealing portion using the floating sheet.

[Brief explanation of the drawing]

The drawing is a schematic cross-sectional view of essential parts showing an embodiment of the shaft sealing device according to the invention. DESCRIPTION OF SYMBOLS 1... Body, 2... Rotating shaft, 5... Seal case, 51... Flange inner diameter part, 9... Seal ring, 11... Floating seat, 13... Spring, 14... Spring suppressing member, 15 …
...Packskin, 16...O ring, 17...Adjustment bolt.

Claims (1)

[Scope of utility model registration request] The periphery of the rotating shaft protruding from the outside of the machine is sealed with a seal ring and floating seat built into the inner diameter of the flange of the seal case, and the floating seat is pushed against the seal ring by the biasing force of a spring. In the shaft sealing device, an airtight seal is provided between the inner diameter part of the seal case and the outer diameter part of the rotating shaft via a packing and an O-ring at the end of the spring on the side opposite to the floating seat. A shaft sealing device characterized in that an axially slidable spring suppressing member provided on the seal case is brought into contact with the spring suppressing member, and the spring suppressing member engages with an adjustment bolt screwed into the seal case to move forward and backward in the axial direction. .