JPS6137837Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for preventing gas leakage from a shaft seal when a turbomachine for a turbo compressor, blower, or fan is stopped.

Conventionally, an example of this type of device is shown in FIG. 2. In the same figure,
In order to press the O-ring C against the flange B provided on the shaft A, there is a drive gear D, a drive ring E, a seal ring F, a movable ring H built into the seal ring F, and a space between the movable ring H and the seal ring F. A spring or the like is provided.

In order to rotate the drive gear D, a drive device (not shown) is required.

This idea was made in view of the above situation, and its purpose was to create a device that can effectively prevent gas leakage when the compressor is stopped, without requiring a separate drive device like the conventional example above. It is to provide.

Another object of the present invention is to provide a device which can be operated without any trouble while recognizing its operating state.

This invention will be described with reference to drawings showing an embodiment. In FIG. 1, a support part 2 of a seal box 6 provided in a casing 1; a seal box 6 forming a first passage 8 communicating with the working chamber 16; a piston 1 having O-rings 5, 12 on the sliding portion slidably fitted into the working chamber 16;
0; two O-rings 11 and 11' provided at the outer ends of the piston 10 in the axial direction; a spring 4 provided in the support portion 2 that urges the piston 10 inwardly into the working chamber 16; a shaft 17 having a flange 3 that contacts the piston 10 via the O-rings 11 and 11'; a position detection section 7 that detects the position of the piston 10 provided in a part of the outside of the seal box 6; a pin 14 that is provided in a part of the piston 10 and moves with the movement of the piston 10 to indicate the position of the piston 10 to the position detection section 7; the working chamber 16 of the piston 10;
A blind hole formed in a part of the surface facing the working chamber 16 of the seal box 6 and at a position corresponding to the blind hole;
Anti-rotation pin 9 inserted so as to be inserted deep and shallow;
This gas leakage prevention device when the compressor is stopped is characterized by comprising a second passage 21 formed in the piston 10, which communicates between the piston 1 and the working chamber 16.

In the drawing, reference numeral 15 denotes an inclined portion, 13 denotes a rotating member, 18 denotes the inside of the compressor, 19 denotes the outside thereof, and 20 denotes a gas chamber.

To describe the operation of this device, in FIG.
When the piston 10 is press-fitted into the spring 4, the piston 10 moves in the direction of the spring 4, and the O-ring 1 of the piston
1 and 11' are pressed against the flange 3. Then, the gas chamber 20 is filled with gas, and the pressure in the chamber 20 is increased. In this state, the gas inside the compressor 18 does not leak to the outside 19 of the compressor.

Next, the supply of the working gas is stopped, and the working chamber 16
If the working gas in the piston 10 is released, the spring 4
The O-rings 11, 11' are separated from the flange 3, and the shaft 17 rotates freely.
The compressor can now be operated. When the piston 10 moves, the pin 14 moves accordingly, and the position of the piston is displayed on the position detecting section 7.

Next, on the inner surface of the working chamber 6, a rotation prevention pin 9 is provided at a position corresponding to the blind hole formed in the piston 10, and since it is inserted into the blind hole, the piston 10 is is regulated so that it does not rotate at all times during movement.

Since this invention is configured as described above, there is no need to use a separate drive device as shown in the conventional example.

Further, as another effect, by providing the position detecting section 7 for detecting the position of the piston 10, the position of the piston 10 can be known, and thereby the operating state of the piston 10 can be known. In addition, as another effect, the seal box 6 facing the working chamber 16
Establish an anti-rotation pin 9 on the piston 1 and connect it to the piston 1.
By inserting the piston 10 into the blind hole formed at 0, the piston 10 can be prevented from rotating, and the operation of the position detecting section 7 for detecting the position of the piston 10 can be prevented from being hindered.

Another effect is that the gas chamber 20 is formed between the O-rings 11 and 11' by communicating with the working chamber 16 through the second passage 21, so that the pressure in this area can be increased, which is effective. A gas seal can be performed.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of this invention, including a partial sectional view of the gas leakage prevention device when the compressor is stopped,
The figure is a partial sectional view of a conventional similar device. DESCRIPTION OF SYMBOLS 1... Casing, 2... Support part, 3... Flam part, 5... O-ring, 6... Seal box, 7
...Position detection unit, 8...First passage, 9...Rotation prevention pin, 10...Piston, 11...O ring,
11'...O-ring, 14...pin, 16...working chamber, 17...shaft, 21...second passage.

Claims (1)

[Scope of utility model registration request] Seal box 6 provided in casing 1
Support part 2; Working chamber 16 provided in the support part 2
and a first passage 8 communicating with the working chamber 16.
a seal box 6 formed with a seal box 6; a piston 10 that is slidably fitted into the working chamber 16 and has O-rings 5, 12 on the sliding part; the piston 10;
Two O-rings 1 provided at the outer ends in the axial direction of
1, 11'; a spring 4 that urges the piston 10 provided on the support portion 2 inwardly into the working chamber 16;
A shuffle 17 having a flange 3 that contacts the piston 10 via the O-rings 11, 11'; a position detection section 7 that detects the position of the piston 10 provided in a part of the outside of the seal box 6; a position detection section 7 for detecting the position of the piston 10; The piston 10 is provided in a part of the piston 10.
a pin 14 that moves with the movement of the piston 10 and indicates the position of the piston 10 to the position detection section 7; a blind hole formed in a part of the surface of the piston 10 facing the working chamber 16; an anti-rotation pin 9 erected on the surface facing the working chamber 16 and at a position corresponding to the blind hole, and inserted into the blind hole so as to be freely insertable in depth and shallowness; on the outer shaft end surface of the piston 10; The piston 1 communicates between the O-ring 11 and 11' and the working chamber 16.
1. A gas leakage prevention device when a compressor is stopped, characterized in that the second passage 21 is formed at 0.0 mm.