JPS6136846Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention This invention relates to a duct switching device that has excellent sealing properties, without damage to seals due to the heat of the fluid passing through the duct, or malfunctions due to dust clogging, etc. when switching ducts. It is something.

BACKGROUND ART Conventionally, when switching from one duct to another, a three-way valve as shown in FIGS. 1 and 2 has been used. That is, duct 2 and duct 3 are branched from duct 1, and ball valve body 5 is formed around axis 4.
The duct was switched by rotating the .
However, with this method, the seal portion 6 may be damaged by the heat of the fluid passing through the ducts 1, 2, and 3, and dust contained in the gas passing through the duct may be deposited between the ball valve element 5 and the body 7 or the ball. There are disadvantages in that jamming occurs between the valve body 5 and the seal portion 6, resulting in malfunction, and the valve body 5 is worn out due to this jamming, resulting in extremely poor sealing performance. Ta.

Composition of the invention The present invention was developed in view of the above-mentioned drawbacks, and its gist is that a swivel joint is connected to one end, and a telescopic pipe and a telescopic device for the telescopic pipe are installed at the other end. a duct, a sealing material provided between the joint surface flange of the expandable pipe and the joint surface flange of the mating duct, a bearing support portion that supports the bent duct rotatably around the axis of the swivel joint; A duct switching device characterized by comprising a turning device for the bent duct.

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 3 is a diagram showing the case where the duct 8 is switched and connected to the duct 9 or 9'.

The duct 8 is connected to a vacuum exhaust device, a dust collector, etc. (not shown). Then, the equipment connected to the duct 9 or 9' is evacuated, dust collected, etc. 10 is a curved duct, and this curved duct 10 has a swivel joint 11
The duct 10 is connected to the duct 8 so as to be rotatable around the axis of the duct, and is connected to the duct 10 by a seal packing in a swivel joint 11, which will be described later.
The inside and outside are sealed.

The swivel joint 11 is a type of joint for duct piping, and is intended to be rotatable around the axis of the duct/piping, and to seal the inside and outside of the duct/piping. Reference numeral 12 denotes an extensible tube, which is expanded and contracted by an extensible device 13. The extensible portion of the extensible tube 12 has a bellows structure that can withstand pressure and sufficiently cope with thermal expansion and expansion/contraction operations. The telescopic pipe 12 and the duct 9 or 9' are sealed by a sealing material such as an O-ring 14 provided on the flange 28 of the duct, as shown in FIG. Support bracket 1 for bent duct 10
5, a rotation shaft 16 is connected to the axis of the swivel joint 11, and the curved duct 10
The load applied to is supported by the pedestal 18 via the rotation shaft 16 and the bearing 17. The bearing 17 supports thrust loads and radial loads. Rotation axis 16
is the electric motor 2 via the coupling 19 reducer 20.
A swing device 29 driven by 1 is attached. An example of the structure of the swivel joint 11 is shown in FIG. The duct 8 is connected to the housing 2
A housing 23 connected to the bent duct 10
A ball 24 installed between the housings 22 and 23 allows relative rotation between the housings 22 and 23. 25
and 26 are seal packings. Also ball 2
A roller may be used instead of 4.

Effect of the invention Next, the means for switching ducts using this device is as shown below.

In FIG. 5, when switching the duct 8 from the duct 9 to the duct 9', the telescoping device 13 of the telescoping pipe 12 is first contracted to contract the telescoping pipe 12. Next, the curved duct 10 is rotated toward the duct 9' by the electric motor 20 for rotation driving. After that, the expansion device 1
3, by extending the telescopic tube 12, the telescopic tube 12 and the duct 9' are brought into contact. Thereby, the duct 8 is airtightly connected to the duct 9'.

In addition to the O-ring 14 shown in FIG. 6, other sealing materials may be used as the sealing material, such as a square packing 27 as shown in FIG. 7 or a sheet packing (not shown). The bending angle of the bent duct 10 of the present invention is not limited to 90 degrees as shown in FIG. 3, but may be other angles as shown in FIGS. 8 and 9, for example.

Effects of the invention According to the invention, the seal between the telescopic pipe 12 and the duct 9 or 9' is achieved by the O-ring 14 provided on the flange 28, and the telescopic cylinder 13 of the telescopic pipe 12 seals the flange 28 of the telescopic pipe 12 and the duct 9. Alternatively, the flanges 28 of 9' can be crimped to eliminate the gap between these flanges 28, so the O-ring 14 is not directly exposed to the passing fluid, and the sealing material is not exposed to the dust contained in the passing fluid. There is no damage and therefore more airtightness than before is maintained.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of the conventional method, FIG. 3 is a front view of the device according to the present invention, FIG. 4 is an explanatory diagram of the swivel joint portion of the present device, and FIG. 5 is an explanatory diagram of the device according to the present invention. The plan view is an explanatory diagram of the operation, FIGS. 6 and 7 are explanatory diagrams of the sealing material of the connection flange, and FIGS. 8 and 9 are explanatory diagrams when the bending angle of the bent duct is other than 90 degrees. 1, 2, 3: duct, 4: shaft center, 5: ball valve body, 6: seal part, 7: body, 8, 9: duct, 10: bent duct, 11: swivel joint, 12: telescopic pipe, 13: Telescopic device, 14: O-ring, 15: Support bracket, 16: Rotating shaft, 1
7: Bearing, 18: Frame, 19: Coupling, 2
0: Reducer, 21: Electric motor, 22, 23: Housing, 24: Ball, 25, 26: Seal packing, 27: Square packing, 28: Flange, 29:
Swivel device.

Claims (1)

[Scope of utility model registration request] A bent duct with a swivel joint connected to one end and a telescoping pipe and an expansion device for the telescoping pipe installed at the other end, and a joint flange of the telescoping pipe and a joint flange of the other duct. sealing material and
A duct switching device comprising: a bearing support that rotatably supports the curved duct around the axis of the swivel joint; and a rotating device for the curved duct.