JPH02135687U

JPH02135687U -

Info

Publication number: JPH02135687U
Application number: JP4315089U
Authority: JP
Priority date: 1989-04-13
Filing date: 1989-04-13
Publication date: 1990-11-13

Description

[Brief explanation of drawings]

添付図面は本考案の実施例を示し、第１図は一
部切欠側面図、第２図は要部の拡大縦断側面図、
第３図は磁束保護シールの他の実施例の断面図で
ある。１……ルーツロータケーシング、２……ハウジ
ング、４……エンドカバー、６……駆動側軸、８
……従動マグネツト、９……従動ヨーク、１２…
…環部、１３……樹脂製キヤン、１４……外周ね
じ、１９……モータシヤフト、２０……駆動マグ
ネツト、２１……駆動ヨーク、２３……磁束保護
カバー、２４……通路、２５……磁束保護シール
。 The accompanying drawings show an embodiment of the present invention, with FIG. 1 being a partially cutaway side view, and FIG. 2 being an enlarged longitudinal sectional side view of the main part.
FIG. 3 is a sectional view of another embodiment of the magnetic flux protection seal. 1... Roots rotor casing, 2... Housing, 4... End cover, 6... Drive side shaft, 8
...Followed magnet, 9...Followed yoke, 12...
... Ring part, 13 ... Resin can, 14 ... Outer circumferential screw, 19 ... Motor shaft, 20 ... Drive magnet, 21 ... Drive yoke, 23 ... Magnetic flux protection cover, 24 ... Passage, 25 ... Magnetic flux protection seal.

Claims

[Scope of utility model registration request]

The drive side shaft of the Roots rotor protrudes from the end cover of the housing, and a driven yoke with a driven magnet is attached to the protrusion, and a ring-shaped part is provided on the end cover that protrudes concentrically with the drive side shaft. , A screw on the outer circumference of the base of a resin can with a body circumference of 5 m/m or less that covers the driven magnet is screwed and fixed to the inner periphery of the ring-shaped part, and a driving magnet corresponding to the driven magnet is connected through the can. A magnetic flux protection cover is firmly fitted to the motor shaft opposed to the end cover, and the drive magnet and the ring-shaped part correspond to each other at an interval of 10 m/m or more, and the magnetic flux protection cover and the drive are protruded from the end cover to the outer periphery of the drive yoke. A magnetic coupling type roots blower characterized in that a magnetic flux protection seal such as a labyrinth or a rubber ring is provided in the passage between the yoke and the outer periphery of the yoke to prevent the intrusion of magnetic dust adhering to the drive magnet.