JPH03123997U

JPH03123997U -

Info

Publication number: JPH03123997U
Application number: JP3186790U
Authority: JP
Priority date: 1990-03-29
Filing date: 1990-03-29
Publication date: 1991-12-17

Description

[Brief explanation of drawings]

第１図はルーツポンプの側面断面図、第２図は
第１図の−線に沿つてみた断面図、第３図は
第２図の矢印に沿つてみた側面図、第４図は一
対のロータの回転に伴うルーツポンプの作動状態
の推移を示す側面断面図、第５図はロータ回転角
と第１室および第３室内の気体圧力との関係を示
す線図、第６図はロータ回転角と第２室、閉鎖空
間および第３室内の気体圧力との関係を示す線図
、第７図は遮蔽板を具えたロータの別の実施例を
示す正面図、第８図は第７図に示された遮蔽板を
具えたロータの側面図である。１……ハウジング、２……ロータ、３……ロー
タ、４……吸入口、５……吐出口、３１ｂ……閉
鎖空間。 Figure 1 is a side sectional view of the Roots pump, Figure 2 is a sectional view taken along the - line in Figure 1, Figure 3 is a side view taken along the arrow in Figure 2, and Figure 4 shows a pair of roots pumps. A side cross-sectional view showing the transition of the operating state of the Roots pump as the rotor rotates. Fig. 5 is a diagram showing the relationship between the rotor rotation angle and the gas pressure in the first and third chambers. Fig. 6 is a diagram showing the rotor rotation. A diagram showing the relationship between the corner and the gas pressure in the second chamber, the closed space, and the third chamber, FIG. 7 is a front view showing another embodiment of the rotor equipped with a shielding plate, and FIG. 8 is FIG. FIG. 3 is a side view of the rotor with the shielding plate shown in FIG. 1...Housing, 2...Rotor, 3...Rotor, 4...Suction port, 5...Discharge port, 31b...Closed space.

Claims

[Scope of utility model registration request]

A pair of biplane rotors that rotate while meshing with each other are arranged in the housing so that the gas sucked into the housing from an inlet formed in the peripheral wall of the housing is discharged from an outlet formed in the housing. In the Roots pump, the discharge port is formed on an axial end surface of the housing, and the opening and closing of the discharge port is controlled by the axial end surface of one rotor;
A roots pump in which a discharge port is opened into the closed space after the volume of the closed space formed by the housing peripheral wall and the pair of rotors located on the opposite side of the suction port is reduced.