Abstract: Included are: a case; a motor provided in the case and having a rotatable shaft; two blowers provided in the case and including impellers that are fixed to a shaft and are capable of being rotated by the motor, the impellers each having multiple blades disposed at predetermined intervals on a circumference of the corresponding impeller; an intake port provided in the case and configured to take air in between the two blowers; and discharge ports provided in the case to each correspond to a one of the two blowers, each configured to discharge the air taken into a corresponding blower through the intake port to the outside. In each of portions that accommodates corresponding one of the two blowers in the case, a side opposite to a side through which air is taken in is sealed off so as to prevent inflow of air.

Abstract: A vane pump 1 has a pump chamber 2A through an axial direction oil supply hole 11a, a diameter direction oil supply hole 11b, and an axial direction oil supply groove 11c of an oil supply passage 11. A gas passage 13 contains a gas groove 13a whose one end is made to communicate with an outer space, the gas groove 13a being formed on an outer peripheral surface of a shaft part 3B of a rotor 3, and the other end of this gas groove is made to intermittently overlappingly communicate with the axial direction oil supply groove 11c by a rotation of the rotor.

Abstract: A vane pump in which a lubricating oil from an oil supply pipe 12 is supplied to a pump chamber 2A through an axial direction oil supply hole 11a of an oil supply passage 11, a diameter direction oil supply hole 11b, and an axial direction oil supply groove 11c. A gas passage 13 includes a diameter direction gas hole 13a and an axial direction gas groove 13b, and the diameter direction gas hole 13a is made to communicate with the axial direction gas groove 13b when the diameter direction oil supply hole 11b is made to communicate with the axial direction oil supply groove 11c.

Abstract: An oil supply groove in communication with a pump room is formed above a bearing of a housing, and an open air groove in communication with atmospheric air is formed at a position rotated around the bearing by 90° from the oil supply groove. In a shank of a rotor, a branch passage branching from an oil passage formed in its axial direction to the diametrical direction of the shank and an open air passage formed in the direction perpendicular to the branch passage are formed. The branch passage and the oil supply groove communicate with each other while the open air passage and the open air groove are arranged to also communicate with each other.

Abstract: A vane type vacuum pump 1 is provided in the vicinity of an air intake passage 11 for sucking the air into a pump chamber 2, and communicates a space A on the front side and a space B on the back side of the rotational direction of the vane at the time of the reverse rotation of the vane 6, and includes an escaping groove 21 for allowing a lubricating oil to escape into the space B on the back side from the space A on the front side.

Abstract: A lubricating oil from an oil supply pipe 12 is supplied to a pump chamber 2A through an axial direction oil supply hole 11a of an oil supply passage 11, a diameter direction oil supply hole 11b, and an axial direction oil supply groove 11c. A gas passage 13 includes a diameter direction gas hole 13a and an axial direction gas groove 13b, and the diameter direction gas hole 13a is made to communicate with the axial direction gas groove 13b when the diameter direction oil supply hole 11b is made to communicate with the axial direction oil supply groove 11c.

Abstract: A lubricating oil to be supplied to a vane pump 1 is supplied to a pump chamber 2A through an axial direction oil supply hole 11a, a diameter direction oil supply hole 11b, and an axial direction oil supply groove 11c of an oil supply passage 11. A gas passage 13 is comprised of a gas groove 13a whose one end is made to communicate with an outer space, the gas groove 13a being formed on an outer peripheral surface of a shaft part 3B of a rotor 3, and the other end of this gas groove is made to intermittently overlappingly communicate with the axial direction oil supply groove 11c by a rotation of the rotor. Clogging does not easily occur as compared with a case where the gas passage 13 is comprised of a through-hole as a conventional apparatus since the gas passage is comprised of the groove-shaped gas groove 13a, thus enabling to reduce a passage area of the gas passage.

Abstract: An oil supply groove 12 in communication with a pump room 2A is formed above a bearing 2B of a housing 2, and an open air groove 14 in communication with an atmospheric air is formed at a position rotated around the bearing 2B by 90° from the oil supply groove. In a shank 3B of a rotor 3, a branch passage 11a branching from an oil passage 11 formed in its axial direction to the diametrical direction of the shank and an open air passage 13 formed in the direction perpendicular to the branch passage are formed. The branch passage and the oil supply groove communicate with each other while the open air passage and the open air groove are arranged to also communicate with each other. When the oil passage and the oil supply groove communicate with each other as the rotor stops, atmospheric air flowing in from the open air passage eliminates a negative pressure in the pump room to prevent the lubricating oil from flowing into the pump room in large quantities.

Abstract: An oil supply groove 12 in communication with a pump room 2A is formed above a bearing 2B of a housing 2, and an open air groove 14 in communication with an atmospheric air is formed at a position rotated around the bearing 2B by 90° from the oil supply groove. In a shank 3B of a rotor 3, a branch passage 11a branching from an oil passage 11 formed in its axial direction to the diametrical direction of the shank, and an open air passage 13 formed in the direction perpendicular to the branch passage are formed. Then, the branch passage and the oil supply groove communicate with each other, at the same time, the open air passage and the open air groove are arranged to also communicate with each other, and when the oil passage and the oil supply groove communicate with each other as the rotor stops, then an atmospheric air flowing in from the open air passage eliminates a negative pressure in the pump room, thereby the lubricating oil is prevented from flowing into the pump room in large quantities.

Abstract: A vane type vacuum pump 1 is provided in the vicinity of an air intake passage 11 for sucking the air into a pump chamber 2, and communicates a space A on the front side and a space B on the back side of the rotational direction of the vane at the time of the reverse rotation of the vane 6, and includes an escaping groove 21 for allowing a lubricating oil to escape into the space B on the back side from the space A on the front side. The escaping groove 21 is provided in a side plate 4, and a wall surface 21A of the escaping groove which becomes the back side of the rotational direction of the vane at the time of the reverse rotation of the vane 6 becomes an inclined surface whose opening side is further expanded than a bottom 21B of the escaping groove 21. The other wall surface 21C of the escaping groove 21 also is preferably made into the inclined surface whose opening side is further expanded than the bottom.

Abstract: A vane pump comprising a housing, a rotor and a vane is provided. The housing comprises a pump room having an approximately circular inner wall. The rotor rotates at an eccentric position relative to a center of the pump room and slides in contact with a part of the inner wall of the pump room. The vane is rotated by the rotor, for dividing the pump room into a plurality of spaces full-time. In the housing, among spaces divided by a center line drawn between the center of the pump room and a center of rotation of the rotor, an intake passage in one space and an exhaust passage in the other space are formed, respectively. An oil supply passage is formed in the rotor and the housing. A lubricating oil is intermittently fed through a communicating hole of the oil supply passage.

Abstract: After a vane 4 passes an oil supply groove 13 formed in a housing 2 due to rotation of a rotor 3, a branch passage 12a of an oil supply passage formed in a shank 3B of the rotor communicates with the oil supply groove 13, then a lubricating oil flows into a pump room 2A through the oil supply groove 13. Then, owing to a differential pressure between a first space A and a second space B, the lubricating oil which flowed into the first space is spouted in the direction opposite to the rotational direction, being blown against the vane which subsequently passes, thereby sealing a gap between the vane and the pump room can be rapidly carried out. Even if the lubricating oil is not sufficiently fed into the pump room, a vane pump can rapidly exert its original performance.

Abstract: An oil supply groove 12 in communication with a pump room 2A is formed above a bearing 2B of a housing 2, and an open air groove 14 in communication with an atmospheric air is formed at a position rotated around the bearing 2B by 90° from the oil supply groove. In a shank 3B of a rotor 3, a branch passage 11a branching from an oil passage 11 formed in its axial direction to the diametrical direction of the shank, and an open air passage 13 formed in the direction perpendicular to the branch passage are formed. Then, the branch passage and the oil supply groove communicate with each other, at the same time, the open air passage and the open air groove are arranged to also communicate with each other, and when the oil passage and the oil supply groove communicate with each other as the rotor stops, then an atmospheric air flowing in from the open air passage eliminates a negative pressure in the pump room, thereby the lubricating oil is prevented from flowing into the pump room in large quantities.