When coils of a vacuum pump unit are excited by energization, a piston equipped with magnets reciprocates in a cylinder. Thus, air is sucked in from an outlet passage of a diffuser of an ejector, and air discharged from the vacuum pump unit is supplied to an inlet of a nozzle of the ejector. Conseq
When coils of a vacuum pump unit are excited by energization, a piston equipped with magnets reciprocates in a cylinder. Thus, air is sucked in from an outlet passage of a diffuser of an ejector, and air discharged from the vacuum pump unit is supplied to an inlet of a nozzle of the ejector. Consequently, a fast jet occurs in a throat portion of the nozzle, and a negative pressure of higher degree of vacuum than that of the suction negative pressure of the vacuum pump unit is produced at a vacuum port of the ejector. The negative pressure is supplied from a negative pressure supply port. The ejector can supply a negative pressure of high degree of vacuum while reducing the load on the vacuum pump unit.
대표청구항▼
What is claimed is: 1. A negative pressure supply apparatus comprising: an ejector having a nozzle and a diffuser disposed downstream of said nozzle, said ejector having a vacuum port opening between said nozzle and said diffuser; and a vacuum pump having a suction port connected to an outlet of sa
What is claimed is: 1. A negative pressure supply apparatus comprising: an ejector having a nozzle and a diffuser disposed downstream of said nozzle, said ejector having a vacuum port opening between said nozzle and said diffuser; and a vacuum pump having a suction port connected to an outlet of said diffuser, said vacuum pump including: a piston slidably fitted in a cylinder; a rod secured in said cylinder and extending along a central axis of said cylinder such that movement of said piston is guided by said rod; a plurality of coils provided on an outer peripheral portion of said cylinder; a magnetic path member and a plurality of magnets provided on an outer peripheral portion of said piston; and an annular seal disposed centrally on said magnets to divide the interior of said cylinder into two pump chambers, said vacuum pump being operable by the movement of said piston driven by electrical energization of said plurality of coils so as to produce a negative pressure, wherein a negative pressure of higher degree of vacuum than that of the suction negative pressure of said vacuum pump is produced at said vacuum port of said ejector by operation of said vacuum pump, and the negative pressure of higher degree of vacuum can be supplied to a negative pressure operated device which is operated by a negative pressure, and wherein said vacuum port of said ejector and said suction port of said vacuum pump are connected through respective check valves to a negative pressure supply port which is connected to the negative pressure operated device, so that either one of two negative pressures at said vacuum port and said suction port that is higher in degree of vacuum than the other is supplied from said negative pressure supply port to the negative pressure operated device. 2. A negative pressure supply apparatus according to claim 1, wherein said pump chambers of said vacuum are configured for sucking and discharging air at both ends of said piston. 3. A negative pressure supply apparatus according to claim 1, wherein said ejector has a two-dimensional configuration formed from a planar recess provided on a plane surface. 4. A negative pressure supply apparatus comprising: an ejector having a nozzle and a diffuser disposed downstream of said nozzle, said ejector having a vacuum port opening between said nozzle and said diffuser; and a vacuum pump having a suction port connected to an outlet of said diffuser, said vacuum pump including: a piston slidably fitted in a cylinder; a rod secured in said cylinder and extending along a central axis of said cylinder such that movement of said piston is guided by said rod; a plurality of coils provided on an outer peripheral portion of said cylinder; a magnetic path member and a plurality of magnets provided on an outer peripheral portion of said piston; and an annular seal disposed centrally on said magnets to divide the interior of said cylinder into two pump chambers, said vacuum pump being operable by the movement of said piston driven by electrical energization of said plurality of coils so as to produce a negative pressure, wherein a negative pressure of higher degree of vacuum than that of the suction negative pressure of said vacuum pump is produced at said vacuum port of said ejector by operation of said vacuum pump, and the negative pressure of higher degree of vacuum can be supplied to a negative pressure operated device which is operated by a negative pressure, wherein said vacuum pump and said ejector are joined to each other through a manifold unit which includes a suction passage for communication between said outlet of said diffuser and said suction port of said vacuum pump, and wherein said manifold unit further includes a discharge passage for communication between an inlet of said nozzle of said ejector and a discharge port of said vacuum pump. 5. A negative pressure supply apparatus comprising: an ejector having a nozzle and a diffuser disposed downstream of said nozzle, said ejector having a vacuum port opening between said nozzle and said diffuser; and a vacuum pump having at least one suction port connected to an outlet of said diffuser, said vacuum pump including: a piston adapted to travel back and forth in a cylinder; a plurality of coils provided on said cylinder; a magnet provided on said piston; and a seal disposed between said cylinder and said piston to divide an interior of said cylinder into two pump chambers for sucking and discharging air at both ends of said piston, said vacuum pump being operable by the reciprocating movement of said piston driven by electrical energization of said plurality of coils, so as to produce a negative pressure in each of said pump chambers, wherein a negative pressure of higher degree of vacuum than that of the suction negative pressure of said vacuum pump is produced at said vacuum port of said ejector by operation of said vacuum pump, and the negative pressure of higher degree of vacuum can be supplied to a negative pressure operated device which is operated by a negative pressure, and wherein said vacuum pump further comprises: a plurality of discharge ports being connected to said pump chambers of said vacuum pump, and a discharge passage for communication between an inlet of said nozzle of said ejector and said discharge ports of said pump chambers of said vacuum pump. 6. A negative pressure supply apparatus according to claim 5, wherein said ejector has a two-dimensional configuration formed from a planar recess provided on a plane surface. 7. A negative pressure supply apparatus according to claim 5, wherein said vacuum pump and said ejector are joined to each other. 8. A negative pressure supply apparatus according to claim 7, wherein said vacuum pump has a plurality of suction ports, each of said pump chambers of said vacuum pump communicates with at least one of the plurality of suction ports, said vacuum pump and said ejector are joined to each other through a manifold unit which includes a suction passage for communication between said outlet of said diffuser and the suction ports of said pump chambers of said vacuum pump. 9. A negative pressure supply apparatus comprising: an ejector having a nozzle and a diffuser disposed downstream of said nozzle, said ejector having a vacuum port opening between said nozzle and said diffuser; and a vacuum pump having at least one suction port connected to an outlet of said diffuser, said vacuum pump including: a piston adapted to travel back and forth in a cylinder; a plurality of coils provided on said cylinder; a magnet provided on said piston; and a seal disposed between said cylinder and said piston to divide an interior of said cylinder into two pump chambers for sucking and discharging air at both ends of said piston, said vacuum pump being operable by the reciprocating movement of said piston driven by electrical energization of said plurality of coils, so as to produce a negative pressure in each of said pump chambers, wherein a negative pressure of higher degree of vacuum than that of the suction negative pressure of said vacuum pump is produced at said vacuum port of said ejector by operation of said vacuum pump, and the negative pressure of higher degree of vacuum can be supplied to a negative pressure operated device which is operated by a negative pressure, and wherein said vacuum port of said ejector and said suction port of said vacuum pump are connected through respective check valves to a negative pressure supply port which is connected to said negative pressure operated device, so that either one of two negative pressures at said vacuum port and said suction port that is higher in degree of vacuum than the other is supplied from said negative pressure supply port to said negative pressure operated device. 10. A negative pressure supply apparatus according to claim 9, wherein said ejector has a two-dimensional configuration formed from a planar recess provided on a plane surface. 11. A negative pressure supply apparatus according to claim 9, wherein said vacuum pump and said ejector are joined to each other. 12. A negative pressure supply apparatus comprising: an ejector having a nozzle and a diffuser disposed downstream of said nozzle, said ejector having a vacuum port opening between said nozzle and said diffuser; and a vacuum pump having a suction port connected to an outlet of said diffuser, said vacuum pump having an electrical motor configured to cause relative movement between a plurality of coils and at least one magnet, the motor being operable by electrical energization of said coils so that said vacuum pump can produce a negative pressure, wherein said vacuum pump and said ejector are joined to each other, and wherein a negative pressure of higher degree of vacuum than that of the suction negative pressure of said vacuum pump is produced at said vacuum port of said ejector by operation of said vacuum pump, and the negative pressure of higher degree of vacuum can be supplied to a negative pressure operated device which is operated by a negative pressure, wherein each of said vacuum pump and said ejector are formed as a unit, respectively, wherein said vacuum pump and said ejector are joined to each other through a manifold unit which includes a suction passage for communication between said outlet of said diffuser and said suction port of said vacuum pump, and wherein said manifold further includes a discharge passage for communication between an inlet of said nozzle of said ejector and a discharge port of said vacuum pump. 13. A negative pressure supply apparatus according to claim 12, wherein said vacuum pump further comprises: a piston adapted to travel back and forth in a cylinder; a magnetic path member, wherein said magnetic path member and said at least one magnet are provided on said piston; and a seal disposed between said cylinder and said piston to divide an interior of said cylinder into two pump chambers for sucking and discharging air at both ends of said piston, wherein said plurality of coils are provided on said cylinder and said vacuum pump is operable by the reciprocating movement of said piston driven by electrical energization of said plurality of coils, so as to produce a negative pressure in each of said pump chambers. 14. A negative pressure supply apparatus according to claim 13, wherein said vacuum pump and said ejector are joined to each other, such that the axis along which said piston travels back and forth and the central axis of said ejector are parallel to each other. 15. A negative pressure supply apparatus according to claim 13, wherein said vacuum pump has a rod that is secured in said cylinder and extends along a central axis of the cylinder such that movement of said piston is guided by said rod.
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이 특허에 인용된 특허 (3)
Kranz Walter (Taufkirchen DT) Tillmann Heinz (Ottobrunn DT), Electrofluidic converter.
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