Reciprocating piston drive mechanism
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Accused Products
Abstract
A reciprocating piston drive mechanism, especially for a reciprocating piston vacuum pump, includes a cylinder (3) embodied in a housing (12). A piston (4) is moved back and forth in the cylinder by an electromagnetic drive that has an electromagnet (11) on the stator side and at least one permanent magnet (18, 19) on the piston side. In order to increase service life of said drive mechanism, permanent magnets (15, 16) are also provided on the stator side. The piston permanent magnet(s) (18, 19) and the stator permanent magnets (15, 16) are configured and disposed in such a way that the piston (4) is magnetically biased to a substantially central axial position in the idle state.
38 Citations
28 Claims
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1. (canceled)
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3. A reciprocating piston drive mechanism, comprising:
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a housing, a cylinder defined in said housing, stator permanent magnets disposed in the cylinder, a piston mounted for back and forth movement in the cylinder, face sides of the piston being equipped with recesses, which correspond to the dimensions of the stator permanent magnets, an electromagnetic drive for the piston including an electromagnet on a stator side and at least one permanent magnet on the piston, the stator permanent magnets being disposed relative to the permanent magnet of the piston in such a way that the piston adopts a substantially centered axial position in an idle state. - View Dependent Claims (2)
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4. A reciprocating piston drive mechanism comprising:
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a housing, a cylinder defined in said housing, a piston mounted for back and forth movement in the cylinder, an electromagnetic drive for the piston including an electromagnet on a stator side and at least one permanent magnet on the piston, stator permanent magnets disposed on the stator side and disposed relative to the permanent magnet of the piston in such a way that the piston adopts a substantially centered axial position in an idle state, a pole component with a cross section having a U-shape and U-limbs which end at a level of the permanent magnets on the stator side. - View Dependent Claims (5, 6, 7)
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8. A reciprocating piston drive mechanism comprising:
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a housing, a piston mounted for back and forth movement in a cylinder, the piston being equipped only with a single permanent magnet situated approximately centrally in an axial directions, an electromagnet on a stator which interacts with the permanent magnet on the piston to drive the piston, stator permanent magnets disposed on the stator and disposed relative to the permanent magnet of the piston in such a way that the piston is biased toward a substantially centered axial position in an idle state. - View Dependent Claims (9, 10)
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11. A reciprocating piston drive mechanism comprising:
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a housing, a cylinder defined in said housing, a piston mounted for back and forth movement in the cylinder, a rotationally symmetrical electromagnetic drive for the piston including an electromagnet on a stator and at least one ring-shaped permanent magnet on the piston, stator permanent magnets disposed on the stator and disposed relative to the ring-shaped permanent magnet of the piston in such a way that the piston is biased to a preselected axial position in an idle state. - View Dependent Claims (12)
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13. A reciprocating piston drive mechanism comprising:
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a housing in which a cylinder is defined, a stator surrounding the cylinder, a piston mounted for back and forth movement in the cylinder, an electromagnetic drive for the piston including an electromagnet, permanent magnets, and pole components in the stator and at least one permanent magnet on the piston, at least one of the pole components interacting with the stator magnets such that resultant magnetic forces are axially asymmetrical, the stator permanent magnets being disposed relative to the piston permanent magnet to bias the piston toward a substantially centered axial position in an idle state. - View Dependent Claims (24, 25)
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14. A reciprocating piston drive mechanism comprising:
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a housing, a cylinder defined in said housing, a piston mounted for back and forth movement in the cylinder, an electromagnetic drive for the piston including an electromagnet on a stator and at least one permanent magnet on the piston, sensors for detecting the piston'"'"'s position, stator permanent magnets disposed on the stator relative to the piston permanent magnet to urge the piston to adopt a substantially centered axial position in an idle state.
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15. A reciprocating piston drive mechanism comprising:
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a housing, a cylinder defined in said housing, a piston mounted in the cylinder for back and forth movement, the piston and the cylinder defining two chambers, at least one of two chambers created by the piston and the cylinder being equipped with an inlet valve and a discharge valve, an electromagnetic drive for the piston including a stator electromagnet and at least one piston permanent magnet, stator permanent magnets disposed relative to the piston permanent magnet for biasing the piston to a substantially center axial position. - View Dependent Claims (27, 28)
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16. A reciprocating piston vacuum pump comprising:
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a housing;
a cylinder defined in the housing;
a piston mounted in the cylinder, the piston and cylinder defining a pair of chambers on opposite sides of the piston, the piston mounted for reciprocating movement in the cylinder, which reciprocating movement expands one of the chambers as it contracts the other;
an inlet line opening into at least one of the chambers, the opening of said inlet line forming together with the piston an inlet valve, at least one permanent magnet mounted on the piston;
permanent magnets mounted on a stator such that magnetic forces between the stator permanent magnets and the piston permanent magnet urge the piston toward a substantially central axial position; and
,an electromagnet on the stator for selectively urging the permanent magnet on the piston to move the piston along the cylinder.
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17. A reciprocating piston pump comprising:
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a housing;
a cylinder defined in the housing;
a piston mounted in the cylinder, the piston and cylinder defining a pair of chambers on opposite sides of the piston, the piston mounted for reciprocating movement in the cylinder, which reciprocating movement expands one of the chambers as it contracts the other;
discharge valves which are controlled by one of pressure and the piston, at least one permanent magnet mounted toga piston;
permanent magnets mounted on a stator such that magnetic forces between the stator permanent magnets and the piston permanent magnet bias the piston toward a substantially centered position axially; and
,an electromagnet on the stator for selectively urging the permanent magnet on the piston to reciprocate the piston in the cylinder. - View Dependent Claims (18, 19, 20, 21)
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22. A reciprocating piston drive mechanism comprising:
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a housing;
several cylinders accommodated in the housing, a piston mounted in each of the cylinders, the pistons and cylinders defining pairs of chambers on opposite sides of each piston, each piston being mounted for reciprocating movement in a corresponding one of the cylinders, which reciprocating movement expands one of the chambers as it contracts the other;
at least one permanent magnet mounted on each piston;
permanent magnets mounted on a stator such that magnetic forces between the stator permanent magnets and the piston permanent magnets urge the pistons toward selected axial positions; and
,an electromagnet on the stator for selectively reciprocating each piston along the corresponding cylinder. - View Dependent Claims (26)
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23. A drive mechanism comprising:
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a housing;
a cylinder defined in the housing;
a piston mounted in the cylinder, the piston and cylinder defining a pair of chambers on opposite sides of the piston, the piston mounted for reciprocating movement in the cylinder, which reciprocating movement expands one of the chambers as it contracts the other;
at least one permanent magnet mounted on the piston;
permanent magnets mounted on a stator such that magnetic forces between the stator permanent magnets and the piston permanent magnet bias the piston;
an electromagnet on the stator for selectively urging the permanent magnet on the piston to move the piston along the cylinder; and
,a switching means for driving the electromagnet coil, said switching means being driven by signals dependent on the piston'"'"'s position.
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Specification