JP2008223630A - Vane pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane pump which smoothly moves each vane so that its edge moves along the inner peripheral surface of a pump chamber, thereby prevents the vane from failing to project from the outer peripheral surface of a rotor, and also prevents the wear of the vane and rotor. <P>SOLUTION: The vane pump comprises: the pump chamber 2; the rotor 3 enclosed in the pump chamber 2; and a plurality of vanes 4 circumferentially provided at the outer peripheral part of the rotor 3. Each vane 4 is pivoted on the outer peripheral part of the rotor 3, and its edge is movable in a direction to contact or separate from the outer peripheral surface of the rotor 3. The edge of each vane 4 comes in sliding contact with the inner peripheral surface of the pump chamber 2. The vane pump also comprises a working chamber 5 surrounded by the inner peripheral surface of the pump chamber 2, the outer peripheral surface of the rotor 3 and the vanes 4 and changed in volume by the rotational driving of the rotor 3; a suction port part 6 allowing an operating fluid to flow into the working chamber 5 in a volume enlarging process; and a discharge port part 7 discharging the operating fluid from the working chamber 5 in a volume reducing process. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vane pump.

  As a conventional vane pump, for example, the one shown in Patent Document 1 is known. The vane pump 1 houses a rotor 3 at an eccentric position of a pump chamber 2 formed in a casing 10 as shown in FIG. The rotor 3 is formed with a plurality of radially extending vane grooves 30, and the vane 4 whose tip is in sliding contact with the inner peripheral surface 2 a of the pump chamber 2 is slidable in the radial direction of the rotor 3. Provided. When the rotor 3 is driven to rotate, the tip of each vane 4 comes into sliding contact with the inner peripheral surface 2 a of the pump chamber 2, thereby comprising a space surrounded by the inner surface of the pump chamber 2, the outer peripheral surface of the rotor 3, and the vane 4. The volume of the working chamber 5 changes in size, and the working fluid is sucked from the suction port 6 through the working chamber 5 and discharged from the discharge port 7. In FIG. 7, reference numeral 26 denotes a spring material provided in the vane groove 30.

By the way, each vane 4 has a sliding resistance with respect to the vane groove 30, and particularly when the rotor 3 is driven to rotate, each vane 4 has a rotor such as a working fluid pressure or a sliding resistance with the inner peripheral surface of the pump chamber 2. 3, a force in the direction opposite to the rotational direction of 3, that is, a force in a direction perpendicular to the sliding direction of the vane 4 with respect to the rotor 3 is received. For this reason, the sliding resistance with respect to the vane groove 30 of each vane 4 increases, and there is a possibility that the vane 4 does not slide smoothly in the radial direction of the rotor 3 and the vane 4 does not protrude from the outer peripheral surface of the rotor 3. In addition, the vane 4 and the rotor 3 are easily worn.
Japanese Patent Laid-Open No. 62-291488

  This invention is invented in view of the said conventional problem, Comprising: It aims at providing the vane pump which can move a vane smoothly.

  In order to solve the above problems, a vane pump according to the present invention includes a pump chamber 2, a rotor 3 housed in the pump chamber 2, and a plurality of vanes 4 provided in the circumferential direction on the outer periphery of the rotor 3. The tip is pivotally supported by the outer periphery of the rotor 3 so that the tip is movable in the contact / separation direction with respect to the outer periphery of the rotor 3, and the tip is slidably contacted with the inner periphery 2 a of the pump chamber 2. 3 and the vane 4, the working chamber 5 that changes its volume by rotating the rotor 3, the suction port 6 that allows the working fluid to flow into the working chamber 5 in the volume expansion process, and the operation in the volume reduction process A discharge port portion 7 for discharging the working fluid from the chamber 5 is provided. In this way, each vane 4 is pivotally supported on the outer peripheral portion of the rotor 3, and the tip is movable in the contact / separation direction with respect to the outer peripheral surface of the rotor 3. Thus, an increase in sliding resistance with respect to the rotor 3 can be prevented, and each vane 4 can be smoothly moved so that the tip is along the inner peripheral surface of the pump chamber 2.

  Further, the front end side of each vane 4 is disposed on the front side with respect to the rotation direction of the rotor 3, the rear end side is disposed on the rear side with respect to the rotation direction of the rotor 3, and the rear end portion of each vane 4 is disposed on the rotor 3. It is also preferable to pivot on the outer periphery. In this case, when the rotor 3 is rotationally driven, each vane 4 receives a force in the direction in which the tip of the vane 4 moves away from the outer peripheral surface of the rotor 3 from the front working fluid in the rotation direction of the rotor 3. The portion can be brought into close contact with the inner peripheral surface 2a of the pump chamber 2 and brought into sliding contact.

  It is also preferable to coat at least the tip of each vane 4 with an abrasion resistant material. In this case, it is possible to reduce wear at the tip of the vane 4 that is in sliding contact with the inner peripheral surface of the pump chamber 2.

  It is also preferable that each vane 4 is made of an abrasion resistant material. Wear of the tip of the vane 4 that is in sliding contact with the inner peripheral surface of the pump chamber 2 can be reduced.

  It is also preferable to coat the inner peripheral surface 2a of the pump chamber 2 with a DLC film. In this case, wear of the inner peripheral surface 2a of the pump chamber 2 caused by the sliding contact of the tip of the vane 4 can be reduced.

  It is also preferable that the inner peripheral edge portion of the pump chamber 2 is constituted by a ring material 17 made of an abrasion resistant material. In this case, wear of the inner peripheral surface 2a of the pump chamber 2 caused by the sliding contact of the tip of the vane 4 can be reduced.

  In the invention according to claim 1, the sliding resistance of each vane to the rotor is suppressed by pivotally supporting each vane on the outer peripheral portion of the rotor and allowing the tip to move in the contact and separation direction with respect to the outer peripheral surface of the rotor. Each vane can be smoothly moved so that the tip thereof is along the inner peripheral surface of the pump chamber, and it is possible to prevent a problem that the vane does not protrude from the outer peripheral surface of the rotor or that the vane and the rotor are worn.

  In addition, in the invention according to claim 2, in addition to the effect of the invention according to claim 1, the tip of each vane can be securely brought into close contact with the inner peripheral surface of the pump chamber and slidably contacted. It can be.

  In addition, in the inventions according to claims 3 and 4, in addition to the effects of the invention according to claim 1 or 2, it is possible to reduce wear of the tip of the vane.

  In the inventions according to claims 5 and 6, in addition to the effects of the invention according to any one of claims 1 to 4, it is possible to reduce wear on the inner peripheral surface of the pump chamber.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. As shown in FIG. 1 to FIG. 5, the vane pump 1 of the present invention has a rotor 3 eccentrically housed in a pump chamber 2 formed in a casing 10, and a tip is slidably contacted with an inner peripheral surface 2 a of the pump chamber 2. The rotor 3 is provided with a plurality of vanes 4, the suction port 6 and the discharge port 7 are provided in the casing 10 so as to reach the pump chamber 2, and the rotor 3 is rotationally driven by the stator 23, thereby The volume of the working chamber 5 that is a space surrounded by the outer peripheral surface of the rotor 3 and the vanes 4 is changed in size to discharge the working fluid from the suction port 6 through the discharge port 7 through the working chamber 5. It is. In the following description, it is assumed that one side in the thrust direction of the rotor 3 (the axial direction of the rotor 3) is the upper side and the other side is the lower side.

  A casing 10 that houses the rotor 3 is composed of an upper case 11 and a lower case 12. The upper case 11 has an upper recess 15 that opens downward, and an annular ring material 17 is fitted in the upper recess 15. Reference numeral 13 shown in FIGS. 1 and 3 is a pin for positioning and supporting the ring material 17. The lower case 12 has a cylindrical portion 24 protruding upward, and the casing 10 is formed by fitting the cylindrical portion 24 to the lower end portion of the upper recess 15. In FIG. 1, reference numeral 14 denotes a fastener hole for fastening the upper case 11 and the lower case 12.

  The inside of the cylindrical portion 24 of the lower case 12 is a lower recess 16 that opens upward. A shaft attachment hole 21 is formed at the center of the bottom of the lower recess 16. The lower part of the shaft member 32 a is fitted into the shaft attachment hole 21 and is fixed so as not to rotate. The shaft member 32 a is located at an eccentric position of the circular pump chamber 2 formed in the plan view formed inside the ring member 17. Thus, the shaft portion 32 that rotatably supports the rotor 3 is configured. The pump chamber 2 includes a bottom surface of the upper recess 15, an inner peripheral surface of the ring material 17, and an inner surface of the lower recess 16.

  The rotor 3 is formed in a circular shape in plan view, and is composed of an upper rotor body 8 and a magnet portion 22 composed of a lower permanent magnet. In the rotor 3, the outer peripheral surface 8 a of the rotor body 8 having a circular shape in plan view is opposed to the inner peripheral surface of the ring material 17 constituting the inner peripheral edge of the pump chamber 2 (that is, the inner peripheral surface 2 a of the pump chamber 2). 3 is accommodated in the pump chamber 2 so that the upper surface of the rotor body 8 serving as one of the thrust surfaces is in close proximity to the bottom surface of the upper recess 15 constituting the inner bottom surface of the pump chamber 2. A flange portion 9 is provided around the lower end portion of the rotor body 8, and the outer peripheral edge portion of the flange portion 9 is close to and opposed to the lower surface of the inner peripheral edge portion of the ring member 17.

  A vane storage portion 19 including a notch for storing each vane 4 is formed at a plurality of locations at equal intervals in the circumferential direction in the outer peripheral portion above the flange portion 9 of the rotor body 8. Each vane storage portion 19 opens to the outer peripheral surface side of the rotor body 8 and opens upward. One end portion of each vane storage portion 19 in the circumferential direction of the rotor 3 is a portion for storing the rear end portion of the vane 4, and the rear end portion of the vane 4 is placed on the lower bottom surface of the same portion and the upper bottom surface closing the upper portion of the same portion. A shaft hole 18a is bored as a pivotal support portion 18 that pivotally supports the shaft.

  Each vane 4 is formed in a blade shape, and in this example, it is formed in a claw shape that becomes narrower toward the tip side. Each vane 4 is arranged on the flange portion 9 of the rotor body 8 with the tip end on the rear side with respect to the rotation direction of the rotor 3 and with the rear end side on the front side with respect to the rotation direction of the rotor 3. . At the rear end of each vane 4, a pivot portion 4 a is vertically projected, and the upper and lower pivot portions 4 a are pivotally supported by the upper and lower shaft holes 18 a of each vane storage portion 19. As a result, each vane 4 is rotatable about the vertical axis with the pivot portion 4a as the center of rotation, and the tip is movable in the contact / separation direction with respect to the outer peripheral surface of the rotor body 8 as shown by the arrow b in FIG. It is freely accessible. Each vane 4 is accommodated in the vane accommodating portion 19 in a state where the tip thereof is close to the rotor body 8.

  The magnet portion 22 is housed in the lower recess 16, and a bearing hole 29 extending from the lower surface of the magnet portion 22 to the rotor body 8 is formed in the rotor 3. The bearing member 20 is fitted into the bearing hole 29, and the bearing member 20 is located at the center of the rotor 3. A shaft member 32a is inserted into the tubular bearing member 20 so as to be rotatable, whereby the rotor 3 is rotatable about the shaft member 32a.

  The upper case 11 is formed with a suction port portion 6 for drawing the working fluid into the working chamber 5 and a discharge port portion 7 for discharging the working fluid from the working chamber 5. The suction port portion 6 and the discharge port portion 7 are formed in the upper case 11. Projecting in the same direction. The suction port portion 6 and the discharge port portion 7 communicate with the pump chamber 2 serving as the working chamber 5 through the through hole 17 a of the ring material 17.

A stator housing recess 34 is formed on the lower surface of the lower case 12, and the stator 23 is disposed in the stator housing recess 34. That is, the rotor 3, the vanes 4, and the shaft member 32 a are disposed in the pump chamber 2 that is a sealed space, whereas the stator 23 is disposed outside the pump chamber 2. The rotor 3 arranged in the pump chamber 2 is rotationally driven through the casing 10 by the electromagnetic force of the arranged stator 23. The rotor 3 is driven by the stator 23 in the same manner as a general one, and a rotational torque is generated in the magnet portion 22 by the magnetic action between the stator 23 and the magnet portion 22, and the magnet portion 22 and eventually the rotor 3 are driven by this rotational torque. It is rotationally driven. Incidentally rotational driving direction of the rotor 3 of this embodiment is the direction indicated by the arrow a ₁ in FIG. 1 and FIG.

  When the rotor 3 is rotationally driven by the stator 23, each vane 4 is rotated in a direction away from the rotor body 8 around the pivot portion 4 a under the action of centrifugal force due to the rotation of the rotor 3. Then, the tip is brought into sliding contact with the inner peripheral surface 2 a of the pump chamber 2. At this time, the pump chamber 2 includes the working chamber 5 surrounded by the inner surface of the pump chamber 2, the rotor 3 and the vane 4 (specifically, the inner peripheral surface of the ring member 17, the upper bottom surface of the upper recess 15, the rotor body 8). The outer peripheral surface above the flange portion 9, the upper surface of the flange portion 9 of the rotor body 8, and a plurality of working chambers 5) surrounded by the vanes 4 are formed. Since the rotor main body 8 is in an eccentric position of the pump chamber 2 formed inside the ring material 17, the inner peripheral surface 2 a of the pump chamber 2 (the inner peripheral surface of the ring material 17) and the outer peripheral surface 8 a of the rotor main body 8. The distance varies depending on the rotational position of the rotor 3 and the amount of protrusion of the vane 4 from the rotor 3 also varies depending on the rotational position of the rotor 3. By rotating the rotor 3, each working chamber 5 rotates in the rotational direction of the rotor 3. The volume is changed to large or small while moving to. That is, the volume of each working chamber 5 increases with the rotation of the rotor 3 when it is in a position communicating with the suction port 6, and the volume decreases with the rotation of the rotor 3 when it is in a position communicating with the discharge port 7. To be done. Accordingly, when the rotor 3 is driven to rotate, the working fluid flows into the working chamber 5 communicating with the working fluid from the suction port portion 6 and is compressed in the working chamber 5 and then discharged from the discharge port portion 7 to function as a pump. To do.

  In the vane pump 1 of the present example described above, each vane 4 is pivotally supported on the outer peripheral portion of the rotor 3 so that the tip is movable in the contact / separation direction with respect to the outer peripheral surface of the rotor 3. 3, the sliding resistance of each vane 4 with respect to the rotor 3 does not increase as in the conventional case, and the tip of each vane 4 follows the inner peripheral surface of the pump chamber 2. Will move smoothly. In this example, the front end side of each vane 4 is arranged on the rear side with respect to the rotation direction of the rotor 3, and the rear end side is arranged on the front side with respect to the rotation direction of the rotor 3. Since the direction of rotation is opposite to the direction of rotation, when the rotor 3 is driven to rotate, each vane 4 is in the direction in which the tip of the vane 4 approaches the outer peripheral surface of the rotor 3 from the working fluid on the front side in the direction of rotation of the rotor 3. Receive the power of For this reason, the sliding resistance with respect to the internal peripheral surface 2a of the pump chamber 2 of the front-end | tip part of each vane 4 can be reduced, and the load of the stator 23 which comprises a drive part can be reduced.

Further, as shown in FIG. 6, it is also preferable to arrange the front end side of each vane 4 on the front side with respect to the rotation direction of the rotor 3 and the rear end side on the rear side with respect to the rotation direction of the rotor 3. in the present example, the direction indicated by the rotational driving direction of the rotor 3 in the arrow a ₂ in FIG. In this case, when the rotor 3 is rotationally driven, each vane 4 receives a force in a direction in which the tip of the vane 4 moves away from the outer peripheral surface of the rotor 3 from the working fluid on the front side in the rotational direction of the rotor 3. For this reason, the front-end | tip part of each vane 4 can be closely_contact | adhered to the inner peripheral surface 2a of the pump chamber 2, and can be slidably contacted, and pump efficiency can be improved. In FIG. 6, the rear end portion of each vane 4 is pivotally supported on the outer peripheral portion of the rotor 3 as in FIG. 5.

  Moreover, it is preferable to coat at least the tip of each vane 4 with an abrasion-resistant material that is more excellent in abrasion resistance than the vane 4. In this case, the wear-resistant material includes TFE (tetrafluoroethylene), PPS (polyphenylene sulfide), POM (polyoxymethylene), PE (polyethylene), PEEK (polyether ether ketone), which are excellent in lubricity. By coating such a wear-resistant material on the tip of the vane 4, the wear of the tip of the vane 4 that is in sliding contact with the inner peripheral surface of the pump chamber 2 can be reduced. The coating with the wear resistant material may be applied only to the tip of the vane 4 or may be applied to the entire vane 4.

  It is also preferable that each vane 4 is made of an abrasion-resistant material having excellent abrasion resistance. Examples of the wear-resistant material in this case include materials having excellent lubricity such as ceramics, inorganic materials such as carbon, and the like. It is possible to reduce the wear of the front end of the.

  It is also preferable to coat the inner peripheral surface 2a of the pump chamber 2 (the inner peripheral surface of the ring material 17) with a DLC (diamond-like carbon) film. In this case, the pump chamber generated by the sliding contact of the tip of the vane 4 The wear of the inner peripheral surface 2a can be reduced.

  Moreover, it is also preferable that the ring member 17 constituting the inner peripheral edge of the pump chamber 2 is made of an abrasion resistant material that is more excellent in abrasion resistance than the casing 10. Examples of the wear resistant material in this case include materials having excellent lubricity, such as ceramics, and the inner peripheral surface 2a of the pump chamber 2 can also be configured by forming the ring material 17 with such wear resistant material. Wear can be reduced.

  It is also preferable that each vane 4 is made of an elastic body such as rubber. In this case, the sliding resistance of the vane 4 with the inner peripheral surface of the pump chamber 2 can be reduced, and the inside of the vane 4 and the pump chamber 2 can be reduced. The wear of the peripheral surface can be reduced.

  In the above-described embodiment, the pump chamber 2 is formed in a circular shape in plan view, but may be formed in an elliptical shape in plan view. Further, the shaft portion 32 is fixedly provided on the casing 10, and the bearing including the bearing member 20 fixedly provided on the rotor 3 by the shaft portion 32 is rotatably supported. May be fixedly provided, and the shaft portion may be rotatably supported by a bearing fixedly provided on the casing 10. In addition, the drive unit that rotationally drives the rotor 3 includes the stator 23 and the magnet unit 22 that generate a magnetic action. The drive unit has a structure in which a shaft fixed to the rotor 3 is rotationally driven by a motor. It may be adopted. The working fluid of the vane pump 1 includes liquids such as water, alcohol and antifreeze, but may be gas.

It is a horizontal sectional view of the vane pump which shows an example of an embodiment of the invention. It is a disassembled perspective view of a vane pump same as the above. It is AA sectional drawing of FIG. It is a top view which shows the state which removed the upper case of the vane pump same as the above. It is a principal part expanded horizontal sectional view same as the above. It is a principal part expanded horizontal sectional view of the vane pump of another example. It is sectional drawing of the conventional vane pump.

Explanation of symbols

1 Vane Pump 2 Pump Chamber 3 Rotor 4 Vane 5 Working Chamber 6 Suction Port 7 Discharge Port

Claims (6)

  A pump chamber, a rotor housed in the pump chamber, and a plurality of vanes provided in the circumferential direction on the outer peripheral portion of the rotor, each vane being pivotally supported by the outer peripheral portion of the rotor, and the tip thereof in the contact and separation direction with respect to the outer peripheral surface of the rotor A working chamber that is movable and has a tip slidably in contact with the inner peripheral surface of the pump chamber, surrounded by the inner surface of the pump chamber, the outer peripheral surface of the rotor, and the vane, and the volume of which is changed by rotating the rotor; A vane pump comprising: a suction port portion for flowing a working fluid into a working chamber in a volume expansion process; and a discharge port portion for discharging the working fluid from the working chamber in a volume reduction process.   The front end side of each vane is arranged on the front side with respect to the rotation direction of the rotor, the rear end side is arranged on the rear side with respect to the rotation direction of the rotor, and the rear end portion of each vane is pivotally supported on the outer periphery of the rotor. The vane pump according to claim 1, wherein:   The vane pump according to claim 1 or 2, wherein at least a tip portion of each vane is coated with an abrasion-resistant material.   The vane pump according to claim 1 or 2, wherein each vane is made of an abrasion-resistant material.   The vane pump according to any one of claims 1 to 4, wherein an inner peripheral surface of the pump chamber is coated with a DLC film.   The vane pump according to any one of claims 1 to 4, wherein the inner peripheral edge of the pump chamber is formed of a ring material made of an abrasion-resistant material.

Images