JP2008128203A - Vane pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane pump capable of preventing a working fluid in an operation chamber from leaking out of between an outer surface of vanes and an inner surface of a rotor chamber. <P>SOLUTION: This vane pump has a rotor 3 stored in the rotor chamber 2, and has a plurality of vanes 4 arranged in the rotor 3 and having the tip in sliding contact with an inner peripheral surface of the rotor chamber 2, and has an operation chamber 5 surrounded by the inner surface of the rotor chamber 2, an outer peripheral surface of the rotor 3 and the vanes 4 and changing its volume large and small by rotational driving of the rotor 3, and has a suction port 6 making the working fluid flow in the operation chamber 5 of a volume expanding process and a delivery port 7 discharging the working fluid from the operation chamber 5 of a volume reducing process. A flexible fin 25 is projected toward the other surface side on at least one surface among an inner bottom surface 2b of the rotor chamber 2 opposed to a thrust surface of the rotor 3 and the outer surface opposed to the inner bottom surface 2b of the rotor chamber 2 of the vanes 4. The fin 25 is in sliding contact with the other surface in the rotational driving of the rotor 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vane pump.

  Conventionally, as a general vane pump, for example, the one shown in FIG. 6 is known. The vane pump 1 stores a rotor 3 in an eccentric manner in a rotor chamber 2. A plurality of vane grooves 19 are formed radially on the rotor 3, and the vanes 4 are slidably accommodated in the respective vane grooves 19. Each vane 4 is movable in the radial direction of the rotor 3. 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 rotor chamber 2, whereby the working chamber surrounded by the inner surface of the rotor chamber 2, the outer peripheral surface 3 a of the rotor 3, and the vane 4. The volume of 5 changes in size, and the working fluid from the suction port 6 is discharged from the discharge port 7 through the working chamber 5. For example, Patent Document 1 discloses a vane pump similar to that shown in FIG.

By the way, in the vane pump 1, there is a risk of leakage from between the inner bottom surface of the rotor chamber 2 facing the thrust surface of the rotor 3 and the outer surface facing the inner bottom surface of the rotor chamber 2 of the vane 4, thereby reducing pump efficiency. For this reason, the inner bottom surface of the rotor chamber 2 and the outer surface of the vane 4 need to be in slidable contact with each other. However, when the inner bottom surface of the rotor chamber 2 and the outer surface of the vane 4 are brought into close sliding contact in this way, the sliding resistance of the vane 4 with respect to the inner bottom surface of the rotor chamber 2 increases, and the rotational speed of the rotor 3 decreases. Pump efficiency will decrease.
Japanese Patent Laid-Open No. 62-291488

  The present invention has been invented in view of the above-mentioned conventional problems, and can seal the gap between the inner bottom surface of the rotor chamber and the outer surface of the vane, thereby preventing the working fluid in the working chamber from leaking out. It is an object of the present invention to provide a vane pump capable of improving the pump efficiency by increasing the number of rotations.

  In order to solve the above problems, a vane pump according to the present invention includes a rotor chamber 2, a rotor 3 housed in the rotor chamber 2, and a plurality of the vane pumps that are provided on the rotor 3 and that are slidably contacted with the inner peripheral surface of the rotor chamber 2 The working chamber 5 is surrounded by the inner surface of the rotor chamber 2, the inner surface of the rotor chamber 2, the outer circumferential surface of the rotor 3, and the vane 4, and the volume is changed by the rotational driving of the rotor 3. A suction port 6 through which the fluid flows in, and a discharge port 7 through which the working fluid is discharged from the working chamber 5 in the volume reduction process, the inner bottom surface 2b of the rotor chamber 2 facing the thrust surface of the rotor 3, and the vane 4 Of the outer surfaces facing the inner bottom surface 2 b of the rotor chamber 2, at least one surface is provided with a flexible fin 25 projecting toward the other surface side, and the fin 25 is rotated when the rotor 3 is driven. This is made in sliding contact with the other surface. The features. Of the inner bottom surface 2 b of the rotor chamber 2 facing the thrust surface of the rotor 3 and the outer surface of the vane 4 facing the inner bottom surface 2 b of the rotor chamber 2, one surface can be directed toward the other surface. A flexible fin 25 is protruded, and the fin 25 is brought into sliding contact with the other surface when the rotor 3 is driven to rotate, so that the flexible inner surface 2b and the vane of the rotor chamber 2 are formed by the flexible fin 25. 4 can be sealed, and the working fluid in the working chamber 5 can be prevented from leaking from the gap. In this case, the fin 25 is flexible, The sliding resistance with respect to the other surface can be reduced.

  A second aspect of the present invention is the first aspect of the present invention, wherein the fin 25 is provided on the outer surface opposite to the inner bottom surface 2b of the rotor chamber 2 of the vane 4 and the fin 25 is disposed on the inner bottom surface 2b of the rotor chamber 2 when the rotor 3 is driven to rotate. The fin 25 is inclined so as to be located on the rear side in the rotation direction of the rotor 3 toward the tip side. The fins 25 provided on the outer surface of the vane 4 can enhance the hermeticity of the working chamber 5, and each fin 25 is inclined so as to be positioned on the rear side in the rotation direction of the rotor 3 toward the tip side. The sliding resistance of the fins 25 with respect to the inner bottom surface 2b of the rotor chamber 2 can be further reduced.

  A third aspect of the present invention provides the fin 25 according to the first aspect, wherein the fin 25 is provided on the inner bottom surface 2b of the rotor chamber 2, and the fin 25 is brought into sliding contact with the outer surface facing the inner bottom surface 2b of the rotor chamber 2, It is made to incline so that it may be located in the rear side in the rotation direction of the rotor 3 toward the side. The fins 25 provided on the inner bottom surface 2b of the rotor chamber 2 can enhance the hermeticity of the working chamber 5, and the fins 25 are inclined toward the front end side so as to be located on the rear side in the rotation direction of the rotor 3. Thus, the sliding resistance of each fin 25 against the outer surface of the vane 4 can be further reduced.

  In the invention according to claim 1, the gap between the inner bottom surface of the rotor chamber and the outer surface of the vane can be sealed by the flexible fin, and the working fluid in the working chamber can flow from between the inner bottom surface of the rotor chamber and the outer surface of the vane. Leakage can be prevented, and the rotational speed of the rotor can be increased to improve pump efficiency.

  Further, in the invention according to claim 2, in addition to the effect of the invention according to claim 1, the fins provided on the outer surface of the vane can enhance the sealing performance of the working chamber, and the fin is moved toward the tip side of the rotor. By inclining so as to be located on the rear side in the rotation direction, the sliding resistance of each fin with respect to the inner surface of the rotor chamber can be further reduced, and the pump efficiency can be further improved.

  In addition, in the invention according to claim 3, in addition to the effect of the invention according to claim 1, the sealing of the working chamber can be enhanced by the fin provided on the inner bottom surface of the rotor chamber, and the fin is directed toward the tip side. By inclining so as to be located on the rear side in the rotational direction of the rotor, the sliding resistance of each fin with respect to the outer surface of the vane can be further reduced, and the pump efficiency can be further improved.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. In the vane pump 1 of the present invention, as shown in FIGS. 2 to 4, the rotor 3 is eccentrically stored in the rotor chamber 2 provided in the casing 10, and the tip is slidably contacted with the inner peripheral surface 2 a of the rotor chamber 2. A plurality of vanes 4 are provided in the rotor 3, a suction port 6 and a discharge port 7 are provided in the casing 10 so as to reach the rotor chamber 2, and the rotor 3 is rotationally driven to rotate the inner surface of the rotor chamber 2 and the outer peripheral surface 3 a of the rotor 3. And the volume of the working chamber 5 surrounded by the vanes 4 are changed in size, and the working fluid from the suction port 6 is discharged from the discharge port 7 through the working chamber 5. This will be described in detail below.

  In this example, the thrust direction of the rotor 3 (the axial direction of the rotor 3) is the vertical direction, and the casing 10 that houses the rotor 3 is positioned above the rotor 3 and below the rotor 3. It is formed by combining the lower case 12 via a packing 13. 3 denotes a fastener hole for fastening the upper case 11 and the lower case 12 together. The upper case 11 is formed with an upper recess 15 that is recessed upward from the mating surface with the lower case 12, and the lower case 12 is formed with a lower recess 16 that is recessed downward from the mating surface with the upper case 11. The rotor chamber 2 is formed by combining the upper recess 15 and the lower recess 16.

  The upper portion of the rotor 3 is positioned in the upper recess 15 and the lower portion of the rotor 3 is positioned in the lower recess 16. The upper recess 15 has an inner diameter shape larger than the outer diameter of the rotor 3, and The recess 16 has an inner diameter substantially the same as the outer diameter of the rotor 3. That is, the lower recess 16 is formed to have an inner diameter smaller than that of the upper recess 15. When the upper case 11 and the lower case 12 are combined, the lower recess 16 is eccentric to the upper recess 15 like the rotor 3. Located in position. A ring material 17 is fitted to the peripheral portion of the upper recess 15, and the inner peripheral surface of the ring material 17 constitutes the inner peripheral surface 2 a of the rotor chamber 2. The rotor chamber 2 has a circular cross section viewed from the thrust direction of the rotor 3, but can be easily formed into an arbitrary shape such as an elliptical shape in plan view by changing the inner peripheral shape of the ring material 17. Further, the upper case 11 is formed with a suction port 6 for drawing the working fluid into the working chamber 5 and a discharge port 7 for discharging the working fluid from the working chamber 5, and through the through hole 17 a of the ring material 17, the working chamber. 5 are respectively communicated with the rotor chamber 2. A stator 23 is disposed below the lower case 12 so as to be adjacent to the inner bottom surface of the lower recess 16.

  The rotor 3 has a bearing portion 18 at the center and is formed in a circular shape in plan view. A plurality of (four in this example) vane grooves 19 are radially formed in the upper portion of the rotor 3, and a magnetic body 22 made of a magnet is integrally attached to the lower portion of the rotor 3. Further, a slidable contact protrusion 8 is provided on the outer peripheral end of the thrust surface of the rotor 3 (the upper surface 3b of the rotor 3) excluding the vane groove 19.

  The rotor 3 is rotatably inserted through a fixed shaft 20 through which the bearing portion 18 passes vertically through the rotor chamber 2, so that the outer peripheral surface 3 a faces the inner peripheral surface 2 a of the rotor chamber 2 and a thrust surface (upper surface 3 b). Is rotatably arranged in the rotor chamber 2 so as to face the inner bottom surface 2b of the rotor chamber 2 formed by the bottom surface of the upper recess 15. The fixed shaft 20 is supported in a non-rotatable state by a shaft attaching portion 21 provided at an eccentric position of the inner bottom surface 2 b of the opposing rotor chamber 2 and a central portion of the inner bottom surface of the lower recess 16.

  Each vane groove 19 of the rotor 3 accommodates a vane 4 made of a rigid body so as to be slidable in the radial direction of the rotor 3, so that each vane 4 can protrude and retract from the outer peripheral surface 3 a of the rotor 3. The top surface of each vane 4 has a small top surface on the inner bottom surface 2b of the rotor chamber 2 within a range longer than the maximum protruding length from the outer peripheral surface 3a of the rotor 3 from the tip of the vane 4 toward the base end. Projecting portions 24 that face each other through a gap are projected upward. 2 to 4, a minute gap formed between the upper surface of the protrusion 24 and the inner bottom surface 2b of the rotor chamber 2 and fins 25 described later are not shown.

  When the rotor 3 is disposed in the rotor chamber 2, the magnetic body 22 and the stator 23 are disposed adjacent to each other. The adjacent magnetic body 22 and the stator 23 connect the rotor 3 to the arrow a in FIG. 2. The drive part which is rotationally driven in one direction shown in FIG. That is, this drive unit generates a rotational torque in the magnetic body 22 by a magnetic action between the stator 23 and the magnetic body 22 by inputting a current to the stator 23 from a power supply unit (not shown). The magnetic body 22, and thus the rotor 3 is driven to rotate by torque.

  In the state where the rotor 3 is disposed in the rotor chamber 2, the rotor chamber in which the protruding end surface of the sliding contact protrusion 8 of the rotor 3 faces the upper surface 3 b of the rotor 3 (the surface constituting one of the thrust surfaces of the rotor 3). In this way, the working fluid in the working chamber 5 is prevented from leaking from between the thrust surface of the rotor 3 and the inner bottom surface 2b of the rotor chamber 2.

  When the rotor 3 housed in the rotor chamber 2 is rotationally driven by the drive unit, each vane 4 receives a centrifugal force generated by the rotation of the rotor 3 and protrudes outward from the outer peripheral surface 3a of the rotor 3. The tip is brought into sliding contact with the inner peripheral surface 2a of the rotor chamber 2, and a plurality of inner surfaces (the inner peripheral surface 2a, the inner bottom surface 2b, etc.) of the rotor chamber 2, the outer peripheral surface 3a of the rotor 3, and the vanes 4 are surrounded. The working chamber 5 is formed in the rotor chamber 2. Since the rotor 3 is in the eccentric position of the rotor chamber 2, the distance between the inner peripheral surface 2 a of the rotor chamber 2 and the outer peripheral surface 3 a of the rotor 3 varies depending on the rotational position of the rotor 3 and the vanes 4 protrude from the rotor 3. The amount also varies depending on the rotational position of the rotor 3, that is, by rotating the rotor 3, each working chamber 5 changes its volume while moving in the rotational direction of the rotor 3. That is, the volume of each working chamber 5 increases as the rotor 3 rotates when it is in a position communicating with the suction port 6, and the volume decreases as the rotor 3 rotates when it is in a position communicating with the discharge port 7. Accordingly, if the rotor 3 is driven to rotate, the working fluid flows from the suction port 6 into the working chamber 5 communicating therewith, and after being compressed in the working chamber 5, is discharged from the discharge port 7. This functions as a pump.

  Here, FIG. 1 is an explanatory view schematically showing a cross section of a portion c of FIG. 4A viewed from the base end direction of the vane 4. As shown in the figure, in the vane pump 1 of this example, fins 25 that are more flexible than the vane 4 on the outer surface (hereinafter referred to as the upper surface of the vane 4) facing the inner bottom surface 2 b of the rotor chamber 2 of the vane 4. Are protruded toward the inner bottom surface 2b of the rotor chamber 2 so that these fins 25 are in sliding contact with the inner bottom surface 2b of the rotor chamber 2 when the rotor 3 is rotationally driven.

  More specifically, a large number of the fins 25 are provided over the entire upper surface of the protrusion 24 provided at the tip of each vane 4. Each fin 25 protrudes in an inclined manner so as to be located on the rear side (the direction indicated by arrow b in FIG. 2) in the rotation direction of the rotor 3 toward the tip side, and is directed from the front side to the rear side in the rotation direction of the rotor 3. It has sex. The tips of the fins 25 are always in sliding contact with the inner bottom surface 2b of the rotor chamber 2 when the rotor 3 is driven to rotate, whereby the rotor chambers 2 are opposed to the upper surfaces of the protrusions 24 by the fins 25. The portion over the entire area between the inner bottom surface 2 b of the rotor is sealed to prevent the working fluid from moving between the adjacent working chambers 5 in the rotation direction of the rotor 3.

  Thus, the fin 25 which has flexibility which protrudes toward the inner bottom surface 2 b of the rotor chamber 2 is provided on the upper surface of the vane 4, and the fin 25 is slid on the inner bottom surface 2 b of the rotor chamber 2 when the rotor 3 is driven to rotate. The contact between the inner bottom surface 2 b of the rotor chamber 2 and the upper surface of the vane 4 is sealed by the fins 25, and the working fluid in the working chamber 5 flows between the inner bottom surface 2 b of the rotor chamber 2 and the upper surface of the vane 4. It is possible to prevent leakage from between. In this case, since the fin 25 slidably contacting the inner bottom surface 2b of the rotor chamber 2 has flexibility, the sliding resistance of the fin 25 with respect to the inner bottom surface 2b of the rotor chamber 2 can be reduced, and the rotational speed of the rotor 3 can be reduced. Can improve pump efficiency. Further, in this example, the working fluid can be prevented from entering between the thrust surface of the rotor 3 and the inner bottom surface 2b of the rotor chamber 2 from between the inner bottom surface 2b of the rotor chamber 2 and the upper surface of each vane 4. In this case, since the sliding resistance of the fins 25 with respect to the inner bottom surface 2b of the rotor chamber 2 can be reduced, the movement of the vanes 4 in the radial direction of the rotor 3 can be performed without any trouble. Further, each fin 25 provided on the upper surface of the vane 4 is inclined so as to be located on the rear side in the rotational direction of the rotor 3 toward the tip side, so that each fin 25 slides on the inner bottom surface 2b of the rotor chamber 2. The resistance can be further reduced, and the pump efficiency can be further improved.

  In the example of FIG. 1, the fins 25 are provided on the upper surface of the vane 4, but the fins 25 may be provided on the inner bottom surface 2 b of the rotor chamber 2 as shown in FIG. 5. In FIG. 5, a large number of fins 25 are provided in a range extending over the entire length of the outer peripheral end, which is a portion of the inner bottom surface 2 b of the rotor chamber 2 facing the upper surface of the protrusion 24 provided at the tip of the rotor 3. Each fin 25 is inclined so as to be located on the front side in the rotation direction of the rotor 3 (the direction indicated by the arrow a in FIGS. 2 and 5) toward the tip side, and the direction from the rear side to the front side in the rotation direction of the rotor 3. It has sex. The tip of each fin 25 is always in sliding contact with the upper surface of the protrusion 24 provided at the tip of each vane 4 when the rotor 3 is rotationally driven. The portion between the upper surface of 24 and the inner bottom surface 2 b of the rotor chamber 2 facing this is sealed to prevent the working fluid from moving between the adjacent working chambers 5 in the rotation direction of the rotor 3.

  In this way, the flexible fin 25 protrudes from the inner bottom surface 2 b of the rotor chamber 2 toward the upper surface side of the vane 4, and the fin 25 is in sliding contact with the upper surface of each vane 4 when the rotor 3 is driven to rotate. By doing so, the gap between the upper surface of the vane 4 and the inner bottom surface 2 b of the rotor chamber 2 is sealed by the fin 25, and the working fluid in the working chamber 5 is between the outer surface of the vane 4 and the inner bottom surface 2 b of the rotor chamber 2. Can be prevented from leaking out. In this case, since the fin 25 slidably contacting the inner bottom surface 2b of the rotor chamber 2 has flexibility, the sliding resistance of the fin 25 with respect to the inner bottom surface 2b of the rotor chamber 2 can be reduced, and the rotational speed of the rotor 3 can be reduced. Can improve pump efficiency. Further, in this example, a flexible fin 25 is provided on the inner bottom surface 2b of the rotor chamber 2 facing the thrust surface of the rotor 3, and the fin 25 is slidably contacted with the upper surface of each facing vane 4. It is also possible to prevent the working fluid from entering between the vane 4 and the inner bottom surface 2b of the rotor chamber 2 between the rotor 3 and the inner bottom surface 2b of the rotor chamber 2. In this case, since the sliding resistance of the fins 25 with respect to the vanes 4 can be reduced, the movement of the vanes 4 in the radial direction of the rotor 3 can be performed without any problem. Further, since each fin 25 provided on the inner bottom surface 2b of the rotor chamber 2 is inclined toward the front side in the rotational direction of the rotor 3 toward the tip side, the sliding resistance of the fin 25 with respect to the upper surface of the vane 4 Can be further reduced, and the pump efficiency can be further improved.

  In each of the above examples, the fin 25 is provided only on the upper surface of the vane 4 facing the inner bottom surface 2b of the rotor chamber 2 or only on the inner bottom surface 2b of the rotor chamber 2. However, the upper surface of the vane 4 and the rotor are shown. The fins 25 may be provided on both the inner bottom surface 2 b of the chamber 2, that is, in the present invention, the inner bottom surface 2 b of the rotor chamber 2 facing the thrust surface of the rotor 3 and the inside of the rotor chamber 2 of the vane 4. A fin 25 protruding toward the other surface is provided on at least one surface of the upper surface facing the bottom surface 2b, and the fin 25 may be brought into sliding contact with the other surface when the rotor 3 is driven to rotate. . Further, in each of the above examples, the vane 4 protrudes outward by the centrifugal force when the rotor 3 is rotationally driven, but the spring material 26 (see FIG. 5) that urges the vane 4 outward in the vane groove 19. 6), the tip of the vane 4 may be brought into sliding contact with the inner peripheral surface 2a of the rotor chamber 2 without depending on the rotational speed of the rotor 3. Further, in each of the above examples, the rotor 3 is pivotally supported with respect to the fixed shaft 20, but instead of the fixed shaft 20, a rotation shaft fixed to the rotor 3 can be rotated with respect to the rotor chamber 2. A structure that is pivotally supported may be employed. In each of the above examples, the drive unit that rotationally drives the rotor 3 is configured by the stator 23 and the magnetic body 22 that generate magnetic action. As the drive unit, a shaft fixed to the rotor 3 is rotated by a motor. You may employ | adopt the structure to drive.

It is a schematic diagram which shows an example of embodiment of this invention and shows the cross section of the c section of Fig.4 (a) seen from the base end direction of the vane. It is a horizontal sectional view of a vane pump same as the above. It is a disassembled perspective view of a vane pump same as the above. (A) is AA sectional drawing of FIG. 2, (b) is BB sectional drawing of FIG. It is a schematic diagram which shows the other example of embodiment of this invention and shows the cross section of the c section of Fig.4 (a) seen from the base end direction of the vane. It is sectional drawing of the conventional vane pump.

Explanation of symbols

1 Vane Pump 2 Rotor Chamber 3 Rotor 4 Vane 5 Actuation Chamber 6 Suction Port 7 Discharge Port 25 Fin

Claims (3)

  Surrounded by a rotor chamber, a rotor housed in the rotor chamber, a plurality of vanes provided on the rotor and having tips slidably contacted with an inner peripheral surface of the rotor chamber, an inner surface of the rotor chamber, an outer peripheral surface of the rotor, and the vanes A working chamber that changes its volume by rotating the rotor, a suction port that allows the working fluid to flow into the working chamber in the volume expansion process, and a discharge port that discharges the working fluid from the working chamber in the volume reduction process, Of the inner bottom surface of the rotor chamber facing the thrust surface of the rotor and the outer surface facing the inner bottom surface of the rotor chamber of the vane, at least one surface has a flexible fin protruding toward the other surface side. A vane pump comprising: the fin being slidably brought into contact with the other surface when the rotor is driven to rotate.   The fins are provided on the outer surface opposite to the inner bottom surface of the rotor chamber of the vane, and the fins are brought into sliding contact with the inner bottom surface of the rotor chamber when the rotor is driven to rotate, so that the fins are directed toward the tip side in the rotation direction of the rotor. 2. The vane pump according to claim 1, wherein the vane pump is inclined so as to be located on the rear side.   The fin is provided on the inner bottom surface of the rotor chamber, and the fin is slidably contacted with an outer surface facing the inner bottom surface of the rotor chamber of the vane when the rotor is driven to rotate, and the fin is directed toward the tip in the rotational direction of the rotor. 2. The vane pump according to claim 1, wherein the vane pump is inclined so as to be located on the front side.

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