JP2010048182A - Vane pump - Google Patents

Abstract

In a vane pump, when a rotor is driven, wear of the vane and the vane slit is suppressed even when a high pressure is applied to the vane and the rotor.
A vane pump (1) slides in a rotor chamber (20), a rotor (3) housed in a rotor chamber (29), a plurality of vane slits (30) formed in a radial direction of the rotor (3), and a plurality of vane slits (30). The vane 4 is provided freely and has a tip slidably contacted with the inner peripheral surface of the rotor chamber 20. The vane 4 is first in the corner of the vane 4 at the front end in the rotation direction of the rotor 2. The reinforcing member 8a is provided, and the vane slit 30 is provided with the second reinforcing member 8b at the corner portion on the rear side in the rotational direction of the rotor 3 and outside in the radial direction. The corners of the vane 4 and the vane slit 30 are loaded with high pressure when the rotor is driven, but are not easily worn because the first reinforcing member 8a and the second reinforcing member 8b are provided.
[Selection] Figure 2

Description

  The present invention relates to a vane pump that changes the volume of a pump chamber surrounded by an inner peripheral surface of a rotor chamber, an outer peripheral surface of a rotor, and a plurality of vanes, and sucks and discharges working fluid such as water.

  The vane pump includes a rotor chamber, a rotor that rotates eccentrically in the rotor chamber, and a plurality of vanes that are slidably provided in slits formed in a radial direction of the rotor. The working fluid such as water sucked into the rotor chamber is compressed by changing the volume of the space (pump chamber) partitioned by the outer peripheral surface and the vanes with the rotation of the rotor, and the compressed working fluid Is discharged out of the rotor chamber (see, for example, Patent Document 1).

  A cross-sectional configuration of a general vane pump is shown in FIGS. The vane pump 101 includes a casing 121 having a rotor chamber 120, a rotor 103 accommodated in the rotor chamber 120, a plurality of vane slits 130 formed in the radial direction of the rotor 103, and the plurality of vane slits 130. The vane 104 is provided so as to be slidable and the tip thereof is slidably contacted with the inner peripheral surface 120 a of the rotor chamber 120, the suction port 105 for sucking the working fluid into the rotor chamber 120, and the working fluid is discharged from the rotor chamber 120. And a discharge port 106.

  Since the rotor 103 is housed in the rotor chamber 120 with a rotating shaft 127 provided at an eccentric position of the rotor chamber 120 as a bearing, depending on the rotation position of the rotor 103, the inner peripheral surface 120a of the rotor chamber 120 and the rotor 103 The distance from the outer peripheral surface 103a is different. Therefore, when the rotor 103 is driven to rotate, the volume of the pump chamber 107 that is surrounded by the inner peripheral surface 120a of the rotor chamber 120, the outer peripheral surface 103a of the rotor 103, and the plurality of vanes 104 moves while changing in size. As a result, the working fluid sucked into the rotor chamber 120 from the suction port 105 is discharged from the discharge port 106.

In general, if the vane 104 is wide (in the direction perpendicular to the radial direction of the rotor 103), the tip of the vane 104 is difficult to slidably contact the inner peripheral surface of the rotor chamber 120. And a front end of the 120a vane 104 are likely to be formed. If it becomes so, the compressive force with respect to the working fluid suck | inhaled in the rotor chamber 120 will become weak, and the function as a pump which discharges working fluid out of the rotor chamber 120 will fall. In addition, the vane 104 has a predetermined length (in the radial direction of the rotor 103), depending on the eccentric position of the rotating shaft 127, so that the tip of each vane 104 is always in sliding contact with the inner peripheral surface of the rotor chamber 120. Need to have a length of Therefore, in the general vane pump 101, the vane 104 is formed in a long and narrow shape in the radial direction of the rotor 103 when viewed from the thrust direction of the rotor 103.
JP 2004-76745 A

  However, in this type of vane pump 101, when the working fluid sucked into the pump chamber 107 is compressed by the eccentric rotation of the rotor 103, a high pressure is applied to each of the rotor chamber 120, the rotor 103, and the vane 104. In particular, the general vane 104 is a member that is long and thin in the radial direction of the rotor 103 as described above, and thus is easily damaged when a high pressure is applied.

  Further, as shown in FIG. 7, there is a slight gap between the vane 104 and the vane slit 130 so that the vane 104 can slide in the vane slit 130. When the rotor 103 is driven, the tip portion of the vane 104 moves while being in sliding contact with the inner peripheral surface 120 a of the rotor chamber 120. At this time, due to the frictional force between the tip of the vane 104 and the inner peripheral surface 120a of the rotor chamber 120, a force (moment) in the rearward direction of the rotor 103 is generated at the tip of the vane 104. For this reason, the corners of the vane 104 and the vane slit 130 are locally in line contact with the opposite side surfaces, and each is easily worn. When the vane 104 and the vane slit 130 are worn, the vane 104 cannot slide smoothly in the vane slit 130, and there is a possibility that the pump function is deteriorated.

  The present invention solves the above problems, and even when a high pressure is applied to the vane and the rotor when the rotor is driven, wear of the vane and the vane slit is suppressed, and the working fluid can be sucked and discharged stably. An object is to provide a vane pump.

  In order to solve the above problems, the invention of claim 1 is directed to a rotor chamber, a rotor housed in the rotor chamber, a plurality of vane slits formed in a radial direction of the rotor, and the plurality of vane slits. A vane whose tip is slidably contacted with the inner peripheral surface of the rotor chamber, a suction port for sucking the working fluid into the rotor chamber, and a discharge port for discharging the working fluid to the outside of the rotor chamber And suctioning from the suction port into the rotor chamber by changing the volume of the space surrounded by the inner peripheral surface of the rotor chamber, the outer peripheral surface of the rotor, and the vane as the rotor rotates. In the vane pump that discharges the working fluid that has been discharged from the discharge port, the vane is provided in front of the rotor in the rotation direction, and a first reinforcing member is provided at a corner on the base end side of the vane. Lit are those in which the second reinforcing member is provided a rotation direction rear side of the rotor to the corners of the radial outer side.

  According to a second aspect of the present invention, in the vane pump according to the first aspect, the first reinforcing member is formed of a material having a strength higher than that of the constituent material of the vane slit, and the second reinforcing member is formed of the vane. It is formed from a material having higher strength than the constituent materials.

  Invention of Claim 3 is the vane pump of Claim 1 or Claim 2, The said vane slit is equipped with the slit block which slidably installs the said vane in the radial direction of the said rotor, The said vane slit and the said An elastic body is filled between the slit blocks.

  According to the first aspect of the present invention, since the first reinforcing member and the second reinforcing member are provided at each corner of the vane and the vane slit, a high pressure is applied to the vane and the rotor when the rotor is driven. It is hard to wear out. Therefore, the vane can slide smoothly in the vane slit, and the vane pump can stably suck and discharge the working fluid.

  According to the second aspect of the present invention, by providing a reinforcing member having higher strength than the opposing contact surface at each corner of the vane and the vane slit to which a particularly large force is applied during rotation of the rotor, The durability of both the vane and the vane slit can be improved.

  According to the invention of claim 3, when the rotor rotates, the slit block moves in the vane slit, so that the force applied to the line contact portion such as the corner of the vane and the vane slit can be reduced. In addition, wear of the vane slit can be suppressed.

  A vane pump according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The vane pump 1 of this embodiment includes a casing 2 having a rotor chamber 20, a rotor 3 housed in the rotor chamber 20, a plurality of vane slits 30 formed in the radial direction of the rotor 3, and a plurality of vane slits 30. Each of the vanes 4 is provided so as to be slidable, and the tip of the vane 4 is slidably contacted with the inner peripheral surface 20a of the rotor chamber 20, the suction port 5 for sucking working fluid such as water into the rotor chamber 20, and the outside of the rotor chamber 20 And a discharge port 6 for discharging the working fluid. The vane pump 1 also includes a motor (not shown) as a rotational drive source for the rotor 3 as appropriate. The vane pump 1 changes the volume of a space surrounded by the inner peripheral surface 20a of the rotor chamber 20, the outer peripheral surface 3a of the rotor 3 and the vane 4 (hereinafter referred to as pump chamber 7) as the rotor 3 rotates, The working fluid sucked into the rotor chamber 20 from the suction port 5 is discharged from the discharge port 6. In the following description, it is assumed that the rotor 3 rotates clockwise (in the direction of the white arrow) when viewed from the thrust direction.

  The casing 2 includes a first case 21 and a second case 22 that accommodate the rotor 3 so as to sandwich the rotor 3 from both thrust directions. The first case 21 has a first recess 23 that is recessed from the mating surface with the second case 22, and the second case 22 is a second recess (not shown) that is recessed from the mating surface with the first case 21. )). The first case 21 and the second case 22 have a plurality of holes 24 for fastening fasteners such as screws. That is, the space formed by the respective holes 24 of the first case 21 and the second case 22 being fastened by a fastener and the first concave portion 23 and the second concave portion being opposed to each other is formed in the rotor chamber 20 in which the rotor 3 is accommodated. It becomes.

  The first recess 23 of the first case 21 includes an inner bottom surface 25 and a ring-shaped member 26 having an inner diameter slightly larger than the outer diameter of the rotor 3. The shape of the rotor chamber 20 viewed from the thrust direction is configured to be substantially circular, and this shape is defined by the ring-shaped member 26. The rotor rotating shaft 27 is supported so as not to rotate at the eccentric position of the inner bottom surface 25, and the rotor rotating shaft 27 connects the inner bottom surfaces of the first case 21 and the second case 22. The ring-shaped member 26 is preferably formed with a packing receiving portion 26 a that receives packing for improving the adhesion between the first case 21 and the second case 22.

  Similar to the first recess 23, the second recess of the second case 22 includes an inner bottom surface and a ring-shaped member (not shown). The ring-shaped member of the second recess has an inner diameter slightly larger than the outer diameter of the ring-shaped member 26 of the first recess 23 so as to be fitted with the ring-shaped member 26 of the first recess 23. The suction port 5 for sucking the working fluid into the rotor chamber 20 and the discharge port 6 for discharging the working fluid to the outside of the rotor chamber 20 are formed so as to penetrate the side portions of the second case 22, respectively. Each is communicated with the rotor chamber 20 through the formed through hole 26b.

  The rotor 3 is formed as a circular body in plan view, and a bearing portion 31 is provided at the center of rotation. A rotor rotating shaft 27 supported by the inner bottom surface 25 of the rotor chamber 20 is inserted into the bearing portion 31. As a result, the outer peripheral surface 3a of the rotor 3 faces the inner peripheral surface 20a of the rotor chamber 20, and the thrust surface of the rotor 3 faces the inner bottom surface 25 of the first recess 23 or the inner bottom surface of the second recess, respectively. . 1 and 2 show only the thrust surface 32 of the rotor 3 that faces the inner bottom surface of the second case 22.

  The plurality of vane slits 30 are formed radially from the outer edge portion of the thrust surface 32 to the outer peripheral surface 3a. Here, a configuration in which four vane slits 30 are formed at positions where the rotor 3 is divided into four parts is shown. The vane 4 is inserted into each vane slit 30, and preferably, an elastic material (not shown) such as a spring or rubber for allowing the vane 4 to slide in the vane slit 30 is provided. By providing this elastic material, the tip of the vane 4 can be brought into sliding contact with the inner peripheral surface 20a of the rotor chamber 20 with certainty.

  The vane 4 has such a size that a slight gap can be formed between the vane slit 30 and the vane slit 30 so that the vane 4 can slide in the vane slit 30. The length in the direction is slightly longer. These vanes 4 are in contact with the inner peripheral surface 20a of the rotor chamber 20 at the tip portion, and partition the space formed by the inner peripheral surface 20a of the rotor chamber 20 and the outer peripheral surface 3a of the rotor 3, thereby Form.

  Note that an electromagnetic induction type DC motor is preferably used as a motor serving as a rotational drive source of the rotor 3. In the electromagnetic induction type DC motor, for example, a first case 21 includes a coil and a yoke that accommodates the coil, a magnet is embedded in the lower portion of the rotor 3, and a magnetic field generated by passing a current through the coil. And a rotational driving force is generated by the magnetic force of the magnet.

  When the rotor 3 housed in the rotor chamber 20 is driven to rotate, the rotation axis of the rotor 3 is in the eccentric position of the rotor chamber 20, so the distance between the inner peripheral surface 20 a of the rotor chamber 20 and the outer peripheral surface 3 a of the rotor 3 is The amount of protrusion of the vane 4 from the outer peripheral surface 3a of the rotor 3 also changes according to the change in the distance. That is, the pump chamber 7 formed by the inner peripheral surface 20 a of the rotor chamber 20, the outer peripheral surface 3 a of the rotor 3, and the vane 4 moves while changing the volume of each in accordance with the rotation of the rotor 3. Therefore, when the rotor 3 is driven to rotate, the working fluid flows from the suction port 5 into the pump chamber 7 communicating therewith, and after being compressed, is discharged from the discharge port 6. Thereby, the vane pump 1 functions as a pump.

  Here, more specific configurations of the vane 4 and the vane slit 30 in the present embodiment will be described with reference to FIG. 3 in addition to FIG. 2 described above. In the vane pump 1 of the present embodiment, the vane 4 is provided with a first reinforcing member 8 a at a corner on the proximal end side of the vane 4 in front of the rotor 3 in the rotation direction. Further, the vane slit 30 is provided with a second reinforcing member 8b at a corner on the rear side in the rotational direction of the rotor 3 and outside in the radial direction. The first reinforcing member 8a and the second reinforcing member 8b are made of a polyphenylene sulfide resin (PPS) filled with carbon fiber to improve the strength (PPSCF), stainless steel (SUS), or the like. It is done.

  As described above, the vane 4 and the vane slit 30 are not strictly sealed so that the vane 4 is slidable in the vane slit 30, and a slight gap exists. Further, when the rotor 3 is driven, the tip of the vane 4 moves while being in sliding contact with the inner peripheral surface 20 a of the rotor chamber 20. At this time, due to the frictional force between the tip of the vane 4 and the inner peripheral surface 20a of the rotor chamber 20, a force (moment) in the rotational direction rearward of the rotor 3 is generated at the tip of the vane 4. Therefore, the corners of the vane 4 and the vane slit 30 are in line contact with the opposite side surfaces, and a particularly large force is applied. However, since the first reinforcing member 8a and the second reinforcing member 8a are provided at the corners of the vane 4 and the vane slit 30 described above, a high pressure is applied to the vane 4 and the rotor 3 when the rotor is driven. Hard to wear out. As a result, the durability of the vane 4 and the vane slit 30 is improved, so that the vane 4 can slide smoothly in the vane slit 130, and the vane pump 1 can stably suck and discharge the working fluid.

  In addition, if a high intensity | strength material is used for the constituent material of the rotor 3 containing the vane 4 and the vane slit 30, each durability can be improved, without using a reinforcement member. However, the high-strength material may increase the cost and increase the weight of the vane pump 1. Further, if a high-strength material is used for only one of the vane 4 and the rotor 3, the other that does not use the high-strength material is likely to be worn. On the other hand, in the vane pump 1 of the present embodiment, the reinforcing members 8a and 8b are provided at the corners of the vane 4 and the vane slit 30 to which particularly large force is applied, so that the vane 4 and the vane slit 30 are efficiently provided. Both durability can be improved.

  Preferably, the first reinforcing member 8 a is formed from a material having higher strength than the constituent material of the vane slit 30, and the second reinforcing member 8 b is formed from a material having higher strength than the constituent material of the vane 4. For example, when the constituent material of the rotor 3 and the vane 4 including the vane slit 30 is PPS, PPSCF is used for the reinforcing members 8a and 8b, and when the constituent material of the rotor 3 and the vane 4 including the vane slit 30 is PPSCF, SUS is used for the reinforcing members 8a and 8b. In this way, by providing reinforcing members having higher strength than the opposing contact surfaces at the corners of the vane 4 and the vane slit 30 to which particularly large force is applied, the vane 4 and the vane slit 30 can be more efficiently provided. Both durability can be improved.

  As a modification of the present embodiment, an elastic body such as rubber or elastomer may be used as a constituent material of the first reinforcing member 8a and the second reinforcing member 8b. If an elastic body is used for the reinforcing members 8a and 8b, the corners of the vane 4 and the vane slit 30 are deformed and brought into surface contact when the rotor 3 rotates. Therefore, the force applied to the corners can be dispersed more than in the case of line contact, and their wear can be suppressed.

Next, a vane pump according to a second embodiment of the present invention will be described with reference to FIG. The vane pump 1 of the present embodiment includes a slit block 8c in which the vane 4 is slidably mounted in the radial direction of the rotor 3 in the vane slit 30, and an elastic body is provided between the vane slit 30 and the slit block 8c. 8d is filled. The second reinforcing member 8b is provided not on the vane slit 30 but on the slit block 8c.
Other configurations are the same as those of the first embodiment described above. A slight gap exists between the vane 4 and the vane slit 30 so that the vane 4 is slidable in the slit block 8c. In FIG. 4, the gap is slightly exaggerated. .

  According to this configuration, when the rotor 3 rotates, the slit block 8 c moves in the vane slit 30, thereby relieving the force applied to the line contact portions such as the corners of the vane 4 and the vane slit 30 described above. The corners of the vane 4 and the vane slit 30 can be prevented from being worn. Further, even when the rotor 3 rotates in the reverse direction, the force applied to the corners of the vane 4 and the vane slit 30 where the reinforcing member is not provided can be reduced.

  In addition, this invention is not restricted to embodiment mentioned above, A various deformation | transformation is possible. For example, the slit block 8c and the elastic body 8d can be applied to the vane slit 30 in which the second reinforcing member 8b is not provided. Further, by providing the elastic body 8d, it is possible to suppress wear of the corner portion on the base end side of the vane 4 even when the vane 4 is not provided with the first reinforcing member 8a. That is, for example, as long as the vane pump 1 can disassemble each component so that the vane 4 can be removed from the vane slit 30, the slit block 8 c and the elastic body 8 d can be provided as shown in FIG. Can be applied.

The disassembled perspective view of the vane pump which concerns on the 1st Embodiment of this invention. Front sectional drawing of the vane pump. The expanded sectional view which shows the structure of the vane and vane slit in the vane pump. The expanded sectional view which shows the structure of the vane in the vane pump which concerns on the 2nd Embodiment of this invention, a vane slit, a slit block, and an elastic body. The expanded sectional view which shows the structure which applied the slit block and the elastic body to the conventional vane pump. Front sectional drawing of the conventional vane pump. The expanded sectional view which shows the structure of the vane and vane slit in the conventional vane pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vane pump 2 Casing 20 Rotor chamber 3 Rotor 30 Vane slit 4 Vane 5 Suction port 6 Discharge port 7 Space (pump chamber) surrounded by the inner circumferential surface of the rotor chamber, the outer circumferential surface of the rotor, and the vane
8a 1st reinforcement member 8b 2nd reinforcement member 8c Slit block 8d Elastic body

Claims (3)

A rotor chamber, a rotor housed in the rotor chamber, a plurality of vane slits formed in a radial direction of the rotor, and a plurality of vane slits are slidably provided, and a tip is provided in the rotor chamber. A vane that is slidably contacted with an inner peripheral surface; a suction port that sucks the working fluid into the rotor chamber; and a discharge port that discharges the working fluid to the outside of the rotor chamber, the inner peripheral surface of the rotor chamber and the rotor In the vane pump that discharges the working fluid sucked from the suction port into the rotor chamber by changing the volume of the space surrounded by the outer peripheral surface and the vane as the rotor rotates, from the discharge port,
The vane is provided with a first reinforcing member at a corner portion on the base end side of the vane in front of the rotation direction of the rotor,
The vane slit is characterized in that a second reinforcing member is provided at a corner portion on the rear side in the rotational direction of the rotor and radially outside. The first reinforcing member is formed of a material having higher strength than the constituent material of the vane slit,
2. The vane pump according to claim 1, wherein the second reinforcing member is formed of a material having higher strength than a constituent material of the vane. The vane slit includes a slit block that slidably houses the vane in a radial direction of the rotor,
The vane pump according to claim 1 or 2, wherein an elastic body is filled between the vane slit and the slit block.

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