JP6321338B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device.

  A pump device that pumps the liquid stored in the underground tank and pumps it to the nozzle is mounted in the housing of the fuel supply device. Each device such as a strainer, a check valve, a pump, an air separation chamber, a gas-liquid separation chamber, and a float valve is accommodated in the casing of the pump device. Further, the pump includes a pump chamber, an outer rotor that is rotationally driven by a rotor shaft connected to a motor, and an inner rotor that is rotatably supported by a rotating shaft that is eccentric with the outer rotor (for example, Patent Documents). 1). Further, in the pump chamber, liquid is sucked into the pump chamber by meshing with the plurality of inner teeth of the rotating outer rotor and the outer teeth of the inner rotor, and the liquid in the pump chamber is rotated by rotation of the outer rotor and inner rotor. Is discharged from the discharge port.

  The pump chamber is defined by a cylindrical inner wall formed in the casing and a lid member that closes the opening of the pump chamber. And on the inner side of the lid member, a rotating shaft that fits into the center hole of the rotating member, a partition portion that the outer periphery of the rotating member is in sliding contact, a suction portion that communicates with the suction port, a discharge portion that communicates with the discharge port, etc. Is provided.

JP-A-9-324766

  In the pump chamber of the pump device, the liquid is sucked into the pump chamber by the suction port pressure (negative pressure) generated by the rotation of the outer rotor and the inner rotor, and the liquid is discharged by the discharge port pressure (positive pressure). At that time, since the pressure of the suction port (negative pressure) and the pressure of the discharge port (positive pressure) act on the outer rotor and the inner rotor, the outer rotor moves against the inner wall of the pump chamber by the pressure difference at that time. A force that is pressed to the inlet side works.

  The outer rotor is connected to the rotor shaft that is rotationally driven by the motor, and is supported on the casing side. Therefore, when the pressure difference increases, the outer rotor is in the radial direction (suction direction) with respect to the partition provided inside the lid member. To the side). Further, when the clearance from the pump chamber is large due to a processing error when processing the outer rotor, the displacement of the outer rotor becomes larger.

  When the outer rotor rotates in a state shifted to the suction side as described above, there is a problem that the inner teeth of the outer rotor come into contact with the outer peripheral surface of the partition portion and the sliding resistance increases.

  Further, when the sliding resistance of the outer rotor increases, the load applied to the motor increases, and as a result, there arises a problem that the discharge capacity of the pump device decreases.

  In view of the above circumstances, an object of the present invention is to provide a pump device that solves the above problems.

  In order to solve the above problems, the present invention has the following means.

The present invention
A pump chamber having a cylindrical inner wall formed in the casing;
A suction port communicated with the upstream flow path of the pump chamber;
A discharge port communicated with the downstream flow path of the pump chamber;
An outer rotor whose outer periphery rotates along the inner wall of the pump chamber, and which has a plurality of inner teeth on the inner periphery;
An inner rotor having outer teeth that are rotatably supported in the pump chamber by a rotating shaft that is eccentric with respect to the rotation center of the outer rotor, and that protrude to the outer periphery so as to mesh with the inner teeth;
It has an outer peripheral surface with which the inner teeth of the outer rotor generated in accordance with the amount of eccentricity between the outer rotor and the inner rotor are in sliding contact, and an inner peripheral surface with which outer teeth of the inner rotor are in sliding contact with the end on the discharge port side. A partition,
A rotor shaft that transmits the rotation of the motor to the outer rotor;
A pump device comprising:
The outer peripheral surface of the partition has a suction side outer peripheral surface relatively close to the suction port and a discharge side outer peripheral surface relatively close to the discharge port in the rotation direction of the outer rotor,
At least two or more adjacent inner teeth of the inner teeth of the outer rotor facing the suction side outer peripheral surface are in sliding contact with the suction side outer peripheral surface,
Wherein the discharge side outer peripheral surface, the located inside the rotation locus of the internal teeth of the outer rotor, at least two internal teeth of the internal teeth of the outer rotor opposite to the discharge side outer circumferential surface the non-contact portion is formed to be a non-contact further characterized by obtaining Bei.

  According to the present invention, even when the outer rotor is displaced to the suction port side due to the pressure difference between the suction port and the discharge port, the inner teeth of the outer rotor do not contact the outer peripheral surface of the partition portion, and the sliding resistance during rotational driving Can be suppressed, the load on the motor can be reduced, and the pump capacity can be prevented from lowering.

1 is a schematic configuration diagram schematically showing a pump unit to which an embodiment of a pump device according to the present invention is applied. It is a figure which shows the flow of the liquid in a pump unit in order. It is a disassembled perspective view which shows each member of a pump apparatus. It is a perspective view which expands and shows the structure inside a cover member. It is a longitudinal cross-sectional view which shows the internal structure of a pump apparatus. It is a figure which expands and shows the rotor and pinion of a pump apparatus. It is a longitudinal cross-sectional view which follows the AA line in FIG. It is a front view which shows the structure inside the cover member of a pump chamber. It is a figure which shows the relationship between a partition part, a rotor, and a pinion.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

Embodiment 1
FIG. 1 is a schematic configuration diagram schematically showing a pump unit to which an embodiment of a pump device according to the present invention is applied. FIG. 2 is a diagram illustrating the flow of liquid in the pump unit in order. In addition, in FIG. 1, in order to show the whole structure of the pump unit in an easy-to-understand manner, each part is described by shifting the vertical position, the front-rear position, and the left-right position, and is described in a place different from the positions shown in FIGS. Has been.

  As shown in FIGS. 1 and 2, the pump unit 10 is mounted on a fuel supply device that supplies liquid fuel (hereinafter referred to as “liquid”) such as gasoline or light oil, and is stored in the underground tank 12. The air bubbles are pumped up, and bubbles contained in the liquid are separated and fed to the flow meter 20. The liquid fuel measured by the flow meter 20 is supplied to the fuel tank of the vehicle through the hose and nozzle of the fuel supply device.

  In the pump unit 10, an inflow chamber 31, a pump chamber 32, an air separation chamber 33, an outflow path 34, and a gas-liquid separation chamber 36 are formed inside the casing 30. The inflow chamber 31 is provided with a strainer mounting chamber 38 communicating with an inflow port 37 that opens to the bottom of the casing 30 and a check valve mounting chamber 39 adjacent to the downstream side (outflow side) of the strainer mounting chamber 38. It has been. The strainer mounting chamber 38 and the check valve mounting chamber 39 are provided adjacent to the same side surface of the casing 30. Further, the outflow side of the strainer mounting chamber 38 and the inflow side of the check valve mounting chamber 39 are communicated with each other by a communication path 45.

  The strainer mounting chamber 38 includes a first opening 38a machined from the side surface of the casing 30, and a strainer receiving portion 38b formed at the back of the opening 38a. A strainer 44 is accommodated in the strainer mounting chamber 38. The strainer 44 is made of a wire mesh that captures foreign substances contained in the liquid flowing in from the inlet 37, and is formed in a cylindrical shape.

  The liquid sucked from the inlet 37 by driving the pump is filtered by the strainer 44, passes through the communication path 45, flows into the check valve mounting chamber 39, and flows out to the suction side flow path 46.

  A pump chamber 32 that constitutes a part of the pump device 48 is provided on the downstream side of the check valve mounting chamber 39, and a suction port that communicates with a suction side flow path (upstream flow path) 46 is provided in the pump chamber 32. 32 a and a discharge port 32 b communicating with the discharge side flow path (downstream flow path) 47 are formed.

  The pump device 48 includes a gear pump, and includes a rotor (outer rotor) 50 that is rotated by transmission of the rotational driving force of the motor, and a pinion (inner rotor) 52 that is rotationally driven by the rotor 50. The pump device 48 sucks and discharges liquid by rotating while the inner teeth 50a of the rotor 50 and the outer teeth 52b of the pinion 52 are engaged with each other.

  In the pump device 48, when the rotor 50 and the pinion 52 are rotationally driven in the counterclockwise direction, the liquid is sucked from the suction-side flow path 46, and between the hollow portions 52a formed between the external teeth 52b of the pinion 52, And flows between the internal teeth 50 a of the rotor 50 and is discharged to the discharge side flow path 47 through the discharge port 32 b of the pump chamber 32.

  Further, the liquid discharged from the pump device 48 flows into the air separation chamber 33 disposed downstream of the discharge side flow path 47. In the air separation chamber 33, the inflowing liquid is divided into a liquid and a gas-enriched liquid, the liquid is supplied to the flow meter 20 through the check valve 64, and the gas-enriched liquid is passed through the gas-enriched liquid inflow hole 58. The gas-liquid separation chamber 36 is supplied. In the gas-liquid separation chamber 36, the gas-enriched liquid is separated into liquid and gas, and the liquid from which the gas has been separated passes through the return hole 60 and is returned to the suction side flow path 46, and the gas passes through the atmosphere opening 62. And discharged to the outside of the pump unit 10.

[Configuration of Pump Device 48]
FIG. 3 is an exploded perspective view showing each member of the pump device. FIG. 4 is an enlarged perspective view showing a configuration inside the lid member. FIG. 5 is a longitudinal sectional view showing the internal configuration of the pump device 48. FIG. 6 is an enlarged view showing the rotor 50 and the pinion 52 of the pump device 48. FIG. 7 is a longitudinal sectional view showing the structure of the pump device 48. In FIG. 6, for the convenience of explanation, the detailed configuration is shown in a simplified manner.

  As shown in FIGS. 3 to 5, the pump device 48 closes the opening 32 c formed in the pump chamber 32 in order to mount the pump chamber 32 and members such as the rotor 50 and the pinion 52 in the pump chamber 32. And a rotor 50 coupled to the rotor shaft 100, a pinion 52, and a rotating shaft 53.

  As shown in FIG. 5, the casing 30 is formed with insertion holes 102 and 104 through which the rotor shaft 100 is inserted. The rotor shaft 100 is inserted into the insertion holes 102 and 104, and one end 100 a is formed in the casing 30. The other end 100b projects outside the casing 30 and is coupled to a pulley 110 to which the rotational driving force of the drive motor is transmitted.

  In the present embodiment, the rotational driving force of the drive motor is configured to be transmitted to the rotor shaft 100 via the pulley 110. However, the transmission of the rotational driving force of the drive motor to the rotor shaft 100 may be transmitted by directly connecting the rotational drive shaft of the drive motor and the rotor shaft 100 without using the pulley 110.

  The rotor shaft 100 is inserted into the insertion holes 102 and 104 from the opening 32 c of the pump chamber 32, so that the rotor 50 is accommodated in the pump chamber 32 of the pump device 48. Then, the pinion 52 and the rotation shaft 53 of the pinion 52 are accommodated in the pump chamber 32 so as to be engaged with the gear of the rotor 50 from the opening 32 c of the pump chamber 32, and the opening 32 c ( The opening 32 c) formed in the pump chamber 32 is closed by attaching the lid member 28 with the attachment bolt 29.

  As shown in FIG. 3, FIG. 4, and FIG. 6, the lid member 28 has a crescent-shaped partition 51 for partitioning between the rotor 50 and the pinion 52, and a rotation that rotatably supports the pinion 52. A shaft 53 is formed.

  As shown in FIGS. 4 and 7, the inner wall 26 that faces the axial end surface 52 c of the pinion 52 protrudes inside the lid member 28. The front side wall surface 26 a of the inner wall 26 faces the axial end surface 52 c of the pinion 52 through a minute clearance 151 with the lid member 28, and the partition portion 51 protrudes laterally.

  Further, the base end of the rotation shaft 53 is fixed to the bearing hole 23 formed in the lid member 28, and the tip end of the rotation shaft 53 protrudes toward the inside of the pump chamber 32 of the casing 30. Thus, the rotating shaft 53 fitted and fixed in the bearing hole 23 of the lid member 28 is fitted in the central through hole on the side surface on the pinion 52 side and rotatably supports the pinion 52.

[Configuration of pump chamber 32]
As shown in FIG. 6, the suction port 32 a of the pump chamber 32 communicates with the suction side flow path (upstream side flow path) 46, and the discharge port 32 b of the pump chamber 32 is connected to the discharge side flow path (downstream side flow path). 47 is communicated.

  Further, a groove that forms an inflow passage is formed as a suction portion 28a on the left side of the inner wall 26, and a groove that forms an outflow passage is formed as a discharge portion 28b on the right side of the inner wall 26. The suction portion 28a and the discharge portion 28b are recessed from the front side wall surface 26a of the inner wall 26, and are defined by side walls 26b and 26c that are curved in a U shape of the inner wall 26 and side walls 26d and 26e that extend in the radial direction. Yes. The suction portion 28a and the discharge portion 28b open to the outside of the pump chamber 32 through the suction port 32a and the discharge port 32b of the pump chamber 32, respectively.

[Configuration of Rotor 50 and Pinion 52]
As shown in FIG. 6, in the pump device 48, by the rotation of the rotor 50 and the pinion 52, the liquid is sucked into the suction portion 28 a of the lid member 28 through the suction port 32 a of the casing 30. The liquid is discharged to the discharge port 32b of the casing 30 through the 28 discharge portions 28b.

  The rotor 50 is formed in a disk shape corresponding to the inner diameter of the pump chamber 32, and a plurality of semicircular internal teeth 50a are arranged on the disk-shaped plane at a predetermined pitch (interval) in the rotation direction (circumferential direction). One is provided. The pinion 52 is rotatably supported by a rotary shaft 53, and a plurality of semicircular recess portions 52a corresponding to the respective internal teeth 50a of the rotor 50 are provided on the outer periphery at a predetermined pitch (interval). It has been.

  Further, the rotation center of the rotor 50 and the rotation center of the pinion 52 are eccentric in the vertical direction. Between the outer periphery of the pinion 52 and the inner periphery of the rotor 50, a crescent-shaped partition portion 51 corresponding to the amount of eccentricity is provided. The inner peripheral surface 51 a of the partition 51 is a pinion sliding contact surface on which the outer periphery of the pinion 52 is in sliding contact, and a suction-side outer peripheral surface 51 b and a discharge-side outer peripheral surface 51 c are formed on the outer periphery of the partition 51.

  During the pump operation, the inner teeth 50a of the rotor 50 are engaged with the recesses 52a of the pinion 52, so that the rotor 50 is rotated counterclockwise by the motor and the pinion 52 is also rotated in the same direction. Pressure (negative pressure and discharge pressure) is generated on the suction port 32a side and the discharge port 32b side, respectively. Then, when negative pressure is generated on the suction port 32 a side of the pump chamber 32, the inflow check valve 40 (see FIG. 1) is opened, and the liquid that has passed through the strainer 44 is sucked into the suction port 32 a of the pump chamber 32. It is. Thereafter, the liquid flows into the recess 52a of the pinion 52 and is discharged to the discharge port 32b by the pressure (discharge pressure) on the discharge side.

  FIG. 8 is a front view showing a configuration inside the lid member 28 of the pump chamber. As shown in FIG. 8, the partition portion 51 stands on the pulley 110 side (Xb direction) with respect to the axial direction from the front side wall surface 26 a of the inner wall 26 of the lid member 28, and is integrally formed with the lid member 28. Yes. The partition 51 includes an inner peripheral surface 51a in which the outermost peripheral end surface of the outer teeth 52b of the pinion 52 is in sliding contact, an inner peripheral end surface 51b in which the innermost peripheral end surface of the inner teeth 50a of the rotor 50 is in sliding contact, and the rotor 50 It has the discharge side outer peripheral surface 51c which has the non-contact part which the innermost peripheral end surface of the internal tooth 50a does not contact.

  The suction side outer peripheral surface 51b is formed on the outer periphery of the partition portion 51 on the suction port 32a side, and is formed with a radius of curvature substantially the same as the rotation locus of the innermost peripheral end surface of the inner teeth 50a when the rotor 50 rotates. Yes. In addition, at least two of the internal teeth 50a provided on the rotor 50 are in contact with the suction side outer peripheral surface 51b, and the sealing performance with the partition portion 51 is ensured. . That is, when the outer rotor 50 rotates, at least two adjacent inner teeth 50a out of the inner teeth 50a of the outer rotor 50 are always in contact with the suction side outer peripheral surface 51b of the partition portion 51. The sealability between the gaps between the outer rotor 50 and the partition 51 is maintained.

  The discharge-side outer peripheral surface 51c is formed on the outer periphery of the partition portion 51 on the discharge port 32b side, and a rotation trajectory when the innermost peripheral end surface of the inner teeth 50a of the rotor 50 rotates (shown by broken lines in FIG. 8). It is formed so as to be located on the inner side (rotation shaft 53 side). Therefore, each internal tooth 50a of the rotor 50 is opposed to the discharge-side outer peripheral surface 51c with a small gap S, and therefore passes outside the discharge-side outer peripheral surface 51c. The gap S has a maximum value at the intermediate portion of the discharge-side outer peripheral surface 51c, and gradually decreases as it approaches both ends of the discharge-side outer peripheral surface 51c.

  As shown in FIG. 8, for example, when the radius of curvature R2 of the discharge-side outer peripheral surface 51c and the radius of curvature R1 of the suction-side outer peripheral surface 51b are compared at the same center point (for example, the center of the rotating shaft), the discharge-side outer peripheral surface The radius of curvature R2 of 51c is smaller (R1> R2). The width (thickness) between the discharge-side outer peripheral surface 51c and the inner peripheral surface 51a is narrower (thinner) than the width (thickness) between the suction-side outer peripheral surface 51b and the inner peripheral surface 51a.

  Even when the radius of curvature R1 of the suction side outer peripheral surface 51b is smaller than the radius of curvature R2 of the discharge side outer peripheral surface 51c (R1 <R2), the center point of the curvature radius R2 of the discharge side outer peripheral surface 51c is set to the suction side outer periphery. This case can be applied by displacing the center 51 of the curvature radius R1 of the surface 51b. That is, even when R1 <R2, the width (thickness) between the discharge-side outer peripheral surface 51c and the inner peripheral surface 51a is narrower (thinner) than the width (thickness) between the suction-side outer peripheral surface 51b and the inner peripheral surface 51a. Can be formed. In FIG. 8, the gap S is exaggerated for easy understanding of the configuration of the discharge-side outer peripheral surface 51c.

  In FIG. 8, the ratio of the length of the suction-side outer peripheral surface 51b and the discharge-side outer peripheral surface 51c is 1: 1, but is not limited to this, and at least the inner teeth 50a of the outer rotor 50 are adjacent to each other. The matching two inner teeth 50a may always be in contact with the suction side outer peripheral surface 51b of the partition portion 51. For example, the discharge side outer peripheral surface 51c may be longer or smaller than the suction side outer peripheral surface 51b. Of course, it may be.

[Configuration of Rotor 50 and Pinion 52]
As shown in FIG. 6, in the pump device 48, by the rotation of the rotor 50 and the pinion 52, the liquid is sucked into the suction portion 28 a of the lid member 28 through the suction port 32 a of the casing 30. The liquid is discharged to the discharge port 32b of the casing 30 through the 28 discharge portions 28b.

  The rotor 50 is formed in a disk shape corresponding to the inner diameter of the pump chamber 32, and a plurality of semicircular internal teeth 50a are arranged on the disk-shaped plane at a predetermined pitch (interval) in the rotation direction (circumferential direction). One is provided. The pinion 52 is rotatably supported by a rotary shaft 53, and a plurality of semicircular recess portions 52a corresponding to the respective internal teeth 50a of the rotor 50 are provided on the outer periphery at a predetermined pitch (interval). It has been.

  FIG. 9 is a diagram illustrating the relationship among the partition 51, the rotor 50, and the pinion 52. As shown in FIG. 9, during the pump operation, the rotor 50 is caused by the pressure difference between the suction pressure (negative pressure) on the suction port 32a side and the discharge pressure (positive pressure) on the discharge port 32b side that is generated by the rotation of the rotor 50. Is displaced to the suction side. The amount of displacement at this time is determined by the radial clearance between the rotor 50 and the lid member 28 or the clearance with the inner peripheral surface of the pump chamber 32 that rotatably supports the rotor 50. Therefore, the minute gap S formed between each internal tooth 50a of the rotor 50 and the discharge-side outer peripheral surface 51c is set to be equal to or larger than the displacement amount of the rotor 50.

  However, the discharge-side outer peripheral surface 51c is formed on the inner side of a rotation locus (indicated by a broken line in FIG. 8) when the innermost peripheral end surface of the inner teeth 50a of the rotor 50 rotates. Therefore, even when the rotor 50 is displaced to the suction side due to the pressure difference, an increase in sliding resistance between the inner teeth 50a of the rotor 50 and the discharge-side outer peripheral surface 51c of the partition portion 51 is alleviated, and the rotor rotation drive by the motor is reduced. It is possible to suppress an increase in load and prevent a decrease in pump capacity.

DESCRIPTION OF SYMBOLS 10 Pump unit 23 Bearing hole 24 Annular recessed part 26 Inner wall 26a Front side end surface 28 Lid member 28a Suction part 28b Discharge part 30 Casing 31 Inflow chamber 32 Pump chamber 32a Suction port 32b Discharge port 33 Air separation chamber 34 Outflow path 36 Gas-liquid separation chamber 37 Inlet 40 Inlet check valve 44 Strainer 46 Suction side channel 47 Discharge side channel 48 Pump device 50 Rotor 50a Inner teeth 51 Partition 51a Inner peripheral surface 51b Suction side outer peripheral surface 51c Discharge side outer peripheral surface 52 Pinion 52a Dimple Part 52b external teeth 53 rotating shaft 100 rotor shaft

Claims (2)

A pump chamber having a cylindrical inner wall formed in the casing;
A suction port communicated with the upstream flow path of the pump chamber;
A discharge port communicated with the downstream flow path of the pump chamber;
An outer rotor whose outer periphery rotates along the inner wall of the pump chamber, and which has a plurality of inner teeth on the inner periphery;
An inner rotor having outer teeth that are rotatably supported in the pump chamber by a rotating shaft that is eccentric with respect to the rotation center of the outer rotor, and that protrude to the outer periphery so as to mesh with the inner teeth;
It has an outer peripheral surface with which the inner teeth of the outer rotor generated in accordance with the amount of eccentricity between the outer rotor and the inner rotor are in sliding contact, and an inner peripheral surface with which outer teeth of the inner rotor are in sliding contact with the end on the discharge port side. A partition,
A rotor shaft that transmits the rotation of the motor to the outer rotor;
A pump device comprising:
The outer peripheral surface of the partition has a suction side outer peripheral surface relatively close to the suction port and a discharge side outer peripheral surface relatively close to the discharge port in the rotation direction of the outer rotor,
At least two or more adjacent inner teeth of the inner teeth of the outer rotor facing the suction side outer peripheral surface are in sliding contact with the suction side outer peripheral surface,
Wherein the discharge side outer peripheral surface, the located inside the rotation locus of the internal teeth of the outer rotor, at least two internal teeth of the internal teeth of the outer rotor opposite to the discharge side outer circumferential surface the non-contact portion is formed to be a non-contact further pump apparatus characterized by obtaining Bei. In the rotation direction of the outer rotor, an end portion on the suction port side of the non-contact portion is provided closer to the suction port side than an end portion on the discharge port side of the partition portion. Item 2. The pump device according to Item 1.

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