JP2015031265A - Pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump device in which impact of a rotary member on the inner wall of a pump chamber and sliding resistance between the rotary member and the inner wall due to the inclination of the rotary member are softened.SOLUTION: The pump device includes: the pump chamber formed in a casing; a suction port communicating with the upstream side flow passage of the pump chamber; a discharge port communicating with the downstream side flow passage of the pump chamber; the rotary member rotating in the pump chamber; and a rotor shaft which is driven by a motor disposed outside the casing and transmits the rotation of the motor to the rotary member. A relief part for softening a sliding resistance between the inner wall of the pump chamber and the end part of the rotor is provided in at least one of the suction port and the discharge port.

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. The pump includes a pump chamber, a rotating member (rotor and pinion) that is driven to rotate by a rotating shaft connected to the motor, a suction port that sucks liquid into the pump chamber by the rotation of the rotating member, and a pump that rotates by the rotation of the rotating member. A discharge port for discharging the liquid in the chamber (see, for example, Patent Document 1).

  In addition, there are vane pumps and gear pumps as pumps, and both pumps are configured to pressurize the liquid by the rotation of the rotating member and discharge the liquid from the discharge port of the pump chamber. The pump chamber into which the rotating member is inserted is defined by a recess formed in the casing and a lid member that closes the recess. And inside the lid member, a rotating shaft that fits in the center hole of the rotating member, a partition portion (in the case of a gear pump) with which the outer periphery of the rotating member is in sliding contact, a suction portion that communicates with the suction port, and a communication port that communicates with the discharge port The discharge part etc. which are performed are 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 rotating member, 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 rotating member, the rotating member is inclined with respect to the rotating shaft inserted into the pump chamber due to the pressure difference. Will receive a lot of power. Further, the rotation member is inclined with respect to the rotation axis due to a processing error when the rotation member is processed.

  When the rotating member rotates in a tilted state in this manner, the end of the rotating member easily comes into contact with the inner wall (lid member) of the pump chamber, and in particular, the inlet portion of the suction port provided in the lid member or the outlet port of the discharge port The contact pressure at the part increases. Therefore, the conventional pump device has a problem that when the rotating member rotates, the sliding resistance between the inlet portion of the suction port or the outlet portion of the discharge port and the rotating member increases.

  Further, when the inclination of the rotating member is increased, the rotational speed of the rotating member is reduced with an increase in sliding resistance, causing a problem that the discharge capacity of the pump device is reduced.

  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 includes a pump chamber 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;
A rotating member that rotates in the pump chamber;
A rotor shaft that is driven by a motor provided outside the casing and transmits the rotation of the motor to the rotating member;
In a pump device comprising:
An at least one of the suction port and the discharge port is provided with a relief portion for relaxing sliding resistance with the end portion of the rotating member.

  According to the present invention, since at least one of the suction port and the discharge port is provided with a relief at the portion where the end of the rotating member is in sliding contact, the sliding resistance near the suction port or the discharge port is reduced even when the rotating member is inclined. It is possible to mitigate, and it is possible to suppress a decrease in the discharge speed by suppressing a decrease in the rotation speed of the rotating member. Further, since the sliding resistance between the inner wall of the pump chamber and the rotating member is alleviated, it is possible to suppress wear and generation of wear powder at the contact portion.

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 the elements on larger scale which expand and show the B section in FIG. It is a perspective view which shows the structure inside the cover member of a pump chamber. It is the elements on larger scale which expand and show the C section in FIG. It is the elements on larger scale which expand and show the principal part of modification 1. FIG. 12 is a perspective view showing a configuration on the inner side of a lid member of Modification 2. It is a figure which shows the structure of the pinion of the modification 3.

  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. 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 an outer rotor (outer rotor) 50 that is rotated by transmission of the rotational driving force of the motor, and an inner pinion (inner rotor) 52 that is rotationally driven by the rotor 50. In the present embodiment, the rotor 50 and the pinion 52 correspond to the rotating member of the present invention.

  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 the recesses 52 a formed between the external teeth of the pinion 52 and the rotor 50. It flows between the respective engaging portions (internal teeth) 50 a 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.

  Further, the inner wall 26 facing the end surface 52 b of the pinion 52 protrudes inside the lid member 28. The front side wall surface 26a of the inner wall 26 is opposed to the end surface 52b of the pinion 52 through a minute clearance 151 with the lid member 28, and the partition portion 51 protrudes sideways.

  As shown in FIGS. 4 and 7, the base end of the rotating shaft 53 is fixed to a bearing hole 23 formed in the lid member 28, and the tip of the rotating shaft 53 is the pump chamber 32 of the casing 30. Protrudes toward the inside of the. 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 each semicircular engaging portion 50a is arranged at a predetermined pitch (interval) in the rotation direction (circumferential direction) on the disk-shaped plane. A plurality are provided. The pinion 52 is rotatably supported by a rotating shaft 53, and a plurality of semicircular recess portions 52a corresponding to the respective engaging portions 50a of the rotor 50 are provided on the outer periphery at a predetermined pitch (interval). Is provided.

  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 51a of the partition portion 51 is a pinion sliding contact surface on which the outer periphery of the pinion 52 is in sliding contact, and the outer peripheral surface 51b of the partition portion 51 is a rotor sliding contact surface on which each engaging portion 50a of the rotor 50 is in sliding contact. .

  During the pump operation, the engaging portion 50a of the rotor 50 is engaged with each recess 52a of the pinion 52, so that the rotor 50 is driven to rotate counterclockwise by the motor, and the pinion 52 is also driven to rotate in the same direction. Thus, 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.

  During the operation of the pump, the pinion 52 is inclined with respect to the rotation shaft 53 due to 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 pinion 52. . As shown in FIG. 7, a minute clearance 151 is interposed between the end portion 52 b of the pinion 52 and the lid member 28, but the end portion 52 b of the pinion 52 is connected to the lid member 28 due to the inclination of the pinion 52. It becomes easy to touch the inside.

[Configuration of the inside of the lid member 28]
FIG. 8 is a front view showing the configuration inside the lid member of the pump chamber. FIG. 9 is a partially enlarged view showing the portion B in FIG. FIG. 10 is a perspective view showing the configuration inside the lid member of the pump chamber. FIG. 11 is a partially enlarged view showing a C portion in FIG.

  As shown in FIGS. 8 to 11, the cover member 28 is provided with relief portions 27 at corners of the inner wall 26 formed between the partition portion 51 and the suction portion 28 a. That is, the escape portion 27 is an arc-shaped recess provided at the inlet of the suction portion 28a, and is provided at the suction side corner where the side wall 26b and the side wall 26d of the inner wall 26 intersect. The escape portion 27 is formed with a wide concave portion 27a on the inlet side of the suction portion 28a with respect to the rotational direction of the pinion 52, and the narrow concave portion 27b gradually narrows as it advances in the D direction which is the rotational direction. It is a curvilinear recessed part which has.

  The pinion 52 constituting the rotating member rotates counterclockwise (D direction in FIG. 8) about the rotating shaft 53. Therefore, when the pinion 52 is tilted with respect to the rotation shaft 53, the end surface 52b (shown in FIG. 7) of the rotating pinion 52 approaches the inner wall 26, but after passing through the wide recess 27a of the escape portion 27, the width becomes narrow. Since the escape portion 27 is formed in a curved shape in the process of passing through the recess 27b, the sliding resistance between the pinion 52 and the inner wall 26 when the end surface 52b of the pinion 52 rotates while sliding with the inner wall 26 is reduced. can do. Therefore, the sliding resistance when the pinion 52 inclined with respect to the rotating shaft 53 contacts the inner wall 26 is alleviated, and wear due to the sliding resistance is also suppressed.

[Modification 1]
FIG. 12 is a partially enlarged view showing an essential part of Modification 1 in an enlarged manner. As shown in FIG. 12, the escape portion 27A of the first modification has a wide concave portion 27a and an inclined surface 27c. That is, the inclined surface 27 c of the escape portion 27 </ b> A is inclined in the rotation direction of the rotor 50 and the pinion 52. Therefore, the inclined surface 27c has the largest step between the wide concave portion 27a and the front-side end surface 26a in the side wall 26d of the inner wall 26, and the step is gradually reduced as it advances in the direction D, which is the rotational direction. Has an inclination angle θ.

  Therefore, when the pinion 52 is inclined with respect to the rotation shaft 53, the end surface 52b of the rotating pinion 52 approaches the inner wall 26, but passes through the wide recess 27a of the escape portion 27 and then passes through the inclined portion 27c. The sliding resistance when the pinion 52 and the corner portion of the inner wall 26 come into contact with each other is eased. Therefore, the sliding resistance when the pinion 52 inclined with respect to the rotating shaft 53 contacts the inner wall 26 is alleviated, and wear due to the sliding resistance is also suppressed.

[Modification 2]
FIG. 13 is a perspective view showing an inner configuration of the lid member of the second modification. As shown in FIG. 13, the lid member 28 </ b> B of the second modification has a suction side escape portion 27 provided at a corner of the inner wall 26 formed between the partition portion 51 and the suction portion 28 a, and the partition portion 51. A discharge-side escape portion 27B is provided at a corner portion of the inner wall 26 formed between the discharge portion 28b and the discharge portion 28b. The discharge-side escape portion 27 </ b> B is disposed so as to be symmetrical with the suction-side escape portion 27.

  Even if the pinion 52 is inclined in the reverse direction (discharge port side) with respect to the rotation shaft 53 due to a processing error of the pinion 52 and the rotation shaft 53, the escape portion 27B is provided on the discharge port side. When the pinion 52 and the corner of the inner wall 26 of the discharge port come into contact with each other in the course of passing through the wide concave portion 27a of the escape portion 27 or the concave portion 27B, the end surface 52b of the escape portion 27B slides. Dynamic resistance is eased. Therefore, regardless of the rotation direction of the pinion 52 and the inclination direction of the pinion 52 with respect to the rotation shaft 53, the sliding resistance when the pinion 52 contacts the inner wall 26 is alleviated and wear due to the sliding resistance is also suppressed.

  Further, both the escape portions 27 and 27B may be provided as described above, or only the escape portion 27B may be provided at the inner wall corner portion on the discharge side of the lid member 28B.

[Modification 3]
FIG. 14 is a view showing a pinion of the third modification. As shown in FIGS. 14 (A) and 14 (B), the pinion 52 has a plurality of recesses 52a and a plurality of teeth 52c protruding in the radial direction alternately formed on the outer periphery, and the tip of each tooth 52c. The part is brought into sliding contact with the inner wall of the pump chamber 32 and rotates in the D direction in the pump chamber 32. Further, an escape portion 57 is provided at a tip corner portion of each tooth 52c of the pinion 52 that passes through the suction port 32a or the discharge port 32b to relieve sliding resistance with the suction port 32a or the discharge port 32b. The pinion 52 shown in FIG. 14 is a perspective view seen from the lid member 28 side, and the escape portion 57 is formed at the tip corner on the lid member 28 side.

  The escape portion 57 is a curved concave portion obtained by processing the tip corner portion of the tooth 52c into an R shape, and a wide concave portion 57a is formed on the inlet side of the suction portion 28a with respect to the rotation direction (D direction) of the pinion 52, and The narrow concave portion 57b is gradually narrowed as the rotation proceeds in the D direction. Therefore, when the pinion 52 is inclined with respect to the rotation shaft 53, the tip of the tooth 52 c of the rotating pinion 52 approaches the inner wall 26. However, the relief portion 57 formed at the tip corner of the tooth 52c is in contact with the inner wall of the pump chamber 32, so that the R-shaped (curved) portion contacts the width of the relief portion 57 after the wide concave portion 57a of the relief portion 57 has passed. The sliding resistance between the pinion 52 and the inner wall 26 can be reduced in the process of passing the narrow recess 57b. Therefore, the sliding resistance when the pinion 52 inclined with respect to the rotating shaft 53 contacts the inner wall 26 is alleviated, and wear due to the sliding resistance is also suppressed.

  Further, as shown in FIG. 14C, the escape portion 57 has a curved inclined surface 57c in which the wide concave portion 57a is inclined so as to be lowered in the rotation direction (D direction) of the rotor 50 and the pinion 52. In addition, the angle of inclination is set such that the step is gradually reduced as the rotation proceeds in the direction D. The inclined surface 57c here has the largest step between the wide concave portion 57a and the front side end surface 52b.

  As described above, the escape portion 57 of the pinion 52 is provided with the inclined surface 57c. Therefore, when the pinion 52 is inclined with respect to the rotation shaft 53, the end surface 52b of the rotating pinion 52 approaches the inner wall 26. However, the sliding resistance when the pinion 52 and the corner portion of the inner wall 26 come into contact with each other in the course of the passage of the inclined portion 57c through the wide recess portion 57a of the relief portion 57 at the tip corner portion of the tooth 52c is alleviated. Is done. Therefore, the sliding resistance when the pinion 52 inclined with respect to the rotating shaft 53 contacts the inner wall 26 is alleviated, and wear due to the sliding resistance is also suppressed.

  In the above embodiment, the gear pump has been described as an example. However, the present invention is not limited thereto, and the present invention may be applied to a vane pump.

10 pump unit 23 bearing hole 24 annular recess 26 inner wall 26a front side end surfaces 26b, 26c, 26d, 26e side walls 27, 27A, 27B, 57 escape portions 27a, 57a wide recesses 27b, 57b narrow recesses 27c, 57c inclined surfaces 28, 28B Lid member 28a Suction portion 28b Discharge portion 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 side check valve 44 Strainer 46 Suction side flow Channel 47 Discharge side channel 48 Pump device 50 Rotor 51 Partition 52 Pinion 52a Recess 52b End surface 53 Rotating shaft 100 Rotor shaft 150, 151 Clearance

Claims (3)

A pump chamber 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;
A rotating member that rotates in the pump chamber;
A rotor shaft that is driven by a motor provided outside the casing and transmits the rotation of the motor to the rotating member;
In a pump device comprising:
A pump device characterized in that at least one of the suction port and the discharge port is provided with an escape portion for reducing sliding resistance with an end portion of the rotating member. A pump chamber 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;
Teeth and recesses that are in sliding contact with the inner wall of the pump chamber are alternately formed, and a rotating member that rotates in the pump chamber;
A rotor shaft that is driven by a motor provided outside the casing and transmits the rotation of the motor to the rotating member;
In a pump device comprising:
2. A pump device according to claim 1, wherein a relief portion for reducing sliding resistance with the suction port or the discharge port is provided at a tip end corner portion of the tooth facing the suction port or the discharge port of the rotating member.   3. The pump device according to claim 1, wherein a surface of the escape portion facing the rotating member and the suction port or the discharge port is inclined with respect to a rotation direction of the rotating member.

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