JP2020041523A - Electric pump - Google Patents

Abstract

To suppress pulsation of a discharge pressure of a pump by attenuating vibration of a rotary shaft with rotation of a rotor by a partition panel in an electric pump in which the rotary shaft is supported by the partition panel by which a pump chamber and a motor chamber are partitioned.SOLUTION: An electric pump comprises: a partition panel 30 which partitions a motor chamber accommodating a motor therein and a pump chamber accommodating an impeller 20 therein as mutually independent spaces; a pair of covers 11 and 12 covering the motor chamber and the pump chamber while interposing the partition panel 30 therebetween; and an O ring 71 which is interposed between the pair of covers 11 and 12 and seals the motor chamber and the pump chamber from an external space. The pair of covers 11 and 12 include: support surfaces which support the partition panel 30 while facing each other with the partition panel 30 interposed therebetween; and seal surfaces which cause the O ring 71 to present a seal function by facing each other while holding the O ring 71 therebetween in an abutted state. The partition panel 30 supporting a bearing 42 is stably supported by the pair of covers 11 and 12 independently of a seal structure.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electric pump.

  In the electric pump of Patent Document 1, a pump chamber including an impeller and a motor chamber including a stator and a rotor are partitioned by a partition plate. The impeller and the rotor are connected by one rotating shaft, and the rotating shaft is supported by a bearing held in a state of being penetrated by the partition plate. A cover that defines the pump chamber and a cover that defines the motor chamber are combined to form an electric pump.

  The joint between the two covers is sealed with an O-ring. Two O-rings are used. One O-ring seals between the cover of the pump chamber and the partition plate, and the other O-ring seals between the cover of the motor room and the partition plate.

International Publication No. WO 2016/169611

  In general, it is unavoidable that the rotor has a non-uniform rotational balance. When the rotor is rotated at a high speed, a vibration occurs on the rotating shaft due to the non-uniform rotational balance. This vibration is transmitted to the impeller and causes pulsation in the discharge pressure of the pump.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric pump in which a rotation shaft is supported by a partition plate that separates a pump chamber and a motor chamber, and the vibration of the rotation shaft accompanying rotation of the rotor is attenuated by the partition plate. Thereby, the pulsation of the discharge pressure of the pump is suppressed.

  An electric pump according to a first aspect of the present invention includes a motor including a stator and a rotor housed in a motor chamber, and an impeller housed in the pump chamber and transmitting the rotation of the rotor to pump the fluid from the suction port to the discharge port. A partition plate that partitions the motor chamber and the pump chamber as spaces independent of each other, a rotating shaft that coaxially rotates a rotor and an impeller, a bearing that supports a rotating shaft on the partition plate, and the partition plate. A pair of covers for covering the motor chamber and the pump chamber; and a seal member interposed between the pair of covers to seal the motor chamber and the pump chamber from an external space. The pair of covers oppose each other with the partition plate therebetween and support the partition plate, and the sealing member exerts a sealing function by being opposed to the support surface with the seal member in contact therewith. And a sealing surface.

  According to the first invention, the motor chamber and the pump chamber are sealed from the external space by the seal member being sandwiched between the seal surfaces of the pair of covers. On the other hand, the partition plate is supported by being sandwiched between the support surfaces of the pair of covers. Therefore, the partition plate supporting the bearing is stably supported by the pair of covers independently of the seal structure. Therefore, the position of the impeller supported by the partition plate via the bearing and the rotating shaft can be stabilized. Further, the vibration of the rotating shaft caused by the rotation of the rotor is attenuated by the partition plate, so that the pulsation of the discharge pressure of the pump can be suppressed.

  In a second aspect of the present invention based on the first aspect, the support surface is disposed closer to the motor chamber and the pump chamber than the sealing surface.

  According to the second aspect, since the support surface of the partition plate is closer to the motor chamber and the pump chamber than the seal by the seal member, it is possible to realize sealing of both the motor chamber and the pump chamber with one seal member.

  According to a third aspect of the present invention, in the first or second aspect, when the pair of covers are combined with each other, the corner on the other side faces the corner on one side, and When the corners face each other, a bent gap having a shape bent at the tip of the corner is formed, and a pair of opposing surfaces forming one side from the bent portion of the bent gap are formed with the support surface. The pair of opposing surfaces forming the other side of the bent portion of the bent gap are the seal surfaces.

  According to the third aspect of the present invention, the support of the partition plate and the sealing by the seal member can be performed independently of each other by one bent gap having a bent shape formed when the pair of covers are combined. Therefore, the operation and effect of the first invention can be achieved with a simple configuration.

  In a fourth aspect of the present invention, in any one of the first to third aspects, the partition plate has heat conductivity and conductivity, and a bearing support portion that wraps and supports the bearing from the outer peripheral side thereof, and a motor. And a cylindrical portion surrounding the stator and the rotor from the outer peripheral side thereof.

  According to the fourth invention, since the partition plate has heat conductivity and wraps and supports the bearing, the heat of the bearing can be received by the bearing support portion and guided to the outer peripheral side of the motor to dissipate heat. Further, since the partition plate has conductivity and surrounds the motor, it is possible to shield noise electric waves generated by the motor.

  In a fifth aspect of the present invention based on the fourth aspect, the partition plate is elastically deformable at a portion connecting the bearing support portion and the cylindrical portion by receiving a run-out of a rotating shaft via the bearing support portion. And an elastic part.

  According to the fifth aspect, when the bearing support section receives the vibration of the rotating shaft, the elastic section receives the vibration and elastically deforms to attenuate the vibration energy. Therefore, the vibration of the partition plate accompanying the vibration of the rotating shaft can be suppressed, and the pulsation of the discharge pressure of the pump can be suppressed.

  In a sixth aspect of the present invention based on the fifth aspect, the elastic portion is configured by weakening a bending rigidity of the partition plate.

  According to the sixth aspect, since the elastic portion is configured by weakening the bending rigidity of the partition plate, the configuration of the partition plate can be suppressed from being complicated by providing the elastic portion.

  In a seventh aspect of the present invention based on the fourth aspect, the partition plate includes a flange portion extending to the outer peripheral side at an opening edge of the cylindrical portion, and the flange portion is one of the pair of covers. The elastic portion is formed by a cut-and-raised piece formed by cutting and raising a part of the plate surface of the partition plate toward the motor chamber side. The cut-and-raised piece is elastically deformable with its tip abutting on a part of the stator.

  According to the seventh aspect, a cut-and-raised piece is formed by cutting and raising a part of the partition plate, and an end of the cut-and-raised piece contacts a part of the stator to form an elastic portion. Therefore, the partition plate is positioned in a state where the flange portion is engaged with the pair of covers by the elastic force of the cut-and-raised pieces. As a result, the position of the impeller supported by the partition plate via the bearing and the rotating shaft can be stabilized. Further, since the cut-and-raised piece is elastically deformable, the cut-and-raised piece is deformed by the vibration of the rotating shaft, and can attenuate the vibration energy. Further, a part of the fluid in the pump chamber is introduced into the motor chamber through the opening of the partition plate formed together with the cut and raised piece, and the partition plate and each part of the motor can be cooled by the fluid.

  In an eighth aspect of the present invention based on the seventh aspect, the cut-and-raised piece has a cut-and-raised surface formed along a flow of a fluid on a surface of the partition plate generated by an impeller, and a flow of the fluid is provided. The tip is formed so as to be located on the downstream side of.

  According to the eighth aspect, since the cut-and-raised surface of the cut-and-raised piece is formed so as to follow the flow of the fluid generated by the impeller, the fluid flows smoothly from the pump chamber to the motor chamber via the opening of the cut-and-raised piece. Flows into. Therefore, the motor is efficiently cooled by the fluid.

  In a ninth aspect of the present invention based on the seventh or eighth aspect, three or more cut-up pieces are provided.

  According to the ninth aspect, the partition plate is supported on the stator by the three or more cut and raised pieces. Therefore, the partition plate is stably supported by the stator.

  According to a tenth aspect of the present invention, in the fourth aspect, a circuit board on which a motor drive circuit is formed is provided outside the motor chamber, and the circuit board corresponds to a region surrounded by a cylindrical portion of the partition plate. It is formed in the size which is.

  According to the tenth aspect, since the circuit board has a size corresponding to the area inside the motor chamber surrounded by the tubular portion of the partition plate, the radio wave generated from the circuit board is shielded by the wrapping portion of the partition plate. Can be.

  According to an eleventh aspect of the present invention, in any one of the tenth aspects, a plurality of spacers distributed along the outer peripheral surface of the stator are provided between the outer peripheral side of the stator and the cylindrical portion of the partition plate. In addition, a plurality of annular gaps are formed between the spacers and arranged in a ring shape as a whole.

  According to the eleventh invention, since a gap is formed between the outer peripheral side of the stator and the cylindrical portion of the partition plate, the fluid flowing from the pump chamber through the opening of the cut-and-raised piece enters the gap, The cooling of the stator and the partition plate is performed efficiently.

  In a twelfth aspect of the present invention based on the eleventh aspect, a coil terminal for connecting a drive circuit of the circuit board and a stator coil is provided in the annular gap.

  According to the twelfth aspect, since the coil terminal for connecting the motor drive circuit and the stator coil is arranged in the annular gap on the outer periphery of the stator, it is not necessary to separately provide an installation space for the coil terminal, and the motor can be downsized. Can be. In addition, since the coil terminal is adjacent to the package of the partition plate, heat of the stator can be radiated through the coil terminal and the package of the partition plate.

  According to a thirteenth aspect of the present invention, in the tenth aspect of the present invention, the cover is fixed to a cover of the pair of covers that covers the motor chamber, and covers a region corresponding to the open side of the cylindrical portion including the circuit board. A conductive cover having conductivity is provided.

  According to the thirteenth aspect, since the open sides of the circuit board and the cylindrical portion are covered with the conductive cover, the noise electric wave generated from the circuit board and the noise electric wave leaking from the cylindrical portion of the partition plate can be shielded by the conductive cover. it can.

  According to a fourteenth aspect of the present invention, in any one of the fourth to thirteenth aspects, the bearing support portion is disposed along an inner peripheral side of the stator.

  According to the fourteenth aspect, the bearing support portion of the partition plate supports the outer peripheral side of the bearing and is disposed along the inner peripheral side of the stator. Therefore, the partition plate receives not only the heat of the bearing but also the heat of the stator, and can guide those heats to the outside of the motor to radiate the heat.

  According to a fifteenth aspect of the present invention, in any one of the first to fourteenth aspects, one of the pair of covers, on which a suction port and a discharge port are formed, includes an impeller, the partition plate, and a motor. The one-side cover has a container-shaped opening edge. The container-shaped opening edge of the one-side cover sandwiches the peripheral edge of the partition plate. It is shaped to be in contact and fixed.

  According to the fifteenth aspect, in a state where the impeller, the partition plate, and the motor are inserted into one side of the pair of covers, the peripheral portion of the cover on the other side is sandwiched by the peripheral edge of the partition plate at the opening edge of the cover on one side. The electric pump can be assembled by contacting and fixing. That is, assembling of the electric pump can be performed only by work from one direction, and productivity can be improved.

1 is an external perspective view of an electric pump according to a first embodiment of the present invention. It is a side view of a 1st embodiment. It is a top view of a 1st embodiment. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is an enlarged view of a portion V in FIG. 4. FIG. 6 is a sectional view taken along line VI-VI of FIG. 4. It is a figure corresponding to Drawing 4 showing a 2nd embodiment of the present invention. It is a figure corresponding to Drawing 4 showing a 3rd embodiment of the present invention. It is a figure corresponding to Drawing 4 showing a 4th embodiment of the present invention. FIG. 10 is a sectional view taken along line XX of FIG. 9. FIG. 11 is a sectional view taken along the line XI-XI in FIG. 10. It is a figure corresponding to Drawing 4 showing a 5th embodiment of the present invention. It is a figure corresponding to Drawing 4 showing a 6th embodiment of the present invention. It is an enlarged view of the XIV part of FIG. It is a figure corresponding to Drawing 4 showing a 7th embodiment of the present invention.

<Overall Configuration of First Embodiment>
1 to 6 show a first embodiment of the present invention. The electric pump according to the first embodiment is a purge pump used for an evaporative fuel processing device of an automobile equipped with a gasoline engine. Of course, the electric pump of the present invention is not limited to the purge pump, but can be applied to various automobile and non-automotive electric pumps. In each figure, "F" of the arrow indicating the direction indicates the front side of the purge pump, and "B" indicates the back side of the purge pump.

  As shown in FIG. 4, a purge pump (hereinafter, simply referred to as a pump) includes a brushless motor and an impeller 20. The impeller 20 is connected to a rotating shaft 41 of the brushless motor. The brushless motor includes a stator 50 and a rotor 40. The stator 50 includes a stator core 51 and a stator coil 52.

  The brushless motor and the impeller 20 are covered by a front cover 11 and a stator body 12, which form one side of a pair of covers. The stator body 12 forms the other side of the pair of covers and integrates the stator core 51 and the stator coil 52 by resin molding. The space defined by the front cover 11 and the stator body 12 is further divided into two spaces by a partition plate 30. Of the two spaces, the front side F is a pump chamber that houses the impeller 20, and the back side B is a motor chamber that houses the stator 50 and the rotor 40.

  The front cover 11 is in the shape of a cylindrical container made of resin, has a suction port 11a corresponding to the center of rotation of the impeller 20, and has a discharge port 11b along a tangential direction of the outer periphery of the impeller 20 (see FIGS. 4). Therefore, when the impeller 20 is rotated, the evaporated fuel in the evaporated fuel processing device (not shown) is sucked through the suction port 11a, discharged from the discharge port 11b, and supplied to the engine.

<Configuration of the partition plate 30>
The partition plate 30 has a cylindrical container shape that fits inside the front cover 11, and is made of metal having heat conductivity and conductivity. The partition plate 30 has a bearing support 31 for receiving the bearing 42 at a position corresponding to the center of the bottom of the cylindrical container. The bearing 42 rotatably supports the rotating shaft 41 between the impeller 20 and the rotor 40. Further, the bearing support 31 is formed so as to wrap the outer periphery of the bearing 42.

  The outer peripheral cylindrical portion of the cylindrical container of the partition plate 30 is a cylindrical portion 32 that surrounds the stator 50 from the outer peripheral side. The portion of the partition plate 30 connecting the bearing support portion 31 and the cylindrical portion 32 is an elastic portion 33 which is capable of receiving the vibration of the rotating shaft 41 via the bearing support portion 31 and being elastically deformable. Specifically, the elastic portion 33 is formed of a flat surface so as to be easily deformed as compared with the bearing support portion 31 and the cylindrical portion 32. That is, the bending rigidity of the elastic portion 33 is weakened.

  By configuring the partition plate 30 in this manner, the heat of the bearing 42 is received by the bearing support portion 31 and transmitted to the elastic portion 33, and the elastic portion 33 contacts the fluid pumped by the impeller 20 to radiate heat. it can. Further, noise radio waves emitted from the stator coil 52 can be shielded by the cylindrical portion 32. Further, the elastic portion 33 is elastically deformed by the vibration of the rotating shaft 41, and the vibration energy can be attenuated. Therefore, the pulsation of the discharge pressure of the pump due to the vibration of the rotating shaft 41 can be suppressed. On the other hand, since the rigidity of the partition plate 30 near the cylindrical portion 32 corresponding to the volute portion on the outer periphery of the impeller 20 is increased, the deflection of the partition plate 30 is small even when the fluid pressure increases in the volute portion, and the impeller 20 is separated from the impeller 20. The gap with the plate 30 can be maintained substantially constant. Moreover, pulsation of the discharge pressure of the pump can be suppressed.

  A flange portion 30 a extending to the outer peripheral side of the cylindrical portion 32 is formed at the opening edge of the partition plate 30. The flange portion 30a is sandwiched between the opening edge of the cylindrical container of the front cover 11 and the outer peripheral surface of the front side F of the flange portion 12a of the stator body 12 in a sealed state. The structure of the portion indicated by V in FIG. 4 will be described in detail with reference to FIG.

  In this portion, the structure of the front cover 11 and the stator body 12 is combined such that the corner 11d of the front cover 11 faces the corner 12b of the stator body 12. A bent gap 13 is formed between the corner 12b and the corner 11d, and the bent gap 13 is bent at the tip of the corner 12b to form a bent portion 13a. A pair of opposing surfaces that form one side of the bent portion 13a of the bent gap 13 are support surfaces 11e and 12c that support the partition plate 30 with the flange portion 30a interposed therebetween. A pair of opposing surfaces forming the other side of the bent portion 13a of the bent gap 13 have sealing surfaces 11f and 12d for sealing between the front cover 11 and the stator body 12 with an O-ring 71 serving as a sealing member therebetween. It has been.

  As described above, between the corner 12b and the corner 11d, the support of the flange 30a of the partition plate 30 and the clamping of the O-ring 71 are performed independently of each other. Therefore, the partition plate 30 that supports the bearing 42 is stably supported between the front cover 11 and the support surfaces 11 e and 12 c of the stator body 12 without being affected by the presence of the O-ring 71. Therefore, the position of the impeller 20 supported by the partition plate 30 via the bearing 42 can be stabilized. Further, the vibration of the rotating shaft 41 caused by the rotation of the rotor 40 is attenuated by the partition plate 30, so that the pulsation of the discharge pressure of the pump can be suppressed.

  Moreover, the sealing by the O-ring 71 is performed between the front cover 11 and the stator body 12, and the partition plate 30 is located closer to the room than the position of the seal. Therefore, one O-ring 71 can seal both the pump chamber and the motor chamber. Further, with a simple configuration using one bending gap 13 having a bending shape, the support of the partition plate 30 and the sealing by the O-ring 71 can be performed independently of each other.

<Configuration of Stator 50 and Rotor 40>
As shown in FIGS. 4 and 6, the stator 50 has a six-pole structure, and receives U-, V-, and W-phase stator coils 52 that receive a three-phase AC drive current from a drive circuit (not shown), and the stator coils thereof. The stator coil 52 and the stator coil 52 connected in series to the coil 52 are divided into six poles and arranged annularly. Each stator coil 52 and stator core 51 are integrated by the stator body 12 so as to maintain their respective positional relationships. The rotor 40 is rotatably arranged at the center of each of the stator coils 52 arranged annularly. Further, a plurality of spacers 12f are arranged on the outer peripheral side of the stator core 51 so as to be dispersed in the circumferential direction. Each spacer 12f is integrated with the stator body 12. As a result, an annular gap 12g is formed between the spacers 12f, and the stator core 51 is exposed to the space of the annular gap 12g.

<Overall bonding structure>
As shown in FIG. 4, the flange 30 a of the partition plate 30 and the flange 12 a integrally formed on the outer periphery of the stator body 12 are superimposed on the flange 11 c integrally formed on the outer periphery of the front cover 11. A back cover 81 (corresponding to the conductive cover of the present invention) is provided on the back side B of the sandwich. The back cover 81 has conductivity and is formed in a container shape facing the front cover 11. A liquid seal 72 is provided between the opening edge of the container of the back cover 81 and the back side B of the flange portion 12a of the stator body 12. In the liquid seal 72, a ridge 12e formed on the stator body 12 side is fitted in a groove 81a formed on the back cover 81 side, and a sealant is sealed between the two.

  The coupling between the flange portion 11c of the front cover 11 and the flange portion 81b of the back cover 81 is performed by clamps 92 provided at a plurality of positions (four in this case) along the outer periphery.

  As described above, the rotating shaft 41 is inserted from the back side B into the inside of the container-shaped front cover 11 in a state where the impeller 20 and the rotor 40 supported by the bearing 42 are assembled to the partition plate 30, and further, the back side B is inserted. The pump is assembled with the stator body 12 and the back cover 81 overlapped. The work of assembling each component is performed only in one direction from the back side B, so that productivity can be improved.

<Configuration of circuit board 60 and its peripheral components>
The circuit board 60 is fixed to the back side B of the stator body 12 in a region covered by the back cover 81. The circuit board 60 is formed in a size corresponding to a region in the motor room surrounded by the cylindrical portion 32 of the partition plate 30. The circuit board 60 is connected to a circuit element (not shown) such as an IC chip required as an electric circuit on the back side B, and has a coil terminal 61, a power supply terminal 62 and an earth terminal 63 on the front side F. Each is erected and connected to an electric circuit. Note that the circuit board 60 may be integrated with the stator body 12.

  The coil terminal 61 is electrically connected to the stator coil 52. The ground terminal 63 is in contact with the inner wall of the partition plate 30 and is connected to the back cover 81. In addition, the ground terminal 63 is electrically connected to a ground terminal (not shown) in the connector 91. The power supply terminal 62 is provided so as to supply power to the electric circuit of the circuit board 60, and extends into the connector 91 to be a connector terminal. Here, the connector 91 is formed integrally with the stator body 12. The connector 91 may be formed separately from the stator body 12.

  Since the circuit board 60 has a size corresponding to the area surrounded by the cylindrical portion 32 of the partition plate 30, noise radio waves emitted to the front side F of the circuit board 60 can be absorbed by the cylindrical portion 32. Further, since the back side B of the circuit board 60 is covered with the back cover 81, noise electric waves emitted to the back side B of the circuit board 60 and noise electric waves emitted to the back side B from the stator coil 52 are not covered by the back cover. 81 can be absorbed.

<Second embodiment>
FIG. 7 shows a second embodiment of the present invention. A feature of the second embodiment over the first embodiment is that the position of the coil terminal 61 is changed. In other respects, the second embodiment is the same as the first embodiment, and the same configuration will not be described again.

  The coil terminal 61 is formed to extend from the circuit board 60 to the front side F, and the front side F penetrates through the stator body 12 and is disposed in the annular gap 12 g on the outer peripheral side of the stator core 51. The front side F end of the coil terminal 61 is connected to the front side F of the stator coil 52.

  As described above, the connection between the stator coil 52 and the electric circuit of the circuit board 60 is performed by the coil terminal 61 disposed on the outer peripheral side of the stator coil 52, and the connection between the coil terminal 61 and the stator coil 52 is performed by the circuit of the coil terminal 61. This is performed on the side remote from the substrate 60. Therefore, the coil terminal 61 is not disposed at a portion sandwiched between the back side B of the stator coil 52 and the circuit board 60, and the stator coil 52 and the circuit board 60 can be arranged close to each other. The size in the direction can be reduced.

  The coil terminal 61 is located on the outer peripheral side of the stator 50, and is arranged so as to partially overlap the stator 50 in the axial direction of the rotating shaft 41. That is, a part of the coil terminal 61 is arranged in a space beside the stator 50. Therefore, an increase in the axial dimension of the brushless motor due to the coil terminal 61 is suppressed, and the axial size of the rotating shaft 41 of the brushless motor can be reduced.

  Further, the coil terminal 61 receives the heat of the stator coil 52 and radiates the heat to the cylindrical portion 32 of the adjacent partition plate 30. Therefore, the heat of the stator coil 52 is radiated to the outside through the cylindrical portion 32 of the partition plate 30, and heat damage to the stator 50 can be suppressed.

<Third embodiment>
FIG. 8 shows a third embodiment of the present invention. The features of the third embodiment with respect to the first embodiment are that the back cover 81 is changed to the back cover 82 and that a seal with a liquid seal 73 is used instead of the seal with the O-ring 71. is there. In other respects, the third embodiment is the same as the first embodiment, and the description of the same configuration will not be repeated.

  In the first embodiment of FIG. 4, the flange 81b on the outer peripheral side of the back cover 81 is coupled to the flange 11c of the front cover 11, whereas in the third embodiment of FIG. 8, the size of the back cover 82 is reduced. It is larger than the back cover 81. The outer flange 82b of the container-shaped back cover 82 has a size that wraps the flange 11c of the front cover 11 inside the container.

  Here, the connection between the front cover 11 and the back cover 82 is performed by the clamp 92 with the flange portion 12a of the stator body 12 interposed therebetween, as in the first embodiment of FIG. However, the connection by the clamp 92 cannot be performed at a portion where the flange portion 82b of the back cover 82 exists on the outer peripheral side of the flange portion 11c of the front cover 11. For this reason, the flange portion 82b of the back cover 82 is cut off at the portion where the connection is performed by the clamp 92, so that the clamp 92 can be engaged with the bottom outer periphery 82c of the back cover 82.

  The sealing of the back cover 82 to the flange portion 12a of the stator body 12 is performed by a liquid seal 72. The liquid seal 72 is provided between the flange portion 12a of the stator body 12 and the outer periphery 82c of the container-shaped bottom of the back cover 82. It is done in. However, in the portion where the connector 91 is integrated with the stator body 12, the liquid seal 72 is formed between the back side B of the connector 91 and the outer periphery 82c at the bottom of the back cover 82.

  According to the third embodiment, since the open side of the cylindrical portion 32 of the partition plate 30 is covered by the back cover 82, noise radio waves from the stator 50 leaking from the open side of the cylindrical portion 32 of the partition plate 30 are removed by the back cover 82. Can be shielded. Further, the noise electric wave from the coil terminal 61 radiated in the direction orthogonal to the direction of the current flowing through the coil terminal 61 can be absorbed by the flange portion 82 b of the back cover 82.

<Fourth embodiment>
FIG. 9 shows a fourth embodiment of the present invention. The feature of the fourth embodiment with respect to the first embodiment is that the elastic portion 33 of the partition plate 30 is constituted by the cut and raised pieces 33a. In other respects, the fourth embodiment is substantially the same as the first embodiment, and the same configuration will not be described again.

  As shown in FIGS. 10 and 11, a plurality of (four in this case) cut-and-raised pieces 33 a are provided between the bearing support portion 31 and the cylindrical portion 32 of the partition plate 30. The cut-and-raised piece 33a cuts and raises a part of the plate surface of the partition plate 30 toward the motor chamber, and is elastically deformable in a state where the cut-and-raised tip 33b is in contact with the front side F of the stator body 12. The cut-and-raised piece 33a is formed with a cut-and-raised surface 33c so as to follow the flow of the fluid on the surface of the partition plate 30 generated by the impeller 20 (see broken arrows in FIGS. 10 and 11). The tip 33b is formed so as to be located on the downstream side. As a result of the formation of the cut and raised piece 33a, an opening 33d is formed in a portion of the partition plate 30 corresponding to the cut and raised piece 33a.

  In FIG. 9, the cut-and-raised piece 33a is shown in an easily understandable shape for convenience, and is not shown in an accurate shape. To be precise, the cut and raised piece 33a is formed by cutting and raising the plate surface along the outer peripheral shape of the bearing 42 of the partition plate 30, as shown in FIGS. In FIG. 9, a solid arrow indicates a flow of air (also referred to as a fluid) containing evaporated fuel sucked from the suction port 11a by the impeller 20 and discharged from the discharge port 11b, and a broken arrow indicates a part of the air. Shows a flow flowing into each part in the motor chamber through the opening 33d of the partition plate 30.

  According to the fourth embodiment, the tip 33b of the cut-and-raised piece 33a is in contact with the front side F of the stator body 12. Therefore, the partition plate 30 is positioned in a state where the flange portion 30a is engaged with the flange portion 11c of the front cover 11 by the elastic force of the cut and raised piece 33a. As a result, the position of the impeller 20 supported by the partition plate 30 via the bearing 42 and the rotating shaft 41 can be stabilized. Further, since the cut-and-raised piece 33a is elastically deformable, the cut-and-raised piece 33a is deformed by the vibration of the rotating shaft 41, and can attenuate vibration energy. Further, a part of the fluid in the pump chamber is introduced into the motor chamber through the opening 33d of the partition plate 30 formed together with the cut and raised piece 33a, and the partition plate 30 and each part of the motor can be cooled by the fluid. For example, the fluid flows into the inner peripheral side of the stator body 12 on the outer peripheral side of the rotor 40 via the outer peripheral side of the bearing 42, and also flows into the annular gap 12 g on the outer peripheral side of the stator body 12.

  The cut and raised surface 33c of the cut and raised piece 33a is formed so as to follow the flow of the fluid generated by the impeller 20. Therefore, fluid smoothly flows from the pump chamber to the motor chamber through the opening 33d. As a result, the motor is efficiently cooled by the fluid. Further, four cut and raised pieces 33a are provided, and the partition plate 30 is supported by the cut and raised pieces 33a on the stator body 12 at four locations on the outer periphery of the bearing 42. Therefore, the partition plate 30 is stably supported by the stator body 12. In the fourth embodiment, four cut-and-raised pieces 33a are provided, but three or more cut-and-raised pieces 33a may be provided for stable support of the partition plate 30.

<Fifth embodiment>
FIG. 12 shows a fifth embodiment of the present invention. The feature of the fifth embodiment over the fourth embodiment (see FIG. 9) is that the support of the rotating shaft 41 by the bearing 42 is changed from a cantilever structure (the fourth embodiment) to a double-support structure. It is. In other respects, the fifth embodiment is the same as the fourth embodiment, and the same configuration will not be described again.

  According to the fifth embodiment, the bearing 42 supports the rotating shaft 41 on both sides of the rotor 40. Moreover, the bearing 42 on the back side B is directly fixed to the stator body 12. Therefore, the rotating shaft 41 is stably supported, and the position of the impeller 20 can be stabilized. Further, vibration of the rotating shaft 41 can be suppressed, and pulsation of the discharge pressure of the pump can be suppressed.

<Sixth embodiment>
13 and 14 show a sixth embodiment of the present invention. The feature of the sixth embodiment over the fourth embodiment (see FIG. 9) is that the cut and raised piece 33a of the fourth embodiment is changed to a cut and raised piece 33e. In other respects, the sixth embodiment is the same as the fourth embodiment, and the same configuration will not be described again.

  The cut and raised piece 33e is provided adjacent to the front side F of the cylindrical portion 32 of the partition plate 30. The shape of the cut and raised piece itself is the same as that of the cut and raised piece 33a of the fourth embodiment. However, the tip 33f of the cut and raised piece 33e is in contact with the front side F end of the spacer 12f. 13 and 14, the cut and raised piece 33e is shown in an easily understandable shape for convenience, and is not shown in an accurate shape. To be precise, the cut and raised piece 33e is formed by cutting and raising the plate surface along the ring shape of the cylindrical portion 32 of the partition plate 30, as shown in FIGS.

  According to the sixth embodiment, the opening 33g formed in the partition plate 30 by the cut and raised piece 33e is located at the volute portion on the outer periphery of the impeller 20. Therefore, the fluid easily flows into the motor chamber from the volute through the opening 33g, and the cooling effect of each part of the motor is enhanced.

<Seventh embodiment>
FIG. 15 shows a seventh embodiment of the present invention. The feature of the seventh embodiment over the fifth embodiment (see FIG. 12) is that the back side B is covered with the bearing support portion 31 in addition to the outer peripheral sides of the rotor 40 and the bearing 42. . In other respects, the seventh embodiment is the same as the fifth embodiment, and the same configuration will not be described again.

  According to the seventh embodiment, the bearing support 31 of the partition plate 30 has a cylindrical container shape. The bearing support portion 31 supports the outer peripheral side of the bearing 42 and is arranged along the inner peripheral side of the stator 50. Therefore, the partition plate 30 receives not only the heat of the bearing 42 but also the heat of the stator 50 in the bearing support portion 31, and the heat can be guided to the outside of the motor by the cylindrical portion 32 and radiated. In this case, the partition plate 30 needs to be made of a non-magnetic material.

<Other embodiments>
Although the specific embodiments have been described above, the present invention is not limited to the appearance and the configuration, and various changes, additions, and deletions are possible. For example, the motor is not limited to a brushless motor, and various motors can be used.

  Further, in the above embodiment, the brushless motor has a configuration in which the rotor is provided on the inner peripheral side of the stator coil. However, the brushless motor may have a configuration in which the rotor is provided on the outer peripheral side of the stator coil.

  Furthermore, the characteristic configurations of the first to seventh embodiments may be used in appropriate combinations.

11 Front cover (a pair of covers, one side cover)
11a Suction port 11b Discharge port 11c Flange section 11d Corner section 11e Support surface 11f Seal surface 12 Stator body (a pair of covers, a cover on the other side)
12a flange portion 12b corner portion 12c support surface 12d sealing surface 12e ridge 12f spacer 12g annular gap 13 bending gap 13a bending portion 20 impeller 30 partition plate 30a flange portion 31 bearing support portion 32 cylinder portion 33 elastic portion 33a, 33e 33b, 33f Tip 33c Cut-and-raised surface 33d, 33g Opening 40 Rotor 41 Rotary shaft 42 Bearing 50 Stator 51 Stator core 52 Stator coil 60 Circuit board 61 Coil terminal 62 Power supply terminal 63 Earth terminal 71 O-ring (seal member)
72 Liquid seal 73 Liquid seal (seal member)
81, 82 Back cover (conductive cover)
81a Groove 81b Flange 82b Flange 82c Bottom outer periphery 91 Connector 92 Clamp

Claims (15)

A motor including a stator and a rotor housed in a motor room;
An impeller that is housed in the pump chamber, is transmitted with the rotation of the rotor, and pumps fluid from the suction port to the discharge port;
A partition plate that partitions the motor chamber and the pump chamber as spaces independent of each other,
A rotating shaft for coaxially rotating the rotor and the impeller,
A bearing for supporting a rotating shaft on the partition plate,
A pair of covers that cover the motor chamber and the pump chamber with the partition plate interposed therebetween,
A sealing member interposed between the pair of covers to seal the motor chamber and the pump chamber from an external space,
The pair of covers,
A support surface that supports the partition plate facing each other across the partition plate,
An electric pump comprising: a seal surface that causes the seal member to perform a sealing function by being opposed to each other while sandwiching the seal member in contact with the seal member. In claim 1,
An electric pump wherein the support surface is disposed closer to the motor chamber and the pump chamber than the seal surface. In claim 1 or 2,
When the pair of covers are combined with each other, the corner on the other side is opposed to the corner on one side, and the corner is opposed to the corner so that the cover bends at the tip of the corner. It becomes a state where the bending gap of the shape is formed,
A pair of opposing surfaces forming one side from the bent portion of the bending gap is the support surface,
An electric pump in which a pair of opposing surfaces forming the other side of the bending portion of the bending gap are the sealing surfaces. In any one of claims 1 to 3,
The partition plate has heat conductivity and conductivity, and is an electric pump integrally provided with a bearing support portion that wraps and supports the bearing from the outer peripheral side thereof and a cylindrical portion that surrounds the stator and the rotor of the motor from the outer peripheral side. . In claim 4,
An electric pump, wherein the partition plate includes an elastic portion that is elastically deformable at a portion connecting the bearing support portion and the cylindrical portion, the elastic portion being capable of receiving a run-out of a rotating shaft via the bearing support portion. In claim 5,
The electric pump, wherein the elastic portion is configured to reduce bending rigidity of the partition plate. In claim 4,
The partition plate includes a flange portion extending to the outer peripheral side at an opening edge of the cylindrical portion,
The flange portion is engaged with one side of the pair of covers in the axial direction of the rotation shaft,
The elastic portion is configured by a cut and raised piece formed by cutting and raising a part of the plate surface of the partition plate toward the motor chamber side,
An electric pump wherein the cut-and-raised piece is elastically deformable in a state in which a tip thereof abuts a part of a stator. In claim 7,
The cut-and-raised piece is formed such that a cut-and-raised surface is formed along the flow of the fluid on the surface of the partition plate generated by an impeller, and the tip is located downstream of the flow of the fluid. Electric pump. In claim 7 or 8,
An electric pump provided with three or more cut and raised pieces. In claim 4,
A circuit board on which a motor driving circuit is formed is provided outside the motor chamber,
The electric pump, wherein the circuit board is formed in a size corresponding to a region surrounded by a cylindrical portion of the partition plate. In claim 10,
A plurality of spacers are provided between the outer peripheral side of the stator and the cylindrical portion of the partition plate along the outer peripheral surface of the stator. An electric pump in which is formed. In claim 11,
An electric pump comprising a coil terminal for connecting a drive circuit of the circuit board and a stator coil in the annular gap. In claim 10,
An electric pump comprising: a conductive cover fixed to a cover on the side covering the motor chamber of the pair of covers and covering a region corresponding to an open side of the cylindrical portion including the circuit board. In any one of claims 4 to 13,
The electric pump, wherein the bearing support is disposed along an inner peripheral side of the stator. In any one of claims 1 to 14,
One of the pair of covers, on which the suction port and the discharge port are formed, is formed in a container shape capable of receiving the impeller, the partition plate, and the motor,
The container-shaped opening edge of the one-side cover has a shape in which the peripheral edge of the other side of the pair of covers is abutted and fixed while sandwiching the peripheral edge of the partition plate. pump.

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