JP2012154282A - Electric fluid pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric fluid pump having a bearing member composed of a fewer number of components while eliminating, as much as possible, processing of a shaft member that supports a rotating body.SOLUTION: The electric fluid pump includes: a case 2 forming a fluid chamber; a rotating body 10, which includes a rotor 11 with a fixed permanent magnet on an outer circumference on one side in the rotation-axis direction and includes an impeller 12, sucking a fluid through a suction port and ejecting the fluid through an ejecting port, on the other side in the rotation-axis direction; and a drive part which is disposed on an outer circumference of the rotor 11 and generates a magnetic field that drives to rotate the rotor 11. The electric fluid pump also includes: a hollow rolling bearing member 33, which can respond to a radial load and a thrust load of the rotating body 10, at any one end of a rotor side end 11A and an impeller side end 12A in the rotation-axis direction of the rotating body 10; and a fixed bearing member 36, which can respond to the radial load and the thrust load of the rotating body 10 and is in the same shape as the rolling bearing member 33, on the case 2 opposing to the other end.

Description

  The present invention relates to an electric fluid pump that delivers fluid by rotation of a rotor.

  For example, there is a fluid pump that supports a rotor on a shaft member fixed to a casing and sends fluid by rotation of the rotor, such as an electric fluid pump described in Patent Document 1. This electric fluid pump includes a rotor having a permanent magnet fixed on the outer periphery and a rotating body having an impeller coupled integrally with the rotor. A drive unit that generates a rotating magnetic field is provided on the outer periphery of the partition wall surrounding the rotor, and the rotor is driven to rotate by this drive unit. A rotating body having a rotor and an impeller is supported by a shaft whose cylindrical portion is fixed to a case. The cylindrical portion is formed with a bearing portion that engages with the shaft in the radial direction. Moreover, the nut fastened to the shaft functions as a restricting means for the movement of the rotating body in the thrust direction.

JP 2006-9707 A

  In the electric fluid pump of Patent Document 1, in the case-side shaft that supports the rotating body, a process for distinguishing between a portion that receives the bearing portion formed in the cylindrical portion of the rotating body and a portion that does not contact the cylindrical portion. As a result, it is necessary to process the entire shaft. Further, since the radial bearing and the thrust bearing of the rotating body are formed of separate members, the number of parts increases.

  An object of the present invention is to provide an electric fluid pump including a bearing member configured with a small number of parts while minimizing the processing of a shaft member that supports a rotating body.

  A first characteristic configuration of an electric fluid pump according to the present invention is provided with a case forming a fluid chamber having a fluid suction port and a fluid discharge port, and a rotor having a permanent magnet fixed to one outer periphery in the rotation axis direction. A rotating body provided with an impeller that sucks fluid from the suction port and discharges fluid from the discharge port on the other side in the rotation axis direction, and a drive that is disposed on the outer periphery of the rotor and generates a magnetic field that rotationally drives the rotor A hollow shape capable of accommodating a radial load and a thrust load of the rotating body at one of the rotor side end and the impeller side end in the rotation axis direction of the rotating body. A rotary bearing member is provided, and the case facing the other end is capable of handling a radial load and a thrust load of the rotary body, and is provided with a fixed bearing member having the same shape as the rotary bearing member.

With this configuration, the rotating body having the rotor and the impeller rotates with both ends in the rotation axis direction being supported by the fixed bearing member provided in the case and the rotating bearing member provided in the rotating body. For this reason, the shaft inserted into the rotating shaft portion is not necessary for the rotating body, and the shaft member and the bearing member for rotating and supporting the rotating body need only be provided at portions corresponding to both ends of the rotating body in the rotating shaft direction. That is, since the shaft member and the bearing member that support the rotating body can be shortened, the processed portions of the shaft member and the bearing member can be reduced as a result.
In addition, the fixed bearing member provided in the case and the rotary bearing member provided in the rotating body have the same shape and the shape corresponding to the radial load and thrust load of the rotating body, so that the parts are shared. be able to. As a result, the number of parts can be reduced and the manufacturing cost can be suppressed.

  A second characteristic configuration of the electric fluid pump of the present invention is that the rotary bearing member is provided at the impeller side end portion, and the fixed bearing member is provided in the case facing the rotor side end portion.

The rotating body is configured by providing a rotor at one end and an impeller at the other end. Among these, since a permanent magnet is fixed to the outer periphery of the rotor, the weight is considerably larger than that of the impeller. For this reason, the weight balance in the rotation axis direction of the entire rotating body is biased toward the rotor side, and the rotating body may not rotate smoothly.
However, if the case facing the rotor side end is provided with a fixed bearing member and the impeller side end is provided with a rotary bearing member as in this configuration, the rotary bearing member increases the weight on the impeller side, and the entire rotating body The degree of bias of the weight balance to the rotor is alleviated. As a result, the weight balance of the rotating body is corrected, and the rotating body rotates smoothly.

  A third characteristic configuration of the electric fluid pump according to the present invention is that the fixed bearing member is configured to support the rotating body at an outer peripheral portion.

  In the case where the fixed bearing member is provided in the case facing the rotor side end portion, if the rotor is supported by the inner peripheral portion of the fixed bearing member, the rotor side end portion is provided with the inner peripheral portion of the fixed bearing member. A projecting portion that comes into contact is formed, and the weight of the rotor is increased by the projecting portion. On the other hand, when the fixed bearing member provided in the case facing the rotor side end portion is configured to support the rotating body at the outer peripheral portion as in this configuration, the rotor side end portion contacts the outer peripheral portion of the fixed bearing member. A recess is formed, and the weight of the rotor is reduced by the recess. As a result, the weight balance of the rotating body is further corrected, and the rotating body rotates smoothly.

  A fourth characteristic configuration of the electric fluid pump of the present invention is that the sliding surfaces of the fixed bearing member and the rotary bearing member are provided on the same side of one of the outer periphery and the inner periphery.

  With this configuration, both the fixed bearing member and the rotary bearing member need only improve the processing accuracy of one sliding surface of the outer periphery and the inner periphery. As a result, the processing of the bearing member becomes easy, and the manufacturing cost can be suppressed.

Sectional drawing which shows the whole structure of the electric fluid pump which concerns on this invention The figure which shows the bearing structure of the rotary body which concerns on this invention Diagram showing the bearing structure of the impeller side end The figure which shows the bearing structure of the rotor side end The figure which shows the bearing structure of the rotary body which concerns on 2nd Embodiment. The figure which shows the bearing structure of the impeller side edge part which concerns on 2nd Embodiment. The figure which shows the bearing structure of the rotor side edge part which concerns on 2nd Embodiment. The figure which shows the bearing structure of the impeller side edge part which concerns on other embodiment. The figure which shows the bearing structure of the rotor side edge part which concerns on other embodiment. The figure which shows the bearing structure of the impeller side edge part which concerns on other embodiment. The figure which shows the bearing structure of the rotor side edge part which concerns on other embodiment.

  Hereinafter, an example in which an electric fluid pump according to the present invention is applied to an electric water pump of a vehicle will be described with reference to the drawings.

[First embodiment]
The electric water pump 1 circulates cooling water (fluid) through a cooling circuit (not shown) having, for example, a vehicle engine and a radiator. The cooling water absorbs the amount of heat generated by the engine and is warmed, and the radiator discharges the amount of heat and is cooled to cool the engine.

(General configuration of electric fluid pump)
As shown in FIG. 1, the electric water pump 1 has a water chamber (fluid chamber) 80 formed in a resin case 2, and the rotating body 10 is disposed in the water chamber 80. The rotating body 10 is provided with a rotor 11 on one side in the rotation axis direction and an impeller 12 on the other side in the rotation axis direction. A permanent magnet is fixed to the outer periphery of the rotor 11, and a drive unit 20 that generates a magnetic field for rotationally driving the rotor 11 is provided on the outer periphery side of the rotor 11. In the electric water pump 1, the rotor 11 is rotationally driven by the magnetic field generated by the drive unit 20, and the impeller 12 integrated with the rotor 11 rotates in the water chamber 80, thereby circulating cooling water in a cooling circuit (not shown). .

  The case 2 is provided with a suction port 3 for drawing cooling water into the electric water pump 1 from the direction of the rotation axis L of the rotating body 10 and a discharge port 4 for discharging the cooling water to the outside of the electric water pump 1. is there. Further, the case 2 is fixed in a watertight state by a fastening member via a seal member of the flange portion.

  As shown in FIGS. 1 and 2, the impeller 12 provided on the rotating body 10 is provided integrally with a cylindrical rotor 11. The impeller 12 includes a base portion 13 of a substantially circular plate that extends in a direction perpendicular to the rotation axis of the rotating body 10, and a plurality of blade portions 14 that are erected on the base portion 13. A magnetic member is integrally fixed to the outer periphery of the rotor 11, and further, a permanent magnet having a plurality of polarities (for example, four poles in which N and S poles are alternately arranged) is arranged on the outer periphery of the magnetic member. Is fixed. The impeller 12 rotates as the rotor 11 rotates, draws the cooling water from the suction port 3 to the water chamber 80, and discharges the cooling water from the discharge port 4 to the outside.

(Structure of impeller side end of rotating body and case facing it)
A hollow rotary bearing member 33 having a cylindrical portion 31 and a flange portion 32 is provided at the impeller side end portion 12 </ b> A of the rotating body 10. The entire rotary bearing member 33 is embedded with respect to the impeller side end portion 12 </ b> A so that the cylindrical portion 31 extends along the rotation axis direction of the rotating body 10, and the flange portion 32 is located inside the impeller side end portion 12 </ b> A with respect to the cylindrical portion 31. Located in the direction. An extending portion 2A extending from the inner wall of the case 2 toward the rotation axis L of the rotating body 10 is formed at a position facing the impeller side end portion 12A, and the rotating body 10 is formed on the extending portion 2A. The protrusion part 2a which protrudes in the direction in alignment with the rotating shaft direction is provided. In the rotary bearing member 33, the inner peripheral portion 31 </ b> A of the cylindrical portion 31 and the inner peripheral portion 32 </ b> A of the flange portion 32 are sliding surfaces with the protruding portion 2 a. That is, in the rotary bearing member 33, the inner peripheral portions 31 </ b> A and 32 </ b> A function as bearing portions corresponding to the radial load of the rotating body 10. Further, the end surface 31B of the cylindrical portion 31 facing the case 2 functions as a bearing portion corresponding to the thrust load of the rotating body 10. Note that the cooling water in the suction port 3 is drawn into the water chamber 80 through a flow path formed around the extending portion 2A.

(Structure of rotor side end of rotating body and case facing this)
The rotor-side end portion 11A of the rotating body 10 is not provided with a rotary bearing member. The case 2 facing the rotor-side end portion 11A has a cylindrical portion 34 and a flange portion 35, and is the same as the rotary bearing member 33. A fixed bearing member 36 having a shape is provided. The entire fixed bearing member 36 is embedded with respect to the case 2 such that the cylindrical portion 34 is along the rotation axis direction of the rotating body 10, and the flange portion 35 is located inward of the case 2 with respect to the cylindrical portion 34. 11 A of rotor side edge parts are provided with the protrusion part 11a which protrudes in the direction in alignment with the rotating shaft direction of the rotary body 10. As shown in FIG. In the fixed bearing member 36, the inner peripheral portion 34 </ b> A of the cylindrical portion 34 and the inner peripheral portion 35 </ b> A of the flange portion 35 are sliding surfaces with the protruding portion 11 a. That is, in the fixed bearing member 36, the inner peripheral portions 34 </ b> A and 35 </ b> A function as bearing portions corresponding to the radial load of the rotating body 10. Further, the end surface 34B of the cylindrical portion 34 facing the rotor-side end portion 11A functions as a bearing portion corresponding to the load in the thrust direction of the rotating body 10.

The operation of the electric water pump 1 will be described below.
When the drive unit 20 is energized by an external signal through an energization control unit (not shown) that controls energization, a permanent magnet having a plurality of magnetic poles in the circumferential direction rotates. Along with this, the rotor 11 to which the permanent magnet is fixed rotates, and the entire rotating body 10 including the impeller 12 rotates. Thus, when the impeller 12 rotates, the cooling water is drawn into the water chamber 80 from the suction port 3, and the cooling water is discharged from the discharge port 4 to the outside.

  The rotating body 10 having the rotor 11 and the impeller 12 is supported at both ends in the rotation axis direction by the rotating bearing member 33 provided at the impeller side end 12A and the fixed bearing member 36 provided on the inner surface of the case 2. Rotate. For this reason, the rotating body 10 does not require a shaft that is inserted into the rotating shaft portion, and the bearings that support the rotating body 10 only need to be provided at portions corresponding to both ends of the rotating body 10 in the rotating shaft direction. That is, the bearing portion that supports the rotating body 10 is shortened, and as a result, the processed portion of the bearing portion can be reduced.

  Further, the rotary bearing member 33 provided in the rotating body 10 and the fixed bearing member 36 provided in the case 2 have the same shape and a shape corresponding to the radial load and the thrust load of the rotating body 10. Can be shared. As a result, the number of parts can be reduced and the manufacturing cost can be suppressed.

  Since a permanent magnet is fixed to the outer periphery of the rotor 11 of the rotating body 10, the weight is considerably larger than that of the impeller 12. For this reason, the weight balance in the rotation axis direction of the entire rotating body 10 is biased toward the rotor 11 side, and the rotating body 10 may not rotate smoothly. However, if the rotor-side end portion 11A is not provided with the rotary bearing member 33 and only the impeller-side end portion 12A is provided with the rotary bearing member 33 as in the present embodiment, the weight of the rotary bearing member 33 is on the impeller 12 side. In addition, the degree of deviation of the weight balance of the entire rotating body 10 toward the rotor 11 is reduced. As a result, the weight balance of the rotating body 10 is corrected, and the rotating body 10 rotates smoothly.

  As for the structure of the rotary bearing member 33 provided at the impeller side end portion 12A and the case 2 facing the impeller side end portion 12A, the cylindrical portion 31 of the rotary bearing member 33 is arranged on the impeller side as shown in FIG. It may be arranged in a state of being exposed from the end portion 12 </ b> A, and the recessed portion 2 b where the outer peripheral portion 31 </ b> C of the cylindrical portion 31 is inscribed in the extended portion 2 </ b> A of the case 2 may be formed.

  Further, as shown in FIG. 3B, the flange portion 32 of the rotary bearing member 33 is disposed in a state exposed from the impeller side end portion 12 </ b> A, and the inner periphery of the rotary bearing member 33 is disposed on the extension portion 2 </ b> A of the case 2. You may form the protrusion part 2a which touches part 32A, 31A. In addition, as shown in FIG.3 (c), you may arrange | position the collar part 32 of the rotary bearing member 33 on the end surface of 12 A of impeller side edge parts on the same plane.

  With respect to the structure of the rotor-side end 11A and the fixed bearing member 36 provided in the case 2 facing the rotor-side end 11A, as shown in FIG. The recessed portion 11b in which the outer peripheral portion 34C of the cylindrical portion 34 is inscribed may be formed in the rotor-side end portion 11A. Temporarily, if it comprises so that the rotary body 10 may be bearing by the inner peripheral part 34A of the fixed bearing member 36, the protrusion part 11a which contact | connects the inner peripheral part 34A of the fixed bearing member 36 will be formed in the rotor side edge part 11A, The weight of the rotor 11 is increased by the protrusion 11a. On the other hand, when the fixed bearing member 36 provided in the case 2 facing the rotor side end portion 11A is configured to support the rotating body 10 at the outer peripheral portion 34C as in this configuration, the rotor side end portion 11A is fixed to the rotor side end portion 11A. A recess 11b that contacts the outer peripheral portion 34C of the bearing member 36 is formed, and the weight of the rotor 11 is reduced by the recess 11b. As a result, the weight balance of the rotating body 10 is further corrected, and the rotating body 10 can be smoothly rotated.

  4B, the flange portion 35 of the fixed bearing member 36 is disposed so as to be exposed from the case 2, and the inner peripheral portions 35A and 34A of the fixed bearing member 36 are disposed on the rotor side end portion 11A. You may form the protrusion part 11a which touches. In addition, as shown in FIG. 4C, the flange portion 35 of the fixed bearing member 36 may be arranged flush with the inner surface of the case 2.

  For example, as shown in FIG. 2, when the sliding surfaces of the rotary bearing member 33 and the fixed bearing member 36 are both on the inner periphery on the same side, or as shown in FIGS. 3 (a) and 4 (a). When the sliding surfaces of the rotary bearing member 33 and the fixed bearing member 36 are the same outer periphery, according to this configuration, the rotary bearing member 33 and the fixed bearing member 36 are either one of the outer periphery and the inner periphery. It is only necessary to improve the processing accuracy of the sliding surface on the side. As a result, the rotary bearing member 33 and the fixed bearing member 36 can be easily processed, and the manufacturing cost can be suppressed.

[Second Embodiment]
In the present embodiment, as shown in FIG. 5, the case 2 facing the impeller side end portion 12 </ b> A of the rotating body 10 includes the fixed bearing member 36, and the rotating bearing member 33 is provided on the rotor side end portion 11 </ b> A of the rotating body 10. Prepare.

(Structure of impeller side end of rotating body and case facing it)
The impeller side end portion 12A of the rotating body 10 is not provided with a rotary bearing member, and has a cylindrical portion 34 and a flange portion 35 on the extension portion 2A of the case 2 facing the impeller side end portion 12A. A fixed bearing member 36 having the same shape as the bearing member 33 is provided. The entire fixed bearing member 36 is embedded in the extending portion 2A of the case 2 so that the cylindrical portion 34 is along the rotational axis direction of the rotating body 10, and the flange portion 35 is located inward of the case 2 rather than the cylindrical portion 34. Located in. The impeller side end portion 12 </ b> A is provided with a protruding portion 12 a that protrudes in a direction along the rotation axis direction of the rotating body 10. In the fixed bearing member 36, the inner peripheral portion 34 </ b> A of the cylindrical portion 34 and the inner peripheral portion 35 </ b> A of the flange portion 35 serve as sliding surfaces with the protruding portion 12 a. That is, in the fixed bearing member 36, the inner peripheral portions 34 </ b> A and 35 </ b> A function as bearing portions corresponding to the radial load of the rotating body 10. In addition, the end surface 34 </ b> B facing the impeller side end portion 12 </ b> A of the cylindrical portion 34 functions as a bearing portion corresponding to the load in the thrust direction of the rotating body 10. Note that the cooling water in the suction port 3 is drawn into the water chamber 80 through a flow path formed around the extending portion 2A.

(Structure of rotor side end of rotating body and case facing this)
A rotor-side end portion 11 </ b> A of the rotating body 10 is provided with a hollow rotary bearing member 33 having a cylindrical portion 31 and a flange portion 32. The entire rotary bearing member 33 is embedded with respect to the rotor-side end portion 11 </ b> A so that the cylindrical portion 31 extends along the rotation axis direction of the rotating body 10, and the flange portion 32 is located inside the rotor-side end portion 11 </ b> A rather than the cylindrical portion 31. Buried in the position. The case 2 facing the rotor-side end portion 11 </ b> A is provided with a protruding portion 2 a that protrudes in a direction along the rotation axis direction of the rotating body 10. In the rotary bearing member 33, the inner peripheral portion 31 </ b> A of the cylindrical portion 31 and the inner peripheral portion 32 </ b> A of the flange portion 32 are sliding surfaces with the protruding portion 2 a. That is, in the rotary bearing member 33, the inner peripheral portions 31 </ b> A and 32 </ b> A function as bearing portions corresponding to the radial load of the rotating body 10. Further, the end surface 31B of the cylindrical portion 31 facing the case 2 functions as a bearing portion corresponding to the thrust load of the rotating body 10.

  Regarding the structure of the impeller side end portion 12A and the case 2 facing the impeller side end portion 12A, as shown in FIG. 6A, the cylindrical portion 34 of the fixed bearing member 36 is connected to the inner surface of the extension portion 2A of the case 2. The recessed portion 12b in which the outer peripheral portion 34C of the cylindrical portion 34 is inscribed may be formed in the impeller side end portion 12A.

  Further, as shown in FIG. 6B, the flange portion 35 of the fixed bearing member 36 is disposed in a state exposed from the inner surface of the extending portion 2A of the case 2, and the fixed bearing member 36 is disposed on the impeller side end portion 12A. You may form the protrusion part 12a which contact | connects inner peripheral part 35A, 34A. In addition, as shown in FIG. 6C, the flange portion 35 of the fixed bearing member 36 may be arranged flush with the inner surface of the case 2.

  As for the structure of the rotary bearing member 33 provided in the rotor side end portion 11A and the case 2 facing the rotor side end portion 11A, the cylindrical portion 31 of the rotary bearing member 33 is disposed on the rotor side as shown in FIG. The recess 2b in which the outer peripheral portion 31C of the cylindrical portion 31 is inscribed may be formed in the case 2 while being exposed from the end face of the end portion 11A.

  Further, as shown in FIG. 7B, the flange portion 32 of the rotary bearing member 33 is disposed in a state of being exposed from the rotor side end portion 11A, and the inner peripheral portions 32A and 31A of the rotary bearing member 33 are arranged in the case 2. You may form the protrusion part 2a which touches. In addition, as shown in FIG. 7C, the flange portion 32 of the rotary bearing member 33 may be arranged flush with the end surface of the rotor-side end portion 11A.

[Other embodiments]
(1) In the above-described embodiment, the example in which the rotary bearing member 33 and the fixed bearing member 36 have the cylindrical portions 31 and 34 and the flange portions 32 and 35 is shown. The rotary bearing member 33 and the fixed bearing member 36 may be configured only by the portions 31 and 34.

  In FIG. 8A, a rotary bearing member 33 composed of only the cylindrical portion 31 is embedded in the impeller side end portion 12A, and the inner surface of the extension portion 2A of the case 2 facing the impeller side end portion 12A is embedded in the inner surface of the extension portion 2A. A protruding portion 2 a that contacts the inner peripheral portion 31 </ b> A of the cylindrical portion 31 is formed. In FIG. 8B, a part of the cylindrical portion 31 is exposed from the end surface of the impeller side end portion 12A, and the inner surface of the extending portion 2A of the case 2 facing the impeller side end portion 12A is formed on the inner surface of the cylindrical portion 31. A recess 2b is formed in contact with the outer peripheral portion 31C.

  In FIG. 9A, a fixed bearing member 36 composed of only the cylindrical portion 34 is embedded in the inner surface of the case 2 facing the rotor-side end portion 11A, and the rotor-side end portion 11A includes an inner portion of the cylindrical portion 34. A protruding portion 11a in contact with the peripheral portion 34A is formed. In FIG. 9B, a part of the cylindrical portion 34 is exposed from the inner surface of the case 2, and a concave portion 11 b that is in contact with the outer peripheral portion 34 </ b> C of the cylindrical portion 34 is formed at the rotor side end portion 11 </ b> A.

  In FIG. 10A, a fixed bearing member 36 composed of only the cylindrical portion 34 is embedded in the inner surface of the extension portion 2A of the case 2 facing the impeller side end portion 12A, and the impeller side end portion 12A is embedded in the impeller side end portion 12A. A protruding portion 12 a that contacts the inner peripheral portion 34 </ b> A of the cylindrical portion 34 is formed. In FIG. 10B, a part of the cylindrical portion 34 is exposed from the inner surface of the extending portion 2A of the case 2, and the impeller side end portion 12A is formed with a concave portion 12b in contact with the outer peripheral portion 34C of the cylindrical portion 34. ing.

  In FIG. 11A, a rotary bearing member 33 composed only of the cylindrical portion 31 is embedded in the rotor-side end portion 11A, and the inner surface of the case 2 facing the rotor-side end portion 11A is formed inside the cylindrical portion 31. A protruding portion 2a that is in contact with the peripheral portion 31A is formed. In FIG. 11B, a part of the cylindrical portion 31 is exposed from the end surface of the rotor-side end portion 11A, and the inner surface of the case 2 facing the rotor-side end portion 11A is in contact with the outer peripheral portion 31C of the cylindrical portion 31. A recess 2b is formed.

(2) When the inner circumferences of the rotary bearing member 33 and the fixed bearing member 36 are sliding surfaces, only the cylindrical portions 31 and 34 may be configured as sliding surfaces. You may comprise so that both the parts 32 and 35 may become a sliding surface.

(3) With respect to the method of embedding the rotary bearing member 33 and the fixed bearing member 36 in the rotating body 10 or the case 2, the rotary bearing member 33 and the fixed bearing member 36 are embedded when integrally formed with the rotating body 10 or the case 2. Alternatively, the rotary bearing member 33 and the fixed bearing member 36 may be retrofitted and embedded after the rotary body 10 or the case 2 is formed.

  The electric fluid pump of the present invention can be widely used for various fluid pumps including a water pump.

DESCRIPTION OF SYMBOLS 1 Electric water pump 2 Case 2A Extension part 2a Protrusion part 2b Concave part 10 Rotating body 11 Rotor 11A Rotor side edge part 11a, 12a Protrusion part 11b, 12b Concave part 12 Impeller 12A Impeller side edge part 31 Cylindrical part 32 Eave part 33 Rotating bearing Member 34 Cylindrical part 35 Gutter part 36 Fixed bearing member

Claims (4)

A case forming a fluid chamber having a fluid inlet and a fluid outlet;
A rotor provided with a rotor having a permanent magnet fixed on one outer periphery in the direction of the rotation axis, and an impeller for sucking fluid from the suction port and discharging fluid from the discharge port on the other side in the rotation axis direction;
A drive unit that is disposed on an outer periphery of the rotor and generates a magnetic field that rotationally drives the rotor;
Among the rotor side end portion and the impeller side end portion in the rotation axis direction of the rotating body, a hollow rotary bearing member capable of handling the radial load and the thrust load of the rotating body is provided at one of the end portions, An electric fluid pump comprising a stationary bearing member having the same shape as the rotary bearing member, the casing facing the other end being capable of handling a radial load and a thrust load of the rotating body.   2. The electric fluid pump according to claim 1, wherein the rotary bearing member is provided at the impeller side end portion, and the fixed bearing member is provided in the case facing the rotor side end portion.   The electric fluid pump according to claim 2, wherein the fixed bearing member is configured to support the rotating body at an outer peripheral portion.   The electric fluid pump according to any one of claims 1 to 3, wherein sliding surfaces of the fixed bearing member and the rotary bearing member are provided on the same side of the outer periphery and the inner periphery.

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