JP6583463B2 - Waterproof structure of rotor for liquid pump - Google Patents

Description

  The present invention relates to a waterproof structure for a rotor for a liquid pump.

  In a liquid pump, since a rotor (a rotor core and a rotor magnet) is generally disposed in a liquid, it is necessary to waterproof the rotor against the liquid. For example, in a water pump (liquid pump) described in Patent Document 1 below, a first resin molded member and a second resin molded member are sealed and joined with a rotor magnet sandwiched therebetween. Thereby, the rotor magnet is waterproofed against the liquid.

JP 2006-325345 A

  By the way, when covering a rotor (a rotor core and a rotor magnet) with a resin molding member like the said water pump, it is necessary to ensure the thickness of a resin molding member from viewpoints of a moldability. For this reason, the space | interval between a rotor core and a stator becomes large, and the space | interval (magnetic gap) between a rotor magnet and a stator becomes large eventually. For this reason, there is a problem that the motor efficiency of the water pump is affected and the water pump is increased in size.

  On the other hand, it is conceivable to cover the rotor (rotor core and rotor magnet) with a cover made of, for example, a SUS plate material. In this case, the cover is composed of two members, and the connecting portion of these covers is sealed with a sealing material. However, with this structure, it is necessary to inspect the sealed state of the cover by injecting gas or the like into the cover. For this reason, there existed a problem of causing the cost increase of a water pump.

  An object of the present invention is to provide a waterproof structure for a rotor for a liquid pump that can reduce the gap between the rotor core and the stator while suppressing the cost increase in consideration of the above facts.

The waterproof structure of the rotor for a liquid pump according to claim 1 is configured such that an impeller is housed therein, a pump unit that pumps in liquid that flows in as the impeller rotates, and the impeller can rotate integrally with the impeller. A rotor having a rotor core formed in a cylindrical shape and having a rotor magnet disposed therein, a stator provided on a radially outer side of the rotor, and the interior of the pump unit and the rotor being accommodated. A rotor housing portion, a stator housing portion in which the stator is housed, a radially outer portion of the rotor and a SUS material, and the rotor core is fitted inside. And a cover that covers the rotor core and a radially inner portion of the rotor, and is made of a resin material, the rotor core Is coated with a state formed on the cover integrally, and a mold part which closes the open end of the cover, the inside diameter of the diameter of the through hole formed in the axial center portion of the bottom wall of said cover said rotor core The mold part has a lower flange that extends radially outward from the end of the mold body part covering the inner peripheral part of the rotor core and is formed in a substantially annular plate shape. The lower flange is formed integrally with the rotor core and the through hole of the cover so as to cover the axial end of the rotor core, and closes the through hole .

  According to the waterproof structure of the liquid pump rotor having the above-described configuration, the rotor formed in a cylindrical shape includes the rotor core and the rotor magnet, and the rotor magnet is disposed inside the rotor core. The rotor is configured to be able to rotate integrally with the impeller, and is accommodated in a rotor accommodating portion of a housing communicated with the inside of the pump portion. On the other hand, a stator is provided on the radially outer side of the rotor, and the stator is accommodated in a stator accommodating portion of the housing.

  Here, the radially outer portion of the rotor is constituted by a cover made of SUS material, and the rotor core is covered by the cover. Thereby, by comprising a cover by the plate material of SUS, while preventing the rust which generate | occur | produces in a cover, the space | interval between a rotor core and a stator can be narrowed.

  Further, the radially inner portion of the rotor is constituted by a mold part made of a resin material, and the mold part is formed integrally with the cover while covering the rotor core. Thereby, since the rotor core is covered with the mold part and the cover, the rotor core and the rotor magnet are waterproofed against the liquid by the mold part and the cover. In addition, since the mold part is formed integrally with the cover, it is not necessary to seal the joint between the mold part and the cover with a sealing material or the like. Thereby, the cost increase of a liquid pump can be suppressed.

  The water pump rotor waterproof structure according to claim 2 is the liquid pump rotor waterproof structure according to claim 1, wherein at least one surface of the rotor core and the rotor magnet is plated or resin-coated. Is given.

  According to the waterproof structure for a rotor for a liquid pump having the above-described configuration, even if a liquid enters the inside of the cover and the mold, the rotor core or the rotor magnet subjected to the plating process or the resin coating process can be rust-prevented.

  The liquid pump rotor waterproof structure according to claim 3 is the liquid pump rotor waterproof structure according to claim 1 or 2, wherein the impeller is formed integrally with the mold portion.

  According to the waterproof structure of the rotor for a liquid pump having the above configuration, since the impeller is integrally formed with the mold portion, the impeller and the rotor can be integrally rotated with a simple configuration while covering the rotor core with the mold portion. .

It is a longitudinal cross-sectional view of the rotor and impeller to which the waterproof structure of the rotor for liquid pumps concerning this Embodiment was applied. It is a longitudinal cross-sectional view which shows the whole water pump using the rotor shown by FIG. FIG. 3 is a plan sectional view (sectional view taken along line 3-3 in FIG. 1) of the rotor shown in FIG.

  Hereinafter, the water pump 10 as a “liquid pump” including the rotor 62 to which the waterproof structure S for a liquid pump rotor according to the present embodiment is applied will be described with reference to the drawings.

  The water pump 10 according to the present embodiment is used as a pump for pumping cooling water (liquid) for an air conditioner heater of a vehicle (automobile), for example. As shown in FIG. 2, the water pump 10 includes a pump unit 12 that accommodates the impeller 70 and pumps cooling water, and a motor unit 60 that rotates the impeller 70. Further, the water pump 10 includes a motor housing 30 as a “housing” that accommodates the motor unit 60, and a circuit device 90 for driving and controlling the motor unit 60.

  Hereinafter, each said structure is demonstrated in order of the pump part 12, the motor housing 30, the motor part 60, and the circuit apparatus 90. FIG. The water pump 10 is formed in a substantially cylindrical shape as a whole, and in the following description, the arrow A direction (one side in the axial direction of the water pump 10) appropriately shown in the drawings is the upper side, and the arrow B direction is the lower side. It is said.

(About the pump unit 12)

  As shown in FIG. 2, the pump unit 12 constitutes the upper part of the water pump 10. The pump unit 12 includes a pump case 14, and the pump case 14 constitutes an outer peripheral portion of the pump unit 12. The pump case 14 has a case main body portion 16, and the case main body portion 16 is formed in a substantially bottomed cylindrical shape opened downward. An impeller accommodating portion 18 that accommodates the impeller 70 is formed in the center portion of the case body portion 16, and the impeller accommodating portion 18 is formed in a substantially concave shape that is opened downward. Further, a flow path 20 is formed inside the case main body portion 16 on the radially outer side of the case main body portion 16 with respect to the impeller housing portion 18. The flow path 20 is formed in a substantially U-shaped cross section that is open downward, and extends along the circumferential direction of the case body 16.

  In addition, an inlet pipe 22 is integrally formed on the upper wall of the case main body 16 at the center (the axial center of the water pump 10). The inlet pipe 22 is formed in a tubular shape and extends upward from the case body 16. Further, the inlet pipe 22 communicates with the impeller accommodating portion 18 so that cooling water flows from the inlet pipe 22 into the case main body portion 16.

  Further, an outlet pipe (not shown) is integrally formed on the outer peripheral portion of the case main body 16. The outlet pipe is formed in a tubular shape and extends from the side wall of the case main body 16 in a direction orthogonal to the axis of the water pump 10. The outlet pipe communicates with the flow path 20 so that the cooling water that has flowed into the case body 16 flows out of the outlet pipe.

  A pump-side flange portion 26 is integrally formed at the open end portion of the case body portion 16, and the pump-side flange portion 26 projects from the case body portion 16 to the outside in the radial direction of the case body portion 16. At the same time, it is formed in a substantially ring shape over the entire circumference of the case body 16. A substantially cylindrical rib 26A is erected on the lower surface of the pump-side flange portion 26. The rib 26A is formed over the entire circumference of the case main body portion 16, and extends downward from the pump-side flange portion 26. It is protruding.

(About motor housing 30)

  The motor housing 30 constitutes an intermediate portion in the vertical direction of the water pump 10 and is disposed on the lower side with respect to the pump portion 12. The motor housing 30 is formed in a substantially bottomed cylindrical shape that is opened downward as a whole, and is arranged coaxially with the inlet pipe 22 (the axis of the water pump 10). Specifically, the motor housing 30 has an outer cylindrical portion 32 that constitutes a radially outer portion of the motor housing 30, and the outer cylindrical portion 32 is formed in a substantially bottomed cylindrical shape that is opened downward. ing. Further, the motor housing 30 has an inner cylinder portion 34 that constitutes a radially inner portion of the motor housing 30. The inner cylinder part 34 is formed in a substantially bottomed cylindrical shape opened upward, and the open end (upper end) of the inner cylinder part 34 is coupled to the bottom wall of the outer cylinder part 32.

  A space between the outer cylindrical portion 32 and the inner cylindrical portion 34 is a stator accommodating portion 36 for accommodating a stator 80 described later, and the stator accommodating portion 36 is a substantially annular shape opened downward. It is formed in the space. Furthermore, a space inside the inner cylinder portion 34 is a rotor accommodating portion 38 for accommodating a rotor 62 described later.

  A first coupling portion 40 is integrally formed at the upper end portion of the outer cylinder wall 32 </ b> A constituting the outer peripheral portion of the outer cylinder portion 32. The first coupling portion 40 protrudes from the outer cylinder wall 32A to the outside in the radial direction of the motor housing 30, is formed in a substantially ring shape over the entire circumference of the outer cylinder wall 32A, and the pump-side flange portion 26 described above. They are arranged facing each other in the vertical direction. Further, a rib housing recess 40A is formed on the upper surface of the first coupling portion 40 at a position corresponding to the rib 26A of the pump-side flange portion 26 described above. 40 A of rib accommodating recessed parts are open | released upwards, and are formed in the annular | circular shape (ring shape) seeing from the axial direction of the motor housing 30. As shown in FIG. And the 1st coupling | bond part 40 and the pump side flange part 26 are couple | bonded in the state in which the rib 26A of the pump case 14 was accommodated in the rib accommodating recessed part 40A. Further, in this state, the bottom wall of the outer cylindrical portion 32 enters the pump case 14 and the pump case 14 and the rotor accommodating portion 38 are communicated with each other.

  On the other hand, a second coupling portion 42 is integrally formed at the lower end portion of the outer cylindrical wall 32A. The second coupling portion 42 projects from the outer cylinder wall 32A to the outside in the radial direction of the motor housing 30, and is formed in a predetermined shape over the entire circumference of the outer cylinder wall 32A. Further, an encircling wall 42 </ b> A is integrally formed on the lower surface of the second coupling portion 42 at the outer peripheral portion of the second coupling portion 42. The surrounding wall 42 </ b> A protrudes downward from the second coupling portion 42 and is formed in a frame shape over the entire circumference of the second coupling portion 42.

  Further, the second coupling portion 42 is integrally formed with a connector portion (not shown) that is fitted with an external connector (not shown). The connector portion is formed in a substantially bottomed rectangular tube shape that is opened downward, and protrudes downward from the second coupling portion 42. Although not shown, the motor housing 30 is provided with a connector terminal connected to an external connector, and one end portion of the connector terminal is disposed inside the connector portion. Further, the connector terminal is bent into a predetermined shape, and the other end of the connector terminal extends downward from the motor housing 30 and is connected to a circuit board 96 described later.

  Further, a substantially cylindrical support portion 48 is integrally formed on the bottom wall of the inner cylinder portion 34 at the center portion. The support portion 48 is disposed coaxially with the inlet pipe 22 of the pump portion 12 and protrudes upward from the bottom wall of the inner cylinder portion 34. Furthermore, a cylindrical rotary shaft 50 is provided in the inner cylinder portion 34, and the rotary shaft 50 is disposed coaxially with the support portion 48. The lower end portion of the rotation shaft 50 is fixedly supported by the support portion 48, and the rotation shaft 50 protrudes upward from the support portion 48.

(About the motor unit 60)

  As shown in FIG. 2, the motor unit 60 includes a rotor 62 and a stator 80. Hereinafter, the rotor 62 will be described first, and then the stator 80 will be described.

  The rotor 62 is formed in a substantially cylindrical shape as a whole and is accommodated in the rotor accommodating portion 38 of the motor housing 30 on the radially outer side of the rotating shaft 50. 1 and 3, the rotor 62 includes a rotor core 63, a rotor magnet 64, a rotor cover 65 as a “cover”, and a mold portion 66. And the waterproof structure S of the rotor for liquid pumps which is the principal part of this invention is applied to the rotor 62. FIG.

  The rotor core 63 is composed of a plurality of steel plates punched in a substantially annular shape, and each steel plate is laminated with the plate thickness direction being the axial direction of the rotary shaft 50. The rotor core 63 has a plurality of (in this embodiment, four) holes 63 </ b> A penetratingly formed in the axial direction of the rotor core 63, and the holes 63 </ b> A are equally spaced along the circumferential direction of the rotor core 63 (90 (Every degree). The hole 63A is formed in a substantially rectangular cross section, and the rotor magnet 64 is inserted into the hole 63A. The rotor magnet 64 is configured as a neodymium magnet. The surfaces of the rotor core 63 and the rotor magnet 64 are each subjected to rust prevention treatment (for example, nickel plating or resin coating). Thereby, the corrosion prevention and rust prevention of the rotor core 63 and the rotor magnet 64 are enhanced.

  The rotor cover 65 constitutes a radially outer portion of the rotor 62 and is formed in a substantially bottomed cylindrical shape opened upward. The rotor cover 65 is made of a SUS plate (plate thickness: 0.25 mm). A rotor core 63 is fitted in the rotor cover 65. A through hole 65 </ b> A (see FIG. 1) is formed in the bottom wall of the rotor cover 65, and the diameter dimension of the through hole 65 </ b> A is set larger than the inner diameter dimension of the rotor core 63.

  The mold part 66 constitutes a radially inner part of the rotor 62. The mold part 66 has a substantially cylindrical mold main body part 66 </ b> A, and the mold main body part 66 </ b> A is formed integrally with the rotor core 63 so as to cover the inner peripheral portion of the rotor core 63. As shown in FIG. 1, the mold part 66 has an upper flange 66B and a lower flange 66C. The upper flange 66B and the lower flange 66C extend outward in the radial direction from the upper and lower ends of the mold main body portion 66A, respectively, and are formed in a substantially annular plate shape. The upper flange 66B and the lower flange 66C are formed integrally with the rotor core 63 so as to cover both axial ends of the rotor core 63. Further, the upper flange 66 </ b> B is formed integrally with the open end of the rotor cover 65 and closes the open end of the rotor cover 65. The lower flange 66C is formed integrally with the through hole 65A of the rotor cover 65 and closes the through hole 65A of the rotor cover 65. Thereby, the rotor core 63 and the rotor magnet 64 are covered with the rotor cover 65 and the mold part 66 in a state where the liquid tightness of the joint part between the rotor cover 65 and the mold part 66 is ensured.

  Further, a bearing 67 formed in a substantially cylindrical shape is integrally provided on the radially inner side of the mold main body portion 66A. The bearing 67 is coaxially disposed on the rotary shaft 50 and is rotatably supported by the rotary shaft 50 (see FIGS. 2 and 3). As a result, the rotor 62 is rotated about the axis of the rotary shaft 50 via the bearing 67.

  On the other hand, a connecting shaft portion 68 for connecting the impeller 70 and the mold portion 66 is integrally formed on the upper side of the mold portion 66. The connecting shaft portion 68 is formed in a substantially cylindrical shape, is disposed coaxially with the rotating shaft 50, and extends upward from the upper flange 66 </ b> B of the mold portion 66.

  A first disk portion 72 and a blade 74 constituting the impeller 70 are integrally formed at the upper end of the connecting shaft portion 68. The first disk portion 72 is formed in a substantially disk shape, and is arranged coaxially with the rotation shaft 50 with the plate thickness direction being the axial direction of the rotation shaft 50. The blade 74 projects upward from the first disk portion 72. Further, on the upper side of the blade 74, a second disk portion 76 constituting the impeller 70 is provided. The second disk portion 76 is formed in a substantially disk shape, is disposed so as to face the first disk portion 72 via the blade 74, and is integrally coupled to the blade 74.

  Next, the stator 80 will be described. As shown in FIG. 2, the stator 80 includes a stator core 82 formed in an annular shape and a winding 84 having conductivity, and is accommodated in the stator accommodating portion 36 of the motor housing 30. Yes. The stator core 82 is composed of a plurality of steel plates punched into a predetermined shape, and the steel plates are stacked in the vertical direction with the plate thickness direction being the vertical direction. The stator core 82 is formed with a plurality of tooth portions 82A extending outward in the radial direction of the stator core 82.

  Winding 84 is wound around tooth portion 82 </ b> A of stator core 82. Thereby, winding part 84A wound along the outer peripheral part of teeth part 82A is formed. A terminal portion of the winding 84 extends downward from the motor housing 30 (stator accommodating portion 36) and is connected to a circuit board 96 described later. An insulating member 85 (see FIG. 2) is interposed between the winding portion 84A and the tooth portion 82A.

  The stator 80 is covered with a stator holder 86. The stator holder 86 is made of a steel plate and has a substantially bottomed cylindrical shape that is open downward. A circular arrangement hole 86 </ b> A is formed through the bottom wall of the stator holder 86 in the vertical direction. The stator 80 and the stator holder 86 are accommodated in the stator accommodating portion 36 in a state where the stator 80 is disposed in the stator holder 86. In this state, the inner cylindrical portion 34 of the motor housing 30 is disposed inside the arrangement hole 86A.

  In addition, a holder-side flange portion 86 </ b> B is integrally formed at the open end (lower end) of the stator holder 86. The holder-side flange portion 86B extends from the open end of the stator holder 86 to the outside in the radial direction of the stator holder 86, and is disposed below the second coupling portion 42 of the motor housing 30 and inside the surrounding wall 42A. ing.

(About the circuit device 90)

  The circuit device 90 constitutes a lower part of the water pump 10 and is disposed on the lower side of the motor housing 30. The circuit device 90 includes a plate unit 92, a circuit board 96, and a circuit cover 98.

  The plate unit 92 is formed in a substantially disk shape and is disposed on the lower side with respect to the motor housing 30. The plate unit 92 includes a plate main body 93 made of a resin material, and a ring plate 94 made of a steel plate and formed in a substantially ring shape. The plate main body 93 and the ring plate 94 are integrally formed with the ring plate 94 disposed above the plate main body 93.

  Further, the ring plate 94 has a plurality of fixing holes (not shown). The ring plate 94 is disposed so as to face the holder-side flange portion 86B of the stator holder 86 in the vertical direction, and a fastening member such as a screw is inserted into the fixing hole, so that the plate unit 92 becomes the holder-side flange portion. It is fastened and fixed to 86B.

  The ring plate 94 is integrally formed with a plurality of fixing pieces 94B (see FIG. 2) for fixing a circuit board 96 to be described later. The fixed piece 94 </ b> B extends downward from the outer peripheral portion of the ring plate 94, and the distal end portion of the fixed piece 94 </ b> B is bent inward in the radial direction of the ring plate 94. A burring 94C for fastening a circuit board 96, which will be described later, is formed at the distal end of the fixed piece 94B. The burring 94C is formed in a substantially bottomed cylindrical shape that is opened downward.

  Further, a guide hole (not shown) is formed in the plate unit 92 so as to penetrate in the vertical direction, and the other end portion of the connector terminal and the terminal portion of the winding 84 are inserted into the guide hole. Yes.

  The circuit board 96 is formed in a substantially disc shape, and is disposed on the lower side of the plate unit 92 with the plate thickness direction being the vertical direction. A screw (not shown) is inserted into the burring 94C of the ring plate 94 described above, and the circuit board 96 is fixed to the plate unit 92 by the screw. A plurality of circuit elements 96A are mounted on the circuit board 96, and the other end of the connector terminal and the terminal of the winding 84 are connected.

  The circuit cover 98 is made of a steel plate and is formed in a substantially bottomed cylindrical shape opened upward. Further, a cover-side flange portion 98A is integrally formed at the open end (upper end) of the circuit cover 98, and the cover-side flange portion 98A protrudes radially outward of the circuit cover 98 from the open end of the circuit cover 98. In addition, it is formed over the entire circumference of the circuit cover 98. The circuit cover 98 covers the circuit board 96 and the plate unit 92 and closes the lower end portion of the motor housing 30. Specifically, the cover-side flange portion 98A is disposed inside the vertical wall portion 42A of the motor housing 30 and opposed to the holder-side flange portion 86B of the stator holder 86, and is held by a fastening member such as a screw (not shown). It is fastened and fixed to the side flange portion 86B.

  Next, the operation and effect of the present embodiment will be described.

  In the water pump 10 configured as described above, the inside of the pump portion 12 (pump case 14) and the inside of the rotor housing portion 38 of the motor housing 30 are communicated with each other. Further, the impeller 70 is accommodated in the impeller accommodating portion 18 of the pump case 14, and the rotor 62 of the motor unit 60 is accommodated in the rotor accommodating portion 38. Further, the impeller 70 and the rotor 62 are configured to be integrally rotatable. Further, the stator 80 of the motor unit 60 is disposed on the outer side in the radial direction of the rotor 62, and the stator 80 is accommodated in the stator accommodating portion 36 of the motor housing 30.

  Then, an external connector is connected to the connector unit, and electric power for driving and controlling the motor unit 60 is supplied from the external connector to the circuit device 90. As a result, the motor unit 60 is driven, the rotor 62 of the motor unit 60 is rotated about the axis of the rotary shaft 50, and the impeller 70 is rotated about the axis of the rotary shaft 50. Then, by rotating the impeller 70, the cooling water that has flowed into the pump case 14 from the inlet pipe 22 of the pump unit 12 is pumped and flows out from the outlet pipe.

  Here, the radially outer portion of the rotor 62 is a rotor cover 65 made of a SUS plate material, and the radially outer portion of the rotor core 63 is covered by the rotor cover 65. Thereby, the space | interval (magnetic gap) between the rotor core 63 and the stator 80 can be narrowed. That is, if the rotor cover 65 is made of a resin material, it is necessary to ensure the thickness of the rotor cover 65 to 1 mm to 2 mm, for example, from the viewpoint of moldability and the like. On the other hand, the thickness of the rotor cover 65 can be set to 0.25 mm, for example, by using the rotor cover 65 as a SUS plate material. As a result, the distance (magnetic gap) between the rotor core 63 and the stator 80 can be reduced.

  In addition, the radially inner portion of the rotor 62 is a molded portion 66 made of a resin material. The molded portion 66 covers the radially outer portion of the rotor core 63 and both axial end portions of the rotor cover 65. And is integrally formed. As a result, the rotor core 63 and the rotor magnet 64 are covered by the mold part 66 and the rotor cover 65, so that the rotor core 63 and the rotor magnet 64 are waterproofed by the mold part 66 and the rotor cover 65. In addition, since the mold part 66 is formed integrally with the rotor cover 65, it is not necessary to seal the joint between the mold part 66 and the rotor cover 65 with a sealing material or the like. Thereby, the cost increase of the water pump 10 can be suppressed.

  As described above, according to the waterproof structure S for a liquid pump rotor according to the present embodiment, the interval between the rotor core 63 and the stator 80 can be narrowed while suppressing an increase in the cost of the water pump 10.

  Further, the surfaces of the rotor core 63 and the rotor magnet 64 are subjected to rust prevention treatment. For this reason, even when cooling water enters the interior of the rotor cover 65 and the mold part 66, the rotor core 63 and the rotor magnet 64 can be reliably rust-proof.

  Further, the impeller 70 is formed integrally with the mold part 66 via the connecting shaft part 68. Therefore, the impeller 70 and the rotor 62 can be integrally rotated with a simple configuration while covering the rotor core 63 with the mold portion 66.

  In the present embodiment, the surfaces of the rotor core 63 and the rotor magnet 64 are subjected to rust prevention treatment (for example, nickel plating or resin coating). However, the rust prevention of either the rotor core 63 or the rotor magnet 64 is performed. The treatment may be omitted, or both rust prevention treatments may be omitted.

  Further, the thickness of the rotor cover 65 of the present embodiment is set to 0.25 mm, but the thickness of the rotor cover 65 can be arbitrarily set.

DESCRIPTION OF SYMBOLS 10 ... Water pump (liquid pump), 12 ... Pump part, 30 ... Motor housing (housing), 36 ... Stator accommodating part, 38 ... Rotor accommodating part, 62 ... Rotor, 63 ... Rotor core, 64 ... Rotor magnet, 65 ... Rotor cover (cover), 66 ... Mold part, 70 ... Impeller, 80 ... Stator, S ... Rotor for liquid pump Waterproof structure

Claims (3)

An impeller is housed inside, and a pump unit that pumps inflowed liquid by rotating the impeller;
A rotor having a rotor core that is configured to be integrally rotatable with the impeller, formed in a cylindrical shape, and in which a rotor magnet is disposed;
A stator provided on the radially outer side of the rotor;
A housing configured to include a rotor accommodating portion that communicates with the inside of the pump portion and accommodates the rotor; and a stator accommodating portion that accommodates the stator;
A cover that constitutes a radially outer portion of the rotor, is made of SUS material, and covers the rotor core by inserting the rotor core inside,
While constituting the radially inner portion of the rotor, made of a resin material, formed integrally with the cover in a state of covering the rotor core, and a mold part closing the open end of the cover;
Equipped with a,
The diameter dimension of the through hole formed in the axial center portion of the bottom wall of the cover is set larger than the inner diameter dimension of the rotor core,
The mold part has a lower flange formed in a substantially annular plate shape, extending radially outward from an end of the mold body part covering the inner peripheral part of the rotor core,
The waterproof structure for a liquid pump rotor, wherein the lower flange is formed integrally with the through hole of the rotor core and the cover so as to cover an axial end portion of the rotor core, and closes the through hole .   The waterproof structure of a rotor for a liquid pump according to claim 1, wherein at least one surface of the rotor core and the rotor magnet is subjected to a plating process or a resin coating process.   The waterproof structure for a rotor for a liquid pump according to claim 1, wherein the impeller is integrally formed with the mold part.